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Working in consortium with the Italian cable manufacturer Prysmian, Siemens Energy is erecting HelWin 2, the link between the North Sea offshore windfarm Amrumbank West and the onshore grid. The customer is TenneT TSO GmbH of Bayreuth, Germany.

The order brings more than half a billion euros onto the consortium’s books. The grid connection, designed as a high-voltage direct-current transmission link, has a rating of 690MW and is scheduled to be operational by 2015. The centerpiece of the HelWin 2 link-up is the offshore converter platform HelWin beta, on which the Siemens HVDC Plus system for high-voltage direct-current (HVDC) transmission is installed. It also houses two power transformers and the gas-insulated high-voltage switchgear. Siemens is responsible for turnkey supply of the fully equipped floating and self-erecting platform, also known as a wind power offshore substation (WIPOS). TenneT has also awarded Siemens a contract to carry out all maintenance work on the platform and on the on shore transformer substation for an initial period of five years. This includes coordination and logistics efforts as well as performance of all necessary inspections, preventive and corrective maintenance, spare parts management, and drawing up the maintenance schedules.