78230 International Finance Corporation Success of Geothermal Wells: A global study Prepared by International Finance Corporation with input from GeothermEx, Inc. International Finance Corporation Success of Geothermal Wells: A global study June 2013 2 Success of Geothermal Wells: A Global Study About IFC IFC, a member of the World Bank Group, is the largest global development institution focused exclusively on the private sector. We help developing countries achieve sustainable growth by financing investment, mobilizing capital in international financial markets, and providing advisory services to businesses and governments. In FY12, our investments reached an all-time high of more than $20 billion, leveraging the power of the private sector to create jobs, spark innovation, and tackle the world’s most pressing development challenges. For more information, visit www.ifc.org. Disclaimer The database on which this report is based was compiled by GeothermEx, Inc. for IFC in partnership with the Government of Japan and the Global Environment Facility (GEF). The analysis in the report was led by Tom Harding-Newman (IFC), with substantial input from James Morrow (GeothermEx, Inc.) and Subir Sanyal (GeothermEx, Inc.). Regression analysis was performed by Zhengjia Meng (World Bank). Peer reviews were received from Mike Allen (Consultant, New Zealand), Patrick Avato (IFC), Magnus Gehringer (World Bank), Jeremy Levin (IFC), Victor Loksha (World Bank), Sonia Moin (IFC), Dr. Akin Oduolowu (formerly Lead Energy Specialist at the World Bank), and Alexios Pantelias (IFC). The conclusions and judgments contained in this report should not be attributed to, and do not necessarily represent, the views of IFC, its Board of Directors, the World Bank, its Executive Directors, or the countries they represent. IFC and the World Bank do not guarantee the accuracy of the data in this publication and accept no responsibility for any consequences of their use. This report does not claim to serve as an exhaustive presentation of the issues it discusses and should not be used as a basis for making commercial decisions. Please approach independent legal counsel for expert advice on all legal issues. The material in this work is protected by copyright. Copying and/or transmitting portions or all of this work may be a violation of applicable law. IFC encourages dissemination of this publication and hereby grants permission to the user of this work to copy portions of it for the user’s personal, non-commercial use. Any other copying or use of this work requires the express written permission of IFC. Copyright © 2013 International Finance Corporation 2121 Pennsylvania Ave. NW, Washington, DC 20433 United States of America A Member of the World Bank Group 3 Contents 1. Executive Summary............................................................................................... 4 2. Overview................................................................................................................ 6 2.1 Project Background.....................................................................................................................6 2.2 Aims of the Report.................................................................................................................. 7 2.3 Defining Well Success............................................................................................................. 8 2.4 Difficulties Encountered.......................................................................................................... 9 3. Overview of the Database.................................................................................. 10 3.1 Wells and Fields..................................................................................................................... 10 3.2 Geology Code....................................................................................................................... 11 3.3 Resource Code...................................................................................................................... 12 3.4 Completion Date................................................................................................................... 13 3.5 Well Status............................................................................................................................ 13 3.6 Well Capacity........................................................................................................................ 13 3.7 Well Depth............................................................................................................................ 14 3.8 Casing Size........................................................................................................................... 15 3.9 Well Success......................................................................................................................... 16 3.10 Re-drilling and Pumping...................................................................................................... 16 3.11 Exploration, Development, and Operation Wells.................................................................. 16 3.12 Excluded Fields.................................................................................................................... 16 4. presentation and analysis of results................................................................. 17 4.1 Overall Success Rate.............................................................................................................. 17 4.2 Learning Curves.................................................................................................................... 17 4.3 Variation in Success, by Project Phase.................................................................................... 19 4.4 Improvements over Time....................................................................................................... 20 4.5 Impact of Well Depth............................................................................................................ 21 4.6 Impact of Casing Size............................................................................................................ 21 4.7 Impact of Geology................................................................................................................ 22 4.8 Impact of Resource Enthalpy................................................................................................. 23 4.9 Combining Geology and Enthalpy......................................................................................... 24 4.10 Impact of Re-drilling............................................................................................................ 24 4.11 Impact of Pumping.............................................................................................................. 26 5. conclusions.......................................................................................................... 27 5.1 Key Findings.......................................................................................................................... 27 6. references and further reading......................................................................... 30 ANNEX A. geothermal fields covered in the database........................................................................... 32 ANNEX B. estimating well power capacity............................................................................................. 33 ANNEX C. analysis of impact of geology and resource types on well capacity (mwe)............................. 41 ANNEX D. Well database...................................................................................................................... 42 4 Success of Geothermal Wells: A Global Study 1. Executive Summary As at end-2011, 10,700 megawatts (MWe) of geothermal electricity generation capacity was in operation around the world. Geothermal power plants harness the earth’s heat to generate electricity. Geothermal energy is a low-carbon, reliable, renewable energy source that has been in use for over 100 years. Despite its comparatively low cost relative to other power sources, the uneven distribution of easily tapped geothermal resources around the world, combined with high upfront costs and the risks attached to locating it, have so far prevented the wider adoption of this high-potential power source. Drilling costs comprise some 35–40 percent of the total capital costs of a geothermal project – most of which will be incurred in determining the size, location, and power capacity of the geothermal resource. This investment will, of course, be lost if no resource is found. For that reason, it is crucial that project developers and financers have a clear understanding of the level of risk inherent in any specific project, in order to assess the value of such project against its cost of capital. Despite this, very little work to date has been undertaken on a global scale to assess the probability of success in the drilling of geothermal wells, or on the factors that influence this probability. All previous studies on geothermal drilling risk have focused on examples taken from a very limited set of projects, making it difficult to draw conclusions that can be applied to the industry more widely. To address this IFC has, for the first time, developed a global database of wells in geothermal fields which together supply power to 71 percent of the world’s installed geothermal electricity generating capacity, making it the largest database of its kind. This report analyzes that data to gain a better understanding of the probability of drilling a successful well, and the factors that influence such success. This database has been compiled from both publicly available sources as well as confidential information from individual geothermal developers that has been shared with GeothermEx, Inc. over the past four decades. Covering a total 2,613 wells, it includes the following information: (a) completion date; (b) initial and current status; (c) power capacity (MWe); (d) depth; (e) geology type; (f) resource type (temperature/enthalpy); (g) well casing size; 5 (h) success of the well; (i) whether a pump is used on the well; and (j) whether the well has been re-drilled. There are no universally accepted criteria for defining what constitutes a successful geothermal well. For the purposes of this report, success is defined mainly on the basis of a well’s power-generating capacity (MWe), since data on other factors influencing success (including the economics of individual wells) were not universally available. The key finding of this report is that overall, for those wells for which status could be verified, 78 percent of wells drilled were successful. In two thirds of the fields in the database, more than 60 percent of wells were successful. Although the data did not reveal any basis on which forecasting success in the Exploration Phase of a project could be guaranteed, average success rates in this phase have been improving over the last several decades. This may be related to improving technologies and techniques in geothermal surveys, resulting in more accurate targeting of exploration wells: which would suggest that adherence to international best practice during the exploration phase can make a significant contribution to reducing exploration risks.1 There does appear to be a strong learning-curve effect in geothermal drilling, as each resource is developed. While the rate of success for the first well drilled in a field appears to average 50 percent, the success rate averaged over the first five wells drilled is 59 percent. This rises to 74 percent during the Development Phase, increasing to 83 percent for wells drilled during the Operation Phase. The geology of the resource also appears to affect the success of a well, with fields in a sedimentary basin, in which drilling is above the basement, having the highest success rates. Sixteen percent of the wells analyzed in this report had been re-drilled. The average success of such wells was shown to be higher (at 87 percent) than for original wells (77 percent). Neither the enthalpy of the resource, the casing size, nor the use of pumping appear to affect success. Well depth does not, either, appear to have any bearing on a well’s success. The average capacity of the wells analyzed in this report is 7.3 MWe. However, the modal average well capacity is three MWe, reflecting the considerable variation in capacity across all wells studied: the maximum capacity of any single well in the database is recorded at 52 MWe. A well’s maximum capacity increases in correlation with the enthalpy of the resource. The combination of enthalpy and resource type contributes about 11 percent of the variation in capacity, and it is therefore crucial that these characteristics are fully assessed before drilling starts. No other factor appears to have a clear impact on the likely capacity of a well. The uniqueness of individual geothermal projects, and the uncertainty inherent in the development of new fields, make it difficult to translate findings from one field to another. Any risk assessment of a new project must be based on current international best practice in the conduct of all project surveys, as well as thorough analysis of data gained from the project site. Nonetheless, this report highlights several interesting findings that could be usefully applied by developers of geothermal projects, and their financers. 1 Geothermal Exploration Best Practices: A Guide to Resource Data Collection, Analysis, and Presentation for Geothermal Projects, IGA Service GmbH, (2013). Available at: http://www.geothermal-energy.org/ifc-iga_launch_ event_best_practice_guide.html. 6 Success of Geothermal Wells: A Global Study 2. Overview 2.1 Project Background Geothermal energy is a low-operating-cost, low-carbon, base-load, renewable energy resource that has been exploited for electric power production for more than a century. As at end-2011, the world’s total installed geothermal electric power generation capacity stood at more than 10,700 MWe and, despite a considerably lower public profile, in 2010 produced twice the electricity output of solar sources.2 By its very nature, geothermal power offers a steady base-load source of electricity, not subject to the intermittent nature and risks of most other renewable energy sources such as solar or wind. Geothermal energy is currently used for electricity generation in 24 countries worldwide; many more countries use lower-temperature geothermal sources for heating applications. The focus of this report, and the database on which it is based, is geothermal power for the generation of electricity. Geothermal plants generate electricity by extracting energy from the flow of steam through a conventional turbine, or by using geothermal fluids to heat a secondary fluid that drives a turbine in a binary cycle. High-temperature geothermal fluids are produced from aquifers located in geological formations that are heated by natural processes within the earth’s core. Since drilling is expensive, it is most economical to extract this energy from those geothermal reservoirs closest to the surface, typically in areas of prior (or recent) volcanic activity. Most geothermal power-plant developments are therefore located close to tectonic plate boundaries such as the Pacific Rim, the East Africa Rift Valley, and the Mid-Atlantic Ridge. Geothermal fluids are extracted through wells drilled into the geothermal reservoir (or “resourceâ€?): these wells are then connected to a power facility. In order to prevent the resource from becoming depleted (and to mitigate possible environmental impacts from the discharge of waste fluids), such geothermal fluids are usually re-injected into the reservoir through additional wells (“injection wellsâ€?). As demonstrated in this report, the depths of wells can vary greatly, and can extend to several kilometers. Drilling to such depths incurs significant costs: drilling costs comprise some 35–40 percent of the total capital costs of a geothermal project, and increase exponentially with depth. A single well may cost between $1–7 million, depending on the depth of the well and the local conditions. A significant proportion of the cost of well drilling may need to be committed before the characteristics of the resource are fully determined, requiring the project developer to either self-finance this high-risk phase of development or to source funding from outside agencies in a position to bear such risk. 2 World Energy Outlook 2010, International Energy Agency, (2010). Available at: http://www.iea.org/publications/ freepublications/publication/weo2010.pdf. 7 Geothermal fields often exhibit highly disparate and diverse characteristics, both between different fields and, indeed, within the same field. Wells are typically targeted to reach a particular area within a geothermal reservoir since variations in geology, the properties of resource fluids, subsurface temperatures and pressures, as well as the presence of fractured formations, can significantly affect the quality and quantity of production. In order to accurately target a well a project developer must carry out systematic analysis of the resource through the application of both above-ground and below-ground surveying techniques. Above-ground techniques may include magnetic, resistivity, and gravity surveys, as well as geochemical and geological analysis, while below-ground techniques may involve temperature gradient and/or slim-bore drilling. Such investigations allow the progressive construction of a comprehensive reservoir model, essential to the accurate targeting of production wells and subsequent location of reinjection wells to ensure that resource development is optimized for long-term, sustainable production. The costs incurred in carrying out such pre-drilling activities are not insignificant (typically in the order of $1–9 million) but are considerably less than the costs of mounting an exploratory or confirmation deep-drilling program. Even where extensive surveys are carried out, there is always a risk that the results from full- bore, full-depth drilling will not match expectations. While this can, of course, impact the commercial viability of a project, experienced developers will fully evaluate such risks before drilling is undertaken. While only one element of a project’s ultimate success, the drilling of geothermal wells is critical to the success of any geothermal project. This report addresses only those factors that determine the ultimate success of a geothermal well (the methodology used to define a successful well is discussed in section 2.3, below). Despite the importance of successful well drilling to the long-term viability of any geothermal project, very little work has, to date, been undertaken on a global level to determine the probability of drilling successful wells, or on the factors that impact this probability. Forecasting the degree of such risk in any specific project is generally a matter of in-house information, speculation, or an educated guess, based on empirical data from individual projects. This report represents the first attempt to develop a single empirical database on geothermal wells, to address these shortfalls in market knowledge. Disparate databases are available from various countries, but there is usually no way of confirming whether the data therein covers all wells drilled within a field. The most significant resources on the analysis of geothermal resource risk are listed in section 6, below. Such research as has been released focuses on the analysis of individual fields (notably the Kamojang field, Indonesia; The Geysers, United States; and the Molasse Basin, Germany), or on the presentation of a theoretical framework for analysis. The limited scope and scale of such works makes strong conclusions difficult to reach. The database on which this report is based has been compiled from both publicly available sources as well as confidential information obtained by GeothermEx, Inc. over the past four decades. 2.2 Aims of the Report The core objective of this project was to develop a sufficiently large database to allow statistically significant conclusions to be drawn on the success rates of geothermal wells worldwide (expressed as the number of successful wells developed as a proportion of total wells drilled in any given field). This report determines and analyzes that overall success rate, as well as those factors that potentially affect success – including geology, resource enthalpy, and well depth. It seeks to assess the extent of any improvements in well success rates, and how far the likelihood of success increases as a developer learns more about any specific 8 Success of Geothermal Wells: A Global Study resource. Since the success of a well is usually determined by its power capacity (MWe), this report also analyzes the power capacity of geothermal wells drilled and the factors affecting such capacity. This report is targeted at those with an interest in the risks pertaining to geothermal wells, and the subsequent probability of success. The information contained herein will be of interest to geothermal developers, and to financers engaged in the risk assessment of such projects. This report, and the database and analysis on which it is based, may be used by stakeholders in the geothermal industry investigating the range of success rates seen in geothermal projects around the world, and the factors that influence such variation. Such quantification of the risks inherent in geothermal projects will allow investors and operators to develop better models for the assessment of investment priorities. However, every geothermal project exhibits its own unique characteristics and the value of any qualitative and quantitative data in the database will, inevitably, have its limits. Any analysis of the success rate of geothermal wells can, therefore, only be informative rather than instructive. 2.3 Defining Well Success For those wells for which capacity was either available or estimated, a well was deemed to have been successful only where the capacity was above a certain threshold. In most cases, this threshold was three MWe or higher. The threshold was lower in some fields where data indicated that wells with a lower capacity were still connected to power plants. In those instances where a well exhibited a history of successful supply to a power plant, such wells were deemed to be successful whether or not an estimation of the capacity was possible, since such fact of supply would, itself, indicate a successful well. Likewise, injection wells that have been active for a long time were deemed to be successful wells, since a genuinely unsuccessful well would be unlikely to be used as an injection well in the long term. However, an injection well might represent an unsuccessful production well that has been subsequently reworked, and in such cases it is possible that the drilling success rate may have been overestimated. On balance, however, this assumption is felt to be better than other alternatives for estimating a drilling success rate. Pumped wells were also deemed to be successful. In geothermal fields, a “dry holeâ€? is a rarity. Almost all geothermal wells flow to some extent, and only 10 wells in the database are marked as dry. However, a geothermal well may be deemed unsuccessful for one or more reasons – for example if: (a) unexpected mechanical problems are encountered during drilling, and the well is partly filled or bridged by drill cutting and/or casing collapse; (b) it has an inadequate temperature; (c) it has too low a static pressure; (d) it encounters a reservoir that is too “tightâ€? (i.e., the Productivity Index (PI) is low); or (e) it has unacceptable chemical problems (such as gassy, corrosive, or scaling-prone fluids). Success also depends, in part, on the difference between a well’s intended use prior to drilling, and what the characteristics of such drilled well allow. For example, a well intended for production could instead be used for injection, and could be deemed successful for that purpose. As well as exhibiting the right physical characteristics, a well must also be economically successful. In addition to the costs of pumping and drilling, the costs of building, operating, and maintaining the attached power plant must also be taken in to account, as well as the 9 price of the electricity sold. A two-MWe or three-MWe (net) well may be commercially successful if it is, for example, a relatively shallow well costing in the order of $1 million, but such a well may be uneconomic if it is a deep well costing several million dollars. Equally, a two-MWe or three-MWe well at a relatively shallow depth might be considered successful at an electricity price of $100/MWh, but represents a grim prospect at a price of $60/MWh. Effectively, a well’s success should be determined on the basis of its return on investment (ROI): however, since the database on which this report is based does not include cost data this has not been directly considered in determining well success. The success rate is defined as the number of successful wells as a proportion of the total number of wells drilled. Throughout this report, the success rate of wells is averaged across all relevant fields in the database, while the success of fields is averaged across all development wells (unless otherwise stated). The use of the word “rateâ€? in this report makes no reference to the speed of drilling a well (the database does not cover this aspect of drilling). 2.4 Difficulties Encountered A number of unforeseen difficulties were encountered in conducting this project. 1) There is no universal basis for defining the success of a geothermal well (see section 2.3, above). 2) For many wells, information on power capacity was not directly available. It should be noted that a well’s power capacity cannot be directly measured in terms of megawatts (MW) but is derived from the measured production rate and enthalpy (“heat contentâ€?) of the produced fluid for a given power conversion scheme. Therefore, the power capacity discussed in this report is based on a calculated electrical power output, “MWeâ€?. The basis for such calculations is shown in Annex B, below. It should also be noted that the capacity of a well may change over time: unless otherwise stated, the capacities cited in this report are typically those initially produced by the well in question. Power capacity could confidently be verified for 1,087 of 2,613 wells analyzed. 3) Of the 57 fields in the database, only seven had fewer than 10 wells. This suggests that the database is weighted towards larger projects sufficiently successful in the Exploration Phase to warrant progression to the Development Phase. The accuracy of this report is therefore limited with regard to any risk assessment of the Exploration Phase, or of small projects with only a few wells. Additionally, every field in this database showed some successful wells, suggesting that fields that were abandoned after a few unsuccessful wells are not represented. This is likely to skew the results of this analysis towards higher success rates, though the effect should be small as, anecdotally, this is a rare occurrence. 4) As shown in this analysis, the presence of prior wells in a field significantly increases the chances of the ultimate success of subsequent wells. In some cases, wells may have been drilled prior to geothermal development, either for the purposes of oil and gas exploration, or by government research bodies not focused on the identification of geothermal prospects. There is no reasonable way of defining the success for such wells: such early exploration wells may not be included in all fields in this database and no information is available to assess the impacts of any such information on particular fields. 5) The oldest well in this database dates from 1905; the database contains data on wells drilled in every decade since 1940. Some of the techniques used in the surveying and drilling of older wells may now be antiquated, with the result that the analysis reflects historical data and not, necessarily, current trends. The development of new surveying techniques, the adoption of directional drilling, and improvements in drilling techniques may have boosted average well success and capacity: this report attempts to analyze this effect by examining well success by decade in section 4.4, below. 10 Success of Geothermal Wells: A Global Study 3. Overview of the Database As at end-2011, the world’s total installed geothermal electric power generation capacity stood at more than 10,700 MWe. The database on which this report is based covers 2,613 wells throughout 57 fields in 14 countries. These fields together have a total capacity of 7,575 MWe (see Annex A, below). On that basis, the wells in the database cover about 71 percent of global installed geothermal power capacity. Each of the fields cited in the database is used primarily for electricity production. To the extent verifiable data are available, the assembled database includes the following parameters for each well: (a) Well Code; (b) Geology Code; (c) Resource Code; (d) completion date; (e) initial and current status of the well; (f) gross power capacity (MWe, as at the date such capacity was reported); (g) total depth; (h) production casing outer diameter; (i) whether a well was successful; (j) whether a well has been pumped; and (k) whether a well has been re-drilled. 3.1 Wells and Fields In order to preserve confidential data, each well cited in this report has been assigned a three-digit “Well Code,â€? constructed as follows: an initial digit denoting the country in which the well is located; a second digit representing the geothermal field within such country; and a third digit representing the well number within that field. A sample code would thus appear as “1.2.5.â€? For fields within the United States, the Country Code shown in fact refers to a specific state within the country. The well number refers to the planned drilling sequence in any given field: the order in which wells were actually drilled may differ from this, and can be deduced from the well completion date. Figure 1, below illustrates the distribution of field size within in the database (as measured by the number of wells per field). It can be seen from this that 10–20 is the most common number of wells typically found in a field; fields with between 20 and 50 fields occur less often, and it is rare for a field to have more than 50 wells. 11 Figure 1: Distribution of number of wells, by field size Distribution 16 of number of wells, by field 14 size. 12 Number of fields 10 8 6 4 2 0 >0 >10 >20 >30 >40 >50 >60 >70 >80 >90 >100 <=10 <=20 <=30 <=40 <=50 <=60 <=70 <=80 <=90 <=100 Number of wells in field As discussed in section 2.4, above the infrequency of fields with fewer than 10 wells suggests that the database may be skewed towards the larger fields. Since the success rate increases as more wells are drilled in a field (see section 4.2, below), the success rates shown in this report may be higher than would be found if the database included more small fields. 3.2 Geology Code The Geology Code as cited in this document (and the categorizations below) refers to rock type rather than geologic structure and might, arguably, be better described as a “lithology codeâ€?. Nonetheless, in the context of this report the following categorizations denote the underlying reservoir rock: 1) granitic/higherâ€?grade metamorphic; 2) tertiary and older volcanic/volcaniclastic (largeâ€?scale volcanic structures absent); 3) younger volcanic/volcaniclastic (largeâ€?scale volcanic structures (volcanoes, calderas) preserved); 4) sedimentary basin (clastic, drilled above basement); and 5) sedimentary basin (clastic, wells drilled into basement). These geologic categories reflect generic hydraulic rather than chemical or mineralogical properties. The reason for emphasizing hydraulic properties rather than the mineralogy of a geologic category is that the productivity of a well is predominantly a function of the following parameters: (a) the hydraulic properties of the reservoir (storage capacity and flow capacity); (b) the diameter and skin factor (an index of well-bore flow efficiency) of the well; and (c) the enthalpy of the produced fluid. A well’s hydraulic properties are therefore partially dependent on the porosity and permeability of the reservoir; in particular, the presence of fissures in the rock (caused by stresses) will dramatically increase its permeability. It is usually the case that older rocks are more likely to be fractured and will therefore have higher permeability, thus facilitating geothermal wells with higher average capacity, although such fracturing will also be dependent on local seismicity. 12 Success of Geothermal Wells: A Global Study 3.3 Resource Code Each well cited in this report has been allocated a “Resource Code,â€? ranging from one to seven, indicating the approximate enthalpy of the fluid produced from the well. This code follows the classification scheme for geothermal reservoirs proposed by Sanyal (2005):3 1) non-electrical grade (<100oC); 2) very low temperature (100oC to <150oC); 3) low temperature (150oC to <190oC); 4) moderate temperature (190oC to <230oC); 5) high temperature (230oC to <300oC); 6) ultra-high temperature (300oC+); and 7) steam field (230oC to 240oC). The Resource Code is useful in checking the correlation between the enthalpy and the capacity of a well and, therefore, the success rate of drilling. While the Geology Code indirectly reflects the hydrological properties of a well, the Resource Code reflects the reservoir fluid enthalpy. As such, the combination of the Geology Code and Resource Code should result in an approximate representation of the production potential (MWe) of a well. Table 1, below summarizes the prevalence of fields and wells in the database by geology, resource type, and temperature, as defined above. This shows that a large proportion of fields and wells are in younger volcanic areas with largeâ€?scale volcanic structures preserved (Geology Code 3), and in high-/ultra-high-temperature resources. Table 1: Geology Geologic type Resource Resource fluid No. of No. of Prevalence Code Code characteristics fields wells of fields and 1 Granitic/higherâ€?grade 4 Moderate temperature 1 38 wells, by metamorphic geology and 5 High temperature 1 150 resource type. 2 Tertiary and older volcanic/ 3 Low temperature 5 98 volcaniclastic (largeâ€?scale 4 Moderate temperature 4 98 volcanic structures absent) 5 High temperature 1 33 7 100 percent steam 1 378 3 Younger volcanic/volcani- 4 Moderate temperature 6 155 clastic (largeâ€?scale volcanic 5 High temperature 15 522 structures (volcanoes, calde- 6 Ultra-high temperature 12 539 ras) preserved) 7 100 percent steam 2 93 4 Sedimentary basin (clastic, 3 Low temperature 2 178 drilled above basement) 5 High temperature 1 13 6 Ultra-high temperature 2 257 5 Sedimentary basin (clastic, 2 Very low temperature 1 9 wells drilled into basement) 3 Low temperature 1 8 4 Moderate 2 4 3 S.K. Sanyal, “Classification of Geothermal Systems – A Possible Schemeâ€? (paper presented at the Thirtieth Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, California, January 31–February 2, 2005). SGP –TR-176. 13 3.4 Completion Date The completion date of a well is the date by which all drilling and any re-working is complete. 3.5 Well Status The database refers to both the initial and current status of all wells, in order to give an indication of the state of the well immediately after completion of drilling, and at its most recently known state (normally within the last few years). A definition of each of the statuses used in the database is given in Table 2, below. Table 2: Status Definition Well status – Abandoned/plugged Well is closed with a concrete plug, not to be reopened definitions. Blow-out Steam pressure is too high and may not be controllable: well may be shut-in Discovery well/exploration Early-stage well used to prove existence and size of geothermal reservoir Dry hole No fluid in the well, usually due to low permeability of the reservoir Gradient Slim-bore hole used to measure changes in temperature with depth Idle Well currently surplus to requirements and closed (although can be reopened if necessary) Injector Used to re-inject geothermal fluids into reservoir Marginal Low permeability of reservoir or high skin factor of bore make the well of low value Marginal producer Low productivity but still used to generate power Monitoring well/observation Well used to monitor reservoir conditions: not suitable for production or injection Never produced Not economically useful Non-commercial Purpose of drilling was not for commercial reasons, may be exploratory Not productive Not economically useful Not tested Unknown status Production Well used to generate power Re-drilled Well has been partially re-drilled due to low initial productivity Replaced Closed and re-drilled elsewhere, usually due to reduced output of original well Shut-in Well is closed to prevent blow-out or unrequired discharge Stand-by injector Well not needed, but can be used as injector if required Suspended/not completed Well not completed, due to mechanical problems while drilling Unknown Status cannot be determined from available data 3.6 Well Capacity Where cited in this report, the capacity of a well represents its gross electrical power capacity (MWe) as estimated on the date shown in the adjoining column. In most cases such data is sourced on the basis of the initial flow test of the well, and subsequent data is not available to check any degradation of well output over time. 14 Success of Geothermal Wells: A Global Study For the purposes of this report the initial capacity of a well is estimated on the basis of its metering history: the methodology used to calculate capacity is shown in Annex B, below. Some injection wells have an attributed capacity as a result of having been converted from productive to injector wells. Figure 2, below presents a histogram of the gross capacities (MWe) of those 1,087 wells for which capacity could be verified.4 Figure 2: Distribution of well capacities Distribution of 160 well capacities (MWe). 140 120 Number of wells 100 80 60 40 20 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Gross capacity (MWe) Figure 2, above indicates the most frequent gross capacity of three MWe per well with a positive skew on the distribution of 1.64. This figure shows that a wide range of well capacities is possible, though lower capacities are significantly more likely. The average capacity of all wells in the database is 7.3 MWe, though this is strongly skewed by the inclusion of several very high-capacity wells: the maximum capacity of a single well in the database is 52 MWe. Due to the long tail of the distribution, and in order to avoid any undue distortion of results, capacities greater than three standard deviations from the average of the distribution (i.e., greater than 23.8 MWe) have been ignored when examining the effect of different factors on capacity. When these wells are excluded the average well capacity is 6.8 MWe. 3.7 Well Depth “Well depthâ€? refers to the total depth of a well as measured from the ground surface to the bottom. Most fields have a range of well depths (as shown in Figure 3, below) suggesting that most fields have multiple reservoirs, each at different depths. 4 Capacity data was also available for an additional 27 wells that exhibited capacities in excess of 20 MWe. To avoid undue complexity these have not been shown here. 15 Figure 3: Range of depths by field Average well 7,000 depths and Maximum depth range of well 6,000 Average depth, by field. 5,000 Minimum depth Depth (m) 4,000 3,000 2,000 1,000 0 1.01 1.02 1.03 1.04 1.05 1.06 1.09 1.10 1.11 1.12 1.13 1.14 1.16 1.17 1.18 1.19 1.20 1.21 1.22 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 4.01 4.02 5.01 6.01 7.01 7.02 8.01 8.02 9.01 9.02 10.01 10.02 11.01 13.01 13.02 14.01 14.02 Field number Figure 4, below illustrates the changing distribution of well depths in accordance with project phase (Exploration, Development and Operation, defined in section 3.11, below). Figure 4: Well depths by project phase Prevalence of 30% Exploration well depths by Development project phase. Frequency of well depths by 25% Operation 20% project phase 15% 10% 5% 0% >=0 >=500 >=1,000 >=1,500 >=2,000 >=2,500 >=3,000 <500 <1,000 <1,500 <2,000 <2,500 <3,000 <3,500 Well depth (m) Figure 4 demonstrates that while wells in the Development Phase are typically drilled to similar depths to those in the Exploration Phase, developers move to exploiting deeper reservoirs in the same field as a project becomes more advanced. 3.8 Casing Size Casing size reflects the outer diameter of the casing of the main section of a well. This is usually measured in inches, but also occasionally in millimeters. For the purposes of the database and for the analysis, diameters were converted from inches to millimeters to facilitate comparison between metric systems. Four hundred and forty one of the wells in the database have a known casing size. In some cases the depth of the casing is also known: where available, this is also shown, in meters. 16 Success of Geothermal Wells: A Global Study 3.9 Well Success All wells were categorized accordingly: (a) â€?Nâ€? denotes a well deemed unsuccessful; (b) “Yâ€? denotes a successful well; and (c) “NAâ€? indicates that the information available was not sufficiently adequate to determine whether a well was successful or not. The criteria used for the definition of a successful well are outlined in more detail in section 2.3, above. Overall, 1,827 wells (70 percent of the total) are deemed to be successful, 560 (21 percent of the total) are deemed unsuccessful, leaving 226 (nine percent of the total) of unknown status. 3.10 Re-drilling and Pumping The database differentiates between original wells (“Yâ€? – 2,184 wells) and re-drilled wells (“Nâ€? – 429 wells), and between those wells which have a pump installed (“Yâ€? – 147 wells) and those which flowed without pumping (“Nâ€? – 2,466 wells). 3.11 Exploration, Development, and Operation Wells As shown in section 4.2 below, the probability of achieving a successful well increases as more wells are drilled in a field. For the purposes of comparing the success of wells in different fields, it is therefore necessary to divide the drilling program into stages. The first several wells drilled in a field are usually to confirm the existence and potential of a reservoir. Then, sufficient numbers of wells are drilled to reach the desired or optimal power output of the field. Once sufficient wells are drilled and the power plant is operational, subsequent wells are drilled in order to replace those old wells whose output has diminished. These phases of drilling can be described respectively as Exploration, Development, and Operation. For the purposes of this study, the first five wells drilled in a field are deemed to be exploration wells (though in practice this could vary from anywhere between two and 10 wells), the next 25 development wells, and wells drilled thereafter operational wells. The actual number of development wells in a field will vary significantly, depending on the characteristics of the reservoir, the size of the planned power plant, and the success rate in drilling. Due to the increases in the probability of well success as field exploitation progresses, further analysis of success in this report is focused on those wells drilled during the Development Phase of the field (i.e., the sixth to 30th wells drilled). Three fields in this survey have five or fewer wells (field references 3.1, 7.1, and 12.1) and are therefore excluded from most of the analysis, except where exploration wells are specifically included. 3.12 Excluded Fields The methodology used in exploring some fields is known to have been below the standards of international best practice, and the success rates of wells in these fields are not, therefore, thought to be representative. For this reason, these fields (field references 1.7, 1.8, 1.15, 5.2, and 12.1, representing 86 wells) have been excluded from the analysis in this report, though they remain in the database. 17 4. presentation and analysis of results 4.1 Overall Success Rate The database shows 78 percent of wells (of known status) to be successful. Figure 5, below presents a histogram of the overall success rates of wells across the 52 fields analyzed in the database (including wells from each phase of field development), showing a modal average of 80–90 percent of all wells deemed to be successful. The median is 71 percent. Figure 5: Variation in success, by field Success rates 25% across all fields. Percentage of fields within given range of well success rates 20% 15% 10% 5% 0% <=30% >30% >40% >50% >60% >70% >80% >90% <=40% <=50% <=60% <=70% <=80% <=90% <=100% Average success rates of wells drilled in each field Figure 5 indicates a low probability of a field achieving a success rate of less than 40 percent across all wells drilled. A low success rate does not mean that a project, per se, will be unsuccessful – this being dependent on other factors contributing to the economic viability of the project. 4.2 Learning Curves It is to be expected that the first wells drilled in a field are less likely to be successful than subsequent wells, as the developer gains a better understanding of the size, location, and dynamics of the targeted reservoir. Figure 6, below shows the improvement in the cumulative average success rate of wells as fields are developed (success is averaged across all fields in the database). 18 Success of Geothermal Wells: A Global Study Figure 6: Cumulative average well success rates Learning curve 80% – well success Cumulative average success rate rates. 70% y = 0,07ln(x) + 0,48 R² = 0,99 60% 50% 40% Development 30% Exploration Operation 20% 10% 0% 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 Well sequence number The designation of wells as “explorationâ€?, “developmentâ€?, and “operationâ€? is discussed in section 3.11, above. While the first well drilled shows an average success rate of 50 percent, the success rate averaged over the first five wells increases to 59 percent, rising to 71 percent over the first 30 wells drilled: a trend which continues beyond the 50th well. As shown in Figure 6, this trend is highly correlated to a logarithmic curve (with R2 equal to 0.99). Figure 7, below clearly shows the increasing average success rate as a project moves from one phase to the next. Figure 7: Average well success rate, by project phase Success rates 100% by project 90% phase. Average well success rate 80% 70% 60% 50% 40% 30% 20% 10% 0% Exploration Development Operation During the Exploration Phase an average 59 percent of wells are successful: during the Development Phase this increases to 74 percent, and during the Operation Phase to 83 percent. Figure 7 demonstrates a clear “learning curveâ€? effect for targeting and drilling geothermal wells, and shows that the success rate improves as a the developer builds on knowledge gained from earlier wells in the field. The possibility that this learning curve is due to a statistical influence of increased sample size on a binomial event has been considered, but 19 rejected – the binomial distribution assumes each event is independent, and therefore assumes no learning curve as a pre-condition.5 Knowledge gained from early wells, while increasing the success rate, does not necessarily lead to greater power capacities of new wells as field development progresses. Figure 8, below shows the cumulative average capacity of the first 50 wells drilled, averaged across all fields. The cumulative average capacity is the average capacity of all wells up to and including a particular well number. The cumulative average capacity across all fields in the database remains largely flat at 6.5 MWe once the Development Phase is started, and remains so into the Operation Phase, showing that there is no learning curve for capacity. This trend continues beyond the first 50 wells. Figure 8: Cumulative average capacity Cumulative 9 average 8 capacity of Average capcity (MWe) wells (MWe). 7 6 5 4 3 2 1 0 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 Well sequence number Figure 8 excludes wells with abnormally high capacities, as discussed in section 3.6, above. 4.3 Variation in Success, by Project Phase An analysis of the variation in well success in each phase of field development (see Figure 9, below) shows that the Exploration Phase has the greatest range of well success rates, making forecasting of likely success very difficult. However, the database shows 63 percent of fields with well success rates of more than 50 percent in the Exploration Phase; and in 42 percent of fields the success rate exceeds 70 percent. Once a project enters the Development Phase the probability of successful wells being achieved is normally in the 60–70 percent range: the database indicates that 75 percent of fields demonstrated more than 60 percent of wells achieving success in this phase. In the Operation Phase, the most common success rate achieved is between 90 and 100 percent. From the investment perspective, therefore, the key challenge is to manage the disparate well failure risk in the various different phases of project development. This analysis suggests that once a project moves beyond the early Exploration Phase, the risks of failure become lower and more predictable. 5 S.K. Sanyal and J.W. Morrow, “Success and the Learning Curve Effect in Geothermal Well Drilling – A Worldwide Survey,â€? (paper presented at the Thirty Seventh Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, California, January 30 - February 1, 2012). SGP-TR-194. Available at: https://pangea.stanford. edu/ERE/pdf/IGAstandard/SGW/2012/Sanyal.pdf. 20 Success of Geothermal Wells: A Global Study Figure 9: Variation in success rates, by project phase Variation in 50% Exploration success rates, 45% Percentage of fields exhibiting Development by phase of 40% Operation development. specific success rates 35% 30% 25% 20% 15% 10% 5% 0% >=0 >10 >20 >30 >40 >50 >60 >70 >80 >90 <=10 <=20 <=30 <=40 <=50 <=60 <=70 <=80 <=90 <=100 Success rates 4.4 Improvements over Time It would be reasonable to assume that surveying and drilling techniques have improved in recent decades, and that project developers and drilling companies are becoming more adept at locating and reaching geothermal resources. Figure 10, below illustrates trends in the successful drilling of wells for each decade since the 1960s, across each project phase. Figure 10: Drilling success rates over time, by project phase Improvements 100% Exploration in drilling 90% Development success rates 80% Operation over time, by project phase. 70% 60% Success 50% 40% 30% 20% 10% 0% 1960s 1970s 1980s 1990s 2000s Decade It would appear that the success rates of wells drilled during the Exploration Phase (i.e., the first five wells drilled) have improved significantly, although the difficulty of defining success in this phase (see section 2.3, above), combined with the wide variation (see section 4.3, above) makes it difficult to draw strong conclusions. A recent publication from IGA Service GmbH, supported by IFC, on mitigating risks in geothermal exploration could do much to further support developers during this critical stage.6 6 Geothermal Exploration Best Practices: A Guide to Resource Data Collection, Analysis, and Presentation for Geothermal Projects, IGA Service GmbH, (2013). Available at: http://www.geothermal-energy.org/ifc-iga_launch_ event_best_practice_guide.html. 21 However, the same trend is not seen in other phases of project development, and success rates for wells drilled during the Operation Phase (i.e., all wells after the 30th well drilled) have generally decreased. This suggests that any improvements in technique have largely been achieved in the initial targeting of wells – the result of improvements in surveying and resource modeling techniques rather than actual drilling. The reduction in the success rate for wells drilled during the Operation Phase may also reflect over-exploitation of those resources into which such wells were drilled. 4.5 Impact of Well Depth While a well must, of course, reach the reservoir in order to be successful, well depth does not show any clear trend in influencing either well capacity (MWe) or success, suggesting that other factors may be more significant here (see Figure 11, below). Figure 11: Average capacity and success, by depth Average well 10 100% capacity (MWe) 9 90% and success, 8 80% Average capacity (MWe) by depth of development 7 70% wells. 6 60% Success 5 50% 4 40% 3 30% 2 20% 1 10% 0 0% >=0 >=500 >=1,000 >=1,500 >=2,000 >=2,500 >=3,000 <500 <1,000 <1,500 <2,000 <2,500 <3,000 <3,500 Well depth (m) 4.6 Impact of Casing Size It might be assumed that the larger the diameter of a well casing, the greater the flow rate of geothermal fluid and, consequently, the greater the well capacity (MWe). Figure 12, below, however, suggests no obvious relationship between well capacity and casing size. Figure 12 illustrates the correlation between the number of wells by various casing sizes, and the average capacity of each. While most wells use casings of between 200 and 350mm in diameter (77/8 –133/4â€?), there is no obvious relationship between casing size and well capacity (MWe). However, since data on casing size is only available for 441 wells, this result may not be significant. Larger well casings do allow higher flow rates. The casing size is determined before the well is drilled and (in the case of initial exploration wells), before the characteristics of the reservoir are known. Wells with larger casings are more expensive to drill; there is, therefore, a balance to be struck between drilling costs and the maximum flow rate of the well. For that reason, the casing sizes of the wells in the database may not be optimized to match resource characteristics, reducing any correlation between casing size and capacity. 22 Success of Geothermal Wells: A Global Study Figure 12: Frequency and capacity of wells, by casing size Frequency and 250 100 capacity of 90 development Average capacity (MWe) 200 80 wells (MWe), by casing size. 70 Number of wells 150 60 50 100 40 30 50 20 10 0 0 >=0 >=150 >=200 >=250 >=300 >=350 >=400 <150 <200 <250 <300 <350 <400 Casing size (mm) 4.7 Impact of Geology The highest probability of success is seen in sedimentary basins where wells are drilled above the basement (Geology Code 4, Figure 13, below). There is little variation in success rates between other geology types. Figure 13: Capacity and success rates, by geology Well capacity 10 100% (MWe) and 9 90% success rates of Average capacity (MWe) 8 80% development wells, by 7 70% geology. 6 60% Success 5 50% 4 40% 3 30% 2 20% 1 10% 0 0% 1 2 3 4 5 Geology Code The highest average capacities are seen in tertiary and older volcanic/volcaniclastic systems (Geology Code 2). This is consistent with expectations – old rocks are more likely to have significant fractures, which increases the permeability of the reservoir and so increases the productivity of the wells. Equally, granitic rock (Geology Code 1) has the lowest average capacity, typically the result of the characteristically low porosity and permeability of such rock, and the low incidence of fracturing. Limited capacity data on the small number of wells located in fields of Geology Code types 1 and 5 makes it difficult to reliably assess the distribution of capacity for these geologies. However, Figure 14, below illustrates the distribution of well capacity for other Geology Codes. 23 Figure 14: Distribution of well capacity, by geology Distribution of Percentage of wells of geology type 25% well capacity (MWe) by 20% geology. Geology Code 2 3 4 15% 10% 5% 0% 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Well capacity (MWe) While data fluctuations make definite conclusions difficult to draw, it appears that fields with tertiary and older volcanic characteristics, in which largeâ€?scale volcanic structures are absent (Geology Code 2), tend to have higher capacity (a modal capacity of six MWe) in comparison with fields with younger volcanic features (Geology Code 3). Sedimentary basins where drilling is above the basement (Geology Code 4) have a modal capacity of 2.5–3 MWe. This may be because older volcanic structures are more fractured than other geology types, and so permeability of the reservoir is higher, allowing greater flow of geothermal fluids. 4.8 Impact of Resource Enthalpy It might be reasonable to assume that higher enthalpy resources would result in higher- capacity wells. Figure 15, below, however shows that while this trend is, in general, consistent, discrepancies do occur, indicating other factors are important. Figure 15: Capacity and success, by resource type Well capacity 10 100% (MWe) and 9 90% success of Average capacity (MWe) 8 80% development wells, by 7 70% resource code. 6 60% Success 5 50% 4 40% 3 30% 2 20% 1 10% 0 0% 2 3 4 5 6 7 Resource Code Further analysis suggests that the maximum capacity of a well does increase with increasing enthalpy. The modal capacities for Resource Codes 3, 5, and 6 are all three MWe, whereas those fields with a Resource Code of 4 or 7 have a modal capacity of 5.5 MWe and six MWe, respectively. Enthalpy is not correlated to well success, however, implying that higher- temperature fields do not necessarily yield more successful wells. 24 Success of Geothermal Wells: A Global Study 4.9 Combining Geology and Enthalpy As previously mentioned in section 3.3, above the combination of the Geology Code and Resource Code gives an approximate representation of a well’s production potential. Table 3, below illustrates the average capacities of various combinations of geology and resource type. Table 3: Average capacity (MWe) Geology Code Combined 1 2 3 4 5 impact of geology and 1 resource types 2 3.6 Resource Code on average 3 3.4 3.0 capacities 4 4.8 6.4 6.7 6.1 (MWe). 5 5.0 5.9 5.4 6 7.6 8.2 7 8.4 6.9 These data suggest that various combinations of geology and resource type can give rise to considerable variation in average capacity, although it would appear resource type has a greater impact than geology type. A regression analysis (Annex C, below) carried out on the impact of geology and resource type on well capacity suggests that about 11 percent of the variation in anticipated energy output is explained by those two factors. A full analysis of variance gives the following anticipated well capacities (MWe) for different combinations of Resource and Geology Codes (see Table 4, below). Table 4: Average capacity (MWe) Geology Code Anticipated 1 2 3 4 5 well capacity (MWe). 1 2 Resource Code 3 2.8 4.3 3.3 3.4 4 5.5 6.9 5.9 6.1 5 5.0 6.4 5.4 5.6 6 8.4 9.8 8.8 9.0 7 7.0 8.5 7.5 7.6 No data is available for Resources Codes 1 and 2, nor for Geology Code 4 in Table 4 as these were used as “dummy variablesâ€? for the analysis. 4.10 Impact of Re-drilling Sixteen percent of the wells cited in the database have been re-drilled. This proportion does not show significant variation across the different project phases (Exploration, Development, and Operation). A well is only re-drilled if the original well was unsuccessful. Overall, the average success rate of re-drilled wells is 87 percent, compared with 77 percent for original 25 wells. Success rates for re-drilled wells are higher than success rates for original wells in the Exploration and Operation Phases. The success rate of re-drilled wells in the Development Phase is consistent with the success rate of original wells (Figure 16, below). This clearly shows the value of re-drilling (where that option is possible and viable), since re-drilling is generally less expensive than drilling a new well. Figure 16: Average success of original and re-drilled wells, by stage Impact of 100% Original re-drilling on 90% Re-drilled success rates, 80% by project phase. 70% 60% Success 50% 40% 30% 20% 10% 0% Exploration Development Operation The effectiveness of re-drilling is strongly linked to field characteristics. Twenty one percent of the fields in the database indicate a success rate of less than 10 percent under re-drilling, but 49 percent indicate a probable success rate in excess of 90 percent (Figure 17, below). Only a few fields demonstrate moderate success rates. Figure 17: Variations in success rates of original and re-drilled wells Variations in 60% success rates of original 50% Percentage of fields within given success rate range Re-drilled and re-drilled development 40% wells. 30% Original 20% 10% 0% >0 >10 >20 >30 >40 >50 >60 >70 >80 >90 <=10 <=20 <=30 <=40 <=50 <=60 <=70 <=80 <=90 <=100 Success rate range Figure 18, below suggests that re-drilled wells do exhibit slightly higher average capacity (eight MWe compared with seven MWe for original wells) and modal capacity (five MWe compared with three MWe for original wells). 26 Success of Geothermal Wells: A Global Study Figure 18: Distributions of well capacities for original and re-drilled wells Distribution of Percentage of wells for each shown 16% well capacities (MWe) for 14% Original Re-drilled original and 12% re-drilled wells. 10% capacity 8% 6% 4% 2% 0% 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Well capacity (MWe) 4.11 Impact of Pumping One hundred and forty seven wells in the database are pumped, while the remainder are not. Wells are only pumped if they are at least partially successful. Figure 19, below illustrates that the distributions of capacities for pumped and non-pumped wells are approximately the same, suggesting that there is little benefit in pumping wells that do not require it. The small sample size makes it difficult to draw strong conclusions, however. Figure 19: Capacity distribution of pumped and non-pumped wells Distribution 35% of capacity for Percentage of wells by pump status pumped and 30% non-pumped Pumped Not pumped 25% wells. 