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Changes in Accumulated Other Comprehensive Loss | 6 Months Ended
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Jun. 30, 2026
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Changes in Accumulated Other Comprehensive Loss | Changes in Accumulated Other Comprehensive Loss 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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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/220/tableOfContent + Details
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