Since all coverage of this issue — which will affect the power industry in the US — is entirely ideological, several links are provided below to frame the broad contours of the “facts” since the facts of the case are also seen through the scrim of ideology :

http://www.scotusblog.com/2015/03/argument-analysis-epa-may-be-a-vote-short-or-not/

https://www.law.cornell.edu/supct/cert/14-46

http://www.cato.org/publications/legal-briefs/michigan-v-epa

There appear to be at least three sets of “facts” in this case.  Comments that contain links to the science, engineering and economic studies that frame the case are gratefully received.   Link to podcast of the actual Supreme Court hearing which took place March 2015:

http://www.oyez.org/cases/2010-2019/2014/2014_14_46#transcript-text87828