Preliminary NERC/WECC Charge Settlement Statements and Invoices for Assessment Year 2027

The California ISO (ISO) published preliminary North American Electric Reliability Corporation/Western Electricity Coordinating Council (NERC/WECC) statements and invoices for 2027 NERC/WECC charges to the Market Results Interface-Settlements (MRI-S) and the Secure File Transfer Protocol (SFTP) server on Aug. 11, 2026. The charges for assessment year 2027 appear on the NERC/WECC initial statement under charge code (CC) 6490, with Jan. 1, 2025, as the trade date.

The preliminary NERC/WECC charge rate for assessment year 2027 is provided below for scheduling coordinators' information pursuant to ISO Tariff section 11.20.4

Item	Value	Unit
Total NERC/WECC Charge for Assessment Year 2027	10,218,237.90	$
Total NERC/WECC Metered Demand for Calendar Year 2025	206,655,504.21	MWh
Preliminary NERC/WECC Charge Rate for Assessment Year 2027	0.068744605	$/MWh

Payments for the preliminary NERC/WECC charges are due by 10 a.m. Pacific Time on Sep. 10, 2026, pursuant to ISO Tariff section 11.20.5

On May 26, 2026, the ISO posted NERC/WECC information files to the MRI-S and the SFTP server in accordance with the approved tariff provisions for review by scheduling coordinators.

Contact information

Please contact ISO Customer Service at 916-608-7320 with any questions.