According to the data from The International Geothermal Association (IGA) 10,715 megawatts of geothermal power in 24 countries is currently online.The global potential of conventional geothermal sources is estimated to be 70 Gigawatts (GW).
In 2007, joined capacity of all world's geothermal power plants satisfied only 0.3% of global electricity demand.
United States are the current world leader in installed geothermal energy capacity with 3,086 MW. United States currently has 77 operation geothermal power plants.
It has been calculated that geothermal plants use 3.5 square kilometres (1.4 sq mi) per gigawatt of electrical production, and use use 20 litres (5.3 US gal) of freshwater per MWh.
Geothermal power plant construction costs (including drilling) are about 2-5 million € per MW of electrical capacity.
Geothermal power plants emit an average of 122 kg of CO2 per megawatt-hour of electricity.
Operational and maintenance costs of geothermal power plants are in average $0.01 - $0.03 per kWh.
Lately very popular Enhanced geothermal systems (EGS) have capital costs above $4 million per MW and levelized costs above $0.054 per kWh.
Geothermal power plants have an excellent load factor of around 90%.
Global geothermal installed capacity has experienced significant growth from 7,972 MWe in 2000 to around 9,700 MWe in the year 2007.
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