In the public interest and pursuant to the powers vested in it, the Commission declares that any utility in designing and implementing any promotional practice or practices shall consider what impact, if any, such promotional practice or practices will have upon the conservation of energy and the efficient use of utility plant; and the utility shall not implement any practice or practices which shall have an adverse effect upon conservation, or which cannot be justified from a rate payer benefit/utility cost standpoint.
W. Va. Code R. § 150-6-8