Acquiring Transmission

Available Transfer Capability (ATC) is the transmission inventory that is available over and above committed transmission uses.  BPA calculates ATC using its short-term and long-term methodologies that have been developed to reflect topology, operational reliability, load, and market considerations.  Transmission customers can acquire ATC by submitting Transmission Service Requests on BPA’s OASIS at OATI webSmartOASIS.

Transmission Availability Reports & Tools

Transmission Services provides reports and tools to assist customers as they reserve and schedule transmission.
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ATC Methodology

Learn more about BPA's Available Transfer Capability Implementation Document (ATCID), ATC and Available Flowgate Capability (AFC) Methodologies for the Planning Time Period and other information pertaining to BPA's management and calculation of ATC and AFC.
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TSR Study & Expansion Process

The TSR Study and Expansion Process (TSEP) is BPA’s process to manage and respond to long-term firm transmission requests on the BPA network. TSEP was formerly known as Network Open Season (NOS).
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Latest News & Events

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TC-27 Pre-Proceeding Workshop (Day 1)

BPA will engage customers and stakeholders through a series of workshops in October 2025 through February 2026 to continue the Grid Access Transformation discussions on proposed changes to processes BPA uses to evaluate and expand the transmission system.

TC-27 Pre-Proceeding Workshop (Day 2)

BPA will engage customers and stakeholders through a series of workshops in October 2025 through February 2026 to continue the Grid Access Transformation discussions on proposed changes to processes BPA uses to evaluate and expand the transmission system.