Thermal resistivity testing

PROJECT UPDATE - August 2021

If you’re visiting the Trans Pennine Trail (TPT) between Dunford Bridge and Penistone this week, you may see members of our team working along the trail. They’ll be carrying out what’s known as thermal resistivity testing.


Well, to be able to transform the skyline at Dunford Bridge and take down seven pylons, we need to keep the energy flowing efficiently along this route, providing electricity to Greater Manchester.

To do this, we’re replacing the pylons and overhead line with underground cables which will be buried underneath the Trans Pennine Trail.

What is thermal resistivity testing and what does the testing tell us?

The testing consists of one of our team using a special probe to sample the soil along the trail to find out its structure and properties. We can use this information to work out how far apart we need to space the cables to make sure they work at maximum efficiency.

We will access the TPT in an ordinary truck and will take samples every 30m or so to give us a good picture of the soil along the whole 1.5km route.