Stormskär and Väderskär is a large-scale offshore wind development by Ilmatar Offshore located in Åland territorial waters north of the Åland Islands in the northern Baltic Sea. The project comprises two adjacent sub-areas (Stormskär and Väderskär) that together form a multi-hundred-square-kilome...
In 2023, the project company Ilmatar Stormskär & Väderskär Ab was established as a limited company based in Mariehamn with its main place of business in Helsinki, to operate in wind power electricity production. This entity serves as the dedicated corporate vehicle associated with the Stormskär and Väderskär offshore wind project areas.
Ilmatar Offshore and the Åland Environment and Health Protection Authority (ÅMHM) opened an EIA scoping public consultation (avgränsningssamråd) for the Stormskär and Väderskär offshore wind project, inviting authorities and the public to comment on the scoping document and proposed environmental impact assessment. Stakeholders were asked to submit opinions on the project’s location, scope, and anticipated environmental impacts by 15 September 2023, with consultation meetings planned in August on Åland and the Finnish mainland.
On 19 June 2023, the Finnish Environment Institute, acting as the Espoo Convention competent authority, formally notified Norway and Sweden of the planned Stormskär and Väderskär offshore wind farm in Åland’s territorial waters, initiating a transboundary environmental impact assessment consultation. The notification, accompanied by the scoping document, invited the neighbouring states to participate in assessing potential cross‑border impacts on marine ecosystems, birds, landscape, and other environmental factors.
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By June 2023, Ilmatar Offshore had confirmed the Stormskär and Väderskär project sites within Åland’s territorial waters, defining Stormskär as a 474.5 km² area with up to 131 turbines (15 MW each, 2,000 MW total) and Väderskär as a 96.2 km² area with up to 31 turbines (475 MW), located about 15 km from Åland’s northern coast, 45 km from Finland and 60 km from Sweden, for a combined capacity of around 2.5 GW.
In the EIA scoping documentation transmitted with Finland’s Espoo Convention notification on 19 June 2023, environmental and spatial constraints for the Stormskär and Väderskär offshore wind farm were mapped, with Åland’s Environment and Health Protection Authority identifying potential transboundary impacts on benthic flora and fauna, fish, marine mammals, birds and landscape, and listing key environmental changes such as physical disturbance, sedimentation, underwater and airborne noise, shadowing, visual impacts, pollution and wind wake.
The initial phase of Ilmatar Offshore’s technical seabed (geophysical) surveys for the Stormskär and Väderskär offshore wind project was planned to be completed by early 2023 so that the acquired data could be analysed and used as a basis for the project’s Environmental Impact Assessment report.
In December 2022, Ilmatar Offshore appointed Ramboll Finland to carry out the Environmental Impact Assessment (EIA) work for the Stormskär and Väderskär offshore wind project areas in Åland’s territorial waters, expanding their existing cooperation on other Ilmatar offshore projects.
By October 2022, Ilmatar Offshore had assessed that the approximately 600 km² Stormskär and Väderskär project areas north of Åland could host around 2.1 GW of offshore wind capacity using existing turbine technology, with an estimated annual output of 17 TWh.
Ilmatar Offshore started technical seabed (geophysical) surveys for the planned Stormskär and Väderskär offshore wind project in the maritime areas north of Åland, using only acoustic methods and the Finnish survey vessel Kaiku operated by Arctia, after receiving survey permission from the Parliament of Åland at the end of August 2022.
The Parliament of Åland granted Ilmatar Offshore survey permission at the end of August 2022 to conduct technical seabed investigations for the planned Stormskär and Väderskär offshore wind project in the maritime areas north of Åland. The permit allows Arctia, using its vessel Kaiku, to carry out acoustic seabed surveys that will provide detailed data for Ilmatar’s subsequent environmental impact assessment and turbine siting work.
Åland’s Government adopted its first marine spatial plan in March 2021, identifying offshore areas north of the Åland Islands as potential zones for large‑scale offshore wind; the planned Stormskär and Väderskär project areas lie entirely within these designated potential offshore wind areas.
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