That sounds really good... until you actually look at the math.
U.S. Energy Information Administration (EIA) - Source
I am no fan of coal and I don't see a way yet to refine it for clean energy. I'd love to choose cleaner alternatives for electrical generation. Lets not make stuff up about how much cheaper PV electricity will be. It won't. Think Progress routinely makes stuff up and twists the facts to favor the political left. Probably not the most reliable news source IMO.