Nailsea to Tickenham

Current construction activity

Date from

Date to


June 2021

Late 2024

Access to public footpaths and rights of way

May 2021


Building new T-pylons

January 2020

September 2021

Underground cables



Roadworks and traffic management


Overview – Summer 2022

In May 2021, National Grid started work to build the northern section of the new 400,000 volt overhead connection between Sandford and Seabank substations. We’re using T-pylons for part of the route between Sandford and Portbury, and new traditional lattice pylons through Avonmouth to make the final connection into Seabank substation.

In July 2022, our contractor Balfour Beatty started erecting new lattice pylons in Avonmouth. In early Autumn 2022, work will start to build 68 new T-pylons between Sandford and Portbury.

We expect T-pylon components to be delivered to the working areas, with erection of the new pylons to start from September 2022. All pylons will be constructed with the wires in place by 2023.

By using the innovative T-pylon design, the height of the new 400,000 volt infrastructure is being reduced by a third compared to an equivalent 400,000 volt lattice pylon (35 metres compared to 48 metres). The base of the T-pylons also requires less land meaning that their footprint on the ground is significantly reduced.

To make way for the new 400,000 volt connection, National Grid is removing 67 kilometres of existing 132,000 volt overhead wires and pylons – 249 in total from the Somerset landscape.

We removed a line of 132,000 volt pylons between Nailsea and Portishead in 2021. Work to remove 37 kilometres of pylons between Bridgwater and Sandford is underway. During 2023, we’ll remove the line of existing lattice pylons that runs from Sandford to Avonmouth.

Thank you from everyone working on the project for your patience as we continue our work to deliver electricity safely, efficiently, and reliably, and support the UK’s ambition to achieve net zero by 2050.

Contact our community relations team to register for project updates direct to your inbox.

Take a look at our detailed map

Nailsea to Tickenham timeline

Early 2020 to late 2021


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

What we're doing:

  • Building 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.

  • Building temporary construction compounds.

  • Building a underground cable between Nailsea and Portishead substation.

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

The new underground cable section is being built as a direct result of feedback received during our consultation. When it's 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 2025


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 2025


Remove existing 132,000 volt overhead lines

What we're doing:

  • Removing approximately 9 km of Western Power Distribution’s (WPDs) 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 WPDs overhead line from the A368 in Sandford to Avonmouth, which will make way for, and minimise the visual impact of, the new connection.