Several attributes make it a good source of energy. First, it's clean . Energy can be extracted without burning a fossil fuel such as coal, gas, or oil.
Geothermal power is homegrown , reducing our dependence on foreign oil.
Even in geothermal areas dependent on a reservoir of hot water, the volume taken out can be reinjected, making it a sustainable energy source. However, Earth energy can be tapped almost anywhere with geothermal heat pumps and direct-use applications. Only excess steam is emitted by geothermal flash plants. No air emissions or liquids are discharged by binary geothermal plants, which are projected to become the dominant technology in the near future. Salts and dissolved minerals sometimes contained in geothermal fluids are usually reinjected with excess water back into the reservoir at a depth well below groundwater aquifers.