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Market Notice
March 29, 2019

REQUESTED ACTION

Information Only

CATEGORIES

Market Operations

System Operations

Ancillary Services Scarcity Event from March 19-20, 2019

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 March 19-20, 2019, 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

Mar 19

13

4

Regulation Up

CAISO_EXP

12.2

2%

Mar 20

13

1

Regulation Up

CAISO_EXP

4.5

0.8%

Mar 20

14

1, 2

Regulation Up

CAISO_EXP

0.8

0.1%

Mar 20

14

4

Regulation Up

CAISO_EXP

24.6

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