If the commission, after following the procedures described above, has reasonable cause to believe that inefficient or uneconomical procurement or use of fuel or purchased energy has resulted in unreasonable or unjust charges or costs to the consumers, then the commission shall initiate a procedure for hearing as provided for in Section 77-3-47 for the purpose of determining whether or not any of the costs or charges included in the fuel adjustment charges to the consumers were unreasonable or unjust. If the commission upon hearing shall find that any charges for the purchase or procurement of fuel or purchased energy were unreasonable or unjust, then the commission shall order that such costs or charges be refunded to the appropriate person or persons together with interest at the same rate prescribed in Section 77-3-39, Section 77-3-69 and Section 77-3-71. In lieu of payment, the utility may credit the service account with the amount due under this subsection if the consumer entitled to the refund is, at that time, a consumer of the utility.
Miss. Code § 77-3-42