Entergy Louisiana, Inc. v. Louisiana Public Service Commission

Background

Entergy Louisiana is one of five operating utilities owned by a multistate company. Those utilities share generating capacity and use a FERC-approved system agreement tariff with a Service Schedule MSS-1 that allocates costs monthly. Some units were placed in an Extended Reserve Shutdown (ERS) program — out of immediate use but able to return to service — and were counted as available for cost calculations. After a FERC proceeding, FERC found the pre-amendment classification of ERS units violated the tariff but denied refunds and approved an amendment allowing the operating committee to treat ERS units as available if it intended to return them to service. The Louisiana Public Service Commission (LPSC) later disallowed certain MSS-1 payments as imprudent after that amendment, and Louisiana courts upheld the LPSC’s order.

Reasoning

The Court asked whether a FERC tariff that lets the regulated companies’ committee decide how to classify units prevents a state regulator from second-guessing those cost allocations. Relying on earlier decisions, the Court said yes. It explained that when a cost allocation is set in a FERC-filed tariff — including automatic adjustment clauses like MSS-1 — a state order that would trap or deny recovery of those costs conflicts with the federal scheme. Because the system agreement delegated the classification to the operating committee and MSS-1 is an automatic adjustment clause, the state’s disallowance was pre-empted.

Real world impact

The decision protects FERC-approved cost allocations from being undone by state rate regulators when those allocations are embodied in a tariff that assigns who decides classifications. Utilities can rely on such tariff allocations when setting retail rates, and state regulators have reduced ability to strip recovery of those costs.