Cite as: 539 U. S. 39 (2003)
Opinion of the Court
noncompliance with a FERC tariff. But the question before us is whether the LPSC's order is pre-empted under Nantahala and MP&L, and that order does not rest on a finding that the system agreement was violated. The LPSC's express statement that it had no jurisdiction to conclude that there had been a violation of the system agreement confirms this. Consequently, we have no occasion to address the question of the exclusivity of FERC's jurisdiction to determine whether and when a filed rate has been violated.
For the foregoing reasons, the judgment of the Louisiana Supreme Court is reversed.
It is so ordered.
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