The Clean Power Plan was an Obama administration policy aimed at combating climate change that was first proposed by the Environmental Protection Agency (EPA) in June 2014.[1] The final version of the plan was unveiled by President Barack Obama on August 3, 2015.[2] Each state was assigned an individual goal for reducing carbon emissions, which could be accomplished how they saw fit, but with the possibility of the EPA stepping in if the state refused to submit a plan.[3] If every state met its target, the plan was projected to reduce carbon emissions from electricity generation 32% by 2030, relative to 2005 levels, as well as achieving various health benefits due to reduced air pollution.
In 2017, President Donald Trump signed an executive order mandating that the EPA review the plan,[4][5][6][7] and withdrew the United States from the Paris Agreement.[8][9][10] Trump-appointed EPA administrator Scott Pruitt announced the formal process to repeal the Clean Power Plan would begin on October 10, 2017.[11][12] The standard federal regulatory procedures and potential legal challenges to implement or change a regulation would likely take up to two years.[13][14][15]
On June 19, 2019, the EPA issued the final Affordable Clean Energy rule (ACE) which replaced the Clean Power Plan. In May 2019, EPA Administrator Andrew Wheeler had announced plans to change the way the EPA calculates health risks of air pollution, saying the change was intended to rectify inconsistencies in the current cost-benefit analyses used by the agency. This became the Affordable Clean Energy rule.[16]
On January 19, 2021, the last full day of the Trump administration, the D.C. Circuit vacated the Affordable Clean Energy rule and remanded to the Environmental Protection Agency for further proceedings consistent with its opinion. The court characterized the ACE as a 'fundamental misconstruction" of environmental laws. The ruling did not reinstate the Clean Power Plan; however, it did create the opportunity for the Biden administration to improve and clarify the rules.[17][18]
In 2022, in the case West Virginia v. EPA, the Supreme Court curbed the EPA’s ability to broadly regulate carbon emissions from existing power plants as was done in the Clean Power Plan. The Clean Power Plan was no longer in place, but if it had been the ruling would have struck it down.[19]
In 2024, the Biden Administration issued a suite of rules called the Greenhouse Gas Standards and Guidelines for Fossil Fuel-Fired Power Plants, sometimes called the "Clean Power Plan 2.0", to replace the Clean Power Plan and ACE.[20]