Subsea 7, OHT form fixed wind installation specialist

July 8, 2021
Subsea 7 has agreed to combine its renewables business with OHT ASA.

Offshore staff

LUXEMBOURGSubsea 7 has agreed to combine its renewables business with OHT ASA, subject to approvals.

The new group, headquartered in Oslo, will be renamed Seaway 7 ASA and will be focused on offshore fixed wind. It will be a single provider of standalone, integrated or EPCI services encompassing installation of wind turbines, foundations, offshore substations, submarine cables, and heavy transport.

It will employ around 600 people, with an active fleet of 10 vessels and two further foundation and turbine installation vessels under construction. They are due for delivery in 2022-23.

Since 2009, Subsea 7’s Renewables business unit has installed over 700 foundations, more than 30 substations and over 800 km (497 mi) of submarine cables via its two heavy-lift vessels, two cable-lay vessels and an installation support vessel, employing over personnel in France, Germany, the Netherlands, Poland, Taiwan, the UK, and US.

Subsea 7’s floating wind business is not part of this transaction.

OHT has five heavy transportation vessels, increasingly used to transport large offshore wind structures. Its new vessels under construction are a wind turbine foundation installation DP vessel featuring a ‘smart deck’ to support installation of monopiles and jacket foundations; and a jackup heavy-lift vessel capable of installing the largest wind turbines and wind turbine foundations.

Between 2020 and 2030, Subsea 7 expects the annual installation of wind power, in gigawatts, to grow at a compound average rate above 20%.