The EPA has finalized a suite of rules establishing emission limits and guidelines for carbon dioxide (CO2) from fossil fuel-fired power plants under the Clean Air Act. These rules focus on the adoption of feasible, cost-effective, and readily accessible control technologies. The finalized regulations are projected to achieve reductions in emissions of 50 MtCO2e by 2030 and 123 MtCO2e by 2035. In 2025, the EPA proposed to repeal these standards. The rescission of the 2009 Endangerment Finding in February 2026, which removes the EPA's legal authority to regulate GHG emissions, heightens the risk of federal power plant standards being overturned.