# South Brittany Shared Grid Connection for the Offshore Wind Farms

Publisher: CapexCue
Canonical dossier: <https://capexcue.com/projects/south-brittany-shared-grid-connection-for-the-offshore-wind-farms-e97f087dd83b3df9/>
Dossier reference: release 1 (164e8b3f-1f75-457f-9036-c7b0a98996c8)

Released project intelligence

Oldest supporting observation: 2026-10-03T05:19:14.454557+00:00
Dossier released: 2026-10-16T12:42:23.762505+00:00
Source report dates and capture dates are listed per fact below; neither establishes an event date.

## Project summary

South Brittany Shared Grid Connection for the Offshore Wind Farms (a descriptive English rendering of the project heading) is a planned shared connection for two offshore wind farms in Brittany Sud, France, linking them to the national electricity network. RTE is identified as the connection project owner. The planned works include an offshore substation, three submarine links over 45 km to a landing at Erdeven, and three underground land links over 26 km to an onshore substation at Pluvigner. The environmental authority’s opinion, dated 18 December 2025, expected connection works to start in 2027 and last three years; it gives the installations a 30-year operating life. These are forecasts in that opinion, not confirmation of the current schedule or operating status. The authority says the impact study is to be updated as the wind-farm operations mature and notes imprecision, incompleteness and inconsistencies in the study. Its opinion is neither favorable nor unfavorable and is not itself an authorization decision.

## Evidence limits and unknowns

- The submarine cable burial method was not yet defined in the opinion; it was to depend on dialogue with the works contractor.
- The designation for wind farm 2 was still in progress following a tender, and the ports for wind-farm maintenance bases had not been selected.
- The opinion describes the authorization process but does not establish that the required authorizations have been granted.
- This synthesis uses supplied text from pages 2–12 and 43–44 only; pages 13–42 and graphical content were not interpreted, and OCR was not commissioned.

Current purchasing availability: unknown.
Source-dated plans do not establish current progress or available supplier packages.

## Project metadata

Country: France
Region: Europe
Physical assets: Electricity Transmission
Derived from the exact released evidence; unresolved fields remain unclassified.

## Project category

Energy
Derived from the reviewed activity statement; delivery stage remains unclassified.
Transmission of electricity from both offshore wind farms to the national electricity network through a shared marine and terrestrial connection.
Source: IGEDD environmental authority native opinion text — https://www.igedd.developpement-durable.gouv.fr/IMG/pdf/6_-_parc_eoliens_en_zone_bretagne_sud_raccordement_mutualise_au_reseau_electrique_mecdu_cle293d4a.pdf | published unknown | observed 2026-10-03T05:19:14.454557+00:00

Project overview
Oldest decisive evidence: 2026-10-03T05:19:14.454557+00:00
Newest evidence: 2026-10-03T05:19:14.454557+00:00
Knowledge reviewed: 2026-10-16T12:42:22.113199+00:00
Publication reviewed: 2026-10-16T12:42:22.113199+00:00

## Name
South Brittany Shared Grid Connection for the Offshore Wind Farms
Status: reported
Attribution: IGEDD Autorité environnementale opinion: authority synthesis and attributed developer facts
Source: IGEDD environmental authority native opinion text — https://www.igedd.developpement-durable.gouv.fr/IMG/pdf/6_-_parc_eoliens_en_zone_bretagne_sud_raccordement_mutualise_au_reseau_electrique_mecdu_cle293d4a.pdf | published unknown | observed 2026-10-03T05:19:14.454557+00:00

## Scope
The shared connection includes an offshore electrical substation, three submarine links over 45 km to the landing at Erdeven, and three underground land links over 26 km to the onshore substation at Pluvigner. The offshore substation is described as 70 m square, 30 m above and 90 m below the sea surface. The submarine links are to be buried 0.3–2.5 m deep; on land, the links use trenches 0.5–0.7 m wide and about 1 m deep. The Pluvigner substation occupies 8.4 ha, with four 28 m pylons connecting it to the electricity network.
Status: planned
Attribution: IGEDD Autorité environnementale opinion: authority synthesis and attributed developer facts
Source: IGEDD environmental authority native opinion text — https://www.igedd.developpement-durable.gouv.fr/IMG/pdf/6_-_parc_eoliens_en_zone_bretagne_sud_raccordement_mutualise_au_reseau_electrique_mecdu_cle293d4a.pdf | published unknown | observed 2026-10-03T05:19:14.454557+00:00

## Country
France.
Status: reported
Attribution: IGEDD Autorité environnementale opinion: authority synthesis and attributed developer facts
Source: IGEDD environmental authority native opinion text — https://www.igedd.developpement-durable.gouv.fr/IMG/pdf/6_-_parc_eoliens_en_zone_bretagne_sud_raccordement_mutualise_au_reseau_electrique_mecdu_cle293d4a.pdf | published unknown | observed 2026-10-03T05:19:14.454557+00:00

