Heat generated from the earth s surface is called as geothermal heat. This form of energy is the clean and sustainable. They can be from the shallow ground to hot water and hot rock found beneath the earth surface, also found extremely deeper to the extremely high temperatures of molten rock called magma. It is the clean energy. Usually the heat pumps have 3-4.5 COPs that means 3-4.5 unites are used for supplying the heat. Geothermal heat pump is having 400% efficiency as compared to the fossil fuel furnace which is having the energy efficiency of 78-90 %. With all the possible advantages there is a con with the geothermal heat that in the extreme conditions it can also cause earthquake. The sustainability of geothermal energy is highly dependent on proper management of the reservoirs. With these minor issues, Geothermal is having the massive worldwide potential of 2 terawatts (TW). It also gives the less fluctuation cost with stable electricity cost.