2. Describing an energy system that makes use of the internal heat produced by the earth.
You may see more information about geothermal drilling here.
2. Heat which is produced mainly by the decay of naturally occurring radioactive isotopes of thorium, potassium, and uranium in the earth's core.
3. An energy produced by tapping the earth's internal heat. At present, the only available technologies to do this are those that extract heat from hydrothermal convection systems, where water or steam transfer the heat from the deeper part of the earth to the areas where the energy can be tapped.
The amount of pollutants found in geothermal vary from area to area but may contain arsenic, boron, selenium, lead, cadmium, and fluorides. They also may contain hydrogen sulphide, mercury, ammonia, radon, carbon dioxide, and methane.
Getting the Earth's Heat
Geothermal power plants, which tap hot subterranean water or steam, are high on the lists of at least thirty states in the U.S. which are requiring utility companies to generate some portion of their electricity from such renewable sources.
Most utilities have not pursued geothermal energy primarily because up-front costs, including exploratory drilling, can be expensive since geothermal taps deep reservoirs, not groundwater, which collects much closer to the surface.
An extensive study recently released by the Massachusetts Institute of Technology has shown that the heat available under ground is surprisingly plentiful nationwide.
More information about special Geothermal Energy sources.
2. The process of purposely transporting geothermal energy from beneath the earth for human use; that is, the building of a well and pipeline system to bring heated water to a power plant.
Like other related "plant" references, this entry is apparently linked to the action of pressing on a shovel, or some other apparatus, with the "sole of the foot" in order to work the soil for the development of plants.
Some reservoirs can be commercially developed as an energy source.
Any technological system that makes use of this heat as an energy source; such as, to power an electrical power plant or to heat or to cool a building.
This form of energy is both clean, sustainable, and renewable and the technology has caught on in countries with substantial geothermal activity; such as Iceland, where it accounted for 54 percent of primary energy use.
Resources of geothermal energy range from the shallow depths of hot water and hot rock found a few miles beneath the earth's surface, and down even deeper to the extremely high temperatures of molten rock called magma.
In the United States, the best sources for geothermal power are in the west, where there are many underground lakes of heated water; however, large-scale access would require drilling.
A major goal is to find a way to harness energy directly from magma (molten rock material), which has great potential because of its high temperature.
The earth’s heat lies below the surface everywhere, and it is believed that it offers an untapped energy reserve of enormous potential with a very short list of drawbacks.
Some of the negative aspects of geothermal development is that it will mean more competition for scarce water, more holes in the ground, and more roads to service those holes.
The fluid is contained in a variety of loop (pipe) configurations depending on the temperature of the ground and the ground area available.
Loops may be installed horizontally or vertically in the ground or submersed in a body of water.
Mile-or-more-deep wells can be drilled into underground reservoirs to tap steam and very hot water that can be brought to the surface for use in a variety of applications. In the United States, most geothermal reservoirs are located in the western states, Alaska, and Hawaii.