20% 15% 10% 5% 0% 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Capacity (MWe) 27 5. conclusions The “success rateâ€? of geothermal wells is an awkward concept. It is best represented by a calculation of the return on investment (ROI) for each well. In the absence of such data, however, a reasonable approximation might be the drilling cost of a well vs. its capacity. No such cost data was available during the compilation of this report, however, and for the purposes of this analysis a well is assumed to be successful only if its capacity exceeds a specific threshold. In most cases this threshold is set at three MWe or higher, except in those instances where field data indicates that wells with a lower capacity remain connected to power plants. Similarly, injection wells that have been active for a long time are also deemed to be successful wells, since a genuinely unsuccessful well is unlikely to be used as an injector in the long term. 5.1 Key Findings 1. Eighty five percent of the wells in the database were drilled in fields with the following geology and resource characteristics (in decreasing order of occurrence). Table 5: Geology Resource fluids No. of wells The most Younger volcanic/volcaniclastic (large-scale volcanic frequently Ultra-high temperature 539 structures (volcanoes, calderas) preserved) occurring geology and Younger volcanic/volcaniclastic (large-scale volcanic High temperature 522 resource structures (volcanoes, calderas) preserved) characteristics Tertiary and older volcanic/volcaniclastic (large-scale 100 percent steam 378 of wells in the volcanic structures absent) database. Sedimentary basin (clastic, drilled above basement) Ultra-high temperature 257 Sedimentary basin (clastic, drilled above basement) Low temperature 178 Younger volcanic/volcaniclastic (large-scale volcanic Moderate temperature 155 structures (volcanoes, calderas) preserved) Granitic/higherâ€?grade metamorphic High temperature 150 2. Of those wells analyzed, 68 percent were deemed to be successful and 20 percent unsuccessful. The status of the remainder (12 percent) could not be verified. Of those wells for which status could be verified, 78 percent were successful. 28 Success of Geothermal Wells: A Global Study 3. The probability of a well being successful increases in accordance with the number of wells drilled in a field, demonstrating a strong “learning curveâ€? effect. The average capacities of wells do not show the same trend, however. 4. Of the 52 fields analyzed, the poorest-performing field achieved a success rate of only 35 percent. However, two thirds of all fields surveyed recorded success rates in excess of 60 percent. This demonstrates that the probability of success varies widely across fields – a finding which further emphasizes the unique characteristics of individual geothermal fields. 5. There is no reasonable basis for forecasting the probability of success in the Exploration Phase of a project (defined here as the first five wells). In 63 percent of fields, more than 50 percent of wells proved successful in the Exploration Phase. This low average success rate across exploration wells serves to confirm the high risks of initial drilling, as well as driving high return expectations for early-stage investors. It is clear, therefore, that every effort should be made to reduce risk in the Exploration Phase. This can be partly achieved through the implementation of international best practice in geothermal exploration (to which end IGA Service GmbH has published its Geothermal Exploration Best Practice Guide, supported by IFC),7 through the use of the most current cutting-edge technologies and techniques, and through the input of specialists in the field. This also emphasizes the role of public-sector involvement in geothermal exploration, where public interest may make the inherent higher risks (and lower financial returns) more acceptable. 6. The success rate for wells drilled during the Exploration Phase has steadily improved in recent decades. The success rate in later project phases has not shown the same improvement, however, suggesting that the most effective improvements have been made in the surveying and modeling of reservoirs rather than in drilling per se. 7. A success rate of between 60 and 70 percent was found to be the most common outcome for wells drilled during the Development Phase (the median success rate for wells drilled during the Development Phase is 72 percent). In seventy six percent of all fields surveyed more than 60 percent of wells drilled during the Development Phase were deemed to be successful. 8. Eighty three percent of fields surveyed indicated a success rate of more than 70 percent for wells drilled during the Operation Phase. The modal average success rate for wells drilled in the Operation Phase was 90–100 percent. 9. The modal capacity of all wells surveyed was found to be three MWe. However, 21 percent of all wells surveyed demonstrate a power capacity in excess of 10 MWe (the maximum power capacity recorded for a single well is 52 MWe). This data is useful in estimating the number of wells required for specific power plant capacity in initial project planning. 10. Geothermal wells have successfully been drilled to depths of between 100 m and 6,000 m. Most fields exhibit wells drilled to a wide range of depths: this could indicate the presence of multiple reservoirs in many fields, each at different depths. The depth of a well does not appear to have any impact on the likely success or capacity of a well (although clearly a well needs to reach the reservoir in order to be successful). 7 Geothermal Exploration Best Practices: A Guide to Resource Data Collection, Analysis, and Presentation for Geothermal Projects, IGA Service GmbH (2013). Available at: http://www.geothermal-energy.org/ifc-iga_launch_ event_best_practice_guide.html. 29 11. Most wells use casing sizes of between 200mm and 250mm (77/8 –97/8â€?). Casing size does not have any clear impact on capacity, however, although capacity is throttled by smaller casings. 12. There is considerable variation in well success rates, partially attributable to the underlying geology of the reservoir. The highest success rates are to be found in fields with a sedimentary basin in which drilling is above the basement. 13. The modal capacity of wells surveyed is three MWe. This is consistent across low-, high- and ultra-high-temperature resources. Moderate-temperature and 100-percent- steam resources exhibit modal capacities of 5.5–6 MWe, however. Maximum capacity, in general, increases as a function of the resource category (enthalpy). 14. Regression analysis shows that resource enthalpy does have a significant influence on average well capacity: 11 percent of a well’s capacity (MWe) is influenced by a combination of geology and enthalpy. 15. Original and re-drilled wells exhibit no significant differences in capacity. Eighty seven percent of re-drilled wells in the database were deemed to be successful, in comparison with 77 percent of original wells. 16. The success rates of re-drilled wells can vary significantly: of the 31 fields for which such data was available, eight of the fields in the database recorded success rates of under 10 percent on re-drilled wells; 19 other fields with re-drilled wells, however, recorded success rates of more than 90 percent. This variation is attributable to the field in which such wells are located. 17. The statistical distributions of well capacities are similar for both self-flowing and pumped wells, with a peak of three MWe for both. 30 Success of Geothermal Wells: A Global Study 6. references and further reading R.C. Earlougher, “Advances in Well Test Analysis,â€? Society of Petroleum Engineers Monograph, 5 (1977). An Assessment of Geothermal Risks in Indonesia (Richmond, California: GeothermEx, Inc. for World Bank Group, 2010). Available at: http://www.ppiaf.org/sites/ppiaf.org/files/ publication/REPORT_Risk_Mitigation_Options_Indonesia_0.pdf. S.K. Sanyal, M. Che, J.R. McNitt, N. Vasquez, B.S. Tolentino, A. Alcaraz, R. Datuin, “Drilling Problems and the Learning Curve – an Example from the Palimpinon Geothermal Field, the Philippines.â€? Geothermal Resources Council: Transactions. 6. (1982): 227–230. Available at: http://pubs.geothermal-library.org/lib/grc/1000958.pdf. S.K. Sanyal, R.C. Henneberger and P.J. Brown, “Economic Analysis of Steam Production at the Geysers Geothermal Field, California.â€? Geothermal Resources Council: Transactions. 13. (1989): 423–430. Available at: http://pubs.geothermal-library.org/lib/grc/1001811.pdf. S.K. Sanyal, “Classification of Geothermal Systems – A Possible Scheme,â€? (paper presented at the Thirtieth Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, California, January 31–February 2, 2005). SGP –TR-176. Available at: https:// pangea.stanford.edu/ERE/db/IGAstandard/record_detail.php?id=798. S.K. Sanyal, J.W. Morrow and S.J. Butler, “Geothermal Well Productivity: Why Hotter is Not Always Better.â€? Geothermal Resources Council: Transactions. 31. (2007): 573–579. Available at: http://pubs.geothermal-library.org/lib/grc/1025281.pdf. S.K. Sanyal, J.W. Morrow, M.S. Jayawardena, N. Berrah, S.F. Li and Suryadarma , “Geothermal Risk in Indonesia – A Statistical Inquiry,â€? (paper presented at the Thirty Sixth Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, California, January 31–February 2, 2011). SGP – TR-191. Available at: http://www. geothermal-energy.org/pdf/IGAstandard/SGW/2011/sanyal2.pdf. S.K. Sanyal and J. W. Morrow, “An Investigation of Drilling Success in Geothermal Exploration, Development and Operation.â€? Geothermal Resources Council: Transactions. 35. (2011): 233–237. Available at: http://www.slb.com/~/media/Files/geothermal/tech_ papers/sanyal_2011_3.pdf. 31 S.K. Sanyal and J. W. Morrow, “Quantification of Geothermal Resource Risk – A Practical Perspective,â€? Geothermal Resources Council: Transactions. 34. (2010): 125–130. Available at: http://www.slb.com/~/media/Files/geothermal/tech_papers/sanyal_2010_4. pdf. R. Schulz, R. Jung and R. Schellschmidt, “Assessment of Probability of Success for Hydro- geothermal Wells,â€? (paper presented at the World Geothermal Congress, Antalya, Turkey, April 24–29, 2005). Available at: http://www.geothermal-energy.org/pdf/ IGAstandard/WGC/2005/0407.pdf. S.K. Sanyal and J.W. Morrow, “Success and the Learning Curve Effect in Geothermal Well Drilling – A Worldwide Survey,â€? (paper presented at the Thirty Seventh Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, California, January 30 - February 1, 2012). SGP-TR-194. Available at: https://pangea.stanford.edu/ERE/pdf/ IGAstandard/SGW/2012/Sanyal.pdf. M. Gehringer and V. Loksha, Geothermal Handbook: Planning and Financing Power Generation (ESMAP/World Bank, 2012). Available at: http://www.esmap.org/sites/esmap. org/files/FINAL_Geothermal%20Handbook_TR002-12.pdf. Geothermal Exploration Best Practices: A Guide to Resource Data Collection, Analysis, and Presentation for Geothermal Projects (IGA Service GmbH, 2013). Available at: http:// www.geothermal-energy.org/ifc-iga_launch_event_best_practice_guide.html. World Energy Outlook 2010 (International Energy Agency, 2010). Available at: http://www. iea.org/publications/freepublications/publication/weo2010.pdf. 32 Success of Geothermal Wells: A Global Study ANNEX A geothermal fields covered in the database Country Field name Capacity Country Field name Capacity (MWe) (MWe) USA - CA Coso 270 Azores Pico Alto 0 USA - CA Geysers 1,800 Costa Rica Las Pailas 0 USA - CA Heber 110 Costa Rica Miravalles 165 USA - CA Salton Sea 330 El Salvador Ahuachapan 95 USA - CA East Mesa 100 El Salvador Berlin 104 USA - CA North Brawley 50 Guatemala Amatitlan 24 USA - CA Surprise Valley 0 Guatemala Zunil 24 USA - HI Puna 30 Indonesia Bedugul 0 USA - ID Raft River 13 Indonesia Darajat 260 USA - NM Baca Ranch 0 Indonesia Dieng 60 USA - NV Beowawe 17 Indonesia Kamojang 200 USA - NV Blue Mountain 50 Indonesia Karaha 0 USA - NV Brady's 26 Indonesia Patuha 0 USA - NV Desert Peak 13 Indonesia Sarulla 0 USA - NV Dixie Valley 62 Indonesia Wayang Windu 227 USA - NV Tuscarora 0 Italy Latera 40 USA - NV Rye Patch 13 Italy Mofete 0 USA - NV Salt Wells 19 Japan Okuaizu 65 USA - NV Soda Lake 26 Japan Uenotai 29 USA - NV Steamboat Springs 138 Kenya Olkaria 160 USA - NV Stillwater 47 Mexico Cerro Prieto 720 USA - UT Roosevelt 36 New Zealand Wairakei 212 New Zealand Ohaaki 115 Nicaragua San Jacinto 10 Nicaragua Momotombo 77 Philippines Bacman 150 Philippines Mahiao 142 Philippines MakBan 457 Philippines Mindanao 103 Philippines Negros 240 Philippines Tiwi 334 Philippines Malitbog 233 Philippines Tongonan 112 Turkey Germencik 47 Turkey Kizildere 20 total capacity 7,575MWe 33 ANNEX B estimating well power capacity The power capacity (MWe) of a self-flowing or pumped well can be estimated as outlined in Sanyal et al (2007).8 The relevant issues in assessing the power capacity of both self-flowing and pumped wells are outlined below. B.1 Self-flowing Wells From the value of the Productivity Index (PI) of a well and maximum allowable pressure drawdown, one can calculate the maximum available production rate (W) in kg/s of fluid using: W = (PI) Δp (1) where: Δp = pi – p (2) Data from commercial geothermal wells show a wide range in PI, from about 1 l/s/bar for marginally sub-commercial wells to as high as 40 l/s/bar for exceptionally prolific wells; a good geothermal production well typically shows a PI on the order of 10 l/s/bar. In equation (2), pi is initial static pressure in the reservoir and p is flowing bottom-hole pressure at the well, which will decline with time if the well is producing at a constant rate W. It should be noted that Δp is more commonly defined as (p– p), where p is average static reservoir pressure. Therefore, for a well flowing at a constant rate, p (and consequently PI) declines with time. This decline trend in PI is a function of the hydraulic properties and boundary conditions of the reservoir, and interference effects between wells (if several wells are active simultaneously). For such estimation, it is customary to utilize the so-called “Line- source Solutionâ€? of the partial differential equation describing transient pressure behavior in a porous medium filled with a single-phase liquid (Earlougher, 1977).9 This solution gives the production rate (W) from a single well in an infinite system as: W = 2Ï€(kh)Ï?∆p (3) µpD where: k = reservoir permeability h = net reservoir thickness kh = reservoir flow capacity Ï? = fluid density μ = fluid viscosity and pD = a dimensionless variable that is a function of time. equation (3), In equation pD (3), isis pD given by: given by: 1 −𝑟𝑟 2 í µí±?í µí±?𝐷𝐷 = − 𝐸𝐸𝐸𝐸 � 𝐷𝐷 � (4) (4) 2 4𝑡𝑡 𝐷𝐷 where: where: t = dimensionless time = time (𝑘𝑘ℎ)𝑡𝑡 (5)(5) D (í µí¼™í µí¼™í µí±?í µí±? â„Ž)𝜇𝜇𝑟𝑟 2 𝑡𝑡 𝑊𝑊 tD=dimensionless 8 S.K. Sanyal, J.W. Morrow and S.J. Butler, “Geothermal Well Productivity: Why Hotter is Not Always Better.â€? Geothermal Resources Council: Transactions. 31. (2007): 573–579. 9 Earlougher, R.C. (1977). Advances in Well Test Analysis. SPE Monograph Vol. 5, Society of Petroleum Engineers, Dallas, Texas. 34 Success of Geothermal Wells: A Global Study φ ct h = reservoir storage capacity ct = total compressibility of rock plus fluid φ = reservoir porosity t = time rD = dimensionless radius = r/rw, r = distance between the “line sourceâ€? and the point at which the pressure is being considered (equal to well-bore radius if flowing well-bore pressure is being considered) and rw = well-bore radius. In equation (4), Ei represents the Exponential Integral, defined by ∞ 𝑒𝑒−𝑢𝑢 𝐸𝐸𝐸𝐸 (−𝑥𝑥 ) = − ∫𝑥𝑥 𝑢𝑢 𝑑𝑑𝑑𝑑 (6) (6) It is seen that the flow capacity (i.e., permeability-thickness product) of a commercial well generally lies within the range of 1 to 100 Darcy-meter (D-m). Equation (3) is true if the well-bore skin factor is zero – i.e., if the well-bore flow efficiency is 100 percent, the well being neither damaged nor stimulated. If the skin factor(s) is positive (i.e., the well-bore is damaged), for the same flow rate W there will be an additional pressure drop given by: 𝑊𝑊𝑊𝑊 âˆ†í µí±?í µí±? 𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠 = 2𝜋𝜋(𝑘𝑘ℎ)𝜌𝜌 .s (7) (7) Productive geothermal wells usually display a small negative skin factor, which implies a “stimulatedâ€? well (i.e., the well-bore flow efficiency is greater than 100 percent), because such wells intersect open fractures. The next step is to estimate the net power available from the production rate of W. It is possible to estimate the fluid requirement per kilowatt power capacity, or kilowatt capacity equivalent of a given fluid supply rate, from: Electrical energy per kg of fluid = eWmax (8) where: e = utilization efficiency of the power plant and Wmax = maximum thermodynamically available work per kg of fluid. Wmax in equation (8) is derived from the First and Second Laws of Thermodynamics: dq = cpdT, and (9) dWmax = dq(1-To /T), (10) where: cp = specific heat of water T = resource temperature (absolute) and To = rejection temperature (absolute). For calculation of power capacity, To can be assumed to be the average ambient temperature (assumed to be 15°C). For the most efficient water-cooled binary power plants, a value of 0.45 can be assumed for utilization efficiency. From the above equations, the fluid requirement per MWe (gross) generation, not counting the parasitic load of production and injection pumps and power plant auxiliaries, can be estimated. We have considered 35 self-flowing wells tapping a reservoir at a temperature of 190°C or more. Table B1, below summarizes the important assumptions used for self-flowing wells in the following analysis. Table B1: Well depth Variable Parameters Well casing diameter below pump 95/8 inches (244.47 mm) used for analysis of self- Reservoir temperature Variable flowing wells. Static reservoir pressure Hydrostatic Gas content in water 0 Relative roughness of casing wall 0.018 cm Steam separation pressure 4.46 bar (g) Steam requirement per MWe generated 2.27 kg/s This flow behavior analysis has been conducted by numerical well-bore simulation based on the estimated PI of the well. To decide on the appropriate range of PI values to be used in this study, we calculated the PI for estimated ranges of flow capacity (Figure B1) and a skin- factor range of zero to minus one. Figure B1: Calculated Productivity Index vs. time Change in 40 Productivity Index (PI) over 35 Productivity Index (l/s/bar) time. 30 kh=100 D.m, S= -1 25 kh=100 D.m, S= 0 20 kh=70 D.m, S= -1 kh=70 D.m, S= 0 15 kh=50 D.m, S= -1 kh=50 D.m, S= 0 10 kh=30 D.m, S= -1 kh=30 D.m, S= 0 5 kh=10 D.m, S= -1 kh=10 D.m, S= 0 0 0 5 10 15 20 25 30 Time (year) Based on Figure B1, above we chose two to 30 l/s/bar as the broadest realistic range of PI for commercial wells producing from a 100°C to 250°C reservoir. Numerical well-bore simulation allows the estimation of well-head power capacity vs. flowing well-head pressure, taking into account the hydrostatic, frictional, and acceleration pressure gradients; well-bore heat loss; phase change; steam separation pressure; and steam required by the power plant per MWe. Figure B2, below is an example of the calculated “deliverability curveâ€? of a 2,743m- (9,000ft-) deep self-flowing well for a range of PI values from a 244oC reservoir. Figure B2 presents the simulated well-head pressure as a function of the total flow rate (steam plus water). 36 Success of Geothermal Wells: A Global Study Figure B2: Flowing well-head pressure vs. flow rate @ 244°C Flowing well- 25 head pressure vs. flow rate @ Well-head pressure (bar-a) o 20 244 C. 15 10 5 Productivity Index (l/s/bar) 2 6 10 30 0 0 100 200 300 400 500 600 700 Flow rate (tons/hr) From this figure and using the assumptions in Table B1, above we can estimate the net capacity of the well for various PI values given an assumed steam separation pressure and steam requirement per MWe (Figure B3, below). Similar calculations were conducted for various temperature and PI values. Figure B3: Net capacity vs. temperature for self-flowing wells Net MW 16 capacity vs. Productivity Index (l/s/bar) 14 30 temperature for self-flowing 12 10 Net capacity (MWe) wells (flash- 6 10 cycle power generation). 8 2 6 4 2 0 190 200 210 220 230 240 250 Temperature (°C) Figure B3 demonstrates that there is no upper limit to the net capacity of a self-flowing well, which is a nearly linear function of temperature, the slope of this linear trend increasing slightly with increasing PI. B.2 Power Capacity of Pumped Wells In a pumped well, the water level must lie above the pump intake to avoid pump cavitations. For any given pump-setting depth, the maximum available pressure drawdown (Δp) in a pumped well without the risk of cavitation can be estimated from: Δp = pi–(h-hp)G– psat–pgas–psuc–pfr– psm , (11) 37 where: pi = initial static reservoir pressure h = depth to production zone hp = pump setting depth G = hydrostatic pressure gradient at production temperature psat = fluid saturation pressure at production temperature pgas = gas partial pressure psuc = net positive suction head required by the pump pfr = pressure loss due to friction in well between h and hp and psm = additional safety margin to ensure that cavitation does not occur at pump intake. The pressure loss due to friction (pfr) in equation (11) can be calculated as follows: 𝑓𝑓𝑓𝑓𝑣𝑣 2 í µí±?í µí±?𝑓𝑓𝑓𝑓 = (â„Ž − â„Ží µí±?í µí±? ) (10) (12) 2í µí±”í µí±”í µí±?í µí±? where: f = Moody friction factor v = fluid velocity in the well Ï? = fluid density d = internal diameter of the well bore and gc = gravitational unit conversion factor. The maximum available pressure drawdown can be calculated from equations (11) and (12). The pump can be set as deep as 457 m (1,500 ft) if a line-shaft pump is used, but if an electric submersible pump is used it can be set considerably deeper. However, industry experience with electric submersible pumps is quite limited to date. We have assumed a maximum pump setting depth of 457 m so that either line-shaft or electric submersible pumps can be considered. The power required for pumping must be subtracted from the gross power available from the pumped well. The power required by a pump operating at the maximum allowable drawdown condition is given by: Pumping power = (W.H/Ep + hpL)/Em, (13) where: H = total delivered head L = shaft horsepower loss per unit length Ep = pump efficiency and Em = motor efficiency. In equation (13), H is given by: H = (pd – psat – pgas – psm)/G + hp , (14) Where pd = pump discharge pressure. Table B2, below lists the various parameters we have used for the analysis of pumped flow in this exercise. 38 Success of Geothermal Wells: A Global Study Table B2: Productivity Index (PI) Variable Parameters Reservoir temperature Depends on well depth used for analysis of Static reservoir pressure Hydrostatic pumped flow. Gas partial pressure 0 bar Pump-suction pressure 3.75 bar Pressure safety margin 0.68 bar Relative roughness 0.018 cm Well-casing diameter above pump 133/8â€? (339.72 mm) Well-casing diameter below pump 95/8â€? (244.47 mm) Pump discharge pressure 7.2 bar (g) Pump efficiency 0.75 Motor efficiency 0.95 Power loss per unit length of pump shaft 0 (assuming electric submersible pump) Rejection temperature 21oC Utilization factor 0.45 Figure B4, below shows an example of the calculated gross and net power capacities versus pump-setting depth for a pumped well with a PI of 10 l/s/bar and producing from a 185°C reservoir at 3,800 m deep. Figure B4: Well capacity of a pumped well vs. depth of pump Net capacity of 16 a pumped well as a function of 14 Gross capacity (MWe) pump-setting Well capacity (MWe) 12 depth. 10 8 6 Net capacity (MWe) 4 2 0 0 200 400 600 800 1,000 Depth of pump (m) The vertical separation between the gross and net capacity curves in Figure B4, above represents the parasitic power consumed. This figure shows that with increased pump- setting depth the gross and net capacities increase slowly, but the parasitic load increases rapidly. Given the practical limit of 457 m (1,500 ft) in pump-setting depth today, this well has net a generation capacity of 6.3 MWe. Figure B4 indicates that increasing the maximum possible pump-setting depth beyond 457 m and the maximum possible pumping rate beyond 160 l/s (2,500 gallons per minute) will increase the net power capacity available from a well. 39 Figure B5, below illustrates the calculated net power capacity of a pumped well vs. temperature for a range of PI values. Figure B5: Capacity (MWe) of a pumped well vs. temperature Net capacity of 9 a pumped well Productivity 8 vs. temperature Index (l/s/bar) (binary- 7 26 Net capacity (MWe) 22 cycle power 6 18 generation). 12 5 8 4 6 3 4 2 2 1 0 100 120 140 160 180 200 220 Temperature (°C) This figure shows that for any PI value the net power capacity of a well increases monotonically with temperature until it reaches a maximum at a temperature level of 190–200°C, depending on the well’s PI. After reaching this maximum, the net capacity of the well declines with increasing temperature. This decline in net capacity with temperature reflects the decline in the maximum available drawdown which, in turn, is caused by the increasing vapor pressure with temperature. Figure B5, above shows that little gain in net well capacity (MWe) can be achieved by raising the operating temperature limit of commercial pumps beyond 190°C. Figure B5 shows that irrespective of how high the PI is, a pumped well today cannot deliver significantly more than about 7.3 MWe (net). It should be noted that this maximum capacity was estimated assuming a zero gas saturation in the produced water. The higher the dissolved gas saturation in water the lower will be the available drawdown; this will reduce the maximum net power capacity of a pumped well. Figure B5, above also presents the relationship between net power capacity and PI for various temperatures. This figure shows that for any temperature level, the net capacity is very sensitive to PI when PI is low; for prolific wells the net capacity is not too sensitive to PI. B.3 Summary of Results Figure B6, below is a composite of the results for pumped and self-flowing wells. This figure shows that between 190°C and 220°C, a self-flowing well has less power capacity than the maximum net capacity of a pumped well with the same PI. If a net power capacity higher than 7.3 MWe is sought, either the pumping rate should be greater than 2,500 gpm or the reservoir temperature must be greater than about 220°C. 40 Success of Geothermal Wells: A Global Study Figure B6: Net capacity (MWe) of a well vs. temperature Productivity Index Net capacity (l/s/bar) 15 of a well vs. Upper Temperature 30 temperature. Limit of Pumps 12 10 Net capacity (MWe) Pumped Self-flowing 6 9 2 6 3 0 100 120 140 160 180 200 220 240 260 Temperature (°C) For exceptionally prolific wells this “break pointâ€? may be as low as 210°C. In other words, if the reservoir temperature is less than 220°C, the maximum available net power capacity of a geothermal well is 7.3 MWe, whether the well is pumped or self-flowing, and irrespective of how high its PI is. The only way this barrier in net power capacity can be breached is by increasing the maximum pumping rate possible from a pump and making it practically feasible to deepen the pump setting beyond 457 m (1,500 ft). However, for self-flowing wells, there appears to be no way to increase the maximum level of net power capacity beyond this 7.3 MWe limit unless reservoir temperature is greater than about 220°C. 41 ANNEX C analysis of impact of geology and resource types on well capacity (mwe) The following tables summarize the outputs from a regression analysis which attempted to determine the extent to which Geology Code and Resource Code impact the average capacity of wells. summary Regression Statistics output Multiple R 0.34 R Square 0.11 Adjusted R Square 0.11 Standard Error 5.16 Observations 1,087 analysis of df SS MS F Significance F variance Regression 9.00 3,643.11 404.79 15.19 0.00 Residual 1,077.00 28,699.78 26.65 Total 1,086.00 32,342.89 The null hypothesis for the F test is that there is no correlation between the independent and dependent variables. This result shows that we can safely reject the hypothesis and prove that at least one variable is statistically significant to the expected energy output. impact and Coefficients Standard t Stat P-value Lower 95 Upper 95 significance error percent percent of each Intercept 3.20 3.48 0.92 0.36 –3.63 10.04 independent variable Geology 1 –0.17 0.94 –0.18 0.86 –2.02 1.68 Geology 2 1.29 0.88 1.46 0.14 –0.44 3.02 Geology 3 0.28 0.68 0.41 0.68 –1.05 1.60 Geology 5 0.43 2.34 0.18 0.85 –4.16 5.02 Resource 3 –0.22 3.53 –0.06 0.95 –7.14 6.71 Resource 4 2.44 3.24 0.75 0.45 –3.91 8.79 Resource 5 1.93 3.43 0.56 0.57 –4.80 8.66 Resource 6 5.35 3.43 1.56 0.12 –1.39 12.09 Resource 7 4.01 3.44 1.17 0.24 –2.73 10.76 42 Success of Geothermal Wells: A Global Study ANNEX D Well database Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 1.1.1 1 5 12/29/1981 1 Unknown Production 6.30 12/1989 664 340 mm to 381 m Y N N 1.1.2 1 5 1982 2 Unknown Injector         N N N 1.1.3 1 5 1982 3 Unknown Injector         N N N 1.1.4 1 5 1/29/1982 4 Unknown Injector     1,231 340 mm to 431 m N N N 1.1.5 1 5 2/22/1982 5 Unknown Production 5.00   839 333 mm to 386 m Y N N 1.1.6 1 5 3/10/1982 6 Unknown Production 0.70 12/1989 405 244 mm to 297 m Y N N 1.1.7 1 5 3/29/1982 7 Unknown Production 3.70 12/1989 465 244 mm to 300 m Y N N 1.1.8 1 5 4/22/1982 8 Unknown Production 2.80   623 244 mm to 312 m Y N N 1.1.9 1 5 1985 9 Unknown Production         Y N N 1.1.10 1 5 1985 10 Unknown Abandoned         N N N 1.1.11 1 5 1985 11 Unknown Injector         N N N 1.1.12 1 5 1986 12 Unknown Injector         N N N 1.1.13 1 5 1986 13 Unknown Abandoned         N N N 1.1.14 1 5 1986 14 Unknown Production 0.00       Y N N 1.1.15 1 5 7/19/1986 15 Unknown Production 2.80   523 244 mm to 290 m Y N N 1.1.16 1 5 8/25/1986 16 Unknown Production 9.00 12/1989 715 340 mm to 318 m Y N N 1.1.17 1 5 1987 17 Unknown Injector         N N N 1.1.18 1 5 1987 18 Unknown Production 5.00 12/13/1991     Y N N 1.1.19 1 5 1987 19 Unknown Abandoned   12/13/1991     N N N 1.1.20 1 5 1987 20 Unknown Production 7.50 12/13/1991     Y Y N 1.1.21 1 5 1987 21 Unknown Injector         N N N 1.1.22 1 5 1987 22 Unknown Production 1.70       Y N N 1.1.23 1 5 1987 23 Unknown Production 3.50       Y N N 1.1.24 1 5 2/3/1987 24 Unknown Production     1,168 340 mm to 291 m Y N N 1.1.25 1 5 4/17/1987 25 Unknown Production 5.10 12/1989 810 340 mm to 311 m Y N N 1.1.26 1 5 6/10/1987 26 Unknown Production 6.90 12/1989 813 340 mm to 316 m Y N N 1.1.27 1 5 9/5/1987 27 Unknown Production 3.30 12/1989 915 340 mm to 419 m Y N N 1.1.28 1 5 10/12/1987 28 Unknown Production 2.20   1,021 244 mm to 371 m Y N N 1.1.29 1 5 11/7/1987 29 Unknown Production 2.20   640 244 mm to 299 m Y N N 1.1.30 1 5 1988 30 Unknown Abandoned   12/13/1991     N N N 1.1.31 1 5 1988 31 Unknown Production 8.70 12/13/1991     Y Y N 1.1.32 1 5 1988 32 Unknown Production 5.00 12/13/1991     Y Y N 1.1.33 1 5 1988 33 Unknown Production 2.20 12/13/1991     Y N N 1.1.34 1 5 1988 34 Unknown Production 4.20 12/13/1991     Y N N 1.1.35 1 5 1988 35 Unknown Production   12/13/1991     Y Y N 1.1.36 1 5 1988 36 Unknown Production 5.60 12/13/1991     Y N N 1.1.37 1 5 1988 37 Unknown Production 6.80 12/13/1991     Y N N 1.1.38 1 5 1988 38 Unknown Production 5.00 12/13/1991     Y N N 