Updated Wheeling Access Charge Rates effective 6/1/25

The California ISO has posted the following updated wheeling access charge rates effective as noted below on its settlements webpage, under the Transmission access charge (TAC) rates/Wheeling access rates/Wheeling rates 2026 subheadings.

These rates will be included in the settlement calculation of transmission access charge transactions starting on the following trade dates:

Wheeling Access Rates	FERC Order	FERC Order Date
Rates effective June 1, 2025	San Diego Gas & Electric’s 2026 TRR information under Docket Numbers ER25-270	22-Jun-26

Rates effective June 1, 2025:

Sep. 1, 2026 – T+9B Initial Statement
June 12, 2026 – T+70B Recalculation Statement
Oct. 14, 2025 – T+11M Recalculation Statement
June 1, 2025 – T+21M Recalculation Statement

Contact information

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