21 US States Sue EPA Over Repeal of Power Plant GHG Rules: What Remains Undecided

Why it matters: The US power sector is one of the country’s largest sources of carbon emissions. Removing federal GHG limits does not merely pause regulation; by proposing to rescind the underlying 2015 findings that GHG emissions from power plants endanger public health, the EPA is attempting to dismantle the legal foundation for any future federal emissions rules targeting this sector. The court battle will determine whether a regulatory agency can withdraw pollution limits without fully accounting for the health and climate costs of doing so, a precedent that extends well beyond this single rule.

What remains undecided, and what needs to happen

The states’ petition for review asks the court to strike down the repeal itself, but the outcome hinges on several open questions. First, the court must evaluate whether the EPA’s repeal was “arbitrary and capricious” under the Administrative Procedure Act, specifically whether the agency failed to consider reasonable alternatives and to calculate the full cost of removing the rules. Second, the states filed a separate notice of intent to sue the EPA for failing to regulate emissions from existing gas-fired power plants at all, a claim that could force the agency to act regardless of the repeal’s fate. Third, the proposed rescission of the 2015 Greenhouse Gas Findings is still in the proposal stage, not finalized. If finalized, it would face its own legal challenges, since it contradicts the EPA’s own prior scientific determinations. Until courts rule on both the repeal and any finalized rescission, the regulatory status of power plant GHG emissions remains in legal limbo.

Who gains and who loses

The immediate beneficiaries of the repeal are operators of existing coal-fired and natural gas power plants, particularly those that would have faced costly CCS retrofits or accelerated retirement timelines under the Biden-era rules. Industry groups that lobbied against the standards gain regulatory relief and reduced compliance costs. On the losing side are communities exposed to higher pollution levels near fossil fuel plants, states that had built their climate strategies around the expectation of federal emissions reductions, and the renewable energy and CCS technology sectors, which lose a regulatory driver that had been accelerating investment. Environmental and public health organizations also lose a key enforcement mechanism. The 21 states and additional local governments joining the lawsuit (including Arizona, California, Colorado, Connecticut, Delaware, Hawaii, Illinois, Maine, Maryland, Massachusetts, Michigan, Minnesota, New Jersey, New Mexico, North Carolina, Oregon, Rhode Island, Vermont, Washington, Wisconsin, the District of Columbia, the Governor of Pennsylvania, the Mayors of New York City and Chicago, and the City and County of Denver) are betting that courts will find the EPA overstepped by dismantling protections without adequate justification.

The structural risk: dismantling the legal basis

Beyond the immediate repeal, the more consequential move is the proposed rescission of the 2015 Greenhouse Gas Findings. If finalized, this would remove the scientific and legal determination that GHG emissions from power plants endanger public health, the very foundation upon which any Clean Air Act regulation of these emissions rests. EPA Administrator Lee Zeldin’s argument that power plant GHG emissions “do not contribute significantly to dangerous air pollution” directly contradicts years of the agency’s own scientific work. Should the rescission survive legal challenge, it would not just block the current rules from returning; it would require a future administration to rebuild the entire evidentiary and administrative record from scratch before imposing any new limits, a process that could take years. This makes the current litigation not just a fight over one set of rules, but over the structural capacity of the US federal government to regulate power sector emissions for the foreseeable future.

via ESG Today