Ind. Code § 8-1-31-12

Sec. 12. The cost of common equity to be used in the calculation of the charge shall be the most recent determination by the commission in a general rate proceeding of the public utility. If the commission finds that the last such determination is no longer representative of current conditions, the commission may make a new determination of the common equity cost rate for use in determining the charge, after notice and hearing. The most recent prior determination shall be used pending any redetermination.