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Proposed Revision Request Detail Help
PRR Life Cycle*****Stakeholder Meeting on Recommendation****
PRR Details
PRR #
1705
Title Provides additional guidance on the steps required for a WEIM entity to terminate real-time market participation
Date Submitted 8/28/2026 9:04 AM
PRR Category A
Priority Normal
Owner Martin, Michael (CAISO)
Status Stakeholder Meeting on Recommendation
Status End Date 10/13/2026 11:59 PM
Related BPM Energy Imbalance Market
BPM Section 3.1 Implementing and Terminating the WEIM Entity Participation
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Existing Language

​See Attached

Proposed Language

​See Attached​

Reason For Revision

Outlines the high-level activities and considerations that the CAISO and a terminating WEIM Entity must jointly undertake to support an orderly withdrawal from the Real-Time Market, including coordination of market and intertie changes, scheduling and testing of system updates, evaluation of reliability impacts, stakeholder communications, and completion of all required operational and administrative actions.

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 the BPM PRR as submitted

Identification of the authorship of comments

Continuing to work with stakeholders on language and questions
Action

Approve the BPM PRR as submitted

separate meetings in process
Statement of apparent requirements of the BPM PRR

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

Proposed effective date(s) of the BPM PRR

Other recommended actions

Announcements
Please see attached CAISO responses to questions
Posted On - 9/28/2026 2:24 PM
Impact Analysis
PRR 1705 - Impact Analysis Form.doc    
Notes:
Initial Comments
Salt River Project Agricultural Improvement and Power District (SRP) is engaged in ongoing discussions with CAISO staff regarding terminating WEIM participation. SRP appreciates the CAISO providing additional details for WEIM termination and considers it critical that any BPM changes related to WEIM termination be aligned with decisions made during our discussions with CAISO staff.
For the CAISO’s preparation responsibilities, SRP has the following questions and requests that the CAISO add details to the language:
• How much flexibility will the CAISO provide in determining the date to disable the Real-Time Market for the terminating Entity? What are the parameters influencing that flexibility? Is there a limit to how far in advance of the WEIM Agreement termination date the CAISO would make this determination? To what degree does the CAISO’s network modeling efforts impact this flexibility? If it does, then it would be good to provide clarity in that regard.
• How will the CAISO determine the disabling effective date if multiple entities desire to terminate but do not align on the timing? At what frequency would the CAISO schedule disabling effective dates (e.g., monthly, bi-annually)?
SRP requests the CAISO provide additional detail on the following terminating WEIM Entity responsibilities:
1. Participating in planning meetings with CAISO and other WEIM Entities[TED1.1][MLM1.2]
2. Updating systems to retain the functionality needed for ongoing EIM Entity Scheduling Coordinator obligations[TED2.1]
3. Communicating changes to the configuration or modeling of resources that may be impactful to WEIM Entities
4. Participating in the planning and execution of testing with CAISO and Real-Time Market participants
For responsibility #1, please be more descriptive in the frequency, attendees, and time requirements for the planning meetings that will need to be attended by each entity, so we can be intentional in selecting a representative(s) to be in attendance.
For responsibility #2, the systems for the EIM Entity Scheduling Coordinator (EESC) seem to focus on transmission operations and scheduling, rather than the merchant functions. Can the CAISO be more clear as to which systems / EESC functions you are seeking updates to? This will enable EESCs to ensure the right party is selected.
For responsibility #3, is that specific to the time the terminating entity remains in WEIM? If so, SRP requests the language specify that.
For responsibility #4, SRP is unclear what testing would mean for the terminating entity. This responsibility seems more applicable to a WEIM Entity that would be affected by a terminating Entity. Please provide more information on expectations for the terminating entity.
9/16/2026 3:10 PM
Logged By - marcie.martin@srpnet.com (CAISO)
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The ISO's response to your questions has been posted in the document titled: PRR 1705 - ISO response to initial comments.
9/21/2026 4:36 PM
Responded By - Madrigal, Radha (CAISO)
BPA's primary concern centers on the ambiguous scope and system burden associated with the requirement for terminating entities to "retain functionality needed for ongoing EIM Entity Scheduling Coordinator obligations."
Ambiguity of "Ongoing Obligations" & Software Lifecycle:
• Issue: Post-termination, maintaining specialized WEIM interfaces, telemetry feeds, dynamic scheduling links, and settlement platforms places a substantial financial and administrative burden on an entity transitioning out of the market.
• Request: CAISO must explicitly delineate which specific EIM Entity Scheduling Coordinator (EESC) obligations persist beyond the effective termination date (e.g., historical settlement recalculations vs. active scheduling/telemetry) and specify the duration for which these systems must remain functional.

9/16/2026 1:23 PM
Logged By - sleaton@bpa.gov (CAISO)
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The ISO's response to your questions has been posted in the document titled: PRR 1705 - ISO response to initial comments.
9/21/2026 4:37 PM
Responded By - Madrigal, Radha (CAISO)
Recommendation Comments
No Recommendation Comments available for this PRR.
Attachments