(OM) Seaway7 recently concluded its scope on SSE Renewables and TotalEnergies’s Seagreen Offshore Wind Farm, after almost two years of offshore construction. The EPCI scope for both foundations and cables on the project was one of the largest contract scopes delivered in offshore wind to date.
Seaway7 implemented suction bucket foundation technology on jackets to overcome the difficult and variable soil conditions, while gaining faster installation speed and avoidance of pile driving noise. The company said this technology was the key contributor to the cost reduction on Seagreen and had never before been deployed at such scale.
Seaway7 was awarded the contract in 2020 by SSE Renewables for the EPCI of the 114 suction bucket foundations and inner-array cables for Seagreen, Scotland’s largest and world’s deepest offshore wind farm. Then, in August 2021, the first jacket foundations arrived on site at the Port of Nigg, shortly followed by the first foundation installation and commencement of the cable lay. In April 2023, the final foundations were installed, including a record-breaking foundation installed at more than 58 m depth, Seaway7 said. The final cable was laid on the project the following month, and Seaway7 completed the full project scope this month.
The client is Seagreen Wind Energy, which is a joint venture between TotalEnergies (51%) and SSE Renewables (49%).
Seagreen Offshore Wind Farm is under construction about 27 km from the coast of Angus in the North Sea. The 1,075-MW wind farm will feature 114 Vestas turbines and an offshore substation. First power was achieved in August 2022, with electricity transmitted via subsea cables to a point near Carnoustie and then to the Tealing substation via underground cables. Seaway7 says the wind farm will provide enough green energy to power more than 1.6 million homes, equivalent to two-thirds of all Scottish homes and will displace more than 2 MMtonnes of CO2 from electricity generated by fossil fuels every year.