ATC Methodology

This page contains BPA's ATC methodologies for the NERC (short-term) and Planning (long-term) horizons and other related information. You can find tools and reports to help evaluate and analyze transmission availability here. 

NERC Horizon (0 - 13 months)

ATC Implementation Document, V75
(Effective 1/20/2023) 

ATC Implementation Document Version History, V75
(Effective 1/20/2023)

System Operating Limits Methodology for the Operations Horizon

TRM Implementation Document, V8 (MOD-008-1) 
(Effective 10/21/2022)

Map of Short-term BPA Constraints 
(Effective 1/26/2022)

Data Request Form (MOD-001-1 R9) *
(07/28/2020) 

TTC Study Report Request Form (MOD-029-1 R4) *
(08/29/2019) 

* The forms above are only for use by the specific entities identified in each form. Send all completed forms to nercatcstandards@bpa.gov with the name of the form in the subject line.

Planning Horizon (beyond 13 months)

ATC Methodologies for the Planning Time Period V18 
(Effective: 5/14/2021)

Map of Long-term BPA Constraints 
(Effective 1/26/2022)

Long-term ATC Base Case Assumptions for 2027 and 2032 
(Effective 1/9/23)

Reference Documents

Contact Information

Send all requests or documents pertaining to specific requirements in the NERC ATC Standards to nercatcstandards@bpa.gov and specify the name of the document or request form in the subject line. For comments or questions about ATC and AFC, email techforum@bpa.gov and specify ATC-related in the subject line.

To receive emails about ATC Methodology updates and Customer Involvement meetings, select the techforum mail list check box on the sign-up form.

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