Country | Member |
| Belgium | Belgoprocess NV |
| Belgium | European Atomic Energy Community (formerly EC - JRC) |
| Belgium | SCK-CEN |
| Brasil | Eletronuclear |
| Canada | Bruce Power |
| Canada | NB Power |
| Canada | OPG |
| Czech Republic | CEZ AS |
| Finland | Fortum Power and Heat Oy |
| Finland | Teollisuuden Voima Oyj (TVO) |
| France | EDF |
| France | FRAMATOME |
| France | Orano |
| Germany | BGZ Gesellschaft für Zwischenlagerung mbH |
| Germany | GNS (Gesellschaft für Nuklear-Service mbH) |
| Germany | PreussenElektra GmbH |
| Hungary | MVM PAKS Nuclear Power Plant Ltd. |
| Hungary | PURAM (*) |
| Italy | ENEL (*) |
| Netherlands | EPZ NV |
| Netherlands | GKN (Gemeenschappelijke Kernenergiecentrale) |
| Romania | SNN (Societatea Nationala Nuclearelectrica) |
| Slovak Republic | Slovenske Elektrarne / ENEL |
| South Africa | ESKOM |
| Sweden | AB SVAFO |
| Sweden | Forsmark Kraftgrupp AB |
| Sweden | OKG Aktiebolag |
| Sweden | Ringhals AB |
| Sweden | SKB |
| Sweden | Studsvik AB |
| Sweden | Sydkraft Nuclear Power AB |
| Switzerland | Axpo Power AG |
| Switzerland | Axpo Solutions AG |
| Switzerland | CNP – c/o Alpiq AG |
| Switzerland | Kernkraftwerk Gösken-Däniken AG |
| Switzerland | Kernkraftwerk Leibstadt AG |
| Switzerland | Zwilag Zwischenlager Würenlingen AG |
| United Kingdom | EDF Energy Nuclear Generation Ltd |
| United Kingdom | Urenco Ltd. |
| United Kingdom | Westinghouse Electric UK Holdings Ltd. |
| United States | BWX Technologies, Inc |
| United States | Comanche Peak Power Cy. LLC c/o Vistra Energy Corp. |
| United States | Dominion Energy Inc. |
| United States | Energy Solutions |
| United States | Evergy Inc. |
| United States | Georgia Power (*) |
| United States | Indiana Michigan Power Company c/o American Electric Power |
| United States | Northern State Power Company - Minnesota (NSP-M) - Xcel Energy |
| United States | Omaha Public Power District |
| United States | Pacific Gas & Electric Company (PG&E) |
| United States | STP Nuclear Operating Company |
| United States | Tennessee Valley Authority (TVA) |
| United States | Union Electric Company d/b/a Ameren Missouri |
| United States | Westinghouse Electric Company LLC |