The Ninth Circuit upheld a lower court decision dismissing an environmental group's citizen suit requesting EPA to issue more stringent regulations for ozone pollution under the PSD program.…

The Tenth Circuit denied petitions for review challenging EPA's approval of a regional cap-and-trade program regulating sulfur dioxide (SO2) emissions to address regional haze over the…

The Seventh Circuit dismissed an environmental group's lawsuit challenging EPA's decision not to object to Wisconsin's renewal of a Title V permit for a pre-1975 paper mill. Under…

The Ninth Circuit vacated and remanded EPA's decision to issue a PSD permit allowing a power company to build and operate a 600 megawatt natural gas-fired power plant. EPA missed the one-year…

The U.S. Supreme Court held that EPA's regulation of greenhouse gas (GHG) emissions from new motor vehicles did not automatically trigger the CAA's permitting requirements for stationary…

A district court dismissed an environmental group's citizen suit in which it alleged a power company was attempting to construct a major modification of its coal-fired power plant in Illinois…

A district court granted in part and denied in part motions to dismiss an environmental group's citizen suit against a utility company for alleged CAA violations at a coal-fired power plant…

A district court rejected a group of mid-Atlantic states' claims that projects undertaken by an energy company at three of its coal-fired power plants in Pennsylvania violated the CAA's…

The Supreme Court of Kansas reversed and remanded the Kansas Department of Health and Environment's decision to issue a prevention of significant deterioration (PSD) permit to a power company…

The Eighth Circuit vacated and remanded EPA's best available retrofit technology (BART) determination for a large power plant in North Dakota, but otherwise upheld EPA's partial…