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The National Grid revealed that one of the 'winter contingency coal units' has had to be warmed up to provide a back-up supply if wind turbines do not generate enough energy.
The cold snap will hit England between this morning and 6pm tomorrow. Temperatures will hit bone-chilling lows at night, but are not expected to fall below mid-single figures in the day.
A cold weather warning has been issued for Sunday evening and early next week by the UK Health Security Agency.
Temperatures will plunge at night, but are not expected to fall below mid-single figures in the daytime during the chilly spell.
The Met Office and the agency say a cold snap will hit England between 6pm on Sunday and 6pm on Tuesday.