EPA's Affordable Clean Energy Rule and Related Issues: Frequently Asked Questions [August 13, 2020] [open pdf - 2MB]
From the Document: "In 2019, the U.S. Environmental Protection Agency (EPA) completed its reconsideration of a Clean Air Act (CAA) rule-making for greenhouse gas (GHG) emissions from existing fossil-fuel-fired power plants. Specifically, the agency repealed the Clean Power Plan (CPP) and promulgated new guidelines for coal-fired power plants in the Affordable Clean Energy (ACE) rule. EPA based these actions on its conclusion that the CPP exceeded CAA authority by using measures that applied to the power sector as a whole rather than measures implemented at an individual facility. EPA also promulgated new general regulations to implement the ACE rule and any future emission guidelines issued under CAA Section 111(d)."
CRS Report for Congress, R46482
Congressional Research Service: https://crsreports.congress.gov/