Saint Brieuc: Iberdrola's first large-scale offshore wind power project in Brittany

When it becomes operational in 2023 it will have a total installed capacity of 496 megawatts (MW), capable of generating enough clean energy for 835,000 people.

Saint-Brieuc Bay, France

Wind turbines number
62 Siemens Gamesa turbines

20 km off the French coast

Total installed capacity
496 MW

2,500 million euros

Start of the operational phase


Brittany is prone to strong winds and high tides, which have shaped the region's landscape, economy and way of life. With a view to leveraging the region's full energy potential, the company designed the Saint-Brieuc offshore wind farm: the first large-scale offshore wind farm in Brittany and one of the first in France to obtain all the necessary government permits for its construction and operation.

With an investment of 2,500 million euros it is estimated that, once commercialisation begins in 2023, it will meet the energy needs of 835,000 people.

This will be possible thanks to a total installed capacity of 496 megawatts (MW) from 62 turbines each generating 8 MW of power, which will cover a surface area of 75 km2 located some 20 km off the French coast.


Saint-Brieuc offshore wind farm location.#RRSSSaint-Brieuc offshore wind farm location.


Iberdrola group, in collaboration with French companies RES and Caisse Des Dépôts, both belonging to the consortium Ailes Marines (in which our company is the main shareholder), has finished the first phase of construction of the project: analysis of the technical and environmental conditions of the site.

This first step involved installing three wind measurement systems in the area where the farm is located and which have recorded the wind power potential in the area during the last two years. They will do so using the LIDAR (Laser Imaging Detection And Ranging) system, which by laser determines in a precise way the direction of the prevailing wind in order to identify the optimum orientation of the wind turbines for the highest possible energy yield.

Saint Brieuc will also have Spanish involvement through Siemens Gamesa Renewable Energy, who will be making the turbines for the wind farm, 207 metres high each. They will be equipped with state-of-the-art 'direct drive' technology and their blades, measuring almost 82 metres in length, will deliver a swept area that is 18% larger than the previous model along with 20% higher annual power production compared to their predecessor.

Once operational, in 2023, it will become the company's fourth such facility after West of Duddon Sands, located in the Irish Sea; Wikinger, in the Baltic Sea — both facilities are now running — and East Anglia ONE, in the southern North Sea, which will be one of the world's largest offshore wind farms.