REQUESTED ACTION

Forward to Operating Department

MESSAGE

The California ISO has revised the operating procedures referenced below.

4420 System Emergency, version 13.0, effective June 15, 2021

Annual Review:

Changed all references of Reliability Must Run (RMR) to Legacy RMR to align with Operating Procedure 2310.
Replaced Staged Emergency with Energy Emergency.
Replaced System Operations with Grid Operations.
Updated Warning section.
Added Metered Subsystem (MSS) to Responsibilities section.
Changed “call” and “conference call” to “conduct a blast call” throughout.
Added new Operating Procedure 4420H Customer Agreements to Appendix section.
Added Section 3.2 CAISO Communications Regarding Forecasted System Conditions.
Updated Tariff references.
Replaced ISO with CAISO and minor format and grammar updates for consistency.

4420C System Emergency Notice Templates, version 9.0, effective June 15, 2021

Annual Review:

Updating messaging; changed order of alerts to be consistent with 4420, 4420B, Flex Alert, Restricted Maintenance Operation (RMO), Transmission Emergency, Alert, Warning, etc. Updated instances of ISO to CAISO. Updated energy emergency language for warning, stages 1, 2, and 3.
Added Table of Contents.

4420E Allowable Transmission Maintenance Activities During Restricted Maintenance Operations, version 12.0, effective June 15, 2021

Annual Review: Updated from ISO to CAISO.