Renewable-wind, solar, geothermal, hydro, biomass, municipal solid waste (MSW), and end-use renewable 3. Demand-side management (DSM)-efficiency improvements and direct load control. These categories are defined in this way simply to facilitate the discussion in this report. The lists of resources in each category are intended to be illustrative rather than exhaustive. Ten general attributes and the characteristics or subattributes that define them are presented in Table 2-1. The table also summarizes the relevance of these attributes for the three resource categories and for specific options within the categories. The remainder of this subsection briefly discusses the 10 general attributes. 1 Capability refers to limits on the ability of an option to supply power or to reduce demand in a given period under normal conditions. These limits include: The capacity rating Any limit on the total amount of energy that can be generated in the period owing, for example, to fuel supply constraints for a fossil station or to water constraints for a hydro station Contractual limits on the number of operations of a direct load control program. The capability of an option may vary between time periods because of parameters such as seasonal variations in ambient temperatures that affect the capacity of a thermal unit. The attributes of renewable resources are also described in Hamrin and Rader (1993) and in Wan and Parsons (1993).

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