World's biggest blackout

Stranded passengers wait for train services to resume following a power outage in New Delhi, India, July 31, 2012. India's energy crisis cascaded over half the country 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. Hundreds of trains stalled across the country and traffic lights went out, causing widespread traffic jams in New Delhi.

Stranded passengers, seen through the glass window, wait for the train services to resume following a power outage at a railway station in New Delhi, India, July 31, 2012.

A traffic jam following power outage and rains in the central part of New Delhi, India, July 31, 2012.

Indian stranded passengers wait for the train services to resume at a railway station following a power outage in New Delhi, India, July 31, 2012.

The New Delhi railway station is seen after train services were disrupted following a power outage in New Delhi, India, July 31, 2012.

A young Indian girl looks out from a stalled train window as passengers are stranded following a power outage in New Delhi, India, July 31, 2012.

Indian stranded passengers sit on a railway platform as they wait for the train services to resume following a power outage in New Delhi, India, July 31, 2012.

A building is seen dark following a power outage in Kolkata, India, July 31, 2012.

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, July 31, 2012.

Indian stranded passengers stand near empty railway tracks as they wait for train services to resume at a railway station in New Delhi, India, July 31, 2012.

Commuters walk on empty railway tracks at the New Delhi railway station following a power outage in New Delhi, India, July 31, 2012.

Indian stranded passengers wait near empty railway tracks for train services to resume at a railway station in New Delhi, India, July 31, 2012.

An Indian barber holding a candle, has a haircut for a customer at his shop in Kolkata, India, July 31, 2012.

Indian stranded passengers are seen walking on empty railway tracks at a railway station in New Delhi, India, July 31, 2012.

An Indian man climbs the stars holding a candle following a power outage in Kolkata, India, July 31, 2012.

Indian commuters ride on a dark street in Kolkata, India, July 31, 2012.

A stranded Indian train passenger rests inside a railway coach as he waits for the train service to resume following a power outage in Kolkata, India, July 31, 2012.

Commuters wait in line at a Metro station after Delhi Metro rail services were disrupted following power outage in New Delhi, India, July 31, 2012.

Commuters stand on a busy road outside a Metro station after Delhi Metro rail services were disrupted following power outage in New Delhi, India, July 31, 2012.

Commuters wait outside a Metro station after Delhi Metro rail services were disrupted following power outage in New Delhi, India, July 31, 2012.

Indian stranded passengers wait inside a stalled train as they wait for the services to resume after a power outage in New Delhi, India, July 31, 2012.

A building is seen dark following a power outage in Kolkata, India, July 31, 2012.

Pigeons sit on electricity wires along a Metro line after Delhi Metro rail services were disrupted following a power outage in New Delhi, India, July 31, 2012.

Stranded passengers wait on a railway tracks for the train services to resume following a power outage at Sealdah station in Kolkata, India, July 31, 2012.

An Indian paramilitary force soldier stands guard as commuters wait outside Rajiv Chowk underground metro station after Delhi Metro rail services were disrupted following power outage in New Delhi, India, July 31, 2012.

An Indian man watches as he and others wait inside a stalled train for its services to resume following a power outage in New Delhi, India, July 31, 2012.

An Indian barber has a haircut for a customer in candle light at his shop in Kolkata, India, July 31, 2012.

Indian stranded passengers wait on a platform for the train services to resume following a power outage at Sealdah station in Kolkata, India, July 31, 2012.

Indian stranded passengers wait inside a stalled local train following a power outage in Kolkata, India, July 31, 2012.

Indian passengers sit inside a stalled train as they wait for its services to resume following a power outage in New Delhi, India, July 31, 2012.

Stranded passenger sit on railway tracks near a stalled train following a power outage near Nani village in Allahabad, India, July 31, 2012.

Indian people walk past an electric generator at a market in New Delhi, India, July 31, 2012.

Commuters wait for buses outside a Metro station after Delhi Metro rail services were disrupted following power outage in New Delhi, India, July 31, 2012.

An Indian shopkeeper fixes an electric generator at his shop in New Delhi, India, July 31, 2012.

Commuters crowd a busy road outside a Metro station after Delhi Metro rail services were disrupted following power outage in New Delhi, India, July 31, 2012.

A traffic jam following power outage and rains in New Delhi, India, July 31, 2012.

Security personnel stand behind a closed entrance of a Metro station after Delhi Metro rail services were disrupted following power outage in New Delhi, India, July 31, 2012.

Indian laborers sleep on railway platforms at the New Delhi railway station following a power outage in New Delhi, India, July 31, 2012.

Indian stranded passengers sit on a railway platform as they wait for the train services to resume following a power outage in New Delhi, India, July 31, 2012.

Indian 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, India, July 31, 2012.

Indian stranded passengers wait for train services to resume at a railway station following a power outage in New Delhi, India, July 31, 2012.

Streets are packed in heavy traffics following power outage and rains in the central part of New Delhi, India, July 31, 2012.

A traffic jam following power outage and rains at the Delhi-Gurgaon road on the outskirts of New Delhi, India, July 31, 2012.

Indian stranded passengers wait inside a stalled train as they wait for the services to resume after a power outage in New Delhi, India, July 31, 2012.

Trains are parked at the New Delhi railway station following a power outage in New Delhi, India, July 31, 2012.

Indian stranded passengers wait for the train services to resume following a power outage in New Delhi, India, July 31, 2012.

Commuters wait for buses outside a Metro station after Delhi Metro rail services were disrupted following power outage in New Delhi, India, July 31, 2012.

Indian commuters wait for a bus on a street illuminated with street vendor's kiosks following a power outage in Kolkata, India, July 31, 2012.

Commuters walk on empty railway tracks at the New Delhi railway station following a power outage in New Delhi, India, July 31, 2012.

Commuters wait for buses outside a Metro station after Delhi Metro rail services were disrupted following power outage in New Delhi, India, July 31, 2012.

Trains stop in service at a railway station following a power outage in New Delhi, India, July 31, 2012.

Indian people crowd a door of a train as they wait for the train services to resume following a power outage at a railway station in New Delhi, India, July 31, 2012.