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EPA/OAR RIN: 2060-AV09 Publication ID: Spring 2023 
Title: NSPS for GHG Emissions From New, Modified, and Reconstructed Fossil Fuel-Fired EGUs; Emission Guidelines for GHG Emissions From Existing Fossil Fuel-Fired EGUs; and Repeal of the ACE Rule 

Fossil fuel-fired electric generating units (EGUs) are the nation’s second largest source of greenhouse gas (GHG) pollution. Under CAA section 111(b), EPA sets New Source Performance Standards (NSPS) for new, modified, and reconstructed stationary sources. In 2015, EPA finalized regulations to limit GHG emissions from new fossil-fuel fired steam generating units (e.g., utility boilers) and from natural gas-fired stationary combustion turbines (40 CFR part 60 subpart TTTT). On August 3, 2015, EPA promulgated its first emission guideline regulating greenhouse gases (GHGs) from existing fossil fuel-fired electric generating units (EGUs) in the Clean Power Plan (CPP) (40 CFR part 60 UUUU), which was subsequently stayed by the U.S. Supreme Court. On June 19, 2019 EPA issued a new rule, the Affordable Clean Energy (ACE) Rule (40 CFR part 60, subpart UUUUa) and a repeal of the CPP. On January 19, 2021, the D.C. Circuit Court vacated the ACE Rule and remanded the rule to EPA for further consideration consistent with its decision. The U.S. Supreme Court then overturned the D.C. Circuit Court’s decision in the WV v EPA opinion in June 2022. EPA is now undertaking new rulemakings to amend the GHG NSPS under CAA section 111(b) and establish emission guidelines under CAA section 111(d) to limit GHG emissions from existing fossil fuel-fired EGUs. EPA anticipates issuing proposed rules for these actions in Spring 2023, and promulgating final rules by Spring 2024.

Agency: Environmental Protection Agency(EPA)  Priority: Section 3(f)(1) Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: Yes  Unfunded Mandates: No 
CFR Citation: 40 CFR 60, subpart TTTT     (To search for a specific CFR, visit the Code of Federal Regulations.)
Legal Authority: 42 U.S.C. 7411 Clean Air Act    42 U.S.C. 7414, 7601   
Legal Deadline:  None
Action Date FR Cite
NPRM  05/23/2023  88 FR 33240   
NPRM Comment Period End  07/24/2023 
Final Rule  04/00/2024 
Additional Information: .
Regulatory Flexibility Analysis Required: Undetermined  Government Levels Affected: Federal, State 
Federalism: Yes 
Energy Effects: Statement of Energy Effects planned as required by Executive Order 13211.  Included in the Regulatory Plan: No 
International Impacts: This regulatory action will be likely to have international trade and investment effects, or otherwise be of international interest.
RIN Information URL:  
Sectors Affected: 22111 Electric Power Generation; 221112 Fossil Fuel Electric Power Generation 
RIN Data Printed in the FR: No 
Related RINs: Related to 2060-AT56 
Agency Contact:
Christian Fellner
Environmental Protection Agency
Office of Air and Radiation
109 T.W. Alexander Drive, Mail Code D243-01,
Research Triangle Park, NC 27711
Phone:919 541-4003
Fax:919 541-4991

Nick Hutson
Environmental Protection Agency
Office of Air and Radiation
109 T.W. Alexander Drive, Mail Code D243-01,
Research Triangle Park, NC 27711
Phone:919 541-2968
Fax:919 541-4991