Utah Code § 54-3-23: Commission's orders must be obeyed.

Every public utility shall obey and comply with each and every requirement of every order, decision, direction, rule or regulation made or prescribed by the commission in the matters herein specified, or in any other matter in any way relating to or affecting its business as a public utility, and shall do everything necessary or proper in order to secure compliance with and observance of every such order, decision, direction, rule or regulation by all of its officers, agents and employees.