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.

Hundreds of trains stalled across the country and traffic lights went out, causing widespread traffic jams in New Delhi. Electric crematoria stopped operating, some with bodies half burnt, power officials said.

The massive failure _ a day after a similar, but smaller power failure _ has raised serious concerns about India's outdated infrastructure and the government's inability to meet its huge appetite for energy as the country aspires to become a regional economic superpower.

Power Minister Sushil Kumar Shinde blamed the new collapse on states taking more than their allotted share of electricity.

`'Everyone overdraws from the grid. Just this morning I held a meeting with power officials from the states and I gave directions that states that overdraw should be punished. We have given instructions that their power supply could be cut," he told reporters.

The new power failure affected people across more than a dozen states _ more than the entire population of the European Union. The blackout was unusual in its reach, although its impact was softened by Indians' familiarity with frequent blackouts and the widespread of backup generators for major businesses.

Shinde said officials were working to get power restored as quickly as possible.

The outages came just a day after India's northern power grid collapsed for several hours. Indian officials managed to restore power several hours later, but at 1:05 p.m. Tuesday the northern grid collapsed again, said Shailendre Dubey, an official at the Uttar Pradesh Power Corp. in India's largest state. About the same time, the eastern grid failed and then the northeastern grid followed, energy officials in those regions said. The grids serve more than half India's population.

In West Bengal, express trains and local electric trains were stopped at stations across the state of West Bengal on the eastern grid. Crowds of people thronged the stations, waiting for any transport to take them to their destinations.

Chief Minister Mamata Banerjee said it would take at least 10 to 12 hours to restore power and asked office workers to go home.

"The situation is very grave. We are doing everything to restore power," West Bengal Power Minister Manish Gupta said.

New Delhi's Metro rail system, which serves about 1.8 million people a day, immediately shut down for the second day in a row. Police said they managed to evacuate Delhi's busy Rajiv Chowk station in under half an hour before closing the shutters.

S.K. Jain, 54, said he was on his way to file his income tax return when the Metro closed and now would almost certainly miss the deadline.

India's demand for electricity has soared along with its economy in recent years, but utilities have been unable to meet the growing needs. India's Central Electricity Authority reported power deficits of more than 8 percent in recent months.

The power deficit was worsened by a weak monsoon that lowered hydroelectric generation and kept temperatures higher, further increasing electricity usage as people seek to cool off.

But any connection to the grid remains a luxury for many. One-third of India's households do not even have electricity to power a light bulb, according to last year's census.

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Associated Press writer Nasr ul Hadi contributed to this report from New Delhi and Prasanta Pal contributed from Kolkata.

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