Reykjavik, Iceland. Green City Times (www.greencitytimes.com) calls Reyjkavik a “Renewable Energy Mecca”. The City has pioneered the use of geothermal power for citywide district heating. It also meets nearly all of its electricity and domestic hot water needs from hydroelectric and geothermal sources. “Green City: Reykjavik, Iceland” www.greencitytimes.com