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Notice
January 7, 2019

REQUESTED ACTION

Information Only

CATEGORIES

Market Operations

System Operations

Ancillary Services Scarcity Event on 11/24/19 and 11/26/19


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.

 

On Nov. 24 and Nov. 26, 2019, 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

Nov. 24

12

1

Regulation Up

SP26_EXP

0.46

0.44%

Nov. 24

12

2

Regulation Up

SP26_EXP

0.46

0.44%

Nov. 24

12

3

Regulation Up

SP26_EXP

0.46

0.44%

Nov. 24

12

4

Regulation Up

SP26_EXP

0.46

0.44%

Nov. 24

3

1

Regulation Down

SP26_EXP

0.29

0.28%

Nov. 24

3

2

Regulation Down

SP26_EXP

0.29

0.28%

Nov. 24

3

3

Regulation Down

SP26_EXP

0.29

0.28%

Nov. 24

3

4

Regulation Down

SP26_EXP

0.29

0.28%

Nov. 26

5

1

Regulation Up

SP26_EXP

0.92

0.66%

Nov. 26

5

2

Regulation Up

SP26_EXP

0.92

0.66%

Nov. 26

5

3

Regulation Up

SP26_EXP

0.92

0.66%

Nov. 26

5

4

Regulation Up

SP26_EXP

0.92

0.66%

Nov. 26

12

3

Regulation Up

SP26_EXP

0.11

0.10%

Nov. 26

12

4

Regulation Up

SP26_EXP

0.11

0.10%

Nov. 26

10

4

Regulation Down

SP26_EXP

1.11

1.07%

Nov. 26

11

2

Regulation Down

SP26_EXP

1

0.96%

Nov. 26

12

3

Regulation Down

SP26_EXP

1

0.96%

Nov. 26

12

4

Regulation Down

SP26_EXP

1

0.96%

 

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

Dov Quint at 916-608-7129 (dquint@caiso.com) or Customer Service at 916-608-7320

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California Independent System Operator | P.O. Box 639014 | Folsom, CA 95630 | United States