Geothermal energy is power generated by the harnessing of heat beneath the Earthís surface. Wells are used to pipe steam and hot water from deep within the Earth, up to the surface. The hot water is then used to drive turbines and generate electricity. The regions with highest underground temperatures are in areas with active or geologically young volcanoes. These "hot spots" often occur around the Pacific Rim. This area is also known as the "Ring of Fire" due to the large number of volcanoes.