Energy Collective: Across the United States, economics are increasingly favoring investment in renewable energy at the expense of dirty coal energy. As the price of solar dips below coal and even natural gas in some instances, the domestic demand for coal wanes and a growing number of companies are eager to get out of their investments in aging coal plants that cost more than theyre worth to upgrade and, in a growing number of instances, just to keep running. As the nations coal power plants age, they become more...