Port & Ship Infrastructure News

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Dec 10, 2025
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Greek offshore contractor Asso.subsea has secured a major spread of cable installation and protection work from France’s Nexans across three of TenneT’s flagship 2GW offshore transmission projects in the German North Sea. The awards cover the BalWin3, LanWin2 and LanWin4 developments, with offshore campaigns slated to run from 2027 through 2031.

The multi-year scope, with an undisclosed value, includes more than 650 km of offshore cable burial and over 60 km of nearshore laying and burial. Operations will be centred around the cable-laying vessel Atalanti, which is being outfitted with a modified turntable to handle Nexans’ four-cable bundle configuration — two 525 kV HVDC export cables, one metallic return line and a fibre-optic cable.

Asso.subsea will also deploy its trenching support fleet, including the newbuild Avra, due to join the company in early 2028. Burial work will combine jetting and mechanical trenching using the company’s AssoTrencher IV and AssoJet III systems, backed by full as-laid and as-buried survey coverage. The nearshore element of the projects will involve cable loading and transport from Nexans’ Norwegian facility, as well as beach pulls and simultaneous lay-and-bury operations — areas where Asso.subsea has built a strong track record.

Earlier this year, the company also secured nearshore cable installation scope for TenneT’s BalWin4, LanWin1, and LanWin5, located off the northwestern coast of Baltrum Island.

“These awards are a strong recognition of our ability to execute highly demanding scopes, from precision nearshore operations to deep-water burial campaigns,” said Alessandro Panico, director of business development at Asso.subsea. He added that the latest wins underscore the contractor’s long-running partnership with Nexans and its role in delivering Europe’s expanding offshore grid.

In related news, Enshore Subsea has been awarded a contract for the shallow water cable installation work on the three offshore grid connection systems. The UK-based subsea specialist will be responsible for installing the Wadden Sea sections, with work scheduled for 2027, 2029, and 2030.

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