Scotland-based Ecosse Subsea Systems has completed a second major seabed clearance project on behalf of DONG Energy on what will be one of the world’s largest offshore windfarms.
The subsea technology specialist cleared more than 3000 boulders at the site of the DONG Energy’s Race Bank Offshore Windfarm, located off the Norfolk and Lincolnshire coast.
The £5 million contract followed the successful completion of a similar project by ESS on DONG Energy’s Westermost Rough offshore windfarm.
ESS teams mobilised several vessels in two campaigns, including the Siem Topaz and Siem Sapphire, on a multi-phased workscope which lasted approximately 175 shipping days.
ESS deployed the latest version of its SCAR 2 Seabed System – a multi-purpose plough capable of boulder clearing, trenching and various seabed route preparation works, while a Multi-Function ROV grab was used to remove boulders and debris which were more sparsely located or situated in awkward positions.
The boulder clearing took place across the export corridor, array cable routes and turbine locations, with 30-metre plus clearance corridors created using multi-pass capability.
ESS commercial director, Keith McDermott, said the project award had reinforced the Banchory-based company’s excellent relationship with DONG Energy following the initial success on the Westermost Rough project.
Mr McDermott said: “We are constantly reviewing SCAR to introduce improvements which bring savings to the client and this latest version SCAR2 has a 15-metre wide capacity compared to earlier 10-metre models.”
“We have built up a wealth of experience in the renewables sector and the SCAR Seabed System is a pioneer in seabed and cable route preparation workscopes. We are targeting a number of planned European windfarm projects where we think ESS can add value to the construction phase.”
By Jake Frith