Landmarks across the UK switched off their lights last night in support of a global effort to tackle climate change.
Elizabeth Tower, which houses Big Ben in the Palace of Westminster, the Southbank Centre for arts on the banks of the River Thames and Buckingham Palace all went dark at 8.30pm for Earth Hour.
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Guillier conceded a "severe defeat" defeat to his supporters as the result came in.
The outage struck Hartfield-Jackson Atlanta International Airport at around 1pm local time, stopping all outgoing flights.
It will be a chilly day for many parts with the highest temperatures, about 10 Celsius (50F) in the far northwest.