Dietswell’s project, Eolfloat, utilises a semi-submersible foundation, known as Trussfloat. It features a triangular base, and could eventually be 50 metres wide and 28 metres deep.
When complete, Trussfloat would initially be able to support wind turbines between 6MW and 8MW, either for two-bladed machines in downwind conditions or three-bladed upwind units, Dietswell said.
The platform could eventually be designed to support turbines up to 13MW, Dietswell added.
A 1:36 scale prototype using a two-bladed downwind turbine has been successfully tested in the Oceanide basin, which simulates ocean conditions, at La Seyne-sur-Mer in the south of France.
Tests involved subjecting the platform to scaled conditions of a storm with 12-metre high waves.
The Eolfloat project will cost €4.6 million, the company added, with commercial launch expected by the end of 2018.
The company, which has half a century’s experience of engineering in the offshore oil industry, secured the funding for its Eolfloat project, under the government’s Investments for the Future program (PIA).
The program covers four categories: vechicles of the future, low-carbon energies, circular economy and smart electricity grids.
In 2014, the government made more than €3.3 billion available for Ademe to award in grants.