In your area

Find out what’s happening where using the links below or explore our interactive map.

Hinkley Point area

Current Construction Activity

Date From Date To Activity
February 2021 Ongoing

New pylons near Stogursey

June 2019 Ongoing

Shurton substation

Overview – Spring 2022

National Grid’s contractor, Morrison Energy Services, is continuing works to connect Hinkley Point C and the new Shurton substation to the electricity network.

With the first phase of new pylons completed in January 2022, the team are hanging the wires between the pylons in preparation for the new line to become operational from May 2022.

Our new substation at Shurton is close to completion. In March 2022, three series reactors were successfully delivered to the new site, bringing the substation a step closer to becoming operational from May 2022.

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.

Detail Map

Projects timeline

2018
Q1
Q2
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Q4
2019
Q1
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2020
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2021
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2022
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2023
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2024
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2025
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2026
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What we are doing:

  • Building a new substation within the boundary of the new Hinkley Point C power station complex, so we can connect the new power station to the electricity transmission network.

This was included in EDF Energy’s Development Consent Order which was approved by the Secretary of State in March 2013.

Expected start: Mid 2019
Expected completion: Mid 2023

What we are doing:

  • Building temporary entrances and access roads to allow construction traffic to enter site from the local highway. Click here for more details.
  • Modifying existing overhead lines in the Hinkley Point area so they connect to the new Shurton substation at Hinkley Point C Power Station.
  • Building a short connection from Shurton substation to the existing substation at Hinkley Point B.

Expected start: Early 2021
Expected finish: Late 2025

This is the middle of the three lines shown above.

What we are doing:

  • Changing the wires on the existing pylons to upgrade the operating voltage of the line from 275,000 volts to 400,000 volts.

Expected start: Mid 2022
Expected finish: Mid 2024

Puriton Ridge area

Current Construction Activity

Date From Date To Activity
October 2021 Summer 2022

Removing existing WPD pylons between Bridgwater and Sandford

May 2020 Late 2022

T-pylons between Bridgwater substation and Loxton

May 2020 Late 2022

Access to public footpaths and rights of way 

2018 Ongoing

Roadworks and traffic management

Overview – Spring 2022

Our contractor, Balfour Beatty, has completed building a section of the world’s first T-pylons that will help carry low carbon energy from Hinkley Point C and other sources to six million homes and businesses.

In early April 2022, the team finished building 48 of the new T-pylons and connected the wires along a section of the Hinkley connection route between Bridgwater and Loxton. This new milestone is a great engineering achievement ahead of energising the pylons in October 2022.

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

We recognise that our construction activity impacts local communities and work with our contractors to limit that as much as possible. We want to thank the communities in the areas in which we’re working for their patience and understanding as we continue our work to connect UK homes and businesses to low carbon energy and support the UK’s ambition to achieve net zero by 2050.

To reduce the visual impact of the new pylons, National Grid is removing 37 kilometres of existing 132,000 volt pylons owned by Western Power Distribution (WPD) between Bridgwater and Sandford.

This work began in October 2021; we’ll remove the remaining 80 pylons by summer 2022, leaving part of the Mendip Hills AONB pylon-free for the first time since the 1960s.

This work is part of the changes we’re making to WPD’s network to remove a total of 249 existing pylons and 67 kilometres of overhead line along the new connection route by 2025, that’ll see will see pylons that have stood in the landscape for a generation disappear.

Reinstatement along the southern section of the connection route will start in spring 2022 and continue through to late 2024.

Our community relations team is available 24 hours a day. You can also register to receive project updates direct to your inbox.

Detail Map

Projects timeline

2018
Q1
Q2
Q3
Q4
2019
Q1
Q2
Q3
Q4
2020
Q1
Q2
Q3
Q4
2021
Q1
Q2
Q3
Q4
2022
Q1
Q2
Q3
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2023
Q1
Q2
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2024
Q1
Q2
Q3
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2025
Q1
Q2
Q3
Q4
2026
Q1
Q2
Q3
Q4

What we are doing:

  • Building a new overhead line from the existing Hinkley to Melksham overhead line, which is north of Woolavington, northwards to a new cable sealing end (CSE) compound just south of the Mendip Hills. See Mendip Hills for further information about the CSE compound.
  • Building temporary entrances and access roads to allow construction traffic to enter site from the local highway. Click here for more details.
  • In this area, contractors will use the temporary construction compound built north of Tarnock.

