TC-26 Tarriff Proceeding

Section 9 of Bonneville's Open Access Transmission Tariff (Tariff) provides that the Bonneville Administrator may use the procedures set forth in Section 212(i)(2)(A) of the Federal Power Act to modify terms and conditions of the Tariff. The TC-26 Tariff Proceeding largely follows rate case procedures. 

Federal Register Notice Publication

The Federal Register Notice (FRN) announcing the commencement of the TC-26 tariff proceeding was published on Wednesday, Nov. 13, 2024.

•  Federal Register Notice of the TC-26 Initial Proposal

•  TC-26 Settlement Agreement (including Appendix 1, Terms, and Appendix 2, Bonneville’s Open Access Transmission Tariff)

Ex Parte Rules

With publication of the FRN, a prohibition of ex parte communications has begun and will remain in effect throughout the duration of the tariff proceeding. BPA’s Rules of Procedure prohibit ex parte communications during the TC-26 tariff proceeding. Please refer to BPA’s letter to parties interested in the TC-26 tariff proceeding for additional information on the ex parte rule.

Release of BPA’s Initial Proposal

BPA released its Initial Proposal in the TC-26 tariff proceeding on November 22, 2024. Please refer to the Secure Proceedings website to view public documents filed in the TC-26 tariff proceeding.

Prehearing Conferences for TC-26, BP-26, and PRDM-26

The Prehearing Conferences for the TC-26 tariff proceeding, BP-26 rate case, and PRDM-26 proceeding was held on Friday, Nov. 15.

Intervention Instructions
Once the FRN in the TC-26 tariff proceeding is published, any entity or person intending to become a party in the TC-26 proceeding must file a petition to intervene through Bonneville’s secure website. The Rules of Procedure require interventions to be filed on the secure website. Because Bonneville is introducing a new secure website interface, all prospective users must create a new user account to submit an intervention.  User accounts will be approved once the proceeding is active upon the publication of the FRN. The secure website contains a link to the user guide, which provides step-by-step instructions for creating user accounts, requesting access, generating filing numbers, submitting filings, and uploading interventions. 
Interventions must conform to the format and content requirements set forth in BPA’s Rules of Procedure Sections 1010.6 and 1010.11. Interventions for the TC-26 proceeding may be uploaded to the secure website starting the day the FRN is published (Wednesday, Nov. 13, 2024). The deadline for submitting petitions to intervene is 4:30 p.m. on Tuesday, Dec. 3, 2024.
For questions regarding the secure website, prehearing conference, or intervention process, please contact the Hearing Coordinator via email at cwgriffen@bpa.gov or, if the question is time-sensitive, via telephone at (503) 230-5107.

Workshop Materials and Customer Comments

All BP-26 and TC-26 pre-proceedings workshop information and materials, as well as customer comments are posted to the BP-26 Rate Case webpage.

Scheduling Conference for TC-26

BPA held a scheduling conference on Monday, Oct. 28 to review and discuss the proposed procedural schedules for the BP-26 Rate Case, TC-26 Tariff Proceeding, and PRDM-26 Proceedings with prospective parties to each proceeding.

Information and Resources