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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Grid Access Transformation (GAT) Future State: Proactive Planning & Accelerate Expansion

BPA will be providing a public update on the Proactive Planning and Accelerate Expansion components of its Grid Access Transformation program. Materials will be posted prior to the meeting on the

TC-28 Pre-Proceeding Workshop

BPA will hold a series of monthly pre-proceeding workshops from April through December 2026 to discuss proposed changes to BPA’s tariff to enable BPA’s participation in the Southwest Power Pool (SPP) Markets+ day ahead market.