Geothermal power. Iceland

Nesjavellir Geothermal Power Plant. iceland

Iceland heats 90% of their homes with geothermal energy. 80% of their power comes from hydro with the remainder from geothermal. It’s so cheap that they heat sidewalks in winter with it. While geothermal isn’t completely renewable, it is certainly mostly so, which makes Iceland probably unique in that virtually all its power and heating is from renewable, clean resources. And it’s cheap!

More. National Energy Authority of Iceland. Wikipedia.