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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Statement [Abstract] |  |  |
OPERATING REVENUES (Note 2) | $ 5,124,915 | $ 4,695,991 | $ 4,324,385
OPERATING EXPENSES |  |  |
Fuel and purchased power | 1,822,566 | 1,792,657 | 1,629,343
Operations and maintenance | 1,165,156 | 1,058,725 | 987,072
Depreciation and amortization | 895,346 | 794,043 | 753,195
Taxes other than income taxes | 227,395 | 224,013 | 220,370
Other expense | 2,389 | 1,913 | 2,494
Total | 4,112,852 | 3,871,351 | 3,592,474
OPERATING INCOME | 1,012,063 | 824,640 | 731,911
OTHER INCOME (DEDUCTIONS) |  |  |
Allowance for equity funds used during construction (Note 1) | 38,620 | 53,118 | 45,263
Pension and other postretirement non-service credits, net (Note 7) | 48,870 | 40,648 | 98,487
Other income (Note 16) | 48,614 | 33,666 | 7,916
Other expense (Note 16) | (34,136) | (25,056) | (52,385)
Total | 101,968 | 102,376 | 99,281
INTEREST EXPENSE |  |  |
Interest charges | 425,742 | 374,887 | 283,569
Allowance for borrowed funds used during construction (Note 1) | (48,270) | (43,564) | (28,030)
Total | 377,472 | 331,323 | 255,539
INCOME BEFORE INCOME TAXES | 736,559 | 595,693 | 575,653
INCOME TAXES (Note 4) | 110,529 | 76,912 | 74,827
NET INCOME | 626,030 | 518,781 | 500,826
Less: Net income attributable to noncontrolling interests (Note 17) | 17,224 | 17,224 | 17,224
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS | $ 608,806 | $ 501,557 | $ 483,602
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING — BASIC (in shares) | 113,846 | 113,442 | 113,196
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING — DILUTED (in shares) | 116,232 | 113,804 | 113,416
EARNINGS PER WEIGHTED-AVERAGE COMMON SHARE OUTSTANDING |  |  |
Net income attributable to common shareholders — basic (in dollars per share) | $ 5.35 | $ 4.42 | $ 4.27
Net income attributable to common shareholders — diluted (in dollars per share) | $ 5.24 | $ 4.41 | $ 4.26

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