The three-hour blackouts that could be imposed to preserve energy supplies may take place on "really, really cold" winter days, National Grid has warned.
The power cuts could happen between 4pm and 7pm on weekdays if the weather becomes so cold that it starts affect the nation's gas supplies.
National Grid chief John Pettigrew spoke at the Financial Times's Energy Transition Summit on Monday, and warned that the power cuts are most likely to happen in January and February on the "deepest darkest evenings".
