In simple terms, in a traditional geothermal plant, steam or superheated water from deep inside the Earth is used to drive a turbine and generate electricity.
Geothermal power could prove to be the cleanest, greenest and most abundance source of power of all. Geothermal is very sustainable, as demonstrated by one of the first modern sites that was established in Lardarello, Italy in 1904. That site is still producing power to this day!
There has been a recent resurgence in interest in Geothermal power, as oil prices have risen and new sources of fossil fuels become harder to find.
Geothermal currently produces 65% more power in the US than solar and wind combined. Its true potential is only just starting to be tapped by a few innovative companies!