Notification of revised ISO operating procedures 3320 and 5110

The California ISO has revised the operating procedures referenced below:

3320 Voltage and VAR (Voltage Ampere Reactive) Control, version 8.4, effective Dec. 4, 2025. 

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

5110 Real-Time Communications Guidelines, version 17.7, effective Dec. 4, 2025. 

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

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