On June 19, 2019, EPA issued the final Affordable Clean Energy rule (ACE) – replacing the prior administration’s overreaching Clean Power Plan with a rule that restores rule of law, empowers states, and supports energy diversity. The ACE rule establishes emission guidelines for states to use when developing plans to limit carbon dioxide (CO₂) at their coal-fired electric generating units (EGUs). In this notice, EPA also repealed the CPP, and issued new implementing regulations for ACE and future rules under section 111(d). 

On January 19, 2021, the D.C. Circuit vacated the Affordable Clean Energy rule and remanded to the Environmental Protection Agency for further proceedings consistent with its opinion.

• News Release

  • EPA Finalizes Affordable Clean Energy Rule, Ensuring Reliable, Diversified Energy Resources while Protecting our Environment

• Fact Sheets
  • Overview of the Final Affordable Clean Energy Rule
  • CO2 Emissions Trends
  • Overview of the Regulatory Impact Analysis
  • Repeal of the Clean Power Plan
  • Revised CAA Section 111(d) Implementing Regulations
• Federal Register Notice 
  • Repeal of the Clean Power Plan; Emission Guidelines for Greenhouse Gas Emissions from Existing Electric Utility Generating Units; Revisions to Emission Guidelines Implementing Regulations
• Regulatory Impact Analysis
  • RIA for the Repeal of the Clean Power Plan, and the Emission Guidelines for Greenhouse Gas Emissions from Existing Electric Utility Generating Units
  • Power Sector Analysis for the final ACE rule
• Presentation
  • Overview of ACE
• Implementation Resources
  • ACE Implementation Frequently Asked Questions