We will use T-pylons in this area, with the exception of where the overhead line connects to the existing overhead line.

Expected start: Early 2020
Expected finish: Late 2022

What we are doing:

  • Removing Western Power Distribution’s existing overhead line from Bridgwater substation to the A368 in Sandford. This will make way for, and minimise the visual impact of the new overhead line.

Expected start: Mid 2021
Expected finish: Mid 2022

What we are doing:

  • We are upgrading the wires on the existing pylons.

Expected start: Mid 2022
Expected finish: Mid 2024

What we are doing:

  • Building a new overhead line between the existing Hinkley to Bridgwater overhead line on Horsey Level and the existing Hinkley to Melksham overhead line which is north of Woolavington.
  • Building temporary entrances and access roads to allow construction traffic to enter site from the local highway. Click here for more details.
  • In this area, contractors will use the temporary construction compound built north of Tarnock.

We will use T-pylons in this area, with the exception of where the overhead line connects to existing overhead lines. When complete, this will become the new Shurton to Melksham overhead line.

Expected start: Late 2022
Expected finish: Late 2024

What we are doing:

  • Installing new electrical equipment, which is required as part of the upgrading of the existing Hinkley to Bridgwater overhead line.
  • This work is being carried out within the existing substation boundary and does not require planning permission.

Expected start: Early 2023
Expected finish: Mid 2024

This is the point at which the new overhead line connects to the existing Hinkley to Bridgwater overhead line on Horsey Level.

What we are doing:

  • Building a temporary construction compound, and entrance and access road to allow construction traffic to enter site from the A39 Bath Road. Click here for more details.
  • Connecting the new overhead line to the existing Hinkley to Bridgwater overhead line on Horsey Level.
  • Removing a small section of the existing Hinkley to Bridgwater overhead line and replacing it with an underground cable. This will enable the overhead line to pass overhead.
  • Building two cable sealing end (CSE) compounds (approximately 34m by 30m) at either end of the underground cable to connect it to the existing overhead line.

Expected start: Mid 2023
Expected finish: Mid 2024

East Huntspill to Mendips

Current Construction Activity

Date From Date To Activity
October 2021 Summer 2022

Removing existing WPD pylons between Bridgewater and Sandford

May 2020 Late 2022

T-pylons between Bridgwater substation and Loxton

May 2020 Late 2022

Access to public footpaths and rights of way 

2018 Ongoing

Roadworks and traffic management

Overview – Spring 2022

Our contractor, Balfour Beatty, has completed building a section of the world’s first T-pylons that will help carry low carbon energy from Hinkley Point C and other sources to six million homes and businesses.

In early April 2022, the team finished building 48 of the new T-pylons and connected the wires along a section of the Hinkley connection route between Bridgwater and Loxton. This new milestone is a great engineering achievement ahead of energising the pylons in October 2022.

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

We recognise that our construction activity impacts local communities and work with our contractors to limit that as much as possible. We want to thank the communities in the areas in which we’re working for their patience and understanding as we continue our work to connect UK homes and businesses to low carbon energy and support the UK’s ambition to achieve net zero by 2050.

To reduce the visual impact of the new pylons, National Grid is removing 37 kilometres of existing 132,000 volt pylons owned by Western Power Distribution (WPD) between Bridgwater and Sandford.

This work began in October 2021; we’ll remove the remaining 80 pylons by summer 2022, leaving part of the Mendip Hills AONB pylon-free for the first time since the 1960s.

This work is part of the changes we’re making to WPD’s network to remove a total of 249 existing pylons and 67 kilometres of overhead line along the new connection route by 2025, that’ll see will see pylons that have stood in the landscape for a generation disappear.

Reinstatement along the southern section of the connection route will start in spring 2022 and continue through to late 2024.

