A CCA or its designated agents may not assess any fee, tax, or other charge bundled into the aggregation charges or rates billed to CCA customers that is not related to the cost of: Providing electricity supply and electricity supply service, including service from a generating station owned by the CCA; Promoting the use of renewable energy; Promoting electric company energy efficiency programs for electric companies within the county such that: Any promotion shall be conducted in consultation with the electric company and the Department of Housing and Community Development; and The county may not promote electric company energy efficiency programs not approved by the Commission; or Providing and promoting programs supplemental to programs permitted in §C(2) of this regulation.