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Offshore Wind Journal

Offshore Wind Journal

Hohe See deal sees Siemens assume responsibility for turbines and foundations

Fri 17 Feb 2017 by David Foxwell

Hohe See deal sees Siemens assume responsibility for turbines and foundations
Siemens’ contract for Hohe See sees it responsible for the turbines and foundations for the windfarm, working with installation contractor GeoSea

Siemens Wind Power has been awarded a contract to provide ‘a complete solution’ for the offshore element of EnBW’s Hohe See offshore windfarm.

Having reached the final investment decision for the 497 megawatt (MW) Hohe See offshore windfarm, owner EnBW has awarded a contract to Siemens that will see the turbine manufacturer made responsible for the turbines and project-specific foundations for it.

The contract is also noteworthy because it sees Siemens’ new blade manufacturing facility in the UK receive its first export order.

Installation work is due to get under way in early 2018 on the Hohe See project, which is 90km north of the German island Borkum in the North Sea in water depths of up to 40m.

Siemens has been contracted to provide 71 SWT-7.0-154 turbines, each of 7MW, for the project. It will manufacture them at its new nacelle plant in Cuxhaven from mid-2018 onwards. The blades will be shipped from factories in Hull in the UK and Aalborg in Denmark. The windfarm is due to be commissioned in the third quarter of 2019.

Since 2016 Siemens has been working on project-specific solutions for the foundations for Hohe See. The result was the development of a large monopile design with a length of up to 80m, weighing up to 1,500 tonnes. Siemens is partnering with installation company GeoSea, part of DEME, who will install the monopiles and transition pieces.

Siemens says the nature of the contract will reduce risk significantly using an integrated design and installation approach together with Siemens responsible for the complete turbine/transition piece/foundations solution.

“We are happy to apply our full scope of engineering services at Hohe See,” said Siemens Wind Power offshore chief executive Michael Hannibal. “The extended scope of this contract makes this 497MW windfarm one of the largest projects that we have ever executed.”

After commissioning, Siemens will provide service and maintenance for a period of at least five years. Grid connection will be established via the BorWin 3 high-voltage DC link and BorWin Gamma converter platform, which will be installed by Siemens for grid operator Tennet.

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