Geothermal power plants generate electricity by harnessing heat from the Earth's interior. This heat can be found in hot water or steam reservoirs underground. The steam is used to turn turbines, which then generate electricity. These plants are often located in areas with high volcanic activity, where the Earth's heat is more accessible. There are three main types of geothermal power plants: dry steam, flash steam, and binary cycle. Each type uses different methods to convert geothermal energy into electricity. Geothermal energy is considered a renewable resource because it relies on the Earth's natural heat, which is continuously replenished.