Information about the construction phase
For sea users and residents
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Find out about financial compensation measures.
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The main phases of construction
between 2021 and 2023
Active work zones
in 2022
The stages of the construction phase in the active zone
The nautical means mobilized
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The location of the park and the fishing areas
Environmental measures during the construction period
The logistics of the site
Distribution of the work between Ailes Marines and RTE
Active work zones in 2022
Sequencing of works to reduce the impact of the project on fishing activity
Order No. 2022/046 in force
- RUnregulated area for park construction
- NAuthorised navigation
- NFishing allowed
- Zones regulated for park construction
- MProhibition of anchoring, fishing with dragging and passive arts and diving
- Active work area
- MProhibition of anchoring, fishing with dragging and passive arts and diving
The stages of the construction phase in the active zone
From March 2022
Stage 1: Preliminary work
A detailed mapping of the site was carried out before the work, using underwater robots, to identify the last debris/rock blocks that would need to be moved a few dozen metres. Following this stage, protective layers, known as "anti-scouring" (small blocks of a few tens of cm), are installed when necessary. The purpose of these protections is to stabilise the substrate either for the installation phase, under the feet of the ships and equipment, or for the operation phase in order to avoid scouring the structures.
Step 2: Installation of the foundation piles
The 190 piles were transported in 2021 and stored temporarily in Cherbourg. They are being transferred to the construction site by a specialised ship. The construction vessel Aeolus drills the holes that will receive the piles. The piles are then inserted into the holes and sealed into the ground.
Step 3: Installation of the foundations (Jackets type)
After being partly built in Brest and assembled in Fene (Spain), the jackets will be transported on cargo barges towed by an ocean-going tug. Once on site, the jackets are installed by a dedicated vessel which will insert the feet of the jacket into the previously installed piles.
Step 4: Installation of the electrical substation
The electrical substation will be transported by two convoys from Antwerp. The first will transport the jacket, the second the electrical substation module. The vessel "Saipem 7000", one of the largest in the world for this type of operation, will install the elements on the piles that were previously installed in 2021. The operations include the installation and sealing of the jacket on the 4 piles provided for this purpose, the lifting operation of the substation module, the fixing of the elements by welding, as well as the commissioning of the substation components.
Step 5: Installing the cables
Ailes Marines has set itself the objective of burying all the cables in order to ensure maximum maritime safety in the park for sea users, including professional fishermen. The particularly difficult site conditions (very hard rock, numerous boulders, dolerite seams, etc.) mean that the work will be complex and will be carried out in several stages. The 2021 campaign focused on pre-trenching operations, i.e. opening a trench to install the electric cable later. The 2022 campaign aims to install part of the cables.
Step 6: On-site presence
All these activities are carried out by numerous vessels. At the peak of the project, there will be more than 20 vessels on site: about 4 for the pile installation operations (transfer, drilling, boulder removal, substrate stabilisation), 6 for the jackets foundations (tugs, barges, installation vessel), 3 for the cables (laying, trenching, jackets work), 7 for the substation (transport, installation, commissioning).
For more information on the previous steps
Works already completed in 2021
The sealing is carried out while removing the temporary formwork with the drilling jig.
At the end of the first phase of work, the ship AEOLUS drilled at 5 wind turbine sites and at the site of the electrical substation.
A total of 19 boreholes were drilled by the vessel, three quarters of which were at the required depth. The piles were installed in three positions, those of the SB30 and SB26 wind turbines and the electrical substation.
The nautical means mobilized
Aethra
Aethra
Activity: pre-slicing
Size: 95m x 22m
IMO: 9181481
MMSI: 212466000
Havila Subsea
Havila Subsea
Activity: moving boulders
Size: 98m x 20m
IMO: 9505508
MMSI: 259073000
Aeolus
Aeolus
Activity: pile drilling
Size: 140m x 45m
IMO: 9612636
MMSI: 245179000
Bravenes
Bravenes
Activity: installation of riprap
Size: 115m x 28m
IMO : 9756200
MMSI: 244860916
Rem Trader
Rem Trader
Activity: refuelling, a shuttle on non-permanent area
Size: 88m x 19m
IMO: 9529932
MMSI: 209645000
TSM Kermor
TSM Kermor
Activity: communication with sea users in the area
IMO: 9712412
MMSI: 4228123800
Good Help 7
Good Help 7
Activity: communication with sea users in the area
IMO: 9031143
MMSI: 227072990
Windcat 49
Windcat 49
Activity: transport of personnel
IMO: 9945760
MMSI: 228414700
TSM Ushant
TSM Ushant
Activity: on-site support vessel
Size: 36m
IMO: 9899387
MMSI: 228387800
TSM Alizé
TSM Alizé
Activity: guard ship
Size: 45 m
IMO: 9639919
MMSI: 228027700
Distribution of the work between Ailes Marines and RTE
For more information on the electrical connection of the wind farm, visit the RTE website
Environmental measures during the construction period
For more information on all environmental measures
The location of the park and the fishing areas
To find out more about
Wind Farm and Fishing
Financial compensation measures
General situation
Whelks
Scallops
A limited impact on fishing zones during the construction phase and a set of measures taken for make the wind farm compatible with the maintenance of fishing activities during the operation phase
The wind farm is not geographically or geomorphologically located within the 800 km2 of the Bay of Saint Brieuc, but off its coast.
- The positioning of the project avoids the most productive areas of the Bay of Saint-Brieuc ( impact study on the fishing sector carried out by the independent consultancy "Océanic Développement" in 2011).
- Little fishing activity in the project area, particularly in the north (Local Nautical Commission 2016).
- From a spatial point of view, the wind farm represents approximately 2% of the fishery statistics ICES 26E7.
| Study area: | |
 |
Area of the park |
| D’un point de vue spatial, le champ éolien représente un peu plus de 3 % des zones de pêche du bulot de l’ensemble de la Baie de Saint-Brieuc, soit : 1% de la zone A 6% de la zone B 0% de la zone C |
|
 |
Boundary of the scallop beds. |
| Study area: | |
|
Area of the park |
| Maritime boundaries : | |
 |
Maritime border between France and UK. |
| The location of the project completely excludes the wind farm from the "Gisement Principal "and the most productive fishing areas in the Bay. It can therefore be estimated that the spatial extent of the wind farm represents less than 1.5% of the scallop production of the whole Bay. | |
- The entire wind farm is located in the "Gisement du large" and therefore completely excludes the "Gisement Principal" scallop wind farm.
- The production of the offshore deposit represents about 15% of the overall production of the Bay of Saint Brieuc (CNL 2016). The spatial extent of the project represents 6% of the "Gisement du large".
- It can therefore be estimated that the wind farm represents less than 1.5% of the scallop production of the whole Bay.
The logistics of the site
The Le Havre plant
The Brest polder
Construction of the jacket foundation components by the Navantia-Windar Joint Venture
The Saint-Brieuc wind farm
Installation by Van Oord.
Electrical substations :
Installation by Saipem
Lizard & Kerantour
Saint-Brieuc
Regional office of Ailes Marines
Ailes Marines SAS
19 bis, boulevard Clémenceau
22000 Saint-Brieuc
Ship Jack Up - Aeolus
The main companies in the work area
