69-3-330. Decision by commission. (1) If, upon such hearing and due investigation, the rates, tolls, charges, schedules, or joint rates are found to be unjust, unreasonable, or unjustly discriminatory or to be preferential or otherwise in violation of the provisions of this chapter, the commission may fix and order substituted therefor such rates, tolls, charges, or schedules as are just and reasonable.
(2) If the commission determines that a rate, toll, or charge has been collected in violation of 69-3-305(1)(b), the commission may order refunds or credits as specified in 69-3-305(3).
(3) If the commission finds that any regulation, measurement, practice, act, or service complained of is unjust, unreasonable, insufficient, preferential, unjustly discriminatory, or otherwise in violation of the provisions of this chapter or that the service is inadequate or any reasonable service cannot be obtained, the commission may substitute therefor other regulations, measurements, practices, services, or acts and make such order relating thereto as is just and reasonable.
(4) In any decision ordering a change in the rates which may be charged for electricity or natural gas, the commission shall list each expenditure submitted by the utility for allowance as an operating cost which is disallowed by the commission as an element of operating costs. The list of disallowed expenditures shall appear in the written decision of the commission and shall itemize each expenditure by amount, category, and purpose.