CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 635,944	$ 570,052	$ 557,813
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	719,141	686,253	664,140
Deferred fuel and purchased power	(256,871)	(93,651)	(82,481)
Deferred fuel and purchased power amortization	44,557	(12,047)	49,508
Allowance for equity funds used during construction	(41,737)	(33,776)	(31,431)
Deferred income taxes	117,471	69,469	(1,479)
Deferred investment tax credit	(4,802)	(5,096)	(3,938)
Changes in current assets and liabilities:
Customer and other receivables	(72,559)	(18,191)	(12,789)
Accrued unbilled revenues	(1,783)	(4,032)	9,005
Materials, supplies and fossil fuel	(32,870)	11,623	(51,826)
Income tax receivable	(722)	14,935	(21,727)
Other current assets	(22,720)	(30,640)	(3,507)
Accounts payable	20,267	(6,059)	50,641
Accrued taxes	9,094	14,652	(9,920)
Other current liabilities	(52,086)	22,520	(84,651)
Change in margin and collateral accounts — assets	(50)	404	(247)
Change in margin and collateral accounts — liabilities	350	100	(125)
Change in unrecognized tax benefits	(568)	2,220	2,704
Change in long-term regulatory liabilities	57,549	13,017	124,221
Change in other long-term assets	(246,473)	(67,453)	(82,895)
Change in other long-term liabilities	(29,578)	(186,227)	(132,666)
Net cash provided by operating activities	860,014	966,365	956,726
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,473,475)	(1,326,584)	(1,191,447)
Contributions in aid of construction	105,654	62,503	70,693
Allowance for borrowed funds used during construction	(21,052)	(18,530)	(18,528)
Proceeds from nuclear decommissioning trust sales and other special use funds	1,720,966	819,518	719,034
Investment in nuclear decommissioning trust and other special use funds	(1,725,480)	(822,608)	(722,181)
Other	6,458	7,883	11,452
Net cash used for investing activities	(1,386,929)	(1,277,818)	(1,130,977)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	746,999	1,596,672	1,092,188
Repayment of long-term debt	0	(915,150)	(600,000)
Short-term borrowings and (repayments) — net	142,000	73,325	54,275
Short-term debt borrowings under revolving credit facility	0	751,690	49,000
Short-term debt repayments under revolving credit facility	(19,000)	(770,690)	(65,000)
Dividends paid on common stock	(369,478)	(350,577)	(329,643)
Noncontrolling interests	(21,255)	(22,743)	(22,744)
Net cash provided by financing activities	476,916	361,138	178,768
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(49,999)	49,685	4,517
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	59,968	10,283	5,766
CASH AND CASH EQUIVALENTS AT END OF YEAR	9,969	59,968	10,283
Arizona Public Service Company
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	649,503	587,521	584,764
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	719,039	686,168	664,055
Deferred fuel and purchased power	(256,871)	(93,651)	(82,481)
Deferred fuel and purchased power amortization	44,557	(12,047)	49,508
Allowance for equity funds used during construction	(41,737)	(33,776)	(31,431)
Deferred income taxes	128,852	36,462	48,367
Deferred investment tax credit	(4,802)	(5,096)	(3,938)
Changes in current assets and liabilities:
Customer and other receivables	(72,101)	(28,206)	(12,075)
Accrued unbilled revenues	(1,783)	(4,032)	9,005
Materials, supplies and fossil fuel	(32,870)	11,623	(51,826)
Income tax receivable	(10,756)	7,313	(7,313)
Other current assets	(25,587)	(24,669)	(1,461)
Accounts payable	23,510	(4,503)	53,258
Accrued taxes	3,042	12,642	(40,029)
Other current liabilities	(61,647)	29,587	(82,138)
Change in margin and collateral accounts — assets	(50)	404	(247)
Change in margin and collateral accounts — liabilities	350	100	(125)
Change in unrecognized tax benefits	(568)	2,220	2,704
Change in long-term regulatory liabilities	57,549	13,017	124,221
Change in other long-term assets	(231,804)	(65,139)	(85,725)
Change in other long-term liabilities	(20,272)	(186,871)	(129,682)
Net cash provided by operating activities	865,554	929,067	1,007,411
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,471,795)	(1,326,584)	(1,191,447)
Contributions in aid of construction	105,654	62,503	70,693
Allowance for borrowed funds used during construction	(21,052)	(18,530)	(18,528)
Proceeds from nuclear decommissioning trust sales and other special use funds	1,720,966	819,518	719,034
Investment in nuclear decommissioning trust and other special use funds	(1,725,480)	(822,608)	(722,181)
Other	273	(554)	6,336
Net cash used for investing activities	(1,391,434)	(1,286,255)	(1,136,093)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	446,999	1,099,722	1,092,188
Repayment of long-term debt	0	(465,150)	(600,000)
Short-term borrowings and (repayments) — net	278,700	0	0
Short-term debt borrowings under revolving credit facility	0	540,000	0
Short-term debt repayments under revolving credit facility	0	(540,000)	0
Dividends paid on common stock	(376,500)	(357,500)	(336,300)
Equity infusion from Pinnacle West	150,000	150,000	0
Noncontrolling interests	(21,255)	(22,743)	(22,744)
Net cash provided by financing activities	477,944	404,329	133,144
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(47,936)	47,141	4,462
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	57,310	10,169	5,707
CASH AND CASH EQUIVALENTS AT END OF YEAR	$ 9,374	$ 57,310	$ 10,169