Recently Ministry of New and Renewable Energy(MNRE) along with National Institute of Solar Energy(NISE), Gurgaon released the total solar power potential in India. The calculations are based on the census 2011 and also the data from India waste land Atlas 2010.
http://headwaysolar.com/blog/wp-content/uploads/2014/12/Statewise-Solar-Potential-NISE.pdf
