MATHURA, India -- Salma Khan, a petite, young woman, shows off her one room store where she sells food products such as lentils, flour, packaged noodles and biscuits. She is particularly pleased about two recent additions to her tiny village shop. In the midst of the stacks of groceries is a pedestal fan that helps her combat summer heat of above 40 C, and high on the wall in one corner is a foot-long fluorescent light. Both are powered by a battery connected to a solar panel on the roof of the shop.