CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	$ 403,408	$ 410,212
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	422,851	428,121
Deferred fuel and purchased power	(46,185)	(137)
Deferred fuel and purchased power amortization	28,366	19,284
Allowance for equity funds used during construction	(31,079)	(26,214)
Deferred income taxes	194,915	168,071
Deferred investment tax credit	(6,342)	9,542
Change in derivative instruments fair value	(278)	(261)
Changes in current assets and liabilities:
Customer and other receivables	(77,908)	(107,263)
Accrued unbilled revenues	(54,291)	(61,736)
Materials, supplies and fossil fuel	(4,438)	(22,537)
Income tax receivable	589	3,098
Other current assets	(11,665)	1,994
Accounts payable	(57,237)	(53,247)
Accrued taxes	80,925	110,066
Other current liabilities	(12,383)	16,952
Change in margin and collateral accounts — assets	517	(1,291)
Change in margin and collateral accounts — liabilities	18,085	30,678
Change in unrecognized tax benefits	1,628	(9,276)
Change in other long-term assets	(59,589)	17,753
Change in other long-term liabilities	(24,839)	(112,436)
Net cash flow provided by operating activities	765,050	821,373
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(1,014,910)	(778,700)
Contributions in aid of construction	39,355	33,982
Allowance for borrowed funds used during construction	(14,848)	(12,056)
Proceeds from nuclear decommissioning trust sales	447,419	330,304
Investment in nuclear decommissioning trust	(449,129)	(343,488)
Other	(18,353)	(2,830)
Net cash flow used for investing activities	(1,010,466)	(772,788)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	693,151	600,000
Repayment of long-term debt	(353,560)	(344,847)
Short-term borrowing and payments — net	117,300	(90,400)
Dividends paid on common stock	(203,115)	(192,466)
Common stock equity issuance - net of purchases	11,790	12,543
Distributions to noncontrolling interests	(11,372)	(28,012)
Other	1	0
Net cash flow provided by (used for) financing activities	254,195	(43,182)
NET INCREASE IN CASH AND CASH EQUIVALENTS	8,779	5,403
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	39,488	7,604
CASH AND CASH EQUIVALENTS AT END OF PERIOD	48,267	13,007
Cash paid during the period for:
Income taxes, net of refunds	2,562	2,692
Interest, net of amounts capitalized	146,691	143,116
Significant non-cash investing and financing activities:
Accrued capital expenditures	91,315	36,718
Arizona Public Service Company
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	418,281	420,489
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	422,365	428,042
Deferred fuel and purchased power	(46,185)	(137)
Deferred fuel and purchased power amortization	28,366	19,284
Allowance for equity funds used during construction	(31,079)	(26,214)
Deferred income taxes	171,000	72,737
Deferred investment tax credit	(6,342)	9,542
Change in derivative instruments fair value	(278)	(261)
Changes in current assets and liabilities:
Customer and other receivables	(75,961)	(106,236)
Accrued unbilled revenues	(54,291)	(61,736)
Materials, supplies and fossil fuel	(4,368)	(22,537)
Other current assets	(9,857)	2,676
Accounts payable	(56,349)	(52,919)
Accrued taxes	107,955	215,524
Other current liabilities	(30,973)	7,759
Change in margin and collateral accounts — assets	517	(1,291)
Change in margin and collateral accounts — liabilities	18,085	30,678
Change in unrecognized tax benefits	1,628	(9,276)
Change in other long-term assets	(54,051)	16,955
Change in other long-term liabilities	(32,146)	(111,121)
Net cash flow provided by operating activities	766,317	831,958
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(992,735)	(778,207)
Contributions in aid of construction	39,355	33,982
Allowance for borrowed funds used during construction	(14,359)	(12,019)
Proceeds from nuclear decommissioning trust sales	447,419	330,304
Investment in nuclear decommissioning trust	(449,129)	(343,488)
Other	(14,016)	(840)
Net cash flow used for investing activities	(983,465)	(770,268)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	693,151	600,000
Repayment of long-term debt	(353,560)	(344,847)
Short-term borrowing and payments — net	83,300	(90,400)
Dividends paid on common stock	(208,400)	(197,600)
Distributions to noncontrolling interests	(11,372)	(28,012)
Net cash flow provided by (used for) financing activities	203,119	(60,859)
NET INCREASE IN CASH AND CASH EQUIVALENTS	(14,029)	831
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	22,056	4,515
CASH AND CASH EQUIVALENTS AT END OF PERIOD	8,027	5,346
Cash paid during the period for:
Income taxes, net of refunds	10,533	5,504
Interest, net of amounts capitalized	144,984	141,216
Significant non-cash investing and financing activities:
Accrued capital expenditures	$ 90,069	$ 36,718