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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