Company: EAI
Filing Date: 2025-08-01
Form Type: 10-Q
Source: 0000065984-25-000087
Chunk: 291

Company: ENTERGY ARKANSAS, LLC
Filing Date: 2025-08-01
Form: 10-Q
Item: Item 5
Chunk 291
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 in Column 2 until a supplemental inspection is satisfactorily completed.

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Table of Contents

Environmental Regulation

The following are updates to the “Environmental Regulation” section of Part I, Item 1 of the Form 10-K.

In March 2025 the EPA announced a series of deregulatory actions, including reconsideration of the particulate matter National Ambient Air Quality Standards (NAAQS), reconsideration of the Mercury and Air Toxics Standard (MATS) rule, reconsideration of greenhouse gas emissions rules, evaluation of whether to extend the compliance deadlines under the 2024 coal combustion residuals rule, and reconsideration of the effluent limitations guidelines.  Entergy continues to monitor the EPA’s reconsideration efforts.

National Ambient Air Quality Standards

See the Form 10-K for discussion of the NAAQS set by the EPA in accordance with the Clean Air Act.  The following are updates to that discussion.

Hazardous Air Pollutants

As discussed in the Form 10-K, the EPA released the final MATS rule in December 2011, which had a compliance date, with a widely granted one-year extension, of April 2016.  The required controls have been installed 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