Geothermal energy is heat energy that comes from the inside of the molten core of the earth.
This heat is generated near the surface of the Earth due to the crustal plate movement by intrusions of molten magma and/or as a result of deep circulation of groundwater. This way, hot water tanks are formed under pressure.
In some areas of the globe, there are surface manifestations of geothermal energy, such as geysers, fumaroles, and hot springs that have been used since ancient times for bathing and cooking.
The use of geothermal energy is accomplished by drilling boreholes, which are used to take in water steam located in those tanks or water under high pressure and direct it to drive turbines in power plants. This way thermal energy is converted into electrical energy. In the cases where geothermal water temperature is insufficient for the production of electricity, geothermal water is used to generate heat.