Utah Code § 54-4-7
Whenever the commission shall find, after a hearing, that the rules, regulations, practices, equipment, appliances, facilities, or service of any public utility, or the methods of manufacture, distribution, transmission, storage or supply employed by it, are unjust, unreasonable, unsafe, improper, inadequate or insufficient, the commission shall determine the just, reasonable, safe, proper, adequate or sufficient rules, regulations, practices, equipment, appliances, facilities, service or methods to be observed, furnished, constructed, enforced or employed, and shall fix the same by its order, rule or regulation. The commission, after a hearing, shall prescribe rules and regulations for the performance of any service or the furnishing of any commodity of the character furnished or supplied by any public utility, and on proper demand and tender of rates such public utility shall furnish such commodity or render such service within the time and upon the conditions provided in such rules.
Utah Code § 54-4-7