Brits have been warned the coronavirus crisis could result in blackouts due to staff shortages.
Electricity distributor UK Power Networks has urged homeowners to keep a torch and warm clothes handy just in case power cuts take place.
It also advised its priority customers, including the elderly, to keep a power bank in their home to charge up their phones.
However, the National Grid says the network is well-prepared in response to fears that there may be outages due to isolation rules and workers falling ill.
UK Power Networks contacted all its customers on the Priority Services Register, telling them what to do if a power cut happens.
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Their advice, seen by the Daily Telegraph, included keeping fridge and freezer doors shut so medicine stays cold.
Professor Keith Bell, a co-director of the UK Energy Research Centre, told the newspaper that energy usage in lockdown is about the same as it was on weekends.
He said pressure may mount as electrical workers fall sick or self-isolate.
Mr Ball added: “That will have an impact on the work force and where there are faults that occur we have to hope that we have enough people to respond to them. I guess that might become more difficult as the workforce starts to become more depleted.”
A spokesman for UK Power Networks told the Telegraph: "We are continuing to fix power cuts and maintain the electricity network to ensure its continued reliability.
"Across our networks, power supplies are 99.9 per cent reliable, and our dedicated teams are keeping the power flowing."
The boss of SP Energy Networks, which operates in Scotland, England and Wales, reportedly said staff sickness was also a worry.
Western Power Distribution is only carrying out essential works and will not be carrying out smaller tasks such as fixing street lights - unless the public is at risk.
