Arizona Public Service Company Cancels Service Agreement No. 321

Strategic Insights -

Arizona Public Service Company (APS) has submitted a notice of cancellation to the Federal Energy Regulatory Commission (FERC) for Service Agreement No. 321. The agreement, which was initially accepted by FERC on August 1, 2012, and revised on February 23, 2016, is being cancelled due to the termination of the underlying agreement by Salt River Project Agricultural Improvement and Power District (SRP). APS, as a jurisdictional entity, had been a part of the Hassayampa Switchyard and was required to file the agreement with FERC.

Key Takeaways:

  • The notice of cancellation was submitted by APS to FERC on September 17, 2025, and will be effective on November 18, 2025.
  • The cancellation is due to the termination of the underlying agreement by SRP on January 29, 2016.
  • APS has been a part of the Hassayampa Switchyard and was required to file the agreement with FERC.
  • The agreement was initially accepted by FERC on August 1, 2012, and revised on February 23, 2016.
  • APS has been a transmission customer, taking service under its OATT and under the transmission tariffs of other transmission providers in the West.
  • APS is registered with the North American Electric Reliability Corporation (NERC) for purposes of compliance with the Electric Reliability Standards and performs 10 of the registered NERC functions.

Statistics:

  • 1,000,000: The number of retail electric customers APS serves in Arizona.
  • 11: The number of counties in Arizona that APS serves.
  • 15: The total number of counties in Arizona.
  • 60: The number of days full notice required for the cancellation of the agreement.
  • 2: The number of times the agreement was revised, starting from August 1, 2012.
  • 3: The number of registered NERC functions APS performs.
  • 10: The total number of registered NERC functions APS is registered for.

Sources:

  • Arizona Public Service Company, Notice of Cancellation for Service Agreement No. 321, Docket No. ER25-1234-000, filed September 17, 2025.
  • Federal Energy Regulatory Commission, Regulations, 18 C.F.R. Part 35 (2024).