Tideway has completed installation of the export cable for Ørsted’s Hornsea Project One offshore windfarm.
With a length of 467 km, the cable is the longest AC export cable ever installed for an offshore wind project. Installation was completed months ahead of schedule.
The project was the first undertaken by Tideway’s new multipurpose cable installation vessel Living Stone, which has a 10,000-tonne cable capacity and dual-lane cable system.
Together the turntables can transport more than 200 km of cable. With deck space of 3,500 m2 and an innovative cable-handling system with cable handling tools for cable ends, connections and cable protection systems accommodated on deck, Living Stone can also be equipped with a third carrousel with an additional loading capacity of 2,000 tonnes and a 600-tonne capacity crane.
The equipment on board the vessel enables Living Stone to install cables more quickly and more efficiently and in longer lengths and with fewer offshore joints than older cable installation vessels. Living Stone also has a DP3 dynamic positioning system and is an environmentally friendly vessel with dual-fuel engines capable of burning liquefied natural gas. The vessel has a ‘Green Passport’ and the ‘Clean Design’ class notation.
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, and installing two interlink cables.
Tideway also undertook boulder removal, presweeping and cable pull-in to the substations.
The Offshore Wind Journal Conference in London on 5 February 2019 will address key issues including global market developments, increasing turbine sizes, floating offshore wind and industry regulations.