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Siemens has installed the HelWin1 offshore platform in the North Sea, which will link the 295 MW Nordsee Ost and 288 MW Meerwind offshore wind farms to the German mainland.

Using the Siemens technology installed on the platform, the alternating current (AC) power generated by the wind turbines will be transformed into direct current for transmission onto land. The land-based station, also supplied by Siemens to TenneT, is located northwest of Hamburg in Büttel, where electricity will be converted back into the AC power required for feeding into the grid.

"With the installation of our platform at sea, we have successfully mastered the most critical part of this project and are now in the final stretch for commissioning in 2014," says Siemens’ Karlheinz Springer.

The network operator TenneT contracted the consortium consisting of Siemens and the Italian cable company Prysmian for the HelWin1 offshore grid connection in 2010. This consortium is implementing a total of four North Sea grid connection projects for TenneT: HelWin1 and HelWin2 off of Helgoland, BorWin2 off of Borkum, and SylWin1 off of Sylt.

After seven days of transport at sea and four days of installation on site, the HelWin1 platform was anchored at its final position northwest of the island of Helgoland on Aug. 23. Siemens had installed the platform's support substructure at this location in June in the 23-meter-deep North Sea. Now, the two subsea cables from Prysmian are also to be connected.






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