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Reported by DEME Group on 13 December 2018

Tideway completes installation of longest AC offshore wind export cable at Hornsea One in the UK

(Courtesy of Dredging, Environmental and Marine Engineering NV)

A world first and a major construction milestone was reached at Ørsted’s Hornsea Project One offshore wind farm in the UK when Tideway completed the export cable installation. With an offshore export cable totalling 467 km, roughly the same distance as Amsterdam to Hamburg, it is the longest AC offshore wind cable ever to have been installed. Additionally, the cable manufacturing and installation were completed months ahead of schedule.

When fully operational in 2020, Hornsea Project One’s 174 turbines will generate enough clean electricity for well over one million homes. The world’s largest offshore wind farm was the first project for Tideway’s new cable installation and multifunctional vessel ‘Living Stone’. With its 10,000-tonne cable capacity and cutting-edge dual-lane cable system, ‘Living Stone’ significantly improves cable installation production rates. The installation scope included laying export cables from three different offshore substations located up to 120 km offshore to the shore via a Reactive Compensation Station, as well as the installation of two interlink cables. Tideway also undertook the boulder removal, pre-sweeping and cable pull-in to the substations, and are completing crossing installation and cable burial.

Modular Offshore Grid

After the successful installation campaign at Hornsea Project One, ‘Living Stone’ will be mobilised for subsea cable installation for Elia’s ‘Modular Offshore Grid’ in the Belgian sector of the North Sea. The so-called ‘electricity plug’, including an Offshore Switchyard Platform, will be connected to four wind farms. Submarine cables will link the platform with a substation in Belgium, where the wind energy will be injected into the Belgian onshore grid.



Dredging, Environmental and Marine Engineering NV. Press release - Tideway completes installation of longest AC offshore wind export cable at Hornsea One in the UK. URL: [Date Accessed: 13/12/2018].

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