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Proposed Revision Request Detail Help
PRR Life Cycle*****Stakeholder Meeting on Recommendation****
PRR Details
PRR #
1661
Title New long start resource min down time awareness enhancement
Date Submitted 2/23/2026 9:51 AM
PRR Category B
Priority Normal
Owner Martin, Michael (CAISO)
Status Stakeholder Meeting on Recommendation
Status End Date 4/14/2026 11:59 PM
Related BPM Market Operations
BPM Section 7.3.1.3 Resource Capacity Constraints
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Existing Language

​See Attached

Proposed Language

​See Attached​

Reason For Revision

This PRR introduces a new market feature, previously known as the Terminal Condition, to ensure a minimum down time is honored in real time should the resource’s minimum down time exactly equal the time between shut-down and the time between the next day-ahead market award.  ​

Click here to view the Recommendation Details for this PRR
BPM PRR Submitter

Martin, Michael (CAISO)
Modified BPM language proposed by the PBM Chnage Management Coordinator

Approve with corrections and clarification received

Identification of the authorship of comments

Approve with corrections and clarification received
Action

Approve the BPM PRR as modified.

Updates will be completed before the next PRR meeting
Statement of apparent requirements of the BPM PRR

NA
Priority and rank for any BPM PRR requiring a CAISO system change

Proposed effective date(s) of the BPM PRR

May 1 2026
Other recommended actions

NA
Announcements
We have posted an attachment with the ISO's response to the initial comments received for this PRR.
Posted On - 3/18/2026 11:23 AM
Impact Analysis
PRR Impact Analysis Form 1661.doc    
Notes:
Initial Comments
The CAISO describes this PRR as introducing a new “Terminal Condition” feature to ensure that a resource’s minimum down time is honored in the Real-Time Market if a resource’s minimum down time is exactly equal to the time between a scheduled shut down and the next Day-Ahead Market award for that resource.  The Six Cities have not identified a concern with the concept described in the PRR, but the example included in the PRR is confusing and raises questions.  First, the PRR refers to Long-start resources, but the example involves a resource that does not meet the definition of a Long-Start resource, raising a question about the intended scope of the PRR.  The definition of Long Start resource is a cycle time greater than 255 minutes or 4.25 hours, and the example involves a resource with a minimum down time of 4 hours.  Second, the illustrative example involves whole hourly amounts.  If the minimum down time of a resource equals 4.25 hours, it is not clear whether the binding shut down provided in the PRR would occur at 12:45 in the Real-Time optimization or at 12:00 or 13:00 in the Day-Ahead schedule.  The Six Cities request that the CAISO clarify the example and the application of the PRR.
3/17/2026 2:28 PM
Logged By - Bonnie Blair (Cities of Anaheim, Azusa, Banning, Colton, Pasadena, and Riverside, CA)
SCE Comments for PRR1661.pdf    
Please see attached comments from Southern California Edison.
3/17/2026 1:16 PM
Logged By - John Diep (Southern California Edison)
Recommendation Comments
No Recommendation Comments available for this PRR.
Attachments