Trianel Borkum II begins shaping up

Trianel Windpark Borkum II With the setting of the first steel foundation, the project partners EWE Offshore Service & Solutions and Trianel GmbH started the construction work for the Trianel Windpark Borkum II in the North Sea. 

At the WEA site BW 60, the first monopile was anchored in the seabed. By late summer, all 32 foundations, consisting of monopile and transition piece, for the municipal offshore wind farm are to be built.

"After almost three years of joint project development and intensive planning work, we have reached an important milestone with the first ramming stroke at sea," says Irina Lucke, technical managing director of
Trianel Windpark Borkum II GmbH & Co. KG. "Now we are concentrating fully on implementing the construction and logistics concept as efficiently as possible." Trianel Windpark Borkum II is to be completed and put into operation by the end of 2019.

"We bundled the experiences of EWE and Trianel and thus laid the foundation for a cost-efficient construction and economically optimized operation of the offshore wind farm," adds Klaus Horstick, Commercial Director of the joint venture. "The existing grid connection and the existing in-plant substation platform creates synergies and has a positive effect on the construction schedule."

For the installation of the foundation structures, the heavy-duty vessel Stanislav Yudin is in use on the construction site, 45km off the coast of Borkum. The monopiles weighing up to 900 tonnes and transition pieces weighing some 300 tonnes on barges will be transported by shuttle bus between Nordenham and the construction site. 

The monopiles, which are up to 73m long, are driven about 30m deep into the seabed with a hydraulic hammer and about 4,000 pile driving strokes. 

The 30m long transition piece between the foundation and the tower segments of the wind turbine, are bolted with 120 screws. The installation of the foundation structures is supplemented by the filling of the scour protection.

To protect the marine fauna, a hydro sound damper system is used to reduce the noise emissions during construction. The annular system consisting of a net with air-filled plastic balls is pulled over the monopile as a sound barrier during pile driving. As an additional shielding, the large bubble curtain is laid over a large area around the construction site.

After completion of the foundation structure, the inner-park cabling will be carried out, in which all 32 foundations will be connected to the existing internal substation platform for the two extension stages
Trianel Windpark Borkum and Trianel Windpark Borkum II. Then the tower segments, gondolas with the rotor hub and the rotor blades of the 32 wind turbines of the plant manufacturer Senvion are installed.

The
Trianel Windpark Borkum II will have an output of 200MW. Participants in the municipal offshore project are EWE AG with a share of 37.5% and a joint venture of the power utility of the city of Zurich with 24.51%. 

The Public utilities cooperation, Trianel, together with 17 municipal utilities from Germany hold a share of 37.99%. The total investment for the
Trianel Windpark Borkum II offshore wind farm amounts to around 800 million euros.

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