What is the primary reason the U.S. Supreme Court limited the Environmental Protection Agency’s authority to regulate greenhouse gas emissions from power plants?

The Democratic Party, to which President Biden belongs, has consistently prioritized carbon emission reductions to combat climate change—this being one of Biden’s signature policy initiatives. Yet the U.S. Supreme Court, currently dominated by conservative justices, recently issued a ruling that effectively nullified federal agencies’ authority to impose carbon emission limits on power plants. This decision further constrains the United States’ capacity to pursue carbon reduction goals, plunging America’s climate targets into a state of severe difficulty. This article provides a comprehensive analysis of this development—and of the deepening domestic polarization now spreading across the United States. (1) Background and Chronology Upon taking office, President Biden swiftly rejoined the Paris Agreement and launched an ambitious carbon-reduction agenda. Among its key components was imposing carbon dioxide emission limits on coal-fired power plants, requiring their emissions not to exceed specified thresholds. Such limits would compel some coal-fired plants to abandon coal in favor of natural gas—a fuel with comparatively lower carbon emissions. Currently, coal accounts for 20% of U.S. electricity generation; however, last year saw coal’s share rise to 23%. This directly contributed to a 6.2% year-on-year increase in U.S. greenhouse gas emissions in 2021. Thus, despite Biden’s constant rhetoric on carbon reduction, U.S. emissions surged sharply during his first year in office—undermining his credibility and political standing. Accordingly, the Biden administration plans to impose broad, stringent carbon emission limits on power plants this year. However, many power plants strongly oppose such measures. Last year’s rise in coal-fired generation stemmed from the global energy crisis and the sharp spike in natural gas prices. In 2020, natural gas accounted for 40% of U.S. electricity generation—but dropped to 36% in 2021, primarily due to soaring natural gas prices. Consequently, some power companies opted for cheaper coal instead—driving up coal’s share while reducing natural gas’s. Now, Biden’s proposed emission limits would force certain utilities to switch from coal to more expensive natural gas—potentially eroding their profitability or even pushing them into losses. Naturally, these companies resist. Accordingly, earlier this year, 19 Republican-led states—as well as several major U.S. coal companies—sued the Environmental Protection Agency (EPA), arguing that the EPA lacks statutory authority to broadly restrict power plant carbon emissions. These 19 states contend that sweeping, far-reaching policies must originate from Congress—not from administrative agencies or regulatory bodies. The lawsuit ultimately reached the U.S. Supreme Court, which ruled against the Biden administration. The Court held that the Clean Air Act does not grant the EPA broad authority to regulate greenhouse gas emissions from power plants. In other words, if Biden wishes to implement comprehensive emission restrictions, he must rely on new legislation passed by Congress—not on executive branch authority alone. Biden has already directed his White House team to explore alternative pathways for addressing carbon emissions. One major initiative involves issuing, before year-end, a new EPA proposal regulating power plant emissions. But a new complication arises: the U.S. midterm elections are scheduled for November. Currently, Democrats hold majorities in both chambers of Congress—making it easier for Biden to advance legislation favorable to his administration.

Whose authority determines what kind of electricity to use—the federal government or individual states?

The Act authorizes both the federal government and state governments to set emission standards for stationary and mobile sources. It established four enduring foundational principles for air pollution control: ● Establishing nationwide ambient air quality standards; ● Requiring each state to submit a State Implementation Plan (SIP) designed to achieve those national standards; ● Applying new source performance standards to newly constructed emission sources; ● Setting national emission standards for hazardous air pollutants. The Act was most recently amended in 1990—but that revision did not include carbon dioxide among the regulated pollutants. In 2007, during George W. Bush’s presidency, the Supreme Court ruled that the EPA possesses the authority under the Clean Air Act to regulate carbon dioxide and other greenhouse gases—fulfilling its statutory mandate to protect public health and the environment. Relying precisely on that 2007 ruling, the Obama administration introduced the Clean Power Plan (CPP). The CPP formed the centerpiece of the 2015 President’s Climate Action Plan, issued during Obama’s second term: using executive authority, the White House required all states to submit implementation plans within three years—plans aimed at improving existing power plants’ efficiency, reducing emissions, or integrating renewable energy generation. The EPA would review and approve these plans, thereby controlling carbon emissions from the power sector and achieving a target of cutting power-sector emissions by 32% below 2005 levels by 2030. To implement the plan, the core mechanism was the EPA’s statutorily delegated authority—leveraged to drive rapid decarbonization—or even full zero-carbon transition—across the nation’s electricity systems. After Donald Trump’s election, he promptly repealed the Clean Power Plan and replaced it with a new regulation: the Affordable Clean Energy (ACE) Rule. Under ACE, the target was revised to a mere 0.7%–1.5% reduction in coal-plant emissions relative to 2005 levels by 2030—a dramatically weakened goal. The Biden administration has revived Obama-era approaches toward coal-fired power plants, similarly seeking to wield executive authority—and the EPA’s regulatory powers—to manage and constrain carbon emissions from coal plants nationwide, aiming to achieve a zero-carbon electricity grid by 2035. This objective lies at the heart of West Virginia’s lawsuit against the EPA. Led by West Virginia, twenty states and multiple power companies challenged a D.C. Circuit Court ruling, arguing that it conferred excessive emission-regulatory authority upon the EPA. In fact, during the Obama era, dozens of states sued, claiming the Clean Power Plan was unconstitutional. In 2016, the Supreme Court suspended the plan. During the Trump era, opponents of climate action gained renewed momentum and influence. And under the Biden administration, this anti-climate coalition remains highly active and effective. In the current case, joining West Virginia’s appeal were Alabama, Alaska, Arkansas, Georgia, Indiana, Kansas, Louisiana, Missouri, Mississippi, Montana, Nebraska, North Dakota, Ohio, Oklahoma, South Carolina, South Dakota, Texas, Utah, and Wyoming—as well as Westmoreland Mining Holdings, North American Coal Corporation, and other companies.

New York, 20 States Sue EPA to Block Power Plant Carbon Rule Repeal

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A coalition of 25 US states sued the EPA to block the repeal of 2024 carbon pollution standards requiring power plants to install carbon capture technology. They argue the revocation ignores significant health and climate costs while increasing emissions.

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New York, 20 States Sue EPA to Block Power Plant Carbon Rule Repeal

New York, 20 States Sue EPA to Block Power Plant Carbon Rule Repeal

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