The power is always greener on this side of the mountain. Green Mountain Energy, a NRG Energy company, buys and resells green power generated from hydroelectric, solar, wind, geothermal, and natural and landfill gas facilities. Since 1997 it has helped develop more than 50 wind and solar renewable facilities around the US. The company's renewable energy facilities have been responsible for avoiding the use of more than 19.4 billion pounds of carbon dioxide emissions, a primary contributor to global warming (or the equivalent of taking 1.7 million automobiles off the road).