The Project


In brief

The offshore wind project 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 zone defined by the French Government, off the coast of Brittany.

The wind farm off the Bay of Saint-Brieuc

The wind farm

- 62 wind turbines of 8 Megawatts
- Capacity of the park 496 Mw
- Area of 75 km²


Wind turbines

62 wind turbines (Siemens Gamesa Renewable Energy)
arranged in 7 lines of 3 to 14 turbines, connected by inter-turbine cables (Prysmian).


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.


Within each line, the inter-wind turbine spacing is approximately 1,000 metres.


The wind turbines are spaced about 1,300 metres apart.


The Saint-Brieuc wind farm, which is scheduled to be commissioned in 2023, will be composed of 62 wind turbines. Siemens Gamesa Renewable Energy of 8 Megawatts each, for a total capacity of 496 Megawatts. The turbines will be spread over an area of 75 km², with the nearest wind turbine located 16.3 km from the Breton coast.
The expected energy production will amount to 1,850Gigawatt-hours, roughly 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 approximately by 1,300 metres apart. Within each row, the space between turbines is approximately 1,000 metres.
An electrical substation is located in the centre of the wind farm, aligned with the turbines from the fourth row.
The transport and installation part will be carried out by the companies Van Oord and SAIPEM.

Installation work will begin in the first half of 2021, with commissioning scheduled for the end of 2023.

Some numbers...

Power of the wind farm


With an installed capacity of 496 megawatts, the wind farm project off the Bay of Saint-Brieuc is located in the area defined by the French Government within the framework of the invitation to tender for offshore wind power generation facilities in France, in the Côtes-d'Armor department (22), in Brittany, off the Bay of Saint-Brieuc.

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.

Start of installation work

1st semester 2021


End 2023

Wind turbines

Wind turbines Siemens Gamesa Renewable Energy are fixed on foundations manufactured by Navantia Windar.
The jacket type foundations are made of a wire mesh fixed to the bottom by three piles.

Prysmian 's inter-wind turbine cable network carries the electricity generated by the wind turbines to the offshore power substation located in the centre of the wind farm.

Two export cables are also installed and operated by RTE.The cables go from the power substation to the Caroual beach, in the Commune of Erquy.

The offshore substation

A key element of a marine wind farm is the electrical substation which allows the energy produced by the machines to be transformed and transferred to the land. For the wind farm of Saint-Brieuc bay, it goes from 66kV to 225kV in order to limit energy losses.
Eiffage Métal will be in charge of the engineering and construction of the upper part of the substation, housing the transformers and electrical equipment. The company will also manufacture the foundations of the substation. 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 routed by Réseau de Transport d'Electricité (RTE) via two export cables with a voltage of 225,000 volts.
The installation will be carried out by the company SAIPEM.

The situation of the wind farm in relation to the coast



8.8nautical miles

Cape Frehel



14.2nautical miles

of Saint-Quay-Portrieux



17.8nautical miles

of Saint-Brieuc

The area of implantation


Wind farm area


The park covers an area of 75 km2 and is located on a concession area of 103 km2. The seabed is between 29 and 42 metres deep in relation to the More Astronomical Low Seas*.

The area is about 9 kilometres wide in a southwest/northeast direction and about 15 kilometres long in a northwest/south-east direction.

Pro Area


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