On 22 April 2026, Fred. Olsen Seawind agreed to acquire Vattenfall’s 50% stake in the Muir Mhòr floating offshore wind project via a share sale, which will give Fred. Olsen Seawind 100% ownership of the project subject to regulatory approvals, including consent from Crown Estate Scotland for the seabed lease; the project will continue development on schedule towards early‑2030s operation.
In October 2025, a public notice of additional information for the Muir Mhòr Offshore Wind Farm was issued in relation to the Section 36 and Marine Licence applications, initiating further public consultation on the newly submitted environmental information.
On 6 October 2025, Muir Mhòr Offshore Wind Farm Ltd submitted an Additional Information Report, including updated chapters such as offshore and intertidal ornithology compensation, to Marine Scotland to supplement the original offshore EIA and support the ongoing determination of the Section 36 and Marine Licence applications.
Upgrade to access detailed cable specifications, supply chain data, projected timeline, financial analysis, and more.
Muir Mhòr is a commercial-scale floating offshore wind farm project located in the North Sea approximately 63 km east of Peterhead on Scotland’s northeast coast, with a design envelope of around 200 km² and capacity of up to 1 GW. Promoted initially as a 50:50 joint venture between Fred. Olsen Se...
Owners
Muir Mhòr–Longside connection, Longside–E2b radial offshore, Muir Mhòr Offshore Wind Farm, Muir Mhor Offshore Wind Farm, Muir Mhòr floating offshore wind farm, Muir Mhor Floating Offshore Wind Farm, ScotWind E2, Muir Mhòr Offshore Wind Farm Ltd, Mara Mhor, Mara Mhòr Offshore Wind Farm, Muir Mhòr (E2-1), CRT-2A, Plan Option Area E2, Cumhachd Cumhachd Ri Teachd 2A, E2-B floating wind farm, MARA MHÒR OFFSHORE WIND FARM LIMITED, FORVF PROJECTCO2 LIMITED, ScotWind (seabed rights awarded Jan 2022)
In June 2025, Aberdeenshire Council’s Infrastructure Services Committee granted Planning Permission in Principle for the Muir Mhòr offshore wind farm onshore works, comprising underground export cabling and a new onshore substation near Peterhead to connect the project to the National Grid. This decision approved the onshore transmission infrastructure, following extensive consultation and an Environmental Impact Assessment led by LUC, enabling the Muir Mhòr project’s 1 GW of offshore generation to be connected into the GB transmission system.
By 10 December 2024, Muir Mhòr Offshore Wind Farm Ltd had completed a twelve‑month period of consultation with local communities and stakeholders most affected by the development, forming the basis for its subsequent submission of both offshore and onshore consent applications.
By 10 December 2024, Muir Mhòr Offshore Wind Farm Ltd had submitted an onshore planning application, supported by an onshore Environmental Impact Assessment Report and Planning Statement, to Aberdeenshire Council for landfall works, underground export cables, an onshore substation, and connection to the SSEN Netherton Hub.
By December 2024, the Muir Mhòr project team, a joint venture between Fred. Olsen Seawind and Vattenfall, had completed detailed grid connection and cable route engineering for the Muir Mhòr Transmission system. Using Continuum Industries’ Optioneer tool, they evaluated export cable routes linking 17 potential landfall locations and more than five onshore substation sites along the east coast of Scotland, integrating environmental, social, engineering and cost constraints to select a preferred connection option and final cable corridor for the Planning Permission in Principle (PPP) application. The resulting design brings offshore export cables ashore via horizontal directional drilling at Lunderton Bay about 1 km north of Peterhead, then follows an underground onshore cable corridor of approximately 4 km to a new 275/400 kV onshore substation at Westerton near Torterston, and a further 4 km underground link to Scottish and Southern Electricity Networks Transmission’s planned 400 kV Netherton Hub, with the corridor defined up to 100 m wide and up to 15 km from landfall to the grid point. The onshore transmission works are engineered to accommodate 2 GW of future coordinated connection capacity through ducting for six cable circuits, with three export cables forming the initial 1 GW Muir Mhòr connection, and the routeing process was supported by GIS-based analysis, environmental surveys, civil engineering studies and site walkovers.
On 5 December 2024, the Environmental Impact Assessment Report for the Muir Mhòr Offshore Wind Farm was formally submitted to Marine Scotland as part of the Marine Licence and Section 36 consent applications for the offshore generating station and associated transmission works.
On 22 November 2024, Muir Mhòr Offshore Wind Farm Ltd submitted a Section 36 consent application for construction and operation of the offshore generating station, together with associated Marine Licence applications for the generating station and offshore transmission works, for the approximately 1 GW floating wind project 63 km east of Peterhead.
