Washington Attorney General Joins Multistate Lawsuit Challenging EPA Power Plant Carbon Rule Rollback

Washington Attorney General Nick Brown joined a multistate coalition of 25 attorneys general, cities, and counties on October 1 to file a federal lawsuit challenging the Trump administration's dismantling of greenhouse gas pollution limits on the nation's electric power sector. The lawsuit, filed in the U.S. Court of Appeals for the District of Columbia Circuit, asks the court to vacate the Environmental Protection Agency's September repeal of the 2024 Carbon Pollution Standards. Those federal rules had required high-capacity coal-fired generating units and newly built base-load natural gas facilities to install carbon capture technology capable of trapping 90 percent of emissions. Alongside the petition for review, the coalition issued a formal 60-day notice of intent to sue the EPA over what state attorneys described as an ongoing, decade-long statutory failure to regulate greenhouse gases produced by existing stationary gas-fired combustion turbines. Power generation accounts for roughly 25 percent of domestic carbon emissions, and state officials warned that removing federal ceilings leaves regional airsheds exposed to unchecked emissions from neighboring utility grids.

D.C. Circuit Petition Challenges Federal Rule Repeal

The coalition’s petition for review, designated as New York v. EPA in the D.C. Circuit, targets the federal agency’s decision to erase emission guidelines established under Section 111 of the Clean Air Act. According to filings submitted by the Washington State Office of the Attorney General, federal regulators unlawfully eliminated the 2024 standards without considering regulatory alternatives or calculating the economic and environmental consequences of unchecked industrial emissions. The legal challenge is led by New York Attorney General Letitia James and includes state attorneys general from California, Oregon, Illinois, Massachusetts, New Jersey, Pennsylvania, and 18 other jurisdictions, alongside municipal authorities representing Chicago, Denver, and New York City. The federal administration justified its September deregulation by claiming the rollback would save energy utilities approximately $370 million in compliance costs over the next decade. In response, state litigants pointed to the federal government's previous regulatory impact statement, which concluded that the 2024 rules would deliver $370 billion in net public health and climate benefits through 2047. The state petition contends that reversing federal standards based on compliance cost savings while ignoring statutory duties violates the arbitrary and capricious standard established by the Administrative Procedure Act. Under federal administrative law precedents, an agency changing course must provide a reasoned explanation for disregarding its prior factual findings. State attorneys plan to demonstrate that the EPA failed to establish an evidentiary record showing carbon capture and storage is unachievable for base-load generating units, making the wholesale repeal legally defective.

The 2024 Carbon Pollution Standards and the Regulatory Void

The repealed 2024 standards represented the third major federal attempt over twelve years to establish national carbon pollution limits for the electric power fleet. Initial efforts under the 2015 Clean Power Plan were stayed by the U.S. Supreme Court before being replaced in 2019 by the Affordable Clean Energy rule, which federal appellate judges subsequently struck down in 2021. The 2024 framework attempted to avoid earlier legal vulnerabilities by relying strictly on inside-the-fence technical controls, setting emission caps based on what power plants could achieve by applying carbon capture systems or co-firing cleaner fuels. According to analysis published by KING 5 News, the repealed framework had granted long-term coal facilities until 2032 to achieve compliance, establishing tailored pathways that varied based on projected operating lifetimes and generating capacity. The abrupt elimination of those guidelines leaves the electric generation sector without binding federal carbon limits for the first time in a decade. Washington officials emphasize that because the EPA has also proposed a complete exemption for power sector greenhouse gases, no federal backstop exists to prevent older thermal plants in adjacent states from burning cheap, high-emission fuels indefinitely. This regulatory vacuum complicates regional planning across the Western Interconnection, where utilities frequently buy and sell wholesale power through multi-state balancing authorities. While Washington enforces strict state-level caps through its Climate Commitment Act, electricity imported across state lines carries an embedded carbon footprint that state regulators struggle to police effectively when federal minimum baselines are abandoned.

Notice of Intent to Sue Over Existing Gas Combustion Turbines

While the court petition addresses the repeal of rules governing coal plants and new gas facilities, the coalition's accompanying notice of intent to sue targets a persistent regulatory omission. Under Clean Air Act Section 111(d), whenever the EPA establishes performance standards for newly constructed sources in an industrial category, the agency incurs a mandatory legal obligation to issue emission guidelines for existing facilities in that same category. The coalition noted that although federal regulators established standards for new gas turbines in 2015, the agency has deferred rules for existing gas facilities through three consecutive presidential administrations. Reporting from FOX 13 Seattle highlighted Attorney General Brown's contention that exempting existing natural gas turbines creates an expanding loophole as coal facilities retire nationwide. Existing natural gas plants currently supply over 40 percent of total domestic electricity generation and produce approximately 40 percent of all power sector carbon dioxide emissions. In Washington State, while hydroelectric dams supply the vast majority of base-load power, thermal combustion plants remain critical for peak winter heating demand. Facilities such as the Frederickson Generating Station in Pierce County and the Mint Farm Generating Station in Cowlitz County provide fast-ramping reliability when freezing conditions lower river flows and spike consumer demand. State utility regulators caution that without uniform federal emissions limits on existing combustion turbines, Western utilities face perverse economic incentives to extend the service lives of depreciated gas units rather than investing in grid-scale battery storage or regional transmission lines. The coalition asserts that allowing existing gas turbines to operate indefinitely without efficiency mandates penalizes states that invest in clean energy transitions while rewarding utilities that delay modernization.

