Commonwealth Edison Co. v. Montana

453 U.S. 609 · Decided July 2, 1981 · Supreme Court of the United States

At a glance

Commonwealth Edison Co. v. Montana was decided on July 2, 1981 by a vote of 6–3. The Court affirmed the lower court's decision. Justice Thurgood Marshall wrote the opinion of the Court. SCDB classifies its main issue as “State or local government tax” in the Economic Activity area. SCDB codes this decision as formally altering one or more of the Court's own precedents.

Read the opinion

• CourtListener (Free Law Project) — opinion text
• Library of Congress — official U.S. Reports scan

Case details

How the Justices voted

Full case caption

Commonwealth Edison Co. et al. v. Montana et al.

SCDB identifiers: case 1980-151, docket 1980-151-01.

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Source: Supreme Court Database, 2026 Release 01 (data file dated September 8, 2026). Imported into CaseTrail November 5, 2026. Coverage: decisions from the 1946 through 2025 Terms. Methodology · Report an error