1.1.39 1 5 1988 39 Unknown Production 5.60 12/13/1991     Y N N 1.1.40 1 5 1988 40 Unknown Abandoned   12/13/1991     N N N 1.1.41 1 5 1988 41 Unknown Production 3.30 12/13/1991     Y N N 1.1.42 1 5 1988 42 Unknown Production 3.70 12/13/1991     Y N N 1.1.43 1 5 1988 43 Unknown Production 5.00 12/13/1991     Y N N 1.1.44 1 5 1988 44 Unknown Abandoned   12/13/1991     N N N 1.1.45 1 5 1988 45 Unknown Injector         N N N 1.1.46 1 5 1988 46 Unknown Injector         N N N 1.1.47 1 5 1988 47 Unknown Production         Y N N 1.1.48 1 5 1988 48 Unknown Injector         N N N 1.1.49 1 5 1988 49 Unknown Injector         N Y N 1.1.50 1 5 1988 50 Unknown Injector         N N N 1.1.51 1 5 1988 51 Unknown Production 4.10       Y N N 1.1.52 1 5 1988 52 Unknown Production 10.80       Y N N 1.1.53 1 5 1988 53 Unknown Production 12.40       Y N N 1.1.54 1 5 1988 54 Unknown Production 3.80       Y N N 1.1.55 1 5 1/4/1988 55 Unknown Production 9.80 12/1989 826 340 mm to 428 m Y N N 1.1.56 1 5 2/4/1988 56 Unknown Production     1,145 340 mm to 386 m Y Y N 1.1.57 1 5 2/16/1988 57 Unknown Production 5.60 12/1/1989 885 340 mm to 416 m Y N N 1.1.58 1 5 3/14/1988 58 Unknown Production 0.00   1,722 340 mm to 443 m Y N N 1.1.59 1 5 3/15/1988 59 Unknown Abandoned     1,239 340 mm to 435 m N N N 1.1.60 1 5 3/15/1988 60 Unknown Production 1.10   2,028 340 mm to 550 m Y N N 1.1.61 1 5 4/8/1988 61 Unknown Production 6.90 12/1989 662 340 mm to 362 m Y N N 1.1.62 1 5 5/3/1988 62 Unknown Unknown     2,067 340 mm to 451 m N Y N 1.1.63 1 5 5/7/1988 63 Unknown Production 3.30 12/1989 993 340 mm to 420 m Y N N 1.1.64 1 5 5/11/1988 64 Unknown Production 5.20 12/1/1989 1,304 340 mm to 543 m Y N N 1.1.65 1 5 5/31/1988 65 Unknown Injector     1,452 340 mm to 427 m N N N 1.1.66 1 5 6/9/1988 66 Unknown Production 3.80 12/1989 880 340 mm to 293 m Y Y N 1.1.67 1 5 6/24/1988 67 Unknown Production 8.10 12/1989 686 340 mm to 415 m Y N N 1.1.68 1 5 7/19/1988 68 Unknown Production 5.50 12/1989 814 340 mm to 432 m Y N N 1.1.69 1 5 8/5/1988 69 Unknown Production 8.50 12/1989 672 340 mm to 433 m Y N N 1.1.70 1 5 8/22/1988 70 Unknown Injector     2,041 340 mm to 429 m N N N 1.1.71 1 5 9/22/1988 71 Unknown Injector     2,245 340 mm to 607 m N N N 43 Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 1.1.72 1 5 10/6/1988 72 Unknown Production 4.40   1,037 340 mm to 436 m Y N N 1.1.73 1 5 12/9/1988 73 Unknown Abandoned     2,235 340 mm to 532 m N N N 1.1.74 1 5 1989 74 Unknown Abandoned   12/13/1991     N N N 1.1.75 1 5 1989 75 Unknown Abandoned   12/13/1991     N N N 1.1.76 1 5 1989 76 Unknown Production 6.10 12/13/1991     Y Y N 1.1.77 1 5 1989 77 Unknown Production 3.10       Y N N 1.1.78 1 5 1989 78 Unknown Injector   12/13/1991     N N N 1.1.79 1 5 1989 79 Unknown Production 1.90 12/13/1991     Y N N 1.1.80 1 5 1989 80 Unknown Injector 1.90 12/13/1991     Y N N 1.1.81 1 5 1989 81 Unknown Production 2.80 12/13/1991     Y N N 1.1.82 1 5 1989 82 Unknown Production 6.20 12/13/1991     Y N N 1.1.83 1 5 1989 83 Unknown Production 8.70 12/13/1991     Y N N 1.1.84 1 5 1989 84 Unknown Abandoned   12/13/1991     N Y N 1.1.85 1 5 1989 85 Unknown Production 2.50       Y N N 1.1.86 1 5 1989 86 Unknown Production 3.70 12/13/1991     Y N N 1.1.87 1 5 1989 87 Unknown Production 3.10 12/13/1991     Y N N 1.1.88 1 5 1989 88 Unknown Production 3.70 12/13/1991     Y N N 1.1.89 1 5 1989 89 Unknown Production 3.70       Y Y N 1.1.90 1 5 1989 90 Unknown Production 7.50 12/13/1991     Y N N 1.1.91 1 5 1989 91 Unknown Production 8.30       Y Y N 1.1.92 1 5 1989 92 Unknown Production 6.20       Y N N 1.1.93 1 5 1989 93 Unknown Production 3.70       Y N N 1.1.94 1 5 1989 94 Unknown Production 5.00       Y N N 1.1.95 1 5 1989 95 Unknown Production         Y N N 1.1.96 1 5 1990 96 Unknown Injector         N Y N 1.1.97 1 5 5/30/1990 97 Unknown Production     1,225 340 mm to 1,225 m Y N N 1.1.98 1 5 6/24/1990 98 Unknown Production 2.80   1,500 340 mm to 1,500 m Y Y N 1.1.99 1 5 1991 99 Unknown Production 7.20       Y N N 1.1.100 1 5 1991 100 Unknown Production 6.90 12/13/1991     Y N N 1.1.101 1 5 1991 101 Unknown Production 5.90 12/13/1991     Y Y N 1.1.102 1 5 1991 102 Unknown Production 3.90 12/13/1991     Y Y N 1.1.103 1 5 1991 103 Unknown Injector         N N N 1.1.104 1 5 1991 104 Unknown Production         Y N N 1.1.105 1 5 3/31/1991 105 Unknown Production 2.80   1,214 340 mm to 440 m Y N N 1.1.106 1 5 7/6/1991 106 Unknown Production 2.80   1,219 340 mm to 402 m Y N N 1.1.107 1 5 1992 107 Unknown Production         Y N N 1.1.108 1 5 1992 108 Unknown Production 5.60       Y N N 1.1.109 1 5 1992 109 Unknown Production 5.60       Y N N 1.1.110 1 5 1992 110 Unknown Abandoned 4.20       Y N N 1.1.111 1 5 1992 111 Unknown Injector         N N N 1.1.112 1 5 1992 112 Unknown Abandoned         N N N 1.1.113 1 5 1992 113 Unknown Abandoned         N N N 1.1.114 1 5 1992 114 Unknown Production         Y N N 1.1.115 1 5 1992 115 Unknown Production 5.60       Y N N 1.1.116 1 5 2/3/1992 116 Unknown Production 2.80   1,219 340 mm to 462 m Y N N 1.1.117 1 5 4/12/1992 117 Unknown Production 3.30   2,746 340 mm to 553 m Y N N 1.1.118 1 5 5/25/1992 118 Unknown Production 10.50   1,115 340 mm to 431 m Y N N 1.1.119 1 5 1993 119 Unknown Production 3.30       Y N N 1.1.120 1 5 1993 120 Unknown Production 5.60       Y N N 1.1.121 1 5 1993 121 Unknown Production 5.60       Y N N 1.1.122 1 5 1993 122 Unknown Injector         N N N 1.1.123 1 5 1993 123 Unknown Injector         N N N 1.1.124 1 5 1993 124 Unknown Production 2.80       Y N N 1.1.125 1 5 1994 125 Unknown Injector         N N N 1.1.126 1 5 1994 126 Unknown Abandoned 16.70       Y N N 1.1.127 1 5 1994 127 Unknown Abandoned         N N N 1.1.128 1 5 1994 128 Unknown Injector         N N N 1.1.129 1 5 1994 129 Unknown Production 5.60       Y N N 1.1.130 1 5 1995 130 Unknown Production 7.20       Y N N 1.1.131 1 5 1995 131 Unknown Production         Y N N 1.1.132 1 5 1995 132 Unknown Production         Y N N 1.1.133 1 5 1996 133 Unknown Injector         N N N 1.1.134 1 5 1996 134 Unknown Production 3.60       Y N N 1.1.135 1 5 1997 135 Unknown Injector 6.70       Y N N 1.1.136 1 5 1997 136 Unknown Injector         N N N 1.1.137 1 5 1997 137 Unknown Injector         N N N 1.1.138 1 5 1998 138 Unknown Production         Y N N 1.1.139 1 5 1998 139 Unknown Production         Y N N 1.1.140 1 5 1998 140 Unknown Production         Y N N 1.1.141 1 5 1999 141 Unknown Production         Y N N 1.1.142 1 5 2001 142 Unknown Production         Y N N 1.1.143 1 5 2003 143 Unknown Production         Y N N 1.1.144 1 5 2003 144 Unknown Injector         N N N 1.1.145 1 5 2004 145 Unknown Production         Y N N 1.1.146 1 5 2008 146 Unknown Abandoned         N N N 1.1.147 1 5 2008 147 Unknown Production         Y N N 1.1.148 1 5 2009 148 Unknown Injector         N N N 44 Success of Geothermal Wells: A Global Study Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 1.1.149 1 5 2009 149 Unknown Injector         N N N 1.1.150 1 5 2009 150 Unknown Production         Y N N 1.2.1 2 7 3/21/1943 1 Unknown Abandoned     2,160 244 mm to 766 m N N N 1.2.2 2 7 8/11/1957 2 Unknown Production 4.41   249   Y N N 1.2.3 2 7 7/1/1959 3 Unknown Production 15.00   290   Y N N 1.2.4 2 7 8/17/1959 4 Unknown Abandoned 3.76   236   Y Y N 1.2.5 2 7 9/3/1959 5 Unknown Production 6.94   285   Y N N 1.2.6 2 7 9/26/1959 6 Unknown Production 6.00   167   Y N N 1.2.7 2 7 10/22/1963 7 Unknown Idle 3.00   274   Y N N 1.2.8 2 7 11/8/1963 8 Unknown Production 4.12   663   Y N N 1.2.9 2 7 1/11/1964 9 Unknown Production 5.41   896   Y N N 1.2.10 2 7 1/29/1964 10 Unknown Production 4.24   461   Y N N 1.2.11 2 7 7/23/1964 11 Unknown Abandoned 5.12   665   Y N N 1.2.12 2 7 8/26/1964 12 Unknown Abandoned 1.65   1,442   N Y N 1.2.13 2 7 9/1/1964 13 Unknown Abandoned 2.65   1,059   N N N 1.2.14 2 7 9/7/1964 14 Unknown Production 4.06   895   Y N N 1.2.15 2 7 6/10/1965 15 Unknown Production 8.35   792   Y Y N 1.2.16 2 7 6/10/1965 16 Unknown Abandoned 5.59   1,179   Y N N 1.2.17 2 7 7/19/1965 17 Unknown Idle 7.47   1,161   Y N N 1.2.18 2 7 8/4/1965 18 Unknown Production 12.94   1,120   Y N N 1.2.19 2 7 8/8/1965 19 Unknown Abandoned 6.12   880   Y N N 1.2.20 2 7 8/13/1965 20 Unknown Abandoned 5.06   1,205   Y N N 1.2.21 2 7 8/23/1965 21 Unknown Abandoned 8.65   1,016   Y N N 1.2.22 2 7 8/29/1966 22 Unknown Abandoned 6.24   1,198   Y N N 1.2.23 2 7 10/11/1966 23 Unknown Production 9.65   1,171   Y N N 1.2.24 2 7 10/29/1966 24 Unknown Production 4.94   1,544   Y N N 1.2.25 2 7 11/15/1966 25 Unknown Abandoned 3.12   1,432   Y N N 1.2.26 2 7 7/11/1967 336 Unknown Abandoned 8.76   2,035   Y Y N 1.2.27 2 7 8/13/1967 26 Unknown Abandoned     2,492 219 mm to 1,162 m N N N 1.2.28 2 7 2/17/1968 27 Unknown Abandoned 11.06   1,260   Y N N 1.2.29 2 7 4/14/1968 28 Unknown Abandoned 9.06   1,679   Y N N 1.2.30 2 7 6/22/1968 29 Unknown Abandoned 10.24   2,051   Y N N 1.2.31 2 7 6/27/1968 30 Unknown Abandoned 1.94   2,416   N N N 1.2.32 2 7 1/28/1969 31 Unknown Abandoned 6.29   2,204   Y N N 1.2.33 2 7 2/3/1969 32 Unknown Abandoned 3.94   2,219   Y N N 1.2.34 2 7 2/10/1969 33 Unknown Abandoned 3.88   2,126   Y N N 1.2.35 2 7 2/10/1969 34 Unknown Abandoned 6.24   2,146   Y N N 1.2.36 2 7 5/5/1969 35 Unknown Production 13.00   1,356   Y N N 1.2.37 2 7 8/18/1969 36 Unknown Production 9.65   1,697   Y N N 1.2.38 2 7 9/28/1969 37 Unknown Abandoned 7.88   1,670   Y N N 1.2.39 2 7 10/27/1969 38 Unknown Production 12.24   1,580 244 mm to 764 m Y N N 1.2.40 2 7 11/14/1969 39 Unknown Injector 8.18   1,959   Y N N 1.2.41 2 7 12/3/1969 40 Unknown Injector 7.06   2,453 244 mm to 759 m Y N N 1.2.42 2 7 6/12/1970 41 Unknown Idle 12.59   1,829   Y N N 1.2.43 2 7 7/4/1970 42 Unknown Production 10.59   1,389   Y N N 1.2.44 2 7 7/20/1970 43 Unknown Injector 5.65   1,771   Y N N 1.2.45 2 7 7/25/1970 44 Unknown Production 6.59   1,484   Y N N 1.2.46 2 7 8/20/1970 45 Unknown Production 12.29   2,211   Y N N 1.2.47 2 7 9/24/1970 46 Unknown Production 9.59   1,913   Y N N 1.2.48 2 7 10/15/1970 47 Unknown Production 9.18   1,494   Y N N 1.2.49 2 7 10/15/1970 48 Unknown Production 5.76   2,296   Y N N 1.2.50 2 7 11/8/1970 49 Unknown Abandoned 3.41   2,714 178 mm to 1,737 m Y N N 1.2.51 2 7 11/10/1970 337 Unknown Production 8.29   2,085 244 mm to 754 m Y Y N 1.2.52 2 7 11/28/1970 50 Unknown Production 13.82   1,965   Y N N 1.2.53 2 7 1/7/1971 51 Unknown Production 7.35   1,678   Y N N 1.2.54 2 7 2/13/1971 52 Unknown Production 10.88   2,219   Y N N 1.2.55 2 7 2/15/1971 53 Unknown Injector 8.71   1,853   Y N N 1.2.56 2 7 3/12/1971 54 Unknown Injector 10.47   1,301   Y y N 1.2.57 2 7 4/2/1971 55 Unknown Production 15.29   1,888   Y N N 1.2.58 2 7 5/24/1971 56 Unknown Injector 5.06   2,657   Y y N 1.2.59 2 7 7/28/1971 57 Unknown Abandoned 6.71   2,076   Y y N 1.2.60 2 7 7/29/1971 58 Unknown Production 10.24   2,752   Y y N 1.2.61 2 7 8/30/1971 59 Unknown Production 19.65   1,353   Y y N 1.2.62 2 7 10/20/1971 60 Unknown Production 14.41   1,954 244 mm to 763 m Y N N 1.2.63 2 7 10/31/1971 61 Unknown Abandoned 13.35   2,179   Y N N 1.2.64 2 7 2/22/1972 62 Unknown Abandoned 12.53   2,091   Y N N 1.2.65 2 7 5/18/1972 63 Unknown Abandoned 9.82   2,195   Y N N 1.2.66 2 7 6/14/1972 338 Unknown Injector 10.35   1,312   Y Y N 1.2.67 2 7 8/27/1972 64 Unknown Abandoned 7.06   1,966   Y Y N 1.2.68 2 7 9/28/1972 65 Unknown Production 6.59   2,242   Y N N 1.2.69 2 7 10/17/1972 66 Unknown Idle 11.82   2,335   Y N N 1.2.70 2 7 12/8/1972 67 Unknown Abandoned 8.29   2,366   Y N N 1.2.71 2 7 2/8/1973 68 Unknown Abandoned 3.47   2,655   Y N N 1.2.72 2 7 6/15/1973 69 Unknown Injector 5.35   2,898   Y N N 1.2.73 2 7 6/16/1973 70 Unknown Production 9.82   2,226   Y y N 1.2.74 2 7 7/17/1973 71 Unknown Production 13.24   1,913   Y N N 1.2.75 2 7 7/27/1973 72 Unknown Production 11.88   2,306   Y N N 45 Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 1.2.76 2 7 8/31/1973 73 Unknown Injector 5.41   2,776   Y N N 1.2.77 2 7 9/14/1973 74 Unknown Idle 5.12   2,293   Y N N 1.2.78 2 7 9/17/1973 75 Unknown Production 10.71   2,166   Y N N 1.2.79 2 7 10/17/1973 76 Unknown Abandoned 8.88   2,174   Y N N 1.2.80 2 7 10/29/1973 77 Unknown Abandoned 9.06   1,881   Y N N 1.2.81 2 7 11/9/1973 78 Unknown Unknown 3.53   2,195   Y N N 1.2.82 2 7 11/16/1973 79 Unknown Production 13.06   1,665   Y N N 1.2.83 2 7 12/10/1973 80 Unknown Production 8.35   2,142 244 mm to 762 m Y N N 1.2.84 2 7 4/10/1974 81 Unknown Production 10.94   2,822   Y Y N 1.2.85 2 7 4/28/1974 82 Unknown Abandoned 7.29   2,353   Y N N 1.2.86 2 7 6/17/1974 83 Unknown Production 8.76   2,186   Y N N 1.2.87 2 7 6/18/1974 84 Unknown Production 12.88   2,191 244 mm to 762 m Y y N 1.2.88 2 7 7/16/1974 85 Unknown Production 5.00   2,743   Y N N 1.2.89 2 7 7/16/1974 86 Unknown Production 12.47   1,922   Y Y N 1.2.90 2 7 7/21/1974 87 Unknown Production 12.24   1,261   Y N N 1.2.91 2 7 8/13/1974 88 Unknown Production 7.06   2,451   Y N N 1.2.92 2 7 8/27/1974 89 Unknown Production 7.94   2,460 298 mm to 790 m Y N N 1.2.93 2 7 9/10/1974 90 Unknown Production 6.59   2,345   Y N N 1.2.94 2 7 10/6/1974 91 Unknown Abandoned 11.41   2,271   Y N N 1.2.95 2 7 10/22/1974 92 Unknown Abandoned 12.65   2,103   Y N N 1.2.96 2 7 10/26/1974 93 Unknown Abandoned 13.82   1,216   Y N N 1.2.97 2 7 11/24/1974 94 Unknown Production 5.53   2,476   Y N N 1.2.98 2 7 11/28/1974 95 Unknown Production 7.00   2,861   Y N N 1.2.99 2 7 12/31/1974 339 Unknown Injector 10.06   1,613 244 mm to 754 m Y Y N 1.2.100 2 7 1/1/1975 96 Unknown Production         Y N N 1.2.101 2 7 1975 340 Unknown Production         Y Y N 1.2.102 2 7 1/18/1975 97 Unknown Injector 12.12   2,096   Y Y N 1.2.103 2 7 2/19/1975 98 Unknown Production 9.76   1,996 244 mm to 755 m Y Y N 1.2.104 2 7 2/23/1975 99 Unknown Abandoned 2.53   2,450   N N N 1.2.105 2 7 2/24/1975 100 Unknown Abandoned 9.29   2,268   Y N N 1.2.106 2 7 3/15/1975 101 Unknown Production 6.12   2,608   Y N N 1.2.107 2 7 4/18/1975 102 Unknown Injector 13.06   2,172 298 mm to 917 m Y Y N 1.2.108 2 7 5/4/1975 103 Unknown Idle 6.88   2,371   Y Y N 1.2.109 2 7 5/5/1975 104 Unknown Abandoned 8.24   2,282   Y Y N 1.2.110 2 7 5/16/1975 105 Unknown Production 15.29   1,511   Y Y N 1.2.111 2 7 5/27/1975 106 Unknown Injector 20.29   1,875 298 mm to 916 m Y Y N 1.2.112 2 7 5/30/1975 107 Unknown Production 5.24   2,224   Y N N 1.2.113 2 7 6/16/1975 108 Unknown Abandoned 11.12   2,232   Y N N 1.2.114 2 7 6/23/1975 109 Unknown Idle 4.82   2,552   Y N N 1.2.115 2 7 6/25/1975 110 Unknown Idle 12.35   2,308 244 mm to 1,027 m Y N N 1.2.116 2 7 6/25/1975 111 Unknown Injector 5.76   3,050   Y N N 1.2.117 2 7 6/26/1975 112 Unknown Abandoned     2,509 244 mm to 1,073 m N N N 1.2.118 2 7 8/6/1975 113 Unknown Production 10.59   1,768   Y N N 1.2.119 2 7 8/15/1975 114 Unknown Injector 9.47   2,152 244 mm to 921 m Y N N 1.2.120 2 7 10/3/1975 115 Unknown Injector 6.24   2,402 244 mm to 1,063 m Y N N 1.2.121 2 7 10/14/1975 116 Unknown Production 6.53   1,320   Y N N 1.2.122 2 7 11/2/1975 341 Unknown Unknown 11.76   2,138   Y Y N 1.2.123 2 7 11/19/1975 117 Unknown Production 6.12   1,771   Y N N 1.2.124 2 7 12/30/1975 118 Unknown Production 9.18   2,100   Y Y N 1.2.125 2 7 1/29/1976 119 Unknown Unknown 15.65   1,514   Y N N 1.2.126 2 7 2/6/1976 120 Unknown Production 9.65   1,665   Y N N 1.2.127 2 7 3/9/1976 121 Unknown Production 8.82   1,931   Y N N 1.2.128 2 7 4/7/1976 122 Unknown Abandoned 12.71   2,304   Y N N 1.2.129 2 7 4/8/1976 123 Unknown Unknown 15.65   1,715   Y N N 1.2.130 2 7 4/28/1976 124 Unknown Idle     3,121 244 mm to 1,197 m N N N 1.2.131 2 7 4/30/1976 125 Unknown Production 9.06   1,726   Y Y N 1.2.132 2 7 5/14/1976 126 Unknown Unknown 7.59   1,689   Y N N 1.2.133 2 7 6/3/1976 127 Unknown Production 9.18   1,850   Y Y N 1.2.134 2 7 7/10/1976 128 Unknown Production 8.94   2,736   Y N N 1.2.135 2 7 7/13/1976 342 Unknown Abandoned 6.24   2,434 178 mm to 1,444 m Y Y N 1.2.136 2 7 7/20/1976 129 Unknown Suspended 4.71   2,734 178 mm to 1,907 m Y N N 1.2.137 2 7 7/21/1976 130 Unknown Production 6.59   2,002   Y N N 1.2.138 2 7 8/18/1976 131 Unknown Idle 9.65   2,063   Y N N 1.2.139 2 7 10/12/1976 132 Unknown Abandoned 1.47   2,843 244 mm to 1,655 m N Y N 1.2.140 2 7 12/16/1976 133 Unknown Production     2,550 244 mm to 1,603 m Y N N 1.2.141 2 7 1/1/1977 134 Unknown Abandoned         N N N 1.2.142 2 7 2/27/1977 135 Unknown Production 5.29   2,630 178 mm to 2,360 m Y Y N 1.2.143 2 7 3/3/1977 136 Unknown Unknown 7.12   2,448   Y N N 1.2.144 2 7 3/11/1977 137 Unknown Production 8.71   2,745   Y N N 1.2.145 2 7 3/19/1977 138 Unknown Production 7.94   2,348 244 mm to 1,853 m Y N N 1.2.146 2 7 4/15/1977 139 Unknown Production 10.65   1,830   Y y N 1.2.147 2 7 5/5/1977 140 Unknown Unknown 6.06   2,768   Y N N 1.2.148 2 7 6/30/1977 141 Unknown Abandoned     3,069 244 mm to 1,876 m N N N 1.2.149 2 7 8/18/1977 142 Unknown Production 11.71   2,288 244 mm to 1,273 m Y N N 1.2.150 2 7 9/2/1977 143 Unknown Injector 17.53   1,931 298 mm to 920 m Y N N 1.2.151 2 7 9/23/1977 144 Unknown Abandoned     3,216 244 mm to 2,479 m N y N 1.2.152 2 7 11/3/1977 145 Unknown Unknown 6.88   2,124   Y N N 46 Success of Geothermal Wells: A Global Study Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 1.2.153 2 7 11/9/1977 146 Unknown Injector 7.35   2,119   Y N N 1.2.154 2 7 12/4/1977 147 Unknown Unknown     3,396 244 mm to 1,828 m N N N 1.2.155 2 7 12/25/1977 148 Unknown Production 10.71   2,473   Y N N 1.2.156 2 7 1/1/1978 343 Unknown Abandoned         N Y N 1.2.157 2 7 1/11/1978 149 Unknown Idle 10.82   2,523   Y N N 1.2.158 2 7 3/29/1978 150 Unknown Production 12.18   2,220 298 mm to 888 m Y N N 1.2.159 2 7 4/1/1978 151 Unknown Production 9.29   1,698   Y N N 1.2.160 2 7 5/15/1978 152 Unknown Unknown 2.00   2,645   N N N 1.2.161 2 7 8/26/1978 153 Unknown Unknown 2.06   2,746   N N N 1.2.162 2 7 10/2/1978 154 Unknown Abandoned 6.18   2,082   Y N N 1.2.163 2 7 12/15/1978 155 Unknown Abandoned 5.59   1,896   Y N N 1.2.164 2 7 1/1/1979 156 Unknown Injector         Y N N 1.2.165 2 7 1/2/1979 157 Unknown Production 14.53   1,197 298 mm to 734 m Y N N 1.2.166 2 7 2/11/1979 344 Unknown Production 20.88   1,581 340 mm to 737 m Y Y N 1.2.167 2 7 3/6/1979 158 Unknown Production 3.59   2,140   Y N N 1.2.168 2 7 3/31/1979 159 Unknown Injector 9.82   2,114 298 mm to 865 m Y N N 1.2.169 2 7 4/23/1979 160 Unknown Abandoned 5.76   3,142 244 mm to 2,011 m Y N N 1.2.170 2 7 6/7/1979 161 Unknown Production 14.12   1,667 244 mm to 1,311 m Y N N 1.2.171 2 7 6/20/1979 162 Unknown Production 5.29   2,262   Y N N 1.2.172 2 7 7/3/1979 163 Unknown Unknown 5.53   2,054   Y N N 1.2.173 2 7 8/21/1979 164 Unknown Abandoned 6.41   2,063   Y N N 1.2.174 2 7 9/8/1979 165 Unknown Production 10.59   2,478   Y N N 1.2.175 2 7 9/12/1979 166 Unknown Unknown 1.65   2,932   N N N 1.2.176 2 7 11/26/1979 167 Unknown Abandoned     2,832 244 mm to 586 m N Y N 1.2.177 2 7 11/29/1979 168 Unknown Production 9.24   2,471 244 mm to 1,311 m Y N N 1.2.178 2 7 1/1/1980 169 Unknown Production     0   Y N N 1.2.179 2 7 1/1/1980 170 Unknown Production     2,587 244 mm to 1,668 m Y N N 1.2.180 2 7 1/26/1980 171 Unknown Production 16.12   2,244 340 mm to 924 m Y Y N 1.2.181 2 7 2/5/1980 172 Unknown Abandoned 6.88   2,491 244 mm to 1,566 m Y N N 1.2.182 2 7 4/17/1980 173 Unknown Production 13.76   2,238   Y Y N 1.2.183 2 7 4/19/1980 174 Unknown Production     2,547 244 mm to 1,350 m Y N N 1.2.184 2 7 5/23/1980 175 Unknown Abandoned 4.35   1,283   Y N N 1.2.185 2 7 6/9/1980 176 Unknown Injector 7.00   1,260   Y N N 1.2.186 2 7 6/12/1980 177 Unknown Production 15.88   1,816   Y N N 1.2.187 2 7 6/15/1980 178 Unknown Unknown 7.88   1,658   Y Y N 1.2.188 2 7 6/25/1980 179 Unknown Production 5.06   1,158   Y N N 1.2.189 2 7 6/28/1980 180 Unknown Unknown 9.06   2,587 244 mm to 1,658 m Y N N 1.2.190 2 7 7/15/1980 181 Unknown Unknown 6.59   1,655   Y N N 1.2.191 2 7 7/30/1980 182 Unknown Production 3.65   2,933 244 mm to 187 m Y N N 1.2.192 2 7 7/30/1980 183 Unknown Unknown 13.29   1,727   Y N N 1.2.193 2 7 8/1/1980 345 Unknown Production 12.53   2,348   Y Y N 1.2.194 2 7 9/5/1980 184 Unknown Production 18.71   2,078 244 mm to 1,086 m Y N N 1.2.195 2 7 9/9/1980 185 Unknown Unknown 12.06   1,795   Y N N 1.2.196 2 7 10/10/1980 186 Unknown Abandoned 2.41   2,491   N N N 1.2.197 2 7 11/5/1980 346 Unknown Production 17.24   1,929 244 mm to 969 m Y Y N 1.2.198 2 7 12/3/1980 187 Unknown Production 7.29   2,036   Y N N 1.2.199 2 7 12/29/1980 188 Unknown Unknown 8.47   2,163   Y N N 1.2.200 2 7 1/6/1981 189 Unknown Abandoned 6.53   2,184 244 mm to 914 m Y N N 1.2.201 2 7 1/16/1981 190 Unknown Injector 3.47   2,384 244 mm to 1,235 m Y N N 1.2.202 2 7 2/8/1981 191 Unknown Unknown 10.88   1,638   Y N N 1.2.203 2 7 2/15/1981 192 Unknown Abandoned 3.41   2,992 244 mm to 1,833 m Y N N 1.2.204 2 7 3/14/1981 193 Unknown Production 12.06   2,179 244 mm to 851 m Y N N 1.2.205 2 7 3/15/1981 194 Unknown Unknown 9.65   1,985   Y N N 1.2.206 2 7 4/16/1981 195 Unknown Abandoned 5.53   1,577   Y N N 1.2.207 2 7 4/21/1981 196 Unknown Unknown 24.12   1,407   Y N N 1.2.208 2 7 4/25/1981 197 Unknown Abandoned 1.71   2,968 244 mm to 1,693 m N N N 1.2.209 2 7 5/21/1981 198 Unknown Unknown 20.53   1,804   Y N N 1.2.210 2 7 6/23/1981 199 Unknown Abandoned 7.65   2,499 244 mm to 1,699 m Y N N 1.2.211 2 7 6/27/1981 200 Unknown Abandoned 5.12   2,665   Y N N 1.2.212 2 7 7/19/1981 201 Unknown Production 13.12   2,206 244 mm to 985 m Y N N 1.2.213 2 7 9/10/1981 347 Unknown Production     2,201 219 mm to 1,800 m Y Y N 1.2.214 2 7 9/13/1981 202 Unknown Abandoned 2.76   2,791 244 mm to 1,642 m N N N 1.2.215 2 7 10/7/1981 203 Unknown Production 7.41   2,504 244 mm to 1,096 m Y N N 1.2.216 2 7 11/18/1981 204 Unknown Abandoned 4.24   2,676   Y N N 1.2.217 2 7 11/22/1981 205 Unknown Production 2.88   2,641   Y Y N 1.2.218 2 7 12/1/1981 206 Unknown Abandoned 3.82   2,627 244 mm to 1,614 m Y N N 1.2.219 2 7 12/9/1981 207 Unknown Production     2,980 298 mm to 398 m Y N N 1.2.220 2 7 1/8/1982 208 Unknown Production 9.88   2,173 244 mm to 998 m Y Y N 1.2.221 2 7 1/15/1982 209 Unknown Abandoned 4.88   2,731   Y N N 1.2.222 2 7 1/29/1982 348 Unknown Injector 6.24   2,745   Y Y N 1.2.223 2 7 1/29/1982 210 Unknown Abandoned     2,987 244 mm to 2,033 m Y N N 1.2.224 2 7 3/1/1982 211 Unknown Abandoned 5.06   2,775 244 mm to 1,523 m Y Y N 1.2.225 2 7 4/22/1982 212 Unknown Production 15.94   1,182 340 mm to 814 m Y N N 1.2.226 2 7 4/24/1982 213 Unknown Production     2,547 298 mm to 1,341 m Y Y N 1.2.227 2 7 5/4/1982 214 Unknown Injector 5.82   2,851   Y N N 1.2.228 2 7 5/6/1982 349 Unknown Production 7.35   2,428 244 mm to 1,503 m Y Y N 1.2.229 2 7 6/11/1982 350 Unknown Production 9.29   1,819 340 mm to 811 m Y Y N 47 Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 1.2.230 2 7 6/11/1982 215 Unknown Production 6.94   2,623 244 mm to 2,045 m Y Y N 1.2.231 2 7 6/22/1982 216 Unknown Abandoned     2,625 298 mm to 1,684 m N Y N 1.2.232 2 7 7/5/1982 351 Unknown Production 10.59   2,595   Y Y N 1.2.233 2 7 8/8/1982 352 Unknown Production 20.12   2,343 178 mm to 1,695 m Y Y N 1.2.234 2 7 8/8/1982 353 Unknown Production 5.71   1,940 340 mm to 809 m Y Y N 1.2.235 2 7 8/9/1982 217 Unknown Abandoned 5.41   2,262   Y N N 1.2.236 2 7 8/19/1982 218 Unknown Abandoned 0.65   3,208   N N N 1.2.237 2 7 8/25/1982 354 Unknown Unknown 8.29   2,810   Y Y N 1.2.238 2 7 9/8/1982 219 Unknown Injector 7.53   2,865   Y y N 1.2.239 2 7 9/16/1982 220 Unknown Production 13.29   2,276 244 mm to 1,230 m Y N N 1.2.240 2 7 10/14/1982 355 Unknown Production 7.65   1,646 340 mm to 796 m Y Y N 1.2.241 2 7 10/19/1982 221 Unknown Abandoned 5.88   3,227 244 mm to 2,042 m Y N N 1.2.242 2 7 11/27/1982 222 Unknown Injector 5.71   2,769   Y N N 1.2.243 2 7 12/30/1982 223 Unknown Production 13.88   2,351 244 mm to 1,668 m Y N N 1.2.244 2 7 1/21/1983 356 Unknown Production 4.59   2,971 244 mm to 1,897 m Y Y N 1.2.245 2 7 2/3/1983 224 Unknown Production     2,849 244 mm to 1,490 m Y N N 1.2.246 2 7 2/15/1983 225 Unknown Abandoned     2,545 298 mm to 1,104 m N N N 1.2.247 2 7 3/9/1983 226 Unknown Production 11.06   2,861 244 mm to 1,221 m Y N N 1.2.248 2 7 3/21/1983 357 Unknown Production 5.88   2,748 244 mm to 2,005 m Y Y N 1.2.249 2 7 3/28/1983 227 Unknown Production 12.35   2,545   Y N N 1.2.250 2 7 4/10/1983 228 Unknown Production 5.71   3,080 244 mm to 1,987 m Y N N 1.2.251 2 7 5/3/1983 358 Unknown Idle 6.24   2,885 244 mm to 2,027 m Y Y N 1.2.252 2 7 5/13/1983 359 Unknown Production 11.29   2,743   Y Y N 1.2.253 2 7 5/31/1983 229 Unknown Abandoned     3,543 219 mm to 2,495 m N N N 1.2.254 2 7 6/8/1983 230 Unknown Injector 13.29   2,403 244 mm to 1,646 m Y N N 1.2.255 2 7 7/10/1983 231 Unknown Production 12.82   2,547   Y N N 1.2.256 2 7 7/27/1983 232 Unknown Production 8.00   2,754 244 mm to 2,028 m Y N N 1.2.257 2 7 8/13/1983 360 Unknown Production 8.59   2,338 244 mm to 1,209 m Y Y N 1.2.258 2 7 8/14/1983 233 Unknown Idle 2.53   2,908   N N N 1.2.259 2 7 8/23/1983 234 Unknown Production 13.88   2,321   Y N N 1.2.260 2 7 10/24/1983 235 Unknown Abandoned     2,823 298 mm to 1,655 m N N N 1.2.261 2 7 11/4/1983 236 Unknown Injector 6.00   2,886   Y Y N 1.2.262 2 7 11/8/1983 237 Unknown Injector 3.65   2,856 244 mm to 1,665 m Y N N 1.2.263 2 7 11/14/1983 238 Unknown Production 16.00   2,192 340 mm to 1,056 m Y Y N 1.2.264 2 7 11/20/1983 239 Unknown Production 12.59   2,658   Y N N 1.2.265 2 7 11/21/1983 240 Unknown Injector 11.18 2,669 244 mm to 1,287 m Y N N 1.2.266 2 7 12/22/1983 241 Unknown Production 30.29   1,796 340 mm to 1,087 m Y N N 1.2.267 2 7 12/31/1983 242 Unknown Production 12.06   2,542   Y N N 1.2.268 2 7 1984 243 Unknown Production         Y N N 1.2.269 2 7 1984 244 Unknown Production         Y N N 1.2.270 2 7 1/20/1984 245 Unknown Unknown 6.76   2,743 244 mm to 1,743 m Y N N 1.2.271 2 7 2/7/1984 246 Unknown Production 14.94   2,156 340 mm to 997 m Y N N 1.2.272 2 7 2/7/1984 247 Unknown Production 6.76   1,294 340 mm to 853 m Y N N 1.2.273 2 7 2/16/1984 248 Unknown Unknown 2.82   2,237   N N N 1.2.274 2 7 2/24/1984 249 Unknown Abandoned 2.65   3,002   N N N 1.2.275 2 7 3/26/1984 250 Unknown Production     3,577 298 mm to 2,173 m Y N N 1.2.276 2 7 4/1/1984 251 Unknown Production 14.53   2,054 244 mm to 853 m Y N N 1.2.277 2 7 4/5/1984 252 Unknown Abandoned 6.06   2,941 244 mm to 1,827 m Y N N 1.2.278 2 7 5/21/1984 361 Unknown Production 14.41   2,260 340 mm to 852 m Y Y N 1.2.279 2 7 5/25/1984 253 Unknown Production     2,514 298 mm to 2,015 m Y N N 1.2.280 2 7 6/11/1984 254 Unknown Unknown 10.53   1,682   Y Y N 1.2.281 2 7 7/5/1984 255 Unknown Production     2,790 298 mm to 1,759 m Y N N 1.2.282 2 7 7/20/1984 256 Unknown Injector 2.71   2,403 340 mm to 1,009 m N N N 1.2.283 2 7 7/29/1984 257 Unknown Idle 1.18   2,459   N N N 1.2.284 2 7 8/19/1984 258 Unknown Production 12.29   2,588 273 mm to 780 m Y N N 1.2.285 2 7 8/27/1984 259 Unknown Abandoned 3.41   2,859   Y N N 1.2.286 2 7 9/26/1984 260 Unknown Abandoned 9.29   2,752 298 mm to 1,906 m Y N N 1.2.287 2 7 10/3/1984 261 Unknown Injector 8.47   2,510 244 mm to 1,295 m Y N N 1.2.288 2 7 11/5/1984 362 Unknown Unknown 5.29   1,453   Y Y N 1.2.289 2 7 11/14/1984 262 Unknown Idle 6.18   2,861 244 mm to 2,073 m Y N N 1.2.290 2 7 11/24/1984 263 Unknown Unknown 4.82   2,736   Y N N 1.2.291 2 7 11/27/1984 363 Unknown Unknown 6.00   2,186   Y Y N 1.2.292 2 7 12/8/1984 264 Unknown Production 16.71   2,300 244 mm to 985 m Y N N 1.2.293 2 7 1985 265 Unknown Injector         Y N N 1.2.294 2 7 1985 266 Unknown Production         Y N N 1.2.295 2 7 1985 267 Unknown Injector         Y N N 1.2.296 2 7 1985 364 Unknown Production         Y Y N 1.2.297 2 7 1/2/1985 365 Unknown Suspended 3.06   3,134 244 mm to 2,094 m Y Y N 1.2.298 2 7 1/3/1985 268 Unknown Unknown 7.94   2,926 298 mm to 1,863 m Y N N 1.2.299 2 7 1/23/1985 269 Unknown Production 8.18   2,308 340 mm to 899 m Y N N 1.2.300 2 7 3/2/1985 270 Unknown Production 18.00   2,042 340 mm to 896 m Y N N 1.2.301 2 7 3/29/1985 366 Unknown Idle 7.35   2,916 244 mm to 2,039 m Y Y N 1.2.302 2 7 4/15/1985 367 Unknown Injector 5.12   2,438   Y Y N 1.2.303 2 7 5/12/1985 271 Unknown Production     1,739 340 mm to 808 m Y N N 1.2.304 2 7 5/15/1985 272 Unknown Injector 6.41   3,028 244 mm to 1,900 m Y N N 1.2.305 2 7 6/13/1985 273 Unknown Unknown 7.06   1,333   Y N N 1.2.306 2 7 7/8/1985 274 Unknown Production     2,526 244 mm to 1,344 m Y N N 48 Success of Geothermal Wells: A Global Study Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 1.2.307 2 7 7/14/1985 275 Unknown Abandoned     2,977 219 mm to 2,310 m N N N 1.2.308 2 7 7/17/1985 276 Unknown Abandoned 5.29   2,687 178 mm to 2,390 m Y N N 1.2.309 2 7 8/23/1985 277 Unknown Production     2,547 340 mm to 613 m Y N N 1.2.310 2 7 9/5/1985 278 Unknown Injector 8.47   2,572 244 mm to 1,231 m Y N N 1.2.311 2 7 10/8/1985 279 Unknown Abandoned     3,356 219 mm to 3,356 m N N N 1.2.312 2 7 10/30/1985 280 Unknown Production 7.35   3,018 244 mm to 1,981 m Y N N 1.2.313 2 7 11/8/1985 281 Unknown Production 5.18   1,850   Y N N 1.2.314 2 7 11/16/1985 282 Unknown Abandoned 4.29   2,828   Y N N 1.2.315 2 7 11/25/1985 368 Unknown Unknown 9.53   1,789   Y Y N 1.2.316 2 7 12/27/1985 283 Unknown Production 12.18   2,434 298 mm to 1,416 m Y N N 1.2.317 2 7 12/31/1985 284 Unknown Unknown 10.82   1,925   Y N N 1.2.318 2 7 1986 285 Unknown Production         Y N N 1.2.319 2 7 1986 286 Unknown Production         Y N N 1.2.320 2 7 1986 287 Unknown Production         Y N N 1.2.321 2 7 1986 288 Unknown Injector         Y Y N 1.2.322 2 7 1986 289 Unknown Production         Y N N 1.2.323 2 7 1986 290 Unknown Production         Y N N 1.2.324 2 7 1986 291 Unknown Production         Y Y N 1.2.325 2 7 1986 292 Unknown Production         Y Y N 1.2.326 2 7 1/12/1986 369 Unknown Unknown 8.47   1,689   Y Y N 1.2.327 2 7 1/18/1986 370 Unknown Unknown 11.06   1,751   Y Y N 1.2.328 2 7 1/21/1986 293 Unknown Abandoned 10.41   2,719 298 mm to 1,698 m Y Y N 1.2.329 2 7 2/7/1986 371 Unknown Unknown 10.47   2,081   Y Y N 1.2.330 2 7 2/8/1986 294 Unknown Unknown 8.53   1,681   Y Y N 1.2.331 2 7 2/12/1986 295 Unknown Idle     3,072 298 mm to 390 m N Y N 1.2.332 2 7 2/28/1986 372 Unknown Unknown 6.47   1,985   Y Y N 1.2.333 2 7 3/25/1986 373 Unknown Unknown 10.41   2,314   Y Y N 1.2.334 2 7 3/26/1986 296 Unknown Abandoned 6.94   2,896 298 mm to 1,977 m Y Y N 1.2.335 2 7 3/28/1986 297 Unknown Production 11.47   2,657 298 mm to 1,686 m Y N N 1.2.336 2 7 3/31/1986 374 Unknown Unknown 8.24   1,896   Y Y N 1.2.337 2 7 4/5/1986 298 Unknown Unknown 12.65   2,121   Y N N 1.2.338 2 7 4/15/1986 299 Unknown Idle     3,051 273 mm to 578 m N N N 1.2.339 2 7 4/15/1986 300 Unknown Production     3,266 298 mm to 498 m Y N N 1.2.340 2 7 5/13/1986 301 Unknown Unknown 11.65   2,029   Y N N 1.2.341 2 7 5/14/1986 302 Unknown Unknown 12.12   1,821   Y N N 1.2.342 2 7 5/31/1986 303 Unknown Production 12.41   2,733 298 mm to 1,622 m Y N N 1.2.343 2 7 7/2/1986 304 Unknown Unknown 9.53   1,992   Y N N 1.2.344 2 7 7/3/1986 305 Unknown Unknown 3.65   2,225   Y N N 1.2.345 2 7 7/9/1986 375 Unknown Unknown 11.71   2,649 298 mm to 1,838 m Y Y N 1.2.346 2 7 7/13/1986 306 Unknown Production     2,081 340 mm to 1,049 m Y N N 1.2.347 2 7 7/27/1986 307 Unknown Production     2,094 340 mm to 977 m Y N N 1.2.348 2 7 12/21/1986 308 Unknown Production     2,915 244 mm to 701 m Y N N 1.2.349 2 7 1987 309 Unknown