By 2022 residential rooftops in India will generate as much power as India's national grid.
"KPMG predicts that, by 2022, India's residential rooftops will generate nearly as much solar power as the country's large-scale grid-connected solar power plants."
Source: Jerry-Lynn Scofield, “Shout it from the rooftops,” The Intelligent Optimist, September/October 2012, 57. (No link available) [verified 4/18/14]