The company filed an Underwriting Agreement dated March 10, 2026 in connection with the offering of $600,000,000 of 5.10% Notes due 2036 as Exhibit 1.1.

1. 01

   The company filed an Underwriting Agreement dated March 10, 2026 in connection with the offering of $600,000,000 of 5.10% Notes due 2036 as Exhibit 1.1.

2. 02

   The company filed the Thirty-Third Supplemental Indenture relating to the issuance of $600,000,000 of 5.10% Notes due 2036 and the Note of 5.10% Notes due 2036 as Exhibits 4.1 and 4.2.

3. 03

   The company disclosed estimated expenses of $1,494,186 relating to the offering of $600,000,000 of 5.10% Notes due 2036 by Arizona Public Service Company, with Rating Agency fees of $1,300,000.

4. 04

   The company said these exhibits are filed pursuant to the Registration Statement on Form S-3 (No. 333-277448 and No. 333-277448-01) that became effective on February 28, 2024, and included the legal opinion of Shirley A. Baum as Exhibit 5.1.

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