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Offshore Wind Journal

Engineering firm to design foundations for French offshore windfarm

Mon 07 Jan 2019 by David Foxwell

Engineering firm to design foundations for French offshore windfarm
The St Brieuc offshore windfarm will be built off the coast of Brittany in northern France

A key contract has been awarded for a much-delayed offshore windfarm that is due to be built off France’s northern coast.

Atkins, part of the SNC-Lavalin Group, has been appointed to deliver front end engineering design and detailed design of wind turbine jacket substructures for the St Brieuc offshore windfarm off the coast of Brittany.

Jacket foundations were selected for the project because of the seabed conditions and water depth, which varies considerably across the site. Local fishing organisations also expressed a preference for this type of foundation.

The windfarm is being developed by Ailes Marines, a consortium of Iberdrola, Renewable Energy Systems and Caisse des dépôts.

The scope of work includes designing 62 jackets for the Siemens Gamesa 8-MW turbines selected for the project.

Once operational in 2023, the windfarm will have a total installed capacity of 496 MW.

The deal for the project was awarded in April 2012 following a tender launched by the French Government in 2011 but progress has been much-delayed, as have other Round 1 and 2 projects in France.

All of the Round 1 and 2 projects are expected to finally go ahead, but with reduced tariffs. The future of the projects had come under scrutiny after the steep fall in the cost of offshore wind energy and much lower tariffs awarded recently in other countries.

The projects were originally awarded tariffs of around €200/kWH (US$228/kWH). This has been reduced to approximately €150/kWh.


The Offshore Wind Journal Conference in London on 5 February 2019 will address key issues including global market developments, increasing turbine sizes, floating offshore wind and industry regulations.

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