It could transfer 20 megawatts over a 98-kilometer-long submarine cable between Västervik on the mainland and Ygne on the island of Gotland, with a voltage of 100 kV.

The Swedish company ASEA manufactured the connection for Vattenfall, the state-owned energy provider.

In 1970 the service was re-engineered to transmission capacity of 30 megawatts at a voltage of 150 kV by using the first thyristor module for HVDC applications.

Beside this, HVDC Gotland 2 has a 6.6 kilometres long overhead powerline section between Västervik static inverter plant and the Swedish Coast.

It consists of a 12 kilometres long overhead line on wooden poles, which uses 2 Aluminium conductors each with 910 mm2 cross section and a 0.75 kilometres long underground cable consisting of 2 Aluminium conductors each with 1000 mm2 cross section.