Both the number of countries producing geothermal power and the total worldwide geothermal power capacity under development appear to be increasing significantly. In 2005, there were 8,933 MW of installed power capacity in 24 countries, generating 55,709 GWh per year of green power, according to the International Geothermal Association. While power on-line grew 20% between 2005 and 2010, countries with projects under development grew at a much faster pace. The underlying trend of the expansion of geothermal power is complemented by the development of projects in entirely new areas. It is interesting to note that there are 24 countries identified with geothermal power projects under development that were not included in the GEA 1999 study.
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