ACC Approves First-Ever Formula Rate Case for UNS Gas; Commissioner Márquez Peterson Dissents
PHOENIX, Ariz. (February 25, 2026) — The Arizona Corporation Commission voted 4–1 on Feb. 19, 2026 to approve UNS Gas, Inc.’s request to implement an Annual Rate Adjustment Mechanism (ARAM)—marking Arizona’s first regulated utility rate case in which the Commission considered and approved an alternative ratemaking method, often referred to as a “formula rate” approach.




