The first offshore wind turbine in France

To date there are no fixed or floating offshore wind turbines in France. The project named Floatgen, managed by Ideol, Centrale Nantes and Bouygues TP is a 2 MW floating wind turbine and will be the first offshore wind turbine in France.

The building of the floating foundation is currently progressing in Saint-Nazaire harbour. The wind turbine will be installed off the coast of Le Croisic on the SEM-REV offshore test site before the end of 2017.

Innovation at all levels

Innovations is present throughout the project, whether it be the concept of a floating foundation in a square ring shape, or the offshore test site itself, or the type of concrete used for building the  floater, or the material used for the mooring lines.

The Centrale Nantes SEM-REV offshore test site, on which the wind turbine will be installed, is a research facility of international scope. It enables full deployment of prototypes which capture ocean energy (wind, waves) in real conditions at sea. Hence, researchers and professionals have access to the necessary tools to test prototypes before the commercial stage.

Key project data


Floater of 36 meters wide and of 9.5 m height (7.5 m draft). Equipped with the Ideaol's Damping Pool ® system and built in prestressed reinforced concrete by Bouygues TP


Model Vestas V80 2MW
Rotor diameter: 80 meters
Mast height including transition piece: 60 meters


Semi-taut mooring
6 synthetic fiber lines (nylon)


Installation on the first French offshore test site dedicated to multi-technologies and connected to the grid: SEM-REV operated by Centrale Nantes and CNRS near the town of Le Croisic.


33 meters deep
12 nautical miles from the shore (22 km)


Particularly harsh conditions with maximum wave height (Hmax) of 16 meters

The floating foundation

June 2017

The floating foundation is built on three barges which were assembled together in “Quai de Charbonniers” in Saint-Nazaire harbour. After a few weeks of preliminary works, the concreting work on the base of the foundation started and the first walls are under construction.
To follow the construction live, the website of the project www.floatgen.eu shows images from a webcam on the building site.

The wind turbine

The Vestas 2 MW V80 that will be installed on the floater was unloaded on Saint-Nazaire harbour in June 2016. It will be slightly modified before being installed along the dock on the transition piece.

The mooring system

Almost all elements from the mooring system were delivered in Saint-Nazaire: chains, mooring lines, buoys, anchors… The mooring system was pre-installed on SEM-REV offshore test site in spring 2017. The floater and the wind turbine will be towed out to the test site during summer 2017. The electrical connection will be performed before the end of 2017.

A project firmly anchored in Pays de la Loire region

70 direct jobs were created for the floater construction in Saint-Nazaire: the concrete used for the foundation developed by Ideol enables a construction close to installation sites. The construction techniques developed by Bouygues TP fit in the local economical context and adapt easily to harbour constraints.
LeBéon Manufacturing is leading the consortium for providing the mooring lines in nylon. A significant amount of parts were produced in their factory in Plouay (Morbihan). Partners of the Floatgen project made the choice to subcontract components, logistic activities, insurance and communication to providers based in the Saint-Nazaire area.

Floatgen: starting point of a serial deployment

The Floatgen project, the first wind turbine in France and first demonstrator of the floating foundation technology developed by Ideol, already provides and will continue to provide unique practical feedback to the partners of the consortium. Lessons will be learnt on building methods, installation and exploitation of the floating system and will be used as a commercial example for export. In July 2016, the French government selected a consortium led by Quadran with the Ideol floater foundation and Bouygues TP know-how, for the construction of a first offshore floating wind farm in the Mediterranean sea (4 units will be installed off Gruissan, one of the best sites for wind resources in Europe). This will be known as the EOLMED project.
Publié le July 3, 2017 Mis à jour le July 6, 2017