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Market Notice
June 11, 2019


Forward to Operating Department


System Operations

Notification of Revised ISO Operating Procedure 4420


The California ISO has revised the operating procedure referenced below.


4420 System Emergency, version 12.0, effective June 11, 2019.

Annual Review:

Section 3.4: Removed Steps 19, 20, 22 and 23 to remove declaration of Energy Emergency Alert 2 (EEA2) and Energy Emergency Alert 3 (EEA3), per updated Reliability Coordinator (RC) procedures.

Section 3.5: Updated WECC Standard BAL-002 reference.

Section 3.5.2: Moved Steps 15, 16, and 17 to Steps 7, 8 and 9.

Sections 3.5.2, 3.5.3 and 3.5.4: Updated Step 5 note to be consistent with other notes regarding Shift Manager or designee to file DOE OE-417 if Emergency Response Coordinator (ERC) is unavailable.

Replaced Reliability Messaging Tool (RMT) with Reliability messaging system throughout.

Replaced Peak RC with the RC under Operationally Affected Parties.

References Section: Removed BAL-004 reference from NERC Requirements.

Minor format and grammar updates.


ISO Operating Procedures -


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