geothermal power, form of energy conversion in which geothermal energy—namely, steam tapped from underground geothermal reservoirs and geysers—drives turbines to produce electricity. It is considered a form of renewable energy. While humans have long made direct use of geothermal energy as a source of heated water, the first geothermal electric power generation took place in Larderello, Italy, with the development of an experimental plant in 1904. The first commercial use of that technology occurred there in 1913 with the construction of a plant that produced 250 kilowatts (kW). Geothermal power plants were commissioned in New Zealand starting in 1958 and ...(100 of 1530 words) Access the full article Help support true facts by becoming a member. Subscribe today!