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Changes in Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2026
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) Including Reclassification Adjustments, by Component | The following tables show the changes in Pinnacle West’s consolidated accumulated other comprehensive income (loss), including reclassification adjustments, net of tax, by component (dollars in thousands):
| Pension and Other Postretirement Benefits |  |  |  | Derivative Instruments |  |  |  | Total
Three Months Ended June 30 |  |  |  |  |  |  |  |  |
Balance March 31, 2026 | $ | (32,478) |  |  |  |  | $ | 529 |  |  |  |  | $ | (31,949) |
Other comprehensive income before reclassifications | 404 |  |  |  |  | 18 |  |  |  |  | 422 |
Amounts reclassified from accumulated other comprehensive loss | 493 |  |  | (a) |  | — |  |  |  |  | 493 |
Balance June 30, 2026 | $ | (31,581) |  |  |  |  | $ | 547 |  |  |  |  | $ | (31,034) |
Balance March 31, 2025 | $ | (31,163) |  |  |  |  | $ | 1,069 |  |  |  |  | $ | (30,094) |
Other comprehensive loss before reclassifications | (503) |  |  |  |  | (294) |  |  |  |  | (797) |
Amounts reclassified from accumulated other comprehensive loss | 450 |  |  | (a) |  | — |  |  |  |  | 450 |
Balance June 30, 2025 | $ | (31,216) |  |  |  |  | $ | 775 |  |  |  |  | $ | (30,441) |
(a) These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost. See Note 8.
| Pension and Other Postretirement Benefits |  |  |  | Derivative Instruments |  |  |  | Total
Six Months Ended June 30 |  |  |  |  |  |  |  |  |
Balance December 31, 2025 | $ | (32,980) |  |  |  |  | $ | 572 |  |  |  |  | $ | (32,408) |
Other comprehensive income/(loss) before reclassifications | 404 |  |  |  |  | (25) |  |  |  |  | 379 |
Amounts reclassified from accumulated other comprehensive loss | 995 |  |  | (a) |  | — |  |  |  |  | 995 |
Balance June 30, 2026 | $ | (31,581) |  |  |  |  | $ | 547 |  |  |  |  | $ | (31,034) |
Balance December 31, 2024 | $ | (31,661) |  |  |  |  | $ | 719 |  |  |  |  | $ | (30,942) |
Other comprehensive income/(loss) before reclassifications | (503) |  |  |  |  | 56 |  |  |  |  | (447) |
Amounts reclassified from accumulated other comprehensive loss | 948 |  |  | (a) |  | — |  |  |  |  | 948 |
Balance June 30, 2025 | $ | (31,216) |  |  |  |  | $ | 775 |  |  |  |  | $ | (30,441) |
(a) These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost. See Note 8. The following tables show the changes in APS’s accumulated other comprehensive loss, including reclassification adjustments, net of tax, by component (dollars in thousands):
| Pension and Other Postretirement Benefits |  |  |  |  |  |  |  |
Three Months Ended June 30 |  |  |  |  |  |  |  |  |
Balance March 31, 2026 | $ | (15,047) |  |  |  |  |  |  |  |  |
Other comprehensive income before reclassifications | 454 |  |  |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 406 |  |  | (a) |  |  |  |  |  |
Balance June 30, 2026 | $ | (14,187) |  |  |  |  |  |  |  |  |
Balance March 31, 2025 | $ | (13,710) |  |  |  |  |  |  |  |  |
Other comprehensive loss before reclassifications | (504) |  |  |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 368 |  |  | (a) |  |  |  |  |  |
Balance June 30, 2025 | $ | (13,846) |  |  |  |  |  |  |  |  |
(a) These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost. See Note 8.
| Pension and Other Postretirement Benefits |  |  |  |  |  |  |  |
Six Months Ended June 30 |  |  |  |  |  |  |  |  |
Balance December 31, 2025 | $ | (15,457) |  |  |  |  |  |  |  |  |
Other comprehensive income before reclassifications | 454 |  |  |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 816 |  |  | (a) |  |  |  |  |  |
Balance June 30, 2026 | $ | (14,187) |  |  |  |  |  |  |  |  |
Balance December 31, 2024 | $ | (14,116) |  |  |  |  |  |  |  |  |
Other comprehensive loss before reclassifications | (504) |  |  |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 774 |  |  | (a) |  |  |  |  |  |
Balance June 30, 2025 | $ | (13,846) |  |  |  |  |  |  |  |  |
(a) These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost. See Note 8.

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