Boris Johnson said: It's been the most incredible epoch in the history of cycling that any of us can remember; and I am absolutely delighted that the world’s greatest cycling race is coming to the capital.
People will see London framed by shooting velocipedes for what will be a fantastic spectacle of sport. I am going to be in the crowd and I hope thousands more will too.”
Click here for detailed map of Tour de France route
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Mayor of London Sadiq Khan is backing the scheme.
A spokesperson said the lightning strikes had left the "aircraft fuelling system unavailable."
Nearly 1,000 properties have been left without power, and road users have been warned of potentially hazardous conditions.