For ratemaking purposes, the Commission shall determine the federal and state income tax costs for investor-owned water, gas, or electric utility that is part of a publicly-traded, consolidated group as follows:
In any ratemaking proceeding for an investor-owned utility authorized to furnish water or water and sewer service initiated after January 1, 2022, the Commission shall evaluate such utility on a stand-alone basis and, for purposes of establishing any revenue requirement and rates, utilize such utility's actual end-of-test period capital structure and cost of capital without regard to the cost of capital, capital structure, or investments of any other entities with which such utility may be affiliated, unless the Commission finds based on evidence in the record that the debt to equity ratio of the actual end-of-test period capital structure of such utility is unreasonable, in which case the Commission may utilize a debt to equity ratio that it finds to be reasonable. In all proceedings initiated after January 1, 2022, in which the Commission reviews the rates and associated earnings of an investor-owned utility authorized to furnish water or water and sewer service, the Commission shall conduct such review utilizing the same cost of capital and capital structure adopted in the utility's most recent rate case in which such rates were set, without regard to any later changes in the cost of capital or capital structure.
Va. Code § 56-235.2