An electric utility shall propose to the Commission a tariff provision that establishes a means to recover the estimated SOS uncollectible expense proposed in Regulation .01 of this chapter. An electric utility shall propose the recovery of CCA uncollectible expense as part of a discount rate tariff that is used for purchased receivables for a CCA using utility consolidated billing to be recovered over a 12-month period following enrollment of customers in the CCA or as otherwise accepted by the Commission. An electric utility may propose an alternate tariff method of recovery of CCA uncollectible expense for a CCA using other billing methods.