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.

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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).

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Maintenance port of Saint-Malo

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Technical base of Lézardrieux

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The wind farm

The offshore electrical substation

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Wind turbines

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Maintenance port of Saint-Malo

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Technical base of Lézardrieux

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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.

Le parc éolien en mer de Saint-Brieuc est constitué de 62 éoliennes Siemens Gamesa Renewable Energy de 8 Mégawatts, pour une puissance totale de 496 Mégawatts. Les turbines sont réparties sur une surface de 75 km², l’éolienne la plus proche étant située à 16,3 km des côtes bretonnes.

Les 62 éoliennes sont disposées en 7 lignes de 3 à 14 éoliennes, espacées de 1 300 mètres environ. À l’intérieur de chaque ligne, l’espacement inter-éoliennes est d’environ 1 000 mètres.
Une sous-station électrique est implantée au centre du parc éolien, alignée avec les turbines au sein de la quatrième rangée. La partie transport et installation a été menée par les entreprises Van Oord et SAIPEM.

Les travaux d’installation ont débuté au 1er semestre 2021, pour une mise en service progressive au printemps 2024. La production d’énergie attendue s’élèvera à 1 850 Gigawattheures, soit l’équivalent de la consommation électrique de 835 000 habitants, chauffage compris.

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

Au printemps 2024

Progressive commissioning

Wind turbines

● Siemens Gamesa Renewable Energy wind turbines are mounted on foundations manufactured by Navantia Windar.

● 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.