Because China is caught in the bind of rising expectations. And, as the price of grid scale storage gets cheaper, many of those plants will be shut down before they have reached their normal first major maintenance. Many of the nations where China is building these coal fired plants have good solar and/or wind potential. Solar and wind, plus storage, is not only the cheapest way to go, it also produces the 'cleanest' electricity for the grid, as it can adjust for changes in demand in micro-seconds, rather than minutes.