1 Grid utilities: Alliander, Amprion, Elia Belgium, Enagas, Enexis, Eurogrid, Fingrid, Fluvius, Italgas, National Grid, Nederlandse Gasunie, Red Electrica, Redexis, REN, RTE, Snam, Stedin, TenneT, Terna
2 Integrated utilities: Acea, A2A, Centrica, Cez, EDF, EDP, EnBW, Enel, Engie, E.on, Fortum, Hera, Iberdrola, Naturgy, Orsted, RWE, Suez/Veolia, Vattenfall, Verbund, Statkraft