In June 2024, Muir Mhòr Offshore Wind Farm Ltd submitted a Planning Permission in Principle (PPP) application to Aberdeenshire Council for the onshore transmission infrastructure required to connect the Muir Mhòr floating offshore wind farm to the GB transmission system. The application (reference APP/2024/2000) covers formation of the onshore landfall at Lunderton Bay, installation of underground export cables from landfall through a new onshore substation near Peterhead, and onward cable connection to the proposed SSEN Transmission 400 kV Netherton substation.
In March 2024, joint venture partners Vattenfall and Fred. Olsen Seawind opened a strategic hub dedicated to managing the Muir Mhòr floating offshore wind farm, providing a central base to oversee development activities and support delivery of the project off the east coast of Scotland.
Muir Mhòr Offshore Wind Farm Ltd, the joint venture of Fred. Olsen Seawind and Vattenfall, plans to hold additional public drop‑in consultation events focused on the project’s grid connection, including the landfall, onshore cable route and new onshore substation near Peterhead. These consultations are intended to take place once National Grid ESO’s Holistic Network Design (HND) for the area is published, which was expected around the end of 2023 or beginning of 2024, and will provide further details on the proposed onshore transmission connection to the main electricity network.
Offshore environmental survey campaigns for the Muir Mhòr project, supporting consent for the offshore components including the transmission infrastructure, were completed in 2023, as indicated in the project’s development schedule materials.
After a four‑month campaign that started in April, EGS International completed the preliminary geophysical survey work for the Muir Mhòr floating offshore wind farm and its export cable corridor in early August 2023, providing data on the sea floor and subsea environment to feed into site characterisation, future design and engineering, and the EIA process.
In early August 2023, EGS International also finished the preliminary environmental survey campaign for Muir Mhòr, having gathered detailed information on the sea floor and subsea environment across the offshore area to underpin environmental impact assessment and inform project design.
In April 2023, EGS International mobilised the survey vessel EGS Ventus to begin preliminary geophysical investigations across the Muir Mhòr floating offshore wind farm site and export cable corridor, collecting seabed and sub‑seafloor data to support site characterisation, engineering design and the Environmental Impact Assessment process.
Alongside geophysical work, EGS International also commenced preliminary environmental surveys in April 2023 for the Muir Mhòr project, using high-specification marine equipment to characterise the sea floor and subsea environment over the approximately 200 km² offshore area for input to environmental and ecological assessments.
In February 2023, Muir Mhòr Offshore Wind Farm Ltd submitted an application for an electricity generation licence under section 6(1)(a) of the Electricity Act 1989, a prerequisite regulatory authorisation for operating the planned floating offshore wind farm.
On 23 January 2023, Fred. Olsen Seawind and Vattenfall appointed marine survey services provider EGS to perform geophysical and environmental site investigations for the Muir Mhòr floating offshore wind farm, covering an approximately 200 km² wind farm area and a 100 km² offshore export cable corridor to inform geotechnical design and support an accelerated consents timetable.
On 27 July 2022, the Muir Mhòr Offshore Wind Farm joint venture between Fred. Olsen Seawind and Vattenfall announced it had awarded over £3 million in development contracts to Scottish-based suppliers and appointed Glasgow-based GoBe Consultants, supported by Land Use Consultants’ Scottish planning team, to deliver the project’s Environmental Impact Assessment and Habitats Regulations Assessment.
In January 2022, Muir Mhòr Offshore Wind Farm Limited was established as a 50:50 joint venture between Fred. Olsen Seawind Limited and Vattenfall Wind Power Limited, securing an Option Agreement for the Muir Mhòr ScotWind E2 lease area of approximately 200 km² located about 63 km east of Peterhead and targeting around 1 GW of floating offshore wind capacity.
Muir Mhor Awarded option rights under Crown Estate Scotland's ScotWind leasing round, announced on 17 January 2022. ScotWind awarded 17 sites — a mix of fixed-bottom and floating projects — totalling around 25 GW, making it the largest single offshore wind leasing round to date.
Muir Mhòr Offshore Wind Farm Limited, the project company responsible for the Muir Mhòr offshore wind farm and its associated offshore and onshore transmission infrastructure, is a 50/50 joint venture between Fred. Olsen Seawind Limited and Vattenfall Wind Power Limited. This JV structure underpins development of both the wind farm and the grid connection assets, including the onshore transmission works being taken through planning by Muir Mhòr Offshore Wind Farm Ltd.
Showing historic events only. Subscribe for the full timeline including projected milestones.