India power crisis

The New Delhi railway station is seen after train services were disrupted following a power outage in New Delhi, Tuesday, July 31, 2012. Officials say the nation's northern and eastern power grids have failed, leaving about half the country without power. (AP Photo)

Streets are packed in heavy traffics following power outage and rains in the central part of New Delhi, Tuesday, July 31, 2012. India's energy crisis spread over half the country Tuesday when both its eastern and northern electricity grids collapsed, leaving 600 million people without power in one of the world's biggest ever blackouts. (AP Photo)

A traffic jam following power outage and rains at the Delhi Gurgaon road on the outskirts of New Delhi, Tuesday, July 31, 2012. India's energy crisis cascaded over half the country Tuesday when three of its regional grids collapsed, leaving 620 million people without government supplied electricity in one of the world's biggest ever blackouts. (AP Photo)

Stranded passengers wait inside a stalled local train following a power outage in Kolkata, Tuesday, July 31, 2012. India's energy crisis cascaded over half the country Tuesday when three of its regional grids collapsed, leaving 620 million people without government supplied electricity for several hours in, by far, the world's biggest ever blackout. (AP Photo)

Stranded passengers wait on a platform and some of them on rail tracks for the train services to resume following a power outage at Sealdah station in Kolkata, Tuesday, July 31, 2012. India's energy crisis cascaded over half the country Tuesday when three of its regional grids collapsed, leaving 620 million people without electricity. (AP Photo)

Trains stop in service at a railway station following a power outage in New Delhi, Tuesday, July 31, 2012. India's energy crisis cascaded over half the country Tuesday when three of its regional grids collapsed, leaving 620 million people without electricity. (AP Photo)

Stranded passengers wait for train services to resume at a railway station following a power outage in New Delhi, Tuesday, July 31, 2012. India's energy crisis cascaded over half the country Tuesday when three of its regional grids collapsed, leaving 620 million people without electricity. (AP Photo)

A building is seen dark following a power outage in Kolkata, Tuesday, July 31, 2012. India's energy crisis cascaded over half the country Tuesday when three of its regional grids collapsed, leaving 620 million people without electricity. (AP Photo)

A barber holding a candle, has a haircut for a customer at his shop in Kolkata, Tuesday, July 31, 2012. India's energy crisis cascaded over half the country Tuesday when three of its regional grids collapsed, leaving 620 million people without electricity. (AP Photo)

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, 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 electricity.(AP Photo)

Commuters wait outside a Metro station after Delhi Metro rail services were disrupted following power outage in New Delhi, 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 electricity.(AP Photo)

Commuters crowd a busy road outside a Metro station after Delhi Metro rail services were disrupted following power outage in New Delhi, 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 electricity.(AP Photo)