T-pylons – construction

Building T-pylons between Bridgwater substation and Loxton

In May 2020, we started work to build T-pylons between Bridgwater substation and a new cable sealing end compound (CSC) at Loxton, where it will join to the underground cables we’re building through the Mendip Hills.

We’ve appointed Balfour Beatty as the principal contractor for this stage of work and we expect to complete construction of the T-pylons by to be complete by the end of 2022.

We’re using T-pylons for most of the route – the first new design for pylons in this country for almost a century. It has a single pole and T-shaped cross arms which hold the wires in a diamond ‘earring’ shape. It is around 35 metres high; about a third shorter than traditional 400,000 volt steel lattice pylons. It also has a smaller footprint and will use less land.

We recognise that our construction activity impacts local communities. We are working with our contractor to limit that as much as possible.

Piling foundations

Starting in October 2020 for up to 12 months, an important part of our work involves driving concrete and steel piles into the ground to ensure we build solid foundations for the pylons.

You may hear noise and feel vibrations when we are carrying out piling. This will depend on how close you are to the site and the ground conditions and wind direction. We are sorry if this causes any disturbance.

To reduce disruption to local residents, we will not carry out any piling over the weekends and we will limit piling to between the hours of 8am and 5pm. The hydraulic hammer is the most silenced on the market and the piling rig has been designed to minimise noise and vibrations. We expect the piling at each site to be finished within 2 – 3 days.

This schedule shows where we are piling and when.

Working hours

Our agreed standard working hours are between 7am and 7pm Monday to Friday and 8am to 5pm on weekends.

Most work will be carried out on weekdays, although there may be occasions when we’ll need to work at weekends or outside the standard hours. Examples would be when we are working on a continuous process, if adverse weather or ground conditions cause delays, or to avoid traffic delays during the week. There are restrictions to this.

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