London, May 1, 2026, 15:22 BST
National Grid plc plans to roll out dynamic line rating tech across 585 km of transmission corridors in England and Wales, aiming to squeeze additional capacity from current power lines and potentially save up to £50 million for consumers over five years, according to the company.
Timing is crucial here. Britain’s grid faces real trouble shifting wind power south from the north, and the National Energy System Operator warns that balancing costs—currently around £2 billion a year—could soar to £8 billion by 2030. Thermal constraints, which cap flows to prevent cables from overheating, are expected to account for over 60% of those expenses.
The timing comes shortly after RIIO-3 kicks in—the five-year price-control window stretches from April 1, 2026, through March 31, 2031. RIIO stands for Revenues, Incentives, Innovation and Outputs, and it’s Ofgem’s model for determining how monopoly network operators collect revenue and finance projects.
Dynamic line rating, or DLR, relies on sensors and data crunching to figure out, moment by moment, just how much electricity an overhead line can move—factoring in line conditions and the weather, not just static estimates. According to the company, this method typically boosts safe capacity by about 8%.
Crews are set to tackle 345 km of overhead lines in the North East, plus another 240 km through Humber and East Anglia. The plan calls for 39 circuits—spanning over 900 km of National Grid’s network—to be fitted with the new technology. Most of the gear should be in place by 2028, with certain sensors to be installed by drone while the lines stay live.
Alice Delahunty, president of National Grid Electricity Transmission, said the technology is “unlocking greater capacity,” letting more renewable energy reach homes and businesses. LineVision CEO Vishal Kapadia noted the companies have “pioneered DLR in the UK and US.” Ampacimon’s Chief Product Officer Nabil Khouya mentioned drone-installed sensors and highlighted “reducing congestion on the grid.” Enlit World
Heimdall Power, named as one of the framework suppliers, said the rollout is set to begin this year on National Grid’s networks in the North East, Humber, and East Anglia. CEO Jørgen Festervoll pointed to DLR’s potential to “enable more power to flow where it’s needed” and “reducing costs for consumers.” Heimdallpower
National Grid’s been at this for years. The June 2025 launch with LineVision stretched across more than 275 km of overhead lines. They put the annual savings near £20 million, plus enough freed-up capacity to serve 75,000 homes every year.
National Grid Electricity Transmission runs the lines in England and Wales, while Scottish Power Transmission and SSEN Transmission split the job in Scotland, south and north. It’s a narrow field. Ofgem wants to see grid expansion ramp up—more than quadruple the pace of the last ten years—paid for, in the end, by consumers’ bills.
At 15:04 BST, National Grid stock traded at 1,312.6 pence in London, inching up just 0.03% for the session. Over the last 12 months, shares have climbed 22.5%, according to market data.
Savings remain uncertain. Ofgem’s broader £28 billion grid overhaul looks set to tack on £108 to household bills by 2031, and campaign groups are pushing back against the idea of handing network firms a blank cheque. National Grid, for its part, still needs to demonstrate that the quicker, lower-cost solution actually reduces bottleneck expenses—well before those larger transmission lines are in place.
