Open Access Transmission Tariff

The Open Access Transmission Tariff (Tariff) defines the terms and conditions of point-to-point and network integration transmission services, ancillary services, and generator interconnections offered by BPA Transmission Services.

BPA Tariff Effective Jun. 30, 2024

On Jan. 26, 2024, BPA issued the Administrator's Final Record of Decision in the TC-25 Terms and Conditions Tariff Proceeding adopting the modified terms and conditions of the Tariff to be effective on Jun. 30, 2024.

Open Access Transmission Tariff, effective Jun. 30, 2024
TC-25 Tariff Proceeding
 
 
The attachments below are included in the OATT above, but are also posted individually for convenience.
Attachment C (ATC Methodology) (6/30/2024)
Attachment L (LGIP) (6/30/2024)
Attachment N (SGIP) (6/30/2024) 
Attachment Q (EIM) (6/30/2024)
Attachment R (LGI Transition Process) (6/30/2024)
 

Reference Documents

Customer Reciprocity Statements (2/24/2012)
Attachment E: PTP Customer List (04/09/2025)
Attachment I: NT Customer List (04/09/2025)
OATT Interest Rates 
 

Open Access Transmission Tariff Archive

This is the archive for expired BPA Open Access Transmission Tariffs.
Tariff adopted in TC-24 (expired 6/29/2024)
Tariff adopted in TC-22 (expired 9/30/2023)
Tariff adopted in TC-20 (expired 9/30/2021)
Open Access Transmission Tariff (expired 9/30/2019)