1. Whenever a notice or any schedule stating an individual or joint rate, classification, contract, practice, or rule, increasing or decreasing, or resulting in an increase or decrease in any rate, is filed with the commission, the commission may suspend by motion the rate, classification, contract, practice, or rule but the period of suspension may not extend more than six months beyond the time when it otherwise would go into effect unless the commission and the utility filing the notice or schedule agree to the extension. Upon complaint or upon its own initiative without complaint the commission may order a hearing, upon due notice, concerning the propriety of the rate, classification, contract, practice, or rule. On such hearing, the commission shall establish the rates, classifications, contracts, practices, or rules proposed, in whole or in part, or others in lieu thereof, which it finds to be just and reasonable. At any such hearing, the burden to show that the increased rate or proposed change of rate, classification, rule, or practice is just and reasonable is upon the public utility applying for the increase. All such rates, classifications, contracts, practices, or rules, not suspended, on the expiration of thirty days from the time of filing with the commission, or of such lesser time as the commission may grant, become effective rates, classifications, contracts, practices, or rules, subject to the power of the commission, after a hearing had on its own motion or upon complaint, to alter or modify the same. 2. Notwithstanding that the commission may suspend a filing and order a hearing, a public utility may file for interim rate relief as part of its general rate increase application and filing. If interim rates are requested, the commission shall order that the interim rate schedule take effect no later than sixty days after the initial filing date and without a public hearing. The interim rate schedule must be calculated using the proposed test year cost of capital, rate base, and expenses, except that the schedule must include: a. A rate of return on common equity for the public utility equal to that authorized by the commission in the public utility's most recent rate proceeding; b. Rate base or expense items the same in nature and kind as those allowed by a currently effective commission order in the public utility's most recent rate proceeding; and c. No change in existing rate design. 3. In ordering an interim rate schedule, the commission may require a bond to secure any projected refund required by subsection 4. The terms of the bond, including the amount and surety, are subject to the commission's approval. 4. As ordered by the commission, the utility shall promptly refund to persons entitled thereto all interim rate amounts collected by the public utility in excess of the final rates approved by the commission plus reasonable interest at a rate to be determined by the commission.
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