CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
OPERATING REVENUES (Note 2)	$ 783,531	$ 696,475
OPERATING EXPENSES
Fuel and purchased power	265,269	198,227
Operations and maintenance	218,342	230,055
Depreciation and amortization	186,605	157,820
Taxes other than income taxes	57,998	59,483
Other expenses	825	3,356
Total	729,039	648,941
OPERATING INCOME	54,492	47,534
OTHER INCOME (DEDUCTIONS)
Allowance for equity funds used during construction	9,747	9,207
Pension and other postretirement non-service credits - net	23,809	27,791
Other income (Note 9)	1,704	12,429
Other expense (Note 9)	(3,422)	(3,853)
Total	31,838	45,574
INTEREST EXPENSE
Interest charges	65,389	61,938
Allowance for borrowed funds used during construction	(4,482)	(4,994)
Total	60,907	56,944
INCOME BEFORE INCOME TAXES	25,423	36,164
INCOME TAXES	4,161	(4,350)
NET INCOME	21,262	40,514
Less: Comprehensive income attributable to noncontrolling interests	4,306	4,873
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	16,956	35,641
APS
OPERATING REVENUES (Note 2)	783,531	696,475
OPERATING EXPENSES
Fuel and purchased power	265,269	198,227
Operations and maintenance	214,601	226,401
Depreciation and amortization	186,583	157,800
Taxes other than income taxes	57,959	59,472
Other expenses	825	3,356
Total	725,237	645,256
OPERATING INCOME	58,294	51,219
OTHER INCOME (DEDUCTIONS)
Allowance for equity funds used during construction	9,747	9,207
Pension and other postretirement non-service credits - net	23,907	27,837
Other income (Note 9)	1,152	11,960
Other expense (Note 9)	(1,849)	(3,350)
Total	32,957	45,654
INTEREST EXPENSE
Interest charges	62,309	59,388
Allowance for borrowed funds used during construction	(4,422)	(4,994)
Total	57,887	54,394
INCOME BEFORE INCOME TAXES	33,364	42,479
INCOME TAXES	4,859	2,319
NET INCOME	28,505	40,160
Less: Comprehensive income attributable to noncontrolling interests	4,306	4,873
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 24,199	$ 35,287