Autriche

•APG-Austrian Power Grid (APG)
•VKW-Netz AG

Bosnie Herzégovine

•Nezavisni operator sustava u Bosni i Hercegovini (NOS BiH)

Belgique

•Elia System Operator SA (Elia)

Bulgarie

•Electroenergien Sistemen Operator EAD (ESO)

Suisse

•Swissgrid ag

Chypre

•Cyprus Transmission System Operator (Cyprus TSO)

République Tchèque

•CEPS a.s.

Allemagne

•EnBW Transportnetze AG ( EnBW TNG)
• TenneT TSO GmbH (TenneT TSO)
• Amprion GmbH
• 50Hertz Transmission GmbH

Danemark

•Energinet.dk

Estonie

•Elering OÜ

Espagne

•Red Eléctrica de España: S.A. (REE)

Finlande

•Fingrid OyJ

Grande Bretagne

•National Grid Electricity Transmission plc (National Grid) 
•System Operation Northern Ireland Ltd (SONI)
•Scottish and Southern Energy plc (SSE) 
•Scottish Power Transmission plc (SPTransmission)

Grèce

•Hellenic Transmission System Operator S.A. (HTSO)

Croatie

•HEP-Operator prijenosnog sustava d.o.o.(HEP-OPS)

Hongrie

•MAVIR Magyar Villamosenergia-ipari Átviteli Rendszerirányító Zártköruen Muködo Részvénytársaság (MAVIR ZRt)

Irlande

•EirGrid plc

Islande

•Landsnet hf

Italie

•Terna - Rete Elettrica Nazionale SpA (Terna)

Lithuanie

•LITGRID AB

Luxembourg

•Creos Luxembourg S.A.

Latvie

•AS Augstsprieguma tÏkls

Montenegro

•Crnogorski elektroprenosni sistem AD

Macédoine

•Macedonian Transmission System Operator AD (MEPSO)

Pays-Bas

•TenneT TSO B.V.

Norvège

•Statnett SF

Pologne

•PSE Operator S.A.

Portugal

•Rede Eléctrica Nacional, S.A (REN)

Roumanie)

•C.N. Transelectrica S.A.(Transelectrica)

Serbie

•JP Elektromreža Srbije (EMS)

Suède

•Affärsverket Svenska Kraftnät (SVENSKA KRAFTNÄT)

Slovenie

•Elektro Slovenija d.o.o. (ELES)

Slovaquie

•Slovenska elektrizacna prenosova sustava, a.s. (SEPS)