Page:Michigan v. EPA.pdf/3

 Cite as: 576 U. S. ____ (2015)

1

Opinion of the Court NOTICE: This opinion is subject to formal revision before publication in the preliminary print of the United States Reports. Readers are requested to notify the Reporter of Decisions, Supreme Court of the United States, Washington, D. C. 20543, of any typographical or other formal errors, in order that corrections may be made before the preliminary print goes to press.

SUPREME COURT OF THE UNITED STATES _________________

Nos. 14–46, 14–47, and 14–49 _________________

MICHIGAN, ET AL., PETITIONERS 14–46 v. ENVIRONMENTAL PROTECTION AGENCY, ET AL. UTILITY AIR REGULATORY GROUP, PETITIONER 14–47 v. ENVIRONMENTAL PROTECTION AGENCY, ET AL. NATIONAL MINING ASSOCIATION, PETITIONER 14–49 v. ENVIRONMENTAL PROTECTION AGENCY, ET AL. ON WRITS OF CERTIORARI TO THE UNITED STATES COURT OF APPEALS FOR THE DISTRICT OF COLUMBIA CIRCUIT [June 29, 2015]

JUSTICE SCALIA delivered the opinion of the Court. The Clean Air Act directs the Environmental Protection Agency to regulate emissions of hazardous air pollutants from power plants if the Agency finds regulation “appropriate and necessary.” We must decide whether it was reasonable for EPA to refuse to consider cost when making this finding. I The Clean Air Act establishes a series of regulatory