Our community relations team is available 24 hours a day. You can also register to receive project updates direct to your inbox.

Detail Map

Projects timeline

2018
Q1
Q2
Q3
Q4
2019
Q1
Q2
Q3
Q4
2020
Q1
Q2
Q3
Q4
2021
Q1
Q2
Q3
Q4
2022
Q1
Q2
Q3
Q4
2023
Q1
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2024
Q1
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2025
Q1
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2026
Q1
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Q4

We are building two temporary construction compounds and a temporary entrance and access road off the A38, north of Tarnock, to allow construction traffic to enter the site from the local highway. Work will start on the access and compounds in 2019.

One of the compounds will includes site offices and internal and external storage facilities to support the work to build a 400,000 volt underground cable across the Mendip Hills Area of Outstanding Natural Beauty (AONB).

The other temporary site compound will be used for the construction of the 400,000 volt overhead line and removal of the existing 132,000 volt overhead line in the area.

Expected start: Early 2019

Expected finish: Mid 2024

 

What we are doing:

  • Building a new overhead line from the existing Hinkley to Melksham overhead line, which is north of Woolavington, northwards to a new cable sealing end (CSE) compound just south of the Mendip Hills. See Mendip Hills for further information about the CSE compound.

We will use T-pylons in this area, with the exception of where the overhead line connects to the existing overhead line.

Expected start: Early 2020
Expected finish: Late 2022

What we are doing:

  • Removing Western Power Distribution’s overhead line from Bridgwater substation to the A368 in Sandford. This will make way for, and minimise the visual impact of the new overhead line.

Expected start: Mid 2021
Expected finish: Mid 2022

Mendip Hills

Current Construction Activity

Date From Date To Activity
October 2021 Summer 2022

Removing existing WPD pylons between Bridgewater and Sandford

May 2020 Late 2022

T-pylons between Bridgwater substation and Loxton

May 2020 Late 2022

Access to public footpaths and rights of way 

April 2019 2024

Underground cables through the Mendips AONB

2018 Ongoing

Roadworks and traffic management

Overview – Spring 2022

National Grid’s contractor, Balfour Beatty, completed installing the high voltage 400kV cables under the Mendip Hills Area of Outstanding Natural Beauty (AONB) in December 2021.

A total of 102 kilometres of cable has been installed along the 8.5 kilometre route – the equal distance between Bridgwater and Gloucester.

Work to join and test the cables continues as we prepare to energise the 400kV cables later in 2022, with reinstatement along the route expected to be complete by 2024.

National Grid is removing 37 kilometres of existing 132,000 volt pylons owned by Western Power Distribution (WPD) between Bridgwater and Sandford. We removed the wires that run between the pylons and some of the existing pylons in October 2021; we’ll remove the remaining 80 pylons by summer 2022, leaving part of the Mendip Hills AONB pylon-free for the first time since the 1960s.

This work is part of the changes we’re making to WPD’s network to remove 67 kilometres of existing overhead line between Bridgwater and Avonmouth by 2025, that’ll see will see pylons that have stood in the landscape for a generation disappear.

We recognise that our construction activity impacts local communities and work with our contractors to limit that as much as possible. Our community relations team is available 24 hours a day. You can also register to receive project updates direct to your inbox.

Detail Map

Projects timeline

2018
Q1
Q2
Q3
Q4
2019
Q1
Q2
Q3
Q4
2020
Q1
Q2
Q3
Q4
2021
Q1
Q2
Q3
Q4
2022
Q1
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2023
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2024
Q1
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2025
Q1
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2026
Q1
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Q4

Work started in this area in April 2019. 

What we are doing:

  • Advance landscaping and planting around the location of the new cable sealing end (CSE) compound.
  • Building temporary entrances and access roads to allow construction traffic to enter site from the local highway. Click here for more details.
  • Installing a temporary site office and temporary construction compound north of Tarnock and up to four secondary temporary construction compounds along the route to minimise traffic movements on site. One of these secondary compounds will be located immediately south of the new CSE compound.
  • Constructing a new CSE compound east of the M5 motorway to the south of the Mendip Hills Area of Outstanding Natural Beauty (AONB) and the River Axe.
  • Laying 8.5 km of 400,000 volt underground cables from the CSE compound south of the Mendip Hills AONB northwards to the new Sandford substation.

