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This action will address the Agency's residual risk and technology review (RTR) of the National Emission Standards for Hazardous Air Pollutants: Coal- and Oil-Fired Electric Utility Steam Generating Units (commonly referred to as the Mercury and Air Toxics Standards (MATS)), 40 CFR 63, subpart UUUUU, promulgated pursuant to section 112(d) of the Clean Air Act (CAA) on February 16, 2012 (67 FR 9464), and address other issues associated with the 2012 rule.

Statement of Need:

The EPA has completed its initial review of the MATS Supplemental Cost Finding (81 FR 24420, April 25, 2016) to determine if the finding will be reconsidered. The EPA will issue the results of the review in a notice of proposed rulemaking and will solicit comment on the resulting finding. The EPA will also, in the same action, propose the results of the RTR for MATS.

Summary of the Legal Basis:

CAA section 112, 42 U.S.C. 7412, provides the legal framework and basis for regulatory actions addressing emissions of hazardous air pollutants from stationary sources. CAA section 112(f)(2) requires EPA, within 8 years of the promulgation of standards under CAA section 112(d), to determine whether additional standards are needed to provide an ample margin of safety to protect public health or to prevent an adverse environmental effect. CAA section 112(d)(6) requires EPA to review, and revise as necessary, emission standards promulgated under CAA section 112(d) at least every 8 years, taking into account developments in practices, processes and control technologies.

Alternatives:

Not yet determined. The EPA will consider whether alternative options are warranted once the Agency has completed the review of the Supplemental Cost Finding and the RTR.

Anticipated Costs and Benefits:

Not yet determined. Costs and benefits will depend upon the results of the review of the Supplemental Cost Finding and on the results of the RTR.

Risks:

Not yet determined. Risks will depend upon the results of the review of the Supplemental Cost Finding and on the results of the RTR.