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Debt and Liquidity Matters | 9 Months Ended
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Sep. 30, 2025
Debt Disclosure [Abstract] |
Debt and Liquidity Matters | Debt and Liquidity Matters Pinnacle West and APS maintain committed revolving credit facilities in order to enhance liquidity and provide credit support for their commercial paper programs, to refinance indebtedness, and for other general corporate purposes. Pinnacle West As of September 30, 2025, Pinnacle West had a $200 million revolving credit facility that matures on April 10, 2029. Pinnacle West has the option to increase the amount of the facility up to a total of $300 million upon the satisfaction of certain conditions and with the consent of the lenders. Interest rates are based on Pinnacle West’s senior unsecured debt credit ratings and the agreement includes a sustainability-linked pricing metric which provides for an interest rate reduction or increase, by meeting or missing, respectively, targets related to specific environmental and employee health and safety sustainability objectives. Under certain circumstances, the sustainability-linked pricing metric can be terminated for the final year of the credit facility. The facility is available to support Pinnacle West’s general corporate purposes, including support for Pinnacle West’s $200 million commercial paper program, for bank borrowings or for issuances of letters of credit. As of September 30, 2025, Pinnacle West had no outstanding borrowings under its revolving credit facility, no letters of credit outstanding under its credit facility, and $55 million of outstanding commercial paper borrowings. The weighted-average interest rate for the outstanding borrowings on September 30, 2025 was 4.28%. Pinnacle West also has an outstanding 364-day $200 million term loan facility that matures on December 4, 2025. Borrowings under the facility bear interest at SOFR plus 0.95% per annum. On December 20, 2024, Pinnacle West drew the full amount of $200 million. On May 15, 2025, Pinnacle West issued $400 million of 4.90% senior unsecured notes that mature May 15, 2028 and $400 million of 5.15% senior unsecured notes that mature May 15, 2030. The net proceeds from the issuances were used to repay $500 million of 1.3% senior unsecured notes that were maturing June 15, 2025 and for general corporate purposes. On February 28, 2024, Pinnacle West entered into equity forward sale agreements (the “February 2024 Forward Sale Agreements”), which may be settled with Pinnacle West common stock or cash. Pinnacle West also has an at-the-market equity distribution program (the “ATM Program”) under which it may offer and sell common stock and enter into forward sale agreements from time to time, subject to market conditions and other factors. In August 2025, Pinnacle West amended the February 2024 Forward Sale Agreements with Wells Fargo Bank, National Association to extend the maturity date to December 31, 2026. In September 2025, Pinnacle West partially settled the February 2024 Forward Sale Agreements by issuing 243,186 shares of common stock and receiving net proceeds of $15 million. The proceeds were recorded in equity and were used for general corporate purposes. See Note 12 for more information on the February 2024 Forward Sale Agreements and the ATM Program. Pinnacle West also has $525 million of 4.75% Convertible Senior Notes due 2027 (“Convertible Notes”) outstanding, which are senior unsecured obligations of Pinnacle West and will mature on June 15, 2027. See Note 12 for more information. APS As of September 30, 2025, APS had a $1.25 billion revolving credit facility, that matures on April 10, 2029. APS has the option to increase the amount of the facility by up to a maximum of $400 million, for a total of $1.65 billion, upon the satisfaction of certain conditions and with the consent of the lenders. Interest rates are based on APS’s senior unsecured debt credit ratings, and the agreement includes a sustainability-linked pricing metric which provides for an interest rate reduction or increase, by meeting or missing, respectively, targets related to specific environmental and employee health and safety sustainability objectives. Under certain circumstances, the sustainability-linked pricing metric can be terminated for the final year of the credit facility. The facility is available to support APS’s general corporate purposes, including support for APS’s $1 billion commercial paper program, for bank borrowings or for issuances of letters of credit. As of September 30, 2025, APS had no outstanding borrowings under its revolving credit facility, no letters of credit outstanding under the credit facility, and $421 million of outstanding commercial paper borrowings. The weighted-average interest rate for the outstanding borrowings on September 30, 2025 was 4.26%. On December 5, 2024, APS entered into a $400 million 364-Day Term Loan Agreement that matures on December 4, 2025. Borrowings under the facility bear interest at SOFR plus 0.90% per annum. APS drew the full amount of $400 million on April 29, 2025 and repaid it on August 15, 2025 using proceeds from the unsecured senior notes issuances discussed below. On August 15, 2025, APS issued $700 million of 5.90% senior unsecured notes that mature August 15, 2055 and reopened its 5.70% senior unsecured notes that mature August 15, 2034, issuing an additional $250 million of such notes. The net proceeds from the issuances were used to repay the $400 million 364-day Term Loan agreement discussed above and for general corporate purposes. On May 15, 2025, Pinnacle West contributed $300 million into APS in the form of an equity infusion. APS used this contribution to repay the $300 million of 3.15% senior notes that matured on the same date. The ACC has authorized a limit on yearly equity infusions into APS equal to 2.5% of APS’s total assets each calendar year on a three-year rolling average basis, subject to APS’s equity ratio remaining below the most recently approved rate case capital structure plus 50 basis points. See “Financial Assurances” in Note 10 for a discussion of other outst anding letters of credit. Debt Fair Value Our long-term debt fair value estimates are classified within Level 2 of the fair value hierarchy. The following table presents the estimated fair value of our long-term debt, including current maturities (dollars in thousands):
| As of September 30, 2025 |  | As of December 31, 2024
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Pinnacle West | $ | 1,664,583 |  |  | $ | 1,733,630 |  |  | $ | 1,367,770 |  |  | $ | 1,393,744 |
APS | 8,139,676 |  |  | 7,468,657 |  |  | 7,490,878 |  |  | 6,525,248 |
Total | $ | 9,804,259 |  |  | $ | 9,202,287 |  |  | $ | 8,858,648 |  |  | $ | 7,918,992 |

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