Ocean Winds, the offshore wind joint venture created by EDP Renewables and ENGIE, has announced the successful installation of the first jacket foundation at the Dieppe – Le Tréport offshore wind farm site. Located approximately 17 kilometres off the coast of Dieppe and 15.5 kilometres from Le Tréport, the project will consist of 62 turbines. Once operational, the farm will generate electricity equivalent to the consumption of nearly 850,000 people.
Gradual offshore installation rollout
This foundation is the first in a series to be installed through to 2026, as part of successive offshore campaigns. It follows the earlier installation of the project’s offshore substation. The foundations are made of steel jacket structures fabricated in Spain, measuring between 48 and 55 metres high depending on water depth. They are anchored to the seabed using pre-installed steel piles with diameters of 2.5 metres and lengths of up to 63 metres.
French logistical and industrial mobilisation
The foundations are transported from the port of Cherbourg to the offshore site by the Innovation installation vessel operated by DEME. The project also involves other French port infrastructures, including Le Havre, where several turbine components are manufactured. This logistical coordination demonstrates the ability of the French industrial network to deliver on large-scale offshore wind projects, aligned with national energy production targets.
1 GW under simultaneous construction in France
The Dieppe – Le Tréport project complements two other major developments by Ocean Winds in France: the Yeu-Noirmoutier (EMYN) wind farm, with over half of its turbines already installed, and the floating wind project Eoliennes Flottantes du Golfe du Lion (EFGL), comprising three turbines offshore. Together, these projects represent over 1 GW of capacity currently under construction in France.
Marc Hirt, Ocean Winds’ Country Manager for France, stated that summer 2025 has been marked by the production of the company’s first offshore wind electrons in France, while the EMDT construction further strengthens its industrial footprint in the domestic market.
Construction schedule through 2026
According to Frédéric Flaus, EMDT Project Director, the installation of the first foundation marks “the beginning of a new chapter” for the energy infrastructure. The upcoming phases of the works will see the progressive installation of the remaining 61 foundations, followed by turbine assembly and full connection scheduled by 2026. The construction involves technical and industrial teams based across several French and European sites.
