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Electric Utility Generating Units: Emission Guidelines for Greenhouse Gas Emissions from Existing Units

On this page:

  • Rule Summary
  • Rule History
  • Additional Resources

Rule Summary

Related Actions

Advance Notice of Proposed Rulemaking
In December 2017, EPA issued an Advance Notice of Proposed Rulemaking (ANPRM) to solicit information from the public about a potential future rulemaking to limit greenhouse gas emissions from existing electric utility generating units (EGUs), commonly called power plants.

Repealing the Clean Power Plan
In October 2017, EPA proposed to repeal the Clean Power Plan because it exceeded EPA's authority.

On August 21, 2018, the U.S. Environmental Protection Agency proposed the Affordable Clean Energy (ACE) rule which would establish emission guidelines for states to develop plans to address greenhouse gas emissions from existing coal-fired power plants. 

The ACE rule has several components: a determination of the best system of emission reduction for greenhouse gas emissions from coal-fired power plants, a list of “candidate technologies” states can use when developing their plans, a new preliminary applicability test for determining whether a physical or operational change made to a power plant may be a “major modification” triggering New Source Review, and new implementing regulations for emission guidelines under Clean Air Act section 111(d). 

    Rule History

    • 8/21/18 – Proposed rule

    Additional Resources

    • Fact Sheets and RIA on Proposed Affordable Clean Energy (ACE) Rule
    Contact Us to ask a question, provide feedback, or report a problem.
    Last updated on September 6, 2022
    United States Environmental Protection Agency

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