Electricity network modifications at Avonmouth

Work at Avonmouth

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

In March 2019, we started construction activity at Avonmouth to modify WPD’s substation and replace a section of overhead lines going north, out of the substation, with new underground cables.

This work was carried out by WPD and Balfour Beatty and was completed in September 2020, achieving an important milestone to remove seven pylons from Avonmouth and across the M49.


The construction compound near St Anthony’s Park and part of the haul road has been removed and the land reinstated. We’re keeping the temporary access and some of the haul road in place for when we build the new overhead line connection. They will be removed when all our work in this area is complete.

What comes next at Avonmouth

We are preparing to build the new overhead line from Sandford substation to Seabank substation (approximately 31.2 km). We’ve appointed Balfour Beatty as the principal contractor for this stage of work. They are carrying out surveys along the route and the findings will help us to plan the final designs for the overhead line, the temporary road entrances and the haul roads needed to access the new pylon locations.

Further information

We’ll provide more information on the construction programme for the new overhead line when it is available. We value and welcome your interest in the project. Please visit our contact us page and get in touch.