EPA Dismantles GHG Rules Across Vehicles, Power and Methane

EPA rescinded the 2009 Endangerment Finding in February 2026 and, by October, had repealed or proposed to weaken greenhouse gas rules across vehicles, power plants and oil and gas operations — the country's two highest-emitting sectors plus its methane-leakiest one. Analysts at Harvard's Environmental and Energy Law Program walked through the full deregulatory sequence in the latest CleanLaw podcast, and their read matters for anyone tracking compliance deadlines or investment horizons in these sectors.

What did EPA actually do, sector by sector?

The moves split into three distinct legal postures, said Executive Director Carrie Jenks, Associate Director Sara Dewey and Senior Staff Attorney Erika Kranz.

• Vehicles: EPA rescinded the Endangerment Finding — not on scientific grounds, but on a new statutory interpretation. The agency argued greenhouse gases act only through long causal chains, and that regulating US vehicles "won't make a difference in global climate change." EPA simultaneously repealed the vehicle GHG standards and asserted it cannot issue new ones. Challenges from environmental, public health and state petitioners sit in the DC Circuit; briefing hasn't started.
• Power plants: In September, EPA rescinded most Biden-era standards built on 90% carbon capture rates and natural gas co-firing, calling CCS "not adequately demonstrated," too expensive and dependent on third-party infrastructure. A supplemental proposal takes comment on whether EPA has any authority under Clean Air Act Section 111 at all, aligned with the Endangerment Finding logic. Comments were due in early November.
• Methane: A comprehensive October proposal keeps regulating but loosens the OOOOB/OOOOC rules. It eliminates the Super Emitter Program, which let certified third parties report large leaks via satellites and aerial surveys, exempts low-producing "marginal" wells, and drops the requirement that new wells move associated gas to pipeline rather than flare it. Crucially, EPA does not dispute its authority to regulate methane here.

Why the methane split?

Jenks pointed to congressional history. Congress used the Congressional Review Act in 2021 to reject the first Trump administration's rule against regulating existing-source methane, and both the Inflation Reduction Act and the One Big Beautiful Bill kept the waste emission charge in place — strong evidence legislators presumed Section 111 authority. Oil and gas operators themselves have invested in leak-reduction infrastructure, and methane is the product they sell.

What happened to California's waivers?

EPA did something unprecedented: it treated California waiver decisions as "rules" and sent them to Congress for CRA veto — despite the GAO and Senate Parliamentarian concluding last summer they aren't rules. Congress vetoed three waivers last year; EPA proposed sending four more this year. A court entered a preliminary injunction blocking further transmittals, and EPA has appealed, arguing the CRA blocks judicial review. The CRA's bar on "substantially the same" future rules could block future waivers broadly.

Separately, the administration has proposed ending Greenhouse Gas Reporting Program data collection for all sectors except oil and gas, which would pause and resume years later.

What's at stake in Suncor v. Boulder?

Argued at the Supreme Court October 5, the case tests whether state tort claims and climate superfund laws are blocked by the Constitution or preempted by the Clean Air Act. Kranz flagged the internal tension: DOJ argues federal law occupies the field while EPA simultaneously claims no authority to regulate at all. Constitutional theories lead the government's brief. A Boulder win would send the case back to Colorado state court and shape dozens of pending state claims; a ruling on statutory grounds could be overridden by Congress, a constitutional one could not.

EPA also skipped quantifying health harms — notable given the agency valued the Biden rules' climate and health benefits at over $300 billion just two years ago — and asserted it needn't consider alternatives or reliance interests.

The milestones that decide what comes next: DC Circuit briefing on the Endangerment Finding, comments on the supplemental power plant authority proposal, finalization of the methane rollback, and a Suncor decision by next summer.