Compare ENERGY STAR Certified Geothermal Heat Pumps, find rebates, and learn more.

Basics Some applications of geothermal energy use the earth's temperatures near the surface and others require drilling miles into the earth. There are three main types of geothermal energy systems: Direct use and district heating systems Geothermal power plants Geothermal heat pumps Direct use and district heating systems

of or connected with the heat inside the earth: a geothermal power station SMART Vocabulary: related words and phrases Hot & heat bake baking beat down blistering blisteringly boiling closeness electrothermal fug glow haze haze over heated overheat suffocatingly superhot sweltering swelteringly thermally torrid See more results »

Vocabulary Geothermal energy is heat that is generated within the Earth. ( Geo means “earth,” and thermal means “heat” in Greek.) It is a renewable resource that can be harvested for human use. About 2,900 kilometers (1,800 miles) below the Earth’s crust, or surface, is the hottest part of our planet: the core.