The Environmental Protection Agency announced the repeal of federal limits on greenhouse gas emissions from coal and natural gas power plants, eliminating one of the Biden administration's signature climate regulatory efforts. The rollback removes requirements that had compelled power plant operators to reduce carbon dioxide output or adopt cleaner technologies over time.

The repealed rules were widely regarded as among the most consequential federal climate regulations in recent years, targeting the electricity generation sector, which remains one of the largest sources of greenhouse gas emissions in the United States. The Biden-era regulations had set enforceable standards intended to accelerate the transition away from fossil fuels in power generation.

The Trump administration framed the repeal as a necessary correction to overreaching federal regulation, arguing the previous rules imposed undue burdens on energy producers and threatened grid reliability. Officials contended that the rules would have raised electricity costs for consumers and undermined domestic energy production goals.

Environmental groups and a number of Democratic-led states have signaled they intend to challenge the repeal in court, arguing the EPA is legally required to regulate greenhouse gas emissions under the Clean Air Act following the Supreme Court's 2007 Massachusetts v. EPA ruling. Legal analysts expect prolonged litigation over the agency's authority to rescind the standards without adequate justification.

The repeal is part of a broader effort by the current administration to undo a range of environmental rules established over the previous four years. Energy industry representatives welcomed the decision, saying it removes regulatory uncertainty and allows power companies greater flexibility in managing their generating fleets.