RSS Feed for Proposed Revision Request - 1663

PRR - 1663

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Impact Analysis for PRR - 1663

-By Madrigal, Radha on Monday, March 2, 2026 10:19:11 AM

Announcement for PRR - 1663

Description: Please note updated PRR attachment posted 3/3/26
-By Madrigal, Radha on Tuesday, March 3, 2026 5:17:41 PM

Initial Comment for PRR - 1663

Description: Please see Southern California Edison's comments.
-By John Diep (Southern California Edison) on Tuesday, March 17, 2026 2:10:05 PM

Initial Comment for PRR - 1663

Description: The Six Cities have the following questions concerning revisions included in the indicated sections for PRR 1663 - - Re § 7.1.2(9) - - The Six Cities have been unable to locate any tariff section relating to the concept of overlapping RA capacity described in § 7.1.2(9), and the reference to a “true-up settlement” is unclear. What would be “trued-up” in the situation of overlapping capacity. The Six Cities request that the CAISO provide additional explanation regarding the purpose and mechanics for the described LSE-RA Resource True-up settlement, including an illustrative example. Re § 7.4, next to last paragraph - - The language stating that “[t]he SC will be able to adjust or cancel reassignment for future TDs that have not had the DAM run for that TD” appears to conflict with the requirement that reassignments be submitted and approved by 8:00 a.m. on the calendar day before the trading day. The Six Cities request that the CAISO clarify the timing for submission of an adjustment to or cancellation of a reassignment.
-By Bonnie Blair (Cities of Anaheim, Azusa, Banning, Colton, Pasadena, and Riverside, CA) on Tuesday, March 17, 2026 2:32:27 PM

Initial Comment for PRR - 1663

Description: PG&E’s comment: this section establishes an 8:00 AM Day Ahead Market reassignment deadline on the calendar day prior to the trading day. PG&E notes that this 8:00 AM deadline is not specified in the tariff, so this can be altered if the BPM review process determines that it should. In PG&E’s view, an 8:00 AM deadline impacts dependencies outside of the ISO. Notably, the EDAM entities that are being reassigned to will require the source information before the 8:00 AM deadline. Given current trading and scheduling practices, confirming a source (EDAM or non-EDAM) before 8:00 AM is difficult and often not possible. This could result in an increase in unspecified schedules being submitted to the ISO. The ISO should clarify the intended purpose of the 8:00 AM deadline and consider whether an adjusted reassignment timeline is necessary in light of the intertie scheduling realities and third party SC approval requirements.
-By Alan Meck (PG&E) on Tuesday, March 17, 2026 4:27:55 PM

Recommendation Comment for PRR - 1663

Description: We have received written comments from Jake McDermott on behalf of Terra-Gen on 4/7/26. Please see attached. In addition, the following notes were provided for context: There are redlines in the attached doc on page 89 relevant to the NGR (Non-REM) for the summary of bidding requirements for resources providing RA capacity. (See Sec 7.1.1.). Terra-Gen recommends these redlines as needed changes to PRR 1663 to account for the fuel-limited nature of hybrid resources participating as NGRs. Without those redlines, the CAISO would assume that resources are required to submit RUC/RCU/RCD bids during all hours of the day which may not be possible for hybrids overnight.
-By Madrigal, Radha on Tuesday, April 7, 2026 11:39:01 AM

Recommendation Comment for PRR - 1663

Description: We have received written comments from Cathleen Colbert on behalf of Vistra on 4/14/26. Please see attached.
-By Madrigal, Radha on Wednesday, April 15, 2026 9:03:04 AM

Recommendation for PRR - 1663

Proposed Language:

See attached

Apparent Requirement: CAISO reply comments to initial comments are attached to PRR.
Action: Approve the BPM PRR as submitted
Effective Date: 05/01/2026