Saint-Brieuc Offshore Wind Farm

Initial description of fishing activities in the wind farm area.

Initial description of fishing activities in the wind farm area.

Initial description of fishing activities in the wind farm area.

The two scenarios showed negligeable and short-term effects from sediment resuspension and dispersal to benthic species like scallops.

Measurements showed that high frequencies don't propagate as far as low frequencies; neither were detectable beyond 3,750 m. Background noise included wave, wind, Risso dolphins, and fishing boats.

The two scenarios showed negligeable and short-term effects from sediment resuspension and dispersal to benthic species like scallops.

Measurements showed that high frequencies don't propagate as far as low frequencies; neither were detectable beyond 3,750 m. Background noise included wave, wind, Risso dolphins, and fishing boats.

The two scenarios showed negligeable and short-term effects from sediment resuspension and dispersal to benthic species like scallops.

Measurements showed that high frequencies don't propagate as far as low frequencies; neither were detectable beyond 3,750 m. Background noise included wave, wind, Risso dolphins, and fishing boats.

Baseline – Results refine the distribution of Alcidae, kittiwakes, gulls (European herring, lesser black-backed, and great black-backed), little egret, oystercatcher, European shag, great cormorant, Manx shearwater, European storm petrel.

Construction – The same trends were observed as during baseline.

Operations – A new nursery area for common murres was discovered in 2024 west of the wind farm area.

Baseline – Evening surveys highlighted that the male / juvenile pairs departed colonies toward the NNE to NE directions, out of the wind farm area.

Construction – The same trends were observed as during baseline.

Operations – The same trends were observed as during baseline.

Baseline – The 2020 surveys highlighted the presence of 51 migratory species, 41 of them during spring and 28 during fall migrations. The simultaneous use of horizontal and vertical radars enabled distinguishing flight heights.

Construction – The numbers of migratory species recorded during the construction years were relatively similar to the baseline.

Operations – Ongoing.

Baseline – Results refine the distribution of Alcidae, kittiwakes, gulls (European herring, lesser black-backed, and great black-backed), little egret, oystercatcher, European shag, great cormorant, Manx shearwater, European storm petrel.

Construction – The same trends were observed as during baseline.

Operations – A new nursery area for common murres was discovered in 2024 west of the wind farm area.

Baseline – Evening surveys highlighted that the male / juvenile pairs departed colonies toward the NNE to NE directions, out of the wind farm area.

Construction – The same trends were observed as during baseline.

Operations – The same trends were observed as during baseline.

Baseline – The 2020 surveys highlighted the presence of 51 migratory species, 41 of them during spring and 28 during fall migrations. The simultaneous use of horizontal and vertical radars enabled distinguishing flight heights.

Construction – The numbers of migratory species recorded during the construction years were relatively similar to the baseline.

Operations – Ongoing.

Baseline – Results refine the distribution of Alcidae, kittiwakes, gulls (European herring, lesser black-backed, and great black-backed), little egret, oystercatcher, European shag, great cormorant, Manx shearwater, European storm petrel.

Construction – The same trends were observed as during baseline.

Operations – A new nursery area for common murres was discovered in 2024 west of the wind farm area.

Baseline – Evening surveys highlighted that the male / juvenile pairs departed colonies toward the NNE to NE directions, out of the wind farm area.

Construction – The same trends were observed as during baseline.

Operations – The same trends were observed as during baseline.

Baseline – The 2020 surveys highlighted the presence of 51 migratory species, 41 of them during spring and 28 during fall migrations. The simultaneous use of horizontal and vertical radars enabled distinguishing flight heights.

Construction – The numbers of migratory species recorded during the construction years were relatively similar to the baseline.

Operations – Ongoing.

Baseline – 24 boat surveys were completed, during which 116 marine mammals from 4 species and 8403 seabirds from 71 taxa were identified. 13 aerial surveys were also completed during which 111 marine mammals from 4 species and 10886 seabirds from 41 taxa were identified.

Construction – The abundance of seabirds and marine mammals was greater during the three years of construction than baseline, but proportions per families are similar year to year. Normal hunting and travel behavior by marine mammals were observed.

Operations – The trends observed during construction were still observed during the first year of operation.

Baseline – 24 boat surveys were completed, during which 116 marine mammals from 4 species and 8403 seabirds from 71 taxa were identified. 13 aerial surveys were also completed during which 111 marine mammals from 4 species and 10886 seabirds from 41 taxa were identified.

Construction – The abundance of seabirds and marine mammals was greater during the three years of construction than baseline, but proportions per families are similar year to year. Normal hunting and travel behavior by marine mammals were observed.

Operations – The trends observed during construction were still observed during the first year of operation.

Baseline – 24 boat surveys were completed, during which 116 marine mammals from 4 species and 8403 seabirds from 71 taxa were identified. 13 aerial surveys were also completed during which 111 marine mammals from 4 species and 10886 seabirds from 41 taxa were identified.

Construction – The abundance of seabirds and marine mammals was greater during the three years of construction than baseline, but proportions per families are similar year to year. Normal hunting and travel behavior by marine mammals were observed.

Operations – The trends observed during construction were still observed during the first year of operation.

