Document m7DXMGZLw3KD1BeY6095N88Q

USCA Case #24-1190 Document #2062093 Filed: 06/27/2024 Page 3 of 123 revision to the original MATS Rule promulgated in 2012). I assisted in the development of these comments ("NorthWestern MATS2 Comments")). A copy of the NorthWestern MAIS2 Comments is attached as Exhibit A. 5. On August 8, 2023, NorthWestern also provided comments on the New Source Performance Standards for Greenhouse Gas Emissions From New, Modified, and Reconstructed Fossil Fuel-Fired Electric Generating Units; Emission Guidelines for Greenhouse Gas Emissions From Existing Fossil Fuel-Fired Electric Generating Units; and Repeal of the Affordable Clean Energy Rule. 'Ile proposal was published in the Federal Register at 88 Fcd. Reg. 33,240 (May 23, 2023). I assisted in the development of these comments ("NorthWestern GIIC; Rule Comments"). A copy of the NorthWestern GHG Rule Comments is attached as Exhibit B (omitting exhibits that are duplicative of the exhibits to the NorthWestern MATS2 Comments). 6. On December 20, 2023, NorthWestern also provided comments on the Initial Regulatory Flexibility Analysis ("IRFA") on reliability concerns arising from EPA's proposed New Source Performance Standards for Greenhouse Gas Emissions From New. Modified, and Reconstructed Fossil Fuel-Fired Electric Generating Units; Emission Guidelines for Greenhouse Gas Emissions From Existing Fossil Fuel-Fired Electric Generating Units ("ECUs"); and Repeal of the Affordable Clean Energy Rule. The rule proposal was published in the Federal 1?egister at 88 Fed. Reg. 33,240 (May 23, 2023) ("Proposed Rule"), and the solicitation for supplemental comments on the IRFA was published in the Federal Register at 88 Fed. Reg. 80,662 (Nov. 20, 2023) ("NorthWestern Supplemental Reliability Comments"). I assisted in the development of the NorthWestern Supplemental Reliability Comments, and I also provided a declaration in support of the comments. A copy of the NorthWestern Supplemental Reliability Comments is attached as Exhibit C (again omitting exhibits duplicative of those in Exhibits A and B). 2 Sierra Club FOIA 2025-EPA-04883 ED_018388_00000310-00003 SC_EVERSPLIT0006258