A Transmission System Operator (TSO) is an entity entrusted at a national or regional level with the transport of energy in the form of natural gas or electricity over a fixed infrastructure.
| Name | Commodities | Country | |
|---|---|---|---|
| 50Hertz Transmission GmbH | Power | DE | |
| Amber Grid AB | Natural Gas / Natural Gas (GBP) | LT | |
| Amprion GmbH | Power | DE | |
| Augstsprieguma tîkls AS (AST) | Power | LV | |
| Austrian Power Grid AG (APG) | Power | AT | |
| Borzen, operater trga z elektriko, d. o. o. | Power | SI | |
| Central European Gas Hub AG | Natural Gas / Natural Gas (GBP) | AT | |
| Conexus Baltic Grid A S | Natural Gas / Natural Gas (GBP) | LV | |
| Eirgrid plc. | Power | IE | |
| Elektromreža Srbije | Power | RS | |
| Elering AS | Power | EE | |
| Elering AS Oy | Natural Gas / Natural Gas (GBP) | EE | |
| ELES, d.o.o. | Power | SI | |
| ELEXON | Power | UK | |
| Elia System Operator SA | Power | BE | |
| Enagás S.A | Natural Gas / Natural Gas (GBP) | ES | |
| Energinet.dk | Power, Natural Gas | DK | |
| eSett Oy | Power | FI | |
| Fingrid Oyj | Power | FI | |
| Fluxys | Natural Gas / Natural Gas (GBP) | BE | |
| Gas Transport Services B.V. | Natural Gas / Natural Gas (GBP) | NL | |
| Gasgrid Finland Oy | Natural Gas / Natural Gas (GBP) | FI | |
| Litgrid AB | Power | LT | |
| MAVIR Magyar | Power | HU | |
| National Grid | Natural Gas / Natural Gas (GBP) | UK | |
| Natran | Natural Gas / Natural Gas (GBP) | FR | |
| OTE, a.s. | Power, Natural Gas | CZ | |
| Polskie Sieci Elektroenergetyczne SA | Power | PL | |
| Réseau de transport d'électricité (RTE) | Power | FR | |
| Snam Rete Gas S.p.A. | Natural Gas / Natural Gas (GBP) | IT | |
| SONI Ltd. | Power | UK | |
| Statnett SF | Power | NO | |
| Svenska Kraftnät | Power | SE | |
| Swissgrid AG | Power | CH | |
| TenneT TSO B.V. | Power | NL | |
| TenneT TSO GmbH | Power | DE | |
| Trading Hub Europe GmbH | Natural Gas / Natural Gas (GBP) | DE | |
| TransnetBW GmbH | Power | DE |