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Notice
September 16, 2020

REQUESTED ACTION

Information Only

CATEGORIES

Markets

Operations
Ancillary Services Scarcity Events from 8/28/20 - 9/6/20

MESSAGE

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 Aug. 28, 2020 to Sept. 6, 2020, ancillary service scarcity occurred 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

Aug. 28

19

2

Non-Spin

SP26_EXP

51.9

13%

Aug. 28

19

3

Non-Spin

SP26_EXP

42.56

11%

Aug. 28

19

4

Non-Spin

SP26_EXP

39.24

10%

Sept. 5

18

4

Non-Spin

SP26_EXP

158.32

36%

Sept. 5

19

2

Non-Spin

SP26_EXP

178.34

42%

Sept. 5

19

3

Non-Spin

SP26_EXP

197.14

46%

Sept. 5

19

4

Non-Spin

SP26_EXP

156.21

37%

Sept. 5

20

2

Non-Spin

SP26_EXP

281.52

68%

Sept. 5

20

2

Spin

SP26_EXP

49.07

12%

Sept. 6

19

2

Spin

SP26_EXP

30.56

7%

Sept. 6

19

3

Spin

SP26_EXP

36.8

8%

Sept. 6

20

3

Non-Spin

SP26_EXP

4.08

1%

 

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

Jennie Sage at 916-351-2165 ( jsage@caiso.com) or ISO Customer Service at 916-608-7320
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California Independent System Operator | P.O. Box 639014 | Folsom, CA 95630 | United States