{"abstract":"This action responds to the U.S. Supreme Court decision in Michigan v. EPA, 135 S. Ct. 2699 (2015), and explains how the Environmental Protection Agency (EPA) has taken cost into account in evaluating whether 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). The EPA requested comment on all aspects of its approach to considering cost through a proposed supplemental finding and on a companion Legal Memorandum available in the rulemaking docket. After consideration of public comments, the EPA, in this final supplemental finding, concludes that a consideration of cost does not cause us to change our determination that regulation of hazardous air pollutant (HAP) emissions from coal- and oil-fired EGUs is appropriate and necessary and that EGUs are, therefore, properly included on the CAA section 112(c) list of sources that must be regulated under CAA section 112(d).","action":"Final supplemental finding.","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/2016/04/25/2016-09429.html","cfr_references":[{"chapter":null,"citation_url":null,"part":63,"title":40}],"citation":"81 FR 24420","comment_url":null,"comments_close_on":null,"correction_of":null,"corrections":[],"dates":"This final supplemental finding is effective on April 25, 2016.","disposition_notes":null,"docket_ids":["EPA-HQ-OAR-2009-0234","FRL-9945-33-OAR"],"dockets":[],"document_number":"2016-09429","effective_on":"2016-04-25","end_page":24452,"executive_order_notes":null,"executive_order_number":null,"full_text_xml_url":"https://www.federalregister.gov/documents/full_text/xml/2016/04/25/2016-09429.xml","html_url":"https://www.federalregister.gov/documents/2016/04/25/2016-09429/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/2016-09429?publication_date=2016-04-25","mods_url":"https://www.govinfo.gov/metadata/granule/FR-2016-04-25/2016-09429/mods.xml","not_received_for_publication":null,"page_length":33,"page_views":{"count":1892,"last_updated":"2026-08-26 10:15:07 -0400"},"pdf_url":"https://www.govinfo.gov/content/pkg/FR-2016-04-25/pdf/2016-09429.pdf","presidential_document_number":null,"proclamation_number":null,"public_inspection_pdf_url":"https://public-inspection.federalregister.gov/2016-09429.pdf?1461329128","publication_date":"2016-04-25","raw_text_url":"https://www.federalregister.gov/documents/full_text/text/2016/04/25/2016-09429.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. 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"}],"regulatory_plan":{"html_url":"https://www.federalregister.gov/regulations/2060-AP52/national-emission-standards-for-hazardous-air-pollutants-from-coal-and-oil-fired-electric-utility-st","title":"National Emission Standards for Hazardous Air Pollutants From Coal- and Oil-Fired Electric Utility Steam Generating Units and Standards of Performance for Electric Utility Steam Generating Units"},"comments_url":"https://www.regulations.gov/docketBrowser?rpp=50&so=DESC&sb=postedDate&po=0&dct=PS&D=EPA-HQ-OAR-2009-0234","supporting_documents_count":3622,"docket_id":"EPA-HQ-OAR-2009-0234","regulation_id_number":"2060-AP52","title":"National Emission Standards for Hazardous Air Pollutants for Coal- and Oil-fired Electric Utility Steam Generating Units","checked_regulationsdotgov_at":"2016-05-15T06:00:15Z"},"regulations_dot_gov_url":null,"significant":true,"signing_date":null,"start_page":24420,"subtype":null,"title":"Supplemental Finding That It Is Appropriate and Necessary To Regulate Hazardous Air Pollutants From Coal- and Oil-Fired Electric Utility Steam Generating Units","toc_doc":"Hazardous Air Pollutants from Coal- and Oil-Fired Electric Utility Steam Generating Units","toc_subject":null,"topics":[],"type":"Rule","volume":81}