Siemens delivers technology for seventh offshore wind farm in North Sea

Siemens Energy said that it will be supplying the HVDC power transmission technology for a further offshore connection in the German North Sea.

A corresponding contract was signed by the German-Dutch network operator TenneT and the BorWin5 Offshore Consortium, consisting of Siemens Energy and Dragados Offshore.

In 2025, the platform BorWin epsilon, which is part of the BorWin5 project, will begin the low-loss transmission of electricity produced by the EnBW He Dreiht wind farm off the island of Borkum to the Garrel/Ost converter station around 230 km distant.

The transmission capacity of 900 mw is calculated to serve over 1.1 million households with electricity. The project is a further contribution toward decarbonizing Germany’s energy supply.

BorWin5 marks the seventh HVDC offshore grid connection project undertaken by Siemens Energy in Germany with TenneT.

“We are especially pleased that we can again join with TenneT to make an important contribution to the decarbonization of Germany’s energy supply. The seventh order in the German North Sea underscores the great confidence in our HVDC technology,” emphasizes Beatrix Natter, Executive Vice President of the Transmission Division at Siemens Energy. “When DolWin6 and BorWin5 begin operation, we’ll have installed a total transmission capacity for 5.6 GW of wind power in the German North Sea. This could supply around seven million German households with green electricity.”

The scope of supply for Siemens Energy and Dragados Offshore S.A. includes the turnkey construction and installation of the offshore platform in the North Sea and the on-land converter station.

The scope of supply for Siemens Energy and its Spanish partner Dragados Offshore S.A. includes the turnkey construction and installation of the offshore platform in the North Sea and the converter station on land. The offshore converter station will convert the three-phase alternating current produced by the wind turbines into direct current with a voltage of ±320kV for low-loss transmission to land.  The shore-side converter station in Garrel/Ost will then convert the electricity back into three-phase alternating current (AC) for feeding into Germany’s power grid.

Siemens Energy will supply the HVDC technology required for the project and build the shoreside station, while Dragados will be responsible for the design, procurement, construction and installation of the offshore converter platform.

 

NKT to supply cables

In an independent development, NKT announced that it has been awarded a turnkey contract by TenneT to deliver and install an HVDC XLPE power cable system for the BorWin5 project in Northern Germany. The order comprises the manufacturing ofaround 230 km of 320kV HVDC onshore and offshore power cables and accessories as well as offshore installation by the cable-laying vessel NKT Victoria. The power cables have an expected production start date of end-2021 with project commissioning in 2025.