This geothermal resource potential map for the United States shows locations of identified hydrothermal sites and favorability of deep enhanced geothermal systems (EGS). The map does not include shallow EGS resources located near hydrothermal sites or U.S. Geological Survey (USGS) assessment of undiscovered hydrothermal resources. The map was created by NREL using data provided by the Southern Methodist University Geothermal Laboratory and NREL analyses for regions with temperatures equal to or greater than 150°C. Source data for identified hydrothermal sites is from "USGS Assessment of Moderate- and High-Temperature Geothermal Resources of the United States." (October 2008) (Temperature-at-depth data for deep EGS in Alaska and Hawaii not available.)
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