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Notice
August 5, 2019

REQUESTED ACTION

Information Only

CATEGORIES

Market Operations

System Operations

Western Energy Imbalance Market

Ancillary Services Scarcity Events on July 16 and July 18, 2019


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.

 

On July 16 and July 18, 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

July 16

11

1

Regulation Up

NP26_EXP

0.1

0.08%

July 16

11

2

Regulation Up

NP26_EXP

0.1

0.08%

July 18

4

 

3

Regulation

Down

SP26_EXP

1.16

1.12%

July 18

12

2

Regulation

Down

SP26_EXP

0.17

0.16%

July 18

13

3

Regulation

Down

SP26_EXP

0.25

0.24%

July 18

15

3

Regulation

Down

SP26_EXP

0.41

0.39%

July 18

23

2

Regulation

Down

SP26_EXP

3.29

3.23%

 

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 or dquint@caiso.com

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