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Changes in Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2022
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, 2020 | $ | (60,725) |  |  |  |  | $ | (2,071) |  |  |  |  | $ | (62,796) |
OCI (loss) before reclassifications | 2,439 |  |  |  |  | 1,077 |  |  |  |  | 3,516 |
Amounts reclassified from accumulated other comprehensive loss | 4,401 |  |  | (a) |  | 18 |  |  | (b) |  | 4,419 |
Balance at December 31, 2021 | (53,885) |  |  |  |  | (976) |  |  |  |  | (54,861) |
OCI (loss) before reclassifications | 17,550 |  |  |  |  | 1,873 |  |  |  |  | 19,423 |
Amounts reclassified from accumulated other comprehensive loss | 4,003 |  |  | (a) |  | — |  |  |  |  | 4,003 |
Balance at December 31, 2022 | $ | (32,332) |  |  |  |  | $ | 897 |  |  |  |  | $ | (31,435) |
(a)These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost. See Note 7. (b)These amounts represent realized gains and losses and are included in the computation of fuel and purchased power costs and are subject to the PSA. See Note 15. 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 |  |  |  | Derivative Instruments |  |  |  | Total
Balance at December 31, 2020 | $ | (40,918) |  |  |  |  | $ | — |  |  |  |  | $ | (40,918) |
OCI (loss) before reclassifications | 2,043 |  |  |  |  | (18) |  |  |  |  | 2,025 |
Amounts reclassified from accumulated other comprehensive loss | 3,995 |  |  | (a) |  | 18 |  |  | (b) |  | 4,013 |
Balance at December 31, 2021 | (34,880) |  |  |  |  | — |  |  |  |  | (34,880) |
OCI (loss) before reclassifications | 15,646 |  |  |  |  | — |  |  |  |  | 15,646 |
Amounts reclassified from accumulated other comprehensive loss | 3,638 |  |  | (a) |  | — |  |  |  |  | 3,638 |
Balance at December 31, 2022 | $ | (15,596) |  |  |  |  | $ | — |  |  |  |  | $ | (15,596) |
(a)These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost. See Note 7. (b)These amounts represent realized gains and losses and are included in the computation of fuel and purchased power costs and are subject to the PSA. See Note 15.

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