hot water and hot rock Geothermal

Geothermal energy is the heat from the Earth. It's clean and sustainable. Resources of geothermal energy range from the Hot dry rock resources occur at depths of 3 to 5 miles everywhere beneath the Earth's surface and at lesser depths in certain areas. Access to these resources involves injecting cold water down one well, circulating it through hot fractured rock, and drawing off the heated water from another well. Currently, there are no commercial applications of this technology. Existing technology also does not yet allow recovery of heat directly from magma, the very deep and most powerful resource of geothermal energy.

Many technologies have been developed to take advantage of geothermal energy

the heat from the earth. NREL performs research to develop and advance technologies for the following geothermal applications:
Generating electricity from the earth's heat,

Geothermal Direct Use
Producing heat directly from hot water within the earth.

Using

the shallow ground to heat and cool buildings.