As used in this act:

    (a) "Site" means, except as used in part 8, a contiguous site, regardless of the number of meters at that site. A site that would be contiguous but for the presence of a street, road, or highway is considered to be contiguous for the purposes of this subdivision.

    (b) "Transmission line" means all structures, equipment, and real property necessary to transfer electricity at system bulk supply voltage of 100 kilovolts or more.

    (c) "Utility system resource cost test" means a standard that is met for an investment in energy waste reduction if, on a life cycle basis, using a real societal discount rate based on actual long-term United States treasury bond yields, the total avoided supply-side costs to the provider, including representative values for electricity or natural gas supply, transmission, distribution, and other associated costs, are greater than the total costs to the provider of administering and delivering the energy waste reduction program, including net costs for any provider incentives paid by customers and capitalized costs recovered under section 89.

    (d) "Wind energy conversion system" means a system that uses 1 or more wind turbines to generate electricity and has a nameplate capacity of 100 kilowatts or more.

    (e) "Wind energy resource zone" or "wind zone" means an area designated by the commission under section 147.