Britain's electricity grid operator cancels call for more power after shortfall resolved

On Monday, September 28, 2026, Britain's electricity grid operator, the National Energy System Operator (Neso), issued an electricity margin notice early in the day, asking power generation companies to increase output for the evening peak period between 4pm and 7pm. The notice was a precautionary measure, not a warning of power cuts. Initially, a potential shortfall of 1,400 megawatts was forecast, but by midday it had been reduced to 104 megawatts as generators responded. Shortly after 4pm, Neso cancelled the notice, stating that the operating margin had been successfully restored and that the system was operating normally.