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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Statement [Abstract]      
Operating Revenues $ 1,875,448 $ 1,808,082 $ 1,592,586
Operating Expenses      
Fuel 372,692 504,757 399,914
Purchased Power 221,781 209,790 204,264
Transmission and Other PPFAC Recoverable Costs 81,706 84,323 65,583
Increase (Decrease) to Reflect PPFAC Recovery Treatment 80,207 (27,643) (64,155)
Total Fuel and Purchased Power 756,386 771,227 605,606
Operations and Maintenance 444,826 405,438 397,095
Depreciation 198,919 211,008 201,524
Amortization 36,876 40,045 43,995
Taxes Other Than Income Taxes 67,484 63,706 62,010
Total Operating Expenses 1,504,491 1,491,424 1,310,230
Operating Income 370,957 316,658 282,356
Other Income (Expense)      
Interest Expense (95,389) (85,217) (86,865)
Allowance For Borrowed Funds 5,145 2,756 6,624
Allowance For Equity Funds 14,763 8,170 17,885
Unrealized Gains (Losses) on Investments 2,992 (7,094) 3,898
Other, Net 9,415 14,414 9,823
Total Other Income (Expense) (63,074) (66,971) (48,635)
Income Before Income Tax Expense 307,883 249,687 233,721
Income Tax Expense 49,229 32,262 32,476
Net Income $ 258,654 $ 217,425 $ 201,245