Transmission system operators (TSOs)
A system operator is responsible for an area to be electrically stable, and for the security of supply in his area. A system operator has to be a non-commercial organization, neutral and independent with regard to the market members.
In the Nordic countries, the system operators have the responsibility for both the security of supply and the high-voltage grid (the transmission grid). The Nordic transmission system operators (TSO) are Statnett SF (Norway), Svenska Kraftnät (Sweden), Fingrid (Finland) and Energinet.dk (Denmark). The Estonian TSO is Elering.
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