CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 557,813	$ 530,540	$ 507,949
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	664,140	650,955	610,629
Deferred fuel and purchased power	(82,481)	(78,277)	(48,405)
Deferred fuel and purchased power amortization	49,508	116,750	(14,767)
Allowance for equity funds used during construction	(31,431)	(52,319)	(47,011)
Deferred income taxes	(1,479)	117,355	248,164
Deferred investment tax credit	(3,938)	(5,170)	(4,587)
Change in derivative instruments fair value	0	0	(373)
Stock compensation	18,376	19,547	20,502
Changes in current assets and liabilities:
Customer and other receivables	(12,789)	37,530	(93,797)
Accrued unbilled revenues	9,005	(24,736)	(4,485)
Materials, supplies and fossil fuel	(51,826)	(6,103)	(6,683)
Income tax receivable	(21,727)	0	3,751
Other current assets	(3,507)	33,844	(10,580)
Accounts payable	50,641	(14,602)	(23,769)
Accrued taxes	(9,920)	6,597	9,982
Other current liabilities	(84,651)	28,174	19,154
Change in margin and collateral accounts — assets	(247)	143	(300)
Change in margin and collateral accounts — liabilities	(125)	(2,211)	(533)
Change in unrecognized tax benefits	2,704	(1,235)	5,891
Change in long-term regulatory liabilities	124,221	(109,284)	45,764
Change in other long-term assets	(82,895)	78,604	(68,480)
Change in other long-term liabilities	(132,666)	(48,958)	(29,980)
Net cash flow provided by operating activities	956,726	1,277,144	1,118,036
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,191,447)	(1,178,169)	(1,408,774)
Contributions in aid of construction	70,693	27,716	23,708
Allowance for borrowed funds used during construction	(18,528)	(25,180)	(22,112)
Proceeds from nuclear decommissioning trust sales and other special use funds	719,034	653,033	542,246
Investment in nuclear decommissioning trust and other special use funds	(722,181)	(672,165)	(544,527)
Other	11,452	1,941	(19,078)
Net cash flow used for investing activities	(1,130,977)	(1,192,824)	(1,428,537)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	1,092,188	445,245	848,239
Repayment of long-term debt	(600,000)	(182,000)	(125,000)
Short-term borrowings and (repayments) — net	54,275	(7,000)	(107,800)
Short-term debt borrowings under revolving credit facility	49,000	45,000	58,000
Short-term debt repayments under revolving credit facility	(65,000)	(57,000)	(32,000)
Dividends paid on common stock	(329,643)	(308,892)	(289,793)
Common stock equity issuance and purchases - net	692	(5,055)	(13,390)
Distributions to noncontrolling interests	(22,744)	(22,744)	(22,744)
Net cash flow provided by (used for) financing activities	178,768	(92,446)	315,512
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	4,517	(8,126)	5,011
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	5,766	13,892	8,881
CASH AND CASH EQUIVALENTS AT END OF YEAR	10,283	5,766	13,892
ARIZONA PUBLIC SERVICE COMPANY
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	584,764	589,758	523,802
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	664,055	649,295	608,935
Deferred fuel and purchased power	(82,481)	(78,277)	(48,405)
Deferred fuel and purchased power amortization	49,508	116,750	(14,767)
Allowance for equity funds used during construction	(31,431)	(52,319)	(47,011)
Deferred income taxes	48,367	59,927	249,465
Deferred investment tax credit	(3,938)	(5,170)	(4,587)
Change in derivative instruments fair value	0	0	(373)
Changes in current assets and liabilities:
Customer and other receivables	(12,075)	35,406	(68,040)
Accrued unbilled revenues	9,005	(24,736)	(4,485)
Materials, supplies and fossil fuel	(51,826)	(6,206)	(6,503)
Income tax receivable	(7,313)	0	11,174
Other current assets	(1,461)	31,707	(6,775)
Accounts payable	53,258	(15,608)	(26,561)
Accrued taxes	(40,029)	19,008	26,773
Other current liabilities	(82,138)	25,070	27,912
Change in margin and collateral accounts — assets	(247)	143	(300)
Change in margin and collateral accounts — liabilities	(125)	(2,211)	(533)
Change in unrecognized tax benefits	2,704	(1,235)	5,891
Change in long-term regulatory liabilities	124,221	(109,284)	45,764
Change in other long-term assets	(85,725)	77,952	(78,540)
Change in other long-term liabilities	(129,682)	(55,169)	(31,106)
Net cash flow provided by operating activities	1,007,411	1,254,801	1,161,730
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,191,447)	(1,169,061)	(1,381,930)
Contributions in aid of construction	70,693	27,716	23,708
Allowance for borrowed funds used during construction	(18,528)	(25,180)	(22,112)
Proceeds from nuclear decommissioning trust sales and other special use funds	719,034	653,033	542,246
Investment in nuclear decommissioning trust and other special use funds	(722,181)	(672,165)	(544,527)
Other	6,336	(1,789)	(18,538)
Net cash flow used for investing activities	(1,136,093)	(1,187,446)	(1,401,153)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	1,092,188	295,245	549,478
Repayment of long-term debt	(600,000)	(182,000)	0
Short-term borrowings and (repayments) — net	0	0	(135,500)
Short-term debt borrowings under revolving credit facility	0	25,000	0
Short-term debt repayments under revolving credit facility	0	(25,000)	0
Dividends paid on common stock	(336,300)	(316,000)	(296,800)
Equity infusion from Pinnacle West	0	150,000	150,000
Distributions to noncontrolling interests	(22,744)	(22,744)	(22,744)
Net cash flow provided by (used for) financing activities	133,144	(75,499)	244,434
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	4,462	(8,144)	5,011
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	5,707	13,851	8,840
CASH AND CASH EQUIVALENTS AT END OF YEAR	$ 10,169	$ 5,707	$ 13,851