Energinet.dk’s electricity transmission grid is connected to the neighbouring areas in Norway, Sweden and Germany.
The East Danish power system is synchronised with the Nordic system, whereas the West Danish power system is synchronised with the continental European system.
International connections from Eastern Denmark
The interconnection to Sweden consists of four AC connections – two 400 kV cable connections (one established in 1973 and the other in 1985) and two 132 kV cable connections (established in the period 1951-1964) – with a total thermal capacity of about 1900 MW. The interconnection to Sweden is also a link to the Nordic grid.
The interconnection to Germany, Kontek, is a 400 kV DC connection with a transmission capacity of 600 MW. The interconnection was established in 1995 in collaboration with VEAG, Germany. Energinet.dk owns the Danish AC/DC converter station near Køge and the DC cable until the German coastline.
International connections from Western Denmark
The interconnection to Sweden, KontiSkan, consists of two 250 kV DC connections with a total transmission capacity of 740 MW. The two connections were established in 1965 and 1988, respectively. In 2006, substation equipment relating to the oldest interconnection was replaced, which increased the total transmission capacity by 110 MW.
The interconnection to Norway, Skagerrak, consists of three DC connections with a total transmission capacity of 1040 MW. The first two interconnectors of 250 kV and 270 MW were established in 1972-75, and the latest interconnector of 350 kV and 500 MW was established in 1992.
The interconnection to Germany consists of four AC connections. The 400 kV connection, which starts in Kassø, was established in 1978. Two 220 kV connections, which start in Kassø and at Ensted Power Station, were established in 1965 and 1961, respectively. Finally, there is a 150 kV connection from Ensted Power Station.
The total transmission capacity is determined by congestion in the surrounding grids and is normally 1500 MW in the southbound direction and approximately 950 MW in the northbound direction.