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Derivative Accounting (Tables) | 9 Months Ended
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Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Outstanding Gross Notional Amount of Derivatives, which Represents Both Purchases and Sales | The following table shows the outstanding gross notional volume of energy derivatives, which represent both purchases and sales (does not reflect net position):
|  |  |  | Quantity
Commodity |  | Unit of Measure |  | September 30, 2025 |  | December 31, 2024
Power |  | Gigawatt-hour |  | 619 |  |  | 1,051 |
Gas |  | Billion cubic feet |  | 241 |  |  | 235 |
Schedule of Gains and Losses from Derivative Instruments Not Designated as Accounting Hedges Instruments | The following table provides information about gains and losses from energy derivative instruments not designated as accounting hedging instruments (dollars in thousands):
|  |  | Financial Statement |  | Three Months Ended September 30, |  | Nine Months Ended September 30, |  |
Commodity Contracts |  |  | Location |  | 2025 |  | 2024 |  | 2025 |  | 2024 |  |  |  |  |  |
Net Loss Recognized in Income |  |  | Fuel and purchased power (a) |  | $ | (67,368) |  |  | $ | (59,485) |  |  | $ | (26,598) |  |  | $ | (118,179) |  |  |  |  |  |  |
(a)Amounts are before the effect of PSA deferrals.
Schedule of the Entity's Fair Value of Risk Management Activities Reported on a Gross Basis and the Impacts on Offsetting Liabilities | The following tables provide information about the fair value of APS’s risk management activities reported on a gross basis and the impacts of offsetting. These amounts relate to commodity contracts and are located in the assets and liabilities from risk management activities lines of APS’s Condensed Consolidated Balance Sheets.
As of September 30, 2025: (dollars in thousands) |  | Gross Recognized Derivatives (a) |  | Amounts Offset (b) |  | Net Recognized Derivatives |  | Other (c) |  | Amounts Reported on Balance Sheets
Current assets |  | $ | 17,605 |  |  | $ | (10,974) |  |  | $ | 6,631 |  |  | $ | 5 |  |  | $ | 6,636 |
Investments and other assets |  | 16,207 |  |  | (607) |  |  | 15,600 |  |  | — |  |  | 15,600 |
Total assets |  | 33,812 |  |  | (11,581) |  |  | 22,231 |  |  | 5 |  |  | 22,236 |
Current liabilities |  | (44,256) |  |  | 10,974 |  |  | (33,282) |  |  | (5,796) |  |  | (39,078) |
Deferred credits and other |  | (607) |  |  | 607 |  |  | — |  |  | — |  |  | — |
Total liabilities |  | (44,863) |  |  | 11,581 |  |  | (33,282) |  |  | (5,796) |  |  | (39,078) |
Total |  | $ | (11,051) |  |  | $ | — |  |  | $ | (11,051) |  |  | $ | (5,791) |  |  | $ | (16,842) |
(a)All of our gross recognized derivative instruments were subject to master netting arrangements. (b)No cash collateral has been provided to counterparties, or received from counterparties, that is subject to offsetting. (c)Represents cash collateral and cash margin that is not subject to offsetting. Amounts relate to non-derivative instruments, derivatives qualifying for scope exceptions, or collateral and margin posted in excess of the recognized derivative instrument. Includes cash collateral received from counterparties of $5,796 thousand and cash margin provided to counterparties of $5 thousand.
As of December 31, 2024: (dollars in thousands) |  | Gross Recognized Derivatives (a) |  | Amounts Offset (b) |  | Net Recognized Derivatives |  | Other (c) |  | Amounts Reported on Balance Sheets
Current assets |  | $ | 13,718 |  |  | $ | (3,158) |  |  | $ | 10,560 |  |  | $ | 18 |  |  | $ | 10,578 |
Investments and other assets |  | 6,610 |  |  | (630) |  |  | 5,980 |  |  | — |  |  | 5,980 |
Total assets |  | 20,328 |  |  | (3,788) |  |  | 16,540 |  |  | 18 |  |  | 16,558 |
Current liabilities |  | (52,527) |  |  | 3,158 |  |  | (49,369) |  |  | (2,971) |  |  | (52,340) |
Deferred credits and other |  | (10,076) |  |  | 630 |  |  | (9,446) |  |  | — |  |  | (9,446) |
Total liabilities |  | (62,603) |  |  | 3,788 |  |  | (58,815) |  |  | (2,971) |  |  | (61,786) |
Total |  | $ | (42,275) |  |  | $ | — |  |  | $ | (42,275) |  |  | $ | (2,953) |  |  | $ | (45,228) |
(a)All of our gross recognized derivative instruments were subject to master netting arrangements. (b)No cash collateral has been provided to counterparties, or received from counterparties, that is subject to offsetting. (c)Represents cash collateral and cash margin that is not subject to offsetting. Amounts relate to non-derivative instruments, derivatives qualifying for scope exceptions, or collateral and margin posted in excess of the recognized derivative instrument. Includes cash collateral received from counterparties of $2,971 thousand and cash margin provided to counterparties of $18 thousand.
