The lining types are expanded lining and universal tapered lining with an internal diameter of 3m External diameter 3.36m, 180mm thickness and 1,200mm length. The material will be C50/60 Concrete with steel fibre reinforcement (with the addition of polypropylene fibres).
Work is scheduled to start in March 2020. The project will see the construction of a 32.5km tunnel which will house electricity transmission cables some 30m underground. The new cables will replace three circuits currently in use. The project will eliminate the need to dig up the existing cable infrastructure, which is now more than 50-years-old and reaching the end of its life.
The first phase of the London Power Tunnels project was completed in 2018.
