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Electric power companies
 : E.ON - RWE
.svg/22px-Flag_of_Belgium_(civil).svg.png) : Electrabel
 : Hydro-Québec
 : Compagnie nationale du Rhône - EDF - SHEM - SNET
 : Endesa - Iberdrola - Union Fenosa
 : Enel
 : WAPDA
 : Electricidade de Portugal
 : Axpo - BKW - EGL - NOK
Nuclear power companies
 : Siemens
 : Areva - Areva NC - Areva NP
 : Westinghouse
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Oil companies
 : Sonatrach - Sonelgaz
 : Saudi Aramco
 : CNRL - EnCana - Husky Energy - Imperial Oil - Irving Oil - Nexen - Petro-Canada - Suncor - Syncrude
 : Petrobras
 : Chinese national off-shore oil company - PetroChina
: Pakistan State Oil
 : Repsol YPF
: Chevron Corporation - ConocoPhillips - Exxon Mobil - Standard Oil - Texaco - Unocal
: Gaz de France - Total S.A.
 : BP - Shell
 : Ente nazionale idrocarburi
 : Gazprom
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Renewable energy companies
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