(The Gazette 6-1-2012) Outside the Ray Nixon Power Plant south of Colorado Springs sits 3.3 million tons of coal ash, the remnant of three decades of coal-fired power generation. Nationwide, 20 percent of that residue, called fly ash, is recycled into concrete, but the 80,000 to 100,000 tons of fly ash produced each year by Colorado Springs Utilities’ two coal power plants doesn’t consistently meet construction industry standards. So, it collects in a landfill that grows by hundreds of tons every day.