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Open Access Transmission Tariff
The Open Access Transmission Tariff (OATT) defines the terms and conditions of point-to-point and network integration transmission services offered by BPA Transmission Services.
Current OATT  (expires on Sept. 30, 2019)
The attachments below are included in the OATT above, but are also posted individually for convenience.
Attachment L (LGIP) (4/26/2016)
Attachment N (SGIP) (4/26/2016)
​OATT (effective beginning Oct. 1, 2019)

​On March 1, 2019, BPA issued the Administrator's Final Record of Decision in the TC-20 Terms and Conditions Tariff Proceeding adopting the TC-20 Settlement Agreement, which includes the terms and conditions of an OATT to be effective on Oct. 1, 2019 and an associated Business Practice Process.

TC-20 Settlement Open Access Transmission Tariff (Effective: 10/1/2019)

Transmission Business Practice Development Process

Documents related to the TC-20 Proceeding, including the Administrator’s Final Record of Decision, are available on the TC-20 Tariff Proceeding page. Documents related to implementation of the TC-20 Settlement Agreement are available on the TC-20 Settlement page.

Reference Documents

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