Near Reykjadulur Hot Spring Thermal River, Iceland. Due to the geological location of Iceland (over a rift in continental plates), the high concentration of volcanoes in the area is often an advantage in the generation of geothermal energy, the heating and making of electricity. During winter, pavements near these areas (such as Reykjavik and Akureyri) are heated up. Five major geothermal power plants exist in Iceland, which produce approximately 26.2% (2010) of the nation's electricity. In addition, geothermal heating meets the heating and hot water requirements of approximately 87% of all buildings in Iceland. Apart from geothermal energy, 73.8% of the nation's electricity is generated by hydro power, and 0.1% from fossil fuels. Hydrogen sulfide (H2S) from geothermal energy may have impacted the health of Icelanders.