The High Voltage (HV) cable for the Walney Offshore Windfarm was laid in the highway from landfall at Thornton Gate to the substation at Hillhouse Industrial Estate (former ICI)
The length of the onshore cable route is 5km, split into seven x 75m sections.
Installing the cable for the Walney Offshore windfarm along Thornton Gate in Cleveleys
The majority of the cable was laid in an open cut trench, approximately 800mm wide x 1.4m deep, with seven, equally spaced larger excavations where the lengths of cable were joined.
Shelter over the top of one of the jointing bays
Joining two pieces of cable inside one of the jointing bay shelters
There were four teams of workmen, each team working in a different area along the route.
The trenches were barriered off and kept safe, and ‘Courtesy Boards’ were installed around the excavation with the contact details in the event that there were problems in your area.
All the trenches were filled with a concrete layer for strength and stability, with tarmac over the top to match the existing road surface.
There were some big obstacles in the path of the cable – for example the tram tracks and the railway line at Hillylaid in Thornton, and the culverts at Trunnah Road. It wasn’t practical or possible to dig straight through some of them so the cable was tunnelled underneath, what’s called ‘Directional Drilling’ in the photo below.
Route of the cable from shore to substation
Installing the cable for the Walney Offshore Windfarm along Trunnah Road in Thornton
Unfortunately, you can’t make an omelette without cracking an egg….
but disruption was kept to an absolute minimum, and we kept you well informed!