The Project in brief
The wind farm of the Saint-Brieuc bay
The wind farm
- 62 wind turbines of 8 Megawatts
- Power of the park of 496 Mw
- Area of 75 km²
The offshore electrical substation
An electrical substation (GE - Engie - Eiffage) is located in the centre of the wind farm, aligned with the turbines in the fourth row.
Wind turbines
62 wind turbines (Siemens Gamesa Renewable Energy) arranged in 7 lines of 3 to 14 wind turbines, linked together by inter-turbine cables (Prysmian).
Maintenance port of Saint-Malo
Technical base of Lézardrieux
The wind farm
The offshore electrical substation
Wind turbines
Maintenance port of Saint-Malo
Technical base of Lézardrieux
The offshore wind project off the coast of the Bay of Saint-Brieuc is being developed by Ailes Marines, a company wholly owned by the energy company IBERDROLA.
Winner in April 2012 of the call for tenders n°2011/S 126-208873, Ailes Marines is in charge of the development, construction and operation of the offshore wind farm, in the area defined by the French State, off the coast of Côtes-D'Armor.
The Saint-Brieuc offshore wind farm, which is scheduled to be commissioned progressively at the end of 2023, will consist of 62 Siemens Gamesa Renewable Energy 8-megawatt wind turbines, for a total power of 496 megawatts. The turbines will be distributed over an area of 75 km², with the nearest turbine located 16.3 km from the Breton coast.
The expected energy production will amount to 1, ,850 Gigawatt hours, equivalent to the electricity consumption of 835,000 inhabitants, including heating.
The 62 wind turbines will be arranged in 7 lines of 3 to 14 turbines, spaced at approximately 1 300 meters apart. Within each row, the inter-turbine spacing is approximately 1 000 meters.
An electrical substation is located in the center of the wind farm, aligned with the turbines in the fourth row. The transport and installation part is carried out by the companies Van Oord and SAIPEM.
Installation work began in the first half of 2021, with phased commissioning beginning in late 2023.
496 megawatts
Power of the wind farm
With an installed capacity of 496 MegaWatts, the wind farm project off the coast of the Bay of Saint-Brieuc is located in the area defined by the French government as part of the call for tenders for offshore wind power installations in France, in the Côtes-d'Armor department (22) in Brittany.
835,000 inhabitants
Annual production
With an annual production of 1,820 GigaWatt hours, the Saint-Brieuc bay wind farm will supply the equivalent of the consumption of around 835,000 inhabitants, i.e. nearly 9% of Brittany's total electricity consumption.
1st semester 2021
Start of installation work
À From the end of 2023
Progressive commissioning
Wind turbines
● The jacket type foundations are composed of a metal lattice fixed to the bottom by three piles.
● The inter-turbine cable network set up by Prysmian allows the electricity generated by the wind turbines to be transported to the offshore electrical substation located in the center of the park.
● Two export cables are also installed and operated by RTE. The cables go from the electrical substation to the beach of Caroual, on the Commune of Erquy.
The offshore substation
A key element of an offshore wind farm, the electrical substation transforms the energy produced by the machines and transfers it to the land. For the wind farm in the Bay of Saint-Brieuc, the substation will be upgraded from 66 kV to 225 kV in order to limit energy losses.
Eiffage Métal is in charge of the engineering and construction of the upper part of the substation, housing the transformers and electrical equipment. The company is also building the substation's foundations. ENGIE Solutions will carry out the final assembly work and the commissioning tests.
The substation will collect the electricity produced by the 62 wind turbines by raising the voltage through power transformers. The electricity will then be transported by Réseau de Transport d'Electricité (RTE ) via two export cables with a voltage of 225,000 volts.
The installation is carried out by the company SAIPEM.
The area of implantation
The area of the park is 75 km2 and is located on a concession area of 103 km2. The seabed is between 29 and 42 meters deep compared to the Astronomical Lowest Seas*.
This area is approximately 9 kilometers wide in the southwest/northeast direction and approximately 15 kilometers long in the northwest/southeast direction.
Astronomical Low Water Level :
The Astronomical Low Water Level (ALWL) corresponds to the hydrographic chart datum, also known as the 0 Nautical Scale (0 cm).