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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Income Statement [Abstract]    
OPERATING REVENUES (Note 2) $ 951,712 $ 944,955 CloseClose
OPERATING EXPENSES     CloseClose
Fuel and purchased power 357,864 394,504 CloseClose
Operations and maintenance 257,578 250,080 CloseClose
Depreciation and amortization 210,294 191,906 CloseClose
Taxes other than income taxes 59,164 57,138 CloseClose
Other expense 20 610 CloseClose
Total 884,920 894,238
OPERATING INCOME 66,792 50,717 CloseCloseCloseClose
Total Operating Expenses 884920.0 894238.0 0.0 0 0 Close
Total Operating Expenses 884920.0 894238.0 0 0 0 Close Close
OTHER INCOME (DEDUCTIONS)     CloseClose
Allowance for equity funds used during construction 10,292 15,061 CloseClose
Pension and other postretirement non-service credits - net (Note 5) 11,568 9,865 CloseClose
Other income (Note 9) 30,607 6,077 CloseClose
Other expense (Note 9) (7,567) (4,131) CloseClose
Total 44,900 26,872 CloseClose
INTEREST EXPENSE     CloseClose
Interest charges 99,774 88,119 CloseClose
Total Other Income Expenses 1061353.0 1023379.0 0.0 0.0 0.0 Close
Allowance for borrowed funds used during construction (13,141) (12,722) CloseCloseClose
Total Other Income Expenses 263066.0 204538.0 0 0 0 Close Close
Total 86,633 75,397 CloseCloseClose
Income Before Income Taxes 25,059 2,192 CloseClose
Income Taxes 3,891 1,183 Close
Net Income 21,168 1,009 Close
Less: Net income attributable to noncontrolling interests (Note 6) 4,306 4,306
Net Income (Loss) Attributable to Common Shareholders $ 16,862 $ (3,297)
Weighted-average common shares outstanding - basic (in shares) 113,621 113,358
Weighted-average common shares outstanding - diluted (in shares) 114,227 113,358
Earnings Per Weighted-Average Common Share Outstanding    
Net income (loss) attributable to common shareholders - basic (in dollars per share) $ 0.15 $ (0.03)
Net income (loss) attributable to common shareholders - diluted (in dollars per share) $ 0.15 $ (0.03)