APS - CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 518,781	$ 500,826	$ 635,944
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	854,136	817,814	719,141
Deferred fuel and purchased power	(549,877)	(291,992)	(256,871)
Deferred fuel and purchased power amortization	547,243	219,579	44,557
Allowance for equity funds used during construction	(53,118)	(45,263)	(41,737)
Deferred income taxes	(24,310)	43,202	117,471
Deferred investment tax credit	77,065	(5,893)	(4,802)
Changes in current assets and liabilities:
Customer and other receivables	(61,983)	(63,869)	(72,559)
Accrued unbilled revenues	(2,789)	(30,784)	(1,783)
Materials, supplies and fossil fuel	(42,911)	(83,469)	(32,870)
Income tax receivable	13,754	(6,572)	(722)
Other current assets	(19,550)	76,089	(22,770)
Accounts payable	(75,623)	90,076	20,267
Accrued taxes	2,393	(4,205)	9,094
Other current liabilities	40,510	(1,856)	(51,736)
Change in long-term regulatory assets	(53,112)	(12,432)	17,012
Change in long-term regulatory liabilities	28,495	(332,470)	57,549
Change in other long-term assets	(195,598)	159,030	(345,470)
Change in operating lease assets	90,525	105,359	116,009
Change in other long-term liabilities	63,080	170,359	78,219
Change in operating lease liabilities	(65,779)	(103,671)	(108,365)
Net cash provided by operating activities	1,207,697	1,241,441	860,014
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,846,370)	(1,707,490)	(1,473,475)
Contributions in aid of construction	180,866	137,436	105,654
Allowance for borrowed funds used during construction	(43,564)	(28,030)	(21,052)
Proceeds from nuclear decommissioning trust sales and other special use funds	1,679,722	1,207,713	1,720,966
Investment in nuclear decommissioning trust and other special use funds	(1,681,845)	(1,212,063)	(1,725,480)
Other	(6,458)	(15,612)	6,458
Net cash used for investing activities	(1,694,249)	(1,618,046)	(1,386,929)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	689,349	875,537	746,999
Short-term borrowings and (repayments) — net	241,900	48,720	142,000
Dividends paid on common stock	(386,486)	(378,881)	(369,478)
Noncontrolling interests	(21,255)	(21,255)	(21,255)
Net cash provided by financing activities	486,675	371,468	476,916
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	123	(5,137)	(49,999)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	4,832	9,969	59,968
CASH AND CASH EQUIVALENTS AT END OF YEAR	4,955	4,832	9,969
Arizona Public Service Company
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	564,561	542,153	649,503
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	854,051	817,729	719,039
Deferred fuel and purchased power	(549,877)	(291,992)	(256,871)
Deferred fuel and purchased power amortization	547,243	219,579	44,557
Allowance for equity funds used during construction	(53,118)	(45,263)	(41,737)
Deferred income taxes	(10,314)	(6,817)	128,852
Deferred investment tax credit	77,065	(5,893)	(4,802)
Changes in current assets and liabilities:
Customer and other receivables	(62,716)	(60,930)	(72,101)
Accrued unbilled revenues	(2,789)	(30,784)	(1,783)
Materials, supplies and fossil fuel	(42,911)	(83,469)	(32,870)
Income tax receivable	1,102	9,654	(10,756)
Other current assets	(20,243)	59,970	(25,637)
Accounts payable	(70,622)	79,492	23,510
Accrued taxes	5,542	4,734	3,042
Other current liabilities	62,212	1,190	(61,297)
Change in long-term regulatory assets	53,112	12,432	(17,012)
Change in long-term regulatory liabilities	28,495	(332,470)	57,549
Change in other long-term assets	(188,483)	170,587	(330,642)
Change in operating lease assets	90,234	105,058	115,850
Change in other long-term liabilities	58,574	168,503	87,376
Change in operating lease liabilities	(65,482)	(103,361)	(108,216)
Net cash provided by operating activities	1,275,636	1,230,102	865,554
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,825,585)	(1,655,051)	(1,471,795)
Contributions in aid of construction	180,866	137,436	105,654
Allowance for borrowed funds used during construction	(39,030)	(26,839)	(21,052)
Proceeds from nuclear decommissioning trust sales and other special use funds	1,679,722	1,207,713	1,720,966
Investment in nuclear decommissioning trust and other special use funds	(1,681,845)	(1,212,063)	(1,725,480)
Other	(1,397)	(727)	273
Net cash used for investing activities	(1,687,269)	(1,549,531)	(1,391,434)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	496,025	524,852	446,999
Short-term borrowings and (repayments) — net	180,970	46,300	278,700
Dividends paid on common stock	(393,600)	(385,800)	(376,500)
Equity infusion from Pinnacle West	150,000	150,000	150,000
Noncontrolling interests	(21,255)	(21,255)	(21,255)
Net cash provided by financing activities	412,140	314,097	477,944
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	507	(5,332)	(47,936)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	4,042	9,374	57,310
CASH AND CASH EQUIVALENTS AT END OF YEAR	$ 4,549	$ 4,042	$ 9,374