The U.S. Environmental Protection Agency (EPA) is extending the public comment period for the proposed rule to disapprove in part and approve in part a revision of Arizona's State Implementation Plan (SIP). This will include the implementation of the regional haze program in Arizona for the first planning period through July 31, 2018. This proposed action does not include the three following electric generating stations which were addressed in a final rule published on December 5, 2012: Apache Generation Station, Cholla Power Plant, and Coronado Generating Station

Written comments on the proposed action were originally due on or before February 4, 2013. The new deadline is March 6, 2013, which will provide an additional 30 days, totaling 75 days to comment on the proposed rule. More information can be found here.