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Geothermal energy is heat derived below the earthâs surface which can be harnessed to generate clean, renewable energy.This vital, clean energy resource supplies renewable power around the clock and emits little or no greenhouse gases -- all while requiring a small environmental footprint to develop.eothermal energy is heat derived below the earthâs surface which can be harnessed to generate clean, renewable energy.
The fact sheet discusses what geothermal energy is, the history behind the source, and provides diagrams of the interior of the Earth and of a power plant extracting geothermal heat. References Clean Energy: How Geothermal Energy Works from the Union of Concerned Scientists, December 2006.