Expected start: Early 2019
Expected finish: Early 2024

What we are doing:

  • Removing Western Power Distribution’s overhead line from Bridgwater Substation to the A368 in Sandford. This will make way for, and minimise the visual impact of the new overhead line.

Expected start: Mid 2021
Expected finish: Mid 2022

Sandford

Current Construction Activity

Date From Date To Activity
October 2021 Summer 2022

Removing existing WPD pylons between Bridgewater and Sandford

July 2021 Late 2023

Changing WPD’s existing overhead line to Weston-super-Mare

June 2021 Late 2024

Access to public footpaths and rights of way

May 2021 2024

Building new T-pylons

April 2020 Late 2023

Sandford substation

2018 Ongoing

Roadworks and traffic management

Overview – Spring 2022

We started work to build the new substation near Sandford with our contractor, Siemens, in April 2020.

The new substation stands mid-point along the Hinkley connection route and will connect low carbon energy from Hinkley Point C and other sources to the local distribution network when it’s completed and energised in late 2023.

In July 2021, we started work to make changes to Western Power Distribution’s (WPD) electricity lines to connect their local network into the new substation. This work includes building nine new lattice pylons north-west of the substation towards Puxton and diverting a short section of existing wood pole overhead line to the south of the substation.

During 2023, we’ll remove existing WPD lattice pylons to the north and south of the substation that’ll see 67 kilometres of WPD’s overhead line removed by the time the Hinkley Connection Project is completed in 2025.

We recognise that our construction activity impacts local communities and work with our contractors to limit that as much as possible. Our community relations team is available 24 hours a day. You can also register to receive project updates direct to your inbox.

Detail Map

Projects timeline

2018
Q1
Q2
Q3
Q4
2019
Q1
Q2
Q3
Q4
2020
Q1
Q2
Q3
Q4
2021
Q1
Q2
Q3
Q4
2022
Q1
Q2
Q3
Q4
2023
Q1
Q2
Q3
Q4
2024
Q1
Q2
Q3
Q4
2025
Q1
Q2
Q3
Q4
2026
Q1
Q2
Q3
Q4

What we are doing:

  • Advance planting and landscaping.
  • Installing a temporary construction compound adjacent to the site of the new substation.
  • Building a new substation, just north of the A368, in order to maintain local electricity supplies in the area.

Work started: April 2020
Expected finish: Late 2023

What we are doing:

  • Building temporary entrances and access roads to allow construction traffic to enter site from the local highway. Click here for more details.
  • Installing a temporary construction compound north of Sandford substation.
  • 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 near Puxton.

This work will be done by Western Power Distribution.

Expected start: Early 2021
Expected finish: Mid 2023

What we are doing:

  • Building temporary entrances and access roads to allow construction traffic to enter site from the local highway. Click here for more details.
  • Building a new overhead line from Sandford substation to Seabank substation (approximately 31.2 km).

We will use T-pylons in this area.

Expected start: Early 2021
Expected finish: Mid 2025

What we are doing:

  • Removing Western Power Distribution’s overhead line from the A368 in Sandford to Avonmouth.

Expected start: Early 2021
Expected finish: Mid 2025

What we are doing:

  • Building a new overhead line using wooden poles (285m) from Sandford substation to the existing overhead line that goes to Churchill, to ensure local electricity supplies are maintained.
  • Removing approximately 550m of the existing overhead (lattice pylons) to the south Sandford substation.

This work will be done by Western Power Distribution.

Expected start: Late 2021
Expected finish: Late 2023.

Churchill

Current Construction Activity

Date From Date To Activity
No current activity information available

Work at Churchill substation is complete.

We are working with Western Power Distribution (WPD) to make significant changes to its local electricity network by removing 67 kilometres of existing overhead line and pylons.

