Geothermal energy has been produced commercially for nearly a century, and on the scale of hundreds of megawatts (MW) for over four decades, both for electricity generation and direct use. Worldwide direct use energy production is about 37 terrawatt hours annually (TWh/a) (installed capacity of 10,000 megawatts-thermal [MWt] in nearly forty countries), and is, with the exception of China, mainly in the industrialized and Central and Eastern European countries.
展开▼
