Notification of revised ISO operating procedures 1210, 2210Z, 2340, 2510, 2510A, 2510B, 2520, 2530, 2540, 2550, 5750 and new 3200A issued

The California ISO has revised the operating procedure(s) referenced below. 

1210 Day-Ahead Market, version 19.8, effective Oct. 1, 2025. 

Updated from Manager of Real-Time Operations to Manager, Balancing Authority (BA) Operations or Manager of BA Operations in some instances. Updated from Director of Real-Time Operations to Director, BA Operations.

Section D.3.1: Added more information on the determination of contingency reserves based upon the sudden loss of transmission equipment. Replaced net actual Interchange with Actual Net Interchange (NIA), per BAL-004-WECC-4 update for 10/01/25.

Added BAL-004-WECC-4 to WECC Criterion in References.

Minor formatting and grammar edit throughout and removed history prior to five years.

2210Z Effectiveness Factors - All, version 29.6, effective Oct. 1, 2025. 

7240: Updated Table 5 to Table 5b due to new Table 5a in 7240 procedure - version 14.4, effective 9/25/25.

7320: Added Kola Battery effectiveness factors to Table 3A for CP#s 2, 3, 4, 11, and 13 – version 25.1, effective 9/25/25.

Updated version and date only for the following: 

• 6310: version 26.4, effective 10/01/25
• 7340: version 4.1, effective 9/25/25

2340 Ancillary Service Availability Validation, version 3.5, effective Oct. 1, 2025. 

Section 3.1, Item 2: Updated from "net actual Interchange" to "Actual Net Interchange (NIA), per BAL-004-WECC-4 update on 10/01/25.

References: Removed information from “Other References” that are no longer applicable.

Minor formatting and grammar edits and removed history prior to five years. 

2510 NERC and CAISO Tagging Requirements, version 10.3, effective Oct. 1, 2025.

In Section 1 under Western Electricity Coordinating Council (WECC) Interchange Tool (WIT), updated from NSI to NIS (Scheduled Net Interchange) and from NAI to NIA (Actual Net Interchange), and in Section 3.1.1 updated from Net Scheduled Interchange to Scheduled Net Interchange (NIS) to align with BAL-004-WECC-4 update on 10/01/25.

References: Added BAL-004-WECC-4 to North American Electric Reliability Corporation (NERC) Requirements.

Updated from Manager of Real-Time Operations to Manager, BA Operations. Minor formatting and grammar edits and removed history prior to five years.

2510A POR/POD (Point of Receipt/Point of Delivery)-Scheduling Path Cross-Reference, version 12.6, effective Oct. 1, 2025

Updated to include PINALCENTRAL intertie with Salt River Project (SRP). Minor formatting and grammar edits and removed history prior to five years.

2510B CAISO Tagging Templates, version 1.8, effective Oct. 1, 2025.

Updated to include PINALCENT500 tab.

2520 Real-Time and After-the-Fact Check Out, version 9.2, effective Oct. 1, 2025.

Updated from Net Scheduled Interchange (NSI) to Scheduled Net Interchange (NIS) and from Net Actual Interchange (NAI) to Actual Net Interchange (NIA) to align with BAL-004-WECC-4 update on 10/01/25. Updated WECC Criterion in References section. Minor formatting and grammar edits and removed history prior to five years.

2530 Manual Dispatch on Interties, version 7.2, effective Oct. 1, 2025.

Updated from Manager, Real-Time Operations and Manager of Real-Time Operations to Manager, BA Operations and Manager of BA Operations. Updated from Net Scheduled Interchange (NSI) to Scheduled Net Interchange (NIS) and from Net Actual Interchange (NAI) to Actual Net Interchange (NIA) to align with BAL-004-WECC-4 update for 10/01/25. Minor formatting and grammar edits.

2540 Interchange Schedule Curtailments, version 7.3, effective Oct. 1, 2025. 

Updated from NET Scheduled Interchange (NSI) to Scheduled Net Interchange (NIS) to align with BAL-004-WECC-4 update on 10/01/25. Updated from Manager of Real-Time Operations to Manager of Balancing Authority (BA) Operations. Minor formatting and grammar edits and removed history prior to five years.

2550 Inadvertent Interchange ATEC Payback, version 6.5, effective Oct. 1, 2025. 

Updated to align with BAL-004-WECC-5 standard update, incorporating requirements of calculating ATEC on 10/01/25. Updated from Manager of Real-Time Operations to Manager, Balancing Authority (BA) Operations. Minor formatting and grammar edits and removed history prior to five years.

3200A Operations for Extreme Weather, version 1.0, effective Oct. 1, 2025. 

First issue created. 

5750 Settlement Quality Meter Data (SQMD) Plan - Submission & Approval Process (External), version 2.5, effective Oct. 1, 2025. 

Periodic Review: Minor formatting and grammar edits and removed history prior to five years.

The California ISO’s operating procedures are available on the Operating Procedures webpage.