WPD and its contractor completed work to upgrade the existing substation at Churchill and to modify the electricity network to the east of the substation in July 2020, hitting a milestone in our programme to build the Hinkley Connection Project.

The upgrades reinforce the local electricity network in the South West region before we remove the existing WPD lattice pylons from Bridgwater to Avonmouth.

Detail Map

Projects timeline

2018
Q1
Q2
Q3
Q4
2019
Q1
Q2
Q3
Q4
2020
Q1
Q2
Q3
Q4
2021
Q1
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2022
Q1
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2023
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2024
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2025
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2026
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Work at Churchill substation was completed by Western Power Distribution (WPD) in July 2020. 

Work carried out:

  • Upgraded the existing substation and installed new electrical equipment to enable the connection of the overhead lines to the east of the substation.

 

This work was completed by WPD in July 2020.

Work carried out:

  • Connected Churchill substation to the existing overhead line to the east.
  • Installed a small section of underground cable and replaced an existing pylon with a new cable sealing end (CSE) pylon to join the existing overhead line to the new underground cable.
  • Removed the temporary construction compound, haul road and entrance, and reinstated the land.

The work at Churchill will maintain and reinforce the security of the electricity network in the South West, following the removal of the 132,000 volt overhead line (owned by WPD) from Bridgwater to Avonmouth.  

Puxton to Kenn

Current Construction Activity

Date From Date To Activity
July 2021 Late 2023

Changing WPD’s existing overhead line to Weston-super-Mare

June 2021 Late 2024

Access to public footpaths and rights of way

May 2021 2024

Building new T-pylons

2018 Ongoing

Roadworks and traffic management

Overview – Spring 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 Portishead, and new traditional lattice pylons through Avonmouth to make the final connection into Seabank substation. We expect all pylons to constructed and the wires in place by 2023.

During 2023, we’ll remove existing WPD lattice pylons to the north and south of Sandford substation, bringing us a step closer to removing 67 kilometres of WPD’s overhead line by the time the Hinkley Connection Project is completed in 2025.

During 2023, we’ll remove existing WPD lattice pylons to the north and south of the substation that’ll see 67 kilometres of WPD’s overhead line removed by the time the Hinkley Connection Project is completed in 2025.

We recognise that our construction activity impacts local communities and work with our contractors to limit that as much as possible. Our community relations team is available 24 hours a day. You can also register to receive project updates direct to your inbox.

Detail Map

Projects timeline

2018
Q1
Q2
Q3
Q4
2019
Q1
Q2
Q3
Q4
2020
Q1
Q2
Q3
Q4
2021
Q1
Q2
Q3
Q4
2022
Q1
Q2
Q3
Q4
2023
Q1
Q2
Q3
Q4
2024
Q1
Q2
Q3
Q4
2025
Q1
Q2
Q3
Q4
2026
Q1
Q2
Q3
Q4

What we are doing:

  • Building a temporary entrance and access road to allow construction traffic to enter site from the local highway. Click here for more details.
  • 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.

This work will be done by Western Power Distribution.

Expected start: Early 2021
Expected finish: Mid 2023

 

What we are doing:

  • Building temporary entrances, crossing points and access roads to allow construction traffic to enter site from the local highway. Click here for more details.
  • Building a new overhead line from Sandford substation to Seabank substation (approximately 31.2 km).

We will use T-pylons in this area.

Expected start: Early 2021
Expected finish: Mid 2025

 

What we are doing:

  • Removing Western Power Distribution’s overhead line from the A368 in Sandford to Avonmouth.

Expected start: Early 2021
Expected finish: Mid 2025

 

Nailsea to Tickenham

Current Construction Activity

Date From Date To Activity
June 2021 Late 2024

Access to public footpaths and rights of way

May 2021 2024

Building new T-pylons

2018 Ongoing

Roadworks and traffic management

Overview – Spring 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 Portishead, and new traditional lattice pylons through Avonmouth to make the final connection into Seabank substation. We expect all pylons to constructed and the wires in place by 2023.