Production         Y N N 1.2.350 2 7 1987 310 Unknown Production         Y Y N 1.2.351 2 7 1987 311 Unknown Production         Y N N 1.2.352 2 7 1987 312 Unknown Production         Y Y N 1.2.353 2 7 1987 313 Unknown Production         Y Y N 1.2.354 2 7 4/9/1987 314 Unknown Abandoned 4.10 1995 2,542 340 mm to 1,208 m Y N N 1.2.355 2 7 5/17/1987 315 Unknown Abandoned 3.70 1995 3,194 298 mm to 1,771 m Y N N 1.2.356 2 7 6/2/1987 316 Unknown Production     2,446 340 mm to 1,361 m Y N N 1.2.357 2 7 6/30/1987 317 Unknown Injector     2,896 244 mm to 1,676 m Y N N 1.2.358 2 7 8/18/1987 318 Unknown Production         Y N N 1.2.359 2 7 8/20/1987 319 Unknown Production     3,035 244 mm to 671 m Y N N 1.2.360 2 7 8/20/1987 320 Unknown Unknown 4.00 1995 2,936 273 mm to 1,284 m Y N N 1.2.361 2 7 8/20/1987 321 Unknown Injector 2.30 1995 3,265 340 mm to 1,223 m N N N 1.2.362 2 7 10/22/1987 322 Unknown Abandoned 2.80 1995 2,868 298 mm to 1,622 m N N N 1.2.363 2 7 10/29/1987 323 Unknown Idle     2,564 340 mm to 1,273 m N N N 1.2.364 2 7 6/14/1988 324 Unknown Injector     2,954 219 mm to 2,726 m Y N N 1.2.365 2 7 1/18/1989 325 Unknown Abandoned     2,887 244 mm to 1,996 m N N N 1.2.366 2 7 2/15/1990 326 Unknown Production     2,932 298 mm to 1,889 m Y N N 1.2.367 2 7 9/21/1992 327 Unknown Unknown     3,027 244 mm to 2,457 m N N N 1.2.368 2 7 12/31/1992 328 Unknown Production     3,165 244 mm to 2,355 m Y N N 1.2.369 2 7 2/12/1993 329 Unknown Idle     3,353 114 mm to 3,267 m N N N 1.2.370 2 7 4/22/1993 330 Unknown Production     3,458 244 mm to 2,451 m Y N N 1.2.371 2 7 7/7/1993 331 Unknown Idle     3,233 298 mm to 1,633 m N N N 1.2.372 2 7 8/26/1993 376 Unknown Injector 1.70 1995 3,055 244 mm to 1,982 m N Y N 1.2.373 2 7   332 Unknown Abandoned 3.53       Y N N 1.2.374 2 7   377 Unknown Unknown 6.76       Y Y N 1.2.375 2 7   333 Unknown Unknown 5.47       Y N N 1.2.376 2 7   334 Unknown Unknown 9.12       Y N N 1.2.377 2 7   335 Unknown Unknown 8.76       Y N N 1.2.378 2 7   378 Unknown Unknown 2.65       N Y N 1.3.1 4 3 1945 1 Unknown Unknown         N Y N 1.3.2 4 3 1970 2 Unknown Unknown     1,843 219 mm to 1,836 m N Y N 1.3.3 4 3 1970 3 Unknown Unknown     1,230 73 mm to 1,219 m N Y N 1.3.4 4 3 1970 4 Unknown Unknown     2,174 244 mm to 1,367 m N N N 1.3.5 4 3 1972 5 Unknown Injector     1,524 219 mm to 1,507 m Y N N 49 Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 1.3.6 4 3 1974 6 Unknown Injector         Y N N 1.3.7 4 3 9/4/1982 7 Unknown Production 0.40   1,982 244 mm to 2,056 m Y N N 1.3.8 4 3 9/20/1982 8 Unknown Production 1.10   1,415 244 mm to 1,413 m Y N N 1.3.9 4 3 11/9/1982 9 Unknown Production 0.40   3,304 244 mm to 3,302 m Y N N 1.3.10 4 3 1984 10 Unknown Injector         Y N N 1.3.11 4 3 2/2/1984 11 Unknown Production 1.40   2,225 273 mm to 1,373 m Y N N 1.3.12 4 3 2/16/1984 12 Unknown Injector     3,276 273 mm to 2,467 m Y N Y 1.3.13 4 3 3/18/1984 13 Unknown Production 5.20   1,622 244 mm to 1,605 m Y N Y 1.3.14 4 3 4/15/1984 14 Unknown Production 0.70   2,286 273 mm to 1,388 m Y Y N 1.3.15 4 3 5/15/1984 15 Unknown Injector     2,060 273 mm to 1,254 m Y N Y 1.3.16 4 3 6/5/1984 16 Unknown Injector     1,439 244 mm to 1,439 m Y N Y 1.3.17 4 3 6/13/1984 17 Unknown Production 2.20   1,941 273 mm to 1,344 m Y N N 1.3.18 4 3 7/20/1984 18 Unknown Injector     2,225 244 mm to 2,324 m Y N Y 1.3.19 4 3 8/11/1984 19 Unknown Injector     2,030 244 mm to 2,030 m Y N Y 1.3.20 4 3 8/11/1984 20 Unknown Production 3.90   2,088 273 mm to 1,309 m Y N N 1.3.21 4 3 8/31/1984 21 Unknown Injector     1,595 244 mm to 1,595 m Y N Y 1.3.22 4 3 9/27/1984 22 Unknown Injector     1,467 273 mm to 1,465 m Y Y N 1.3.23 4 3 10/2/1984 23 Unknown Injector     1,920 244 mm to 3,172 m Y N N 1.3.24 4 3 10/20/1984 24 Unknown Injector     2,039 273 mm to 2,039 m Y N N 1.3.25 4 3 10/21/1984 25 Unknown Injector     1,974 273 mm to 1,991 m Y N N 1.3.26 4 3 11/4/1984 26 Unknown Injector     1,382 194 mm to 487 m Y N N 1.3.27 4 3 11/6/1984 27 Unknown Injector     1,372 273 mm to 1,368 m Y Y N 1.3.28 4 3 11/25/1984 28 Unknown Injector     2,050 273 mm to 2,049 m Y Y N 1.3.29 4 3 12/1/1984 29 Unknown Injector     2,045 273 mm to 2,040 m Y N N 1.3.30 4 3 12/9/1984 30 Unknown Injector     1,455 273 mm to 1,453 m Y N N 1.3.31 4 3 12/17/1984 31 Unknown Injector     1,441 273 mm to 1,430 m Y N N 1.3.32 4 3 1985 32 Unknown Production 1.90       Y Y N 1.3.33 4 3 1/4/1985 33 Unknown Injector     1,471 273 mm to 1,466 m Y Y N 1.3.34 4 3 1/30/1985 34 Unknown Injector     1,376 178 mm to 1,373 m Y N N 1.3.35 4 3 1/25/1986 35 Unknown Injector     2,034 273 mm to 2,033 m Y N N 1.3.36 4 3 6/30/1986 36 Unknown Production 1.60   1,640 244 mm to 1,637 m Y N N 1.3.37 4 3 10/19/1986 37 Unknown Injector     2,114 273 mm to 2,113 m Y N N 1.3.38 4 3 11/17/1986 38 Unknown Injector     2,113 273 mm to 2,113 m Y N N 1.3.39 4 3 12/8/1986 39 Unknown Injector     3,283 244 mm to 2,612 m Y N Y 1.3.40 4 3 12/18/1986 40 Unknown Production 0.80   2,897 244 mm to 2,889 m Y N N 1.3.41 4 3 1987 41 Unknown Injector     2,940 244 mm to 2,202 m Y N N 1.3.42 4 3 1/30/1987 42 Unknown Injector     1,911 273 mm to 1,910 m Y N N 1.3.43 4 3 4/10/1987 43 Unknown Injector     2,743 244 mm to 2,526 m Y Y N 1.3.44 4 3 4/18/1987 44 Unknown Production 3.40   1,640 244 mm to 1,637 m Y Y N 1.3.45 4 3 5/20/1987 45 Unknown Injector     1,751 273 mm to 1,750 m Y Y N 1.3.46 4 3 1992 46 Unknown Production 5.20       Y N Y 1.3.47 4 3 1993 47 Unknown Production 5.10       Y N Y 1.3.48 4 3 1993 48 Unknown Production 4.80       Y N Y 1.3.49 4 3 1993 49 Unknown Production 5.80       Y N Y 1.3.50 4 3 1993 50 Unknown Production 6.70       Y N Y 1.3.51 4 3 1993 51 Unknown Production 5.20       Y N Y 1.3.52 4 3 1993 52 Unknown Production 6.30       Y N Y 1.3.53 4 3 1993 53 Unknown Production 4.90       Y Y Y 1.3.54 4 3 1993 54 Unknown Production 5.50       Y N Y 1.3.55 4 3 1993 55 Unknown Production 4.70       Y N Y 1.3.56 4 3 1993 56 Unknown Injector         Y N N 1.3.57 4 3 1993 57 Unknown Injector         Y N N 1.3.58 4 3 1993 58 Unknown Injector         Y N N 1.3.59 4 3 2005 59 Unknown Production         Y N Y 1.3.60 4 3 2006 60 Unknown Injector         Y N N 1.3.61 4 3 2006 61 Unknown Injector         Y N N 1.3.62 4 3 2006 62 Unknown Injector         Y N N 1.3.63 4 3 2006 63 Unknown Production         Y N Y 1.3.64 4 3 2006 64 Unknown Abandoned         N N N 1.3.65 4 3 2006 65 Unknown Injector         Y N N 1.3.66 4 3 2007 66 Unknown Injector         Y Y N 1.3.67 4 3 2007 67 Unknown Production         Y Y Y 1.3.68 4 3 2007 68 Unknown Production         Y Y Y 1.3.69 4 3 2009 69 Unknown Production         Y N Y 1.3.70 4 3 2010 70 Unknown Production         Y N Y 1.4.1 4 6 1932 1 Unknown Unknown 8.30   321 340 mm to 172 m Y N N 1.4.2 4 6 1962 2 Unknown Abandoned     1,594 340 mm to 159 m NA N N 1.4.3 4 6 1963 3 Unknown Abandoned     1,776 340 mm to 243 m NA N N 1.4.4 4 6 1963 4 Unknown Abandoned     2,110   NA N N 1.4.5 4 6 1964 5 Unknown Abandoned     1,615 340 mm to 173 m NA N N 1.4.6 4 6 1964 6 Unknown Abandoned     1,478 340 mm to 169 m NA N N 1.4.7 4 6 1965 7 Unknown Abandoned     518 273 mm to 469 m NA N N 1.4.8 4 6 1965 8 Unknown Abandoned 8.30   720 340 mm to 185 m Y N N 1.4.9 4 6 1/21/1972 9 Production Abandoned         Y N N 1.4.10 4 6 3/1/1972 10 Unknown Abandoned 8.30   1,064 340 mm to 185 m Y N N 1.4.11 4 6 12/19/1978 11 Injector Injector 5.60       Y Y N 1.4.12 4 6 1/24/1979 12 Production Injector         Y N N 50 Success of Geothermal Wells: A Global Study Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 1.4.13 4 6 2/15/1979 13 Injector Injector 5.60       Y N N 1.4.14 4 6 2/18/1979 14 Injector Abandoned 8.30   450   Y N N 1.4.15 4 6 1981 15 Unknown Abandoned 4.10       Y N N 1.4.16 4 6 3/16/1981 16 Production Abandoned     914   Y N N 1.4.17 4 6 4/15/1981 17 Production Observation 8.30       Y N N 1.4.18 4 6 9/6/1981 18 Injector Abandoned 8.30       Y Y N 1.4.19 4 6 12/26/1981 19 Production Abandoned         Y Y N 1.4.20 4 6 1/1/1982 20 Injector Injector         Y N N 1.4.21 4 6 1/17/1982 21 Production Abandoned         Y N N 1.4.22 4 6 4/15/1982 22 Production Injector         Y N N 1.4.23 4 6 10/25/1982 23 Production Injector         Y Y N 1.4.24 4 6 3/22/1983 24 Production Production 8.30       Y Y N 1.4.25 4 6 1984 25 Production Abandoned         Y N N 1.4.26 4 6 1984 26 Unknown Abandoned         NA N N 1.4.27 4 6 1984 27 Unknown Injector 8.30     340 mm to NA Y Y N 1.4.28 4 6 10/16/1984 28 Production Injector     1,186   Y N N 1.4.29 4 6 11/15/1984 29 Production Abandoned     1,227   Y N N 1.4.30 4 6 11/27/1984 30 Production Abandoned     1,067   Y N N 1.4.31 4 6 12/6/1984 31 Production Abandoned     1,211   Y N N 1.4.32 4 6 12/14/1984 32 Production Abandoned     1,204   Y N N 1.4.33 4 6 12/15/1984 33 Injector Abandoned 5.60   1,067   Y N N 1.4.34 4 6 1/1/1985 34 Production Production         Y N N 1.4.35 4 6 1/4/1985 35 Production Abandoned     1,383   Y N N 1.4.36 4 6 1/17/1985 36 Injector Injector     1,133   Y N N 1.4.37 4 6 1/17/1985 37 Production Abandoned         Y N N 1.4.38 4 6 2/5/1985 38 Injector Injector     1,191   Y N N 1.4.39 4 6 2/5/1985 39 Production Production         Y N N 1.4.40 4 6 2/7/1985 40 Injector Abandoned     1,195   Y N N 1.4.41 4 6 2/24/1985 41 Injector Abandoned     1,067   Y N N 1.4.42 4 6 1986 42 Unknown Abandoned     3,220   NA N N 1.4.43 4 6 7/24/1986 43 Production Production 31.68 2004   406 mm to NA Y N N 1.4.44 4 6 10/17/1986 44 Production Abandoned     1,485   Y N N 1.4.45 4 6 1987 45 Unknown Abandoned         NA N N 1.4.46 4 6 1987 46 Unknown Abandoned         NA N N 1.4.47 4 6 5/3/1987 47 Production Injector     2,664   Y N N 1.4.48 4 6 8/2/1987 48 Production Abandoned 2.80       Y Y N 1.4.49 4 6 10/17/1987 49 Production Abandoned         Y N N 1.4.50 4 6 11/14/1987 50 Production Abandoned         Y N N 1.4.51 4 6 12/19/1987 51 Production Injector         Y N N 1.4.52 4 6 1988 52 Production Production 12.24 2004   273 mm to NA Y N N 1.4.53 4 6 1/12/1988 53 Injector Abandoned         Y N N 1.4.54 4 6 1/16/1988 54 Production Abandoned         Y Y N 1.4.55 4 6 1/18/1988 55 Production Abandoned         Y N N 1.4.56 4 6 3/1/1988 56 Injector Injector         Y N N 1.4.57 4 6 3/2/1988 57 Injector Injector         Y N N 1.4.58 4 6 3/7/1988 58 Non-commercial Abandoned         Y Y N 1.4.59 4 6 3/9/1988 59 Injector Injector         Y N N 1.4.60 4 6 4/1/1988 60 Production Production         Y Y N 1.4.61 4 6 4/4/1988 61 Production Abandoned         Y N N 1.4.62 4 6 4/10/1988 62 Production Abandoned 2.80       Y Y N 1.4.63 4 6 4/16/1988 63 Injector Injector         Y N N 1.4.64 4 6 4/21/1988 64 Injector Injector         Y N N 1.4.65 4 6 5/29/1988 65 Injector Unknown         Y Y N 1.4.66 4 6 5/31/1988 66 Injector Injector         Y N N 1.4.67 4 6 6/10/1988 67 Production Idle         Y N N 1.4.68 4 6 6/16/1988 68 Production Abandoned         Y N N 1.4.69 4 6 7/8/1988 69 Injector Injector         Y N N 1.4.70 4 6 8/4/1988 70 Injector Injector         Y N N 1.4.71 4 6 8/10/1988 71 Production Production         Y N N 1.4.72 4 6 8/17/1988 72 Injector Injector 2.80       N N N 1.4.73 4 6 9/8/1988 73 Production Abandoned 2.80       Y N N 1.4.74 4 6 9/8/1988 74 Production Production         Y Y N 1.4.75 4 6 10/26/1988 75 Injector Injector         Y N N 1.4.76 4 6 10/31/1988 76 Production Production 2.80       Y N N 1.4.77 4 6 11/2/1988 77 Non-commercial Production 2.80       Y N N 1.4.78 4 6 11/26/1988 78 Injector Unknown 2.80       N Y N 1.4.79 4 6 2/22/1989 79 Injector Injector         N N N 1.4.80 4 6 3/6/1989 80 Production Production 6.12 2004   273 mm to NA Y N N 1.4.81 4 6 3/18/1989 81 Non-commercial Abandoned 3.90       Y N N 1.4.82 4 6 3/25/1989 82 Production Production         Y Y N 1.4.83 4 6 4/6/1989 83 Production Production 8.30       Y N N 1.4.84 4 6 5/8/1989 84 Injector Injector 2.80       N N N 1.4.85 4 6 5/12/1989 85 Production Production 2.80     273 mm to NA Y N N 1.4.86 4 6 5/16/1989 86 Production Production         Y N N 1.4.87 4 6 7/9/1989 87 Production Unknown         Y Y N 1.4.88 4 6 7/29/1989 88 Injector Injector         Y N N 1.4.89 4 6 7/29/1989 89 Injector Injector         Y N N 51 Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 1.4.90 4 6 9/14/1989 90 Injector Unknown         Y Y N 1.4.91 4 6 9/19/1989 91 Injector Injector         Y N N 1.4.92 4 6 10/18/1989 92 Injector Unknown         Y Y N 1.4.93 4 6 11/17/1989 93 Injector Unknown         Y Y N 1.4.94 4 6 12/29/1989 94 Injector Injector         Y N N 1.4.95 4 6 1990 95 Production Abandoned         Y N N 1.4.96 4 6 1990 96 Unknown Abandoned         N N N 1.4.97 4 6 5/29/1990 97 Unknown Unknown         NA Y N 1.4.98 4 6 8/6/1990 98 Unknown Unknown         NA N N 1.4.99 4 6 9/5/1990 99 Production Production         Y Y N 1.4.100 4 6 1991 100 Unknown Production         Y N N 1.4.101 4 6 1/20/1991 101 Production Production     1,186   Y Y N 1.4.102 4 6 2/6/1991 102 Injector Injector         Y N N 1.4.103 4 6 3/11/1991 103 Injector Unknown         Y Y N 1.4.104 4 6 4/29/1991 104 Production Production 19.62 2004   340 mm to NA Y N N 1.4.105 4 6 4/30/1991 105 Production Production 10.26 2004   340 mm to NA Y N N 1.4.106 4 6 5/27/1991 106 Production Production         Y Y N 1.4.107 4 6 11/20/1991 107 Production Production     1,211   Y Y N 1.4.108 4 6 2/20/1992 108 Production Production         Y N N 1.4.109 4 6 4/25/1992 109 Production Production         Y N N 1.4.110 4 6 6/2/1992 110 Production Production         Y Y N 1.4.111 4 6 7/16/1992 111 Production Abandoned         Y N N 1.4.112 4 6 1/22/1993 112 Injector Injector         Y N N 1.4.113 4 6 2/15/1993 113 Production Production     1,199   Y Y N 1.4.114 4 6 5/9/1993 114 Production Production         Y Y N 1.4.115 4 6 5/10/1993 115 Production Abandoned         Y Y N 1.4.116 4 6 10/25/1993 116 Injector Unknown         Y Y N 1.4.117 4 6 1/1/1994 117 Unknown Injector     2,172   NA N N 1.4.118 4 6 3/11/1994 118 Injector Unknown         Y Y N 1.4.119 4 6 4/14/1994 119 Production Production         Y Y N 1.4.120 4 6 10/22/1994 120 Production Production         Y Y N 1.4.121 4 6 1995 121 Unknown Production         Y N N 1.4.122 4 6 1995 122 Unknown Production 20.07 2004   340 mm to NA Y N N 1.4.123 4 6 1995 123 Unknown Injector         Y N N 1.4.124 4 6 1995 124 Unknown Injector     2,211   Y N N 1.4.125 4 6 1996 125 Unknown Injector     2,256   Y N N 1.4.126 4 6 1996 126 Unknown Production 23.76 2004 0 340 mm to NA Y N N 1.4.127 4 6 1996 127 Unknown Production 20.61 2004   340 mm to NA Y N N 1.4.128 4 6 1997 128 Unknown Production 22.05 2004   340 mm to NA Y N N 1.4.129 4 6 1997 129 Unknown Production         Y N N 1.4.130 4 6 1997 130 Unknown Injector     2,558   Y N N 1.4.131 4 6 1998 131 Unknown Production 9.81 2004   273 mm to NA Y N N 1.4.132 4 6 1998 132 Unknown Injector     2,177   Y N N 1.4.133 4 6 1998 133 Unknown Injector     2,484   Y N N 1.4.134 4 6 1999 134 Unknown Production 17.64 2004   340 mm to NA Y N N 1.4.135 4 6 2001 135 Unknown Production 8.91 2004   340 mm to NA Y N N 1.4.136 4 6 2001 136 Unknown Production 18.99 2004   340 mm to NA Y N N 1.4.137 4 6 2002 137 Unknown Injector         Y N N 1.4.138 4 6 2003 138 Unknown Injector         Y N N 1.4.139 4 6 2008 139 Unknown Production         Y N N 1.4.140 4 6 2009 140 Unknown Injector         Y N N 1.4.141 4 6   141 Unknown Unknown 9.81 2004   273 mm to NA Y Y N 1.4.142 4 6   142 Unknown Unknown 21.15 2004   340 mm to NA Y Y N 1.4.143 4 6   143 Unknown Unknown 6.03 2004   244 mm to NA Y Y N 1.4.144 4 6   144 Unknown Unknown 6.21 2004   244 mm to NA Y Y N 1.4.145 4 6   145 Injector Unknown         Y Y N 1.4.146 4 6   146 Unknown Unknown     1,947   NA Y N 1.4.147 4 6   147 Production Production 5.76 2004   244 mm to NA Y Y N 1.4.148 4 6   148 Production Production 16.92 2004   298 mm to NA Y Y N 1.5.1 4 3 1972 1 Unknown Injector         N N N 1.5.2 4 3 1974 2 Unknown Injector         Y N N 1.5.3 4 3 1974 3 Unknown Injector     1,829   Y N N 1.5.4 4 3 1974 4 Unknown Abandoned         N N N 1.5.5 4 3 1975 5 Unknown Injector 2.40       N N N 1.5.6 4 3 1975 6 Unknown Production 1.40       Y N Y 1.5.7 4 3 1976 7 Unknown Injector         Y N N 1.5.8 4 3 1976 8 Unknown Injector     2,234 244 mm to 1,569 m Y N N 1.5.9 4 3 1976 9 Unknown Abandoned     2,293 244 mm to 1,605 m NA N N 1.5.10 4 3 1977 10 Unknown Production 1.40       Y N Y 1.5.11 4 3 1977 11 Unknown Abandoned     943 340 mm to 657 m NA N N 1.5.12 4 3 1977 12 Unknown Injector         Y N N 1.5.13 4 3 1977 13 Unknown Production 2.40       Y N Y 1.5.14 4 3 1978 14 Unknown Injector     2,131 244 mm to 1,570 m Y Y N 1.5.15 4 3 1978 15 Unknown Injector     2,050 244 mm to 1,569 m Y Y N 1.5.16 4 3 1978 16 Unknown Abandoned     1,967 340 mm to 687 m NA Y N 1.5.17 4 3 1978 17 Unknown Abandoned     2,079 244 mm to 1,584 m NA Y N 1.5.18 4 3 1978 18 Unknown Injector 1.00       N N N 52 Success of Geothermal Wells: A Global Study Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 1.5.19 4 3 1979 19 Unknown Injector         Y N N 1.5.20 4 3 1979 20 Unknown Production 1.40       Y N Y 1.5.21 4 3 1979 21 Unknown Production 1.00       Y N Y 1.5.22 4 3 1983 22 Unknown Injector     2,982 244 mm to 1,372 m Y N N 1.5.23 4 3 1984 23 Unknown Injector     2,325 244 mm to 618 m Y N N 1.5.24 4 3 1984 24 Unknown Production 3.20   2,408 178 mm to 2,281 m Y N Y 1.5.25 4 3 1985 25 Unknown Injector     2,336 178 mm to 1,362 m Y N N 1.5.26 4 3 1985 26 Unknown Production     1,783 178 mm to 1,211 m Y N Y 1.5.27 4 3 1985 27 Unknown Injector     1,737 178 mm to 1,211 m N N N 1.5.28 4 3 1986 28 Unknown Production 1.90       Y N Y 1.5.29 4 3 1986 29 Unknown Injector 2.00       N N N 1.5.30 4 3 1987 30 Unknown Production 2.50       Y N Y 1.5.31 4 3 1987 31 Unknown Production 3.50       Y N Y 1.5.32 4 3 1987 32 Unknown Injector 2.80       N N N 1.5.33 4 3 1987 33 Unknown Injector     3,266 244 mm to 2,505 m N N N 1.5.34 4 3 1987 34 Unknown Injector 3.60       Y N N 1.5.35 4 3 1987 35 Unknown Injector 2.90       N N N 1.5.36 4 3 1987 36 Unknown Production 4.10       Y N Y 1.5.37 4 3 1987 37 Unknown Injector         Y N N 1.5.38 4 3 1987 38 Unknown Injector         Y N N 1.5.39 4 3 1987 39 Unknown Injector         Y N N 1.5.40 4 3 1987 40 Unknown Production 2.20       Y N Y 1.5.41 4 3 1987 41 Unknown Injector         Y N N 1.5.42 4 3 1987 42 Unknown Production 3.30       Y N Y 1.5.43 4 3 1987 43 Unknown Injector         Y N N 1.5.44 4 3 1987 44 Unknown Injector         Y N N 1.5.45 4 3 1987 45 Unknown Production 3.40       Y N Y 1.5.46 4 3 1987 46 Unknown Production         Y N N 1.5.47 4 3 1987 47 Unknown Production         Y N N 1.5.48 4 3 1988 48 Unknown Abandoned 3.00       Y N N 1.5.49 4 3 1988 49 Unknown Injector         Y N N 1.5.50 4 3 1988 50 Unknown Production 2.80   2,134 340 mm to 1,061 m Y N Y 1.5.51 4 3 1988 51 Unknown Production 3.20   2,220 340 mm to 1,279 m Y N Y 1.5.52 4 3 1988 52 Unknown Production 3.20   2,141 340 mm to 1,107 m Y N Y 1.5.53 4 3 1988 53 Unknown Production 2.90       Y N Y 1.5.54 4 3 1988 54 Unknown Injector 3.30   2,169 340 mm to 1,326 m Y N N 1.5.55 4 3 1988 55 Unknown Injector 3.70       Y N N 1.5.56 4 3 1988 56 Unknown Injector     2,206 244 mm to 1,283 m Y N N 1.5.57 4 3 1988 57 Unknown Injector         Y N N 1.5.58 4 3 1988 58 Unknown Injector         Y N N 1.5.59 4 3 1988 59 Unknown Injector 2.60   2,357 340 mm to 1,212 m N N N 1.5.60 4 3 1988 60 Unknown Production 3.30       Y N Y 1.5.61 4 3 1988 61 Unknown Injector         Y N N 1.5.62 4 3 1988 62 Unknown Injector         Y N N 1.5.63 4 3 1988 63 Unknown Production 3.40   1,972 340 mm to 996 m Y N Y 1.5.64 4 3 1988 64 Unknown Injector         Y N N 1.5.65 4 3 1988 65 Unknown Production 3.00   2,211 340 mm to 914 m Y N Y 1.5.66 4 3 1988 66 Unknown Production 2.80   2,362 340 mm to 201 m Y N Y 1.5.67 4 3 1988 67 Unknown Production 3.20   2,252 340 mm to 1,404 m Y N Y 1.5.68 4 3 1988 68 Unknown Production 2.80   2,320 340 mm to 1,438 m Y N Y 1.5.69 4 3 1988 69 Unknown Injector     1,997 244 mm to 1,220 m Y N N 1.5.70 4 3 1988 70 Unknown Production         Y N Y 1.5.71 4 3 1988 71 Unknown Production         Y N Y 1.5.72 4 3 1989 72 Unknown Injector     2,058 244 mm to 1,161 m Y N N 1.5.73 4 3 1989 73 Unknown Injector     1,981 244 mm to 762 m Y N N 1.5.74 4 3 1989 74 Unknown Injector         Y N N 1.5.75 4 3 1989 75 Unknown Injector         Y N N 1.5.76 4 3 1989 76 Unknown Injector     1,981 244 mm to 762 m Y N N 1.5.77 4 3 1989 77 Unknown Injector         Y N N 1.5.78 4 3 1989 78 Unknown Injector         Y N N 1.5.79 4 3 1989 79 Unknown Production 3.90   2,162 340 mm to 1,347 m Y N Y 1.5.80 4 3 1989 80 Unknown Injector 3.70       Y N N 1.5.81 4 3 1989 81 Unknown Injector 2.90   1,966 340 mm to 1,042 m N N N 1.5.82 4 3 1989 82 Unknown Injector         Y N N 1.5.83 4 3 1989 83 Unknown Production 3.70       Y N Y 1.5.84 4 3 1989 84 Unknown Injector 3.30       Y N N 1.5.85 4 3 1990 85 Unknown Injector     1,865 244 mm to 773 m Y N N 1.5.86 4 3 1990 86 Unknown Production 2.20   2,034 340 mm to 1,081 m Y N Y 1.5.87 4 3 1990 87 Unknown Production 1.30   1,962 340 mm to 287 m Y Y Y 1.5.88 4 3 1990 88 Unknown Injector     1,930 244 mm to 822 m Y N N 1.5.89 4 3 1991 89 Unknown Injector         Y N N 1.5.90 4 3 1992 90 Unknown Injector         Y N N 1.5.91 4 3 1992 91 Unknown Injector     1,679 340 mm to 824 m Y Y N 1.5.92 4 3 1992 92 Unknown Abandoned     1,948 340 mm to 913 m NA N N 1.5.93 4 3 1993 93 Unknown Production 3.20       Y N Y 1.5.94 4 3 1993 94 Unknown Production 2.90       Y N Y 1.5.95 4 3 1995 95 Unknown Injector         N N N 53 Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 1.5.96 4 3 1995 96 Unknown Production         Y N Y 1.5.97 4 3 1995 97 Unknown Production 2.80       Y N Y 1.5.98 4 3 1996 98 Unknown Injector         Y N N 1.5.99 4 3 2001 99 Unknown Injector         Y Y N 1.5.100 4 3 2005 100 Unknown Production         Y Y Y 1.5.101 4 3 2005 101 Unknown Production         Y Y Y 1.5.102 4 3 2005 102 Unknown Production         Y N Y 1.5.103 4 3 2006 103 Unknown Injector         Y Y Y 1.5.104 4 3 2006 104 Unknown Production         Y Y Y 1.5.105 4 3 2006 105 Unknown Production         Y N Y 1.5.106 4 3 2006 106 Unknown Production         Y Y Y 1.5.107 4 3 2009 107 Unknown Production         Y Y Y 1.5.108 4 3   108 Unknown Unknown 3.90       Y N Y 1.6.1 4 5   1 Production Production     3,404   Y N Y 1.6.2 4 5   2 Production Production     4,269   Y N Y 1.6.3 4 5   3 Non-commercial Abandoned     3,271   N N N 1.6.4 4 5   4 Production Production     3,911   Y N Y 1.6.5 4 5   5 Production Production         Y N Y 1.6.6 4 5   6 Non-commercial Abandoned     4,086   N N N 1.6.7 4 5   7 Production Production     3,606   Y N Y 1.6.8 4 5   8 Non-commercial Abandoned     3,929   N N N 1.6.9 4 5   9 Non-commercial Abandoned     4,097   N Y N 1.6.10 4 5   10 Non-commercial Abandoned         N N N 1.6.11 4 5   11 Injector Injector         Y N N 1.6.12 4 5   12 Non-commercial Abandoned         N Y N 1.6.13 4 5   13 Non-commercial Abandoned         N Y N 1.7.1 5 3 12/10/1974 6 Production Idle 12.00 2005 1,508 340 mm to 322 m Y N Y 1.7.2 5 3 8/9/1959 3 Non-commercial Abandoned     28   N N N 1.7.3 5 3 7/26/1959 2 Non-commercial Abandoned     600   N N N 1.7.4 5 3 9/17/1962 4 Non-commercial Abandoned     386   N N N 1.7.5 5 3 7/20/1959 1 Non-commercial Abandoned     655   N N N 1.7.6 5 3 9/9/1973 5 Non-commercial Unknown     2,085 244 mm to 304 m N Y N 1.7.7 5 3 4/6/2002 7 Unknown Observation     1,047   NA Y N 1.7.8 5 3 2/12/2008 8 Unknown Observation     525   NA Y N 1.8.1 3 5 1960 1 Dry-hole Unknown     1,120   N N N 1.8.2 3 5 1963 2 Dry-hole Unknown     780   N N N 1.8.3 3 5 1964 3 Dry-hole Unknown     1,725   N N N 1.8.4 3 5 1964 4 Dry-hole Unknown     671   N N N 1.8.5 3 5 1979 19 Non-commercial Unknown     2,195   N N N 1.8.6 3 5 1971 5 Dry-hole Unknown     877   N N N 1.8.7 3 5 1971 6 Dry-hole Unknown     1,466   N N N 1.8.8 3 5 1972 7 Dry-hole Unknown     1,686   N N N 1.8.9 3 5 1972 8 Dry-hole Unknown     1,686   N N N 1.8.10 3 5 1973 9 Production Unknown 3.00 11/13/1973 1,944   Y Y N 1.8.11 3 5 1973 10 Non-commercial Unknown     1,829   N N N 1.8.12 3 5 1973 11 Production Unknown 2.70 4/19/1976 2,113   Y N N 1.8.13 3 5 1973 12 Dry-hole Unknown     1,616   N Y N 1.8.14 3 5 1974 13 Dry-hole Unknown     3,242   N Y N 1.8.15 3 5 1974 14 Production Unknown 3.90 4/21/1981 2,508   Y N N 1.8.16 3 5 1975 15 Dry-hole Unknown     2,080   N N N 1.8.17 3 5 1975 16 Production Unknown 2.40 8/19/1975 1,466   Y Y N 1.8.18 3 5 1975 17 Production Unknown 5.70 1/6/1977 1,678   Y N N 1.8.19 3 5 1975 18 Dry-hole Unknown     2,134   N N N 1.8.20 3 5 3/1/1979 20 Dry-hole Unknown     1,906   N Y N 1.8.21 3 5 1979 21 Dry-hole Unknown     1,600   N Y N 1.8.22 3 5 1979 22 Dry-hole Unknown     1,710   N N N 1.8.23 3 5 1980 23 Non-commercial Unknown 1.90 1/6/1981 1,943   N Y N 1.8.24 3 5 1980 24 Dry-hole Unknown     914   N N N 1.8.25 3 5 1981 25 Non-commercial Unknown     1,751   N N N 1.8.26 3 5 1981 26 Production Unknown 2.30 9/15/1981 1,677   Y N N 1.8.27 3 5 1981 27 Dry-hole Unknown     2,696   N Y N 1.8.28 3 5 1982 28 Dry-hole Unknown     2,100   N N N 1.8.29 3 5 1984 29 Not tested Unknown     856   NA N N 1.8.30 3 5 1986 30 Non-commercial Unknown     528   NA N N 1.9.1 2 4 1905 1 Abandoned Abandoned     585   NA N N 1.9.2 2 4 1960 2 Non-commercial Abandoned     218   N N N 1.9.3 2 4 1960 3 Production Abandoned     198   Y Y Y 1.9.4 2 4 1961 4 Production Observation     221   Y Y Y 1.9.5 2 4 1961 5 Production Abandoned     242   Y Y Y 1.9.6 2 4 1963 6 Non-commercial Abandoned     72   N N N 1.9.7 2 4 1963 7 Non-commercial Abandoned     146   N N N 1.9.8 2 4 1964 8 Non-commercial Abandoned     283   N N N 1.9.9 2 4 1964 9 Non-commercial Abandoned     131   N Y N 1.9.10 2 4 1964 10 Non-commercial Abandoned     625   N N N 1.9.11 2 4 1965 11 Non-commercial Abandoned     306   N N N 1.9.12 2 4 2005 20 Non-commercial Idle         N N N 1.9.13 2 4 1974 12 Production Production 2.70   2,915   Y N Y 54 Success of Geothermal Wells: A Global Study Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 1.9.14 2 4 1975 13 Abandoned Injector     1,829   N N N 1.9.15 2 4 1976 14 Non-commercial Idle     2,199   N Y N 1.9.16 2 4 1979 15 Production Abandoned     396   Y N Y 1.9.17 2 4 1980 16 Production Injector     1,807   Y N Y 1.9.18 2 4 1981 17 Non-commercial Abandoned     2,745   N N N 1.9.19 2 4 1985 18 Production Production 6.00   2,134   Y N Y 1.9.20 2 4 1991 19 Production Production 5.80   2,501   Y N Y 1.10.1 2 4 2007 5 Production Production 7.50 9/28/2007 1,032   Y N Y 1.10.2 2 4 2008 6 Production Production 7.50 1/29/2008 713   Y N Y 1.10.3 2 4 2006 3 Production Production 7.20 1/17/2008 853   Y Y Y 1.10.4 2 4 2007 4 Non-commercial Observation         N N N 1.10.5 2 4 2008 7 Production Observation         Y N N 1.10.6 2 4 2008 8 Injector Injector 8.40 1/1/2008     Y N N 1.10.7 2 4 2008 11 Injector Injector         Y Y N 1.10.8 2 4 2002 1 Observation Observation     858   NA N N 1.10.9 2 4 2004 2 Observation Observation     1,524   NA N N 1.10.10 2 4 2009 13 Production Unknown         Y N Y 1.10.11 2 4 2009 16 Production Unknown         Y N Y 1.10.12 2 4 2009 14 Production Unknown         Y N Y 1.10.13 2 4 2009 20 Injector Unknown         Y N N 1.10.14 2 4 2009 18 Injector Unknown         Y Y N 1.10.15 2 4 2009 19 Injector Unknown         Y N N 1.10.16 2 4 2009 15 Injector Unknown         Y Y N 1.10.17 2 4 2010 21 Production Non-commercial         Y N Y 1.10.18 2 4 2008 9 Non-commercial Unknown         N N N 1.10.19 2 4 2008 10 Non-commercial Unknown         N Y N 1.10.20 2 4 2009 17 Unknown Unknown         NA Y N 1.10.21 2 4   22 Unknown Unknown         NA N N 1.10.22 2 4 2008 12 Non-commercial Unknown         N N N 1.10.23 2 4   23 Injector Unknown         Y N N 1.10.24 2 4   24 Injector Unknown         Y N N 1.11.1 2 4 1959 1 Unknown Abandoned     536   N N N 1.11.2 2 4 1960 2 Unknown Unknown     73   NA N N 1.11.3 2 4 1960 3 Unknown Unknown     186   NA N N 1.11.4 2 4 1961 4 Unknown Unknown     220   NA N N 1.11.5 2 4 1961 5 Unknown Unknown     549   NA N N 1.11.6 2 4 1905 6 Unknown Unknown     235   NA N N 1.11.7 2 4 1905 7 Unknown Unknown     76   NA N N 1.11.8 2 4 1964 8 Unknown Observation     1,543 244 mm to 150 m N N N 1.11.9 2 4 1974 9 Unknown Abandoned     2,217 219 mm to 1,219 m NA Y N 1.11.10 2 4 1905 10 Unknown Idle     1,057 346 mm to 318 m NA N N 1.11.11 2 4 1975 11 Unknown Idle     1,355 340 mm to 360 m NA Y N 1.11.12 2 4 1905 12 Unknown Idle         NA N N 1.11.13 2 4 1985 13 Production Idle     190 219 mm to 1,219 m Y N N 1.11.14 2 4 1986 14 Unknown Production     329 324 mm to 84 m Y Y Y 1.11.15 2 4 1986 15 Production Observation     135 340 mm to 116 m Y N N 1.11.16 2 4 1990 16 Non-commercial Unknown     889   N Y N 1.11.17 2 4 1990 17 Production Unknown     917   Y N Y 1.11.18 2 4 1991 18 Production Unknown     733 340 mm to 308 m Y N N 1.11.19 2 4 1991 19 Production Unknown     570 340 mm to 371 m Y N N 1.11.20 2 4 1991 20 Production Unknown     368 340 mm to 307 m Y N Y 1.11.21 2 4 1991 21 Dry-hole Unknown     901   N N N 1.11.22 2 4 1991 22 Production Production     591 406 mm to 407 m Y Y Y 1.11.23 2 4 1991 23 Production Unknown     603 406 mm to 424 m Y N N 1.11.24 2 4 1991 24 Production Production     585 406 mm to 425 m Y N Y 1.11.25 2 4 1991 25 Production Production     610 406 mm to 407 m Y N Y 1.11.26 2 4 1991 26 Production Production     709 340 mm to 434 m Y N Y 1.11.27 2 4 1991 27 Dry-hole Abandoned     762   N N N 1.11.28 2 4 1991 28 Production Unknown     6,096   Y Y Y 1.11.29 2 4 1991 29 Dry-hole Abandoned     483   N N N 1.11.30 2 4 1992 30 Dry-hole Abandoned     906   N N N 1.11.31 2 4 1992 31 Production Unknown     227   Y N Y 1.11.32 2 4 1992 32 Production Unknown     200   Y N Y 1.11.34 2 4 1992 33 Dry-hole Unknown     497   N N N 1.11.35 2 4 1992 34 Injector Unknown     215 273 mm to 135 m Y Y N 1.11.36 2 4 1992 35 Injector Unknown     213 273 mm to 87 m Y N N 1.11.37 2 4 1992 36 Injector Unknown     207 273 mm to 118 m Y N N 1.11.38 2 4 1992 37 Injector Unknown     235 273 mm to 126 m Y N N 1.11.39 2 4 1992 38 Dry-hole Abandoned     333   N N N 1.11.40 2 4   39 Unknown Unknown         NA N N 1.11.41 2 4   40 Unknown Production         Y N N 1.11.42 2 4   41 Unknown Production         Y N Y 1.11.43 2 4   42 Unknown Production         Y Y Y 1.11.44 2 4   43 Unknown Unknown         N N N 1.12.1 2 4 1974 1 Dry-hole Abandoned     2,335 340 mm to 237 m N N N 1.12.2 2 4 1976 3 Production Production     1,265 244 mm to 317 m Y N N 1.12.3 2 4 1976 2 Production Injector     973 244 mm to 619 m Y Y N 55 Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 1.12.4 2 4 1979 4 Non-commercial Abandoned     2,939 340 mm to 908 m N N N 1.12.5 2 4 1982 5 Production Production     996 340 mm to 769 m Y N N 1.12.6 2 4 1982 6 Non-commercial Injector     2,051 340 mm to 764 m N Y N 1.12.7 2 4 1984 7 Production Production     1,249 340 mm to 767 m Y N N 1.12.8 2 4 2003 8 Production Production         Y N N 1.12.9 2 4 2003 9 Production Production         Y N N 1.12.10 2 4 2004 10 Non-commercial Abandoned         N N N 1.12.11 2 4 2004 11 Non-commercial Abandoned         N N N 1.13.1 2 5 1989 22 Injector Injector     1,894   Y N N 1.13.2 2 5 1997 31 Non-commercial Idle     296 244 mm to 2,258 m Y N N 1.13.3 2 5 1983 13 Production Idle 4.80   2,777   Y N N 1.13.4 2 5 1990 23 Production Production 8.20   