It is estimated that India possesses 8000-9000 MW of tidal energy potential. Sea water keeps on rising and falling alternatively twice a day under the influence of gravitational pull of moon and sun. Areas with constantly high speed preferably above 20 km per hour are well-suited for harnessing wind energy. The gross wind power potential of India is estimated to be about 20,000 MW, wind power projects of 970 MW capacities were installed till March. Wind power is harnessed by setting up a windmill which is used for pumping water, grinding grain and generating electricity. More over they do not require heavy expenditure. All these sources are renewable or inexhaustible and do not cause environmental pollution. Energy generated by using wind, tides, solar, geothermal heat, and biomass including farm and animal waste as well as human excreta is known as non-conventional energy.