Geothermal Technologies Office, Office of Energy Efficiency and Renewable Energy Geothermal Technologies Office, U.S. Department of Energy Office of Energy Efficiency and Renewable Energy Geothermal Technologies Office, US DOE Hydrocarbons and Geothermal Office Geothermal Technologies Office, US Department of Energy Hydrocarbons and Geothermal Office Geothermal Technologies Office, United States Department of Energy Office of Energy Efficiency and Renewable Energy Geothermal Technologies Office