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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Statement [Abstract] |  |  |
OPERATING REVENUES (Note 2) | $ 4,695,991 | $ 4,324,385 | $ 3,803,835
OPERATING EXPENSES |  |  |
Fuel and purchased power | 1,792,657 | 1,629,343 | 1,152,551
Operations and maintenance | 1,058,725 | 987,072 | 954,067
Depreciation and amortization | 794,043 | 753,195 | 650,875
Taxes other than income taxes | 224,013 | 220,370 | 234,639
Other expenses | 1,913 | 2,494 | 6,393
Total | 3,871,351 | 3,592,474 | 2,998,525
OPERATING INCOME | 824,640 | 731,911 | 805,310
OTHER INCOME (DEDUCTIONS) |  |  |
Allowance for equity funds used during construction (Note 1) | 53,118 | 45,263 | 41,737
Pension and other postretirement non-service credits, net (Note 7) | 40,648 | 98,487 | 112,541
Other income (Note 16) | 33,666 | 7,916 | 45,100
Other expense (Note 16) | (25,056) | (52,385) | (25,396)
Total | 102,376 | 99,281 | 173,982
INTEREST EXPENSE |  |  |
Interest charges | 374,887 | 283,569 | 254,314
Allowance for borrowed funds used during construction (Note 1) | (43,564) | (28,030) | (21,052)
Total | 331,323 | 255,539 | 233,262
INCOME BEFORE INCOME TAXES | 595,693 | 575,653 | 746,030
INCOME TAXES (Note 4) | 76,912 | 74,827 | 110,086
NET INCOME | 518,781 | 500,826 | 635,944
Less: Net income attributable to noncontrolling interests (Note 17) | 17,224 | 17,224 | 17,224
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS | $ 501,557 | $ 483,602 | $ 618,720
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING — BASIC (in shares) | 113,442 | 113,196 | 112,910
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING — DILUTED (in shares) | 113,804 | 113,416 | 113,192
EARNINGS PER WEIGHTED-AVERAGE COMMON SHARE OUTSTANDING |  |  |
Net income attributable to common shareholders - basic (in dollars per share) | $ 4.42 | $ 4.27 | $ 5.48
Net income attributable to common shareholders — diluted (in dollars per share) | $ 4.41 | $ 4.26 | $ 5.47

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