CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	$ 9,326	$ 20,727
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	140,759	141,494
Deferred fuel and purchased power	1,007	17,671
Deferred fuel and purchased power amortization	2,388	5,614
Allowance for equity funds used during construction	(10,516)	(9,224)
Deferred income taxes	3,468	6,978
Deferred investment tax credit	(114)	(294)
Change in derivative instruments fair value	(111)	(104)
Changes in current assets and liabilities:
Customer and other receivables	47,282	39,174
Accrued unbilled revenues	6,445	6,133
Materials, supplies and fossil fuel	1,525	(9,995)
Income tax receivable	(4,048)	(219)
Other current assets	(8,131)	(9,631)
Accounts payable	(38,443)	(35,673)
Accrued taxes	43,289	48,111
Other current liabilities	(38,040)	(56,747)
Change in margin and collateral accounts — assets	681	(276)
Change in margin and collateral accounts — liabilities	410	(13,420)
Change in other long-term assets	(17,504)	(13,126)
Change in other long-term liabilities	4,536	6,955
Net cash flow provided by operating activities	144,209	144,148
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(378,500)	(251,041)
Contributions in aid of construction	12,464	27,222
Allowance for borrowed funds used during construction	(5,227)	(4,216)
Proceeds from nuclear decommissioning trust sales	141,809	115,282
Investment in nuclear decommissioning trust	(142,379)	(119,594)
Other	(472)	(470)
Net cash flow used for investing activities	(372,305)	(232,817)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	0	250,000
Short-term borrowings and payments — net	261,800	(102,900)
Dividends paid on common stock	(67,611)	(64,061)
Common stock equity issuance - net of purchases	8,902	9,690
Other	1	0
Net cash flow provided by financing activities	203,092	92,729
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(25,004)	4,060
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	39,488	7,604
CASH AND CASH EQUIVALENTS AT END OF PERIOD	14,484	11,664
Cash paid during the period for:
Income taxes, net of refunds	2,502	1,832
Interest, net of amounts capitalized	56,139	53,555
Significant non-cash investing and financing activities:
Accrued capital expenditures	59,707	56,165
Arizona Public Service Company
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	12,126	24,473
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	140,729	141,471
Deferred fuel and purchased power	1,007	17,671
Deferred fuel and purchased power amortization	2,388	5,614
Allowance for equity funds used during construction	(10,516)	(9,224)
Deferred income taxes	3,394	2,427
Deferred investment tax credit	(114)	(294)
Change in derivative instruments fair value	(111)	(104)
Changes in current assets and liabilities:
Customer and other receivables	47,575	43,070
Accrued unbilled revenues	6,445	6,133
Materials, supplies and fossil fuel	1,525	(9,995)
Other current assets	(8,172)	(9,116)
Accounts payable	(34,999)	(35,604)
Accrued taxes	38,784	59,057
Other current liabilities	(28,748)	(65,290)
Change in margin and collateral accounts — assets	681	(276)
Change in margin and collateral accounts — liabilities	410	(13,421)
Change in other long-term assets	(17,375)	(16,253)
Change in other long-term liabilities	(1,102)	12,635
Net cash flow provided by operating activities	153,927	152,974
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(369,861)	(250,930)
Contributions in aid of construction	12,464	27,222
Allowance for borrowed funds used during construction	(5,040)	(4,216)
Proceeds from nuclear decommissioning trust sales	141,809	115,282
Investment in nuclear decommissioning trust	(142,379)	(119,594)
Other	(472)	(470)
Net cash flow used for investing activities	(363,479)	(232,706)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	0	250,000
Short-term borrowings and payments — net	261,800	(102,900)
Dividends paid on common stock	(69,400)	(65,800)
Net cash flow provided by financing activities	192,400	81,300
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(17,152)	1,568
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	22,056	4,515
CASH AND CASH EQUIVALENTS AT END OF PERIOD	4,904	6,083
Cash paid during the period for:
Income taxes, net of refunds	8,772	184
Interest, net of amounts capitalized	55,580	52,825
Significant non-cash investing and financing activities:
Accrued capital expenditures	$ 59,707	$ 56,165