BOTAS Petroleum Pipeline Corporation - Delta - Egyptian Natural Gas Holding Company - Eni Gas and Power - Essent N.V. - Gasunie - Gaz de France - Gazprom - Geoplin - Latvijas Gaze - MOL Gas Transmission Company - Moldovagaz - Naftogaz of Ukraine - National Grid - ÖMV Gas GmbH - PGNiG - Plinacro - Romgaz - Shell Energy Europe - Sonatrach - SPP - Srbijagas - Statoilhydro - STEG - Swissgas - Wintershall