The 576 megawatt HelWin1 High Voltage Direct Current (HVDC) converter platform foundation consists of six 3200 mm diameter foundation piles. The piles have been installed with a base frame in order to achieve the required foundation installation tolerances. Next to the platform foundation piles a Cable Access Tower has been installed by the DP3 vessel “Oleg Strashnov” of Seaway Heavy Lifting B.V.. The platform is located in the German sector of the North Sea about 40 nautical miles North East off Helgoland, Denmark.

Siemens AG has installed for TenneT Offshore GmbH the self floating topsides onto the foundation piles. The converter platform will connect the Nordsee Ost and Meerwind wind farms to the German high voltage electricity grid.