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BorWin3 ready for action

By: Tom Russell 12/08/2019 TenneT

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Dutch-German transmission system operator TenneT has commissioned the BorWin Gamma platform, which forms part of the BorWin3 grid offshore grid connection project. The 900 MW project will convert three-phase electric power generated by offshore wind farms into direct current and transmit it 160km back to shore.

The 18,000 tonne topside was installed in October 2018, using a "float-over-process". This meant that during installation the platform was pulled over the jacket foundation and was positioned precisely. It was then ballasted using water to lower the structure onto the foundation.

Petrofac and Siemens, in consortium, were awarded the main contract for the offshore grid connection project contract by TenneT in 2014. The jacket foundation was fabricated by Heerema Fabrication Group and was installed in May 2018.

In total, a distance of 160 kilometres is being bridged, whereby the wind power is first transported over a 130 kilometre long submarine cable to the west of Borkum to Hamswehrum. From there, over a 30 kilometre long underground cable to Emden/East. One of the projects to use the connections is the Hohe See project, which is currently under construction.

BorWin3 is the third project to be realigned by TenneT in DC technology off the coast of Borkum, alongside the BorWin1 and BorWin2 grid connection projects.

Over the next ten years, TenneT expects to invest EUR 35 billion in offshore and onshore grid connections across the Netherlands and Germany. Approximately 80% of TenneT's investments are related to renewables, such as wind and solar energy. In the period up to 2030, TenneT expects to have realized approximately 25 GW of connection capacity for offshore wind farms in the Dutch and German parts of the North Sea, transmitting enough electricity to power 31 million households annually.

TenneT CEO Tim Meyerjürgens. "According to all international studies and scenarios, the current rate of development in Europe is not enough for offshore wind to reach the goals of the Paris Climate Agreement for Europe. Accelerated, large-scale and internationally coordinated expansion is needed. In this context, TenneT has just presented a feasibility study by the North Sea Wind Power Hub consortium on the implementation of wind energy distribution boxes in the North Sea.

"An internationally coordinated approach in the future could implement the integration and connection of a large expansion of offshore wind energy more effectively and with significantly lower costs of up to 30 percent than with a continued individual national planning."

For more information on offshore wind developments, click here.

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BorWin3 ready for action

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