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Murphy Awarded Cable Installation For Hornsea Project One

Dong Energy has awarded J Murphy & Sons Limited the onshore cable installation contract for Hornsea Project One, which is set to be the world's largest offshore windfarm. Murphy will lay over 350,000m of cable along a 38km route, onshore cabling of 220kV and 400kV, across three circuits. The work will encompass 25 joint bays, one transition joint bay and one substation connection. Cable will be laid in 1,200mm wide trenches with three direct buried cables and one 63mm diameter duct.

The cable route will cross agricultural farmland, roads, rail crossings, canal, river crossings and ditches, overhead and underground services. These will be crossed using either the open cut method or horizontal directional drilling (HDD). HDD will be used to cross approximately 50 assets along the route, minimising disruption to the local communities to keep the local infrastructure running as normal.

The onshore cable system being installed by Murphy will connect to the offshore cables at transition joint bays at Horseshoe Point, Lincolnshire. At the other end of the route, these three cable circuits, along with the fibre optic cables, will connect to the new onshore substation, next to the National Grid 400kV substation in Killingholme, northern Lincolnshire. Murphy will also connect two 400kV cables from the Dong substation to the National Grid substation.

Contracts manager for Murphy Dan Rice said: "We are currently carefully planning all aspects of this project, taking into account all the specifics, including for example the narrow roads within this rural part of Lincolnshire. With this in mind we are developing bespoke drum trailers, so we can ensure the project runs efficiently."

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