EPA Power Plant & Emissions Compliance Brief

Headline

EPA issues final rule partially repealing 2024 carbon pollution standards for fossil fuel-fired electric generating units

Executive Summary

The EPA published a final rule on September 17, 2026, repealing most provisions of the 2024 Carbon Pollution Standards for greenhouse gas emissions from fossil fuel-fired electric generating units. The rule removes emission guidelines for existing fossil fuel-fired steam generating units, CCS-based standards for coal-fired steam generating units undertaking large modifications, and Phase 2 CCS-based standards for new base load stationary combustion turbines.

Bottom Line

The EPA's final rule, effective November 16, 2026, repeals the emission guidelines for existing fossil fuel-fired steam generating units, the CCS-based standards for coal-fired steam generating units undertaking large modifications, and the Phase 2 CCS-based standards for new base load stationary combustion turbines under the 2024 Carbon Pollution Standards. A concurrent supplemental proposal, which remains in proposed status, solicits comment on rescinding all remaining greenhouse gas emission requirements for fossil fuel-fired electric generating units. Cresthaven reading: power generators, project developers, and capital markets participants with exposure to coal and gas-fired generation assets face a substantially altered federal GHG compliance framework as of the November 16, 2026 effective date, with further regulatory rollback under active agency consideration.

Key Regulatory Signals

• Emission Guidelines for Existing Steam Units Repealed: The final rule removes the emission guidelines that applied to existing fossil fuel-fired steam generating units under the 2024 Carbon Pollution Standards. Cresthaven reading: operators of existing coal and oil-fired steam generating units face a materially altered compliance posture as of the November 16, 2026 effective date.
• CCS-Based Standards for Coal Units Undergoing Large Modifications Repealed: The rule repeals the carbon capture and sequestration/storage standards that applied to coal-fired steam generating units undertaking a large modification. Operators planning or executing large capital modifications to coal-fired units no longer face those CCS-based requirements under this rule.
• Phase 2 Standards for New Base Load Combustion Turbines Repealed: The CCS-based standards for new base load stationary combustion turbines, designated as Phase 2 standards under the 2024 rule, are repealed by this final rule. New base load gas turbine projects that had been designed around Phase 2 compliance requirements are affected.
• Concurrent Supplemental Proposal Solicits Comment on Full Rescission: In a separate action published concurrently, the EPA is issuing a supplemental proposal soliciting comment on additional reasons to rescind all greenhouse gas emission requirements for fossil fuel-fired electric generating units. That action is proposed, not final; the current final rule addresses only the provisions enumerated above.
• Effective Date Set for November 16, 2026: The final rule takes effect on November 16, 2026. The Director of the Federal Register's approval for incorporation by reference of certain material listed in the rule also expires on that date.

Regulatory Delta

The 2024 Carbon Pollution Standards followed the EPA's prior Affordable Clean Energy rule and the vacated Clean Power Plan. This final rule marks another reversal of the agency's post-2015 approach to GHG emission reduction in the power sector.

The partial repeal rests on a reevaluation of the best system of emission reduction. A concurrent supplemental proposal signals that the EPA is pursuing a statutory reinterpretation of Clean Air Act section 111 that could eliminate all remaining GHG requirements for fossil fuel-fired generating units.

Materiality Classification

HIGH — Final rule with an effective date of November 16, 2026, repealing most provisions of the 2024 Carbon Pollution Standards for fossil fuel-fired electric generating units; a concurrent supplemental proposal signals further sector-wide GHG requirement rescission under active agency consideration.

Time Horizon

effective — 2026-11-16

Intelligence Outlook

Monitor EPA Federal Register publications and the docket for this rulemaking for a final action on the concurrent supplemental proposal to rescind all remaining greenhouse gas emission requirements for fossil fuel-fired electric generating units.