by article 15, sections 3 and 14, of the Arizona Constitution. ¶ 19 In contrast, the Commission established initial rates for the Competitors -without first holding hearings to determine a fair value rate base. Instead, the Commission required the Competitors only to state them current and maximum rates and charges in tariffs filed with the Commission at least thirty days before providing service. Thereafter, the Competitors could raise their rates up to the maximum stated in the tariff by giving the Commission written notice, but still without any fair value rate base determination. See A.A.C. R14-2-1109, R14-2-1110. ¶ 20 In Scates, this court held that a public service corporation cannot raise rates without first determining a fair value rate base. 118 Ariz. at 534, 578 P.2d at 615 (<HOLDING>). Similarly, the Simms court stated that the
holding that a carrier has a property interest in telecommunication rates and therefore is entitled to due process in the calculation of said rates holding that the commission is required by our constitution to ascertain the value of a utilitys property within the state in setting just and reasonable rates holding that the utilities commission has the discretion to use a hypothetical capital structure in setting customer rates particularly where the utility is a whollyowned subsidiary of a holding company holding that state constitution required reasonable nonresident rates recognizing the private interest in reasonable and proper service at fair just and reasonable rates