PSE employs the Formula Rate to calculate its base rates for Network Integration Transmission Service and Point-to-Point transmission service as found in Attachment H-1 and H-2 of the PSE Open Access Transmission Tariff (OATT). The Formula Rate is updated annually in accordance with the Protocols set forth in PSE OATT Attachment H-2. PSE employs an Annual Update Process, which refreshes the calculation of these rates by populating the Formula in the PSE OATT Attachment H-1 with prior-year information from PSE’s Federal Energy Regulatory Commission (FERC) Form No.1, other historical data, including additional detail and company records, and projected net capital additions for the current calendar year. The Annual Update begins each June 1.

PSE holds an Open Meeting each year to provide an opportunity for Interested Parties to obtain information about the Annual Update.

Transmission system details can be found on the PSE OASIS page.