In February 2012 the Federal Register published final rules entitled National Emission Standards for Hazardous Air Pollutants (NESHAP) From Coal and Oil Fired Electric Utility Steam Generating Units and Standards of Performance (NSPS) for Fossil Fuel Fired Electric Utility, Industrial, Commercial, Institutional and Small Industrial, Commercial, Institutional Steam Generating Units. The US EPA recently provided notice that it has already responded to 23 petitions for reconsideration. The agency had granted reconsideration on several discrete issues in the past and then took final action on reconsideration in April 2013 and again in November 2014. On April 21, 2015 the Administrator denied the remaining reconsideration requests in separate letters to the petitioners. The agency did provide a full explanation of the rationale for each denial in the docket for the rules.