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CONSOLIDATED STATEMENTS OF INCOME (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Operating Revenues        
Total Operating Revenues $ 325,563 $ 338,033 $ 995,959 $ 1,027,437
Operating Expenses        
Electric Production Fuel 25,442 14,991 56,055 45,009
Electric Purchased Power 9,495 10,735 55,862 42,507
Electric Operating and Maintenance Expenses 41,144 43,737 136,830 136,367
Cost of Products Sold (excluding depreciation) 101,198 111,444 311,551 342,962
Nonelectric Selling, General, and Administrative Expenses 17,792 18,829 56,434 55,896
Depreciation and Amortization 29,554 27,051 88,376 79,579
Electric Property Taxes 4,333 3,705 12,788 11,691
Total Operating Expenses 228,958 230,492 717,896 714,011
Operating Income 96,605 107,541 278,063 313,426
Other Income and (Expense)        
Interest Expense (11,790) (11,173) (35,063) (31,225)
Nonservice Components of Postretirement Benefits 304 2,367 2,441 7,197
Other Income (Expense), net 5,990 5,421 15,231 14,491
Income Before Income Taxes 91,109 104,156 260,672 303,889
Income Tax Expense 12,817 18,677 36,553 57,077
Net Income $ 78,292 $ 85,479 $ 224,119 $ 246,812
Weighted-Average Common Shares Outstanding:        
Basic (in shares) 41,877 41,800 41,859 41,770
Diluted (in shares) 42,138 42,081 42,106 42,068
Earnings Per Share:        
Basic (in dollars per share) $ 1.87 $ 2.04 $ 5.35 $ 5.91
Diluted (in dollars per share) $ 1.86 $ 2.03 $ 5.32 $ 5.87
Electric        
Operating Revenues        
Total Operating Revenues $ 138,597 $ 130,380 $ 417,048 $ 384,696
Product Sales        
Operating Revenues        
Total Operating Revenues $ 186,966 $ 207,653 $ 578,911 $ 642,741