Transport for London (TfL) has published a list of 17 contractors that will complete a £250 million upgrade of electrical systems on the London Underground network.
The two eight-year power upgrade frameworks will cover the design, installation and commissioning of power systems across the network.
Work is well underway on the Sub-Surface Railway power upgrade and there are plans for further upgrades on the Piccadilly line.
David Hughes, director of major programmes sponsorship for LU, said: “We’ve embarked on the biggest programme of Tube modernisation ever seen.
“To do that we need to work with suppliers who can bring experience and flexibility to the task in hand, and who understand our vision to improve services for customers while providing a reliable service with as little disruption as possible.”