Brave engineers hang in mid-air from power cables as they complete the first phase of a £15m project.
The workers are pictured climbing up pylons and dangling from wires near Hart Village as they refurbish and replace sections of the overhead line.
The work, which is being carried out by National Grid, is the first phase in a project to revamp more than 15 miles of the existing cables between Hartlepool and Murton.
Grid bosses say the investment will keep the lines in good working order to ensure everyone has the power they need.
The overhead line, which was built in 1962, runs from National Grid’s sub-station at Hawthorn Pit, in Murton, and ends south-west of Hartlepool.
The project started in August and so far maintenance work has been carried out on 23 of 82 pylons.
Project manager Martin Bage said: “This investment is an important part of National Grid’s development of the local energy network, making sure everyone can continue to enjoy heat and light at the flick of a switch.”
While carrying out the work, engineers replace the wires on one side of the pylon at a time so electricity can continue to flow along the other side of the line.
National Grid is in contact with residents and businesses affected by work on the lines, which will be completed in August next year.
But electricity bosses say the work will not result in disruption to the electricity supply and advanced notice will be given of any road or footpath closures.