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​TSR Study and 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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To request previously posted materials, send an email to with your name, company, and email address.

TSEP Documents

Final Notice of 2022 Cluster Study (Posted 8/11/2021) 
Advance Notice of 2022 Cluster Study and Information on Timeline and Eligibility for Participation (Posted 6/17/21)
2019 Cluster Study Results Overview (Posted 5/21/19)
2016 Cluster Study Results Overview (Posted 6/14/17)

Common Documents
TSEP Business Practice
2022 NT Data Exhibit (updated 6/16/2021)
2022 PTP Data Exhibit (updated 6/16/2021)

Related Links

Requesting a Study
Becoming a Customer web page
Business Practices
Open Access Transmission Tariff
Transmission Project Page
ATC Methodology