Netherlands-based transmission system operator TenneT has selected an international consortium to build sea and land converter stations for the 235km-long BorWin6 offshore grid connection system.

The consortium comprises McDermott, Global Energy Interconnection Research Institute (GEIRI) and C-EPRI Electric Power Engineering (C-EPRI).

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BorWin6 is a grid connection system of offshore wind farms with a total transmission capacity of 980MW. It is expected to be commissioned in 2027.

Under the terms agreed, McDermott will be responsible for building converter stations, while GEIRI and C-EPRI will carry out the electrical engineering works for the project.

TenneT is expected to award the contract for a second lot of works, which will involve the production and laying of cables, by the end of this year.

TenneT chief operations officer Tim Meyerjürgens said: “With regard to the high expansion targets for offshore wind energy in the North Sea, we are pleased that an international consortium was able to prevail in our tendering procedure.

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“As a transmission system operator, we will need many reliable partners in the coming years to enable the offshore expansion at the desired pace and with the targeted connection capacities.

“In terms of speeding up the process, we have taken the lead with this project: it was initially planned with a connection capacity of 930MW.

“In the technical planning, we were able to increase the capacity by 50MW. The project was recently confirmed in the latest grid development plan.”

BorWin6 will be the last project implemented by TenneT in the German North Sea using its 320kV technology. Future projects will switch to 525kV technology, with a transmission capacity of 2GW.

Last year, TenneT announced a wind power ‘booster’ concept to help Germany reach its offshore grid expansion targets sooner.

The company plans to combine three 2GW network systems to expand the country’s offshore grid for wind energy in the North Sea.