In connection with the purposes of this division, the authority shall charge and equitably apportion among participating parties or other public or private entities the authority’s administrative costs and expenses, including operating and financing-related costs incurred in the exercise of the powers and duties conferred by this division, except to the extent that those costs are related to one of the authority’s own enterprises or projects, in which case costs shall be included in the cost of generating that electricity as provided in Section

3351.