(1) A DSU's default service responsibilities are:

(a) to plan and manage its resource portfolio in order to provide adequate, reliable, and efficient annual and long-term default electricity supply services at the lowest total cost;

(b) to provide all or a substantial amount of the emergency electricity supply requirements of retail customers who have electricity supply service contracts with a licensed electricity supplier or marketer that has failed to deliver the required electricity supply. (A DSU is not required to maintain a reserve of electricity supply to fulfill its emergency supply responsibilities. To the greatest extent practicable, a DSU should recover the costs of providing emergency service from the supplier or marketer that failed to deliver the required electricity or the customers that directly benefited from the DSU's provision of emergency service. A DSU must provide emergency service according to commission-approved tariff schedules.) ; and

(c) to comply with the provisions of the Montana Renewable Power Production and Rural Economic Development Act, codified at 69-8-1001 through 69-8-1008 , MCA, and ARM 38.5.8301.

(2) The DSU should establish an optional retail electricity product composed of or supporting power from certified environmentally preferred resources that include but are not limited to biomass, wind, solar or geothermal resources. The resources used to provide this service should be certified as meeting industry-accepted standards.