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https://www.theconstructionindex.co.uk/assets/news_articles/2025/06/1748928986_murphy.jpgNational Grid Electricity Transmission (NGET) has awarded J Murphy & Sons a multimillion-pound contract to build a new substation at Uxbridge Moor, alongside the existing Iver substation in Buckinghamshire.
The new facility, the largest of its type in the UK, will connect new customers to the electricity network and help to meet an increase in demand for electricity to the west of London.
Murphy will be carrying out the broad scope of works itself, including the construction of a 400kV substation, a 132kV substation, ancillary facilities, underground cabling and associated modification works to the 400kV overhead line network to the new 400kV substation. Connection to the 132kV substation will be via 132kV underground cables.
The scope also includes a new 1.2km raised access road off the A412 and a new road bridge crossing the River Alder Bourne.

The substation design is gas insulated, allowing the team to reduce the footprint of the proposed site by around 70% compared to a traditional substation design, minimising the impact on the local area and the environment.
National Grid Electricity Transmission project director Laura Mulcahy said: “Our new Uxbridge Moor substation will provide vital access to power for data centres that are at the heart of Britain’s innovation and economic growth. It will enable new jobs and investment in Buckinghamshire, and will support the UK’s digital future.
“Alongside these significant benefits, we are working to keep the substation’s environmental impact to a minimum. By using the latest SF6-free gas-insulated switchgear, we’re reducing the size of this crucial site by around 70%, and ensuring its technology is sustainable and resilient long into the future.”
Liam Corr, Murphy’s managing director for energy, said: “Since 1951 Murphy has been a leading provider of innovative and integrated energy solutions. Today we support groundbreaking transmission and distribution projects across the four countries in which we work. We are proud to be delivering this project in the UK’s capital and building on our strong working relationship with National Grid to help to ensure energy security for decades to come.”
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