Baseline – 40 samples were collected and enabled the identification of 165 benthic species typical of the area.

Construction – Results were very similar to baseline, though with a slight increase in diversity and density of infauna in soft sediments.

Operations – Results were very similar to previous years.

Baseline – 40 samples were collected and enabled the identification of 165 benthic species typical of the area.

Construction – Results were very similar to baseline, though with a slight increase in diversity and density of infauna in soft sediments.

Operations – Results were very similar to previous years.

Baseline – 40 samples were collected and enabled the identification of 165 benthic species typical of the area.

Construction – Results were very similar to baseline, though with a slight increase in diversity and density of infauna in soft sediments.

Operations – Results were very similar to previous years.

Baseline – 32 surveys were conducted between 2018 and 2021. High variability was observed in scallop and whelk distribution, with low density within the wind farm area. Little spatiotemporal variability was observed in the distribution of sea spider and non-scallop bivalves, but important seasonal variability was observed for whelks, demersal fish, and cuttlefish.

Construction – No effect of construction activities could be detected on abundance, biomass, diversity, or spatiotemporal distribution of surveyed species.

Operations – Ongoing.

Baseline – 32 surveys were conducted between 2018 and 2021. High variability was observed in scallop and whelk distribution, with low density within the wind farm area. Little spatiotemporal variability was observed in the distribution of sea spider and non-scallop bivalves, but important seasonal variability was observed for whelks, demersal fish, and cuttlefish.

Construction – No effect of construction activities could be detected on abundance, biomass, diversity, or spatiotemporal distribution of surveyed species.

Operations – Ongoing.

Baseline – 32 surveys were conducted between 2018 and 2021. High variability was observed in scallop and whelk distribution, with low density within the wind farm area. Little spatiotemporal variability was observed in the distribution of sea spider and non-scallop bivalves, but important seasonal variability was observed for whelks, demersal fish, and cuttlefish.

Construction – No effect of construction activities could be detected on abundance, biomass, diversity, or spatiotemporal distribution of surveyed species.

Operations – Ongoing.

Baseline – 16,036 hours were recorded over 12 months, during which 6 marine mammal species were identified.

Construction – During the 4 years of construction, 23,418 hours were recorded, during which 6 marine mammal species were identified.

Operations – No differences from the previous years were observed during the first year of operation.

Baseline – 16,036 hours were recorded over 12 months, during which 6 marine mammal species were identified.

Construction – During the 4 years of construction, 23,418 hours were recorded, during which 6 marine mammal species were identified.

Operations – No differences from the previous years were observed during the first year of operation.

Baseline – 16,036 hours were recorded over 12 months, during which 6 marine mammal species were identified.

Construction – During the 4 years of construction, 23,418 hours were recorded, during which 6 marine mammal species were identified.

Operations – No differences from the previous years were observed during the first year of operation.

Baseline – Water quality measurements were consistent with the natural variability of the area; no pollution was detected. Sediments are mostly coarse sand to gravel and pebble.

Construction – Results were very similar to baseline.

Operations – Results were very similar to previous years.

Baseline – Water quality measurements were consistent with the natural variability of the area; no pollution was detected. Sediments are mostly coarse sand to gravel and pebble.

Construction – Results were very similar to baseline.

Operations – Results were very similar to previous years.

Baseline – Water quality measurements were consistent with the natural variability of the area; no pollution was detected. Sediments are mostly coarse sand to gravel and pebble.

Construction – Results were very similar to baseline.

Operations – Results were very similar to previous years.

Underwater noise levels were not correlated to substrate type, number of drill bits used, or drilling speed. Noise levels were mostly associated with drilling vessel activity (e.g., dynamic positioning) and were not louder than ambient vessel traffic.

Results were on par with natural variability, with very localized and short duration impacts.

Underwater noise levels were not correlated to substrate type, number of drill bits used, or drilling speed. Noise levels were mostly associated with drilling vessel activity (e.g., dynamic positioning) and were not louder than ambient vessel traffic.

Results were on par with natural variability, with very localized and short duration impacts.

Underwater noise levels were not correlated to substrate type, number of drill bits used, or drilling speed. Noise levels were mostly associated with drilling vessel activity (e.g., dynamic positioning) and were not louder than ambient vessel traffic.

Results were on par with natural variability, with very localized and short duration impacts.

Construction – Several species were identified at night from acoustic recordings, with greater activity during the fall migration of the 1st and 2nd year of construction respectively. Recording from the lighthouse failed during the 3rd year of construction and only 2 species were identified from the boat surveys.

Operations – No bat was detected during the 1st year of operation from the recorders on the turbines.

Construction – Serveral species were identified at night from acoustic recordings, with greater activity during the fall migration of the 1st and 2nd year of construction respectively. Recording from the lighthouse failed during the 3rd year of construction and only 2 species were identified from the boat surveys.

Operations – No bat was detected during the 1st year of operation from the recorders on the turbines.

Construction – Serveral species were identified at night from acoustic recordings, with greater activity during the fall migration of the 1st and 2nd year of construction respectively. Recording from the lighthouse failed during the 3rd year of construction and only 2 species were identified from the boat surveys.

Operations – No bat was detected during the 1st year of operation from the recorders on the turbines.