The Kontek HVDC is a 170-kilometre (110 mi) long, monopolar 400 kV high-voltage direct current cable between Germany and the Danish island Zealand.

This unusual measure, which raised the construction costs of Kontek significantly, was made for practical rather than technical reasons.

Obtaining permission for building overhead lines can take a long time, and hence underground cables were used in order to ensure it was completed on schedule.

The Kontek reaches Falster near Gedser, and crosses the island via 50 kilometres (31 mi) of underground cable.

A supplemental 400 MW AC connection between Germany and Zealand in 2018 and costing DKK 2.9 billion, is planned to use the Kriegers Flak offshore wind farm, enabling the wind power to be transmitted to either country as well as passing power between the countries.