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production potential of Enhanced Geothermal Systems (EGS) techniques, which involve the creation of producing geothermal reservoirs in low permeability rock units. As described by Williams and Reed (2005), Williams and others (2007), and Reed and Mariner (2007), a number of changes are being incorporated in the new resource assessment. Changes to the evaluation of identified hydrothermal systems include: (1) a minimum temperature for electric power production of approximately 90oC (75oC in Alaska), (2) a maximum depth extent for selected geothermal reservoirs of as much as 6 km, (3) a change in the preferred geothermometers used for estimating reservoir temperatures, (4) a revised method for determining recovery factors, and (5) independent evaluations of reservoir permeability using reservoir models, production histories, and chemical tracer tests. This report provides a summary of USGS techniques used to evaluate the electric power production potential of identified geothermal resources. Background Comprehensive efforts to assess the geothermal resources of the United States began after passage of The Geothermal Energy Research, Development and Demonstration Act of 1974, which assigned responsibility for the evaluation and assessment of geothermal resources to the USGS through the U.S. Department of the Interior (DOI). The USGS produced three national geothermal resource assessments in the eight years following, USGS Circular 726, Assessment of Geothermal Resources of the United States-1975 (White and Williams, 1975), USGS Circular 790, Assessment of Geothermal Resources of the United States–1978 (Muffler, 1979) and USGS Circular 892, Assessment of Low-temperature Geothermal Resources of the United States–1982 (Reed, 1983). These reports evaluated various methodologies for geothermal resource assessments and provided estimates of potential electric power generation that continue to guide long-term geothermal planning (for example, Green and Nix, 2006). The last national assessment of moderate (90 to 150oC) and high-temperature (greater than 150oC) geothermal resources, USGS Circular 790 (Muffler, 1979), estimated the potential for approximately 23,000 Megawatts-electric (MWe) of electrical power generation from identified high-temperature (>150oC) geothermal systems at depths less than 3 km in the western United States. Estimates of potential power production from undiscovered resources ranged from 72,000 to 127,000 MWe. Circular 790 listed nine western states (Alaska, Arizona, California, Hawaii, Idaho, Nevada, New Mexico, Oregon and Utah) with the potential for at least 100 MWe of electrical power generation per state from identified geothermal systems. Geothermal Resource Terminology This report follows other USGS geothermal resource studies in using the terminology adopted by Muffler and Cataldi (1978) for the subdivision of the geothermal resource base. These subdivisions are easily illustrated through a modified McKelvey 2PDF Image | Assessment of Identified Geothermal Resources
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