Geothermal energy works by extracting the free and reliable heat energy deep within the earths core. Today there are different technologies available which can harness this immense, renewable, and low or zero emissions energy resource. Hydrothermal systems are the most common source of geothermal energy production around the world exploiting the hot water and/or steam trapped deep underground in fractured or porous rock formations. Hydrothermal sources can be used directly to heat buildings, greenhouses, and swimming pools, or used to produce steam for electrical power generation. The technology used to convert geothermal energy into an important energy resource for our world is well established and known
