The power cut has reportedly impacted on rail services, airports, London Underground and traffic lights.
Almost 1 million customers in London and other parts of England were left without power Friday when a failure hit two power generators on the National Grid, officials say.
Trains ground to a halt and traffic lights were knocked out after a suspected failure of the National Grid left a large area of London and the South East without power, creating transport mayhem during rush hour.
UK Power Networks, who control power lines for London and the South East, and Western Power Distribution in Midlands, the South West and Wales both confirmed widespread outages.
It later said: "90 percent of customers are now restored and we are working hard to restore the remaining customers as soon as possible".
The UK is experiencing major power failures, with trains, airports and traffic lights having all been affected, the BBC reports. They said the issue was "now resolved". "We are sorry for the inconvenience this is causing".
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No comment from National Grid was immediately available.
Police were called to busy junctions to man the flow of traffic.
This has prevented our trains between Farringdon and Bedford from being able to take power and as a result, most of our trains are now at a stand.
There were power outages reported at Newcastle airport and in Cheshire, police tweeted they were aware of an outage in the Ellesmere Port area, including in Little Sutton and Great Sutton.
People in numerous affected areas said the power came back on within 30 to 40 minutes.