Gas shortages during the winter months could end in planned three-hour power outages for households, according to the National Grid.
The warning comes after Prime Minister Liz Truss ruled out energy rationing during the Tory leadership contest and Downing Street insisted in August that Brits didn't need to cut their usage.
The PM was grilled on the grim warning on a visit to Prague where she urged European leaders to help "keep the lights on" this winter.
