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NYISO Seeks ICAP Changes Described As, "Important Step Towards A Comprehensive Winter Capacity Market"; Includes Seasonal Requirements
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The New York Independent System Operator, Inc. filed at FERC for approval for changes to the ICAP capacity market, including seasonal New York Control Area ('NYCA') minimum capacity requirements
NYISO said that it is seeking the revisions, "in response to ongoing changes to New York’s electric grid, including the emergence and expected growth of winter risks as New York transitions to a winter peaking system."
NYISO described the changes as, "an important step towards a comprehensive winter capacity market."
Specifically, the NYISO proposes to revise its tariff to (1) provide for seasonal NYCA minimum capacity requirements, seasonal transmission security limit ('TSL') floor values, and seasonal Locational Minimum Installed Capacity Requirements (LCRs); (2) provide for seasonal elections for Unforced Capacity Deliverability Rights ('UDRs') and External-to-Rest of State Deliverability Rights ('EDRs') with an accompanying must offer requirement consistent with the submitted elections; and (3) adjust the ICAP Demand Curves to reflect the establishment of seasonal minimum capacity requirements.
The separate summer and winter minimum capacity procurement requirements would be based on the final IRM (installed reserve margin) study case for the applicable Capability Year, which reflects the NYSRC-approved IRM, so that the NYSRC-established resource adequacy criterion is met.
Under this proposal, the Summer NYCA Minimum ICAP Requirement calculation would remain unchanged. It would continue to be consistent with the NYSRC-approved IRM value, NYISO said
The proposed Winter NYCA Minimum ICAP Requirement would be derived from the available capacity in the winter peak month, as identified from data for the final IRM study case and the winter NYCA forecasted peak load value for the applicable Capability Year as determined by the NYISO. "As such, the proposed Winter NYCA Minimum ICAP Requirement is designed to meet the NYSRC-established resource adequacy criterion," NYISO said
To implement seasonal minimum capacity procurement requirements, seasonal LCRs need to be calculated, NYISO said. Like the proposed Winter NYCA Minimum ICAP Requirement, the proposed Winter LCRs would be derived from the available capacity in each Locality in the winter peak month, as identified from the data for the final IRM study case. The proposed Winter LCRs would be calculated based on the applicable Locality non-coincident peak load forecast as modeled in the final IRM study case
The NYISO does not propose to change the LCR determination process, including the inputs to the LCR economic optimization software (also known as the LCR optimizer) such as the final IRM study case, the NYSRC-approved IRM, and the target LOLE (i.e., the LOLE associated with the NYSRC-approved IRM).
The NYISO requests that the proposed revisions become effective April 20, 2026
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February 18, 2026
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Reporting by Paul Ring • ring@energychoicematters.com
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