Illinois Sues EPA Over Reversal of Landmark Climate Change Ruling

State joins 24-state coalition challenging Trump administration's repeal of 'endangerment finding'

Apr. 10, 2026 at 10:43pm

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A cinematic painting of a lone coal power plant smokestack against a warm, golden sunset sky, with deep shadows across the foreground, conceptually illustrating the tension between federal and state climate policies.As federal climate policy shifts to favor fossil fuels, Illinois' transition to clean energy faces new legal and economic challenges.Bartonville Today

The state of Illinois has joined a 24-state coalition in suing the federal Environmental Protection Agency (EPA) over its decision to repeal the 'endangerment finding,' which provides the legal basis for regulating greenhouse gas emissions. Illinois officials and environmental groups fear this move could slow the state's transition to clean energy by creating economic incentives for coal-fired power plants to remain open.

Why it matters

The repeal of the endangerment finding means the federal EPA will no longer regulate dangerous emissions from sources like power plants. This could create economic incentives for coal-fired plants to remain open, potentially slowing Illinois' transition to cleaner energy sources and meeting its climate goals under the state's Clean and Equitable Jobs Act.

The details

Earlier this year, the Trump administration announced the repeal of the 'endangerment finding,' which provides the legal basis for federal regulations on greenhouse gas emissions. This move means the EPA will no longer regulate emissions from sources like power plants. Environmental groups fear this could change the economics for plant operators and slow planned closures of coal-fired plants in Illinois, even as the state has passed laws to transition to clean energy by 2030.

  • In February 2026, the Trump administration announced the repeal of the 'endangerment finding'.
  • On March 19, 2026, Illinois Attorney General Kwame Raoul filed a lawsuit against the federal EPA as part of a 24-state coalition.

The players

Kwame Raoul

The Illinois Attorney General who filed a lawsuit against the federal EPA over the repeal of the 'endangerment finding'.

JB Pritzker

The Governor of Illinois who has spoken out forcefully in opposition to the EPA's repeal of the 'endangerment finding'.

Cate Caldwell

The senior policy manager at the Illinois Environmental Council who says the state's clean energy law works best when federal policy supports, rather than diminishes, state climate progress.

Charlie Meier

A Republican state representative from Okawville, Illinois who supports the Trump administration's decision to repeal the 'endangerment finding'.

Ben Busser

The vice president of IBEW Local 15, a local utility union that represents workers from coal-fired power plants in Illinois, who hopes the new federal policies will extend the life of those plants.

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What they’re saying

“Rescinding this EPA determination will undo progress we have made to address climate change by eliminating existing EPA greenhouse gas emission standards for vehicles and undermining the EPA's mandate to regulate harmful air pollution that causes climate change.”

— Kwame Raoul, Illinois Attorney General

“While (Trump) sells out our nation's future, I won't stop believing in the science and fighting for what Illinoisans need — affordable energy, clean air and water and good jobs.”

— JB Pritzker, Governor of Illinois

“CEJA is a strong policy foundation for Illinois, but it works best when federal policy supports, rather than diminishes, state climate progress.”

— Cate Caldwell, Senior Policy Manager, Illinois Environmental Council

What’s next

The judge in the case will decide on Tuesday whether to grant a preliminary injunction to block the EPA's repeal of the 'endangerment finding' while the lawsuit proceeds.

The takeaway

This case highlights the tension between federal and state climate policies, as Illinois works to transition to clean energy in the face of a federal administration that is rolling back environmental regulations. The outcome of this lawsuit could have significant implications for the state's ability to meet its ambitious climate goals.