Notification of revised ISO operating procedures 4120, 4510, and 5140

The California ISO has revised the operating procedures referenced below. 

4120 Gas Transmission Pipeline System Limitations or Outages, version 8.1, effective Nov. 6, 2025. 

Replaced Manager of Real-Time Operations and Manager, Real-Time Operations with Manager of BA Operations and Manager, BA Operations. Minor formatting and grammar edits. 

4510 Load Management Programs and Underfrequency Load Shedding, version 6.6, effective Nov. 6, 2025. 

Replaced Manager, Real-Time Operations and Manager of Real-Time Operations with Manager, BA Operations and Manager of BA Operations. Minor formatting and grammar edits. 

5140 California ISO Market Participant Inquiries, version 4.6, effective Nov. 6, 2025. 

Replaced Manager of Real-Time Operations with Manager of BA Operations. Minor formatting and grammar edits and removed history prior to five years.

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