## Ecology
The opinion's principal environmental issues concern the integrated project, rather than being separately apportioned to each component: seabed forms and habitats, marine and terrestrial biodiversity, migratory fish, birds and bats, marine mammals, landscape and archaeological heritage, and greenhouse-gas effects. It identifies uncertainty in impact assessment, including wetlands whose individual functional effects could not be concluded from the baseline. For the connection, the opinion describes 15 monitoring measures with follow-up over ten years but no specified corrective measures if conservation objectives are not met; only 10 of 48 avoidance, reduction and compensation measures refer to four monitoring measures. The authority recommends better linkage and corrective measures.
Status: reported
Attribution: IGEDD Autorité environnementale opinion: authority synthesis and attributed developer facts
Source: IGEDD environmental authority native opinion text — https://www.igedd.developpement-durable.gouv.fr/IMG/pdf/6_-_parc_eoliens_en_zone_bretagne_sud_raccordement_mutualise_au_reseau_electrique_mecdu_cle293d4a.pdf | published unknown | observed 2026-10-03T05:19:14.454557+00:00

## Activity
Transmission of electricity from both offshore wind farms to the national electricity network through a shared marine and terrestrial connection.
Status: planned
Attribution: IGEDD Autorité environnementale opinion: authority synthesis and attributed developer facts
Source: IGEDD environmental authority native opinion text — https://www.igedd.developpement-durable.gouv.fr/IMG/pdf/6_-_parc_eoliens_en_zone_bretagne_sud_raccordement_mutualise_au_reseau_electrique_mecdu_cle293d4a.pdf | published unknown | observed 2026-10-03T05:19:14.454557+00:00

## Delivery
Connection works were expected to start in 2027 and last three years. The opinion gives the installations a 30-year operating life.
Status: planned
Attribution: IGEDD Autorité environnementale opinion: authority synthesis and attributed developer facts
Source: IGEDD environmental authority native opinion text — https://www.igedd.developpement-durable.gouv.fr/IMG/pdf/6_-_parc_eoliens_en_zone_bretagne_sud_raccordement_mutualise_au_reseau_electrique_mecdu_cle293d4a.pdf | published unknown | observed 2026-10-03T05:19:14.454557+00:00

## Location
The offshore substation is in territorial waters at the boundary of the exclusive economic zone. The submarine connection comes ashore at Erdeven and runs to an onshore substation at Pluvigner; the project requires local-plan changes in six municipalities.
Status: reported
Attribution: IGEDD Autorité environnementale opinion: authority synthesis and attributed developer facts
Source: IGEDD environmental authority native opinion text — https://www.igedd.developpement-durable.gouv.fr/IMG/pdf/6_-_parc_eoliens_en_zone_bretagne_sud_raccordement_mutualise_au_reseau_electrique_mecdu_cle293d4a.pdf | published unknown | observed 2026-10-03T05:19:14.454557+00:00

## Developer
Réseau de transport d’électricité (RTE) is identified as the project owner for the connection and as responsible for the overall project's environmental impact study in the connection authorization application.
Status: reported
Attribution: IGEDD Autorité environnementale opinion: authority synthesis and attributed developer facts
Source: IGEDD environmental authority native opinion text — https://www.igedd.developpement-durable.gouv.fr/IMG/pdf/6_-_parc_eoliens_en_zone_bretagne_sud_raccordement_mutualise_au_reseau_electrique_mecdu_cle293d4a.pdf | published unknown | observed 2026-10-03T05:19:14.454557+00:00

## Regulatory
The connection environmental authorization is part of a process that precedes the two wind-farm authorization procedures; the overall impact assessment is to be updated as the operations mature. The project requires local-plan compatibility changes in six municipalities and partial downgrading of 14 classified wooded areas. The opinion reports the dossier's residual impact assessment for those local-plan changes as negligible. The environmental authority's opinion is not an authorization decision and is neither favorable nor unfavorable.
Status: reported
Attribution: IGEDD Autorité environnementale opinion: authority synthesis and attributed developer facts
Source: IGEDD environmental authority native opinion text — https://www.igedd.developpement-durable.gouv.fr/IMG/pdf/6_-_parc_eoliens_en_zone_bretagne_sud_raccordement_mutualise_au_reseau_electrique_mecdu_cle293d4a.pdf | published unknown | observed 2026-10-03T05:19:14.454557+00:00


## Cite this dossier

CapexCue — South Brittany Shared Grid Connection for the Offshore Wind Farms — dossier released 2026-10-16T12:42:23.762505+00:00, release 1 (164e8b3f-1f75-457f-9036-c7b0a98996c8) — https://capexcue.com/projects/south-brittany-shared-grid-connection-for-the-offshore-wind-farms-e97f087dd83b3df9/.

For current information and later dossier updates, visit <https://capexcue.com/projects/south-brittany-shared-grid-connection-for-the-offshore-wind-farms-e97f087dd83b3df9/>.
This file records the release identified above; the current dossier may change.