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A handwritten notice about power failure is pasted outside a Metro station after Delhi Metro rail services were disrupted following power outage in New Delhi, India, Tuesday, July 31, 2012. India's energy crisis cascaded over half the country Tuesday when three of its regional grids collapsed, leaving more than 600 million people without government-supplied electricity in one of the world's biggest-ever blackouts.(AP Photo/ Manish Swarup)

Blackout in India

August 1, 2012

Half of India's 1.2 billion people were without power on July 31 as the grids covering a dozen states broke down. More than 600 million people were left without power in one of the world's biggest-ever blackouts.