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Two forms of intermittent renewable energy, wind and solar electricity generation, present challenges due to the timeframe of changes in generation and the limited correlation with demand cycles. Solar will vary greatly throughout the course of a [[diurnal]] cycle, and both may also be subject to a wide range of variation profiles based on season and ___location. In addition, day-to-day power generation may vary significantly (due to prevailing winds or cloud cover) with predictability estimated by weather services. Similarly, the ability of operators to control output for both is generally limited to [[curtailment]] or storage: power output can be decreased or stored, but generally not increased at will. Curtailment and storage of output are common features in electrical grids and for wind and solar installations, though reducing power sold to the grid may substantially affect project economics. Proponents of high penetrations of variable sources argue that a spot pricing or demand response will be required whereby pricing or demand is adjusted inversely with the variable output of the intermittent sources, and that this has an inherently low cost.
[[Hydropower]] can be intermittent and/or dispatchable, depending on the configuration of physical plant. Typical [[hydroelectric]] plants in the dam configuration may have substantial storage capacity, and be considered dispatchable. [[Run of the river]] hydroelectric generation will typically have limited or no storage capacity, and be intermittent on a seasonal or annual basis (dependent on rainfall and other factors). Hydroelectric dams have limits to dispatchability, since storage is finite and there are often environmental and regulatory requirements that
==Intermittency: wind energy==
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