Grid connection for BorWin2 is complete

Thursday, 5 February, 2015 - 11:00
The BorWin beta converter station. (Photo:
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.

Siemens' first North Sea grid connection, the 800-MW offshore platform BorWin beta, has been turned over to the grid operator TenneT. A test operation period of several weeks was successfully completed, and at the end of January, TenneT announced that the grid connection for the wind farm cluster BorWin2 will officially be put into operation.

BorWin2 is the first offshore grid connection system in this performance class, and it is also the first system to provide the capability of connecting more than one offshore wind farm. The project is a joint investment of TenneT and the Mitsubishi Corporation. The heart of the system, the offshore platform BorWin beta, is located in the North Sea about 100 km north-west of the island Borkum in water approximately 39 m deep. The platform is 72 m long, 51 m wide, 25 m high and weighs approximately 16,000 tonnes. The platform is connected to the onshore converter in Diele, Lower Saxony, via a 200 km long DC connection.

Siemens installed the offshore platform in April 2014. "The world's first offshore grid connection with efficient DC technology has been put into commercial operation. We are proud that Siemens mastered this demanding pioneer project despite the many challenges we had to face on the high seas," said Jan Mrosik, CEO of the Energy Management Division at Siemens. BorWin2 is the first platform capable of connecting more than one offshore wind farm. Currently, the Global Tech 1 wind farm, which consists of 80 wind turbines, is connected to the platform. Half of BorWin2's capacity, however, is available for a second wind farm: Veja Mate.

BorWin2 is the first offshore grid connection system in this performance class. A total of four connections with an overall capacity of 1,400 MW have now been completed. Another eight connection systems are currently under construction, two of which - HelWin1 and SylWin1 - will also be completed during the coming weeks and months. TenneT expects at least 7,100 MW of connection capacity to be installed in the North Sea by 2019.

Tanja Peschel / Katharina Garus

Installation of the converter station BorWin beta, which was completed in May 2014 by Siemens and Prysmian on behalf of TenneT.

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