Emissions Budget and Allowance Allocations for Indiana Under the Revised Cross-State Air Pollution Rule Update

Document Headings Document headings vary by document type but may contain the following: the agency or agencies that issued and signed a document the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to the agency docket number / agency internal file number the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Environmental Protection Agency 40 CFR Part 97 [EPA-HQ-OAR-2025-0190; FRL-12724-01-OAR] RIN 2060-AW78 AGENCY: Environmental Protection Agency (EPA). ACTION: Interim final rule; request for comment. SUMMARY: The Environmental Protection Agency (EPA) is taking interim final action to adjust the Revised Cross-State Air Pollution Rule (CSAPR) Update “budget” for nitrogen oxides (NO X ) emissions from Indiana electricity generating units (EGUs) during the May-September “ozone season” for 2024 and subsequent years. Relatedly, EPA is also adjusting the default unit-level allocations of emission allowances to Indiana EGUs for 2024 and subsequent years in accordance with the adjustments to the state emissions budget. When originally establishing state emissions budgets and default unit-level allocations for 2024 and subsequent years in the Revised CSAPR Update rulemaking, EPA relied in part on announcements from EGU owners regarding their plans to retire certain EGUs before the 2024 ozone season. The purpose of the adjustments being made in this action is to account for the subsequent decisions by some EGU owners to defer or cancel the previously announced retirement plans. DATES: This interim final rule is effective May 20, 2025. Comments on this rule must be received on or before June 20, 2025. ADDRESSES: You may submit comments, identified by Docket ID No. EPA-HQ-OAR-2025-0190, at www.regulations.gov . Comments received may be posted without change to www.re…