CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	$ 410,212	$ 414,161
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	428,121	371,722
Deferred fuel and purchased power	(137)	(26,880)
Deferred fuel and purchased power amortization	19,284	31,724
Allowance for equity funds used during construction	(26,214)	(21,979)
Deferred income taxes	168,071	136,777
Deferred investment tax credit	9,542	25,206
Change in derivative instruments fair value	(261)	300
Changes in current assets and liabilities:
Customer and other receivables	(107,263)	(149,053)
Accrued unbilled revenues	(61,736)	(59,240)
Materials, supplies and fossil fuel	(22,537)	(3,346)
Income tax receivable	3,098	135,517
Other current assets	1,994	(4,428)
Accounts payable	(53,247)	(7,171)
Accrued taxes	110,066	118,934
Other current liabilities	16,952	48,407
Change in margin and collateral accounts — assets	(1,291)	(475)
Change in margin and collateral accounts — liabilities	30,678	(20,875)
Change in unrecognized tax benefits	(9,276)	1,744
Change in other long-term assets	15,042	(50,005)
Change in other long-term liabilities	(109,725)	(54,122)
Net cash flow provided by operating activities	821,373	886,918
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(778,700)	(618,658)
Contributions in aid of construction	33,982	8,537
Allowance for borrowed funds used during construction	(12,056)	(11,039)
Proceeds from nuclear decommissioning trust sales	330,304	269,276
Investment in nuclear decommissioning trust	(343,488)	(282,212)
Other	(2,830)	339
Net cash flow used for investing activities	(772,788)	(633,757)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	600,000	574,126
Repayment of long-term debt	(344,847)	(503,583)
Short-term borrowings and payments — net	(90,400)	(133,975)
Dividends paid on common stock	(192,466)	(187,778)
Common stock equity issuance	12,543	14,860
Distributions to noncontrolling interest	(28,012)	(15,869)
Other	0	3
Net cash flow used for financing activities	(43,182)	(252,216)
NET INCREASE IN CASH AND CASH EQUIVALENTS	5,403	945
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	7,604	9,526
CASH AND CASH EQUIVALENTS AT END OF PERIOD	13,007	10,471
Cash paid (received) during the period for:
Income taxes, net of refunds	2,692	(131,154)
Interest, net of amounts capitalized	143,116	145,285
Significant non-cash investing and financing activities:
Accrued capital expenditures	36,718	24,135
Arizona Public Service Company
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	420,489	427,460
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	428,042	371,651
Deferred fuel and purchased power	(137)	(26,880)
Deferred fuel and purchased power amortization	19,284	31,724
Allowance for equity funds used during construction	(26,214)	(21,979)
Deferred income taxes	72,737	77,435
Deferred investment tax credit	9,542	25,206
Change in derivative instruments fair value	(261)	300
Changes in current assets and liabilities:
Customer and other receivables	(106,236)	(149,725)
Accrued unbilled revenues	(61,736)	(59,240)
Materials, supplies and fossil fuel	(22,537)	(3,346)
Income tax receivable	0	135,179
Other current assets	2,676	(4,575)
Accounts payable	(52,919)	(10,055)
Accrued taxes	215,524	178,186
Other current liabilities	7,759	55,127
Change in margin and collateral accounts — assets	(1,291)	(474)
Change in margin and collateral accounts — liabilities	30,678	(20,875)
Change in unrecognized tax benefits	(9,276)	1,744
Change in other long-term assets	14,244	(49,635)
Change in other long-term liabilities	(108,410)	(54,940)
Net cash flow provided by operating activities	831,958	902,288
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(778,207)	(618,658)
Contributions in aid of construction	33,982	8,537
Allowance for borrowed funds used during construction	(12,019)	(11,039)
Proceeds from nuclear decommissioning trust sales	330,304	269,276
Investment in nuclear decommissioning trust	(343,488)	(282,212)
Other	(840)	339
Net cash flow used for investing activities	(770,268)	(633,757)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	600,000	574,126
Repayment of long-term debt	(344,847)	(503,583)
Short-term borrowings and payments — net	(90,400)	(133,975)
Dividends paid on common stock	(197,600)	(187,800)
Distributions to noncontrolling interest	(28,012)	(15,869)
Net cash flow used for financing activities	(60,859)	(267,101)
NET INCREASE IN CASH AND CASH EQUIVALENTS	831	1,430
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	4,515	3,725
CASH AND CASH EQUIVALENTS AT END OF PERIOD	5,346	5,155
Cash paid (received) during the period for:
Income taxes, net of refunds	5,504	(119,440)
Interest, net of amounts capitalized	141,216	142,364
Significant non-cash investing and financing activities:
Accrued capital expenditures	$ 36,718	$ 24,135