Notice
April 24, 2023
REQUESTED ACTION
Information Only
CATEGORIES
Markets
Adjustment to GMC rates and WEIM administrative fees effective trade date 5/1/23
MESSAGE

The California ISO is experiencing year-to-date over-recovery of the Grid Management Charge (GMC), specifically in the Market Services and System Operations categories. The May 1, 2023 proposed rate decreases will attempt to align the respective categories’ forecasted collected revenue to the budgeted revenue and will minimize the impact of over collections on future rates. Changes to the Market Services and System Operations rates will also cause the corresponding Western Energy Imbalance Market (WEIM) rate to change. The chart below outlines the GMC category revenue collections forecast for the year.

 

Budgeted versus Forecast Revenues by GMC Service Category

Service Category

Budgeted Amount

Revenue

Forecast

Difference

Percent

Market Services

$97,520,356

$107,695,711

$10,175,355

10.43%

System Operations

$98,035,776

$102,348,529

$  4,312,753

   4.40%

 

Pursuant to Appendix F, Schedule 1, Part B of the ISO Tariff, the ISO will adjust these GMC rate components effective trade date May 1, 2023.

 

Summary of Proposed Rate Changes

Charge Code

Current Rate

Proposed New Rate

Difference

4560 Market Services

$0.1513

$0.1320

$0.0193

4561 System Operations

$0.2167

$0.2070

$0.0097

4564 WEIM System Operations

$0.2037

$0.1867

$0.0170

 

The Congestion Revenue Rights (CRR) Services and Reliability Coordinator service charges remain unchanged. The ISO will continue to monitor and assess its revenue collections throughout the year and will make rate adjustment recommendations, up or down, as necessary pursuant to the ISO tariff.

 

An updated GMC rates sheet with the new rates effective as of the May 1, 2023 trade date is available on the Settlements page of the ISO website.

CONTACT INFORMATION

Contact your Customer Service representative or call ISO Customer Service at 916-608-7320 with any questions.

California Independent System Operator | P.O. Box 639014 | Folsom, CA 95630 | United States
Copyright © 2023 California Independent System Operator. All rights reserved.