CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
OPERATING REVENUES (Note 2)	$ 1,061,669	$ 1,000,249	$ 1,845,200	$ 1,696,724
OPERATING EXPENSES
Fuel and purchased power	352,187	269,835	617,456	468,062
Operations and maintenance	245,387	229,690	463,729	459,745
Depreciation and amortization	186,497	158,750	373,102	316,570
Taxes other than income taxes	54,118	59,495	112,116	118,978
Other expenses	385	4,093	1,210	7,449
Total	838,574	721,863	1,567,613	1,370,804
OPERATING INCOME	223,095	278,386	277,587	325,920
OTHER INCOME (DEDUCTIONS)
Allowance for equity funds used during construction	12,086	9,990	21,833	19,197
Pension and other postretirement non-service credits - net (Note 5)	25,257	28,175	49,066	55,966
Other income (Note 9)	1,682	12,207	3,386	24,636
Other expense (Note 9)	(4,584)	(5,184)	(8,006)	(9,037)
Total	34,441	45,188	66,279	90,762
INTEREST EXPENSE
Interest charges	68,103	62,777	133,492	124,715
Allowance for borrowed funds used during construction	(5,873)	(5,199)	(10,355)	(10,193)
Total	62,230	57,578	123,137	114,522
INCOME BEFORE INCOME TAXES	195,306	265,996	220,729	302,160
INCOME TAXES	26,688	46,560	30,849	42,210
NET INCOME	168,618	219,436	189,880	259,950
Less: Comprehensive income attributable to noncontrolling interests	4,306	3,739	8,612	8,612
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	164,312	215,697	181,268	251,338
APS
OPERATING REVENUES (Note 2)	1,061,669	1,000,249	1,845,200	1,696,724
OPERATING EXPENSES
Fuel and purchased power	352,187	269,835	617,456	468,062
Operations and maintenance	242,273	226,698	456,874	453,099
Depreciation and amortization	186,477	158,728	373,060	316,528
Taxes other than income taxes	54,094	59,478	112,053	118,950
Other expenses	385	4,093	1,210	7,449
Total	835,416	718,832	1,560,653	1,364,088
OPERATING INCOME	226,253	281,417	284,547	332,636
OTHER INCOME (DEDUCTIONS)
Allowance for equity funds used during construction	12,086	9,990	21,833	19,197
Pension and other postretirement non-service credits - net (Note 5)	25,382	28,234	49,289	56,071
Other income (Note 9)	1,396	11,563	2,548	23,523
Other expense (Note 9)	(2,786)	(4,261)	(4,634)	(7,611)
Total	36,078	45,526	69,036	91,180
INTEREST EXPENSE
Interest charges	64,223	59,930	126,532	119,318
Allowance for borrowed funds used during construction	(5,689)	(5,199)	(10,111)	(10,193)
Total	58,534	54,731	116,421	109,125
INCOME BEFORE INCOME TAXES	203,797	272,212	237,162	314,691
INCOME TAXES	29,522	48,725	34,381	51,044
NET INCOME	174,275	223,487	202,781	263,647
Less: Comprehensive income attributable to noncontrolling interests	4,306	3,739	8,612	8,612
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS	$ 169,969	$ 219,748	$ 194,169	$ 255,035