Capability period

NYISO's capacity market runs in two capability periods each year: summer, May through October, and winter, November through April. The statewide coincident peak that sets ICAP tags lands in the summer period. In the four settled years from 2022 through 2025 it fell in June, July, or September, always on a business-day afternoon. Tags derived from one summer's peak apply to the following capability year.

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