stretch for an instant, then spit the infrared light a heat a back out in all directions. So while 280 ppm was cozy, 380 ppm (and rising) looks like trouble. ... of conventional coal-burning plants and their replacement with plants using integrated gasification combined cycle technology. ... than a third of their coal energy into electrical energy, and also scrub pollutants such as mercury and sulfur dioxide more effectively. ... It wona#39;t become operational before about 2013, Xcel officials say.