The court upholds a U.S. Environmental Protection Agency (EPA) rule that allows a state to stop Clean Air Act (CAA) §179(a)'s 18-month countdown to imposition of sanctions when it is…

The court holds that provisions of Indiana's Environmental Compliance Plans Act (ECPA) that favor a utility's use of Indiana coal violate the Commerce Clause of the U.S. Constitution.…

The court holds that New Mexico's environmental agency may not bring an enforcement action in federal court to seek federalpenalties under §113 of the Clean Air Act (CAA) for violations of…

The court holds that the Illinois Coal Act violates the Commerce Clause of the U.S. Constitution. The Act requires public utilities to devise Clean Air Act (CAA) compliance plans and present them…