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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2024
Accounting Policies [Abstract]  
Schedule of Property, Plant and Equipment
Pinnacle West’s property, plant and equipment included in the December 31, 2024, and 2023 Consolidated Balance Sheets is composed of the following (dollars in thousands):

Property, Plant and Equipment:20242023
Generation$11,111,915 $10,446,291 
Transmission4,135,970 3,773,253 
Distribution9,016,843 8,448,293 
General plant1,596,222 1,543,330 
Plant in service and held for future use25,860,950 24,211,167 
Accumulated depreciation and amortization(9,027,426)(8,408,040)
Net16,833,524 15,803,127 
Construction work in progress1,592,659 1,724,004 
Palo Verde sale leaseback, net of accumulated depreciation82,556 86,426 
Intangible assets, net of accumulated amortization591,310 267,110 
Nuclear fuel, net of accumulated amortization97,850 99,490 
Total property, plant and equipment$19,197,899 $17,980,157 
Schedule of Supplemental Cash Flow Information
The following table summarizes supplemental Pinnacle West cash flow information for each of the last three years (dollars in thousands):
Year Ended December 31,
202420232022
Cash paid during the period for:
Income taxes, net of refunds$133,968 $8,788 $46,227 
Interest, net of amounts capitalized360,349 310,996 245,271 
Significant non-cash investing and financing activities:
Accrued capital expenditures$257,494 $206,269 $114,999 
Dividends accrued but not yet paid106,592 99,813 97,895 
BCE Sale non-cash consideration (Note 20)
— 28,262 — 

The following table summarizes supplemental APS cash flow information for each of the last three years (dollars in thousands):
Year Ended December 31,
202420232022
Cash paid during the period for:
Income taxes, net of refunds$179,013 $21,734 $95,985 
Interest, net of amounts capitalized299,799 267,261 227,159 
Significant non-cash investing and financing activities:
Accrued capital expenditures$257,494 $206,269 $116,533 
Dividends accrued but not yet paid107,200 99,800 97,900 
Schedule Of Reportable Segment’s Revenues, Significant Expenses, Net Income, And Assets The following tables reconcile our reportable segment’s revenues, significant expenses, net income, and assets to the Pinnacle West Consolidated amounts (dollars in millions):
Year Ended December 31,
202420232022
Regulated Electricity SegmentOther Pinnacle West ConsolidatedRegulated Electricity SegmentOther Pinnacle West ConsolidatedRegulated Electricity SegmentOther Pinnacle West Consolidated
Operating Revenues$5,125 $— $5,125 $4,696 $— $4,696 $4,324 $— $4,324 
Fuel & Purchase Power (1,823)— (1,823)(1,793)— (1,793)(1,629)— (1,629)
Operations & Maintenance(1,159)(6)(1,165)(1,044)(15)(1,059)(974)(13)(987)
Depreciation & Amortization (895)— (895)(794)— (794)(753)— (753)
Taxes other than income taxes (227)— (227)(224)— (224)(220)— (220)
Pension and other postretirement non-service credits, net49 — 49 42 (1)41 99 (1)98 
Other income and expenses, net (a)28 22 50 60 — 60 22 (23)(1)
Interest expense and costs(312)(65)(377)(285)(46)(331)(236)(20)(256)
Income Taxes(127)16 (111)(94)17 (77)(91)16 (75)
Less: income related to noncontrolling interest(17)— (17)(17)— (17)(17)— (17)
Net Income (loss) $642 $(33)$609 $547 $(45)$502 $525 $(41)$484 
(a) See Note 16 for additional details regarding other income and other expenses. Other income includes allowance for equity funds used during construction, see the APS Consolidated Income Statements.

December 31, 2024December 31, 2023
Regulated Electricity SegmentOtherPNW ConsolidatedRegulated Electricity SegmentOtherPNW Consolidated
Total Assets$25,988 $115 $26,103 $24,516 $145 $24,661