Visitors take photos of famous geyser in north Reykjavik, Iceland, Nov. 19, 2008. Geothermal energy is very often used for heating and production of electricity in Iceland. The energy is so inexpensive that in the wintertime, some pavements in Reykjavík are heated. In Iceland, there are five major geothermal power plants, which produce 26.5 percent of the country's electricity. In addition, geothermal heating meets the heating and hot water requirements for around 87 percent of the nation's buildings. [Xinhua Photo]