MIT Energy Futures, Autumn 2016, by Francesca McCaffrey.
http://news.mit.edu/2016/mapping-coal-decline-and-renewables-rise-0622

"A new study from MIT researchers, however, shows that coal’s economic edge may soon be far thinner than we think. In a working paper for the MIT Energy Initiative, graduate students Joel Jean, David C. Borrelli, and Tony Wu show how replacing current coal-fired power plants with wind and solar photovoltaic generation facilities could provide benefits for the environment and for bottom lines in the near future. The online tool they’ve created to help illustrate this argument is CoalMap, a web application that compares the levelized cost of electricity (LCOE) — that is, the minimum electricity price a power plant must receive to break even on investment costs over its lifecycle — of existing U.S. coal-fired plants with the expected LCOE of potential new utility-scale solar and wind generation in the same locations."