In addition to the fair cash value of any plant and appurtenance thereto determined pursuant to Kan. Stat. Ann. § 12-811, a retail electric supplier whose service rights have expired by reason of failure of the renewal of a valid franchise shall be entitled to compensation for all reasonable and prudent costs of detaching the electric system facilities to be sold and all reasonable and prudent costs of reintegrating the remaining electric system facilities of such retail electric supplier less the value of all electric system facilities replaced by new facilities required for the reintegration of the remaining electric system facilities.