Planted 9 miles off one of Normandy’s oldest fishing ports, the first turbine of a 500 MW French Channel wind farm stood up in mid June, and the jackup crossed straight from its last job
The jackup vessel had not long finished its previous job when it moved on.
Vole au Vent spent early 2026 planting the last of 61 turbines off the Vendée coast.
Then it turned its crane north.
France has been slower than Britain or Germany to commission large fixed bottom offshore wind farms, and Dieppe Le Tréport arrives as that pace visibly accelerates.
By mid June it was standing on the Channel floor, 9 miles off the sea wall at Le Tréport.
The first of 62 turbines destined for the 500 MW Dieppe Le Tréport wind farm was rising from the water.
What does it take to put a steel tower into water that storms have crossed since the Norman conquest?
How a jackup turns rolling sea into a building site
A jackup installation vessel carries its own legs, steel columns that reach down through the water column and drive into the seabed until the hull lifts clear of the surface entirely. Sitting on the Channel floor, the vessel stops pitching and becomes, for the hours of a lift, a platform rigid enough to hoist a machine weighing several hundred metric tons.
That stability is what lets a crew bolt a nacelle and three blades onto a foundation with the precision the tolerances demand. Without it, even a gentle Channel swell would make the crane tip unpredictable. So the entire sequence, jack down, lift tower, set nacelle, lock blades, happens in a window of calm the crew has already calculated will hold.
Every lift sequence follows that same order without exception. The turbines going into the farm each carry a rotor 548 feet across. At 8 MW apiece, a single machine running at full output for a year matches the electricity consumption of roughly 4,000 French households, and all 62 together would cover around 850,000 people.
The coast that was waiting longest
Dieppe and Le Tréport are two of the most active fishing ports on the Normandy and Picardy coast, and the water between them and the turbine zone has been a working ground since well before the industrial age.
The wind farm sits 9 miles off Le Tréport and 10 miles off Dieppe, close enough that the towers will be visible from the clifftops on a clear morning. That proximity made the project one of the most debated in France’s offshore wind program, and the debate shaped how it was finally built.
Frédéric Flaus, the project’s director, acknowledged that reality plainly: “The project relies on a strong and largely European supply chain, while maintaining continuous dialogue with local stakeholders and sea users to ensure its successful integration at sea.”
The offshore substation, built at a French shipyard, was already sitting on the seabed when Vole au Vent arrived. So the moment the first turbine’s cable is run and tested, the electrons have somewhere to go.
Where the parts came from
Almost nothing about this supply chain traveled far. The nacelles and blades for all 62 turbines were manufactured at a facility in Le Havre, roughly 60 miles down the coast from the farm site.
Tower sections were fabricated in Bilbao and fully equipped in Brest before crossing the Bay of Biscay and turning up the Channel. That routing made the logistics unusual: steel produced in northern Spain, blades built in Normandy, and a Belgian jackup completing a loop between two countries before reaching the turbine zone.
The installation contractor also brought in a second marine contractor for offshore works. Multiple Channel ports fed the campaign at once, and the farm’s internal cable array means each new turbine becomes a live cell in the grid the moment its connection test clears.
The complication the Channel always adds
The English Channel is among the world’s busiest shipping lanes, and the French fishing fleet using the grounds around Dieppe and Le Tréport has formal navigation rights that any offshore structure must respect.
Supply boats and crew transfer craft all operate inside traffic separation schemes that govern the Channel, so the construction schedule bends to the rules of the lane as much as to the weather. Current and tidal range compound the problem further.
The Channel’s tidal swing at this latitude can exceed 25 feet, so the window in which a jackup can safely lower its legs is narrower than at most North Sea sites. Every turbine set requires its own tidal calculation, and a single miscalculation delays the whole campaign by a full cycle.
What the farm means on the French grid
France has been slower than Britain or Germany to commission large fixed bottom offshore wind farms, and Dieppe Le Tréport arrives as that pace visibly accelerates. Earlier in 2026, the operator brought the Îles d’Yeu et de Noirmoutier offshore wind farm into full operation and delivered first power from the Éoliennes Flottantes du Golfe du Lion floating project. The operator’s first turbine announcement confirmed that the substation is already in place and that grid connection will follow as each machine is commissioned.
That gives the French grid three offshore milestones in a single calendar year. Grid connection timing is the complication worth watching now that the substation sits in place and the first turbine stands.
For the fishing towns of Dieppe and Le Tréport, the towers they debated for years are now objects you could sail out and touch in twenty minutes. For a sense of what the same move looks like on deep water, the long record of a floating wind farm and its fishing grounds carries a different set of answers.
And for anyone curious how moving a similarly huge rotor across a coast without a road actually unfolds, the close arithmetic of a blade convoy working a tight curve shows how little margin the numbers leave.
Hugo is an engineer with strong technical expertise. Multilingual from an early age, his writing combines technical clarity with a strong interest in science and energy.
