Britain's Defence Secretary, Gavin Williamson, claimed that Russian president Vladimir Putin (above) could target interconnectors - linking power between countries - potentially leaving millions of homes without electricity.
Moscow has dismissed claims that it was planning to attack Britain.
The Russians actually believe that Gavin Williamson, the British Defence Secretary, had 'lost his grasp on reason.' The Defence Secretary had claimed that Russia was plotting to kill thousands of Britons in a cyber attack.
Major General Igor Konashenkov of the Russian defence ministry described the claims as laughable. He said the comments were like something of a Monty Python sketch.
The general told Russian news agency Tass:
'Gavin Williamson in his fiery crusade for military budget money appears to have lost his grasp on reason.
'His fears about Russia getting pictures of power plants and studying the routes of British pipelines are worthy of a comic plot or a Monty Python's Flying Circus sketch.'
Williamson and the PM
In November, Theresa May raised an alarm that Russia was meddling in elections and planting fake stories in the media in a bid to 'weaponise information' and sow discord in the West.