Air Plan Approval; Wyoming; Revisions to Regional Haze State Implementation Plan

ENVIRONMENTAL PROTECTION AGENCY <CFR>40 CFR Part 52</CFR> <DEPDOC>[EPA-R08-OAR-2022-0536; FRL-11829-01-R8]</DEPDOC> <SUBJECT>Air Plan Approval; Wyoming; Revisions to Regional Haze State Implementation Plan</SUBJECT> <HD SOURCE="HED">AGENCY:</HD> Environmental Protection Agency (EPA). <HD SOURCE="HED">ACTION:</HD> Proposed rule. <SUM> <HD SOURCE="HED">SUMMARY:</HD> The Environmental Protection Agency (EPA) is proposing to approve a State Implementation Plan (SIP) revision submitted by the State of Wyoming on December 30, 2022, and supplemented on August 31, 2023, and November 16, 2023, addressing regional haze (Wyoming 2022 SIP revision). The Wyoming 2022 SIP revision replaces Wyoming's previously approved source-specific nitrogen oxide (NO <E T="52">X</E> ) determination for PacifiCorp's Jim Bridger power plant (Jim Bridger) Units 1 and 2 of 0.07 lb/MMBtu for each unit associated with the installation of selective catalytic reduction (SCR) controls to address the long-term strategy. Specifically, the Wyoming 2022 SIP revision finds that conversion from coal-firing to natural gas-firing, together with NO <E T="52">X</E> emission and heat input limits of 0.12 lb/MMBtu (30-day rolling average), 1,314 tons/year, and 21,900,000 MMBtu/year, respectively, allows for identical reasonable progress during the first planning period as the installation SCR controls. Separately, we are also proposing to approve Wyoming's monthly and annual NO <E T="52">X</E> and sulfur dioxide (SO <E T="52">2</E> ) emissions limits for Jim Bridger Units 1-4. The EPA is proposing this action pursuant to sections 110 and 169A of the Clean Air Act (CAA). </SUM> <EFFDATE> <HD SOURCE="HED">DATES:</HD> <E T="03">Comments:</E> Written comments must be received on or before May 10, 2024. </EFFDATE> <HD SOURCE="HED">ADDRESSES:</HD> Submit your comments, identified by Docket ID No. EPA-R08-OAR-2022-0536, to the Federal Rulemaking Portal: <E T="03">https://www.regulations.gov.</E> Follow the online instructions for submitting comments. Once submitted, comments cannot be edited or removed from <E T="03">https://www.regulations.gov.</E> The EPA may publish any comment received to its public docket. Do not submit electronically any information you consider to be Confidential Business Information (CBI) or other information whose disclosure is restricted by statute. Multimedia submissions (audio, video, etc.) must be accompanied by a written comment. The written comment is considered the official comment and should include discussion of all points you wish to make. The EPA will generally not consider comments or comment contents located outside of the primary submission ( <E T="03">i.e.,</E> on the web, cloud, or other file sharing system). For additional submission methods, the full EPA public comment policy, information about CBI or multimedia submissions, and general guidance on making effective comments, please visit <E T="03">https://www.epa.gov/dockets/commenting-epa-dockets.</E> <E T="03">Docket:</E> All documents in the docket are listed in the <E T="03">https://www.regulations.gov</E> index. Although listed in the index, some information is not publicly available, <E T="03">e.g.,</E> CBI or other information whose disclosure is restricted by statute. Certain other material, such as copyrighted material, will be publicly available only in hard copy. Publicly available docket materials are available electronically in <E T="03">https://www.regulations.gov.</E> Please email or call the person listed in the <E T="02">FOR FURTHER INFORMATION CONTACT</E> section if you need to make alternative arrangements for access to the docket. <FURINF> <HD SOURCE="HED">FOR FURTHER INFORMATION CONTACT:</HD> Jaslyn Dobrahner, Air and Radiation Division, EPA, Region 8, Mailcode 8P-ARD, 1595 Wynkoop Street, Denver, Colorado 80202-1129, telephone number: (303) 312-6252, email address: <E T="03">dobrahner.jaslyn@epa.gov.</E> </FURINF> <SUPLINF> <HD SOURCE="HED">SUPPLEMENTARY INFORMATION:</HD> Throughout this document wherever “we,” “us,” or “our” is used, we mean the EPA. <EXTRACT> <FP SOURCE="FP-2">I. What action is the EPA proposing?</FP> <FP SOURCE="FP-2">II. Background</FP> <FP SOURCE="FP1-2">A. Requirements of the Clean Air Act and the EPA's Regional Haze Rule</FP> <FP SOURCE="FP1-2">B. Best Available Retrofit Technology (BART)</FP> <FP SOURCE="FP1-2">C. Long-Term Strategy and Reasonable Progress Requirements</FP> <FP SOURCE="FP1-2">D. Consultation With Federal Land Managers (FLMs)</FP> <FP SOURCE="FP1-2">E. Monitoring, Recordkeeping, and Reporting</FP> <FP SOURCE="FP-2">III. Wyoming's Regional Haze SIP Submittals</FP> <FP SOURCE="FP1-2">A. Background and Wyoming's Initial Regional Haze SIP</FP> <FP SOURCE="FP1-2">B. November 2017 Regional Haze Progress Report</FP> <FP SOURCE="FP1-2">C. May 2020 Regional Haze SIP Revision</FP> <FP SOURCE="FP1-2">D. December 2022 Regional Haze SIP Revision</FP> <FP SOURCE="FP1-2">E. Wyoming's