EPA has a mandate to investigate causes of enviromental problems and issue regulations to reduce those problems. *IF* they are correct about power plant emissions being a problem, then shutting down a few non-compliant plants may be progress..notwithstanding financial losses!.
   This is a matter of 'erring on the side of caution', if there is erring at all. Industry is always reluctant to admit they are causing problems as long as the 'problem' makes them more money than stopping! (Remember tobacco company lies & denials for years?)

I am awed at the number of conservative 'scientific' arguments where they simply quote each other on their own interpretations OF scientific data, rather than the majority of non-aligned scientists! If 1000 experts say man-made problems are a serious issue, and 10 conservative scientists disagree, guess who gets quoted?