Iceland appeals to cryptocurrency miners for two major reasons - cheap electricity, and having to use less of it, because of Iceland's naturally cold climate.Typically, the majority of the electricity costs involved in mining does not go towards powering the miners themselves, but rather keeping them cool and preventing the hardware from overheating.Surprisingly however, the mining operation is facing some backlash from local environmentalists, and their concerns appear to be unfounded. Hydro-electric and natural geothermal energy serve as the miners power sources, and Geothermal energy is a natural resource abundant in Iceland, due to the countries high volcanic activity.Both power forms are considered eco-friendly, sustainable and renewable.