India's energy crisis spread over half the country Tuesday when both its eastern and northern electricity grids collapsed, leaving 600 million people without power in one of the world's biggest-ever blackouts. Traffic lights went out across New Delhi. The city's Metro rail system, which serves about 1.8 million people a day, immediately shut down for the second day in a row. The new power failure affected people across 13 states - more than the entire population of the European Union. They raised concerns about India's outdated infrastructure and its insatiable appetite for energy that the government has been unable to meet. --Associated Press, 31 July 2012