Unsupported browser

For a better experience, please update your browser to its latest version.

Your browser appears to have cookies disabled. For the best experience of this website, please enable cookies in your browser

We'll assume we have your consent to use cookies, for example so you won't need to log in each time you visit our site.
Learn more

Tunnelling completed on London’s electricity superhighway

National Grid has announced that tunnelling work on the 32km of tunnels on the London Power Tunnel project has been completed.

The new tunnel network has been developed to enable new high voltage electricity cables to be laid in order to meet future energy needs in London.

Tunnel boring machines (TBMs) for the scheme were launched by Skanska and Costain four years ago and work is already underway to install electricity cables in some sections of the network.

The final TBM breakthrough took place at Kensal Green.

The depths of the tunnels vary from 20m to 60m below ground and were excavated mainly within London Clay. Spoil from the tunnels has been used to carry out remediation at a number of former gasworks sites owned by National Grid in London.

Cables are already being laid in some of the first sections of tunnels and are expected to be powered up later this year. The complete network is expected to be operational by 2017.

Have your say

You must sign in to make a comment

Please remember that the submission of any material is governed by our Terms and Conditions and by submitting material you confirm your agreement to these Terms and Conditions. Links may be included in your comments but HTML is not permitted.