This section 104 shall only apply Wwhenever an electric utility purchases fuel for generation from a corporation or company which is owned in whole or in part by the electric utility or its parent company, and that was formed for the purpose of buying fuel for resale to affiliates. If this section applies, the following items of cost, heretofore properly included in fuel adjustment calculations, are ineligible after July 1, 1978, for inclusion in its fuel adjustment clause or rider, even though such items of cost may be included in the invoice price paid for such fuel:
39 Miss. Code. R. 1-17-104