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This note examines the case of Commonwealth Edison Co. v. State of Montana, where the United States Supreme Court analyzed and defined the permissible limitations of state energy resource taxation. While the Court adhered to the test of constitutional taxation established in Complete Auto Transit Inc. v. Brady, which strongly upheld a state's sovereign right to tax a local incident of interstate commerce, the Court failed to realize the practical ramifications of its ruling in the context o the nation's energy problems.