2,898   Y N N 1.13.5 2 5 1986 18 Production Injector     2,274 340 mm to 1,056 m Y N N 1.13.6 2 5 1994 28 Non-commercial Idle     3,570   N N N 1.13.7 2 5 1997 30 Production Production 4.70   2,926   Y N N 1.13.8 2 5 2000 32 Injector Injector     1,168   Y N N 1.13.9 2 5 1990 24 Injector Injector     3,273   Y Y N 1.13.10 2 5 1979 4 Non-commercial Idle     2,750   N N N 1.13.11 2 5 1983 14 Production Idle 5.20   3,113 244 mm to 2,294 m Y Y N 1.13.12 2 5 1981 12 Non-commercial Injector     2,518   Y N N 1.13.13 2 5 1980 8 Production Injector     3,005 244 mm to 2,112 m Y N N 1.13.14 2 5 1980 9 Gradient Idle     917   N N N 1.13.15 2 5 1980 10 Non-commercial Observation     3,810   N N N 1.13.16 2 5 1993 25 Non-commercial Idle     3,593   N Y N 1.13.17 2 5 1989 21 Production Production 5.40   2,908   Y Y N 1.13.18 2 5 1981 11 Production Injector     2,885 244 mm to 2,555 m Y Y N 1.13.19 2 5 1978 2 Gradient Idle     564   N Y N 1.13.20 2 5 1979 6 Non-commercial Idle     2,981   N N N 1.13.21 2 5 1986 19 Production Production 5.40   2,713 244 mm to 2,292 m Y Y N 1.13.22 2 5 1995 29 Production Production 4.40   2,725   Y N N 1.13.23 2 5 2003 33 Production Replaced         Y N N 1.13.24 2 5 1986 17 Production Production 5.90   2,710 340 mm to 1,063 m Y N N 1.13.25 2 5 1984 15 Non-commercial Observation     3,176   N Y N 1.13.26 2 5 1993 26 Production Production 8.40   2,954 340 mm to 1,220 m Y Y N 1.13.27 2 5 1986 16 Non-commercial Observation     2,860   N N N 1.13.28 2 5 1988 20 Production Idle 8.30   2,999   Y Y N 1.13.29 2 5 1993 27 Production Idle 4.70   2,546 244 mm to 2,055 m Y N N 1.13.30 2 5 1978 1 Gradient Abandoned     198   Y N N 1.13.31 2 5 1978 3 Production Injector     2,211   Y N N 1.13.32 2 5 1979 5 Non-commercial Observation     2,313   N Y N 1.13.33 2 5 1979 7 Production Injector     2,782 244 mm to 2,292 m Y N N 1.14.1 3 6 1982 5 Production Abandoned 2.00 1982   244 mm to 1,283 m Y N N 1.14.2 3 6 1985 8 Production Injector 3.50 1985 1,983 244 mm to 1,238 m Y Y N 1.14.3 3 6 1981 3 Production Abandoned 4.00 1982   244 mm to 1,241 m Y N N 1.14.4 3 6 1976 1 Production Unknown     1,968   Y N N 1.14.5 3 6 1981 4 Non-commercial Non-commercial     2,530   N N N 1.14.6 3 6 1981 2 Non-commercial Non-commercial     2,557   N N N 1.14.7 3 6 1983 6 Non-commercial Non-commercial     1,911   N Y N 1.14.8 3 6 1984 7 Non-commercial Non-commercial     1,511   N N N 1.14.9 3 6 1991 10 Production Injector 2.70 1991 2,257 244 mm to 1,188 m Y Y N 1.14.10 3 6 1990 9 Unknown Unknown     2,000   NA N N 1.14.11 3 6 1991 11 Unknown Injector     2,664   NA N N 1.14.12 3 6 1991 12 Blow out Abandoned     511 340 mm to 311 m N N N 1.14.13 3 6 1991 13 Unknown Unknown     1,684   NA N N 1.14.14 3 6 1991 14 Unknown Unknown     2,073   NA N N 1.14.15 3 6 1992 15 Blow out Abandoned     1,063   N N N 1.14.16 3 6 1992 16 Injector Injector     2,071   Y N N 1.14.17 3 6 1993 17 Production Production 17.10 1993 1,391   Y N N 1.14.18 3 6 1993 18 Production Production 16.20 1993 1,549   Y N N 1.15.1 2 3 1980 1 Non-commercial Abandoned     1,663   N N N 1.15.2 2 3 1980 2 Unknown Unknown     1,646 340 mm to 708 m NA N N 1.15.3 2 3 1980 3 Non-commercial Abandoned     951   N N N 1.15.4 2 3 1981 4 Non-commercial Abandoned     765   N N N 1.15.5 2 3 1982 5 Non-commercial Abandoned     618   N N N 1.15.6 2 3 1983 6 Non-commercial Abandoned     611   N N N 1.15.7 2 3 1983 7 Non-commercial Abandoned     520   N N N 1.15.8 2 3 2003 8 Abandoned Abandoned     158   N Y N 1.15.9 2 3 2004 9 Non-commercial Abandoned     1,173 114 mm to 758 m N Y N 1.15.10 2 3 2007 10 Non-commercial Idle     921 114 mm to 476 m Y N Y 1.15.11 2 3 2007 11 Production Idle 6.80 2010 1,492 340 mm to 459 m Y N Y 1.15.12 2 3 2007 12 Production Idle 2.40 2007 1,722 340 mm to 483 m Y Y Y 1.15.13 2 3 2007 13 Production Idle 1.20 2007 1,642 340 mm to 494 m Y N Y 1.15.14 2 3 2007 14 Production Idle 1.60 2007 1,743   Y N Y 1.15.15 2 3 2007 15 Unknown Unknown     1,741 340 mm to 474 m Y N Y 1.15.16 2 3 2010 16 Production Idle 6.30 2010 1,495   Y N N 1.15.17 2 3 2010 17 Injector Idle     1,928   NA N N 1.15.18 2 3 2010 18 Production Idle 6.50 2010 1,490   Y N N 56 Success of Geothermal Wells: A Global Study Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 1.16.1 5 2 1975 1 Production Production 4.36   1,521 340 mm to 1,113 m Y N Y 1.16.2 5 2 1976 2 Production Production 3.88   1,994 340 mm to 1,288 m Y Y Y 1.16.3 5 2 1976 3 Production Production 3.53   2,037 244 mm to 1,291 m Y Y Y 1.16.4 5 2 1978 7 Non-commercial Observation     1,529 244 mm to 866 m N Y N 1.16.5 5 2 1978 6 Production Production 2.77   1,405 244 mm to 1,039 m Y N Y 1.16.6 5 2 1978 4 Injector Injector     1,175 340 mm to 518 m Y N N 1.16.7 5 2 1978 5 Injector Injector     1,972 340 mm to 623 m Y N N 1.16.8 5 2   8 Unknown Unknown     1,856 273 mm to 1,804 m NA N N 1.16.9 5 2   9 Unknown Unknown     1,736 273 mm to 1,094 m NA N N 1.17.1 3 4 1975 1 Non-commercial Observation     2,099 140 mm to 1,284 m N N N 1.17.2 3 4 1975 2 Production Observation     831 178 mm to 704 m Y N N 1.17.3 3 4 1975 3 Production Production     878 244 mm to 550 m Y N N 1.17.4 3 4 1975 4 Non-commercial Stand-by injector     2,232 244 mm to 553 m N N N 1.17.5 3 4 1975 5 Production Production     1,631 244 mm to 523 m Y N N 1.17.6 3 4 1975 6 Non-commercial Injector     1,837 244 mm to 610 m Y N N 1.17.7 3 4 1976 7 Production Injector     1,859 244 mm to 550 m Y N N 1.17.8 3 4 1976 8 Production Observation     2,286 244 mm to 767 m Y N N 1.17.9 3 4 1976 9 Production Observation     382 244 mm to 335 m Y N N 1.17.10 3 4 1977 10 Non-commercial Observation     1,861 244 mm to 553 m N N N 1.17.11 3 4 1978 11 Non-commercial Observation     2,286 244 mm to 512 m N N N 1.17.12 3 4 1982 12 Production Observation 5.20   1,042 244 mm to 512 m Y N N 1.17.13 3 4 1982 13 Production Abandoned 8.30   793 340 mm to 489 m Y N N 1.17.14 3 4 1986 14 Production Production 7.30   1,143 340 mm to 415 m Y N N 1.17.15 3 4 1991 15 Production Production         Y N N 1.18.1 2 3 1977 1 Injector Idle     559 244 mm to 542 m Y N Y 1.18.2 2 3 1979 3 Dry-hole Abandoned       244 mm to 1,617 m N N N 1.18.3 2 3 1978 2 Dry-hole Abandoned         N N N 1.18.4 2 3 1991 4 Production Idle 3.60 2006 1,059 340 mm to 311 m Y N N 1.18.5 2 3 1992 5 Production Idle 3.30 2006 1,666 340 mm to 611 m Y N Y 1.18.6 2 3 1993 11 Not tested Abandoned     1,278   NA N N 1.18.7 2 3 1993 6 Unknown Abandoned     143   NA N N 1.18.8 2 3 1993 7 Non-commercial Abandoned     1,560   N N N 1.18.9 2 3 1993 8 Production Idle 3.50 2006 1,017   Y N Y 1.18.10 2 3 1993 9 Production Idle     616   Y N N 1.18.11 2 3 1993 10 Non-commercial Abandoned     1,589   N N N 1.18.12 2 3 1993 12 Non-commercial Abandoned     1,276   N Y N 1.18.13 2 3 2002 13 Production Idle 3.20 2006 636   Y N Y 1.19.1 2 3 2005 2 Production Production     154   Y N Y 1.19.2 2 3 2005 1 Production Production     148   Y N Y 1.19.3 2 3 2005 4 Production Production     148   Y N Y 1.19.4 2 3 2011 8 Production Production     168   Y N N 1.19.5 2 3 2011 9 Production Production     213   Y N Y 1.19.6 2 3 2005 3 Injector Injector     357   Y N N 1.19.7 2 3 2005 5 Injector Abandoned     678   N N N 1.19.8 2 3 2011 10 Injector Injector     503   Y Y N 1.19.9 2 3 2011 7 Injector Injector     500   Y N N 1.19.10 2 3 2007 6 Injector Injector     549   Y N N 1.20.1 2 3 1990 9 Production Abandoned     610 244 mm to 274 m Y N N 1.20.2 2 3 1991 13 Injector Injector     1,450 244 mm to 492 m Y N N 1.20.3 2 3 1991 10 Injector Idle     708 244 mm to 273 m Y N N 1.20.4 2 3 1990 5 Injector Abandoned     1,219 244 mm to 519 m N N N 1.20.5 2 3 1974 1 Injector Injector     516 340 mm to 307 m Y N N 1.20.6 2 3 1991 12 Injector Injector     482 340 mm to 392 m Y N N 1.20.7 2 3 1979 2 Production Abandoned     1,546 244 mm to 409 m Y Y N 1.20.8 2 3 2002 19 Injector Injector     1,325 340 mm to 688 m Y Y N 1.20.9 2 3 2002 20 Production Abandoned     1,509 340 mm to 688 m Y Y N 1.20.10 2 3 1991 11 Injector Abandoned     886 244 mm to 271 m Y N N 1.20.11 2 3 1993 18 Production Production     1,232 340 mm to 491 m Y N Y 1.20.12 2 3 1991 14 Production Production     270 340 mm to 239 m Y N Y 1.20.13 2 3 1991 15 Production Production     335 340 mm to 323 m Y N Y 1.20.14 2 3 2009 22 Unknown Unknown     2,742 340 mm to 672 m NA N N 1.20.15 2 3 1990 8 Injector Abandoned     643   NA N N 1.20.16 2 3 2009 21 Production Idle     1,423 340 mm to 1,220 m Y N Y 1.20.17 2 3 1991 16 Injector Idle     725 244 mm to 366 m Y N N 1.20.18 2 3 1990 4 Injector Idle     1,422 340 mm to 1,474 m Y N N 1.20.19 2 3 1990 6 Injector Injector     2,240 340 mm to 580 m Y N N 1.20.20 2 3 1981 3 Production Idle     2,587 244 mm to 1,521 m Y N Y 1.20.21 2 3 1992 17 Production Production     1,077 244 mm to 1,077 m Y Y Y 1.20.22 2 3 1990 7 Production Production     1,141 340 mm to 558 m Y Y Y 1.21.1 1 4 1992 15 Unknown Production     302   Y N Y 1.21.2 1 4 1992 24 Unknown Production     675   Y N N 1.21.3 1 4 1992 16 Unknown Production     324   Y N Y 1.21.4 1 4 1992 25 Unknown Injector     556   Y Y N 1.21.5 1 4 1992 18 Unknown Production     180   Y N Y 1.21.6 1 4 1992 23 Unknown Production     227   Y N Y 1.21.7 1 4 1992 21 Unknown Production     397   Y N Y 1.21.8 1 4 1992 19 Unknown Production     258   Y N Y 57 Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 1.21.9 1 4 1992 22 Unknown Production     610   Y N Y 1.21.10 1 4 1998 30 Production Observation     222   Y N N 1.21.11 1 4 1992 17 Injector Injector     825   Y Y N 1.21.12 1 4   31 Injector Observation     158   Y Y N 1.21.13 1 4 1992 20 Unknown Injector     822   Y Y N 1.21.14 1 4 1992 26 Unknown Injector     329   Y N N 1.21.15 1 4 1986 5 Production Production 5.30   192   Y Y Y 1.21.16 1 4 1985 4 Injector Production 6.90   162   Y N Y 1.21.17 1 4 1986 7 Production Production 9.60   173   Y N Y 1.21.18 1 4   32 Production Observation     191   Y Y N 1.21.19 1 4   33 Production Observation     174   Y N N 1.21.20 1 4   34 Production Observation     294   Y N N 1.21.21 1 4 2001 36 Unknown Unknown         NA N N 1.21.22 1 4 1994 29 Unknown Observation         NA N N 1.21.23 1 4 2001 35 Unknown Unknown         NA N N 1.21.24 1 4 1993 28 Unknown Observation         NA N N 1.21.25 1 4 1991 11 Unknown Observation         NA N N 1.21.26 1 4 1991 12 Unknown Observation         NA N N 1.21.27 1 4 1991 13 Unknown Observation         NA N N 1.21.28 1 4   14 Unknown Idle     120   NA N N 1.21.29 1 4 1993 27 Production Idle     899 340 mm to 554 m Y Y N 1.21.30 1 4 1979 1 Production Production 2.30   937 340 mm to 403 m Y N Y 1.21.31 1 4 1985 3 Production Production 3.10   921 340 mm to 456 m Y N Y 1.21.32 1 4 1987 10 Non-commercial Unknown     897 340 mm to 624 m N N N 1.21.33 1 4 1987 8 Non-commercial Unknown     935 340 mm to 609 m N N N 1.21.34 1 4 1987 9 Production Production 1.50   817 340 mm to 696 m Y Y Y 1.21.35 1 4 1986 6 Non-commercial Unknown     924 340 mm to 445 m N N N 1.21.36 1 4 1981 2 Non-commercial Injector     1,058 340 mm to 849 m N Y N 1.21.37 1 4   37 Unknown Unknown         Y N N 1.21.38 1 4   38 Unknown Unknown         Y N N 1.22.1 2 3   2 Unknown Injector     643   NA N N 1.22.2 2 3 1976 4 Unknown Observation     1,686 244 mm to 320 m N N N 1.22.3 2 3 1989 14 Unknown Idle     411 340 mm to 320 m Y N Y 1.22.4 2 3 1997 23 Unknown Idle     1,112 340 mm to 550 m Y N N 1.22.5 2 3 1989 16 Unknown Production     397 340 mm to 248 m Y N Y 1.22.6 2 3 1989 17 Unknown Production     381 340 mm to 244 m Y N Y 1.22.7 2 3 1989 13 Unknown Abandoned     270   N N N 1.22.8 2 3 1988 12 Unknown Idle     890 244 mm to 310 m Y Y N 1.22.9 2 3 1988 9 Unknown Idle     387 244 mm to 243 m N N N 1.22.10 2 3 1991 22 Unknown Idle     1,378 340 mm to 456 m Y N N 1.22.11 2 3 1979 7 Unknown Observation     2,117 244 mm to 364 m N N N 1.22.12 2 3 1988 10 Unknown Production     457 340 mm to 334 m Y N Y 1.22.13 2 3   18 Unknown Gradient     152   NA N N 1.22.14 2 3 1989 19 Unknown Injector     872 340 mm to 245 m Y N N 1.22.15 2 3 1991 20 Unknown Idle     694 340 mm to 315 m N N N 1.22.16 2 3   21 Unknown Injector     521   N N N 1.22.17 2 3 1964 1 Unknown Abandoned     1,292 273 mm to 457 m N N N 1.22.18 2 3   24 Unknown Injector     704   NA N N 1.22.19 2 3   25 Unknown Observation     1,347   N N N 1.22.20 2 3   26 Unknown Injector     445   NA N N 1.22.21 2 3   27 Unknown Gradient     152   NA N N 1.22.22 2 3   28 Unknown Production     805   Y N Y 1.22.23 2 3 1976 3 Unknown Observation     1,052 244 mm to 310 m N N N 1.22.24 2 3   29 Unknown Production     792   Y N Y 1.22.25 2 3   30 Unknown Injector     427   NA N N 1.22.26 2 3 1992 31 Unknown Abandoned     700   Y N Y 1.22.27 2 3   32 Unknown Production     719   Y N Y 1.22.28 2 3   33 Unknown Injector     503   NA N N 1.22.29 2 3 1981 8 Unknown Observation     3,052 340 mm to 424 m N N N 1.22.30 2 3   34 Unknown Production     563   Y N Y 1.22.31 2 3   35 Unknown Observation     763   N N N 1.22.32 2 3 1977 5 Unknown Production     814 244 mm to 309 m Y Y N 1.22.33 2 3 1978 6 Unknown Abandoned     1,109 244 mm to 314 m N N N 1.22.34 2 3 1988 11 Unknown Abandoned     832 340 mm to 330 m N N N 1.22.35 2 3 1989 15 Unknown Abandoned     285   N N N 2.1.1 3 6 06/1979 1 Unknown Unknown     1,368   NA N N 2.1.2 3 6 08/1979 2 Unknown Unknown     1,637   NA N N 2.1.3 3 6 07/1981 3 Unknown Unknown 11.30 1985 2,547   Y N N 2.1.4 3 6 11/1981 4 Unknown Unknown 4.80 1985 2,583   Y N N 2.1.5 3 6 12/1981 5 Unknown Unknown     2,675   NA N N 2.1.6 3 6 03/1982 6 Unknown Unknown     1,871   NA N N 2.1.7 3 6 08/1982 7 Unknown Unknown 4.00 1985 2,480   Y N N 2.1.8 3 6 11/1982 8 Unknown Unknown 6.00 1985 2,768   Y N N 2.1.9 3 6 01/1983 9 Unknown Unknown 3.60 1985 2,217   Y N N 2.1.10 3 6 03/1983 10 Unknown Unknown 5.00 1985 2,715   Y N N 2.1.11 3 6 06/1983 11 Unknown Unknown 4.80 1985 2,834   Y N N 2.1.12 3 6 08/1983 12 Unknown Unknown     2,897   NA N N 58 Success of Geothermal Wells: A Global Study Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 2.1.13 3 6 10/1983 13 Unknown Unknown 2.40 1985 2,218   N N N 2.1.14 3 6 10/1983 14 Unknown Unknown 14.00 1985 3,333   Y N N 2.1.15 3 6 12/1983 15 Unknown Unknown 3.00 1985 2,004   Y Y N 2.1.16 3 6 05/1984 16 Unknown Unknown     1,777   NA Y N 2.1.17 3 6 08/1984 18 Unknown Unknown 1.80 1985 2,698   N N N 2.1.18 3 6 07/1984 17 Unknown Unknown 3.00 1985 2,930   Y N N 2.1.19 3 6 09/1984 19 Unknown Unknown     2,439   NA Y N 2.1.20 3 6 12/1984 20 Unknown Unknown     1,561   NA N N 2.2.1 3 6   1 Unknown Unknown 2.50 10/1/2004     N N N 2.2.2 3 6   2 Unknown Unknown 2.40 10/2004     N N N 2.2.3 3 6   3 Unknown Unknown 2.80 1/1984     N N N 2.2.4 3 6   4 Unknown Unknown 7.00 2/1/2003     Y N N 2.2.5 3 6   5 Unknown Unknown 7.30 9/22/2004     Y N N 2.2.6 3 6   6 Unknown Unknown 7.90 1978     Y N N 2.2.7 3 6   7 Unknown Unknown 8.50 5/15/2006     Y N N 2.2.8 3 6   8 Unknown Unknown 0.60 11/2007     N N N 2.2.9 3 6   9 Unknown Unknown 3.40 8/26/2008     Y N N 2.2.10 3 6   10 Unknown Unknown 3.80 3/8/2010     Y N N 2.2.11 3 6   11 Unknown Unknown 2.20 10/2/2010     N N N 2.2.12 3 6   12 Unknown Unknown 10.40 1/1995     Y N N 2.2.13 3 6   13 Unknown Unknown 13.30 1/1981     Y N N 2.2.14 3 6   14 Unknown Unknown 14.30 8/1995     Y N N 2.2.15 3 6   15 Unknown Unknown 14.60 1990     Y N N 2.2.16 3 6   16 Unknown Unknown 7.40 11/1995     Y N N 2.2.17 3 6   17 Unknown Unknown 14.70 1/1995     Y Y N 2.2.18 3 6   18 Unknown Unknown 15.00 5/1995     Y N N 2.2.19 3 6   19 Unknown Unknown 15.30 6/1998     Y N N 2.2.20 3 6   20 Unknown Unknown 3.70 9/2008     Y N N 2.2.21 3 6   21 Unknown Unknown 15.90 5/13/2003     Y N N 2.2.22 3 6   22 Unknown Unknown 16.90 1979     Y N N 2.2.23 3 6   23 Unknown Unknown 18.00 1/1995     Y N N 2.2.24 3 6   24 Unknown Unknown 19.30 8/1999     Y N N 2.2.25 3 6   25 Unknown Unknown 13.70 1990     Y N N 2.2.26 3 6   26 Unknown Unknown 9.90 6/1982     Y N N 2.2.27 3 6   27 Unknown Unknown 19.60 11/1995     Y N N 2.2.28 3 6 2009 31 Unknown Unknown 9.30 2008     Y N N 2.2.29 3 6 2008 28 Unknown Unknown 7.90 2008     Y N N 2.2.30 3 6 2009 32 Unknown Unknown 3.20 2008     Y N N 2.2.31 3 6 2010 36 Unknown Unknown 2.90 2008     N N N 2.2.32 3 6 2010 38 Unknown Unknown 7.00 2007     Y N N 2.2.33 3 6 2009 29 Unknown Unknown 11.20 2007     Y N N 2.2.34 3 6 2010 33 Unknown Unknown 3.50 2010     Y N N 2.2.35 3 6 2010 35 Unknown Unknown 3.30 2010     Y N N 2.2.36 3 6 2009 30 Unknown Unknown 1.10 2010     N N N 2.2.37 3 6 2010 34 Unknown Unknown 3.40 2010     Y N N 2.2.38 3 6 2010 42 Unknown Unknown 3.97 2010     Y N N 2.2.39 3 6 2010 39 Unknown Unknown 2.83 2010     N N N 2.2.40 3 6 2010 37 Unknown Unknown         Y N N 2.2.41 3 6 2010 43 Unknown Unknown         Y N N 2.2.42 3 6 2010 40 Unknown Unknown         Y N N 2.2.43 3 6 2010 41 Unknown Unknown         Y N N 2.3.1 3 6 1975 1 Production Production     1,765   Y N N 2.3.2 3 6 1975 2 Injector Abandoned     2,423   Y N N 2.3.3 3 6 1975 3 Production Production     987   Y Y N 2.3.4 3 6 1976 4 Production Production     2,502   Y N N 2.3.5 3 6 1976 5 Non-commercial Abandoned     2,458   N N N 2.3.6 3 6 1976 6 Production Production     906   Y N N 2.3.7 3 6 1976 7 Production Production     1,910   Y N N 2.3.8 3 6 1976 8 Production Production     1,402   Y N N 2.3.9 3 6 1976 9 Production Production     1,224   Y N N 2.3.10 3 6 1976 10 Production Production     1,679   Y N N 2.3.11 3 6 1976 11 Production Production     1,062   Y N N 2.3.12 3 6 1977 12 Production Production     2,134   Y N N 2.3.13 3 6 1977 13 Production Production     1,058   Y N N 2.3.14 3 6 1977 15 Production Production     1,122   Y N N 2.3.15 3 6 1977 14 Production Production     2,669   Y N N 2.3.16 3 6 1977 16 Production Production     1,563   Y N N 2.3.17 3 6 1977 17 Production Production     2,260   Y N N 2.3.18 3 6 1977 18 Production Production     2,600   Y N N 2.3.19 3 6 1977 19 Injector Injector     2,881   Y Y N 2.3.20 3 6 1978 20 Production Production     954   Y N N 2.3.21 3 6 1978 21 Production Production     2,091   Y N N 2.3.22 3 6 1978 22 Injector Abandoned     2,688   N N N 2.3.23 3 6 1978 23 Production Production     992   Y N N 2.3.24 3 6 1978 24 Production Production     1,724   Y N N 2.3.25 3 6 1978 25 Injector Injector     1,672   Y N N 2.3.26 3 6 1978 26 Production Production     876   Y N N 59 Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 2.3.27 3 6 1978 27 Production Production     1,630   Y N N 2.3.28 3 6 1978 28 Production Production     1,879   Y N N 2.3.29 3 6 1978 29 Production Production     1,920   Y N N 2.3.30 3 6 1979 30 Injector Injector     2,861   Y N N 2.3.31 3 6 1979 31 Injector Injector     2,861   Y Y N 2.3.32 3 6 1979 32 Injector Suspended     2,486   Y N N 2.3.33 3 6 1979 34 Injector Injector     2,670   Y N N 2.3.34 3 6 1979 33 Production Production     2,449   Y N N 2.3.35 3 6 1979 35 Production Production     1,965   Y N N 2.3.36 3 6 1979 39 Production Production     1,559   Y N N 2.3.37 3 6 1979 36 Injector Observation     2,377   Y N N 2.3.38 3 6 1979 37 Production Production     1,890   Y N N 2.3.39 3 6 1979 40 Production Production     1,597   Y N N 2.3.40 3 6 1979 38 Production Abandoned     2,088   Y N N 2.3.41 3 6 1979 44 Production Abandoned     2,065   Y N N 2.3.42 3 6 1979 41 Production Abandoned     1,266   Y N N 2.3.43 3 6 1979 42 Injector Idle     2,223   Y N N 2.3.44 3 6 1979 43 Production Production     1,212   Y N N 2.3.45 3 6 1979 45 Production Production     2,415   Y N N 2.3.46 3 6 1979 46 Production Production     2,256   Y N N 2.3.47 3 6 1980 49 Production Production     1,605   Y N N 2.3.48 3 6 1979 47 Injector Idle     2,353   Y N N 2.3.49 3 6 1979 48 Production Production     1,384   Y N N 2.3.50 3 6 1980 51 Injector Injector     2,817   Y N N 2.3.51 3 6 1980 50 Production Production     1,756   Y N N 2.3.52 3 6 1980 54 Production Production     1,606   Y N N 2.3.53 3 6 1980 53 Production Production     2,819   Y N N 2.3.54 3 6 1980 52 Injector Idle     1,375   Y N N 2.3.55 3 6 1980 55 Production Production     2,848   Y N N 2.3.56 3 6 1982 67 Production Abandoned     2,904   Y N N 2.3.57 3 6 1980 62 Injector Idle     2,915   Y N N 2.3.58 3 6 1980 56 Injector Idle     2,894   Y N N 2.3.59 3 6 1980 61 Production Production     2,947   Y N N 2.3.60 3 6 1980 57 Production Production     1,023   Y N N 2.3.61 3 6 1980 59 Production Observation     2,510   Y N N 2.3.62 3 6 1982 68 Production Production     1,504   Y N N 2.3.63 3 6 1980 63 Production Abandoned     3,048   Y N N 2.3.64 3 6 1980 58 Production Production     655   Y N N 2.3.65 3 6 1982 70 Production Production     3,140   Y N N 2.3.66 3 6 1983 71 Production Production     2,247   Y N N 2.3.67 3 6 1982 69 Production Production     2,695   Y N N 2.3.68 3 6 1983 72 Injector Abandoned     3,624   Y N N 2.3.69 3 6 1988 73 Injector Injector     2,713   Y N N 2.3.70 3 6 1989 74 Production Production     1,497   Y N N 2.3.71 3 6 1980 60 Production Production     1,762   Y N N 2.3.72 3 6 1989 75 Production Production     1,433   Y N N 2.3.73 3 6 1989 76 Injector Injector     3,028   Y N N 2.3.74 3 6 1989 77 Production Production     1,829   Y N N 2.3.75 3 6 1981 66 Injector Injector     2,764   Y N N 2.3.76 3 6 1981 65 Production Production     2,370   Y N N 2.3.77 3 6 1989 78 Injector Injector     2,967   Y N N 2.3.78 3 6 1990 79 Injector Injector     2,991   Y N N 2.3.79 3 6 1981 64 Production Production     1,280   Y N N 2.3.80 3 6 1990 80 Production Production     1,981   Y N N 2.3.81 3 6 1990 81 Injector Injector     3,048   Y N N 2.3.82 3 6 1990 82 Injector Injector     2,877   Y N N 2.3.83 3 6 1990 83 Production Production     2,286   Y N N 2.3.84 3 6 1990 84 Production Production     2,289   Y N N 2.3.85 3 6 1991 85 Injector Injector     3,009   Y N N 2.3.86 3 6 1991 86 Production Production     2,286   Y N N 2.3.87 3 6 1991 87 Injector Injector     2,987   Y N N 2.3.88 3 6 1992 89 Production Production     2,283   Y N N 2.3.89 3 6 1992 88 Production Production     2,283   Y N N 2.3.90 3 6 1992 90 Production Production     2,213   Y N N 2.3.91 3 6 1992 91 Observation Observation     2,207   N N N 2.3.92 3 6 1993 92 Production Production     2,287   Y N N 2.3.93 3 6 1993 93 Production Production     2,277   Y N N 2.3.94 3 6 1993 94 Injector Injector         Y N N 2.3.95 3 6 1993 95 Production Production     1,923   Y N N 2.3.96 3 6 1993 97 Production Production     2,147   Y N N 2.3.97 3 6 1993 96 Injector Injector     2,857   Y N N 2.4.1 3 6 1987 1 Unknown Production         Y N N 2.4.2 3 6 1988 2 Unknown Production         Y N N 2.4.3 3 6 1992 3 Unknown Injector         Y Y N 2.4.4 3 6 1992 4 Unknown Injector         Y Y N 2.4.5 3 6 1993 5 Unknown Injector         Y Y N 2.4.6 3 6 1993 6 Unknown Production 10.40 5/3/1999     Y N N 60 Success of Geothermal Wells: A Global Study Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 2.4.7 3 6 1993 7 Unknown Production 7.40 1/28/1997     Y N N 2.4.8 3 6 1993 8 Unknown Production 10.40 1/28/1997     Y N N 2.4.9 3 6 1993 9 Unknown Injector         Y Y N 2.4.10 3 6 1993 10 Unknown Production 8.90 1/28/1997     Y N N 2.4.11 3 6 1993 11 Unknown Injector         Y Y N 2.4.12 3 6 1993 12 Unknown Abandoned         N N N 2.4.13 3 6 1993 13 Unknown Injector         Y Y N 2.4.14 3 6 1993 14 Unknown Production 6.30 1/28/1997     Y N N 2.4.15 3 6 1993 15 Unknown Production 10.90 5/1/1999     Y N N 2.4.16 3 6 1994 16 Unknown Production 9.40 1/28/1997     Y N N 2.4.17 3 6 1994 17 Unknown Production 4.60 1/28/1997     Y Y N 2.4.18 3 6 1994 18 Unknown Production 6.10 1/28/1997     Y N N 2.4.19 3 6 1994 19 Unknown Abandoned         N N N 2.4.20 3 6 1994 20 Unknown Production 7.00 2/9/1999     Y N N 2.4.21 3 6 1994 21 Unknown Production 9.90 1/28/1997     Y N N 2.4.22 3 6 1994 22 Unknown Unknown         NA N N 2.4.23 3 6 1994 23 Unknown Production 7.30 5/1/1999     Y N N 2.4.24 3 6 1995 24 Unknown Production 6.40 5/3/1999     Y N N 2.4.25 3 6 1995 25 Unknown Production 9.30 2/9/1999     Y N N 2.4.26 3 6 1996 26 Unknown Idle         NA N N 2.4.27 3 6 1997 27 Unknown Production 8.20 2/9/1999     Y N N 2.4.28 3 6 1999 28 Unknown Production 3.50 11/21/2000     Y N N 2.4.29 3 6 2000 29 Unknown Injector         Y Y N 2.4.30 3 6 2000 30 Unknown Production 8.40 11/21/2000     Y N N 2.4.31 3 6 2002 31 Unknown Injector         Y Y N 2.4.32 3 6 2008 32 Unknown Injector         Y Y N 2.4.33 3 6 2010 33 Unknown Injector         Y Y N 2.5.1 3 6 1976 1 Unknown Unknown     607 NA to 242 m N N N 2.5.2 3 6   2 Unknown Unknown     610 NA to 362 m N N N 2.5.3 3 6   3 Unknown Unknown     971 NA to 762 m N N N 2.5.4 3 6   4 Unknown Unknown     1,980 NA to 604 m N N N 2.5.5 3 6 1978 5 Unknown Unknown 7.40 2/26/1999 1,165 NA to 455 m Y N N 2.5.6 3 6   6 Unknown Unknown     1,522 NA to 666 m N N N 2.5.7 3 6   7 Unknown Unknown     2,130 NA to 910 m N N N 2.5.8 3 6   8 Unknown Unknown     1,975 NA to 1,310 m N N N 2.5.9 3 6   9 Unknown Unknown     2,771 NA to 1,329 m N N N 2.5.10 3 6 1980 10 Unknown Unknown 10.80 8/26/1980 2,883 NA to 1,664 m Y N N 2.5.11 3 6   11 Unknown Unknown     2,982 NA to 1,374 m N N N 2.5.12 3 6 1980 12 Unknown Unknown 4.50 1/28/1981 2,890 NA to 1,224 m Y N N 2.5.13 3 6 1981 14 Unknown Unknown 2.60 2/18/1981 3,019 NA to 1,407 m Y N N 2.5.14 3 6   15 Unknown Unknown     2,818 NA to 1,285 m N N N 2.5.15 3 6   16 Unknown Unknown     2,797 NA to 1,456 m N N N 2.5.16 3 6 1992 38 Unknown Unknown 6.00 7/29/1992 2,593 NA to 1,381 m Y N N 2.5.17 3 6 1995 40 Unknown Unknown 3.20 8/11/1995 1,900 NA to 1,289 m Y N N 2.5.18 3 6 1995 41 Unknown Unknown 2.00 1/15/1996 2,242 NA to 1,126 m Y N N 2.5.19 3 6 2010 42 Unknown Unknown 8.60 6/21/2010 2,900 NA to 1,540 m Y N N 2.5.20 3 6 1981 17 Unknown Unknown 1.40 9/25/1981 2,854 NA to 1,172 m N N N 2.5.21 3 6 1981 18 Unknown Unknown 5.80 10/2/1981 2,807 NA to 1,594 m Y N N 2.5.22 3 6 1981 19 Unknown Unknown 3.70 1/11/1982 3,049 NA to 1,478 m Y N N 2.5.23 3 6 1980 13 Unknown Unknown 4.20 2/24/1983 3,265 NA to 1,389 m Y N N 2.5.24 3 6   21 Unknown Unknown 5.20 9/22/1982 3,013 NA to 1,279 m Y N N 2.5.25 3 6 1982 26 Unknown Unknown 5.50 11/30/1982 3,013 NA to 1,279 m Y N N 2.5.26 3 6 1982 23 Unknown Unknown 2.20 10/12/1980 2,982 NA to 1,230 m Y N N 2.5.27 3 6 1982 25 Unknown Unknown 5.00 11/1/1982 2,988 NA to 1,466 m Y N N 2.5.28 3 6 1981 20 Unknown Unknown 5.30 1/21/1983 3,090 NA to 1,312 m Y N N 2.5.29 3 6 1982 24 Unknown Unknown 3.00 11/30/1982 3,222 NA to 1,414 m Y N N 2.5.30 3 6 1983 28 Unknown Unknown 3.70 10/19/1984 3,466 NA to 1,536 m Y N N 2.5.31 3 6 1982 27 Unknown Unknown 4.70 11/17/1982 2,773 NA to 1,574 m Y N N 2.5.32 3 6 1983 29 Unknown Unknown 7.60 9/8/1983 3,161 NA to 1,240 m Y N N 2.5.33 3 6 1983 30 Unknown Unknown 6.70 8/23/1983 2,893 NA to 1,095 m Y N N 2.5.34 3 6 1983 31 Unknown Unknown 6.20 8/12/1983 2,910 NA to 1,393 m Y N N 2.5.35 3 6 1983 32 Unknown Unknown 5.00 10/11/1983 3,055 NA to 1,354 m Y N N 2.5.36 3 6 1983 35 Unknown Unknown 7.60 12/4/1983 2,779 NA to 1,000 m Y N N 2.5.37 3 6 1990 37 Unknown Unknown 2.60 1/1/1991 2,250 NA to 1,118 m Y N N 2.5.38 3 6 1993 39 Unknown Unknown 1.40 3/11/1994 1,279 NA to 692 m N N N 2.5.39 3 6   43 Unknown Unknown     2,763   N N N 2.5.40 3 6   44 Unknown Unknown     2,945 NA to 1,217 m N N N 2.5.41 3 6   45 Unknown Unknown     2,952 NA to 878 m N N N 2.5.42 3 6 1983 33 Unknown Unknown 9.50 7/2/1983 2,589 NA to 692 m Y N N 2.5.43 3 6 1983 34 Unknown Unknown 1.60 2/6/2008 2,628 NA to 1,171 m N Y N 2.5.44 3 6 1983 36 Unknown Unknown 3.50 2/10/2008 3,039 NA to 1,374 m Y Y N 2.5.45 3 6 1982 22 Unknown Unknown 3.60 9/13/1982 3,077   Y N N 2.5.46 3 6   46 Unknown Unknown         N N N 2.5.47 3 6   47 Unknown Unknown         Y N N 2.5.48 3 6   48 Unknown Unknown         Y N N 2.5.49 3 6   49 Unknown Unknown         N N N 2.5.50 3 6   50 Unknown Unknown         Y N N 61 Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 2.5.51 3 6   51 Unknown Unknown         Y N N 2.5.52 3 6   52 Unknown Unknown         Y N N 2.5.53 3 6   53 Unknown Unknown         N N N 2.5.54 3 6   54 Unknown Unknown         Y N N 2.5.55 3 6   55 Unknown Unknown         Y N N 2.5.56 3 6   56 Unknown Unknown         Y N N 2.6.1 3 6 1972 1 Production Unknown 3.70 1983 1,769   Y N N 2.6.2 3 6 1973 2 Production Unknown 4.10 1983 1,783   Y N N 2.6.3 3 6 1973 3 Production Unknown 3.70 1983 2,377   Y N N 2.6.4 3 6 1974 4 Production Unknown 6.40 1983 1,585   Y N N 2.6.5 3 6 1974 5 Non-commercial Unknown     2,245   N N N 2.6.6 3 6 1974 6 Production Unknown 10.50 1983 1,257   Y N N 2.6.7 3 6 1974 7 Injector Unknown 1.70 1983 1,500   N N N 2.6.8 3 6 1975 8 Non-commercial Unknown 4.00 1983 2,743   Y N N 2.6.9 3 6 1975 9 Production Unknown 4.30 1983 1,931   Y N N 2.6.10 3 6 1975 10 Production Unknown 5.40 1983 579   Y Y N 2.6.11 3 6 1975 11 Production Unknown 6.90 1983 1,585   Y N N 2.6.12 3 6 1976 12 Production Unknown 5.40 1983 1,799   Y N N 2.6.13 3 6 1976 13 Production Unknown 3.70 1983 2,033   Y N N 2.6.14 3 6 1976 14 Production Unknown 6.20 1983 2,277   Y N N 2.6.15 3 6 1976 15 Production Unknown 2.20 1983 2,889   Y N N 2.6.16 3 6 1976 16 Production Unknown 17.70 1983 721   Y N N 2.6.17 3 6 1976 17 Non-commercial Unknown 1.80 1983 1,700   N N N 2.6.18 3 6 1976 18 Production Unknown 11.80 1983 1,524   Y N N 2.6.19 3 6 1977 19 Production Unknown 10.30 1983 1,380   Y N N 2.6.20 3 6 1977 20 Production Unknown 2.50 1983 2,169   Y N N 2.6.21 3 6 1977 21 Production Unknown 3.90 1983 887   Y Y N 2.6.22 3 6 1977 22 Production Unknown 5.40 1983 2,275   Y N N 2.6.23 3 6 1977 23 Production Unknown 5.70 1983 2,269   Y N N 2.6.24 3 6 1977 24 Production Unknown 7.70 1983 1,675   Y N N 2.6.25 3 6 1977 25 Injector Unknown 4.60 1983 2,134   Y N N 2.6.26 3 6 1977 26 Production Unknown 3.50 1983 2,129   Y N N 2.6.27 3 6 1978 27 Production Unknown     2,118   Y N N 2.6.28 3 6 1978 28 Production Unknown 9.30 1983 2,165   Y N N 2.6.29 3 6 1978 29 Injector Unknown     2,316   N N N 2.6.30 3 6 1978 30 Production Unknown 11.10 1983 1,515   Y N N 2.6.31 3 6 1978 31 Production Unknown 13.70 1983 1,293   Y Y N 2.6.32 3 6 1978 32 Production Unknown 7.30 1983 2,200   Y N N 2.6.33 3 6 1979 33 Injector Unknown 7.60 1983 2,096   Y N N 2.6.34 3 6 1979 34 Production Unknown 6.60 1983 1,476   Y N N 2.6.35 3 6 1979 35 Non-commercial Unknown 0.30 1983 1,559   N Y N 2.6.36 3 6 1979 36 Production Unknown 4.40 1983 1,449   Y N N 2.6.37 3 6 1979 37 Production Unknown 10.80 1983 2,112   Y N N 2.6.38 3 6 1979 38 Production Unknown 5.10 1983 1,609   Y N N 2.6.39 3 6 1979 39 Production Unknown 18.50 1983 493   Y N N 2.6.40 3 6 1979 40 Production Unknown 3.90 1983 1,234   Y N N 2.6.41 3 6 1979 41 Production Unknown 6.60 1983 1,128   Y N N 2.6.42 3 6 1979 42 Production Unknown 8.50 1983 1,219   Y N N 2.6.43 3 6 1979 43 Production Unknown 13.10 1983 480   Y N N 2.6.44 3 6 1979 44 Non-commercial Unknown 2.40 1983 1,264   N N N 2.6.45 3 6 1979 45 Production Unknown   1983 380   Y Y N 2.6.46 3 6 1979 46 Production Unknown 5.30 1983 1,788   Y Y N 2.6.47 3 6 1979 47 Production Unknown 6.60 1983 2,063   Y Y N 2.6.48 3 6 1979 48 Production Unknown 19.40 1983 772   Y Y N 2.6.49 3 6 1979 49 Production Unknown 2.10 1983 759   Y Y N 2.6.50 3 6 1979 50 Production Unknown 9.50 1983 1,335   Y N N 2.6.51 3 6 1980 51 Production Unknown 14.30 1983 1,260   Y N N 2.6.52 3 6 1980 52 Non-commercial Unknown 2.70 1983 1,928   N N N 2.6.53 3 6 1980 53 Production Unknown 6.50   1,322   Y N N 2.6.54 3 6 1980 54 Production Unknown 5.20 1983 1,316   Y N N 2.6.55 