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UNION ELECTRIC CO. v. EPA

No. 74-1542.

427 U.S. 246 (1976)

96 S.Ct. 2518

49 L.Ed.2d 474

UNION ELECTRIC CO. v. ENVIRONMENTAL PROTECTION AGENCY ET AL.

Supreme Court of United States.

Decided June 25, 1976.

Attorney(s) appearing for the Case

William H. Ferrell argued the cause and filed briefs for petitioner.

Assistant Attorney General Taft argued the cause for respondent Environmental Protection Agency. With him on the brief were Solicitor General Bork, Deputy Solicitor General Randolph, and Edmund B. Clark. John C. Danforth, Attorney General of Missouri, pro se, and Walter W. Nowotny, Jr., and Dan Summers, Assistant Attorneys General, filed briefs for respondents Danforth et al.*

MR. JUSTICE MARSHALL delivered the opinion of the Court.

After the Administrator of the Environmental Protection Agency (EPA) approves a state implementation plan under the Clean Air Act, the plan may be challenged in a court of appeals within 30 days, or after 30 days have run if newly discovered or available information justifies subsequent review. We must decide whether the operator of a regulated emission source, in a...

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