Uxbridge Moor Substation

Murphy has commenced work at Uxbridge Moor, a new substation as part of a contract for National Grid Electricity Transmission (NGET). The site of Uxbridge Moor, bordering NGET’s existing Iver substation in Buckinghamshire, will connect new customers to the electricity network and help to meet the significant increase in demand for electricity to the west of London. The project represents one of the largest and most strategically important new substations on the National Grid network, supporting the long‑term growth of high‑demand users across the West London corridor.

With its wide-ranging in‑house expertise and direct delivery approach, Murphy will be carrying out the broad scope of works itself – including the construction of a new 400kV substation, a new 132kV substation, ancillary facilities, underground cabling and associated modification works to the 400kV overhead line network to the new 400kV substation. Connection to the new 132kV substation will be via 132kV underground cables. The scheme forms part of National Grid’s wider strategic investment programme to reinforce capacity and meet a surge in new connection requests, making it critical enabling infrastructure for the region.

The scope also consists of a new 1.2km raised access road off the A412 and other associated civil infrastructure, including a new road bridge crossing over River Alder Bourne. Given the site’s ground and water management sensitivities, the project requires enhanced drainage design and careful sequencing of civil works to ensure long‑term stability and compliance.

The substation design is gas insulated; this advanced technology will allow 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.