TenneT takes delivery of HelWin1, BorWin2

February 10, 2015

The Prysmian Group and Siemens consortia completed and delivered the BorWin2 and HelWin1 projects to TenneT in the North Sea.

Prysmian Group Cableship Giulio Verne operating by the HelWin converters platforms. From Prysmian.
 

BorWin2 and HelWin1 are high voltage direct current (HVDC) offshore grid connection projects off the coast of Germany.

Commercial operations have since commenced at the project.

BorWin2 now links the Global Tech 1 offshore wind farm in the North Sea to mainland Germany and has the same grid connection capacity available for further offshore wind farm connections. This project marks a series of significant milestones, being the first large-category offshore grid connection worldwide to take up commercial operation with HVDC technology, employing an extruded cable connection along a 200km route (125km offshore and 75km onshore) with the highest power transmission capacity (800 Mw) and the highest DC voltage level (± 300 kV DC) worldwide, a record previously also held by Prysmian with the ±200 kV DC Transbay Project in San Francisco, California.

HelWin1 is the second HVDC grid connection to be handed over to TenneT in the first weeks of this year and links the offshore wind farms Nord See Ost and MeerWind to mainland Germany with a ± 250 kV DC, 576 MW cable connection along a total route of 130km (85km submarine and 45km land).

Both BorWin2 and HelWin1 use extruded HVDC cable technology from Prysmian together with Siemens HVDC Plus converter technology at the offshore platform and onshore stations. Prysmian Group has also installed the multiple 155 kV HVAC submarine cableswhich connect the converter platforms to the respective individual offshore wind farm transformer platforms.

TenneT contracted the consortium consisting of Siemens and the Italian cable specialist Prysmian for the HelWin1 offshore grid connection in summer 2010.

Siemens is now implementing three additional North Sea grid connection projects for TenneT: HelWin2 (690 MW) off of Helgoland, BorWin3 (900 MW) off of Borkum and SylWin1 (864 MW) off of Sylt.

The next two grid connections, Sylwin1 and HelWin2, are scheduled to take up commercial operation in the first half of 2015 as well. Siemens received its latest order for a grid connection in the North Sea, BorWin3, in a consortium with Petrofac in the spring of 2014. Commissioning of this fifth grid connection from Siemens is scheduled for 2019. The grid connections implemented by Siemens for TenneT will have a total transmission capacity of theoretically more than 3.8 Gw, providing electricity from offshore wind power to supply around 5 million households.



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