New Mexico Attorney General v. New Mexico Public Regulation Commission

Summary

The New Mexico Supreme Court considered whether the New Mexico Public Regulation Commission could permit a public utility to earn a return on operating expenses for energy-efficiency programs. The Court held that the Commission’s methodology and approved adder rates were authorized by the Public Utility Act and Efficient Use of Energy Act, consistent with prior precedent, supported by substantial evidence, and neither arbitrary nor capricious. The Court affirmed the Commission’s final order.

Holdings

1. The PRC was not required to use a particular ratemaking method. The Case 308 Final Order was consistent with Attorney General v. New Mexico Public Regulation Commission, 2011-NMSC-034, because the rates were cost based, evidence based, and utility specific and resulted from balancing investor and ratepayer interests.
2. The EUEA authorizes the PRC to allow utilities to earn a return on expenditures incurred for energy-efficiency and load-management resource development, and the authorized profit need not be tied to invested capital.
3. The PRC reasonably relied on the factual record and adjudicated findings from Case 280 because Case 308 involved only the legal sufficiency of the Case 280 Final Order and did not require new fact-finding.
4. The PRC acted within its discretion by using the operating-ratio approach and explaining it by analogy to the Motor Carrier Act; the Case 308 Final Order was neither arbitrary nor capricious.

Questions Presented

1. Whether the Case 308 Final Order was consistent with the Court's prior decision requiring energy-efficiency rates to be evidence based, cost based, utility specific, and the product of balancing investor and ratepayer interests.
2. Whether the EUEA authorizes the PRC to allow a utility to earn a profit on energy-efficiency and load-management expenditures without tying that profit to invested capital or requiring use of the traditional return-on-rate-base method.
3. Whether the Case 308 Final Order was supported by substantial evidence when the PRC relied on factual determinations from the Case 280 proceeding.
4. Whether the PRC's use of an operating-ratio approach, explained by analogy to the Motor Carrier Act, was arbitrary or capricious.

Disposition

affirmed