CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	$ 28,185	$ 9,326
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	147,861	140,759
Deferred fuel and purchased power	(988)	1,007
Deferred fuel and purchased power amortization	(4,172)	2,388
Allowance for equity funds used during construction	(9,482)	(10,516)
Deferred income taxes	10,357	3,468
Deferred investment tax credit	(344)	(114)
Change in derivative instruments fair value	(101)	(111)
Stock compensation	9,997	16,687
Changes in current assets and liabilities:
Customer and other receivables	47,007	47,282
Accrued unbilled revenues	6,723	6,445
Materials, supplies and fossil fuel	(667)	1,525
Income tax receivable	(5,780)	(4,048)
Other current assets	(17,353)	(8,131)
Accounts payable	22,147	(38,443)
Accrued taxes	43,706	43,289
Other current liabilities	(101,801)	(38,040)
Change in margin and collateral accounts — assets	(12)	681
Change in margin and collateral accounts — liabilities	0	410
Change in other long-term assets	(36,836)	(17,504)
Change in other long-term liabilities	1,604	(12,151)
Net cash flow provided by operating activities	140,051	144,209
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(348,824)	(378,500)
Contributions in aid of construction	5,975	12,464
Allowance for borrowed funds used during construction	(4,472)	(5,227)
Proceeds from nuclear decommissioning trust sales	151,126	141,809
Investment in nuclear decommissioning trust	(151,696)	(142,379)
Other	(793)	(472)
Net cash flow used for investing activities	(348,684)	(372,305)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	255,441	0
Short-term borrowing and payments — net	22,097	261,800
Short-term debt borrowings under revolving credit facility	8,000	0
Dividends paid on common stock	(71,177)	(67,611)
Common stock equity issuance - net of purchases	(11,580)	8,902
Other	(1)	1
Net cash flow provided by financing activities	202,780	203,092
NET DECREASE IN CASH AND CASH EQUIVALENTS	(5,853)	(25,004)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	8,881	39,488
CASH AND CASH EQUIVALENTS AT END OF PERIOD	3,028	14,484
Cash paid during the period for:
Income taxes, net of refunds	(2)	2,502
Interest, net of amounts capitalized	54,280	56,139
Significant non-cash investing and financing activities:
Accrued capital expenditures	79,306	59,707
Arizona Public Service Company
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	28,035	12,126
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	147,443	140,729
Deferred fuel and purchased power	(988)	1,007
Deferred fuel and purchased power amortization	(4,172)	2,388
Allowance for equity funds used during construction	(9,482)	(10,516)
Deferred income taxes	8,899	3,394
Deferred investment tax credit	(344)	(114)
Change in derivative instruments fair value	(101)	(111)
Changes in current assets and liabilities:
Customer and other receivables	60,782	47,575
Accrued unbilled revenues	6,723	6,445
Materials, supplies and fossil fuel	(631)	1,525
Other current assets	(15,007)	(8,172)
Accounts payable	22,847	(34,999)
Accrued taxes	47,817	38,784
Other current liabilities	(88,990)	(28,748)
Change in margin and collateral accounts — assets	(12)	681
Change in margin and collateral accounts — liabilities	0	410
Change in other long-term assets	(31,172)	(17,375)
Change in other long-term liabilities	1,888	(1,102)
Net cash flow provided by operating activities	173,535	153,927
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(343,139)	(369,861)
Contributions in aid of construction	5,975	12,464
Allowance for borrowed funds used during construction	(4,472)	(5,040)
Proceeds from nuclear decommissioning trust sales	151,126	141,809
Investment in nuclear decommissioning trust	(151,696)	(142,379)
Other	(774)	(472)
Net cash flow used for investing activities	(342,980)	(363,479)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	255,441	0
Short-term borrowing and payments — net	(19,003)	261,800
Dividends paid on common stock	(72,900)	(69,400)
Net cash flow provided by financing activities	163,538	192,400
NET DECREASE IN CASH AND CASH EQUIVALENTS	(5,907)	(17,152)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	8,840	22,056
CASH AND CASH EQUIVALENTS AT END OF PERIOD	2,933	4,904
Cash paid during the period for:
Income taxes, net of refunds	0	8,772
Interest, net of amounts capitalized	53,129	55,580
Significant non-cash investing and financing activities:
Accrued capital expenditures	$ 78,977	$ 59,707