Aare-Tessin für Elektrizität (Switzerland) Allegheny Arizona Electric Arizona Electric Associated Electric Cooperative all over Austria Baltimore Gas & Electric BKW Energie (Switzerland) Brazos Electric Central and Southwest Services (CSW) Centralschweizerische Kraftwerke (Switzerland) CFE (Mexico) Chugach Electric City of San Antonio CONVEX Dairyland Power Dlemarva Electric Elektrizitäts-Gesellschaft Laufenburg (Switzerland) Elektrizitätswerk der Stadt Zürich (Switzerland) ERCOT and nine member utilities EVS (Germany) GPU Hong Kong Electric Hydro Quebec MAIN Mid-America Power Pool (MAPP) Max Control Systems

New York Power Association Nordostschweizerische Kraftwerke (Switzerland) Northern States Power (DMS) NEPEX NERC (Inter-Regional Security Network (ISN) interconnecting 22 security nodes all over USA New York Power Pool (NYPP) Northern States Power (EMS) Northern States Power (Substation) Oglethorpe Electric Ohio Edison Pacific Gas & Electric PEPCO Poland Powergrid India (national power grid for the entire country) Power Pool of Alberta (PPoA) PJM and ten member utilities Rochester Gas and Electric Southern Southern California Edison (SCE) Southwest Power Pool (SPP) S.A. I’Energie de I’Quest-Suisse (Switzerland) Texas Utilities VACAR VEW Energie (Germany) Western Area Power Pool (WAPA) ...