CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
OPERATING REVENUES (Note 2)	$ 3,803,835	$ 3,586,982	$ 3,471,209
OPERATING EXPENSES
Fuel and purchased power	1,152,551	993,419	1,042,237
Operations and maintenance	954,067	958,910	941,616
Depreciation and amortization	650,875	614,378	590,929
Taxes other than income taxes	234,639	224,835	218,579
Other expenses	6,393	7,288	5,888
Total	2,998,525	2,798,830	2,799,249
OPERATING INCOME	805,310	788,152	671,960
OTHER INCOME (DEDUCTIONS)
Allowance for equity funds used during construction (Note 1)	41,737	33,776	31,431
Pension and other postretirement non-service credits — net (Note 8)	112,541	56,341	22,989
Other income (Note 17)	45,100	56,703	50,263
Other expense (Note 17)	(25,396)	(57,776)	(17,880)
Total	173,982	89,044	86,803
INTEREST EXPENSE
Interest charges	254,314	247,501	235,251
Allowance for borrowed funds used during construction (Note 1)	(21,052)	(18,530)	(18,528)
Total	233,262	228,971	216,723
INCOME BEFORE INCOME TAXES	746,030	648,225	542,040
INCOME TAXES (Note 5)	110,086	78,173	(15,773)
NET INCOME	635,944	570,052	557,813
Less: Net income attributable to noncontrolling interests (Note 18)	17,224	19,493	19,493
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	618,720	550,559	538,320
Arizona Public Service Company
OPERATING REVENUES (Note 2)	3,803,835	3,586,982	3,471,209
OPERATING EXPENSES
Fuel and purchased power	1,152,551	993,419	1,042,237
Operations and maintenance	940,588	945,181	926,716
Depreciation and amortization	650,773	614,293	590,844
Taxes other than income taxes	234,569	224,790	218,540
Other expenses	6,393	7,288	5,888
Total	2,984,874	2,784,971	2,784,225
OPERATING INCOME	818,961	802,011	686,984
OTHER INCOME (DEDUCTIONS)
Allowance for equity funds used during construction (Note 1)	41,737	33,776	31,431
Pension and other postretirement non-service credits — net (Note 8)	112,742	57,359	24,529
Other income (Note 17)	43,053	51,755	46,884
Other expense (Note 17)	(18,897)	(53,694)	(12,990)
Total	178,635	89,196	89,854
INTEREST EXPENSE
Interest charges	243,592	233,452	220,174
Allowance for borrowed funds used during construction (Note 1)	(21,052)	(18,530)	(18,528)
Total	222,540	214,922	201,646
INCOME BEFORE INCOME TAXES	775,056	676,285	575,192
INCOME TAXES (Note 5)	125,553	88,764	(9,572)
NET INCOME	649,503	587,521	584,764
Less: Net income attributable to noncontrolling interests (Note 18)	17,224	19,493	19,493
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 632,279	$ 568,028	$ 565,271