Notification of revised ISO operating procedures 2510, 3200, 4100, and 4420

The California ISO has revised the operating procedure(s) referenced below. 

2510 NERC (North American Electric Reliability Corporation) and CAISO Tagging Requirements, version 10.2, effective July 31, 2025. 

Removed examples of Contract Reference Number (CRN) Existing Transmission Contracts (ETC)/Transmission Ownership Rights (TOR) in the misc field under CAISO PRIORITY TYPE, since this is not a requirement and may cause confusion. Minor format and grammar edits. 

3200 Normal Operations Planning Process, version 6.4, effective July 31, 2025. 

Periodic Review: Defined Operating Studies Subcommittee (OSS) in Section 3.2.4. Updated NERC TOP-001 standard reference version. Minor format and grammar edits and removed history prior to five years.

4100 System Operations Emergency Plan, version 11.9, effective July 31, 2025. 

Annual Review: Minor formatting and grammar edits and removed history prior to five years.

4420 System Emergency, version 16.2, effective July 31, 2025.

Added note throughout wherever blast calls are referenced - 
Note: Caller ID for Blast calls will show “Sonexis Blast Call.”

Updated from CAISO Manager, Real-Time Operations or Manager of Real-Time Operations to Manager, Balancing Authority (BA) Operations and Manager of BA Operations. Minor formatting and grammar edits.

The California ISO’s operating procedures are available on the Operating Procedures webpage.