The D.C. Circuit on January 19, 2021, vacated the Trump administration's Affordable Clean Energy (ACE) regulation (2019). Am. Lung Ass'n v. EPA, 2021 WL 162579 (D.C. Cir. Jan. 19, 2021). The ACE rule had replaced the Obama-era 2015 Clean Power Plan (CPP) rule. The two regulations reflected different plans for greenhouse gas (GHG) regulation under the Clean Air Act (CAA). Multiple petitions for review of the ACE rule were filed. Continue reading >