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Renewable Energy Geothermal Energy refers to the utilization of heat from within the Earth's crust to produce electricity or heat for various applications. This form of renewable energy harnesses the natural heat stored beneath the Earth's surface through the use of geothermal power plants or direct-use systems. Geothermal energy is considered sustainable and environmentally friendly, as it relies on the Earth's natural heat sources, such as volcanic activity or radioactive decay, to generate power without producing greenhouse gas emissions.