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Proposed Revision Request Detail Help
PRR Life Cycle*Initial Comment********
PRR Details
PRR #
1679
Title Updates to battery point definitions
Date Submitted 5/29/2026 4:02 PM
PRR Category A
Priority Normal
Owner Namburi, Priyanka (CAISO)
Status Initial Comment
Status End Date 6/16/2026 11:59 PM
Related BPM Direct Telemetry
BPM Section 14.5
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Existing Language

   Instantaneous State Of Charge (SOC)

The Instantaneous SOC is the amount of energy in MWh that the battery, in real time, has available for CAISO participation.  The SOC will be maintained within energy limit constraints (minimum and maximum) defined in the CAISO Master File.  Data should be updated every four seconds and should vary from zero to maximum energy limit. 

 Maximum Continuous Energy limit

The Maximum Continuous Energy Limit is the maximum energy in MWh that can be stored in the battery for CAISO participation. This value cannot be above the maximum energy limit defined in the CAISO Master File. The derate should be reflected, when applicable, in real time.​


Proposed Language

         Instantaneous State Of Charge (SOC)

The Instantaneous SOC is the amount of energy in MWh that the battery, in real time, has available for CAISO participation at the time this value is conveyed through telemetry. This value should be between the Minimum Continuous Energy Limit and Maximum Continuous Energy Limit as registered in the Master File, adjusted by any applicable outage, derate, or rerate.  The SOC will be maintained within energy limit constraints (minimum and maximum) defined in the CAISO Master File.  Data should be updated every four seconds and should vary from zero to maximum energy limit. 

            Maximum Continuous Energy limit

The Maximum Continuous Energy Limit is the maximum energy in MWh that can be stored in the battery for CAISO participation at the time this value is conveyed through telemetry. This value should align with what is registered in the Master File, adjusted by any applicable outage, derate, or rerate. This value cannot be above the maximum energy limit defined in the CAISO Master File. The derate should be reflected, when applicable, in real time.​

Reason For Revision

​Updates to battery point definitions​ to add clarity​ to the Instantaneous State Of Charge (SOC) and Maximum Continuous Energy limit.​


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