BPM change management: Proposed revision requests and updated BPMs posted as of 9/3/25

The California ISO has posted new Proposed Revision Requests (PRRs) reflecting edits to Business Practice Manuals (BPMs). Revised BPMs that have completed the BPM change management process are posted in the BPM Library. All PRRs and related activity are publicly available through the BPM change management site.

BPM PRR updates are part of the ISO Daily Briefing in addition to being listed in the “Announcement” sections of the BPM change management tool. These updates include PRRs that have become available for review, upcoming BPM meetings, and comment due dates. All registered BPM users should continue to reference the BPM Change Management tool to see current PRR status. Subscribe to the Daily Briefing to stay up to date.

The PRRs listed below have an open 10-business day comment or appeal period from Sept. 3, 2025, through Sept. 17, 2025.

New ISO PRR’s

PRR 1635 Reliability Requirements BPM, 2026 Availability Assessment Hours

PRR 1636 Generator Interconnection and Deliverability Allocation Procedures BPM, Emergency PRR, Updates related to implementing the shared Network Upgrade topic from the Interconnection Process Enhancements 2023 – Track 2 stakeholder initiative 

PRR 1637 Credit Management and Market Clearing BPM, Various revisions related to Phase One of Billing, Payment and Credit Enhancements as approved by FERC on 1/28/25

PRR 1638 Generator Interconnection and Deliverability Allocation Procedures BPM BPM, Subscriber Participating Transmission Owner Updates

ISO Recommendations

No PRR’s in this stage. 

ISO Final Decisions

PRR 1634 Outage Management BPM, Emergency PRR, Clarification on generation outage nature of work to include curtailment due to plant configuration parameters

PRR 1633 Generator Interconnection and Deliverability Allocation Procedures BPM, Updates related to the Interconnection Process Enhancements Track 3 stakeholder initiative

PRR 1632 Generator Management BPM, Interconnection process enhancements 2023, FERC order 2023, and miscellaneous updates

BPM Library Updates

The PRR tracking log on the ISO website lists the updated BPMs in the library. 

The ISO may unilaterally make and implement revisions to the BPMs in emergency circumstances, as set forth in Sections 22.4.3 and 22.11 of the ISO Tariff and in Section 2.6 of the Business Practice Manual for BPM Change Management. An emergency PRR will continue through the BPM change management stakeholder process to obtain stakeholder input on the revisions and make other recommendations, as necessary.

Please note that affected parties must register in order to submit a PRR or written comments.

More information on the BPM change management process is available on the BPM webpage of the ISO website.