(1) General rules:

(a) Rates for sales:

(i) Shall be just and reasonable, and in the public interest; and

(ii) Shall not discriminate against any qualifying facility in comparison to rates for sales to other customers served by the utility.

Utilities may not deny service to a customer for which the customer otherwise qualifies based on the presence of a qualifying facility, including interruptible power service.

(b) Rates for sales that are based on accurate data and consistent system-wide costing principles will not be considered to discriminate against any qualifying facilities if those rates apply to the utility's other customers with similar load or other cost-related characteristics.

(2) Additional services to be provided to qualifying facilities:

(a) Upon request by a qualifying facility, each utility will provide:

(i) Supplementary power;

(ii) Back-up power;

(iii) Maintenance power; and

(iv) Interruptible power.

(b) The commission may waive any requirement of (a) of this subsection if, after notice in the area served by the utility and after opportunity for public comment, the utility demonstrates and the commission finds that compliance with such requirement will:

(i) Impair the utility's ability to render adequate service to its customers; or

(ii) Place an undue burden on the utility.

(3) The rate for sale of back-up power or maintenance power:

(a) Shall not be based on an assumption, unless supported by factual data, that forced outages or other reductions in electric output by all qualifying facilities on a utility's system will occur simultaneously, or during the system peak, or both; and

(b) Must take into account the extent to which scheduled outages of the qualifying facilities can be usefully coordinated with scheduled outages of the utility's facilities.