Our contractor, J Murphy and Sons, energised the new 132,000 volt underground cables between the west end of Nailsea and Portishead substation in September 2021. The new underground cables are a direct replacement of the Western Power Distribution’s (WPD) pylons that we’ve removed from nearby Nailsea homes and gardens as part of our work to help reduce the visual impact of the new T-pylons being built to the west of Nailsea.

During 2023, we’ll remove the second line of existing WPD lattice pylons that runs from Sandford to Avonmouth, that’ll see 67 kilometres of WPD’s overhead line removed by the time the Hinkley Connection Project is completed in 2025.

We recognise that our construction activity impacts local communities and work with our contractors to limit that as much as possible. Our community relations team is available 24 hours a day. You can also register to receive project updates direct to your inbox.

Detail Map

Projects timeline

2018
Q1
Q2
Q3
Q4
2019
Q1
Q2
Q3
Q4
2020
Q1
Q2
Q3
Q4
2021
Q1
Q2
Q3
Q4
2022
Q1
Q2
Q3
Q4
2023
Q1
Q2
Q3
Q4
2024
Q1
Q2
Q3
Q4
2025
Q1
Q2
Q3
Q4
2026
Q1
Q2
Q3
Q4

What we are doing:

  • Building temporary entrances and access roads to allow construction traffic to enter site from the local highway. Click here for more details.
  • 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 and when it is 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

Work started: Early 2020
Expected finish: Late 2021

What we are 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.

Expected start: Mid 2021
Expected finish: Mid 2025.

What we are 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.

Expected start: Mid 2021
Expected finish: Mid 2025

Tickenham to Portishead

Current Construction Activity

Date From Date To Activity
June 2021 Late 2024

Access to public footpaths and rights of way

May 2021 2024

Building new T-pylons

2018 2025

Work in and around Portbury Wharf Nature Reserve

2018 Ongoing

Roadworks and traffic management

Overview – Spring 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 Portishead, and new traditional lattice pylons through Avonmouth to make the final connection into Seabank substation. We expect all pylons to constructed and the wires in place by 2023.

In April 2022, our contractors returned to Portbury Wharf Nature Reserve to re-start the work needed to install underground cables that’ll replace WPD’s existing pylons to the east of their substation, and to build two of the new T-pylons in the reserve itself.  Our main construction activities in the nature reserve are timed to avoid disturbance to wintering birds and other wildlife.

Our contractor, J Murphy and Sons, energised the new 132,000 volt underground cables between the west end of Nailsea and Portishead substation in September 2021. The new underground cables are a direct replacement of the Western Power Distribution’s (WPD) pylons that we’ve removed as part of our work to help reduce the visual impact of the new 400kV connection route.

During 2023, we’ll remove the second line of existing WPD lattice pylons that runs from Sandford to Avonmouth, that’ll see 67 kilometres of WPD’s overhead line removed by the time the Hinkley Connection Project is completed in 2025.

We recognise that our construction activity impacts local communities and work with our contractors to limit that as much as possible. Our community relations team is available 24 hours a day. You can also register to receive project updates direct to your inbox.

Detail Map

Projects timeline

2018
Q1
Q2
Q3
Q4
2019
Q1
Q2
Q3
Q4
2020
Q1
Q2
Q3
Q4
2021
Q1
Q2
Q3
Q4
2022
Q1
Q2
Q3
Q4
2023
Q1
Q2
Q3
Q4
2024
Q1
Q2
Q3
Q4
2025
Q1
Q2
Q3
Q4
2026
Q1
Q2
Q3
Q4

What we are doing:

  • Building temporary entrances and access roads to allow construction traffic to enter site from the local highway. Click here for more details.
  • Building temporary construction compounds.
  • Building a 132,000 volt underground cable between Nailsea and Portishead Substation.
  • Building a new CSE pylon to connect the existing overhead line at Nailsea to the new underground cables.

This new underground cable section is being built as a direct result of feedback received during our consultation. It will enable us to completely remove the existing 132,000 volt overhead line that currently runs very close to people’s properties.

Work started: Early 2020
Expected finish: Mid 2021

 

What we are 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 400,000 volt overhead line from Sandford Substation to Seabank Substation (approximately 31.2km).

