6. Reykjavik, Iceland
The Icelandic capital Reykjavik city has the largest geo-thermal heating system in the world. There are 30 active volcanoes in total in the country. This leads to Icelanders to rely on hydrothermal energy than fossil fuels. In fact 100 percentage of the electrical requirement of Reykjavik city derived from hydro-geothermal energy sources.
The high availability of geothermal power in the city also meets the needs of hot water for the majority of inhabitants. It is because there is a consistent cold climate in Reykjavik city. The use of these renewable energy sources also keep the city away from excessive emissions of carbon dioxide.