2024 NERC/WECC Metered Demand Calculations for Assessment Year 2026

The California ISO has posted North American Electric Reliability Corporation/Western Electricity Coordinating Council (NERC/WECC) information files to the Market Results Interface - Settlements (MRI-S) and the Secure File Transfer Protocol (SFTP) server on June 5, 2025. The files contain the NERC/WECC metered demand for assessment year 2026 for scheduling coordinator (SC) review, pursuant to ISO tariff section 11.20.4(a).

Information files can be retrieved in MRI-S by selecting NERC WECC INFO as the run type and setting the post date to June 5, 2025. The files are available on MRI-S and SFTP for 45 calendar days after publication. SCs are advised to download the files for validation purposes and future reference.

2024 NERC/WECC metered demand is the summation of monthly NERC/WECC metered demand quantities published previously in the T+11M recalculation statements for January 2024 through June 2024, and T+70B recalculation statements for July 2024 through December 2024. Details regarding assessment of Charge Code 6490 NERC/WECC Charge are provided in the Settlements and Billing Business Practice Manual (BPM) configuration guide.

The NERC/WECC information files combined with this market notice shall serve as written notification of each SC's NERC/WECC metered demand for 2024.

Beginning June 5, 2025, each SC will have 60 calendar days to raise any disputes concerning the data calculation.