High voltage underground cables near Bridgwater now energised
On Horsey Levels north of Bridgwater, the Hinkley Connection team have been undertaking complex engineering works to modify the electricity network and connect in the southern-most T-pylons on the route.
A key part of these works, the undergrounding of a section of existing 400kV overhead electricity line, is now complete and energised.
Attached to a rare nine armed junction pylon, installation of the cable means that part of the existing transmission line between Shurton substation to Bridgwater substation is now undergrounded . By undergrounding the line, the team has made room for a section of the new overhead lines between Horsey and the Huntspill River to tie into the same junction tower. This section of overhead line establishes a new connection east to Melksham substation and features the most southerly T-pylon on the Hinkley Connection route.
For many reasons, including safety, overhead lines should not ideally cross each other. To ensure the new easterly branch to Melksham could be established, circuit 2 of the line between Shurton and Bridgwater had to be undergrounded. Work to underground the 400 meter cable began in February 2023, with all trenching and ducting work completed by July 2023.
Measuring the same as four Big Bens, stacked one on top of the other, the cable was tested successfully in January 2024. Final landscaping works and the last components to be installed were completed over the summer 2024 and site demobilisation was completed by the end of October 2024.
Bethan Jones , Project Manager at National Grid said:
“This piece of engineering allows us to connect the line to Melksham and provide greater resilience across the network. With the switching on of the transformer at Bridgwater Substation , the cable is now energised as it is part of the same circuit.
Work on the overhead lines is still ongoing in the area, so residents will still see activity in the area. These works should complete by Spring 2025.”
When completed, the new high voltage electricity line will connect six million homes and businesses to new sources of low-carbon, homegrown energy including from the new Hinkley Point C power station.
