The moves include loosening environmental rules, but it is unclear how much they can help reverse the sharp decline in coal power over the last two decades.

President Trump on Tuesday is expected to sign an executive order aiming to bolster U.S. coal mining. In the order, Trump will define coal as a “mineral,” allowing it to benefit from a previous

The median age of the retired plants is 56 years and as coal plants age, maintenance costs also rise, subsequently pushing up generation costs. In addition to these costs, any uni