Northern India's power grid crashed Monday, halting trains, forcing hospitals and airports onto backup power and providing a dark reminder of the nation's inability to feed a growing hunger for energy as it strives to become an economic power. While the midsummer outage was unique in its reach - it hit 370 million people, more than the population of the United States and Canada combined - its impact was softened by Indians' familiarity with almost daily blackouts of varying duration. Hospitals and major businesses have backup generators that seamlessly kick in during power cuts, and upscale homes are hooked to...