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  • London Power Tunnels: 32 km of tunnels being constructed deep below the capital to be used to rewire London and help it to access the renewable energy of the future
    • Project description

    • In February 2011, National Grid embarked upon a seven-year project, to rewire the capital via deep underground tunnels, in order to meet increasing electricity demand and help London access the renewable energy of the future. 

      In total 32km of tunnels are being constructed between 20m and 60m deep below the road network.  The tunnels will carry high voltage (400kV) electricity cables and connect existing substations at the following locations:

      •  Hackney
      •  St John’s Wood
      •  Willesden
      •  Wimbledon

      By housing the cables in deep underground tunnels we will significantly reduce disruption to the local area as we are able to lay the cables and carry out maintenance work without digging up the road network.

      Intermediate shafts and headhouses are required at key points along the tunnel route to ensure the safety of our workforce during construction, provide access to the tunnel for maintenance work and to store ventilation equipment which is required to cool the cables and regulate the temperature inside the tunnel.
    • Latest update

    • We have recently completed construction of the tunnels from Willesden Substation to St John's Wood Substation and from our site at Eade Road in Haringey to St John's Wood Substation.

      In addition to the proposed new substation at 107-129 Seven Sisters Road, a new substation is being constructed at Kensal Green which received planning consent from the Royal Borough of Kensington and Chelsea in 2011.

    • Further information

    • More information on this project can be found on our dedicated London Power Tunnels project website.