v3.25.1
Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Revenue from External Customer [Line Items]      
Operating Revenues $ 1,032,280 $ 951,712  
Fuel and purchased power 380,071 357,864  
Operations and maintenance 300,109 257,578  
Depreciation and amortization 234,940 210,294  
Taxes other than income taxes 59,354 59,164  
Pension and other postretirement non-service credits, net 2,958 11,568  
Allowance for equity funds used during construction 13,249 10,292  
Interest expense and costs 94,841 86,633  
Income taxes (benefit) (6,183) 3,891  
Less: Net income attributable to noncontrolling interests (Note 8) 4,306 4,306  
Net Income (Loss) Attributable to Common Shareholders (4,644) 16,862  
TOTAL ASSETS 27,236,478   $ 26,102,760
Reportable Segment | Pinnacle West      
Revenue from External Customer [Line Items]      
Operating Revenues 1,032,000 952,000  
Fuel and purchased power (380,000) (358,000)  
Operations and maintenance (300,000) (258,000)  
Depreciation and amortization (235,000) (210,000)  
Taxes other than income taxes (59,000) (59,000)  
Pension and other postretirement non-service credits, net 3,000 12,000  
Allowance for equity funds used during construction 13,000 10,000  
Other income and expenses, net 14,000 23,000  
Interest expense and costs (95,000) (87,000)  
Income taxes (benefit) 6,000 (4,000)  
Less: Net income attributable to noncontrolling interests (Note 8) (4,000) (4,000)  
Net Income (Loss) Attributable to Common Shareholders (5,000) 17,000  
TOTAL ASSETS 27,236,000   26,103,000
Regulated Electricity Segment      
Revenue from External Customer [Line Items]      
Operating Revenues 1,032,000 952,000  
Fuel and purchased power (380,000) (358,000)  
Operations and maintenance (297,000) (254,000)  
Depreciation and amortization (235,000) (210,000)  
Taxes other than income taxes (59,000) (59,000)  
Pension and other postretirement non-service credits, net 3,000 12,000  
Allowance for equity funds used during construction 13,000 10,000  
Other income and expenses, net 3,000 4,000  
Interest expense and costs (79,000) (74,000)  
Income taxes (benefit) 3,000 (4,000)  
Less: Net income attributable to noncontrolling interests (Note 8) (4,000) (4,000)  
Net Income (Loss) Attributable to Common Shareholders 0 15,000  
TOTAL ASSETS 27,097,000   25,988,000
Other      
Revenue from External Customer [Line Items]      
Operating Revenues 0 0  
Fuel and purchased power 0 0  
Operations and maintenance (3,000) (4,000)  
Depreciation and amortization 0 0  
Taxes other than income taxes 0 0  
Pension and other postretirement non-service credits, net 0 0  
Allowance for equity funds used during construction 0 0  
Other income and expenses, net 11,000 19,000  
Interest expense and costs (16,000) (13,000)  
Income taxes (benefit) 3,000 0  
Less: Net income attributable to noncontrolling interests (Note 8) 0 0  
Net Income (Loss) Attributable to Common Shareholders (5,000) $ 2,000  
TOTAL ASSETS $ 139,000   $ 115,000