Britain faces a greater risk of blackouts this winter after a fire on 15 September knocked out a cable importing electricity from France. National Grid’s electricity system operator (ESO) believes supply will meet demand, but has cut its forecast of buffer supply. Its officials are also warning of high costs for getting power generators to fire up at short notice to help balance the grid. Those costs are ultimately passed onto household bills - a further pressure when bills are climbing due to soaring wholesale costs of natural gas and electricity. The ESO warned in July that Britain should prepare for constrained power supplies over winter, with nuclear power plants shutting down and demand bouncing back from the pandemic. Its director said, ‘Our analysis shows that we expect sufficient margins over the winter and the system is within the reliability standard. Throughout the coming months the situation may change, as it does every winter.’