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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
OPERATING REVENUES (NOTE 2) | $ 696,475 | $ 661,930
OPERATING EXPENSES |  |
Fuel and purchased power | 198,227 | 188,521
Operations and maintenance | 230,055 | 221,318
Depreciation and amortization | 157,820 | 154,079
Taxes other than income taxes | 59,483 | 56,768
Other expenses | 3,356 | 822
Total | 648,941 | 621,508
OPERATING INCOME | 47,534 | 40,422
OTHER INCOME (DEDUCTIONS) |  |
Allowance for equity funds used during construction | 9,207 | 7,697
Pension and other postretirement non-service credits — net | 27,791 | 13,911
Other income (Note 9) | 12,429 | 12,569
Other expense (Note 9) | (3,853) | (4,784)
Total | 45,574 | 29,393
INTEREST EXPENSE |  |
Interest charges | 61,938 | 59,234
Allowance for borrowed funds used during construction | (4,994) | (4,076)
Total | 56,944 | 55,158
INCOME BEFORE INCOME TAXES | 36,164 | 14,657
INCOME TAXES | (4,350) | (20,209)
NET INCOME | 40,514 | 34,866
Less: Comprehensive income attributable to noncontrolling interests | 4,873 | 4,873
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS | $ 35,641 | $ 29,993
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING |  |
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING - BASIC (in shares) | 112,829 | 112,594
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING - DILUTED (in shares) | 113,093 | 112,862
EARNINGS PER WEIGHTED-AVERAGE COMMON SHARE OUTSTANDING |  |
Net income attributable to common shareholders - basic (in dollars per share) | $ 0.32 | $ 0.27
Net income attributable to common shareholders - diluted (in dollars per share) | $ 0.32 | $ 0.27
APS |  |
OPERATING REVENUES (NOTE 2) | $ 696,475 | $ 661,930
OPERATING EXPENSES |  |
Fuel and purchased power | 198,227 | 188,521
Operations and maintenance | 226,401 | 218,265
Depreciation and amortization | 157,800 | 154,058
Taxes other than income taxes | 59,472 | 56,758
Other expenses | 3,356 | 822
Total | 645,256 | 618,424
OPERATING INCOME | 51,219 | 43,506
OTHER INCOME (DEDUCTIONS) |  |
Allowance for equity funds used during construction | 9,207 | 7,697
Pension and other postretirement non-service credits — net | 27,837 | 14,262
Other income (Note 9) | 11,960 | 11,633
Other expense (Note 9) | (3,350) | (4,668)
Total | 45,654 | 28,924
INTEREST EXPENSE |  |
Interest charges | 59,388 | 55,736
Allowance for borrowed funds used during construction | (4,994) | (4,076)
Total | 54,394 | 51,660
INCOME BEFORE INCOME TAXES | 42,479 | 20,770
INCOME TAXES | 2,319 | (19,448)
NET INCOME | 40,160 | 40,218
Less: Comprehensive income attributable to noncontrolling interests | 4,873 | 4,873
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS | $ 35,287 | $ 35,345

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