Icelands famous Blue Lagoon spa is in a lava field on the actively volcanic Reykjanes Peninsula. It is supplied by water used in the nearby Svartsengi geothermal power station. The steam from that station is shown here and the spa is right next door. The power station was the worlds first geothermal power plant for electric power generation and hot water production for urban use. Most of the heating in Iceland comes from geothermal power. Natural hot water was used to heat roughly 90% of all buildings in Iceland.