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Market Notice
November 6, 2018

REQUESTED ACTION

Information Only

CATEGORIES

Market Operations

System Operations

Ancillary Services Scarcity Event from October 27-29, 2018

SUMMARY

The California ISO reports that an ancillary services scarcity pricing was triggered from Oct. 27-29, 2018, in the 15-minute market run.


MESSAGE

The 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 Oct. 27-29, 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

Oct 27

11

4

Regulation Up

SP26_EXP

10.88

10.4%

Oct 27

14

1

Regulation Up

SP26_EXP

6.38

5.7%

Oct 29

4

1

Regulation Up

CAISO_EXP

0.01

0.003%

 

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