March 27, 2019
Jan De Nul to Repair Offshore Cables in German Waters

TenneT has awarded a framework agreement to Jan De Nul Group for repairs of TenneT’s offshore high-voltage cables in the German Bight. 

Jan De Nul Group will mobilise in the event of high-voltage cable system faults or failures within the contractual period. The scope entails repairs of all TenneT’s existing HVAC cable systems connecting individual wind farms to the offshore convertor stations or directly to the onshore grid, as well as repairs of all TenneT’s HVDC cable systems connecting the offshore convertor stations to the onshore grid. 

In addition, any future connections commissioned within the duration of the agreement will be added to Jan De Nul’s scope. The contract covers a period of 24 months with two optional extensions of 12 months each.

Isaac Newton and Willem de Vlamingh

Jan De Nul Group has already initiated the preparatory engineering works required to perform the cable repairs. In the event of an HV cable system fault or failure, Jan De Nul will immediately mobilise one of its offshore cable laying vessels, either the Isaac Newton or Willem de Vlamingh.

In 2018, the Willem de Vlamingh installed HV cables to connect the Trianel Windpark Borkum and Borkum Riffgrund II wind farms to TenneT’s DolWin Gamma and Alpha offshore convertor stations. These cables are also subject of this framework agreement.

Picture: One of Jan De Nul's offshore cable laying vessels, the Willem de Vlamingh.

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