Conflict Over the Centralia Coal Plant and Regional Grid Mandates

The federal rollback intersects directly with long-running legal and regulatory battles inside Washington State regarding the fate of the TransAlta Centralia Generation Station in Lewis County. Centralia is Washington's only commercial coal-fired power station, operating under an enforceable 2011 state agreement that mandated the closure of its first 670-megawatt unit in 2020 and scheduled the complete decommissioning of its second unit by the end of 2025. That planned retirement anchored Washington's statutory commitment under the Clean Energy Transformation Act of 2019, which requires all electric utilities operating within the state to eliminate coal-fired electricity from their customer portfolios by December 31, 2025. However, the federal Department of Energy intervened earlier this year by issuing emergency reliability orders directing TransAlta to keep its remaining Centralia boiler operational during peak periods, citing potential capacity shortfalls across the Pacific Northwest grid during extreme temperature anomalies. Attorney General Brown has repeatedly challenged those federal emergency orders in federal appellate court, arguing that federal agencies cannot commandeer state-regulated facilities to bypass state environmental statutes. The EPA's repeal of federal carbon capture requirements creates an additional layer of administrative conflict, as federal energy officials could cite the absence of federal pollution ceilings to justify prolonging Centralia's operations without requiring thermal retrofits or carbon sequestration investments. State officials counter that extending the lifespan of aging coal assets without pollution controls increases local sulfur dioxide and nitrogen oxide deposits across Lewis and Thurston counties while undermining regional emission benchmarks.

Health Risks and Air Quality Vulnerabilities Across Puget Sound

The legal challenge places heavy emphasis on the public health damages that stem from particulate matter, ozone, and sulfur compounds co-emitted alongside greenhouse gases. Under documentation published by the U.S. Environmental Protection Agency during its original 2024 rulemaking, the federal carbon standards were projected to prevent up to 1,200 premature deaths, 300,000 asthma attacks, and thousands of emergency room visits each year across the United States. In Washington, airborne pollutants from interstate utility operations drift across mountain corridors into Puget Sound valleys, concentrating in populated basins from Kitsap County through the Interstate 5 corridor. In Kitsap County, where maritime traffic through Sinclair Inlet interacts with regional atmospheric patterns, local air quality monitoring in Bremerton has documented elevated fine particulate concentrations during stagnant autumn temperature inversions. The Puget Sound Clean Air Agency has repeatedly noted that fine particulate matter smaller than 2.5 microns penetrates deep into lung tissue, exacerbating chronic bronchitis and cardiovascular complications among elderly residents and industrial shipyard workers. Epidemiological assessments from the Washington State Department of Health indicate that regional power emissions combine with coastal atmospheric moisture to elevate asthma hospitalization risks across port communities bordering Sinclair Inlet and the Port of Tacoma. State officials argue that deregulation disproportionately shifts the economic burden of utility pollution onto healthcare systems and municipal emergency services. Eliminating federal controls on out-of-state power generation guarantees that regional communities will continue absorbing cross-border pollution over which local air authorities have no direct permitting jurisdiction.

State Decarbonization Mandates Confront Federal Policy Reversals

The federal litigation highlights a widening structural divergence between Washington's aggressive statutory climate targets and federal energy deregulation. Under the Climate Commitment Act, Washington operates a comprehensive cap-and-invest program that requires major emitters, including electric generation stations and natural gas suppliers, to purchase carbon allowances for every metric ton of pollution they discharge. The revenue collected funds transit electrification, grid modernization, and forest restoration across all 39 counties. Concurrently, the state's Clean Energy Transformation Act requires utilities to reach 100 percent zero-carbon electricity by 2045. When the federal government dismantles baseline standards, Washington utilities face distorted market dynamics in the regional Western Energy Imbalance Market. Power suppliers located in states without carbon regulations can generate cheaper thermal electricity without investing in scrubbers or sequestration systems, undercutting clean generation and creating price disparities for Northwest ratepayers. The legal battle also carries profound fiscal consequences for Washington's state budget and public capital programs. Auction revenues generated under the Climate Commitment Act are explicitly earmarked by the Legislature to fund zero-emission ferry conversions, transit expansion, and local air monitoring networks across frontline communities. If federal policy shifts depress carbon market prices by allowing out-of-state polluters to flood regional grids with unregulated power, state auction receipts could fluctuate unexpectedly, jeopardizing planned infrastructure investments. Attorney General Brown emphasized that state attorneys are prepared to pursue their petition through every appellate stage to establish clear statutory limits on administrative deregulation, setting a decisive legal benchmark for state sovereignty and environmental administrative law.