The Project in brief
The wind farm off the bay of Saint-Brieuc
The park
• 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 center 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 buried inter-wind turbine cables (Prysmian).
Saint-Malo maintenance port
Lézardrieux technical base
The park
The offshore electrical substation
Wind turbines
Saint-Malo maintenance port
Lézardrieux technical base
The offshore wind project off the coast of Saint-Brieuc Bay is being developed by Ailes Marines , a company 100% owned by the energy company IBERDROLA .
Winner in April 2012 of call for tender 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 State French, off the Costa Rican coast.
The Saint-Brieuc offshore wind farm is made up of 62 Siemens Gamesa Renewable Energy 8 Megawatt wind turbines , for a total power of 496 Megawatts . The turbines are spread over an area of 75 km², the nearest wind turbine being located 16.3 km from the Breton coast.
The 62 wind turbines are arranged in 7 lines of 3 to 14 wind turbines , spaced approximately 1,300 meters apart.
Within each line, 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 was carried out by the companies Van Oord and SAIPEM .
Installation work began in the first half of 2021, for gradual commissioning in spring 2024 . The expected energy production will amount to 1,850 Gigawatt hours , or the equivalent of the electricity consumption of 835,000 inhabitants , heating included.
496 megawatts
Park power
With an installed power of 496 MegaWatts, the wind farm project off the coast of Saint-Brieuc Bay is located in the area defined by the French State as part of the call for tenders for wind power installations of offshore electricity production in France, in the Côtes-d'Armor department (22) in Brittany.
835,000 inhabitants
Annual production
With an annual production of 1,820 G igaWatt Hours , the Saint-Brieuc Bay wind farm will provide the equivalent of the consumption of 835,000 inhabitants , or nearly 9% of Brittany's total electricity consumption .
1st half of 2021
Start of installation work
In spring 2024
Gradual commissioning
Wind turbines
Jacket-type foundations are made up of a metal mesh fixed to the bottom by three piles.
● The network of inter-wind turbine cables set up by Prysmian makes it possible to transport the electricity produced by the wind turbines to the offshore electrical substation located in the center of the park.
● Two export cables are also installed and operated by RTE. The cables run from the electrical substation to Caroual beach , in the Municipality of Erquy.
The offshore substation
A key element of a marine wind farm, the electrical substation transforms the energy produced by the machines to transfer it to land. For the Saint-Brieuc bay park, it goes from 66 kV to 225 kV in order to limit energy losses.
The Eiffage Métal company is in charge of the engineering and construction of the upper part of the substation, housing the transformers and electrical equipment. The company also manufactures the substation foundations. ENGIE Solutions will carry out the final assembly work and commissioning tests.
The substation will collect the electricity produced by the 62 wind turbines by raising the electrical voltage, through power transformers. The electricity will then be transported by the Electricity Transport Network (RTE) via two export cables with a voltage of 225,000 volts.
Installation is carried out by the SAIPEM company.
The location area
The area of the park is 75 km2 and is located in a concession area of 103 km2. The seabed there is between 29 and 42 meters deep compared to the Astronomical Lowest Seas* .
This area is 9 kilometers wide in the southwest/northeast direction and approximately 15 kilometers long in the northwest/southeast direction.
Astronomical Lowest Seas :
The level of Astronomical Lowest Seas (PBMA) corresponds to the hydrographic zero of nautical charts, also called 0 Marine Level (0 cm).