Nordic Yards has undocked the offshore platform BorWin beta

Thursday, 8 August, 2013 - 10:15
Photo: Nordic Yards

Nordic Yards has undocked the transformer platform BorWin beta. The offshore platform will now convert electricity from wind farms in the German North Sea to direct current and route it to the mainland. A few finishing tasks will be completed by the end of August, then the platform will be pulled by tug boats to its installation location 125 km off the German coast.

The topside, currently located at the quay in Warnemünde, will be installed on a foundation that has already been prepared for it in the North Sea. The legs of the platform, which are currently pointing upwards, will be guided into the foundation and secured. Subsequently, the entire platform will rise out of the water on its own legs and will then stand 20 m above the water level. A station for high-voltage direct current (HVDC) that can handle up to 800 MW is installed on the platform.

When BorWin beta is undocked, SylWin alpha will be visible, which is the third platform under construction at Nordic Yards. The topside alone is the size of an 11-story building and is being assembled on a special substructure in the dock. Construction of the fourth transformer platform, DolWin gamma, will begin next year.

Katharina Garus

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The SylWin1 platform (864 MW), which measures 83 x 56 x 26 m (L x W x H), is the world's largest installed converter platform. It will transmit the energy produced by the three North Sea wind farms Dan Tysk, Butendiek and Sandbar ashore.

Just a few days ago, Siemens had announced that the HVDC converter platform HelWin beta has been completed. Its next offshore platform in the North Sea is now also ready. SylWin alpha is the largest HVDC platform that has ever been installed in the North Sea.

Nordic Yards has begun construction work on the offshore converter station DolWin gamma at the shipyard in Warnemünde. (Photo: Nordic Yards)

Construction work on the offshore transformer platform DolWin gamma began on 9 October at Nordic Yards in Warnemünde. Representatives of the contractor Alstom as well as the end-customer TenneT looked on as the traditional first steel cut took place in Warnemünde.

A combination of three Dutch offshore companies realized a unique operation in the North Sea, installing a giant ‘power socket’, the SylWin alpha platform. Siemens commissioned Seaway Heavy Lifting to perform an unusual operation that in turn called in the assistance of maritime service provider Dockwise and engineered heavy lifting and transport specialist Mammoet.

The BorWin beta converter station. (Photo:

After several weeks of test operation, TenneT has now approved the offshore platform BorWin beta delivered by Siemens. The grid connection for the BorWin2 cluster can now begin commercial operation.