Mountain Fuel Supply Co. v. Public Service Commission

ZIMMERMAN, Justice:

Mountain Fuel Supply Company (“Mt. Fuel”) petitions for review of a Public Service Commission (“Commission”) order dated November 21, 1990, establishing new rates and charges for natural gas delivery in Utah. Mt. Fuel challenges (i) the Commission’s decision to use “an historical test year” to determine the utility’s new rates; (ii) its refusal to admit evidence of “a future test year”; (iii) its refusal to make adjustments based on information obtained after the historical test year; (iv) its use of an average rate base rather than a year-end rate base; and (v) its…