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Prevention of significant deterioration (PSD)

United States v. Ameren Missouri

A district court granted in part a motion to stay its previous order requiring an electric utility company to obtain a PSD permit to address CAA violations at its coal-fired power plant in Festus, Missouri, and to install air pollution...

United States v. Ameren Missouri

A district court ordered an electric utility company to obtain a PSD permit to address CAA violations at its coal-fired power plant in Festus, Missouri. EPA argued that the company increased the risk of negative health impacts and...

Utility Air Regulatory Group v. Environmental Protection Agency

The D.C. Circuit upheld EPA's 2012 regional haze rule, which seeks to restore air quality and visibility in certain national parks and wilderness areas to what they would be under natural conditions. The rule requires states to impose...

Nucor Steel-Arkansas v. Big River Steel, LLC

The Eighth Circuit affirmed a lower court decision dismissing a steel company's CAA citizen lawsuit seeking injunctive relief to stop a competitor from constructing or continuing to construct a steel mill. Arkansas's environmental...

Sierra Club v. Oklahoma Gas & Electric Co.

The Tenth Circuit dismissed an environmental group's citizen suit against an Oklahoma power company for CAA violations at a power plant. The group claimed the company modified a coal-fired boiler without first obtaining an emission-...

Sierra Club de Puerto Rico v. Environmental Protection Agency

The D.C. Circuit dismissed environmental groups' lawsuit seeking to vacate an EPA rule that implements the CAA's new source review (NSR) permitting scheme in nonattainment areas. The groups filed suit after EPA issued an energy company...

Northwest Environmental Defense Center v. Cascade Kelly Holdings LLC

A district court dismissed environmental groups' CAA citizen suit against a crude oil transloading facility for constructing and operating the facility without a prevention of significant deterioration (PSD) permit. The groups allege...

National Parks Conservation Ass'n v. U.S. Environmental Protection Agency

The Ninth Circuit granted in part and denied in part petitions for review challenging EPA's federal implementation plan to reduce regional haze at two power plants in Montana. The owner and operator of the plants, as well as...

United States v. Oklahoma Gas & Electric Co.

A district court dismissed EPA's lawsuit against an Oklahoma utility under the CAA alleging that it failed to properly project whether modifications made to two coal-fired power plants would result in an increase in emissions. The...

WildEarth Guardians v. McCarthy

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 group alleged that the EPA Administrator...

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