The Nordic regional group (formerly NORDEL) of ENTSO-E is a synchronous electrical grid composed of the electricity grids of Norway, Sweden, Finland and the eastern part of electricity sector in Denmark (Zealand with islands and Bornholm).
Gotland is not synchronized with the Swedish mainland either, as it is connected by HVDC.
[1][2] The grid also has HVDC submarine power cable links with the Baltic States.
[1] The Nordic system is connected to other synchronous areas by these links:[2]
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