National Grid has ordered two coal plants to begin warming up in case electricity supplies to the UK are disrupted because of the cold weather.
The company says it had asked power station operator Drax to prepare two coal-fire units for use.
National Grid says that while the two plants will not necessarily be used, this measure should give the public confidence in Monday's energy supply.
The UK receives electricity via subsea cables from European countries including France, Norway, Belgium and the Netherlands.
National Grid says it has these tools for an additional contingency to operate the network as normal and the public should continue to use energy as normal.