Geothermal energy utilizes the accessible thermal energy from the Earth’s interior. Heat is extracted from geothermal reservoirs using wells or other means. The technology for electricity generation from hydrothermal reservoirs is mature and reliable, and has been operating for more than 100 years. The vast majority of Earth’s heat is constantly generated by the decay of radioactive isotopes, such as potassium-40 and thorium-232. Radioactive decay is a continual process in the core. Temperatures there rise to more than 5,000° Celsius (about 9,000° Fahrenheit).
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Related Associations and Societies:
EKO energy | The Biomass Thermal Energy Council | International Hydropower Association | Geothermal Energy Association | World Bioenergy Association | International Energy Agency | American Council for an Energy-Efficient Economy | Office of Energy Efficiency and Renewable Energy |