ALPIQ ENERGIA ITALIA S.P.A.
BEGAS ENERGY INTERNATIONAL S.P.A.
BP GAS MARKETING LIMITED (ex BP ENERGY EUROPE LIMITED)
ELETTROGAS S.P.A. A SOCIO UNICO
ENERGEAN ITALY SPA (EX EDISON EXPLORATION & PRODUCTION SPA)
ERG POWER GENERATION SPA (ex ERG S.P.A.)
GAS NATURAL VENDITA ITALIA S.P.A.
GDF SUEZ ENERGIA ITALIA S.P.A.
RWE SUPPLY & TRADING GMBH
SHELL ENERGY ITALIA SRL (ex SHELL ITALIA SPA)
SOCIETÀ ADRIATICA IDROCARBURI S.P.A.
SONATRACH GAS ITALIA S.P.A.