EPA Proposes to End Greenhouse Gas Limits for Power Plants
The Environmental Protection Agency has proposed eliminating the remaining federal limits on greenhouse gas pollution from U.S. power plants, while finalizing repeal of Biden-era requirements for the sector.
The agency described the two steps together. The finalized repeal covers the prior administration's power plant rules. The new proposal goes further and would remove what is left of greenhouse gas limits. EPA put the finalized repeal at $310 billion in savings, and the extra proposed removal at $370 million in direct compliance costs, according to The Verge.
The legal basis is Section 111 of the Clean Air Act, the provision that lets EPA set standards for specific categories of pollution sources. On June 11, 2025, EPA Administrator Lee Zeldin proposed to repeal all greenhouse gas standards for the power sector under that authority, as documented by the agency. A related agency fact sheet framed the core legal question as whether emissions from fossil fuel-fired power plants contribute significantly to dangerous air pollution, and proposed the answer is no.
Power plants account for a quarter of U.S. greenhouse gas emissions, second only to transportation. The Biden-era carbon rules now slated for repeal would have cut greenhouse gas emissions by 1 billion metric tons by 2047, according to Reuters.
A separate but related step concerns vehicles. The Trump administration overturned the greenhouse gas endangerment finding for vehicles, the formal determination that the pollution was dangerous enough to regulate under the Clean Air Act. That repeal would remove federal requirements for cars to measure, report, certify and comply with greenhouse gas emission standards, as reported in February.
For power plants, EPA said greenhouse gas pollution falls outside its scope to regulate because the effects are global and health harms are too uncertain to link specifically to the U.S. power sector. Limits on more conventional pollutants would not disappear entirely under the plan expected in September 2026. Plants would still face some limits on mercury, arsenic and other contaminants, according to The New York Times. For context, the administration had said in February it would weaken a rule on mercury and air toxics from coal plants. The September plan, as most recently described, keeps some of those contaminant limits while removing greenhouse gas limits.
The broader context here is regulatory structure rather than emissions chemistry. Section 111 rests on an endangerment and significance finding. Take away that finding and the standards built on it lose their legal footing, like a building losing its foundation. That is why the vehicle endangerment reversal and the power-sector significance proposal belong in the same story, even though they cover different sources and different compliance systems.
For operators and planners, the near-term result is compliance cost and permitting certainty. A fossil plant without a federal greenhouse gas standard must still control mercury, arsenic and other regulated contaminants, still meet state permits, and still sell into a grid where use depends on fuel cost, reliability rules and customer buying choices.
In my view, the durable question for technology professionals is not whether carbon accounting goes away, but where it moves. If federal measurement and reporting duties recede, tracking emissions performance shifts to voluntary disclosure, contract terms and state-level rules, which are less uniform and harder to build automated tools around.
