Geothermal power plants are an almost pollution free source of electricity. Typically they are installed near shallow subsurface sources of steam and / or hot water characterized by faults, seismic activity, earthquakes and volcanoes.

The source of geothermal power generation is steam at a temperature of ~300 degree C. To access geothermal steam involves drilling a vertical well to the source. A second well is drilled to the lower water level of the steam source. The steam is directed into a steam turbine which in turn generates electricity. The condensed turbine exhaust is re-injected back into the underground reservoir.

One of the alternative energy industries that hasn't received much press coverage is the geothermal group of stocks. Geothermal generation utilizes natural underground heat sources that powers a turbine which turns a generator. The word 'geothermal' comes from the Greek words 'geo', which means 'earth', and 'therme,' which means 'heat'. As it turns out, several of these geothermal stocks have been steaming in terms of stock price.

Here is the list:

Geothermal generation utilizes natural underground heat sources to power a turbine which drives a generator. Geothermal comes from the Greek words geo, which means earth, and therme, meaning heat. The literal translation of geothermal is "earth heat." And as it turns out, several of these geothermal stocks are heating up: