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Proposed Revision Request Detail Help
PRR Life Cycle*****Stakeholder Meeting on Recommendation****
PRR Details
PRR #
1665
Title Initial version of extended day-ahead market BPM
Date Submitted 3/2/2026 10:20 AM
PRR Category C
Priority Normal
Owner Martin, Michael (CAISO)
Status Stakeholder Meeting on Recommendation
Status End Date 4/14/2026 11:59 PM
Related BPM Extended Day-Ahead Market
BPM Section New BPM
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Existing Language

​NA

Proposed Language

​​NA​

Reason For Revision

​​ The Extended Day-Ahead Market (EDAM) is an extension of CAISO’s Day-Ahead Market across balancing authority areas of the West participating in the Western Energy Imbalance Market (WEIM).  This business practice manual is a guideline for EDAM participants and will outline the processes in EDAM​.

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 agreement to update per items captured in the PRR Change Management Review​

Identification of the authorship of comments

Approve with agreement to update per items captured in the PRR Change Management Review
Action

Approve the BPM PRR as modified.

Several items were captured and will be posted 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
This PRR has been reclassified under the Extended Day-Ahead Market BPM.
Posted On - 3/16/2026 2:10 PM
New PRRs related to the Extended Day-Ahead Market (EDAM) are temporarily displayed under the Market Operations BPM. The EDAM BPM category is being added to the PRR tool and items will be recategorized before the 3/24 BPM meeting. Thank you for your patience.
Posted On - 3/2/2026 11:05 AM
Impact Analysis
Notes:
Because the EDAM BPM is new and has no prior version for comparison, PRRs submitted for this BPM do not require an Impact Analysis (IA) form. An IA will be required for future revisions once the initial EDAM BPM is established.
Initial Comments
• Section 3.1.2 Transfer System Resource Types
PG&E’s comment: request for clarity on Type 1 and Type 2 TSR registration requirements and on interactions of CAISO BAA SCs with EESCs more broadly. There is ambiguity on the entity responsible for EESC matching and TSR matching.

• Section 18.2.3: Intertie Schedules at EDAM Balancing Area Interties (Non-CAISO)
PG&E’s comment: for intertie scheduling at the EDAM BA interties, it is stated that SC may “pre-register system resource in anticipation of submission of intertie schedules recognizing the Masterfile processing timelines” but does not provide a specific lead time or expectation of time requirements. Given that CAISO Masterfile changes typically have a range before finalization, there is a risk of SCs being unable to register in time for the May 1 go-live. Please provide a firm deadline for pre-registration of system resources.

• Section 18.2.4.2: Intertie Schedules at CAISO Balancing Area Interties with an EDAM Balancing Area
PG&E’s comment: The BPM does not specify how an ‘RPS contract’ is verified or whether the SC needs to self-attest. We request more detail that includes:
o An explicit verification process, 
o Clarity on the treatment of RA contracts with sources outside both EDAM and non-EDAM BAAs (e.g., generation in a non-EDAM BAA wheeling through PACE), and
o Also this section notes that this is transitional. PG&E would like to see a clear sunset timeline for the transitional period.

• Section 20.5.2: Initial Conditions
PG&E’s comment: the use of projected initial SOC for battery resources in the DA will induce reliance on real-time telemetry accuracy, however the BPM does not specify the source or the tolerance of this telemetry (either SC-submitted or by SCADA). We request the following clarifications: 
o The SOC data source (CAISO telemetry vs. SC SIBR submission), 
o The process for correcting erroneous SOC initial conditions, and 
o Whether the SC can trigger a correction request analogous to the existing initial condition correction process.
3/17/2026 4:29 PM
Logged By - Alan Meck (PG&E)
Recommendation Comments
CAISO EDAM - DAME Implementation PRR 1665 EDAM BPM - Vistra.pdf    
We have received written comments from Cathleen Colbert on behalf of Vistra on 4/15/26. Please see attached.
4/16/2026 8:02 AM
Logged By - Madrigal, Radha (CAISO)
WPTF is assuming the CAISO will update the entire GHG section based on the changes discussed during Parallel Ops calls. We ask that the CAISO provide another opportunity for stakeholders to review the updated language and provide additional feedback.
4/14/2026 2:09 PM
Logged By - Gridwell Consulting for WPTF (Western Power Trading Forum)
Attachments