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 Jan. 22-31, 2021, 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
|
|
Jan 22
|
10
|
1-4
|
Regulation Up
|
SP26_EXP
|
2.03
|
0.8%
|
|
Jan 24
|
10
|
4
|
Regulation Up
|
SP26_EXP
|
4.95
|
2.0%
|
|
Jan 27
|
13
|
4
|
Regulation Up
|
SP26_EXP
|
2.33
|
1.1%
|
|
Jan 29
|
7
|
3
|
Regulation Down
|
NP26_EXP
|
0.11
|
0.1%
|
|
Jan 29
|
8
|
1,2,4
|
Regulation Down
|
NP26_EXP
|
0.53
|
0.2%
|
|
Jan 29
|
18
|
1
|
Regulation Down
|
NP26_EXP
|
0.11
|
0.03%
|
|
Jan 29
|
18
|
3
|
Regulation Down
|
CAISO_EXP
|
0.65
|
0.1%
|
|
Jan 29
|
20
|
4
|
Regulation Down
|
NP26_EXP
|
0.3
|
0.2%
|
|
Jan 30
|
9
|
1
|
Regulation Down
|
NP26_EXP
|
0.11
|
0.03%
|
|
Jan 30
|
9
|
3
|
Regulation Up
|
SP26_EXP
|
2.26
|
1.3%
|
|
Jan 30
|
16
|
2, 3
|
Regulation Down
|
CAISO_EXP
|
1.5
|
0.2%
|
|
Jan 30
|
16
|
2,3
|
Regulation Down
|
NP26_EXP
|
0.84
|
0.2%
|
|
Jan 31
|
7
|
4
|
Regulation Down
|
NP26_EXP
|
1.06
|
0.6%
|
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.
