Nailsea to Tickenham

Current construction activity

Date fromDate toActivity
May 20212024Building and energising new T-pylons
20202024Removing existing pylons
2018OngoingRoadworks and traffic management
2018OngoingAccess to public footpaths and rights of way


Overview – Spring 2024

Overview – Autumn 2023 

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

68 new T-pylon structures have now been completed between Sandford and Portbury with the final wires being hung in March 2024. 

The final diamond shaped insulators were lifted into place on a pylon between Yatton and Kenn in July 2023

Teams will now work to test and commission the new line, including the new lattice pylons across the River Avon into Avonmouth, in preparation for energisation later this year. 

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

To make way for the new 400,000 volt connection, National Grid is removing 249 existing 132,000 volt lattice pylons, and overhead wires stretching 67 kilometres from the Somerset landscape.  We’ve taken down 248 of 249 lattice pylons, the one remaining lower voltage pylon in Portbury, will be removed in the coming months. 

We have begun reinstatement across the new connection route, removing construction access, temporary roads and work pads. You may expect to see more construction traffic on local roads and we will be in touch ahead of any traffic management impacts. 

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 six million homes and businesses.

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Nailsea to Tickenham timeline

Completed late 2021


Undergrounding the 132,000 volt overhead line between Nailsea and Portishead substation

This work has been completed. 

Work carried out:

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

  • Built temporary construction compounds.

  • Built an underground cable between Nailsea and Portishead substation.

  • Built a pylon to connect the existing overhead line at Nailsea to the new underground cable.

The new underground cable section was built as a direct result of feedback received during our consultation. Now operational, it will enable us to completely remove the existing 132,000 volt overhead line between Nailsea and Portishead substation that currently runs very close to people’s properties

Mid 2021 to mid 2024


Build new 400,000 volt overhead line

What we're doing:

  • In this area, to minimise disruption, we will be sharing temporary construction compounds and temporary entrances and access roads built for other elements of the build.

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

  • We will use T-pylons in this area.

Mid 2021 to mid 2024


Remove existing 132,000 volt overhead lines

What we're doing:

  • Removing approximately 9 km of existing overhead line between Nailsea and Portishead substation that currently runs very close to people’s properties. We are removing this as a direct result of feedback received during our consultation.

  • Removing existing overhead line from the A368 in Sandford to Avonmouth, which will make way for, and minimise the visual impact of, the new connection.