Cable laying works for Nordsee One completed

Monday, 12 September, 2016 - 10:30
The 59 inter-array cables for offshore wind farm Nordsee One have been installed successfully with the help of the vessels Siem Aimery (shown on the left) and Siem Moxie (on the right). (Photo: SIEM Offshore Contractors GmbH)
The 59 inter-array cables for offshore wind farm Nordsee One have been installed successfully with the help of the vessels Siem Aimery (shown on the left) and Siem Moxie (on the right). (Photo: SIEM Offshore Contractors GmbH)

Three weeks ahead of schedule, the inter-array cables for offshore wind farm Nordsee One have been installed by SIEM Offshore Contractors GmbH. The foundations and the offshore substation for the 54 wind turbines have also already been installed.

In total, 59 inter-array cables will connect the wind farm’s wind turbines to the offshore substation. They are configured in ten strings of cables with an overall length of approximately 70 km. This is a greater distance than the length of the Eurotunnel connecting the UK with Continental Europe.

SIEM Offshore Contractors supplied, installed, terminated and tested the submarine cables and associated accessories for Nordsee One wind farm.

The cables have a diameter of up to 160 mm and a weight of up to 36 kg/m. During the installation and operational phase of the project, a layer of steel armor wires protects the high-performance electricity conductors and fiber-optics. The cables were laid and buried using the new purpose-built cable installation vessel, the Siem Aimery. The vessel was supported by the Siem Moxie, which facilitated the transfer of personnel to the structures via a walk-to-work-system.

“Looking ahead, in the upcoming weeks the export cables will be installed by the grid operator. We will then commission all of the electrical systems in preparation for the connection of the wind turbines, which we plan to begin installing in early 2017, when the weather conditions allow,” said Pierre Lestienne, Managing Director (CFO) of Nordsee One GmbH.

Once completed, Nordsee One wind farm will consist of 54 wind turbines with an overall installed capacity of 332 MW. The wind farm is owned by Northland Power Inc. (85%) and Innogy SE (15%), a subsidiary of RWE.

Tanja Peschel / Nordsee One GmbH

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