The wind turbines will be installed on three-legged jacket foundations, 27 km (17 mi) off the coast of Angus in Scotland. After the installation of these jackets, scour protection is required to avoid the effects of erosion. This is achieved by high precision rock installation around the jackets.
For this project, which started at the end of October 2021, the company is deploying the high dynamic flexible fallpipe vessel Bravenes.
According to the company, the Bravenes has a unique method for subsea rock installation thanks to the automated fallpipe system that can be skidded over the side of the vessel. This results in highly accurate and efficient rock installation in close vicinity to the jacket foundations using an ROV.
In addition, the flexible fallpipe vessel Nordnes will be deployed to install scour protection on several cable crossings. All subsea activities will take place in water depths of up to 50 m (164 ft).
The 1.1-GW Seagreen offshore wind farm is a £3-billion ($3.8-billion) joint venture between SSE Renewables and TotalEnergies. SSE Renewables is leading the development and construction of the project, supported by TotalEnergies, and will operate Seagreen on completion.
When completed, Seagreen is expected to be Scotland’s largest, and the world’s deepest, fixed bottom offshore wind farm. It is expected to power 1.6 million homes.