{"abstract":"The Environmental Protection Agency (EPA) is soliciting comment on a proposed supplemental finding that consideration of cost does not alter the agency's previous conclusion that it is appropriate and necessary to regulate coal- and oil-fired electric utility steam generating units (EGUs) under section 112 of the Clean Air Act (CAA). In light of the U.S. Supreme Court decision in Michigan v. EPA, 135 S.Ct. 2699 (2015), the EPA has taken cost into account in evaluating whether such regulation is appropriate. In this document, the EPA sets forth its proposed supplemental finding and requests comment on all aspects of that finding and the supporting legal memorandum in the docket for this action. This proposed supplemental finding, if finalized after consideration of comments, will conclude that coal- and oil-fired EGUs are properly included on the CAA section 112(c) list of sources that must be regulated under CAA section 112(d).","action":"Proposed supplemental finding and request for comment.","agencies":[{"raw_name":"ENVIRONMENTAL PROTECTION AGENCY","name":"Environmental Protection Agency","id":145,"url":"https://www.federalregister.gov/agencies/environmental-protection-agency","json_url":"https://www.federalregister.gov/api/v1/agencies/145","parent_id":null,"slug":"environmental-protection-agency"}],"body_html_url":"https://www.federalregister.gov/documents/full_text/html/2015/12/01/2015-30360.html","cfr_references":[{"chapter":null,"citation_url":null,"part":63,"title":40}],"citation":"80 FR 75025","comment_url":null,"comments_close_on":"2016-01-15","correction_of":null,"corrections":[],"dates":"Comments. Comments must be received on or before January 15, 2016.","disposition_notes":null,"docket_ids":["EPA-HQ-OAR-2009-0234","FRL-9939-45-OAR"],"dockets":[{"supporting_documents":[{"title":"Letter from Lee Zeugin, Hunton & Williams (on behalf of Utility Air Regulatory Group(UARG)), to Lisa Jackson, USEPA","document_id":"EPA-HQ-OAR-2009-0234-9859"},{"title":"Letter from Debra Jezouit, BakerBotts, to Robert J. Wayland, USEPA; Nickel Speciation Testing Conducted at Oil-FIred Electric Utility Steam Generating Units","document_id":"EPA-HQ-OAR-2009-0234-3072"},{"title":"OMB submittal (03/10/11)","document_id":"EPA-HQ-OAR-2009-0234-2996"},{"title":"OMB request (03/09/11)","document_id":"EPA-HQ-OAR-2009-0234-2994"},{"title":"Air Quality Modeling Technical Support Document: Point Source Sector Rules 2-1-2011","document_id":"EPA-HQ-OAR-2009-0234-2988"},{"title":"OMB request (02/28/11)","document_id":"EPA-HQ-OAR-2009-0234-2964"},{"title":"Planned and Projected Retirements","document_id":"EPA-HQ-OAR-2009-0234-2944"},{"title":"Non-Hg Case Study Chronic Inhalation Risk Assessment for the Utility MACT Appropriate and Necessary Analysis","document_id":"EPA-HQ-OAR-2009-0234-2939"},{"title":"The Cost of Mercury Removal from Coal-Based IGCC Relative to a PC Plant","document_id":"EPA-HQ-OAR-2009-0234-2936"},{"title":"AES Beaver Valley Plant Unit 2, Monaca, Pennsylvania, Process Data","document_id":"EPA-HQ-OAR-2009-0234-2722"}],"agency_name":"EPA","documents":[{"comment_count":43,"comment_start_date":"2015-12-01","updated_at":"2023-03-01T01:14:03.513-05:00","comment_url":"https://www.regulations.gov/commenton/EPA-HQ-OAR-2009-0234-20497","allow_late_comments":null,"id":"EPA-HQ-OAR-2009-0234-20497","comment_end_date":"2016-01-16","regulations_dot_gov_open_for_comment":false}],"supporting_documents_count":3622,"id":"EPA-HQ-OAR-2009-0234","title":"National Emission Standards for Hazardous Air Pollutants for Coal- and Oil-fired Electric Utility Steam Generating Units"}],"document_number":"2015-30360","effective_on":null,"end_page":75042,"executive_order_notes":null,"executive_order_number":null,"explanation":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2015/12/01/2015-30360.xml","html_url":"https://www.federalregister.gov/documents/2015/12/01/2015-30360/supplemental-finding-that-it-is-appropriate-and-necessary-to-regulate-hazardous-air-pollutants-from","images":{},"images_metadata":{},"json_url":"https://www.federalregister.gov/api/v1/documents/2015-30360?publication_date=2015-12-01","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2015-12-01/2015-30360/mods.xml","not_received_for_publication":null,"page_length":18,"page_views":{"count":718,"last_updated":"2026-04-04 14:15:05 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2015-12-01/pdf/2015-30360.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2015-30360.pdf?1448891154","publication_date":"2015-12-01","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2015/12/01/2015-30360.txt","regulation_id_number_info":{"2060-AS76":{"issue":"201510","html_url":"https://www.federalregister.gov/regulations/2060-AS76/considering-cost-in-appropriate-and-necessary-finding-for-the-mercury-and-air-toxics-standards-mats-","title":"Considering Cost in Appropriate and Necessary Finding for the Mercury and Air Toxics Standards (MATS)","xml_url":"http://www.reginfo.gov/public/do/eAgendaViewRule?pubId=201510&RIN=2060-AS76&operation=OPERATION_EXPORT_XML","priority_category":"Other Significant"}},"regulation_id_numbers":["2060-AS76"],"regulations_dot_gov_info":{"supporting_documents":[{"title":"Letter from Lee Zeugin, Hunton & Williams (on behalf of Utility Air Regulatory Group(UARG)), to Lisa Jackson, USEPA","document_id":"EPA-HQ-OAR-2009-0234-9859"},{"title":"Letter from Debra Jezouit, BakerBotts, to Robert J. 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