The red-hot renewable that could incite a green power revolution. Geothermal power, from heated underground water, and now through new technology from underground volcanic magma, has very favorable life-cycle benefits compared against other renewable energy sources. Untapped geothermal energy in the US is estimated to be between 100 and 500 gigawatts, and Nevada is especially rich in this resource. Read the ClimateProgress article by clicking here.