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Onshore Heide Hub Tennet 50Hertz50Hertz and TenneT are planning  to jointly transport wind power from the North Sea into the German power grid. The two companies have signed a cooperation to realise a multi-terminal hub in the area of Heide (Schleswig-Holstein) and an extra-high voltage direct current link (HVDC) to Mecklenburg-Vorpommern. The project is part of the 2035 grid development plan (2021) confirmed by the Fed-eral Bundesnetzagentur (BNetzA).
The partners will build the onshore multi-terminal hub for several direct current connections. It consists of a direct current switchgear. This construction enables the direct and space-saving connection of two offshore direct current connection systems, each with a capacity of two gigawatts, with an onshore direct current link. In addition, a converter is connected to this plant, which converts direct current (DC) into alternating current (AC). Between this multi-terminal hub and a converter in the area of Klein Rogahn near Schwerin, 50Hertz and TenneT plan to lay a direct-current underground cable around 200 kilometres long that will transmit electricity at the 525 kilovolt (kV) voltage level. 50Hertz will be responsible for the eastern section and TenneT for the western one.
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