Renewable energy sources include solar, wind, biomass, tidal, and geothermal energy. They are freely available from nature and can be continuously renewed, unlike conventional energy sources which are limited. Renewable energy sources are needed because conventional sources are limited, costs are increasing, transportation is difficult and costly, and they cause pollution. India has potential to harness energy from solar, wind, biomass, tidal, and geothermal sources. These renewable sources maintain ecological balance and are always available. Solar energy provides 7 kWh/day/square meter but has low density and is not continuous. Wind energy potential varies by location from 8-25 km/hr at seashores, and has been used to generate electricity via