Coal-power generation has dipped to zero at points in Britain over the past few years but Friday is likely to mark the first continuous 24 hour period, National Grid said in a tweet.
The grid said it would only know for sure if it had achieved the feat by "22:51 on Friday".
However, its use has fallen in recent years, as plants closed or switched to burning biomass, and it accounted for just 9% of electricity generation in 2016 - down from 23% the year before.
If Britain goes without coal for the whole day, it is thought it will be the first time it has been without electricity from coal since the world's first centralised public coal-fired generator opened at Holborn Viaduct in London, in 1882.
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The government unveiled plans in November to phase-out coal, the most polluting fossil fuel, with the last coal-fired power station set to be forced to shut in 2025.
"Our energy is becoming cleaner and greener, with wind, solar and other renewables generating more of our electricity than ever before". The first electric coal cutting machine is also introduced.
Ben Caldecott, director of the sustainable finance programme at the University of Oxford said:"The first country to use coal for electricity is now on the cusp of being the first major economy to completely phase it out".
"We then had the dash for gas in the 1990s, with nuclear roughly contributing around 25%, and coal dropped below 50%".
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Fiddlers Ferry coal fired power station near Liverpool.
Ferris said Britain had become less reliant on coal thanks to the growth of renewables, declining electricity demand, carbon pricing increases and the ease of importing electricity from Europe.
Hannah Martin, from Greenpeace UK, called the potential new record "a watershed in the energy transition and said such and achievement would have been "unimaginable" a decade ago". Last year, that had tumbled to just 18 million tonnes and by 2025, the government will have phased out coal altogether.
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Demonstrators are calling for the resignation of President Nicolas Maduro amid the country's ongoing economic crisis. A national guardsman was killed south of the capital. "We're a peaceful people, but we're also armed", he said.