Seagreen substation jacket installed

4C Offshore | Tom Russell
By: 21/12/2021 SSE Renewables
Developers of the Seagreen offshore wind farm have celebrated the installation of a jacket in preparation for the project’s offshore substation topside, which is due to be installed in early 2022.

Engineered, constructed and installed by Petrofac and weighing in at a colossal 5,100 tonnes, the six-legged jacket is now fixed to the seabed, at a water depth of around 55m. It will support the offshore substation topside above the sea during Seagreen’s 25-year operational lifespan.

The jacket has a seabed footprint of 43m x 43m and has built in tubing designed to guide the incoming 15 inter-array cables bringing the electricity generated by the turbines to the substation. In addition, the jacket also has tubing to guide the outgoing three export cables from the offshore substation to the seabed.

Once completed in late 2022/early 2023,
Seagreen will consist of 114 Vestas V164-10.0 MW turbines, the first of which was installed last week. Situated around 27km off the Angus coast, the £3bn wind farm is a joint venture between SSE Renewables (49%) and TotalEnergies (51%).
At 1.1GW, Seagreen is Scotland’s largest renewable energy project. The wind farm is expected to be capable of generating around 5,000 GWh of renewable energy annually, enough electricity to power more than 1.6m UK homes.

SSE Renewables is leading the development and construction of the Seagreen project and will serve as operator for its expected 25-year lifetime.

"Hot on the heels of the installation of the first wind turbines comes another significant construction achievement with the offshore platform jacket being placed and secured safely on the seabed. Everyone involved can be justifiably proud of achievements like these which set the foundations for the project’s delivery over the next 12 or so months.

"The installation of the offshore platform will be undertaken alongside the ongoing Seagreen turbine installation programme and the foundation installation campaign.

"First power is expected by early next year with the offshore wind farm expected to enter commercial operation in 2023,"
said John Hill, Seagreen Project Director.

"We are proud to be part of this important project for Scotland’s energy transition, as engineering, procurement, construction and installation contractor. The installation of the Seagreen jacket was completed safely amidst Storm Arwen and Storm Barra, using several measures to minimise environmental impacts, such as low hammer energy and acoustic deterrent devices. We will continue to work closely with our partners to prepare for the safe and successful installation of the 4,800 tonne topside in early 2022,
" commented Vipul Sawe, Petrofac Project Director.

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