Geothermal energy harnesses the natural heat from within the Earth as a source of energy. It originates from the Earth's formation and radioactive decay. Geothermal energy has advantages like being a natural and renewable resource that reduces reliance on fossil fuels. However, it also has disadvantages like high installation costs and limited availability. Several geothermal power plants around the world utilize underground steam and hot water to generate electricity, with the largest being Cerro Prieto in Mexico at 720MW capacity.