We will use T-pylons in this area.

Expected start: Mid 2021
Expected finish: Mid 2025

 

What we are 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.

Expected start: Mid 2021
Expected finish: Mid 2025

 

What we are doing:

  • Making changes to the inside of Portishead Substation to enable the connection of the new 132,000 volt underground cable from Nailsea.
  • Building a temporary construction compound to the east of the substation.
  • Building temporary entrances and access roads to allow construction traffic to enter the undergrounding site from the local highway. Click here for more details.
  • Removing a section of 132,000 volt overhead line to the east of the substation and replacing it with underground cable. This will enable the 400,000 volt overhead line to pass safely overhead.
  • Installing a Cable Sealing End (CSE) pylon to connect the new underground cable to the existing overhead line.

This work will be done on our behalf by WPD.

Expected start: Early 2021
Expected finish: Mid 2025

 

Avonmouth

Current Construction Activity

Date From Date To Activity
February 2022 Late 2025

Seabank substation and nearby pylons at Crooks Marsh

June 2021 Late 2024

Access to public footpaths and rights of way

May 2021 2024

Building new pylons

2018 Ongoing

Roadworks and traffic management

Overview – Spring 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 Portishead, and new traditional lattice pylons through Avonmouth to make the final connection into Seabank substation. We expect all pylons to constructed and the wires in place by 2023.

As part of the Hinkley Connection Project, we’re working in partnership with Western Power Distribution (WPD) to make changes to their local electricity distribution network.

In February, our contractor, J Murphy and Sons, started work to make changes within WPD’s substation at Seabank, and to replace nearby pylons at Crooks March with new underground cables.

We recognise that our construction activity impacts local communities and work with our contractors to limit that as much as possible. Our community relations team is available 24 hours a day. You can also register to receive project updates direct to your inbox.

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.

Detail Map

Projects timeline

2018
Q1
Q2
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Q4
2019
Q1
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Q3
Q4
2020
Q1
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Q4
2021
Q1
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2022
Q1
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2023
Q1
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2024
Q1
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2025
Q1
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2026
Q1
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Q4

This was carried out by Western Power Distribution (WPD) and was completed in September 2020

Work carried out:

  • Replaced a small section of overhead line to the north of the substation with underground cables.
  • Constructed a new cable sealing end (CSE) pylon to connect the underground cables to the overhead line.
  • Changes inside Avonmouth substation to enable the connection of the new underground cables.
  • Reinstatement work including removal of the temporary construction compound and part of the haul road.

What we are doing:

  • Building a temporary construction compound and temporary entrances and access roads to allow construction traffic to enter the undergrounding site from the local highway.
  • Undergrounding a small section of the three existing overhead lines at Seabank. This will enable the new overhead line to pass safely overhead.
  • Building three pylons to connect the existing overhead lines to underground cables.
  • Modifying Seabank substation to enable the connection of the new underground cables.
  • Removing the existing overhead lines that are no longer needed in this area.

This work will be done by Western Power Distribution.

Expected start: To be confirmed
Expected finish: To be confirmed

What we are doing:

  • Building temporary entrances and access roads to allow construction traffic to enter site from the local highway.
  • Building a new overhead line from Sandford substation to Seabank substation (approximately 31.2 km).

In this area, we will use a mix of steel lattice pylons and T-pylons.

Expected start: Mid 2021
Expected finish: Mid 2025

What we are doing:

  • Removing Western Power Distribution’s overhead line from the A368 in Sandford to Avonmouth substation, which will make way for, and minimise the visual impact of, the new connection.
  • Removing a small section of the existing overhead line to the east of Avonmouth substation.

Expected start: Mid 2021
Expected finish: Mid 2025

What we are doing:

  • Extending the existing substation to enable the connection of the new overhead line.
  • Modifying the existing site access road.
  • Removing unnecessary electrical equipment.
  • Installing a perimeter flood defence wall with flood gates around the substation to help guard against tidal flood risk.

Expected start: To be confirmed
Expected finish: To be confirmed