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Home/Grid/Grid developement/Concluded projects/Kontek 400-KV Grid Connection

Kontek 400-KV Grid Connection

Underground cable replacement of the KONTEK cross-border 400-kV grid connection

The KONTEK 400-kV grid connection, KONTEK for short, is a direct current connection between the German and Danish power grid. The name KONTEK comes from the word “continent” (“Kontinent” in German) and the name of the Danish grid operator Elkraft (now Energinet), which used to be abbreviated as ‘ek’ and operates the power grid on the Danish islands of Lolland, Falster and Seeland. 50Hertz is responsible for KONTEK on the German side. This high voltage direct current (HVDC) transmission line is operated at 400 kilovolts (kV) and transmits 600 megawatts (MW). KONTEK is about 170 kilometres long and was put into operation in 1995. The HVDC cable runs through a so-called point-to-point connection via underground and submarine cable, directly between the converter or transformer stations of both countries. This direct connection transports the energy with fewer losses and is therefore more efficient for everyone.

25 years later, the cables had reached the end of their operability.  The 150-km long onshore and submarine cable section, for which Energinet is responsible, was replaced first. The underground onshore cable over a further distance of around 15 km in Mecklenburg-Western Pomerania was replaced by 50Hertz during the second stage. After the new route has been commissioned, the old line will be disassembled.

After the conclusion of the work activities, KONTEK has been operational again since mid-2023.

CONTACT

Tobias Frank

Offshore Projects
  • Tel:
    +49 (0)30 5150 3293
  • E-Mail:
    tobias.frank@50hertz.com

Status

The KONTEK 400-kV grid connection is a so-called interconnector. An interconnector is an international connection that connects the transmission system of Germany with the transmission system of other countries. For KONTEK, this is the Danish transmission system.

Line route

The course of the entire route between Germany and Denmark covers a distance of about 170 kilometres via underground and submarine cable (see overview map).

Overview map

50Hertz is planning to install the KONTEK underground cable in parallel to the existing route. This means that the existing route and the new route will run almost exactly next to each other. The current route planning should use the buffer strip of the existing cable as much as possible.

From the landfall at Markgrafenheide, the cable route runs some 15 kilometres over land up to the Bentwisch substation. The course of the line is determined by the conservation areas and existing underground infrastructure. That is why the course of cable routes is usually constituted of straight sections between turning points.

Technology and construction method

The large distance between Germany and Denmark is continued to be bridged by means of a high voltage direct current (HVDC) cable, as it has been since the mid-1990s. The HVDC cable runs through a so-called point-to-point connection via an underground and submarine cable, directly between the converter or transformer stations of both countries. This direct connection transports the energy with fewer losses and is therefore more efficient for everyone.

Information and materials

Detailed information on the course of the project and other materials are available on the following page.

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