Schedule of the Entity's Fair Value of Risk Management Activities Reported on a Gross Basis and the Impacts on Offsetting Assets | The following tables provide information about the fair value of APS’s risk management activities reported on a gross basis and the impacts of offsetting. These amounts relate to commodity contracts and are located in the assets and liabilities from risk management activities lines of APS’s Condensed Consolidated Balance Sheets.
As of September 30, 2025: (dollars in thousands) |  | Gross Recognized Derivatives (a) |  | Amounts Offset (b) |  | Net Recognized Derivatives |  | Other (c) |  | Amounts Reported on Balance Sheets
Current assets |  | $ | 17,605 |  |  | $ | (10,974) |  |  | $ | 6,631 |  |  | $ | 5 |  |  | $ | 6,636 |
Investments and other assets |  | 16,207 |  |  | (607) |  |  | 15,600 |  |  | — |  |  | 15,600 |
Total assets |  | 33,812 |  |  | (11,581) |  |  | 22,231 |  |  | 5 |  |  | 22,236 |
Current liabilities |  | (44,256) |  |  | 10,974 |  |  | (33,282) |  |  | (5,796) |  |  | (39,078) |
Deferred credits and other |  | (607) |  |  | 607 |  |  | — |  |  | — |  |  | — |
Total liabilities |  | (44,863) |  |  | 11,581 |  |  | (33,282) |  |  | (5,796) |  |  | (39,078) |
Total |  | $ | (11,051) |  |  | $ | — |  |  | $ | (11,051) |  |  | $ | (5,791) |  |  | $ | (16,842) |
(a)All of our gross recognized derivative instruments were subject to master netting arrangements. (b)No cash collateral has been provided to counterparties, or received from counterparties, that is subject to offsetting. (c)Represents cash collateral and cash margin that is not subject to offsetting. Amounts relate to non-derivative instruments, derivatives qualifying for scope exceptions, or collateral and margin posted in excess of the recognized derivative instrument. Includes cash collateral received from counterparties of $5,796 thousand and cash margin provided to counterparties of $5 thousand.
As of December 31, 2024: (dollars in thousands) |  | Gross Recognized Derivatives (a) |  | Amounts Offset (b) |  | Net Recognized Derivatives |  | Other (c) |  | Amounts Reported on Balance Sheets
Current assets |  | $ | 13,718 |  |  | $ | (3,158) |  |  | $ | 10,560 |  |  | $ | 18 |  |  | $ | 10,578 |
Investments and other assets |  | 6,610 |  |  | (630) |  |  | 5,980 |  |  | — |  |  | 5,980 |
Total assets |  | 20,328 |  |  | (3,788) |  |  | 16,540 |  |  | 18 |  |  | 16,558 |
Current liabilities |  | (52,527) |  |  | 3,158 |  |  | (49,369) |  |  | (2,971) |  |  | (52,340) |
Deferred credits and other |  | (10,076) |  |  | 630 |  |  | (9,446) |  |  | — |  |  | (9,446) |
Total liabilities |  | (62,603) |  |  | 3,788 |  |  | (58,815) |  |  | (2,971) |  |  | (61,786) |
Total |  | $ | (42,275) |  |  | $ | — |  |  | $ | (42,275) |  |  | $ | (2,953) |  |  | $ | (45,228) |
(a)All of our gross recognized derivative instruments were subject to master netting arrangements. (b)No cash collateral has been provided to counterparties, or received from counterparties, that is subject to offsetting. (c)Represents cash collateral and cash margin that is not subject to offsetting. Amounts relate to non-derivative instruments, derivatives qualifying for scope exceptions, or collateral and margin posted in excess of the recognized derivative instrument. Includes cash collateral received from counterparties of $2,971 thousand and cash margin provided to counterparties of $18 thousand.
Schedule of Information about Derivative Instruments that have Credit-Risk-Related Contingent Features | The following table provides information about our energy derivative instruments that have credit-risk-related contingent features (dollars in thousands):
| September 30, 2025
Aggregate fair value of derivative instruments in a net liability position | $ | 44,863 |
Additional collateral in the event credit-risk related contingent features were fully triggered (a) | 10,007 |
(a)This amount is after counterparty netting and includes those contracts which qualify for scope exceptions, which are excluded from the derivative details above.

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