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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Statement [Abstract] |  |  |
OPERATING REVENUES (Note 2) | $ 4,324,385 | $ 3,803,835 | $ 3,586,982
OPERATING EXPENSES |  |  |
Fuel and purchased power | 1,629,343 | 1,152,551 | 993,419
Operations and maintenance | 987,072 | 954,067 | 958,910
Depreciation and amortization | 753,195 | 650,875 | 614,378
Taxes other than income taxes | 220,370 | 234,639 | 224,835
Other expenses | 2,494 | 6,393 | 7,288
Total | 3,592,474 | 2,998,525 | 2,798,830
OPERATING INCOME | 731,911 | 805,310 | 788,152
OTHER INCOME (DEDUCTIONS) |  |  |
Allowance for equity funds used during construction (Note 1) | 45,263 | 41,737 | 33,776
Pension and other postretirement non-service credits — net (Note 7) | 98,487 | 112,541 | 56,341
Other income (Note 16) | 7,916 | 45,100 | 56,703
Other expense (Note 16) | (52,385) | (25,396) | (57,776)
Total | 99,281 | 173,982 | 89,044
INTEREST EXPENSE |  |  |
Interest charges | 283,569 | 254,314 | 247,501
Allowance for borrowed funds used during construction (Note 1) | (28,030) | (21,052) | (18,530)
Total | 255,539 | 233,262 | 228,971
INCOME BEFORE INCOME TAXES | 575,653 | 746,030 | 648,225
INCOME TAXES (Note 4) | 74,827 | 110,086 | 78,173
NET INCOME | 500,826 | 635,944 | 570,052
Less: Net income attributable to noncontrolling interests (Note 17) | 17,224 | 17,224 | 19,493
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS | $ 483,602 | $ 618,720 | $ 550,559
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING — BASIC (in shares) | 113,196 | 112,910 | 112,666
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING — DILUTED (in shares) | 113,416 | 113,192 | 112,942
EARNINGS PER WEIGHTED-AVERAGE COMMON SHARE OUTSTANDING |  |  |
Net income attributable to common shareholders - basic (in dollars per share) | $ 4.27 | $ 5.48 | $ 4.89
Net income attributable to common shareholders — diluted (in dollars per share) | $ 4.26 | $ 5.47 | $ 4.87

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