Company: EAI
Filing Date: 2025-10-31
Form Type: 10-Q
Source: 0000065984-25-000132
Chunk: 123

Company: ENTERGY ARKANSAS, LLC
Filing Date: 2025-10-31
Form: 10-Q
Item: Item 3
Chunk 123
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 and are operational at all affected Entergy units.  In May 2024 the EPA issued a final rule revising portions of the MATS rule, including a reduction to the emission limit for filterable particulate matter.  The revised standard will become effective July 2027 and could require additional capital investment and/or additional other operation and maintenance costs at Entergy’s coal-fired generating units.  In March 2025, as part of its deregulatory agenda, the EPA announced that it was reconsidering the May 2024 MATS rule and that sources interested in a presidential exemption (two years, with additional exemptions available) should provide a recommendation to the EPA by March 31, 2025.  Clean Air Act Section 112(i)(4) grants the President authority to issue an exemption if he determines that “the technology to implement such standard is not available and that it is in the national security interests of the United States to do so.”  Entergy requested and received presidential exemptions for emissions of filterable particulate matter from Nelson Unit 6 and White Bluff Unit 1.  The exemption lasts for a period of two years beyond the rule’s compliance date, i.e., from July 8, 2027 through July 8, 2029.  Additionally, in June 2025, the EPA proposed to repeal certain aspects of the May 2024 MATS rule including the revised emission limit for filterable particulate matter for which the presidential exemption was granted.  Comments on the proposed rule were due August 2025, and the EPA is expected to finalize the rule by the end of 2025.

Good Neighbor Plan/Cross-State Air Pollution Rule

As discussed in the Form 10-K, in June 2023 the EPA published its final Federal Implementation Plan (FIP), known as the Good Neighbor Plan, to address interstate transport for the 2015 ozone NAAQS which would increase the stringency of the Cross-State Air Pollution Rule (CSAPR) program in all four of the states where the Utility operating companies operate.  The FIP would significantly reduce ozone season nitrogen oxides (NOx) emission allowance budgets and allocations for electric generating units.  Prior to issuance of the FIP, in February 

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2023 the EPA issued related State Implementation Plan (SIP) disapprovals for many states, including the four states in which the Utility operating companies operate, and these SIP disapprovals are the subject of many legal challenges, including a petition for review