Northern India's power grid crashed Monday, halting hundreds of trains, forcing hospitals and airports to use backup generators and leaving 370 million people - more than the population of the United States and Canada combined - sweltering in the summer heat. The blackout, one of the worst to hit India in a decade, highlighted the nation's inability to feed a growing hunger for energy as it strives to become a regional economic power, according to a report of the Associated Press. The country's northern grid crashed about 2:30 a.m. because it could no longer keep up with the huge demand for power in the hot summer, officials in the state of Uttar Pradesh said. However, Power Minister Sushil Kumar Shinde said he was not sure exactly what caused the collapse and had formed a committee to investigate it. By late morning, 60 percent of the power had been restored in the eight northern states affected by the outage and the rest was expected to be back on line by the afternoon, Shinde said. Shivpal Singh Yadav, the power minister in the state of Uttar Pradesh, home to 200 million people, said that while demand during peak hours hits 11,000 megawatts, the state can only provide 9,000 megawatts.