Reassessment of Reasonable Progress Under Long-Term Strategy</FP> <FP SOURCE="FP1-2">1. Costs of Compliance</FP> <FP SOURCE="FP1-2">2. Time Necessary for Compliance</FP> <FP SOURCE="FP1-2">3. Energy and Non-Air Quality Environmental Impacts of Compliance</FP> <FP SOURCE="FP1-2">4. Remaining Useful Life</FP> <FP SOURCE="FP1-2">5. Reasonable Progress Demonstration</FP> <FP SOURCE="FP1-2">F. Summary of Wyoming's Additional Proposed Revisions to the Emission Limits for Jim Bridger</FP> <FP SOURCE="FP-2">IV. The EPA's Evaluation and Proposed Approval of Wyoming's Regional Haze SIP Revisions</FP> <FP SOURCE="FP1-2">A. The EPA's Proposed Approval of Wyoming's Reasonable Progress Determination for Jim Bridger Units 1 and 2</FP> <FP SOURCE="FP1-2">1. Basis for the EPA's Proposed Approval</FP> <FP SOURCE="FP1-2">a. Costs of Compliance</FP> <FP SOURCE="FP1-2">b. Other Statutory Factors</FP> <FP SOURCE="FP1-2">c. Analysis of Projected Emissions Reductions Achievable</FP> <FP SOURCE="FP1-2">2. Summary of the EPA's Evaluation of Wyoming's Reasonable Progress Demonstration</FP> <FP SOURCE="FP1-2">B. The EPA's Proposed Approval of Wyoming's Long-Term Strategy for Jim Bridger Units 1 and 2</FP> <FP SOURCE="FP1-2"> C. Monthly and Annual NO <E T="52">X</E> and SO <E T="52">2</E> Emission Limits for Jim Bridger Units 1-4 </FP> <FP SOURCE="FP1-2">D. Monitoring, Recordkeeping, and Reporting</FP> <FP SOURCE="FP1-2">E. Consultation With Federal Land Managers</FP> <FP SOURCE="FP-2"> V. Clean Air Act Section 110( <E T="03">l</E> ) </FP> <FP SOURCE="FP-2">VI. Summary of the EPA's Proposed Action</FP> <FP SOURCE="FP-2">VII. Incorporation by Reference</FP> <FP SOURCE="FP-2">VIII. Statutory and Executive Order Reviews</FP> </EXTRACT> <HD SOURCE="HD1">I. What action is the EPA proposing?</HD> The Jim Bridger power plant is located in Sweetwater County, Wyoming, and is owned in part, and operated, by PacifiCorp. The power plant is composed of four 530 megawatt (MW) tangentially fired boilers burning pulverized coal for a total net generating capacity of 2,120 MW. On January 30, 2014, the EPA promulgated a final rule titled, “Approval, Disapproval and Promulgation of Implementation Plans; State of Wyoming; Regional Haze State Implementation Plan; Federal Implementation Plan for Regional Haze,” approving, in part, a regional haze SIP revision submitted by the State of Wyoming on January 12, 2011 (2014 final rule). <SU>1</SU> <FTREF/> In the 2014 final rule, the EPA approved Wyoming's determination to require low-NO <E T="52">X</E> burners (LNB) and separated overfire air (SOFA) at Jim Bridger Units 1-4, with a NO <E T="52">X</E> best available retrofit technology (BART) emission limit of 0.26 pounds per million British Thermal Units (lb/MMBtu) (30-day rolling average) for Jim Bridger Units 1-4. <SU>2</SU> <FTREF/> The EPA also approved Wyoming's determination to require SCR at Jim Bridger Units 1-4, with a NO <E T="52">X</E> emission limit of 0.07 lb/MMBtu (30-day rolling average), as part of its long-term strategy. <SU>3</SU> <FTREF/> <FTNT> <SU>1</SU>  79 FR 5032 (January 30, 2014). </FTNT> <FTNT> <SU>2</SU>  Wyoming determined that all four units are subject to BART. 77 FR 33022, 33030, 33035 (June 4, 2012). </FTNT> <FTNT> <SU>3</SU>  The BART determination compliance date for all units was March 4, 2019. Long-term strategy determination compliance dates for each include: Unit 1 = December 31, 2022; Unit 2 = December 31, 2021; Unit 3 = December 31, 2015; and Unit 4 = December 31, 2016. </FTNT> The EPA is proposing to approve a SIP revision submitted by the State to the EPA on December 30, 2022, and supplemented on August 31, 2023, and November 16, 2023, which will replace the previously approved NO <E T="52">X</E> emission limit of 0.07 lb/MMBtu (30-day rolling average) at Jim Bridger Units 1 and 2 for Wyoming's long-term strategy. <SU>4</SU> <FTREF/> The Wyoming 2022 SIP revision amends the State's previously approved long-term strategy for the first Regional Haze planning period and is requiring Jim Bridger Units 1 and 2 to operate consistent with conversion from coal-firing to natural gas-firing by January 1, 2024, with NO <E T="52">X</E> emission limits of 0.12 lb/MMBtu (30-day rolling average) and 1,314 tons/year for each unit and a heat input limit of 21,900,000 MMBtu/year per unit. The Wyoming 2022 SIP revision reflects changes to Chapters 7 and 8 of Wyoming's regional haze SIP narrative  <SU>5</SU> <FTREF/> and incorporates certain conditions of Wyoming air quality permits #P0025809 and #P0036941, some conditions of which were memorialized in a Wyoming court-approved consent decree between Wyoming and PacifiCorp. <E T="51">6 7</E> <FTREF/> Ultimately, the Wyoming 2022 SIP revision finds conversion from coal-firing to natural gas-firing, together with NO <E T="5 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Preview showing 10k of 122k characters. Full document text is stored and available for version comparison. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━