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OperationsNotification of revised ISO operating procedure 4420
The California ISO has revised the operating procedure referenced below.
4420 System Emergency, version 15.8, effective Nov. 26, 2024.
References: Removed SRR Generations Resources table since it is included in 4420H and replaced with a note, "See SRR Long Start and Fast Start tables in 4420H with a link.
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.
Contact information
Please contact the CAISO/RC West Procedure Control Desk at ProcedureControl@caiso.com with any questions.