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BorWin3: Siemens hands over fifth North Sea grid connection to TenneT
With the commissioning of BorWin3, Siemens has handed over the fifth North Sea grid connection to its customer TenneT. After completion of successful test runs, the German/Dutch grid operator accepted the project. Siemens was responsible for the grid connection system including an onshore converter station. The grid connections HelWin1 and HelWin2, BorWin2, SylWin1, and BorWin3 – for which Siemens supplied all the technology for direct current transmission – are thus now in commercial operation and are transmitting power. Siemens was awarded the contract for BorWin3 in the spring of 2014. Being the fifth North Sea grid connection, it provides power to over a million German households. In July 2017 Siemens won the order for the grid connection DolWin6, which is scheduled to go into operation in 2023. A total of almost six million households will be supplied with electricity generated from wind power via these six links. 

Press Pictures

The BorWin3 converter station in Emden at night: Here, the low-loss direct current that is transmitted to shore via a 160 km long cable is converted back into alternating current. The land-based station houses two HVDC transformers, each with a rated power of 666 MVA.

The offshore platform of the grid connection BorWin3 alone can transmit up to 900 megawatts (MW) of wind energy, enough to supply over one million German households. The platform was installed in October 2018 and officially handed over to TenneT in January 2020. 

Siemens supplied the grid connection for transporting DC current to shore. BorWin3 is the fifth North Sea grid connection that Siemens has handed over to the German/Dutch transmission grid operator TenneT.

HelWin 1: Interior view of a converter station in Büttel in Schleswig-Holstein. Siemens used identical HVDC Plus Power Modules here, the same as will be used for the COBRA converter stations. 

The reactor room at the HelWin1 land-based station in Büttel, Germany, during the construction phase. Here, large reactors filter out undesirable oscillations in the wind-generated electric power. In January 2015 Siemens handed over to its customer TenneT the HelWin1 grid connection, which can supply more than 700,000 households with offshore wind power. HelWin1 is one of five North Sea grid connections that the German-Dutch transmission grid operator has contracted Siemens to build. On a large platform erected at sea off the coast of the German island of Helgoland, wind power generated offshore is transformed into low-loss direct current for transmission to land where it is converted back to conventional alternating current. 

The converter room of HelWin1 land-based station in Büttel. Here, the direct current transported to shore is transformed back into alternating current. In January 2015 Siemens handed over to its customer TenneT the HelWin1 grid connection, which can supply more than 700,000 households with offshore wind power. HelWin1 is one of five North Sea grid connections that the German-Dutch transmission grid operator has contracted Siemens to build. On a large platform erected at sea off the coast of the German island of Helgoland, wind power generated offshore is transformed into low-loss direct current for transmission to land where it is converted back to conventional alternating current. 

The converter room of HelWin1 land-based station in Büttel. Here, the direct current transported to shore is transformed back into alternating current. In January 2015 Siemens handed over to its customer TenneT the HelWin1 grid connection, which can supply more than 700,000 households with offshore wind power. HelWin1 is one of five North Sea grid connections that the German-Dutch transmission grid operator has contracted Siemens to build. On a large platform erected at sea off the coast of the German island of Helgoland, wind power generated offshore is transformed into low-loss direct current for transmission to land where it is converted back to conventional alternating current. 

The offshore platform HelWin2 alone, which has just gone online, can transmit up to 690 megawatts (MW) of green electricity, enough to supply nearly 900,000 German households. The offshore platform of the HelWin2 link is located about 85 kilometers off the northwest coast of the island of Helgoland from which it takes its name. 

Electricity from the three wind farms Butendiek, DanTysk and Sandbank is transmitted to the mainland via the SylWin1 grid connection. Siemens installed the grid connection in high-efficiency DC technology for network operator TenneT. The combined total of 232 Siemens wind turbines linked to the grid connection will provide enough electricity to supply more than one million households in the future. From the platform, there are wind turbines in view as far as the eye can see. 

Infographic

Siemens connecting roughly six million households to offshore power

Siemens is now implementing a total of six DC North Sea grid connections for TenneT. The earlier projects were HelWin1 (576 MW) and HelWin2 (690 MW) off the coast of Helgoland, BorWin2 (800 MW) and BorWin3 (900 MW) off the coast of Borkum, and SylWin1 (864 MW) off the coast of Sylt. These grid connections have been placed into service successively since 2015. DolWin6 (900 MW) is currently being executed. The grid connections equipped with Siemens technology will have a total transmission power of 4.7 gigawatts – enough to supply just under six million homes.

Facts about our five North Sea grid connections in commercial operation

Further Information

Contact

Christina Hümmer

Gas and Power

+49 (9131) 17-45722

Siemens Media Relations

Siemens AG

+49 (89) 636-36366

Link to this page
www.siemens.com/press/x-win