AdvertisementIt's Not Easy, But Aspen Moves Toward 100 Percent Renewable EnergyJuly 05, 2017Grace HoodfacebookEmailIn 2015 Aspen, Colo., reached 100 percent renewable energy powering of its electric utility. "Getting the last 25 percent was a huge challenge for us," says Aspen Mayor Steve Skadron. (Colorado Public Radio)