A power cut lasting up to an hour hit parts of Britain including areas of London on Friday evening, snarling rail services, knocking out traffic lights and disrupting an airport during the rush hour.
The National Grid said issues with two generators brought blackouts to London and the South east as well as the Midlands, the South West and Wales, the North East and North west of England too.
Passengers wait for news at Peterborough station during travel disruption on the East Coast mainline, after a large power cut has caused apocalyptic rush-hour scenes across England and Wales, with traffic lights down and trains coming to a standstill.
Harriet Jackson, 26, said there was an "apocalyptic" scene on Northcote Road, in Battersea, when traffic lights cut out and cars were not stopping.
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The electrical grid operator in northeast England reported multiple power failures across the region, which affected the airport and metro system of the region's biggest city, Newcastle.
No comment from National Grid was immediately available.
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.
Western Power said they were experiencing a "major incident".
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"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".
Merseyrail said all services on the Wirral Line around Liverpool are suspended.
Police were called to busy junctions to man the flow of traffic.
'All trains were stopped while our back-up signalling system started up'.
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Power suppliers said areas of London, the South East, Midlands and South West are without electricity. "While most of our signalling system has come back online and trains are running, there will be delays to journeys in these areas".