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Arizona Public Service Company Submits Revisions to Federal Energy Regulatory Commission

Strategic Insights

— 2 min read

Arizona Public Service Company has submitted revisions to Rate Schedule No. 217, Exhibit B, to the Federal Energy Regulatory Commission, as required by Section 205 of the Federal Power Act and Part 35 of the Commission's regulations. The revisions concern the ownership, operation, maintenance, replacement, and financial responsibilities of facilities at established points of interconnection between Arizona Public Service Company and Western Area Power Administration. The filing, which includes revisions to Exhibit B.LIB and Exhibit B.NGA, reflects updates to costs for operations and maintenance of facilities for fiscal years 2026 through 2028 and includes an updated Western Area Power Administration signatory.

Key Takeaways:

  • Arizona Public Service Company, a wholly-owned subsidiary of Pinnacle West Capital Corporation, is a vertically-integrated public utility doing business under the laws of the State of Arizona.
  • The company serves over one million retail electric customers in Arizona and participates in wholesale markets throughout the West.
  • The revisions to Rate Schedule No. 217, Exhibit B, reflect updates to costs for operations and maintenance of facilities for fiscal years 2026 through 2028.
  • The updated Exhibit B.LIB Revision No. 7, Liberty Substation, includes a new line to the table in Section 4.1 for Arc Flash Hazard Analysis and updates to the costs in Section 4.1.
  • The updated Exhibit B.NGA Revision No. 7, North Gila Substation, includes updates to the costs in Section 7.1 for the operations and maintenance of the facilities for fiscal years 2026 through 2028.
  • Arizona Public Service Company is a transmission customer, taking service under its Open Access Transmission Tariff and under the transmission tariffs of other transmission providers in the West.
  • The company is registered with the North American Electric Reliability Corporation for purposes of compliance with the Electric Reliability Standards and performs 10 of the registered NERC functions.

Statistics:

  • Arizona Public Service Company serves over one million retail electric customers in Arizona.
  • The company participates in wholesale markets throughout the West.
  • The revisions to Rate Schedule No. 217, Exhibit B, concern the ownership, operation, maintenance, replacement, and financial responsibilities of facilities at established points of interconnection between Arizona Public Service Company and Western Area Power Administration.
  • The updated Exhibit B.LIB Revision No. 7, Liberty Substation, includes a new line to the table in Section 4.1 for Arc Flash Hazard Analysis.
  • The updated Exhibit B.NGA Revision No. 7, North Gila Substation, includes updates to the costs in Section 7.1 for the operations and maintenance of the facilities for fiscal years 2026 through 2028.

Sources:

  • Arizona Public Service Company. (2025, October 14). Arizona Public Service Company Rate Schedule No. 217, Exhibit B Revisions. Document submitted to the Federal Energy Regulatory Commission. Retrieved from https://elibrary.ferc.gov
  • 16 U.S.C. § 824d (Federal Power Act)
  • 18 C.F.R. Part 35 (2024) (Federal Energy Regulatory Commission's regulations)

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