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.
Ancillary services scarcities occurred on June 23 and June 25, 2019, in the 15-minute market run for the following regions, services and quantities:
|
Trade Date
|
Hour Ending
|
Intervals
|
Ancillary Service
|
Region
|
Shortfall (MW)
|
Percentage of Requirement
|
|
June 23
|
15
|
4
|
Regulation
Down
|
SP26_EXP
|
0.71
|
0.68%
|
|
June 25
|
15
|
2
|
Regulation
Down
|
SP26_EXP
|
0.80
|
0.77%
|
The ISO confirmed the scarcity events during its price correction process. The published ancillary services prices correctly reflect the approved administrative set of scarcity prices.
