BPM change management: Proposed revision requests and updated BPMs posted as of 10/1/25.

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 Oct. 1, 2025, through Oct. 15, 2025.

New ISO PRR’s

PRR 1639 Market Operations BPM; Remove sunset of AET and add provision for RC Action

PRR 1640 BPM Change Management BPM; New PRR status, additional and general PRR updates

PRR 1641 Market Operations BPM; Ability for CAISO to initiate verification from resource owner

PRR 1642 Generator Interconnection and Deliverability Allocation Procedures BPM; Intra-cluster prioritization deliverability clarification

PRR 1643 Generator Management BPM; Limited Operation Study Deliverability Clarification

PRR 1644 Generator Interconnection and Deliverability Allocation Procedures BPM; Stand-Alone Network Upgrade Clarification

PRR 1645 Generator Management BPM; Commercial Viability Criteria PPA demonstration

PRR 1646 Reliability Requirements BPM; Mixed-Fuel Resource FCDS and NQC clarification

PRR 1647 Generator Interconnection and Deliverability Allocation Procedures BPM; Clarification of project financial security posting requirements

PRR 1648 Market Operations BPM; Ancillary Services Certification and Testing

PRR 1649 Compliance Monitoring BPM; Request for additional data

PRR 1650 Market Operations BPM; New Market Automation to prevent Market Disruptions in RTD and STUC

ISO Recommendations

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; Subscriber Participating Transmission Owner Updates

ISO Final Decisions

No Final Decisions at this time.