transmissionssystemoperatör

Transmissionssystemoperatör is a term used in Sweden and other Nordic and European contexts to denote the organization responsible for the operation and reliability of the national high-voltage electricity transmission network. A transmissionssystemoperatör, or transmission system operator (TSO), is tasked with maintaining safe and secure electricity supply by continuously monitoring the grid, balancing generation and consumption, and controlling power flows across the network. The operator ensures system frequency and voltage stay within limits, coordinates grid maintenance, and plans long-term investments in transmission infrastructure.

The TSO also manages system disturbances and outages, implements contingency measures, and coordinates with neighboring TSOs to ensure cross-border electricity exchange. In market terms, the operator provides and administers transmission network access for market participants, conducts capacity allocation and congestion management, and supports the electricity market through information exchange and data transparency, in accordance with European network codes and national regulations. TSOs are typically designed to be independent from electricity production and selling activities to avoid discrimination, and they are supervised by a national energy regulator. Examples in Europe include Svenska kraftnät in Sweden, Fingrid in Finland, Statnett in Norway, and Energinet in Denmark; they collaborate within ENTSO-E to coordinate interconnections and reliability across borders.