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Kriegers Flak turbine installation reaches halfway mark

By: Tom Russell 08/04/2021 Jan De Nul

General Windfarms

Jan De Nul has announced that it has reached the halfway mark for the Kriegers Flak offshore wind farm. Of the project's 72 Siemens Gamesa SG 8.0-167 DD wind turbines, 36 remained to be installed at the time of the announcement.

On 27 January, Jan De Nul, Siemens Gamesa and Vattenfall successfully installed the very first wind turbine for the Kriegers Flak offshore wind farm. The last turbine is scheduled to be installed in mid-June, approximately 4.5 months after the start of this installation campaign.

This offshore wind farm will become the largest in Denmark and will increase Denmark's offshore wind production by no less than 16 percent.

Bert Reynvoet, Project Manager of Jan De Nul Group for the Kriegers Flak offshore wind farm, said: "We are proud that we can tick off this milestone nicely on schedule. All 72 wind turbines must be installed within a period of 4.5 months. Our customer's wishes are paramount and despite the challenging winter weather conditions in the Baltic Sea, COVID-19 and challenging soil conditions for our jack-up installation vessel, we have managed until today to strictly adhere to the installation schedule. Thanks to the commitment, flexibility and professionalism of our co-workers!”

For the first time since its expansion in 2018, the port of Roenne on the Danish island of Bornholm is serving as marshalling harbour for the construction of an offshore wind farm.

The components of the Siemens Gamesa wind turbines are delivered from Denmark’s mainland. In Roenne, the various parts are assembled. In sets of four wind turbines, they are loaded on board Jan De Nul’s jack-up installation vessel Vole au vent, after which the vessel sails to the offshore installation site off the Danish east coast.

Reynvoet added: “When a large installation vessel like the Vole au vent enters a port for the first time, it is always a bit exciting. Moreover, it was new for everyone involved, but thanks to the top service of the port and our local partners, Roenne turns out to be a perfect marshalling harbour. An absolute boost in these challenging times.”

In 2017 and 2018, Jan De Nul Group designed, built and installed two large gravity-based foundations for the offshore high-voltage substations of this new offshore wind farm.

Jan De Nul built both concrete structures of 8,000 and 10,000 tonnes on a floating pontoon in the port of Ostend (Belgium) and then tugged them to Denmark. In the Baltic Sea, the crane vessel Rambiz installed both foundations on the seabed with the utmost precision.

Vattenfall secured rights to the 604.8 MW Kriegers Flak project in November 2016, with a winning bid of EUR 49.9 per MWh. Kriegers Flak is expected to provide enough power to cover the annual electricity consumption of approximately 600,000 Danish households.

For more information on offshore wind farms worldwide, click here.

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Kriegers Flak turbine installation reaches halfway mark

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