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Changes in Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2024
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Loss Including Reclassification Adjustments, by Component | The following table shows the changes in Pinnacle West’s consolidated accumulated other comprehensive loss, including reclassification adjustments, net of tax, by component (dollars in thousands):
| Pension and Other Postretirement Benefits |  |  |  | Derivative Instruments |  | Total
Balance at December 31, 2022 | $ | (32,332) |  |  |  |  | $ | 897 |  |  | $ | (31,435) |
Other comprehensive income/(loss) before reclassifications | (4,420) |  |  |  |  | 713 |  |  | (3,707) |
Amounts reclassified from accumulated other comprehensive loss | 1,998 |  |  | (a) |  | — |  |  | 1,998 |
Balance at December 31, 2023 | (34,754) |  |  |  |  | 1,610 |  |  | (33,144) |
Other comprehensive income/(loss) before reclassifications | 1,039 |  |  |  |  | (891) |  |  | 148 |
Amounts reclassified from accumulated other comprehensive loss | 2,054 |  |  | (a) |  | — |  |  | 2,054 |
Balance at December 31, 2024 | $ | (31,661) |  |  |  |  | $ | 719 |  |  | $ | (30,942) |
(a)These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost. See Note 7. The following table shows the changes in APS’s consolidated accumulated other comprehensive loss, including reclassification adjustments, net of tax, by component (dollars in thousands):
| Pension and Other Postretirement Benefits |  |  |  |  |  |
Balance at December 31, 2022 | $ | (15,596) |  |  |  |  |  |  |
Other comprehensive (loss) before reclassifications | (3,383) |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 1,760 |  |  | (a) |  |  |  |
Balance at December 31, 2023 | (17,219) |  |  |  |  |  |  |
Other comprehensive income before reclassifications | 1,255 |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 1,848 |  |  | (a) |  |  |  |
Balance at December 31, 2024 | $ | (14,116) |  |  |  |  |  |  |
(a)These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost. See Note 7.

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