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ABL appointed by TenneT to support subsea cable installation

The German operations of energy and marine consultancy ABL has been tasked by TenneT to provide marine warranty survey (MWS) services for the subsea cable interconnections between two of Germany’s offshore wind farms, N-3.7 and N-3.8, and the Dolwin 6 offshore converter station.

The three subsea cables to be installed are 40 kilometres long in total. The installation will involve the crossing of dozens of other cables along the installation routes.

ABL’s scope of work will include the technical review and approval of all documentation, procedures and drawings related to the warranted activities, as well as suitability surveys and where necessary dynamic positioning (DP) trials of the proposed fleet for operations. ABL will also resource on-site attendances at fabrication and loadout sites, and offshore, to review and approve transportation and installation (T&I) operations.

ABL Germany, based in Hamburg, will deliver the scope of work under an existing framework agreement with TenneT, a leading European grid operator.

“ABL Germany has long been supporting TenneT’s subsea cable installations, driving maximum safety and efficiency throughout marine operations, thereby enabling maximum value from these all-important assets. We are really pleased to continue collaborating with them.”

Tilo Klappenbach, ABL Germany’s Country Manager

ABL’s scope of work will be concluded in 2026.

ABL is part of Oslo-listed consultancy ABL Group ASA and specialises in marine warranty services, marine assurance and risk, maritime consultancy services, and engineering and consultancy.


ABL Germany shares an office in Hamburg with our sister company, the renewable energy consultants, OWC.

Together we provide a comprehensive technical service offering, covering engineering, marine and consultancy services to support renewable energy projects from concept to operations.

Discover our track-record in German offshore wind in numbers:

  • +20 offshore wind farms
  • +9 GW of capacity
  • +4 wind energy yield assessments for the BSH since 2020
  • +5 marine navigational studies & quantitative navigational analyses for BSH