3 6 1980 55 Production Unknown 11.00 1983 894   Y N N 2.6.56 3 6 1980 56 Production Unknown 4.30 1983 1,203   Y N N 2.6.57 3 6 1980 57 Production Unknown 23.30 1983 636   Y N N 2.6.58 3 6 1980 58 Production Unknown 11.00 1983 938   Y N N 2.6.59 3 6 1980 59 Production Unknown 11.30 1983 1,508   Y N N 2.6.60 3 6 1980 60 Production Unknown 7.70 1983 1,308   Y N N 2.6.61 3 6 1980 61 Production Unknown     2,244   Y N N 2.6.62 3 6 1980 62 Production Unknown 10.50 1983 1,130   Y N N 2.6.63 3 6 1980 63 Production Unknown 5.40 1983 2,134   Y Y N 2.6.64 3 6 1980 64 Production Unknown 5.90 1983 1,455   Y N N 2.6.65 3 6 1980 65 Production Unknown 6.40 1983 1,715   Y N N 2.6.66 3 6 1980 66 Production Unknown 9.60 1983 1,066   Y N N 2.6.67 3 6 1980 67 Production Unknown 9.80 1983 1,344   Y N N 2.6.68 3 6 1981 68 Production Unknown 7.30 1983 1,365   Y N N 2.6.69 3 6 1981 69 Production Unknown 11.90 1983 1,242   Y Y N 2.6.70 3 6 1981 70 Production Unknown 5.40 1983 1,420   Y N N 2.6.71 3 6 1981 71 Production Unknown 11.90 1983 1,170   Y N N 62 Success of Geothermal Wells: A Global Study Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 2.6.72 3 6 1981 72 Production Unknown 4.30 1983 1,691   Y N N 2.6.73 3 6 1981 73 Production Unknown 7.50 1983 732   Y N N 2.6.74 3 6 1981 74 Production Unknown 14.50 1983 1,204   Y N N 2.6.75 3 6 1981 75 Production Unknown 33.90 1983 648   Y N N 2.6.76 3 6 1981 76 Non-commercial Unknown 1.50 1983 198   N N N 2.6.77 3 6 1981 77 Production Unknown 4.90 1983 1,216   Y N N 2.6.78 3 6 1981 78 Production Unknown 4.90 1983 1,656   Y N N 2.6.79 3 6 1981 79 Non-commercial Unknown 0.70 1983 1,751   N N N 2.6.80 3 6 1981 80 Production Unknown 4.80 1983 2,688   Y N N 2.6.81 3 6 1981 81 Production Unknown 11.40 1983 2,413   Y N N 2.6.82 3 6 1981 82 Non-commercial Unknown 2.20 1983 1,658   N N N 2.6.83 3 6 1981 83 Non-commercial Unknown 3.00 1983 897   Y Y N 2.6.84 3 6 1981 84 Non-commercial Unknown 2.90 1983 2,253   N N N 2.6.85 3 6 1981 85 Production Unknown 5.00 1983 571   Y N N 2.6.86 3 6 1982 86 Non-commercial Unknown     2,449   N N N 2.6.87 3 6 1982 87 Production Unknown 18.20 1983 2,490   Y N N 2.6.88 3 6 1982 88 Production Unknown 3.40 1983 255   Y N N 2.6.89 3 6 1982 89 Production Unknown     1,173   Y N N 2.6.90 3 6 1982 90 Production Unknown     1,219   Y N N 2.6.91 3 6 1982 91 Production Unknown     936   Y N N 2.6.92 3 6 1982 92 Non-commercial Unknown     1,201   N N N 2.6.93 3 6 1983 93 Production Unknown     1,184   Y N N 2.6.94 3 6 1983 94 Production Unknown     1,233   Y N N 2.6.95 3 6 1983 95 Production Unknown     1,414   Y N N 2.6.96 3 6 1983 96 Production Unknown     2,783   Y N N 2.6.97 3 6 1984 97 Production Unknown     1,148   Y N N 2.6.98 3 6 1984 98 Non-commercial Unknown     1,731   N N N 2.6.99 3 6 1984 99 Non-commercial Unknown     2,265   N Y N 2.6.100 3 6 1984 100 Production Unknown     1,311   Y N N 2.6.101 3 6 1984 101 Production Unknown     1,219   Y N N 2.6.102 3 6 1985 102 Production Unknown     1,317   Y N N 2.6.103 3 6 1985 103 Marginal Unknown     1,163   N N N 2.6.104 3 6 1985 104 Non-commercial Unknown     2,108   N N N 2.6.105 3 6 1985 105 Production Unknown     1,381   Y N N 2.6.106 3 6 1985 106 Production Unknown     1,011   Y N N 2.6.107 3 6 1985 107 Production Unknown     1,376   Y Y N 2.6.108 3 6 1985 108 Production Unknown     1,318   Y N N 2.6.109 3 6 1986 109 Production Unknown     1,481   Y N N 2.6.110 3 6 1986 110 Production Unknown     1,207   Y N N 2.6.111 3 6 1986 111 Production Unknown     1,104   Y N N 2.6.112 3 6 1986 112 Production Unknown     3,094   Y N N 2.6.113 3 6 1986 113 Production Unknown     1,829   Y N N 2.6.114 3 6 1987 114 Injector Unknown     2,421   Y N N 2.6.115 3 6 1987 115 Injector Unknown     2,114   Y Y N 2.6.116 3 6 1987 116 Injector Unknown     2,351   Y N N 2.6.117 3 6 1988 117 Production Unknown     1,410   Y N N 2.6.118 3 6 1988 118 Unknown Unknown     1,384   Y N N 2.6.119 3 6 1988 119 Production Unknown     1,459   Y N N 2.6.120 3 6 1988 120 Injector Unknown     2,716   Y N N 2.6.121 3 6 1988 121 Production Unknown     1,433   Y N N 2.6.122 3 6 1988 122 Production Unknown     1,389   Y N N 2.6.123 3 6 1989 123 Injector Unknown     3,048   Y N N 2.6.124 3 6 1990 124 Non-commercial Unknown     1,143   N N N 2.6.125 3 6 1990 125 Production Unknown     1,980   Y N N 2.6.126 3 6 1990 126 Production Unknown     1,053   Y N N 2.6.127 3 6 1990 127 Production Unknown     1,375   Y N N 2.6.128 3 6 1991 128 Production Unknown     1,566   Y N N 2.6.129 3 6 1991 129 Production Unknown     1,955   Y N N 2.6.130 3 6 1991 130 Production Unknown     2,137   Y N N 2.6.131 3 6 1992 131 Injector Unknown     2,581   Y Y N 2.6.132 3 6 1992 132 Production Unknown     117   Y N N 2.6.133 3 6 1992 133 Production Unknown     1,887   Y N N 2.6.134 3 6 1992 134 Injector Unknown     1,981   Y N N 2.6.135 3 6 1992 135 Production Unknown     1,829   Y N N 2.6.136 3 6 1993 136 Observation Unknown     2,438   N N N 2.6.137 3 6 1993 137 Production Unknown     1,188   Y N N 2.6.138 3 6 1993 138 Production Unknown     1,248   Y Y N 2.6.139 3 6 1993 139 Production Unknown     1,707   Y N N 2.6.140 3 6 1993 140 Production Unknown     1,462   Y N N 2.6.141 3 6 1993 141 Production Unknown     1,823   Y N N 2.6.142 3 6 1994 142 Production Unknown     1,421   Y N N 2.6.143 3 6 1994 143 Production Unknown     1,779   Y N N 2.6.144 3 6 1994 144 Production Unknown     1,981   Y N N 2.6.145 3 6 1995 145 Production Unknown     1,981   Y N N 2.6.146 3 6 1995 146 Production Unknown     1,981   Y N N 2.6.147 3 6 1995 147 Abandoned Unknown     2,289   N Y N 2.6.148 3 6 1995 148 Production Unknown     1,511   Y N N 63 Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 2.6.149 3 6 2008 149 Non-commercial Unknown 3.90 1983 1,594   Y N N 2.6.150 3 6   150 Production Unknown     1,190   Y N N 2.6.151 3 6   151 Unknown Unknown     2,538   N N N 2.6.152 3 6   152 Non-commercial Unknown     1,831   N N N 2.7.1 3 6   1 Unknown Unknown 16.80 12/1/1998     Y N N 2.7.2 3 6   2 Unknown Unknown 14.00 11/24/1998     Y N N 2.7.3 3 6   3 Unknown Unknown 11.20 8/14/1998     Y N N 2.7.4 3 6   4 Unknown Unknown 3.90 8/30/1997     Y N N 2.7.5 3 6   5 Unknown Unknown 7.60 2/5/1998     Y N N 2.7.6 3 6   6 Unknown Unknown 11.30 1/12/1998     Y N N 2.7.7 3 6   7 Unknown Unknown 5.80 8/11/1998     Y N N 2.7.8 3 6   8 Unknown Unknown 10.30 4/11/1999     Y N N 2.7.9 3 6   9 Unknown Unknown 13.30 12/15/1996     Y N N 2.7.10 3 6   10 Unknown Unknown 9.00 6/2010     Y N N 2.7.11 3 6   11 Unknown Unknown 1.70 7/2007     N Y N 2.7.12 3 6   12 Unknown Unknown 7.50 1/10/1998     Y N N 2.7.13 3 6   13 Unknown Unknown 3.60 1980     Y Y N 2.7.14 3 6   14 Unknown Unknown 10.30 9/3/1998     Y Y N 2.7.15 3 6   15 Unknown Unknown 16.10 4/21/1999     Y N N 2.7.16 3 6   16 Unknown Unknown 9.80 1/10/1998     Y N N 2.7.17 3 6   17 Unknown Unknown 6.20 8/11/1998     Y N N 2.7.18 3 6   18 Unknown Unknown 11.90 8/21/1998     Y N N 2.7.19 3 6   19 Unknown Unknown 11.60 6/19/2009     Y N N 2.7.20 3 6   20 Unknown Unknown 8.20 1/21/2009     Y N N 2.7.21 3 6   21 Unknown Unknown 2.60 1/10/2010     Y N N 2.7.22 3 6   22 Unknown Unknown 1.90 7/2010     N N N 2.7.23 3 6   23 Unknown Unknown 1.70 10/23/2010     N N N 2.7.24 3 6   24 Unknown Unknown 12.60 9/3/1998     Y N N 2.7.25 3 6   25 Unknown Unknown 3.40 8/14/2003     Y N N 2.7.26 3 6   26 Unknown Unknown 2.10 10/18/2006     Y N N 2.7.27 3 6   27 Unknown Unknown         N N N 2.8.1 3 6   1 Unknown Unknown 23.00 7/1998     Y N N 2.8.2 3 6   2 Unknown Unknown 12.10 8/1998     Y N N 2.8.3 3 6   3 Unknown Unknown 9.70 9/1980     Y N N 2.8.4 3 6   4 Unknown Unknown 10.20 2/1995     Y N N 2.8.5 3 6   5 Unknown Unknown 14.40 11/1996     Y N N 2.8.6 3 6   6 Unknown Unknown 28.00 6/1996     Y Y N 2.8.7 3 6   7 Unknown Unknown 8.60 3/1999     Y N N 2.8.8 3 6   8 Unknown Unknown 30.10 8/1996     Y N N 2.8.9 3 6   9 Unknown Unknown 24.40 5/1997     Y N N 2.8.10 3 6   10 Unknown Unknown 15.10 12/1996     Y N N 2.8.11 3 6   11 Unknown Unknown 11.60 1/1998     Y N N 2.8.12 3 6   12 Unknown Unknown 3.60 7/2006     Y N N 2.8.13 3 6   13 Unknown Unknown 11.10 5/2007     Y N N 2.8.14 3 6   14 Unknown Unknown 14.30 7/2006     Y N N 2.8.15 3 6   15 Unknown Unknown 7.10 1/2006     Y N N 2.8.16 3 6   16 Unknown Unknown 9.60 10/1996     Y N N 2.8.17 3 6   17 Unknown Unknown 10.90 10/1996     Y Y N 2.8.18 3 6   18 Unknown Unknown 6.20 1/1998     Y N N 2.8.19 3 6   19 Unknown Unknown 6.30 8/1996     Y N N 2.8.20 3 6   20 Unknown Unknown 6.60 1/1998     Y N N 2.8.21 3 6   21 Unknown Unknown 7.60 4/1982     Y N N 2.8.22 3 6   22 Unknown Unknown 12.90 1/1996     Y N N 2.8.23 3 6   23 Unknown Unknown 8.80 1/1998     Y N N 2.8.24 3 6   24 Unknown Unknown 15.00 9/1996     Y N N 2.8.25 3 6   25 Unknown Unknown 4.00 1/2004     Y N N 3.1.1 3 5 1997 3 Unknown Unknown 0.00   2,826   N N N 3.1.2 3 5 1997 2 Unknown Unknown 0.00   2,979   N N N 3.1.3 3 5 1998 4 Unknown Unknown 3.50   2,748   Y N N 3.1.4 3 5 1995 1 Unknown Unknown 4.20   1,550   Y N N 3.2.1 3 7 1977 1 Unknown Unknown     762   N N N 3.2.2 3 7 1977 2 Unknown Unknown     1,010   N Y N 3.2.3 3 7 1977 3 Unknown Unknown     760   N N N 3.2.4 3 7 1988 4 Unknown Unknown     2,583   N N N 3.2.5 3 7 1988 5 Unknown Unknown     2,324   N Y N 3.2.6 3 7 1988 6 Unknown Unknown     1,820   N N N 3.2.7 3 7   7 Unknown Unknown 5.30   1,521   Y N N 3.2.8 3 7   8 Unknown Unknown 10.70   1,592   Y N N 3.2.9 3 7   9 Unknown Unknown 13.30   1,974   Y N N 3.2.10 3 7   10 Unknown Unknown 6.30   1,906   Y N N 3.2.11 3 7   11 Unknown Unknown 32.00   1,488   Y N N 3.2.12 3 7   12 Unknown Unknown 17.50   1,858   Y N N 3.2.13 3 7   13 Unknown Unknown 17.50   1,750   Y N N 3.2.14 3 7   14 Unknown Unknown 3.40   1,911   Y N N 3.3.1 3 5 1978 1 Unknown Unknown     1,903   N N N 3.3.2 3 5 1979 2 Unknown Unknown 4.80   1,662   Y N N 3.3.3 3 5 1981 3 Unknown Unknown     1,946   N N N 64 Success of Geothermal Wells: A Global Study Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 3.3.4 3 5 1981 4 Unknown Unknown 11.20   1,911   Y N N 3.3.5 3 5 1982 5 Unknown Unknown     2,501   N N N 3.3.6 3 5 1982 6 Unknown Unknown 10.40   2,501   Y N N 3.3.7 3 5 1983 7 Unknown Unknown 8.20   2,401   Y N N 3.3.8 3 5 1984 8 Unknown Unknown 2.60   2,450   N N N 3.3.9 3 5 1984 9 Unknown Unknown 3.70   2,300   Y N N 3.3.10 3 5 1985 10 Unknown Unknown 4.00   1,866   Y N N 3.3.11 3 5 1985 11 Unknown Unknown 0.00   2,431   N N N 3.3.12 3 5 1985 12 Unknown Unknown     2,104   N N N 3.3.13 3 5 1986 13 Unknown Unknown     2,449   N Y N 3.3.14 3 5 1986 14 Unknown Unknown 7.20   1,853   Y N N 3.3.15 3 5 1990 15 Unknown Unknown 2.70   1,890   N N N 3.3.16 3 5 1990 16 Unknown Unknown     2,073   N N N 3.3.17 3 5 1991 17 Unknown Unknown     2,502   N N N 3.3.18 3 5 1991 18 Unknown Unknown     2,252   N N N 3.3.19 3 5 1991 19 Unknown Unknown     2,700   N N N 3.3.20 3 5 1991 20 Unknown Unknown 8.20   2,348   Y N N 3.3.21 3 5 1991 21 Unknown Unknown     2,372   N N N 3.3.22 3 5 1991 22 Unknown Unknown 4.50   2,176   Y N N 3.3.23 3 5 1992 23 Unknown Unknown     2,118   N N N 3.3.24 3 5 1992 24 Unknown Unknown     2,039   N N N 3.3.25 3 5 1992 25 Unknown Unknown     1,991   N N N 3.3.26 3 5 1993 26 Unknown Unknown     2,410   N N N 3.3.27 3 5 1993 27 Unknown Unknown     2,431   N N N 3.3.28 3 5 1993 28 Unknown Unknown     2,396   N N N 3.3.29 3 5 1995 29 Unknown Unknown 7.90 10/31/997 2,635   Y Y N 3.3.30 3 5 1996 30 Unknown Unknown 0.00   2,359   N Y N 3.3.31 3 5 1996 31 Unknown Unknown 0.00   2,604   N Y N 3.3.32 3 5 1996 32 Unknown Unknown 0.00   2,380   N N N 3.3.33 3 5 1996 33 Unknown Unknown 2.60 10/31/1997 2,726   N Y N 3.3.34 3 5 1996 34 Unknown Unknown     1,209   N Y N 3.3.35 3 5 1996 35 Unknown Unknown 16.70 10/31/1997 2,366   Y Y N 3.3.36 3 5 1996 36 Unknown Unknown 5.90 10/31/1997 2,753   Y N N 3.3.37 3 5 1996 37 Unknown Unknown 23.00 10/31/1997 2,570   Y Y N 3.3.38 3 5 1997 38 Unknown Unknown 15.30   2,717   Y N N 3.3.39 3 5 1997 39 Unknown Unknown 18.00 10/31/1997 2,622   Y Y N 3.3.40 3 5 1997 40 Unknown Unknown 18.00 10/31/1997 2,300   Y Y N 3.3.41 3 5 1997 41 Unknown Unknown 7.00 10/31/1997 2,641   Y N N 3.3.42 3 5 1997 42 Unknown Unknown 21.00 10/31/1997 2,591   Y N N 3.3.43 3 5 1997 43 Unknown Unknown 6.80 10/31/1997 2,640   Y Y N 3.3.44 3 5 1997 44 Unknown Unknown 2.00   3,214   N N N 3.3.45 3 5 1997 45 Unknown Unknown 9.00   2,623   Y N N 3.3.46 3 5 1997 46 Unknown Unknown 18.00   2,566   Y Y N 3.3.47 3 5 1998 47 Unknown Unknown 21.60   2,588   Y Y N 3.4.1 3 7 07/1990 47 Unknown Unknown 2.50   550   Y N N 3.4.2 3 7 08/1975 5 Unknown Unknown     233   N N N 3.4.3 3 7 1976 6 Unknown Unknown 10.60   314   Y N N 3.4.4 3 7 07/1977 7 Unknown Unknown 2.80   457   Y N N 3.4.5 3 7 02/1996 78 Unknown Unknown     457   N N N 3.4.6 3 7 1977 9 Unknown Unknown 7.60   305   Y N N 3.4.7 3 7 04/1978 8 Unknown Unknown     549   N N N 3.4.8 3 7 09/1978 10 Unknown Unknown     390   N N N 3.4.9 3 7 1978 12 Unknown Unknown 9.00   326   Y N N 3.4.10 3 7 1979 13 Unknown Unknown 14.80   285   Y N N 3.4.11 3 7 07/1979 14 Unknown Unknown     413   N N N 3.4.12 3 7 03/1981 15 Unknown Unknown 2.30   382   Y N N 3.4.13 3 7 12/1981 18 Unknown Unknown     616   N N N 3.4.14 3 7 1981 17 Unknown Unknown 11.80   373   Y N N 3.4.15 3 7 12/1983 27 Unknown Unknown     554   N N N 3.4.16 3 7 1982 19 Unknown Unknown 5.90   671   Y N N 3.4.17 3 7 1982 20 Unknown Unknown 3.40   559   Y N N 3.4.18 3 7 1983 21 Unknown Unknown 11.40   396   Y N N 3.4.19 3 7 1983 22 Unknown Unknown 11.50   379   Y N N 3.4.20 3 7 1983 23 Unknown Unknown 7.00   371   Y N N 3.4.21 3 7 1983 24 Unknown Unknown 5.10   366   Y N N 3.4.22 3 7 1983 26 Unknown Unknown 4.00   366   Y N N 3.4.23 3 7 1983 25 Unknown Unknown 5.90   396   Y N N 3.4.24 3 7 03/1988 43 Unknown Unknown     587   N N N 3.4.25 3 7 1988 44 Unknown Unknown 2.90   351   Y N N 3.4.26 3 7 1984 29 Unknown Unknown 6.30   344   Y N N 3.4.27 3 7 1984 30 Unknown Unknown 4.00   381   Y N N 3.4.28 3 7 1984 31 Unknown Unknown 14.80   381   Y N N 3.4.29 3 7 1987 42 Unknown Unknown 9.10   427   Y N N 3.4.30 3 7 1984 32 Unknown Unknown 5.00   439   Y N N 3.4.31 3 7 1984 33 Unknown Unknown 3.10   427   Y N N 3.4.32 3 7 1984 34 Unknown Unknown 3.30   462   Y N N 3.4.33 3 7 1985 36 Unknown Unknown 11.80   389   Y N N 65 Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 3.4.34 3 7 1985 37 Unknown Unknown 9.00   435   Y N N 3.4.35 3 7 1985 38 Unknown Unknown 5.80   352   Y N N 3.4.36 3 7 1986 39 Unknown Unknown 6.60   428   Y N N 3.4.37 3 7 1986 40 Unknown Unknown 3.70   449   Y N N 3.4.38 3 7 1987 41 Unknown Unknown 5.00   430   Y N N 3.4.39 3 7 10/1991 48 Unknown Unknown     461   N N N 3.4.40 3 7 08/1989 45 Unknown Unknown     487   N Y N 3.4.41 3 7 1989 46 Unknown Unknown 9.10   419   Y N N 3.4.42 3 7 1991 50 Unknown Unknown 6.70   461   Y N N 3.4.43 3 7 10/1991 49 Unknown Unknown     457   N N N 3.4.44 3 7 03/1992 51 Unknown Unknown 10.70   396   Y N N 3.4.45 3 7 1992 52 Unknown Unknown 5.50   457   Y N N 3.4.46 3 7 1992 53 Unknown Unknown 8.00   396   Y N N 3.4.47 3 7 05/1993 54 Unknown Unknown     549   N N N 3.4.48 3 7 10/1993 55 Unknown Unknown 2.00   411   Y N N 3.4.49 3 7 01/1994 56 Unknown Unknown 2.10   306   Y N N 3.4.50 3 7 1994 57 Unknown Unknown 4.30   369   Y N N 3.4.51 3 7 1994 58 Unknown Unknown 5.00   411   Y N N 3.4.52 3 7 1994 59 Unknown Unknown 8.00   396   Y N N 3.4.53 3 7 10/1974 1 Unknown Unknown     188   N N N 3.4.54 3 7 07/1995 60 Unknown Unknown     411   N N N 3.4.55 3 7 1995 61 Unknown Unknown 11.20   397   Y N N 3.4.56 3 7 1995 62 Unknown Unknown 11.00   335   Y N N 3.4.57 3 7 1996 63 Unknown Unknown 9.50   457   Y N N 3.4.58 3 7 04/1996 64 Unknown Unknown     610   N N N 3.4.59 3 7 05/1996 66 Unknown Unknown 3.37   366   Y N N 3.4.60 3 7 09/1996 67 Unknown Unknown 2.60   439   Y N N 3.4.61 3 7 09/1996 68 Unknown Unknown 6.60   366   Y N N 3.4.62 3 7 12/1996 69 Unknown Unknown 3.50   416   Y N N 3.4.63 3 7 02/1975 2 Unknown Unknown 2.30   163   Y N N 3.4.64 3 7 04/1975 3 Unknown Unknown     195   N N N 3.4.65 3 7 06/1975 4 Unknown Unknown     233   N N N 3.4.66 3 7   70 Unknown Unknown 3.40   390   Y N N 3.4.67 3 7   71 Unknown Unknown 3.40   367   Y N N 3.4.68 3 7   72 Unknown Unknown 7.40   397   Y N N 3.4.69 3 7   73 Unknown Unknown 9.20   429   Y N N 3.4.70 3 7   74 Unknown Unknown 3.10   457   Y N N 3.4.71 3 7   75 Unknown Unknown 2.60   458   Y N N 3.4.72 3 7   76 Unknown Unknown 7.20   489   Y N N 3.4.73 3 7   77 Unknown Unknown 8.30   549   Y N N 3.4.74 3 7   11 Unknown Unknown         N N N 3.4.75 3 7   79 Unknown Unknown 7.00   525   Y N N 3.4.76 3 7   16 Unknown Unknown         N N N 3.4.77 3 7   28 Unknown Unknown         N N N 3.4.78 3 7   35 Unknown Unknown     610   N N N 3.4.79 3 7 05/1991 65 Unknown Unknown     507   N N N 3.5.1 3 5 1996 1 Unknown Unknown     2,500   N Y N 3.5.2 3 5 1996 2 Unknown Unknown     2,158   N N N 3.5.3 3 5 1996 3 Unknown Unknown     1,029   N N N 3.5.4 3 5 1996 4 Unknown Unknown     1,388   N N N 3.5.5 3 5 1996 5 Unknown Unknown     2,741   Y Y N 3.5.6 3 5 1997 6 Unknown Unknown     1,324   N N N 3.5.7 3 5 1997 7 Unknown Unknown     1,406   N N N 3.5.8 3 5 1997 8 Unknown Unknown 12.50   1,854   Y N N 3.5.9 3 5 1997 9 Unknown Unknown     3,076   N Y N 3.5.10 3 5 1997 10 Unknown Unknown     3,040   N Y N 3.5.11 3 5 1997 11 Unknown Unknown     1,671   N N N 3.5.12 3 5 1997 12 Unknown Unknown 1.70   1,397   N N N 3.5.13 3 5 1997 13 Unknown Unknown     1,579   N N N 3.5.14 3 5 1997 14 Unknown Unknown     2,181   N N N 3.5.15 3 5 1997 15 Unknown Unknown     1,340   Y N N 3.5.16 3 5 1997 16 Unknown Unknown     2,417   Y Y N 3.5.17 3 5 1997 17 Unknown Unknown     1,603   Y N N 3.5.18 3 5 1997 18 Unknown Unknown 4.20   2,443   Y N N 3.5.19 3 5 1997 19 Unknown Unknown     1,825   N N N 3.5.20 3 5 1997 20 Unknown Unknown 5.00   1,781   Y Y N 3.5.21 3 5 1997 21 Unknown Unknown 0.80   2,039   N N N 3.5.22 3 5 1997 22 Unknown Unknown 2.60   2,588   N N N 3.5.23 3 5 1998 23 Unknown Unknown 7.00   2,479   Y N N 3.6.1 3 5 1996 1 Production Unknown 12.50 5/13/1997 1,018   Y N N 3.6.2 3 5 1997 2 Non-commercial Unknown     2,701   N N N 3.6.3 3 5 1997 3 Production Unknown 9.20 7/2/1997 2,089   Y N N 3.6.4 3 5 1997 4 Production Unknown 8.80 6/2/1997 1,760   Y Y N 3.6.5 3 5 1997 5 Production Unknown 13.70 3/13/1997 1,464   Y N N 3.6.6 3 5 1997 6 Production Unknown 9.00 6/6/1997 995   Y Y N 3.6.7 3 5 1997 7 Production Unknown 15.50 7/11/1997 1,154   Y N N 3.6.8 3 5 1997 8 Production Unknown 4.00 7/20/1997 2,172   Y Y N 66 Success of Geothermal Wells: A Global Study Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 3.6.9 3 5 1997 9 Non-commercial Unknown     1,755   N Y N 3.6.10 3 5 1997 10 Non-commercial Unknown     1,628   N Y N 3.6.11 3 5 1997 11 Production Unknown 7.00 2/12/1998 1,618   Y Y N 3.6.12 3 5 1997 12 Non-commercial Unknown     2,537   N Y N 3.6.13 3 5 1998 13 Suspended Unknown     974   NA N N 3.6.14 3 5 1998 14 Production Unknown 13.00 1/22/1998 1,700   Y N N 3.7.1 3 6   1 Unknown Unknown     634   N N N 3.7.2 3 6   2 Unknown Unknown     743   N N N 3.7.3 3 6   3 Unknown Unknown     386   N N N 3.7.4 3 6   4 Unknown Unknown     501   N N N 3.7.5 3 6   5 Unknown Unknown     619   N N N 3.7.6 3 6   6 Unknown Unknown 40.00   710   Y Y N 3.7.7 3 6   7 Unknown Unknown 52.00   658   Y N N 3.7.8 3 6   8 Unknown Unknown     668   N N N 3.7.9 3 6   9 Unknown Unknown 9.00   679   Y N N 3.7.10 3 6   10 Unknown Unknown 30.00   525   Y N N 3.7.11 3 6   11 Unknown Unknown 25.00   406   Y Y N 3.7.12 3 6   12 Unknown Unknown 27.00   518   Y N N 3.7.13 3 6   13 Unknown Unknown 16.00   512   Y N N 3.8.1 3 6 1986 1 Unknown Unknown 15.50   2,306   Y N N 3.8.2 3 6 1996 2 Unknown Unknown 4.00   2,503   Y N N 3.8.3 3 6 1996 3 Unknown Unknown 2.60   1,441   Y N N 3.8.4 3 6 1996 4 Unknown Unknown     2,165   N N N 3.8.5 3 6 1996 5 Unknown Unknown 2.00   1,300   Y Y N 3.8.6 3 6 1996 6 Unknown Unknown 4.50   2,049   Y N N 3.8.7 3 6 08/1996 7 Unknown Unknown 1.50   1,182   N Y N 3.8.8 3 6 09/1996 8 Unknown Unknown 4.50   2,049   Y Y N 3.8.9 3 6 1996 9 Unknown Unknown 11.00   1,650   Y N N 3.8.10 3 6 12/1996 10 Unknown Unknown     2,153   N N N 3.8.11 3 6 1997 11 Unknown Unknown     2,134   N N N 3.8.12 3 6 1997 12 Unknown Unknown 24.30   1,613   Y N N 3.8.13 3 6 1997 13 Unknown Unknown 8.00   2,500   Y N N 3.8.14 3 6 1997 14 Unknown Unknown     2,255   N Y N 3.8.15 3 6 1997 15 Unknown Unknown 9.50   1,630   Y Y N 3.8.16 3 6 10/1997 16 Unknown Unknown 19.70   2,510   Y Y N 3.8.17 3 6 10/1997 17 Unknown Unknown 20.80   2,246   Y N N 3.8.18 3 6 10/1997 18 Unknown Unknown 28.20   1,600   Y N N 3.8.19 3 6 11/1997 19 Unknown Unknown 12.30   1,527   Y N N 3.8.20 3 6 12/1997 20 Unknown Unknown     1,430   N N N 3.8.21 3 6 12/1997 21 Unknown Unknown     2,050   N N N 3.8.22 3 6 12/1997 22 Unknown Unknown 14.80   1,600   Y N N 3.8.23 3 6 12/1997 23 Unknown Unknown 15.50   2,306   Y N N 3.8.24 3 6 01/1998 24 Unknown Unknown     1,800   N N N 3.8.25 3 6 01/1998 25 Unknown Unknown     2,355   N N N 3.8.26 3 6 01/1998 26 Unknown Unknown 14.20   2,510   Y N N 3.8.27 3 6 02/1998 27 Unknown Unknown 18.50   1,307   Y N N 3.8.28 3 6 03/1998 28 Unknown Unknown 6.60   2,329   Y N N 3.8.29 3 6 11/2003 29 Unknown Unknown     1,484   N N N 3.8.30 3 6 09/2006 30 Unknown Unknown 30.80   1,347   Y N N 3.8.31 3 6 01/2007 31 Unknown Unknown 11.00   1,650   Y N N 3.8.32 3 6 03/2007 32 Unknown Unknown 24.30   1,613   Y N N 3.8.33 3 6 05/2007 33 Unknown Unknown 28.20   1,600   Y N N 3.8.34 3 6 06/2007 34 Unknown Unknown 23.00   1,310   Y N N 3.8.35 3 6 06/2007 35 Unknown Unknown 27.30   1,710   Y N N 3.8.36 3 6 09/2007 36 Unknown Unknown 19.20   1,387   Y N N 4.1.1 3 5   1 Unknown Unknown 2.50 1990 1,660 244 mm to 854 m N N N 4.1.2 3 5   2 Unknown Unknown 2.50 1990 1,758 244 mm to 964 m N N N 4.1.3 3 5   3 Unknown Unknown 3.70 1990 1,655 244 mm to 912 m Y N N 4.1.4 3 5   4 Unknown Unknown 3.70 1990 1,560 244 mm to 810 m Y N N 4.1.5 3 5   5 Unknown Unknown 4.00 1990 1,662 244 mm to 899 m Y N N 4.1.6 3 5   6 Unknown Unknown 4.90 1990 1,655 244 mm to 806 m Y N N 4.1.7 3 5   7 Unknown Unknown 9.00 1990 2,011 244 mm to 950 m Y N N 4.1.8 3 5   8 Unknown Unknown 10.00 1990 2,609 244 mm to 1,500 m Y N N 4.1.9 3 5   9 Unknown Unknown 11.70 1990 1,860 244 mm to 967 m Y Y N 4.1.10 3 5   10 Unknown Unknown     1,005 89 mm to 503 m NA N N 4.1.11 3 5   11 Unknown Unknown     1,004 76 mm to 507 m NA N N 4.1.12 3 5   12 Unknown Unknown     1,500 102 mm to 1,005 m NA N N 4.1.13 3 5   13 Unknown Unknown     1,305 76 mm to 1,000 m NA N N 4.1.14 3 5   14 Unknown Unknown     1,007 76 mm to 500 m NA N N 4.1.15 3 5   15 Unknown Unknown     1,500 90 mm to 1,004 m NA N N 4.1.16 3 5   16 Unknown Unknown     1,004 102 mm to 701 m NA N N 4.1.17 3 5   17 Unknown Unknown         Y N N 4.1.18 3 5   18 Unknown Unknown         Y N N 4.1.19 3 5   19 Unknown Unknown         Y N N 4.1.20 3 5   20 Unknown Unknown         Y N N 4.1.21 3 5   21 Unknown Unknown         Y N N 4.1.22 3 5   22 Unknown Unknown         Y N N 67 Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 4.1.23 3 5   23 Unknown Unknown         Y N N 4.1.24 3 5   24 Unknown Unknown         N N N 4.1.25 3 5   25 Unknown Unknown         N N N 4.1.26 3 5   26 Unknown Unknown         N N N 4.1.27 3 5   27 Unknown Unknown     1,655 114 mm to 404 m N Y N 4.1.28 3 5   28 Unknown Unknown     1,505 340 mm to 600 m N N N 4.1.29 3 5   29 Unknown Unknown     1,460 340 mm to 605 m N N N 4.2.1 3 6 9/1/1980 1 Unknown Unknown 2.50   1,150   N N N 4.2.2 3 6 9/7/1982 2 Unknown Unknown 5.40   1,400   Y N N 4.2.3 3 6 8/9/1983 3 Unknown Unknown 2.70   1,405   N N N 4.2.4 3 6 8/16/1985 5 Unknown Unknown 4.10   1,679   Y N N 4.2.5 3 6 6/23/1985 4 Unknown Unknown 3.20   1,711   Y N N 4.2.6 3 6 9/23/1986 7 Unknown Unknown 1.70   1,849   N Y N 4.2.7 3 6 11/13/1986 8 Unknown Unknown 0.50   1,800   N Y N 4.2.8 3 6 7/24/1986 6 Unknown Unknown 5.50   1,777   Y N N 4.2.9 3 6 10/29/1991 10 Unknown Unknown 2.50   2,013   N N N 4.2.10 3 6 8/16/1991 9 Unknown Unknown 1.60   2,230   N N N 4.2.11 3 6   11 Unknown Unknown     1,166   NA N N 4.2.12 3 6   12 Unknown Unknown     1,684   NA N N 4.2.13 3 6   13 Unknown Unknown     1,003   Y N N 4.2.14 3 6   14 Unknown Unknown     1,087   Y N N 4.2.15 3 6   15 Unknown Unknown     1,094   NA N N 4.2.16 3 6   16 Unknown Unknown     1,500   NA Y N 4.2.17 3 6   17 Unknown Unknown     1,493   NA N N 4.2.18 3 6   18 Unknown Unknown     1,500   NA N N 4.2.19 3 6   19 Unknown Unknown     1,500   NA N N 5.1.1 5 4 1982 1 Unknown Unknown     1,001   N N N 5.1.2 5 4 1982 2 Unknown Unknown     976   N N N 5.1.3 5 4 1983 3 Unknown Unknown     1,195   Y N N 5.1.4 5 4 1984 4 Unknown Unknown     285   NA N N 5.1.5 5 4 1984 5 Unknown Unknown 5.20   1,302   Y N N 5.1.6 5 4 1984 6 Unknown Unknown 5.40   1,100   Y N N 5.1.7 5 4 1985 7 Unknown Unknown     2,398   Y N N 5.1.8 5 4 1986 8 Unknown Unknown     2,000   N N N 5.1.9 5 4 1986 9 Unknown Unknown     1,464   N N N 5.1.10 5 4   10 Unknown Unknown 5.50   1,518   Y N N 5.1.11 5 4   11 Unknown Unknown 4.53   960   Y N N 5.1.12 5 4   12 Unknown Unknown 11.10   1,200   Y N N 5.1.13 5 4   13 Unknown Unknown 5.70   1,701   Y N N 5.1.14 5 4   14 Unknown Unknown 5.10   1,646   Y N N 5.1.15 5 4   15 Unknown Unknown     2,255   N N N 5.1.16 5 4   16 Unknown Unknown     1,247   NA N N 5.1.17 5 4   17 Unknown Unknown     1,833   NA N N 5.1.18 5 4   18 Unknown Unknown     2,427   NA N N 5.1.19 5 4   19 Unknown Unknown     1,654   NA N N 5.2.1 5 4 1968 1 Abandoned Abandoned     540 178 mm to 450 m N N N 5.2.2 5 4 1969 3 Abandoned Injector     655 244 mm to 405 m Y Y N 5.2.3 5 4 1968 2 Non-commercial Injector     991 168 mm to 650 m Y Y N 5.2.4 5 4 1969 4 Non-commercial Abandoned     370 244 mm to 258 m N N N 5.2.5 5 4 1969 6 Non-commercial Abandoned     486 244 mm to 314 m N N N 5.2.6 5 4 1970 7 Production Observation     851 168 mm to 526 m Y Y N 5.2.7 5 4 1971 12 Production Observation     668 168 mm to 531 m Y Y N 5.2.8 5 4 1970 8 Abandoned Observation     620 244 mm to 505 m N N N 5.2.9 5 4 1970 9 Non-commercial Abandoned     1,241 168 mm to 734 m N N N 5.2.10 5 4 1970 10 Non-commercial Abandoned     405 244 mm to 300 m N N N 5.2.11 5 4 1971 13 Production Production 1.20   760 244 mm to 597 m Y N N 5.2.12 5 4 1970 11 Production Production 2.10   597 244 mm to 456 m Y N N 5.2.13 5 4 1971 14 Production Production 1.60   510 244 mm to 389 m Y N N 5.2.14 5 4 1973 15 Production Production 2.50   667 244 mm to 497 m Y N N 5.2.15 5 4 1975 16 Abandoned Observation     365   N N N 5.2.16 5 4 1986 19 Production Production 1.50   810 244 mm to 496 m Y N N 5.2.17 5 4 1985 17 Production Production 2.00   898 244 mm to 458 m Y N N 5.2.18 5 4 1985 18 Production Production 1.70   888 244 mm to 567 m Y N N 5.2.19 5 4 1969 5 Non-commercial Abandoned     505 168 mm to 313 m N N N 5.2.20 5 4 1998 20 Production Idle     2,261 244 mm to 1,167 m Y N N 5.2.21 5 4 2001 21 Injector Injector     1,482 340 mm to 780 m Y N N 5.2.22 5 4 2006 22 Production Production 2.00   2,250 244 mm to 1,001 m Y N N 5.2.23 5 4 2009 23 Production Idle     2,184 244 mm to 1,078 m Y N N 5.2.24 5 4 2010 24 Unknown Idle     1,468 244 mm to 1,143 m N N N 5.2.25 5 4 2010 25 Production Idle     2,703 244 mm to 1,691 m Y N N 6.1.1 4 6 1964 1 Unknown Unknown         Y Y N 6.1.2 4 6 1966 2 Unknown Unknown         N Y N 6.1.3 4 6 1967 3 Unknown Unknown         Y Y N 6.1.4 4 6 1967 4 Unknown Unknown         N N N 6.1.5 4 6 1967 5 Unknown Unknown         Y Y N 6.1.6 4 6 1967 6 Unknown Unknown         Y Y N 6.1.7 4 6 1968 7 Unknown Unknown         Y Y N 68 Success of Geothermal Wells: A Global Study Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 6.1.8 4 6 1972 8 Unknown Unknown         Y Y N 6.1.9 4 6 1972 9 Unknown Unknown         Y N N 6.1.10 4 6 1972 10 Unknown Unknown         Y Y N 6.1.11 4 6 1972 11 Unknown Unknown         Y N N 6.1.12 4 6 1972 12 Unknown Unknown         Y N N 6.1.13 4 6 1972 13 Unknown Unknown         Y N N 6.1.14 4 6 1973 14 Unknown Unknown         N Y N 6.1.15 4 6 1973 15 Unknown Unknown         Y Y N 6.1.16 4 6 1973 16 Unknown Unknown         N Y N 6.1.17 4 6 1973 17 Unknown Unknown         Y Y N 6.1.18 4 6 1973 18 Unknown Unknown         Y N N 6.1.19 4 6 1973 19 Unknown Unknown         Y Y N 6.1.20 4 6 1973 20 Unknown Unknown         Y Y N 6.1.21 4 6 1974 21 Unknown Unknown         Y Y N 6.1.22 4 6 1974 22 Unknown Unknown 3.90       Y Y N 6.1.23 4 6 1974 23 Unknown Unknown 3.99       Y Y N 6.1.24 4 6 1977 24 Unknown Unknown 6.01       Y Y N 6.1.25 4 6 1977 25 Unknown Unknown 9.43       Y Y N 6.1.26 4 6 1977 26 Unknown Unknown 10.00       Y Y N 6.1.27 4 6 1977 27 Unknown Unknown 9.42       Y N N 6.1.28 4 6 1977 28 Unknown Unknown 8.94       Y Y N 6.1.29 4 6 1978 29 Unknown Unknown         Y Y N 6.1.30 4 6 1978 30 Unknown Unknown 5.69       Y Y N 6.1.31 4 6 1978 31 Unknown Unknown 8.39       Y Y N 6.1.32 4 6 1978 32 Unknown Unknown 5.21       Y Y N 6.1.33 4 6 1978 33 Unknown Unknown         Y Y N 6.1.34 4 6 1978 34 Unknown Unknown         Y Y N 6.1.35 4 6 1979 35 Unknown Unknown         NA N N 6.1.36 4 6 1979 36 Unknown Unknown         Y Y N 6.1.37 4 6 1979 37 Unknown Unknown         Y Y N 6.1.38 4 6 1979 38 Unknown Unknown         NA Y N 6.1.39 4 6 1980 39 Unknown Unknown         Y Y N 6.1.40 4 6 1980 40 Unknown Unknown         Y N N 6.1.41 4 6 1981 41 Unknown Unknown         Y Y N 6.1.42 4 6 1981 42 Unknown Unknown         N Y N 6.1.43 4 6 1981 43 Unknown Unknown         Y Y N 6.1.44 4 6 1981 44 Unknown Unknown         Y N N 6.1.45 4 6 1982 45 Unknown Unknown         Y Y N 6.1.46 4 6 1982 46 Unknown Unknown         Y N N 6.1.47 4 6 1982 47 Unknown Unknown         NA Y N 6.1.48 4 6 1982 48 Unknown Unknown 1.90       N N N 6.1.49 4 6 1982 49 Unknown Unknown         Y Y N 6.1.50 4 6 1982 50 Unknown Unknown         Y Y N 6.1.51 4 6 1982 51 Unknown Unknown         Y N N 6.1.52 4 6 1982 52 Unknown Unknown 6.78       Y N N 6.1.53 4 6 1983 53 Unknown Unknown         Y N N 6.1.54 4 6 1983 54 Unknown Unknown         Y N N 6.1.55 4 6 1984 55 Unknown Unknown 3.77       Y Y N 6.1.56 4 6 1984 56 Unknown Unknown 7.91       Y N N 6.1.57 4 6 1984 57 Unknown Unknown 2.31       N Y N 6.1.58 4 6 1984 58 Unknown Unknown 6.17       Y N N 6.1.59 4 6 1985 59 Unknown Unknown 2.58       N Y N 6.1.60 4 6 1985 60 Unknown Unknown 7.80       Y N N 6.1.61 4 6 1985 61 Unknown Unknown 2.78       N Y N 6.1.62 4 6 1986 62 Unknown Unknown 5.53       Y N N 6.1.63 4 6 1987 63 Unknown Unknown 8.10       Y N N 6.1.64 4 6 1987 64 Unknown Unknown 7.84       Y N N 6.1.65 4 6 1987 65 Unknown Unknown 5.32       Y N N 6.1.66 4 6 1988 66 Unknown Unknown 8.13       Y N N 6.1.67 4 6 1988 67 Unknown Unknown 9.27       Y Y N 6.1.68 4 6 1994 68 Unknown Unknown 8.69       Y N N 6.1.69 4 6 2004 69 Unknown Unknown         Y N N 6.1.70 4 6 2004 70 Unknown Unknown         Y N N 6.1.71 4 6 2005 71 Unknown Unknown         Y N N 6.1.72 4 6 2005 72 Unknown Unknown         Y N N 6.1.73 4 6 2005 73 Unknown Unknown         Y N N 6.1.74 4 6 2005 74 Unknown Unknown         Y N N 6.1.75 4 6 2005 75 Unknown Unknown         Y N N 6.1.76 4 6 2005 76 Unknown Unknown         Y N N 6.1.77 4 6 2005 77 Unknown Unknown         Y N N 6.1.78 4 6 2005 78 Unknown Unknown         Y N N 6.1.79 4 6 2005 79 Unknown Unknown         Y Y N 6.1.80 4 6 2005 80 Unknown Unknown         Y N N 6.1.81 4 6 2005 81 Unknown Unknown         Y N N 6.1.82 4 6 2005 82 Unknown Unknown         