Water that is pumped down can be heated and brought back to the surface. The magma always remains hot. This resource cannot be used up and is renewable. Advantages of geothermal energy Geothermal energy can be inexpensive if it is used near the source. Geothermal energy releases no carbon dioxide and few pollutants compared to fossil fuels.
Geothermal energy can provide a continuous energy source for a long time.
Geothermal energy is free once the initial buildings and machinery are installed. Geothermal deposits are widespread around the world. It can be expensive to find areas of hot rock deep underground. Initial buildings and machinery can be expensive. The steam that comes from underground can contain air pollutants and other chemicals.