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Gruissan Floating Offshore Windfarm

Asso.subsea to install the export and inter-array cables of the Vesterhav Nord and Syd projects

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Asso.subsea Limited, a specialized global contractor in the submarine cable industry, has been awarded by Vattenfall for the transportation, installation, protection and commissioning of the 66 kV export and inter-array submarine cables of the 350 MW Vesterhav Nord and Syd offshore windfarms. 

The overall system shall consist of four export and thirty-seven inter-array cables, for a total of more than 70 km to be installed along a submarine route characterized by high technical challenges, including shallow water areas, boulder fields, mobile sediments, and a great variety of conditions from very soft to hard soils.

Asso.subsea will utilize almost the full capacity of its state-of-art fleet, including the DP2 cable laying vessel ‘Atalanti’, specialized in extremely shallow water working environments, and the DP2 trenching support vessels ‘Argo’ and ‘Aethra’ for the seabed preparation and post-lay burial operations. The latest versions of the trenching machines from the AssoTrencher IV as well as the AssoJet III families, among the most powerful trenching/jetting ROVs in the market, will be mobilized in order to provide the required protection of the cables along the whole submarine route.

The completion of the project is scheduled by mid-2023.

Mr. Ioannis Togias, Director of the Marine Division of Asso.subsea Limited, commented: “We are delighted for the opportunity to work with Vattenfall on a so prestigious project, after the positive experience on the Kriegers Flak boulder mitigation campaign. With more than 40 M€ invested only in 2020 for the expansion and upgrades of our fleet, we are extremely proud to be able to support Vattenfall in another fundamental step towards the energy transition”

Asso.subsea to install the export and inter-array cables of the Vesterhav Nord and Syd projects

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