EPA rolls back power plant emission rules: what it means for global carbon policy

Why it matters: The revocation dismantles the primary regulatory mechanism the US had to decarbonize its power grid. Because the United States is the world’s second-largest emitter, the decision sends a signal to international carbon markets and to countries that calibrate their own climate ambition partly in reference to US action. For economies building regulated carbon markets, including Brazil, the question is whether weakened US policy changes the calculus for domestic regulation or for the pricing of carbon credits traded internationally.

The endangerment finding: what is still undecided

The revocation of the 2024 emission standards is final, but the proposal to annul the “endangerment finding” is a separate, more consequential step that remains open. The endangerment finding, first issued in 2009 under the Obama administration, is the legal determination that greenhouse gases endanger public health and welfare. It is the foundation on which all EPA climate regulation rests. If annulled, no future administration could use the Clean Air Act to regulate CO2 from any source without first re-establishing the scientific and legal basis for doing so.

The proposal is now subject to a public comment period before any final rule can be issued. Legal challenges are expected from state attorneys general and environmental organizations, as courts have previously upheld the scientific basis of the finding. The outcome of these proceedings will determine whether the rollback is a temporary policy shift or a structural change to US environmental law.

Brazil’s parallel framework and why the comparison matters

Brazil regulates air pollutant emissions from thermoelectric plants through CONAMA (the National Environment Council) resolutions, and the country enacted Law 15.042 in December 2024, creating its regulated carbon market (SBCE). The two systems differ in a fundamental way: while the US approach relied on command-and-control emission standards (requiring specific technologies like carbon capture), Brazil’s SBCE is designed as a cap-and-trade system that will set aggregate emission ceilings and let regulated entities trade allowances to meet them. The Brazilian framework is still in its implementation phase, with detailed rules for covered sectors yet to be finalized by the Ministry of the Environment.

Brazil’s electricity matrix is predominantly renewable, with hydroelectric, wind, and solar providing most of the generation. Thermoelectric plants fueled by natural gas and, to a lesser extent, coal (concentrated in the southern states) operate primarily as backup during dry seasons or peak demand. This structural difference means Brazil’s power sector is not the largest emission concern domestically. However, as data center demand grows in Brazil, as it does in the US, the dispatch of gas-fired plants could increase, making the regulatory treatment of these facilities more relevant over time.

Who gains and who loses

The immediate beneficiaries are US coal and gas plant operators, who no longer face deadlines to install carbon capture technology or shut down. Companies that had invested in CCS development lose a guaranteed market for their technology, since the mandate that would have driven adoption has been removed. Utilities planning new gas-fired capacity to serve data centers and industrial load gain regulatory certainty in the short term, but face the risk that a future administration reinstates or strengthens emission rules, potentially stranding assets built under the current permissive regime.

For Brazilian energy companies, the direct operational impact is limited, but the indirect effects are not. Petrobras and other operators of gas-fired plants in Brazil still face domestic regulation under CONAMA and, eventually, the SBCE. If the US withdrawal from emission controls weakens global momentum on carbon pricing, it could reduce the international demand for carbon credits, a market where Brazil holds significant potential through its forestry and land-use sectors. Conversely, if other jurisdictions (the EU, for instance) respond by tightening their own carbon border mechanisms, Brazilian exporters to those markets may face stricter requirements regardless of what the US does.

The decision also complicates the G20 climate agenda. The announcement was made at a G20 energy ministers meeting in Houston, framed around “energy abundance.” Brazil, which held the G20 presidency in 2024, had pushed for stronger climate language in the group’s communiques. The US posture makes consensus on emissions-related commitments harder to achieve in future G20 rounds.

via Reset