More than half the country of India is in the dark Tuesday. A massive blackout has left 600 million people without power after India's eastern and northern electricity grids collapsed.

It's one of the world's biggest blackouts ever. Hundreds of trains stalled across the country and traffic lights went out, causing widespread traffic jams in New Delhi.

Power Minister Sushil Kumar Shinde chastised the states for the collapse, saying they're using too much electricity.

"Everyone overdraws from the grid," he said. "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."

The power crisis is raising serious concerns over India's growing electrical needs and the governments inability to meet them.

In recent months, India's central electricity authority reported power deficits of more than 8 percent.

The government is still unsure what caused this recent grid breakdown.