National Grid pylon diversion works in the Colne Valley
Work item: HS2 National Grid Colne Valley
Work Item Summary
- Project Phase
- Phase 1
- Region
- Hillingdon
- Location
- Harefield, Harvil Road
- Contractor
- National Grid
- Type of works
- Utility works / surveys
- Estimated Start Date
- 05/10/2020
- Estimated End Date
- 31/05/2021
What we are doing
What are we doing and why?
National Grid is legally required to modify an overhead power line in Colne Valley for HS2 Ltd to allow for the build and operation of the new railway. We’re rerouting and raising the height of a line of electricity pylons on land now in HS2’s possession which the railway will pass under.
To achieve safety clearance five existing pylons, conveying a 275kV high voltage overhead line across Denham and Hillingdon, will be dismantled and the ground around each of them reinstated. Six taller pylons with support foundations will be built in new locations, diverting the line across a lower section of HS2 at a suitable crossing point. The overhead line will be diverted onto these new pylons and connected back up to the existing network.
The work is being done by National Grid and our contractor Babcock. The power line will remain the property of National Grid and we’ll be responsible for its future maintenance too.
Our overhead power line diversion work continues until Winter 2021 however the date is subject to change to fit with the activities of other HS2 contractors. National Grid will return to the area at a later date in HS2’s development to construct a Grid Supply Point (GSP) substation connection to power the railway.
Where is work happening?
This work is on both the east and west sides of the Grand Union Canal; near Skip Lane, Dews Lane, Harvil Road, Denham Country Park and the golf course. During the works there will be shared access along Skip Lane between National Grid and existing users. We’re working closely with HS2 and its stakeholders to maintain access routes for specific user groups while we work. Once complete the new section of overhead wire will connect into the existing line at either end.
During the main works in summer 2021 there will be temporary traffic management and road closures of a short duration to install and then remove scaffolding and netting.
For more information about these works please visit the HS2 in Hillingdon community website.
Download information relating to these works
If you have a question about HS2 or our works, please contact our HS2 Helpdesk team on 08081 434 434 or email [email protected]