London, April 30, 2026, 12:05 BST
- National Grid plc is set to roll out dynamic line rating tech on an additional 585 km of transmission lines spanning England and Wales.
- The company estimates the rollout might trim as much as £50 million from consumer costs across five years, thanks to relief on grid bottlenecks.
- Britain is looking to reduce constraint costs and accelerate power flows out of renewable generation with this move.
National Grid plc on Thursday announced plans to roll out dynamic line rating tech over 585 kilometres of major north-to-south transmission lines in England and Wales. The company estimates the upgrade could cut consumer costs by as much as £50 million within five years.
Timing is crucial here. Britain is attempting to run more wind and solar through a grid that was built for a different era, and the resulting congestion isn’t cheap. Constraint costs—basically, payouts to generators who have to dial back because the system can’t handle their electricity—reached £1.34 billion for 2024-25. That figure could climb to almost £7 billion by 2030-31 unless something changes, according to NESO forecasts reported by Argus.
Dynamic line rating (DLR) taps sensors and analytics to figure out, on the fly, how much electricity an overhead line can handle— breaking away from static, cautious thresholds. According to The Energyst, this approach typically boosts a circuit’s capacity by about 8%.
Alice Delahunty, president of National Grid Electricity Transmission, said the company is “unlocking greater capacity on our existing network”—a move aimed at ramping up the flow of renewable energy to homes and businesses. theenergyst.com – Latest energy news
Crews are set to install new equipment across three network boundaries—345 km of overhead line in the North East, plus 240 km stretching through Humber and East Anglia. In total, the deployment will put the technology on 39 circuits and span over 900 km of National Grid’s transmission system, with a focus on the key north-to-south power corridors.
LineVision, Ampacimon, and Heimdall Power are set to handle the work under a five-year deal. “Critical grid intelligence,” is what LineVision CEO Vishal Kapadia says the group will deliver. Heimdall Power’s Jørgen Festervoll described DLR as “one of the fastest and most cost-effective ways to unlock capacity.” National Grid
The rollout comes amid a broader pattern of regulatory changes. Ofgem’s RIIO-3 price control, the system that determines allowed earnings and investment for monopoly network operators, kicks in April 1, 2026, running through March 31, 2031. It spans the electricity transmission, gas transmission, and gas distribution sectors.
National Grid signed onto the RIIO-T3 framework back in March, outlining plans for a minimum of £70 billion in total capital spending over five years, Alliance News reported. That figure includes £31 billion earmarked for UK electricity transmission and roughly £9 billion for UK electricity distribution.
This isn’t just a routine market-share battle. Britain’s transmission owners—SSE, Scottish Power, and National Grid—run regulated grids in separate regions, but now the whole sector’s feeling the heat. All three have committed to DLR rollouts as part of the government’s push to cut constraint costs, according to Argus.
National Grid shares climbed 1.77% to 1,302.40 pence on the London market, according to Investors Chronicle data, with pricing delayed by at least 20 minutes as of 11:49 BST.
There’s a snag here. The £50 million figure isn’t a realized gain—it’s a possible upside, and most of the upgrades won’t be finished until 2028. Plus, weather-based ratings only deliver if operators move fast on the information. System lags, outages, or hiccups with suppliers could all eat into that benefit.
The company’s course is set: wring extra capacity from existing wires—both overhead and buried—even as construction on Britain’s planned network expansion drags on. That approach saves money compared with holding out for new lines every time, though it can’t take their place entirely.
