Under the terms of the deal, Schneider will provide the transformers and circuit breakers for Areva's offshore projects in the country.
The selection of Schneider as preferred supplier includes a deal for the 500MW Saint Brieuc project off the coast of Brittany in northern France.
Areva plans to install 100 of its M5000 turbines on the project, which is expected to be completed in 2018, but is still in the consenting stage.
The deal also covers the current tenders for the offshore wind farms at Le Tréport off the coast of Normandy and near the islands of Yeu and Noirmoutier in the Loire region.