||It has been suggested that Lardarello be merged into this article. (Discuss) Proposed since January 2012.|
The region has experienced occasional phreatic volcanic eruptions, caused by explosive outbursts of steam trapped below the surface. It possesses a dozen explosion craters 30-250 m in diameter. The largest is the Lago Vecchienna crater, now filled by a lake, which last erupted around 1282.
Larderello now produces 10% of the world's entire supply of geothermal electricity, amounting to 4,800 GWh per year and powering about a million Italian households. Its geology makes it uniquely conducive to geothermal power production, with hot granite rocks lying unusually close to the surface, producing steam as hot as 202 °C (396 °F).
Known as Montecerboli until the 19th century, it became one of the first places in the world where geothermal energy was exploited to support industry. In 1827 François de Larderel, a Frenchman, invented a way of extracting boric acid from the volcanic mud by using steam to heat cauldrons to separate the two. Leopold II, Grand Duke of Tuscany was an enthusiastic supporter of Larderel's scheme and awarded him the title of Count of Montecerboli a decade later. A town, named Larderello in honour of Larderel's work, was founded to house the workers in the boric acid production factory. 
The region was the site of a pioneering experiment in the production of energy from geothermal sources in 1904, when five light bulbs were lit by electricity produced through steam emerging from vents in the ground - the first ever practical demonstration of geothermal power.
Prince Piero Ginori Conti tested the first geothermal power generator on 4 July 1904, at the Larderello dry steam field in Italy. It was a small generator that lit four light bulbs. In 1911, the world's first geothermal power plant was built in the Valle del Diavolo ("Devil's Valley"), named for the boiling water that rises there. It was the world's only industrial producer of geothermal electricity until 1958, when New Zealand built a plant of its own in Wairakei. In recent years concerns have been expressed about the sustainability of its steam supply, as a 30% drop in steam pressure levels has been recorded from the maximum levels of the 1950s.
- Tiwari, G. N.; Ghosal, M. K. Renewable Energy Resources: Basic Principles and Applications. Alpha Science Int'l Ltd., 2005 ISBN 1-84265-125-0
- "Larderello". Global Volcanism Program, Smithsonian Institution. http://www.volcano.si.edu/world/volcano.cfm?vnum=0101-001.
- "Steaming Forward", Time magazine, June 16, 2003 (subscription required)
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