BPM change management: Proposed revision requests and updated BPMs posted as of 8/4/26

The California ISO (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 Aug. 4, 2026, through Aug. 18, 2026.

New ISO PRRs:

• PRR 1687 Settlements and Billing BPM, Emergency settlement release to fix high priority settlement variances

• PRR 1688 Market Operations BPM, Formula details on fifteen minute market ex-post capacity calculations 

• PRR 1689Settlements and Billing BPM, Emergency settlement release to fix high priority settlement variances

• PRR 1690 Market Operations BPM, Clarification on tagging megawatts back into CAISO BA from a non-contiguous portion of CAISO BA

• PRR 1691 Market Instruments BPM, Adding references back to market ops BPM on circular scheduling

• PRR 1692 Settlements and Billing BPM, Day-ahead contingency analysis as a service charge

• PRR 1693 Reliability Requirements BPM, 2027 Availability assessment hours

• PRR 1694 Energy Imbalance Market BPM, Clarification on the net intertie transmission constraint design and flexible ramping product

ISO Recommendations:

• PRR 1680 Settlements and Billing BPM, Emergency day-ahead market enhancement and extended day-ahead market fixes for high priority variances

• PRR 1681 Settlements and Billing BPM, Emergency settlement release to fix congestion revenue allocation related congestion calculations

• PRR 1682 Market Operations BPM, Updates to the admin pricing process for the market separation or isolation of the western energy imbalance market or extended day-ahead market  

• PRR 1683 Generator Management BPM, Commercial operation for markets and other clarification, and general document cleanup

• PRR 1684 Reliability Requirements BPM, Resource transitions from inside to outside the ISO balancing authority area

• PRR 1685 Market Instruments BPM, Addition of extended day ahead market balancing authority area aggregated transfers open access same time information system report

• PRR 1686 Market Instruments BPM, Shift factor report updated to reflect the new deployment scenario column / attribute added by the extended day-ahead market

ISO Final Decisions:

• PRR 1673 Settlements and Billing BPM, Emergency day-ahead market enhancements and extended day-ahead market incremental updates to PRR 1662

• PRR 1674 Settlements and Billing BPM, Emergency settlement fixes for high priority variances

• PRR 1675 Scheduling Coordinator Certification and Termination BPM, Clarifying 24/7 real time phone number and testing requirements

• PRR 1677 Outage Management BPM, Clarify outage reporting requirements for non-generator resources and add storage-related cause descriptions to the plant trouble nature of work category

• PRR 1678 Market Operations BPM, Clarification on how storage resources are subject to ancillary service state of charge constraints and envelope constraints

• PRR 1679 Direct Telemetry BPM, Updates to battery point definitions

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.

Meeting information