Definition
A TSO (Transmission System Operator) is the national system operator for the transmission system - that is, the high-voltage grid that carries power over long distances between regions and countries. The TSO is responsible for ensuring that generation and consumption are in balance second by second, coordinates cross-border power trading and operates the nation's ElhubNational hub for metering data and market processes in the Norwegian electricity market. or equivalent data hub. In Norway, StatnettNorway's system operator for the transmission grid - owns and operates the high-voltage network and operates Elhub. is the sole TSO. In the EU, TSOs are regulated by ACEREU's energy regulator - coordinates national regulators and sets common rules for the power market. and the national regulatory authorities (in Norway's case, RMENorwegian Energy Regulatory Authority - government authority that regulates grid operations and energy markets.). TSOs collaborate through ENTSO-EEuropean Network of Transmission System Operators for Electricity - collaborative body for European TSOs coordinating joint grid operations and regulations. to harmonise rules and operations of the European power system.