Installed capacity data from Bertani, Ruggero (September 2007), "World Geothermal Generation in 2007" archive copy at the Wayback Machine, Geo-Heat Centre Quarterly Bulletin (Klmath Falls, Oregon: Oregon Institute of Technology) 28 (3): pp. 8-19, ISSN 0276-1084, retrieved on 2009-04-12

Realized production data from Fridleifsson,, Ingvar B.; Bertani, Ruggero; Huenges, Ernst; Lund, John W.; Ragnarsson, Arni; Rybach, Ladislaus (2008-02-11). O. Hohmeyer and T. Trittin. ed (pdf). The possible role and contribution of geothermal energy to the mitigation of climate change^{[dead link]}. Luebeck, Germany. pp. 59-80. Retrieved on 2009-04-06.

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