REQUESTED ACTION
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Markets OperationsAncillary Services Scarcity events on 2/7-9/25
The California ISO has an ancillary services scarcity pricing mechanism in place that is triggered when the ISO is unable to procure the target quantity of one or more ancillary services in the integrated forward market or real-time market runs.
From Feb. 7 to 9, 2025, ancillary service scarcity occurred in the 15-minute market run for the following regions, services and quantities:
Trade Date | Hour Ending | Interval | Ancillary Service | Region | Shortfall (MW) | Percentage of Requirement |
Feb 07 | 16 | 2 | Regulation Down | NP26_EXP | 2.93 | 0.5% |
Feb 08 | 15 | 3 | Regulation Down | NP26_EXP | 24.35 | 3.95% |
Feb 08 | 16 | 2, 3 | Regulation Down | NP26_EXP | 9.15 | 1.8% |
Feb 09 | 15 | 2 | Regulation Down | NP26_EXP | 9.89 | 1.4% |
Feb 09 | 15 | 3 | Regulation Down | NP26_EXP | 17.89 | 2.5% |
The ISO confirmed the scarcity event during its price correction process. The published ancillary services prices correctly reflect the approved administrative set of scarcity prices.
Contact information
Please contact Jennie Araj at 916-351-2165 or jaraj@caiso.com with any questions.