Company: EAI
Filing Date: 2025-02-18
Form Type: 10-K
Source: 0000065984-25-000012
Chunk: 766

Company: ENTERGY ARKANSAS, LLC
Filing Date: 2025-02-18
Form: 10-K
Item: Item 7
Chunk 766
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 for ozone, carbon monoxide, lead, nitrogen dioxide, particulate matter, and sulfur dioxide and requires periodic review of those standards.  When an area fails to meet an ambient standard, it is considered to be in nonattainment and is classified as “marginal,” “moderate,” “serious,” or “severe.”  When an area fails to meet the ambient air standard, the EPA 

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Table of ContentsPart I Item 1Entergy Corporation, Utility operating companies, and System Energy

requires state regulatory authorities to prepare state implementation plans meant to cause progress toward bringing the area into attainment with applicable standards.

Ozone Nonattainment

Entergy Texas operates two fossil-fueled generating facilities (Lewis Creek and Montgomery County Power Station) in a geographic area that is not in attainment with the applicable NAAQS for ozone.  The ozone nonattainment area that affects Entergy Texas is the Houston-Galveston-Brazoria area.  Both Lewis Creek and the Montgomery County Power Station hold all necessary permits for operation and comply with applicable air quality program regulations.  Measures enacted to return the area to ozone attainment could make these program regulations more stringent.  Entergy will continue to work with state environmental agencies on appropriate methods for assessing attainment and nonattainment with the ozone NAAQS.

Revised Fine Particulate (PM2.5) NAAQS

In March 2024 the EPA issued a final rule which revised the primary annual NAAQS for fine particulate matter, also known as PM2.5, from 12 ug/m3 to 9 ug/m3.  This new standard was effective May 2024 and initial attainment/nonattainment designations for areas with available information are due within two years, by May 2026.  For any areas designated as nonattainment for this revised standard, State Implementation Plans (SIPs) to address nonattainment requirements will be due within 18 months of the effective date of any initial nonattainment designations.  Within the areas in which the Utility operating companies operate, regulatory agency air monitor data from 2021-2023 for Pulaski County and Union County, Arkansas, West Baton Rouge Parish, Louisiana, Harris County, Texas and Hinds County, Mississippi reflect annual average PM2.5 concentrations in excess of this new standard and monitors for several other areas reflect concentrations between 8-9 ug/m3.  Initial attainment and nonattainment designations will be based on data from