A joint venture between Siemens Mobility and Costain has won its bid to deliver high voltage power supply systems for the HS2 project throughout the 225km route from Birmingham to London. 

The contract, which will be formally signed shortly, is expected to be worth in the region of £300m to the joint venture, with optional contract extensions.

There is also a separate maintenance contract following the design and build phase that will operate for seven years worth around £32m for the joint venture. 

Costain has enjoyed a successful month of work winning on HS2 after also clinching a £400m sole supplier deal to deliver tunnel and lineside mechanical and electrical systems.

Work on the first elements of the M&E deal will start in the first quarter of 2025 and run for a seven-year period, with the option for additional contract extensions.

Alex Vaughan, CEO of Costain, said: “This contract marks the start of a new partnership with Siemens Mobility and its team of experts who share our values and ambitions.

“Providing a safe, reliable power system will be critical to the success of HS2, with rail electrification a crucial part of the UK’s decarbonisation plans.”