East Anglia THREE Completes Offshore Wind Foundation Installation

East Anglia THREE is being developed as a 50:50 joint venture between ScottishPower Renewables and Masdar. The project is designed to generate enough electricity for more than 1.3 million UK homes and is expected to become fully operational by the end of 2026.

The project addresses the need to increase large-scale domestic electricity generation while integrating offshore wind capacity into the UK energy system. Construction is also supporting applications across offshore engineering, marine services, turbine manufacturing and subsea infrastructure.

Foundation installation and engineering
The 95 foundations comprise monopiles and transition pieces. The monopiles weigh between 1,200 and 1,800 tonnes, reach 67 to 84 metres in height and have diameters of up to 10.6 metres. According to the project partners, they are the largest monopiles installed from a jack-up vessel in Europe.

Each transition piece is approximately 20 metres high, 8 metres in diameter and weighs more than 400 tonnes. The installation campaign was carried out by Seaway7 using its jack-up vessel Seaway Ventus, marking the vessel's first completed foundation installation campaign.

The completion of the foundations allows other construction activities to progress. Turbine installation is already under way, while Seaway7 is continuing inter-array cable installation to connect the turbines within the windfarm.

Division of responsibilities
ScottishPower Renewables and Masdar are jointly developing the project, combining offshore wind development, project management and investment capabilities. Seaway7 is responsible for foundation installation and inter-array cable work.

The wider supply chain includes Wood Thilsted for foundation design, Siemens Gamesa's Hull facility for turbine blade manufacturing, and UK-based marine service providers including NR Marine Services and OEG. Partrac is providing metocean and seabed consultancy support.

Project scale and expected impact
The project represents approximately £4 billion of investment, including almost £2 billion directed toward the UK supply chain. Construction is supporting around 2,300 jobs, while approximately 100 long-term roles are expected during the windfarm's operational lifetime.

With all foundations installed, construction can proceed toward completion of the 95-turbine offshore windfarm and its planned 1.4 GW generation capacity.

Edited by Sucithra Mani, Induportals editor – adapted by AI.

www.scottishpowerrenewables.com