Y N N 6.1.83 4 6 2005 83 Unknown Unknown         Y N N 6.1.84 4 6 2005 84 Unknown Unknown         Y N N 69 Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 6.1.85 4 6 2005 85 Unknown Unknown         Y N N 6.1.86 4 6 2006 86 Unknown Unknown         Y Y N 6.1.87 4 6 2006 87 Unknown Unknown         Y N N 6.1.88 4 6 2006 88 Unknown Unknown         Y Y N 6.1.89 4 6 2006 89 Unknown Unknown         Y Y N 6.1.90 4 6 2006 90 Unknown Unknown         Y Y N 6.1.91 4 6 2008 91 Unknown Unknown         N N N 6.1.92 4 6 2008 92 Unknown Unknown         Y N N 6.1.93 4 6 2008 93 Unknown Unknown         NA N N 6.1.94 4 6 2008 94 Unknown Unknown         Y N N 6.1.95 4 6 2008 95 Unknown Unknown         Y N N 6.1.96 4 6 2008 96 Unknown Unknown         N N N 6.1.97 4 6 2008 97 Unknown Unknown         Y N N 6.1.98 4 6 2008 98 Unknown Unknown         Y N N 6.1.99 4 6 2008 99 Unknown Unknown         Y N N 6.1.100 4 6 2008 100 Unknown Unknown         Y N N 6.1.101 4 6 2008 101 Unknown Unknown         Y N N 6.1.102 4 6 2008 102 Unknown Unknown         Y N N 6.1.103 4 6 2009 103 Unknown Unknown         Y N N 6.1.104 4 6 2009 104 Unknown Unknown         N N N 6.1.105 4 6 2009 105 Unknown Unknown         N N N 6.1.106 4 6 2009 106 Unknown Unknown         N N N 6.1.107 4 6 2009 107 Unknown Unknown         Y N N 6.1.108 4 6 2009 108 Unknown Unknown         NA N N 6.1.109 4 6 2009 109 Unknown Unknown         NA N N 7.1.1 3 5 2/15/2002 3 Exploration Production     1,418   Y N N 7.1.2 3 5 10/6/2001 2 Exploration Production     1,764   Y N N 7.1.3 3 5 5/11/2001 1 Exploration Production     1,773   Y N N 7.1.4 3 5 6/15/2002 4 Exploration Production     1,419   Y N N 7.1.5 3 5 11/21/2002 5 Exploration Injector     1,827   Y N N 7.2.1 3 5   1 Unknown Unknown 5.60   1,300   Y N N 7.2.2 3 5   2 Unknown Unknown     2,025   N Y N 7.2.3 3 5   3 Unknown Unknown 8.10   1,150   Y N N 7.2.4 3 5   4 Unknown Unknown     2,300   N N N 7.2.5 3 5   5 Unknown Unknown 4.10   1,850   Y Y N 7.2.6 3 5 1999 6 Unknown Unknown     1,180   N N N 7.2.7 3 5   7 Unknown Unknown 14.80   1,150   Y N N 7.2.8 3 5   8 Unknown Unknown     1,900   N N N 7.2.9 3 5   9 Unknown Unknown 2.40   2,050   Y N N 7.2.10 3 5   10 Unknown Unknown 4.80   1,300   Y N N 7.2.11 3 5   11 Unknown Unknown     1,500   N N N 7.2.12 3 5   12 Unknown Unknown 3.00   1,400   Y N N 7.2.13 3 5   13 Unknown Unknown     3,000   NA Y N 7.2.14 3 5   14 Unknown Unknown 3.40   1,380   Y N N 7.2.15 3 5   15 Unknown Unknown 8.80   1,300   Y N N 7.2.16 3 5   16 Unknown Unknown     1,100   NA N N 7.2.17 3 5   17 Unknown Unknown 7.20   1,700   Y N N 7.2.18 3 5   18 Unknown Unknown 13.90   1,700   Y N N 7.2.19 3 5   19 Unknown Unknown 11.60   1,300   Y N N 7.2.20 3 5   20 Unknown Unknown 6.70   2,000   Y N N 7.2.21 3 5   21 Unknown Unknown     1,600   NA N N 7.2.22 3 5   22 Unknown Unknown 4.10   1,600   Y N N 7.2.23 3 5   23 Unknown Unknown     1,200   NA N N 7.2.24 3 5   24 Unknown Unknown         NA N N 7.2.25 3 5   25 Unknown Unknown 6.90   1,700   Y N N 7.2.26 3 5 2000 27 Unknown Unknown     923   N N N 7.2.27 3 5 2000 26 Unknown Unknown     1,056   N N N 7.2.28 3 5   28 Unknown Unknown         NA N N 7.2.29 3 5   29 Unknown Unknown         NA N N 7.2.30 3 5   30 Unknown Unknown         NA N N 7.2.31 3 5   31 Unknown Unknown         NA N N 7.2.32 3 5   32 Unknown Unknown 12.90   1,200   Y N N 7.2.33 3 5   33 Unknown Unknown     1,950   NA N N 7.2.34 3 5   34 Unknown Unknown     1,300   NA N N 7.2.35 3 5   35 Unknown Unknown         NA N N 7.2.36 3 5   36 Unknown Unknown         NA N N 7.2.37 3 5   37 Unknown Unknown         NA N N 7.2.38 3 5   38 Unknown Unknown         NA N N 7.2.39 3 5 1999 39 Unknown Unknown     1,759   NA N N 7.2.40 3 5 2000 40 Unknown Unknown     1,247   NA N N 7.2.41 3 5 2000 41 Unknown Unknown     1,597   NA N N 7.2.42 3 5   42 Unknown Unknown     853   NA N N 8.1.1 3 5 1968 4 Unknown Unknown     1,195   Y N N 8.1.2 3 5 1973 18 Unknown Unknown     1,200   Y N N 8.1.3 3 5 1973 17 Unknown Unknown     802   N N N 8.1.4 3 5 1972 13 Unknown Unknown     788   N N N 8.1.5 3 5 1997 55 Unknown Unknown     650   NA Y N 70 Success of Geothermal Wells: A Global Study Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 8.1.6 3 5 1970 12 Unknown Unknown     952   N N N 8.1.7 3 5 1970 8 Unknown Unknown     591   N N N 8.1.8 3 5 1970 11 Unknown Unknown     950   Y N N 8.1.9 3 5 1972 14 Unknown Unknown     988   Y N N 8.1.10 3 5 1970 9 Unknown Unknown     1,424   NA N N 8.1.11 3 5 1970 10 Unknown Unknown     1,524   NA N N 8.1.12 3 5 1973 15 Unknown Unknown     943   NA N N 8.1.13 3 5 1973 16 Unknown Unknown     1,003   NA N N 8.1.14 3 5 1974 19 Unknown Unknown     860   NA N N 8.1.15 3 5 1974 20 Unknown Unknown     822   NA N N 8.1.16 3 5 1974 22 Unknown Unknown     773   NA N N 8.1.17 3 5 1974 21 Unknown Unknown     1,006   NA N N 8.1.18 3 5 1998 65 Unknown Unknown     1,459   NA Y N 8.1.19 3 5 1976 30 Unknown Unknown     1,200   NA N N 8.1.20 3 5 1977 31 Unknown Unknown     1,256   NA N N 8.1.21 3 5 1978 33 Unknown Unknown     1,415   Y N N 8.1.22 3 5 1974 23 Unknown Unknown     850   Y N N 8.1.23 3 5 1975 24 Unknown Unknown     850   Y N N 8.1.24 3 5 1975 25 Unknown Unknown     660   Y N N 8.1.25 3 5 1977 32 Unknown Unknown     924   Y N N 8.1.26 3 5 1975 26 Unknown Unknown     850   Y N N 8.1.27 3 5 1975 27 Unknown Unknown     943   NA N N 8.1.28 3 5 1975 28 Unknown Unknown     804   Y N N 8.1.29 3 5 1978 34 Unknown Unknown     800   NA N N 8.1.30 3 5 1978 36 Unknown Unknown     1,000   Y N N 8.1.31 3 5 1976 29 Unknown Unknown     1,200   Y N N 8.1.32 3 5 1979 37 Unknown Unknown     1,204   NA N N 8.1.33 3 5 1981 42 Unknown Unknown     1,508   Y N N 8.1.34 3 5 1981 43 Unknown Unknown     1,500   NA N N 8.1.35 3 5 1997 57 Unknown Unknown     1,608   NA N N 8.1.36 3 5 1997 59 Unknown Unknown     1,600   NA N N 8.1.37 3 5 1997 56 Unknown Unknown     1,601   NA N N 8.1.38 3 5 1997 58 Unknown Unknown     1,628   NA N N 8.1.39 3 5 1998 73 Unknown Unknown     1,645   NA N N 8.1.40 3 5 1998 70 Unknown Unknown     1,507   NA N N 8.1.41 3 5 1998 69 Unknown Unknown     1,552   NA N N 8.1.42 3 5 06/1999 78 Unknown Unknown     750   NA N N 8.1.43 3 5 1968 7 Unknown Unknown     985   NA N N 8.1.44 3 5 1989 44 Unknown Unknown     1,500   NA N N 8.1.45 3 5 1991 47 Unknown Unknown     1,345   NA Y N 8.1.46 3 5 1990 45 Unknown Unknown     2,556   NA N N 8.1.47 3 5 1990 46 Unknown Unknown     1,999   NA N N 8.1.48 3 5 1992 48 Unknown Unknown     2,700   NA N N 8.1.49 3 5 01/1993 49 Unknown Unknown     2,750   NA Y N 8.1.50 3 5 1993 50 Unknown Unknown     1,500   NA N N 8.1.51 3 5 1968 5 Unknown Unknown     325   NA N N 8.1.52 3 5 1968 6 Unknown Unknown     1,458   NA N N 8.1.53 3 5 1998 74 Unknown Unknown     2,330   NA N N 8.1.54 3 5   79 Unknown Unknown     2,432   NA N N 8.1.55 3 5   80 Unknown Unknown     2,495   NA N N 8.1.56 3 5 1978 35 Unknown Unknown     1,903   NA N N 8.1.57 3 5 1979 38 Unknown Unknown     2,300   NA N N 8.1.58 3 5 1980 39 Unknown Unknown     2,379   NA N N 8.1.59 3 5 1997 62 Unknown Unknown     2,157   NA N N 8.1.60 3 5 1998 67 Unknown Unknown     2,292   NA N N 8.1.61 3 5 1998 71 Unknown Unknown     2,220   NA N N 8.1.62 3 5 1981 41 Unknown Unknown     2,086   NA N N 8.1.63 3 5 1998 72 Unknown Unknown     2,220   NA N N 8.1.64 3 5 12/1998 75 Unknown Unknown     2,208   NA N N 8.1.65 3 5 1998 68 Unknown Unknown     2,342   NA N N 8.1.66 3 5 10/1994 53 Unknown Unknown     140   NA N N 8.1.67 3 5 10/1999 81 Unknown Unknown     750   NA N N 8.1.68 3 5 06/1994 52 Unknown Unknown     2,323   NA Y N 8.1.69 3 5 05/1999 77 Unknown Unknown     2,590   NA N N 8.1.70 3 5 1980 40 Unknown Unknown     2,300   NA N N 8.1.71 3 5 1995 54 Unknown Unknown     2,350   NA N N 8.1.72 3 5 1997 60 Unknown Unknown     2,500   NA N N 8.1.73 3 5 1997 61 Unknown Unknown     2,049   NA Y N 8.1.74 3 5 1998 63 Unknown Unknown     504   NA N N 8.1.75 3 5 1998 64 Unknown Unknown     614   NA N N 8.1.76 3 5 1998 66 Unknown Unknown     800   NA N N 8.1.77 3 5 1998 76 Unknown Unknown     740   NA N N 8.1.78 3 5 1994 51 Unknown Unknown     2,200   NA N N 8.1.79 3 5 1960 1 Unknown Unknown     525   NA N N 8.1.80 3 5 1960 2 Unknown Unknown     400   NA N N 8.1.81 3 5 1960 3 Unknown Unknown     552   NA N N 8.1.82 3 5   82 Unknown Unknown         NA N N 71 Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 8.2.1 3 5   1 Unknown Unknown     1,458   N N N 8.2.2 3 5   2 Unknown Unknown     2,214   N N N 8.2.3 3 5   3 Unknown Unknown     2,307   N N N 8.2.4 3 5   4 Unknown Unknown     2,396   NA N N 8.2.5 3 5   5 Unknown Unknown 9.70   1,903   Y N N 8.2.6 3 5   6 Unknown Unknown     2,300   NA N N 8.2.7 3 5   7 Unknown Unknown     2,379   NA N N 8.2.8 3 5   8 Unknown Unknown     1,993   NA N N 8.2.9 3 5   9 Unknown Unknown 3.10   2,197   Y N N 8.2.10 3 5   10 Unknown Unknown 8.60   2,133   Y N N 8.2.11 3 5   11 Unknown Unknown 9.30   2,086   Y N N 8.2.12 3 5   12 Unknown Unknown 9.90   2,194   Y N N 8.2.13 3 5   13 Unknown Unknown 5.50   2,158   Y N N 8.2.14 3 5   14 Unknown Unknown 5.10   2,246   Y N N 8.2.15 3 5   15 Unknown Unknown     2,465   NA N N 8.2.16 3 5   16 Unknown Unknown 3.90   2,300   Y N N 8.2.17 3 5   17 Unknown Unknown     2,350   NA N N 8.2.18 3 5   18 Unknown Unknown     1,343   NA Y N 8.2.19 3 5   19 Unknown Unknown     504   NA N N 8.2.20 3 5   20 Unknown Unknown     593   NA N N 8.2.21 3 5   21 Unknown Unknown     800   NA N N 8.2.22 3 5   22 Unknown Unknown     733   NA N N 8.2.23 3 5   23 Unknown Unknown     2,326   NA N N 8.2.24 3 5   24 Unknown Unknown     2,200   NA N N 9.1.1 3 5 9/12/1993 2 Not productive Abandoned     2,322 244 mm to 919 m N N N 9.1.2 3 5 6/3/1993 1 Not productive Abandoned     1,471 324 mm to 322 m N N N 9.1.3 3 5 12/6/1993 3 Not productive Abandoned     1,871 244 mm to 961 m N N N 9.1.4 3 5 2/14/1994 4 Production Production     725 244 mm to 485 m Y N N 9.1.5 3 5 6/24/1994 5 Production Production     2,339 244 mm to 1,212 m Y N N 9.1.6 3 5 12/1994 6 Production Production     1,881 219 mm to 989 m Y N N 9.1.7 3 5 6/2008 12 Production Production     2,000 340 mm to 598 m Y N N 9.1.8 3 5 3/30/1995 7 Suspended Abandoned     1,263 244 mm to 1,261 m NA N N 9.1.9 3 5 6/12/2007 8 Suspended Abandoned     156 610 mm to 48 m NA N N 9.1.10 3 5 11/20/2007 9 Production Production     1,200 244 mm to 509 m Y N N 9.1.11 3 5 1/9/2008 10 Non-commercial Abandoned     1,725 340 mm to 548 m N Y N 9.1.12 3 5 3/23/2008 11 Injector Injector     1,200 244 mm to 509 m Y N N 9.2.1 3 5 4/1970 1 Production Unknown     608 NA to 49 m Y N N 9.2.2 3 5 1/1975 2 Non-commercial Unknown     1,890 NA to 425 m NA Y N 9.2.3 3 5 6/1975 3 Production Production 4.40   490 NA to 356 m Y N N 9.2.4 3 5 9/1975 4 Production Unknown     310 NA to 282 m Y N N 9.2.5 3 5 12/1975 5 Production Unknown 1.40 1998 1,094 NA to 377 m Y Y N 9.2.6 3 5 12/1975 6 Unknown Injector     580 NA to 518 m NA N N 9.2.7 3 5 2/1976 7 Unknown Unknown     1,798 NA to 594 m NA N N 9.2.8 3 5 3/1976 8 Production Production     1,435 NA to 684 m Y Y N 9.2.9 3 5 4/1976 9 Non-commercial Unknown 1.40 1998 1,757 NA to 949 m N N N 9.2.10 3 5 5/1976 10 Production Unknown     616 NA to 232 m Y N N 9.2.11 3 5 6/1976 11 Unknown Unknown     2,105 NA to 761 m NA N N 9.2.12 3 5 9/1976 12 Production Production     1,886 NA to 915 m Y Y N 9.2.13 3 5 10/1976 13 Non-commercial Unknown 5.10   402 NA to 234 m Y N N 9.2.14 3 5 10/1976 14 Non-commercial Unknown     1,829 NA to 261 m NA Y N 9.2.15 3 5 11/1976 15 Unknown Injector     671 NA to 232 m NA N N 9.2.16 3 5 12/1976 16 Unknown Unknown     649 NA to 649 m NA N N 9.2.17 3 5 3/1977 17 Production Unknown     2,251 NA to 827 m Y N N 9.2.18 3 5 6/1977 18 Unknown Unknown 2.60 1998 328 NA to 285 m N N N 9.2.19 3 5 7/1977 19 Non-commercial Unknown     1,124 NA to 256 m NA N N 9.2.20 3 5 7/1977 20 Production Production     540 NA to 259 m Y N N 9.2.21 3 5 8/1977 21 Non-commercial Unknown 5.00   311 NA to 260 m Y N N 9.2.22 3 5 8/1977 22 Production Production     488 NA to 258 m Y N N 9.2.23 3 5 9/1977 23 Production Production 2.30 1998 376 NA to 259 m Y N N 9.2.24 3 5 10/1977 24 Non-commercial Unknown 2.50   823 NA to 260 m N N N 9.2.25 3 5 10/1977 25 Non-commercial Unknown     457 NA to 250 m NA N N 9.2.26 3 5 11/1977 26 Production Idle     457 NA to 253 m Y N N 9.2.27 3 5 12/1977 27 Production Non-commercial 2.70   640 NA to 366 m Y N N 9.2.28 3 5 1/1978 28 Unknown Production 6.30   442 NA to 368 m Y N N 9.2.29 3 5 2/1978 29 Unknown Unknown     614 NA to 341 m NA N N 9.2.30 3 5 3/1978 30 Unknown Unknown     944 NA to 481 m NA N N 9.2.31 3 5 5/1978 31 Production Production     1,852 NA to 369 m Y N N 9.2.32 3 5 7/1978 32 Unknown Unknown 6.70   582 NA to 235 m Y N N 9.2.33 3 5 8/1978 33 Unknown Unknown     934 NA to 865 m NA N N 9.2.34 3 5 9/1978 34 Unknown Unknown     34   NA N N 9.2.35 3 5 12/1982 35 Production Production     1,564 NA to 562 m Y N N 9.2.36 3 5 2/1983 37 Production Production     1,170 NA to 592 m Y N N 9.2.37 3 5 5/1983 39 Unknown Unknown     1,650 NA to 516 m NA N N 9.2.38 3 5 12/1984 40 Production Production 9.30 1989 1,295 NA to 603 m Y N N 9.2.39 3 5 4/1985 41 Unknown Unknown 4.60 1992 1,653 NA to 650 m Y N N 9.2.40 3 5 11/1985 42 Unknown Unknown     1,532 NA to 576 m NA N N 9.2.41 3 5 4/1992 43 Production Production 5.10 1992 1,139 NA to 616 m Y N N 72 Success of Geothermal Wells: A Global Study Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 9.2.42 3 5 7/1994 44 Unknown Unknown     2,019 NA to 828 m NA Y N 9.2.43 3 5 12/1995 45 Production Production 11.60 1996 1,697 NA to 684 m Y N N 9.2.44 3 5 09/1996 46 Unknown Unknown     2,138 NA to 1,510 m NA N N 9.2.45 3 5 01/1997 47 Production Production 5.10 1998 2,093 NA to 1,360 m Y N N 9.2.46 3 5 01/1997 48 Production Production 5.80 1998 2,500 NA to 1,683 m Y N N 9.2.47 3 5 12/1982 36 Unknown Idle     1,564   NA N N 9.2.48 3 5 02/1983 38 Injector Injector     1,170   NA N N 10.1.1 3 4 1993 2 Unknown Production     1,590   Y N N 10.1.2 3 4 1993 3 Unknown Production     1,500   Y N N 10.1.3 3 4 1993 4 Exploration Injector     1,500   Y N N 10.1.4 3 4 1993 5 Unknown Injector     2,080   Y N N 10.1.5 3 4 2000 14 Unknown Production     1,698   Y N N 10.1.6 3 4 2000 15 Unknown Production     1,705   Y N N 10.1.7 3 4 1993 1 Exploration Abandoned     85   N N N 10.1.8 3 4 1994 6 Non-commercial Production     213   Y N N 10.1.9 3 4   7 Not productive Unknown     167   N N N 10.1.10 3 4 1998 8 Unknown Production     168   Y N N 10.1.11 3 4 1998 9 Not productive Injector     197   N N N 10.1.12 3 4 1999 13 Production Production     243   Y Y N 10.1.13 3 4 1999 10 Unknown Abandoned     192   NA N N 10.1.14 3 4 1999 12 Production Production     200   Y N N 10.1.15 3 4 1999 11 Production Production     608   Y N N 10.2.1 3 4 1980 4 Production Production 2.50 1993     Y N N 10.2.2 3 4 1981 6 Non-commercial Production 3.50 1993     Y N N 10.2.3 3 4 1992 9 Unknown Unknown 4.50 1993     Y N N 10.2.4 3 4 1980 3 Production Production 4.80 1993     Y N N 10.2.5 3 4 1981 5 Production Production 5.70 1993     Y N N 10.2.6 3 4 1991 8 Production Production 11.00 1993     Y N N 10.2.7 3 4 1991 7 Production Production 14.00 1993     Y N N 10.2.8 3 4 1980 1 Not productive Idle         N Y N 10.2.9 3 4 1980 2 Non-commercial Injector         NA N N 11.1.1 3 5 1973 1 Non-commercial Unknown     1,003   N Y N 11.1.2 3 5 1974 2 Production Unknown 2.90   1,350   Y N N 11.1.3 3 5 1974 3 Non-commercial Unknown     1,357   N N N 11.1.4 3 5 1974 4 Non-commercial Unknown 2.10   1,661   Y N N 11.1.5 3 5 1975 5 Non-commercial Unknown     910   N N N 11.1.6 3 5 1997 97 Production Unknown 5.40   2,200   Y Y N 11.1.7 3 5 1975 6 Non-commercial Unknown 1.60   1,685   N N N 11.1.8 3 5 1978 7 Production Unknown 2.50   1,308   Y N N 11.1.9 3 5 1978 8 Idle Unknown     1,600   N N N 11.1.10 3 5 1978 9 Non-commercial Unknown     1,181   N N N 11.1.11 3 5 1979 10 Production Unknown 2.50   1,183   Y N N 11.1.12 3 5 1979 11 Production Unknown 2.40   1,221   Y N N 11.1.13 3 5 1979 12 Non-commercial Unknown 2.80   901   Y N N 11.1.14 3 5 1980 14 Production Unknown 2.20   1,049   Y N N 11.1.15 3 5 1980 15 Non-commercial Unknown 2.10   1,049   Y Y N 11.1.16 3 5 1980 16 Production Unknown 2.70   1,302   Y N N 11.1.17 3 5 1980 17 Production Unknown 3.60   1,304   Y N N 11.1.18 3 5 1980 18 Non-commercial Unknown 1.60   1,234   N N N 11.1.19 3 5 1980 13 Production Unknown 3.10   1,406   Y N N 11.1.20 3 5 1981 19 Production Unknown 2.50   2,485   Y N N 11.1.21 3 5 1981 20 Non-commercial Unknown 2.80   1,406   Y N N 11.1.22 3 5 1981 21 Non-commercial Unknown 1.60   1,348   N N N 11.1.23 3 5 1981 22 Production Unknown 2.20   1,406   Y N N 11.1.24 3 5 1982 24 Production Unknown 1.60   1,329   Y N N 11.1.25 3 5 1982 25 Non-commercial Unknown 1.00   1,620   N N N 11.1.26 3 5 1983 28 Non-commercial Unknown 1.60   1,600   N N N 11.1.27 3 5 1984 30 Production Unknown 3.30   1,607   Y N N 11.1.28 3 5 1988 44 Production Unknown 2.10   2,004   Y N N 11.1.29 3 5 1988 47 Non-commercial Unknown 1.60   1,605   N N N 11.1.30 3 5 1988 49 Production Unknown 4.70   1,599   Y N N 11.1.31 3 5 1988 50 Production Unknown 8.10   1,602   Y N N 11.1.32 3 5 1992 83 Non-commercial Unknown 1.90   2,006   N N N 11.1.33 3 5 1992 84 Production Unknown 5.00   2,005   Y N N 11.1.34 3 5 1992 85 Production Unknown 3.20   2,006   Y N N 11.1.35 3 5 1992 86 Production Unknown 3.30   2,136   Y N N 11.1.36 3 5 1982 23 Non-commercial Unknown 1.60   1,617   N N N 11.1.37 3 5 1996 94 Non-commercial Unknown     2,211   N N N 11.1.38 3 5 1983 27 Production Unknown 3.70   2,116   Y N N 11.1.39 3 5 1993 89 Production Unknown 3.00   2,200   Y N N 11.1.40 3 5 1996 93 Not tested Unknown     2,143   N N N 11.1.41 3 5 1996 95 Not tested Unknown     2,207   N N N 11.1.42 3 5 1983 26 Production Unknown 5.00   1,912   Y N N 11.1.43 3 5 1986 38 Non-commercial Unknown 1.20   2,202   N N N 11.1.44 3 5 1985 36 Abandoned Unknown     350   N N N 11.1.45 3 5 1986 37 Abandoned Unknown     1,101   N Y N 11.1.46 3 5 1989 52 Non-commercial Unknown     2,094   N N N 73 Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 11.1.47 3 5 1990 64 Non-commercial Unknown     2,099   N Y N 11.1.48 3 5 1989 54 Non-commercial Unknown 1.70   2,005   N N N 11.1.49 3 5 1989 53 Non-commercial Unknown 1.10   2,162   N N N 11.1.50 3 5 1990 63 Non-commercial Unknown 1.60   2,004   N N N 11.1.51 3 5 1994 91 Non-commercial Unknown     730   N N N 11.1.52 3 5 1997 96 Non-commercial Unknown 1.70   1,845   N Y N 11.1.53 3 5 1983 29 Non-commercial Unknown 1.60   2,504   N N N 11.1.54 3 5 1984 31 Non-commercial Unknown     1,801   N N N 11.1.55 3 5 1984 32 Dry-hole Unknown     2,590   N N N 11.1.56 3 5 1985 33 Production Unknown 4.00   1,804   Y N N 11.1.57 3 5 1985 34 Idle Unknown     1,744   N N N 11.1.58 3 5 1987 41 Non-commercial Unknown     1,886   N Y N 11.1.59 3 5 1987 39 Non-commercial Unknown 2.00   2,195   Y N N 11.1.60 3 5 1987 40 Non-commercial Unknown     2,007   N N N 11.1.61 3 5 1987 42 Production Unknown 3.00   2,006   Y N N 11.1.62 3 5 1988 43 Production Unknown 4.00   2,099   Y N N 11.1.63 3 5 1989 55 Production Unknown 3.10   1,802   Y N N 11.1.64 3 5 1989 58 Production Unknown 2.00   1,804   Y N N 11.1.65 3 5 1989 59 Production Unknown 9.00   1,898   Y N N 11.1.66 3 5 1990 62 Production Unknown 3.00   1,801   Y N N 11.1.67 3 5 1990 68 Production Unknown 2.00   1,802   Y N N 11.1.68 3 5 1990 65 Production Unknown 3.00   2,015   Y N N 11.1.69 3 5 1990 66 Production Unknown 2.00   1,800   Y N N 11.1.70 3 5 1990 67 Production Unknown 11.00   2,502   Y N N 11.1.71 3 5 1990 69 Production Unknown 4.00   2,003   Y N N 11.1.72 3 5 1990 70 Production Unknown 5.00   2,296   Y N N 11.1.73 3 5 1990 71 Non-commercial Unknown     2,101   N N N 11.1.74 3 5 1990 72 Production Unknown 2.20   1,899   Y N N 11.1.75 3 5 1990 74 Production Unknown 4.00   2,210   Y N N 11.1.76 3 5 1990 75 Production Unknown 2.00   2,177   Y N N 11.1.77 3 5 1990 61 Production Unknown 4.00   2,201   Y N N 11.1.78 3 5 1991 77 Non-commercial Unknown     2,198   N N N 11.1.79 3 5 1991 78 Non-commercial Unknown     2,205   N N N 11.1.80 3 5 1991 79 Non-commercial Unknown 2.00   2,206   Y N N 11.1.81 3 5 1991 80 Production Unknown 3.00   2,198   Y N N 11.1.82 3 5 1991 81 Production Unknown 4.00   2,207   Y N N 11.1.83 3 5 1991 82 Production Unknown 3.00   2,004   Y N N 11.1.84 3 5 1993 87 Production Unknown 5.00   2,206   Y N N 11.1.85 3 5 1993 88 Production Unknown     2,267   Y N N 11.1.86 3 5 1998 98 Non-commercial Unknown     2,010   N N N 11.1.87 3 5   99 Non-commercial Unknown         N N N 11.1.88 3 5 1998 100 Non-commercial Unknown 1.50   2,204   N N N 11.1.89 3 5 1999 101 Not tested Unknown     2,206   N N N 11.1.90 3 5 1999 102 Not tested Unknown     2,207   N N N 11.1.91 3 5 1988 45 Observation Unknown     605   N N N 11.1.92 3 5 1988 46 Observation Unknown     606   N N N 11.1.93 3 5 1988 48 Observation Unknown     602   N N N 11.1.94 3 5 1985 35 Injector Unknown     187   Y N N 11.1.95 3 5 1993 90 Injector Unknown     2,205   Y Y N 11.1.96 3 5 1994 92 Non-commercial Unknown 1.70   2,205   N N N 11.1.97 3 5 1989 51 Non-commercial Unknown 2.30   2,471   Y N N 11.1.98 3 5 1989 56 Non-commercial Unknown     2,791   N N N 11.1.99 3 5 1989 57 Non-commercial Unknown     2,299   N N N 11.1.100 3 5 1989 60 Non-commercial Unknown     2,469   N N N 11.1.101 3 5 1990 73 Non-commercial Unknown     2,223   N N N 11.1.102 3 5 1990 76 Non-commercial Unknown     2,486   N N N 12.1.1 3 4 2006 1 Not productive Unknown     1,580   N N N 12.1.2 3 4 2009 2 Production Unknown     1,030   Y Y N 12.1.3 3 4 2009 4 Marginal producer Unknown     1,013   Y N N 12.1.4 3 4 2009 3 Not tested Unknown     1,237   NA N N 12.1.5 3 4 2009 5 Marginal producer Unknown     1,897   Y N N 13.1.1 3 4 1976 1 Non-commercial Unknown         N N N 13.1.2 3 4 1976 2 Production Unknown         Y N N 13.1.3 3 4 1976 3 Production Unknown         Y N N 13.1.4 3 4 1976 4 Non-commercial Unknown         N N N 13.1.5 3 4 1976 5 Production Unknown         Y N N 13.1.6 3 4 1976 6 Non-commercial Unknown         N N N 13.1.7 3 4 1976 7 Non-commercial Unknown         N N N 13.1.8 3 4 1976 8 Production Unknown         Y N N 13.1.9 3 4 1976 9 Production Unknown         Y N N 13.1.10 3 4 1976 10 Production Unknown         Y N N 13.1.11 3 4 1976 11 Non-commercial Unknown         N N N 13.1.12 3 4 1976 12 Production Unknown         Y N N 13.1.13 3 4 1976 13 Production Unknown         Y N N 13.1.14 3 4 1976 14 Production Unknown         Y N N 13.1.15 3 4 1976 15 Non-commercial Unknown         N N N 13.2.1 3 5   1 Unknown Unknown         Y N N 74 Success of Geothermal Wells: A Global Study Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 13.2.2 3 5   2 Unknown Unknown         Y N N 13.2.3 3 5   3 Unknown Unknown         Y N N 13.2.4 3 5   4 Unknown Unknown         N N N 13.2.5 3 5   5 Unknown Unknown         N N N 13.2.6 3 5   6 Unknown Unknown         Y N N 13.2.7 3 5   7 Unknown Unknown         Y N N 13.2.8 3 5   8 Unknown Unknown         N N N 13.2.9 3 5   9 Unknown Unknown         N N N 14.1.1 3 4   1 Production Unknown     832   Y N N 14.1.2 3 4   2 Production Unknown     682   Y N N 14.1.3 3 4   3 Production Unknown     621   Y Y N 14.1.4 3 4   4 Production Unknown     679   Y Y N 14.1.5 3 4   5 Production Unknown     613   Y N N 14.1.6 3 4   6 Production Unknown     606   Y N N 14.1.7 3 4   7 Production Unknown     682   Y N N 14.1.8 3 4   8 Production Unknown     172   Y N N 14.1.9 3 4   9 Never produced Unknown     301   N N N 14.1.10 3 4   10 Never produced Unknown     972   N N N 14.1.11 3 4   11 Never produced Unknown     552   N N N 14.1.12 3 4   12 Never produced Unknown     490   N N N 14.1.13 3 4   13 Never produced Unknown     617   N N N 14.1.14 3 4   14 Never produced Unknown     606   N N N 14.1.15 3 4   15 Never produced Unknown     611   N N N 14.1.16 3 4   16 Production Unknown     487   Y N N 14.1.17 3 4   17 Production Unknown     481   Y Y N 14.1.18 3 4   18 Production Unknown     481   Y N N 14.1.19 3 4   19 Production Unknown     699   Y N N 14.1.20 3 4   20 Production Unknown     723   Y N N 14.1.21 3 4   21 Production Unknown     643   Y N N 14.1.22 3 4   22 Production Unknown     732   Y N N 14.1.23 3 4   23 Production Unknown         Y N N 14.1.24 3 4   24 Never produced Unknown     917   N N N 14.1.25 3 4   25 Production Unknown     670   Y N N 14.1.26 3 4   26 Production Unknown     827   Y N N 14.1.27 3 4   27 Production Unknown     975   Y N N 14.1.28 3 4   28 Injector Unknown     622   Y Y N 14.1.29 3 4   29 Injector Unknown     637   Y N N 14.1.30 3 4   30 Production Unknown     249   Y N N 14.1.31 3 4   31 Production Unknown     623   Y N N 14.1.32 3 4   32 Production Unknown     668   Y N N 14.1.33 3 4   33 Production Unknown     657   Y N N 14.1.34 3 4   34 Production Unknown     524   Y N N 14.1.35 3 4   35 Production Unknown     478   Y N N 14.1.36 3 4   36 Production Unknown     620   Y N N 14.1.37 3 4   37 Production Unknown     726   Y N N 14.1.38 3 4   38 Production Unknown     631   Y N N 14.1.39 3 4   39 Never produced Unknown     651   N N N 14.1.40 3 4   40 Production Unknown     697   Y N N 14.1.41 3 4   41 Production Unknown     590   Y N N 14.1.42 3 4   42 Non-commercial Unknown     604   N N N 14.1.43 3 4   43 Production Unknown     653   Y N N 14.1.44 3 4   44 Production Unknown     637   Y N N 14.1.45 3 4   45 Production Unknown     647   Y N N 14.1.46 3 4   46 Production Unknown     667   Y N N 14.1.47 3 4   47 Production Unknown     660   Y N N 14.1.48 3 4   48 Production Unknown     711   Y N N 14.1.49 3 4   49 Non-commercial Unknown     681   N N N 14.1.50 3 4   50 Production Unknown     649   Y N N 14.1.51 3 4   51 Production Unknown     650   Y N N 14.1.52 3 4   52 Production Unknown     641   Y N N 14.1.53 3 4   53 Production Unknown     630   Y Y N 14.1.54 3 4   54 Production Unknown     631   Y N N 14.1.55 3 4   55 Unknown Unknown     878   NA N N 14.1.56 3 4   56 Production Unknown     701   Y N N 14.1.57 3 4   57 Never produced Unknown     2,256   N N N 14.1.58 3 4   58 Never produced Unknown     906   N N N 14.1.59 3 4   59 Production Unknown     826   Y N N 14.1.60 3 4   60 Production Unknown     1,104   Y N N 14.1.61 3 4   61 Never produced Unknown     862   N N N 14.1.62 3 4   62 Never produced Unknown     917   Y N N 14.1.63 3 4   63 Never produced Unknown     1,229   N N N 14.1.64 3 4   64 Never produced Unknown     925   N N N 14.1.65 3 4   65 Never produced Unknown     864   N N N 14.1.66 3 4   66 Production Unknown     819   Y N N 14.1.67 3 4   67 Production Unknown     698   Y N N 14.1.68 3 4   68 Never produced Unknown     1,077   N N N 14.1.69 3 4   69 Never produced Unknown     1,174   N N N 75 Geol- Re- Order Gross Total Production Re- Well Comple- Success- Pumped ogy source of Drill- Initial Status Current Status Capacity Date Depth Casing drilled Code tion Date full (Y/N) Code Code ing (MWe) (m) (size to depth) (Y/N) 14.1.70 3 4   70 Never produced Unknown     928   N N N 14.1.71 3 4   71 Never produced Unknown     1,077   N N N 14.1.72 3 4   72 Never produced Unknown     942   N N N 14.1.73 3 4   73 Never produced Unknown     1,366   N N N 14.1.74 3 4   74 Never produced Unknown     1,260   N N N 14.1.75 3 4   75 Never produced Unknown     1,082   N N N 14.1.76 3 4   76 Never produced Unknown     1,078   N N N 14.1.77 3 4   77 Production Unknown     394   Y N N 14.1.78 3 4   78 Production Unknown     641   Y N N 14.1.79 3 4   79 Abandoned Unknown     595   N N N 14.1.80 3 4   80 Never produced Unknown     594   N N N 14.1.81 3 4   81 Unknown Unknown     435   NA N N 14.1.82 3 4   82 Production Unknown     459   Y Y N 14.1.83 3 4   83 Production Unknown     384   Y Y N 14.1.84 3 4 11/1987 84 Production Unknown     1,399   Y N N 14.1.85 3 4 1995 85 Production Unknown     343   Y N N 14.1.86 3 4 1997 86 Production Unknown     491   Y N N 14.1.87 3 4   87 Injector Unknown     1,984   Y N N 14.1.88 3 4   88 Observation Unknown     572   NA Y N 14.1.89 3 4   89 Injector Unknown     939   Y N N 14.1.90 3 4   90 Observation Unknown     1,467   NA N N 14.1.91 3 4 06/1995 91 Injector Unknown     1,554   Y N N 14.1.92 3 4   92 Abandoned Unknown     2,496   N N N 14.1.93 3 4   93 Abandoned Unknown     2,228   N N N 14.1.94 3 4   94 Injector Unknown     750   Y N N 14.1.95 3 4   95 Abandoned Unknown     1,052   N N N 14.1.96 3 4   96 Abandoned Unknown     2,240   N N N 14.2.1 3 5 1965 1 Observation Unknown     1,396   N N N 14.2.2 3 5 1966 2 Abandoned Unknown     1,034   N N N 14.2.3 3 5 1967 3 Abandoned Unknown     912   N N N 14.2.4 3 5 1967 4 Observation Unknown     1,020   N N N 14.2.5 3 5 1967 5 Observation Unknown     1,350   N N N 14.2.6 3 5 1967 6 Injector Unknown     1,082   Y N N 14.2.7 3 5 1967 8 Injector Unknown     1,119   Y N N 14.2.8 3 5 1967 7 Production Unknown     1,334   Y N N 14.2.9 3 5 1968 9 Production Unknown     1,367   Y N N 14.2.10 3 5 1968 10 Non-commercial Unknown     1,087   N N N 14.2.11 3 5 1987 44 Abandoned Unknown     760   N N N 14.2.12 3 5 1968 12 Injector Unknown     1,369   Y N N 14.2.13 3 5 1968 11 Production Unknown     1,080   Y N N 14.2.14 3 5 1968 13 Production Unknown     1,282   Y N N 14.2.15 3 5 1969 15 Redrilled Unknown         N Y N 14.2.16 3 5 1995 50 Production Unknown     2,114   Y Y N 14.2.17 3 5 1969 14 Injector Unknown     1,403   Y N N 14.2.18 3 5 1969 16 Production Unknown     1,082   Y N N 14.2.19 3 5 1970 17 Production Unknown     1,214   Y N N 14.2.20 3 5 1970 19 Abandoned Unknown     1,077   N N N 14.2.21 3 5 1970 18 Production Unknown     1,555   Y N N 14.2.22 3 5 1970 20 Abandoned Unknown     1,120   N N N 14.2.23 3 5 1970 21 Production Unknown     1,016   Y N N 14.2.24 3 5 1970 22 Abandoned Unknown     1,500   N N N 14.2.25 3 5 1970 23 Production Unknown     1,404   Y N N 14.2.26 3 5 1971 24 Production Unknown     1,256   Y N N 14.2.27 3 5 1978 32 Observation Unknown     1,518   N N N 14.2.28 3 5 1975 27 Production Unknown     1,162   Y N N 14.2.29 3 5 1974 25 Abandoned Unknown     330   N N N 14.2.30 3 5 1974 26 Injector Unknown     1,023   Y N N 14.2.31 3 5 1975 29 Injector Unknown     1,145   Y N N 14.2.32 3 5 1975 28 Production Unknown     1,252   Y N N 14.2.33 3 5 1976 30 Non-commercial Unknown     1,269   N N N 14.2.34 3 5 1976 31 Observation Unknown     358   N N N 14.2.35 3 5 1979 35 Observation Unknown     2,587   N N N 14.2.36 3 5 1978 33 Abandoned Unknown     1,374   N N N 14.2.37 3 5 1979 34 Production Unknown     1,402   Y N N 14.2.38 3 5 1980 36 Observation Unknown     1,403   N N N 14.2.39 3 5 1981 37 Non-commercial Unknown     1,554   N N N 14.2.40 3 5 1981 38 Injector Unknown     1,615   Y N N 14.2.41 3 5 1982 39 Injector Unknown     455   Y N N 14.2.42 3 5 1993 46 Injector Unknown     428   Y N N 14.2.43 3 5 1983 40 Non-commercial Unknown         N Y N 14.2.44 3 5 1995 51 Production Unknown     1,509   Y N N 14.2.45 3 5 1983 41 Production Unknown     1,546   Y N N 14.2.46 3 5 1983 42 Production Unknown     1,555   Y N N 14.2.47 3 5 1984 43 Production Unknown     961   Y N N 14.2.48 3 5 1989 45 Injector Unknown     803   Y N N 14.2.49 3 5 1995 48 Never produced Unknown     2,987   N N N 14.2.50 3 5 1995 47 Production Unknown     2,284   Y N N 14.2.51 3 5 1995 49 Production Unknown     2,798   Y N N 76 Success of Geothermal Wells: A Global Study Address: 2121 Pennsylvania Avenue, NW Washington, DC 20433 USA Tel: (202) 473-3800 Fax: (202) 974-4384 www.ifc.org 2013