Puxton to Kenn

Current construction activity

Date from

Date to


May 2021


Building and energising new T-pylons

20202024Removing existing pylons



Roadworks and traffic management

2018OngoingAccess to public footpaths and rights of way


Overview – Summer 2023

National Grid is moving into the final stage for completing the north section of the Hinkley Connection route between Sandford and Seabank substations.   

  The 68 T-pylon structures between Sandford substation and Portbury were completed, with the final diamond shaped insulators lifted into place on a pylon between Yatton and Kenn in July 2023.  

The innovative T-pylons will soon join the new line of 27 lattice pylons erected between the River Avon and Seabank substation. The combined total of 95 new pylons will be energised by the end of 2024. Before then, the last section of conductors will be hung from the T-pylons between the west end of Nailsea and Tickenham.  

Using the T-pylon design, reduces the height of the new infrastructure by a third. At 35 metres high they are shorter than National Grid's traditional lattice transmission pylons and take up far less room on the land. 

To make way for the new connection route, we are removing 249 existing 132,000 volt lattice pylons and overhead wires stretching 67 kilometres from the Somerset landscape. 99 percent of the lattice pylons have now been removed, with the very last of the 249 pylons expected to be taken down by autumn 2023. 

Reinstatement of the land along the connection route is underway and will continue through to 2025. 

Thank you from everyone working on the project for your patience and understanding as we work to towards full completion of this project which will play such a key role in helping the UK meet its net zero ambitions by transmitting cleaner, homegrown, energy around the UK – enough to power 6 million homes and businesses. 


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Puxton to Kenn timeline

Early 2021 to mid 2023


Modifications to the existing 132,000 volt overhead line to Weston-super-Mare

What we are doing:

  • Building a temporary entrance and access road to allow construction traffic to enter site from the local highway. You can find more information on our construction information page.

  • Building a new connection from Sandford substation to the existing overhead line that goes to Weston-super-Mare. It will be made up of 700m of underground cable and nine new lattice pylons. This is to ensure local electricity supplies are maintained.

  • Removing 1.5 km of the existing overhead line to Weston-super-Mare that runs north-west from Sandford towards Puxton.


Early 2021 to mid 2024


Build a new 400,000 volt overhead line

What we are doing:

  • Building temporary entrances, crossing points and access roads to allow construction traffic to enter site from the local highway. You can find more information on our construction information page. 

  • Building a new overhead line from Sandford substation to Seabank substation (approximately 31.2 km).

  • We will use T-pylons in this area.

Early 2021 to mid 2024


Remove the existing 132,000 volt overhead line

What we are doing:

  • Removing existing overhead line from the A368 in Sandford to Avonmouth.