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Proposed Revision Request Detail Help
PRR Life Cycle*Initial Comment********
PRR Details
PRR #
1678
Title Clarification on how storage resources are subject to ancillary service state of charge constraints and envelope constraints
Date Submitted 5/29/2026 3:45 PM
PRR Category B
Priority Normal
Owner Martin, Michael (CAISO)
Status Initial Comment
Status End Date 6/16/2026 11:59 PM
Related BPM Market Operations
BPM Section 4.2.9 Ancillary Service Constraints for Storage Resources
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Existing Language

​See Attached

Proposed Language

​​See Attached​

Reason For Revision

This update details how State of Charge (SOC)​ constraints in Day Ahead ensure adequate SOC to cover all energy, ancillary services, and capacity products in each hour and how in Real Time SOC constraints ensure sufficient SOC to cover all energy, ancillary services, and flexible ramping awards in each interval​.

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Impact Analysis
PRR 1678 Impact Analysis Form.doc    
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