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Market Notice
December 6, 2018

REQUESTED ACTION

Information Only

CATEGORIES

Market Operations

System Operations

Ancillary Services Scarcity Event from November 29-30, 2018

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 Nov. 29-30, 2018, ancillary service scarcities 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 29

12

4

Regulation Up

NP26

8.1

81%

Nov 30

21

2

Regulation Up

SP26_EXP

1.4

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 or jsage@caiso.com

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