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Second substation foundation installed at Kriegers Flak

By: Tom Russell 23/02/2018 Jan De Nul

Foundations General Substations Windfarms

The second offshore substation Gravity Based Foundation (GBF) has been installed at the Kriegers Flak offshore wind farm off the coast of Denmark.

Firstly the barge containing the 10,000 tonne GBF submerged, the heavy lift vessel Rambiz connected to the GBF through its crane hooks and towed out the structure once it started to float. An assisting tug subsequently towed the Rambiz together with the structure to its final installation location where the vessel in combination with an in-house designed ballast module set the structure down onto the seabed.

The first foundation was installed on the 19th February 2018 and weighed 8,000 tonnes. Jan De Nul's multipurpose vessel Adhémar de Saint-Venantwill now start the ballasting and scour protection works.

The two foundations consist of a steel structure on a concrete base. Jan De Nul Group was responsible for the design and construction of the concrete base, while Smulders took care of the design and construction of the steel shafts and decks placed on top.

Construction permission for the Danish part of the Kriegers Flak was granted to Vattenfall in November 2016 with a winning bid of EUR 49.9 per MWh. Financial close is expected in Q2 2018 with commissioning of the 600MW project expected in 2021.

The Danish wind farm project is located in the Baltic Sea and will consist of two parts. Kriegers Flak A, the west section, will have a total capacity of 20 MW. The east section, Kriegers Flak B, will have a total capacity of 400MW. It will feature 72 Siemens Gamesa SG 8.0-167 DD turbines which have a rotor diameter of 167m.

Each section will feature its own substation, serving both for the future Krieger Flaks offshore wind farm as well as an interconnector between the Danish and German power net funded by the European Energy Programme for Recovery.

On track to be Denmark's largest wind farm, the project will generate CO2-free electricity for approximately 600,000 households.

For more information please follow the links provided. Alternatively click here to view our interactive map.

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Second substation foundation installed at Kriegers Flak

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