Akita Geothermal Energy Co
Alstom
Alternative Earth Resources, Inc.
Amedee Geothermal Venture
Ansaldo Energia
Beowawe Power LLC
Berkshire Hathaway
Bflat
Biliran Geothermal Incorporated
BM Enerji
BM Holdings
Bottle Rock Power PLC
BPPT
CalEnergy Generation
Calpine Corporation
CELIKLER
CFG Services
Chena Hot Springs
Chevron Energy
Chevron Geothermal India
Chevron Geothermal Philippines Holdings
Chuo Electric Power Co
Compania Federal de Electricidad
Constellation Energy
Contact Energy
Corbetti Geothermal
Coso Operating Co.
Costa Rican Electricity Institute (ICE)
Daldrup & Sohne AG
ElectraTherm, Inc.
Electric Power Development Co
Electric Power Tibet
Électricité de France Développement Environnement
Emerging Power Incorporated (EPI)
Empresa de Generacion de Energia Electrica del INDE
Empresa Nicaraguense de Electricidad (ENEL)
Empresa Transmisora de El Salvador (ETESAL)
ENAP
ENDA Enerji
Endesa Chile
Enel Green Power
Enel North America
Energy Development Corporation
Enex
Ergon Energy
Ethiopian Electric Power Corporation
European EGS Interest Group
Fuji Electric Co. Ltd.
General Electric
Geodipa
Geodynamics
Geonext Corporation
Geothermal Development Company
Global Geothermal Limited
Gradient Resources
Green Energy
Güris Holding
Halliburton
Hitachi Ltd
HL Power Company
Hokkaido Electric Power Co.
Home Stretch Geothermal
Hudson Ranch Energy Services
Iceland Drilling company
Idemitsu Kosan Co., Ltd.
Idemitsu Oita Geothermal
Instituto Costaricense de Electricidad
Japex Geothermal Kyushu Co
JV PetroEnergy
Kamchatskburgeotermiya
KenGen
Kokushokankokai
Kujyu Kanko Hotel
Kyushu Electric Power
LaGeo SA de CV
Landsvirkjun
Lihir Gold
Lt. Scandinavia Corporation
Magma Energy (US) Corp
Maibarara Geothermal Inc.
Maren Enerji
McGinness Hills
Menderes A.S.
Menderes Geothermal
Mighty River Power
Mitsubishi Heavy Industries Limited (MHI)
Mitsubishi Materials Co
National Power Company of Iceland
Nitetsu Kagoshima Geothermal Co
Northern California Power Agency
Orchid Business Group
Oriental Mindoro Electric Cooperative (Ormeco)
Orkuveita Reykjavikur
Ormat
Ormat Technologies Inc
Orpower Twenty Two
Oserian Development Company
PacificCorp Energy
PLN
PLTP
PNOC Renewables
PT Dizamatra Powerindo
PT Pertamina
PT Pertamina Geothermal Energy
PT PLN (Persero)
PT. Geo Dipa Energy
PT Rekayasa Industri
Ram Power Company
Raser Technologies
Reykjavik Emera Inc
Reykjavik Energy
Reykjavik Geothermal
Rican Electricity
SC Geoterm
Sejahtera Alam Energy
Sosian Energy
Southern California Edison
Stadtwerke Muenchen
Star Energy Ltd
Suginoi Hotel
Sumitomo Corporation
Surprise Valley Electric Corp.
Technologies, Inc.
Terra-Gen LLC
Tohoku Electric Power Co. Group
Tohoku Electric Power Co., Inc.
Tohoku Hydropower
Tokyo Electric Power
Top Energy
Toshiba Corporation
Tuaropaki Power Company
Turcas BM Kuyucak Jeotermal Elektrik
Turcas Energy Holding
U.S. Geothermal Inc.
Viridity Energy
Wasabi
Wayang Windu
Yuzawa Geothermal Power Corp
Zorlu Energy Group