The project - which begins in June 2022 and is scheduled to finish in June 2025 - will see UK Power Networks Services complete the design and construction works to upgrade several key electrical substations, and the installation of new electrical infrastructure, electrical control systems, and cables along key parts of the line. The initial framework contract runs for six years, with potential for two more.

All this will increase electrical capacity to allow Transport for London (TfL) to launch a new fleet of air-conditioned modern trains with improved reliability, efficiency, and accessibility for passengers. Overall, the line upgrade will allow for a 23% uplift in peak capacity, with a train running on the line every 135 seconds at the busiest times from 2027.

The announcement extends UK Power Networks Services’ longstanding portfolio on the London Underground. The infrastructure specialists have previously worked on several initiatives, including a major redevelopment at Liverpool Street as part of the Crossrail project, and 16 substation upgrades along the Metropolitan, Circle, Hammersmith & City, and District lines.

The high voltage electrical upgrades will take place above and below ground at 21 electricity substations, with planned works at Cobourg Street, Manor House and Mansell Street. Electrical infrastructure benefits include the installation of new transformers, SCADA cabinets, an upgrade of the line’s cable network, and a host of structural improvements. Upgrades will be phased to minimise disruption for passengers, with the line scheduled to stay open throughout the project.

Philip Heathcote, head of markets at UK Power Networks Services, said:

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Image courtesy of Transport for London