Geothermal energy is the process of gaining heat as energy source from earth’s surface. Most of power plants require steam for generating electricity. Geothermal power plants use steam which is produced from hot water tanks discovered far below earth’s surface. A turbine is rotated by steam which helps to run a generator for electricity production. Most power plants are using conventional fuels to boil water for steam. Earth’s surface holds huge amount of heat which can produce extremely huge amount of energy than all other natural resources like oil and gas in the world. Predicted heat extraction in geothermal energy is very small in comparison to heat content of earth. So, it is renewable.