Costs of ISO-NE Day-ahead Ancillary Services Higher than Expected
Day-ahead ancillary services prices: Ten-Minute Spinning Reserve (TMSR), Ten-Minute Non-Spinning Reserve, (TMNSR), Thirty-Minute Operating Reserve (TMOR), and Forecast Energy Requirement (FER) | ISO-NE
Dec 11, 2025
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ISO-NE’s new day-ahead ancillary services market added about $258 million in incremental costs between March and August, equal to 7.6% of total energy market costs.
