CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	$ 488,959	$ 499,591
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	500,801	489,861
Deferred fuel and purchased power	(60,911)	(82,486)
Deferred fuel and purchased power amortization	38,601	92,397
Allowance for equity funds used during construction	(24,677)	(39,411)
Deferred income taxes	83,703	117,571
Deferred investment tax credit	(7,288)	(7,397)
Stock compensation	16,486	16,140
Changes in current assets and liabilities:
Customer and other receivables	(91,506)	(65,203)
Accrued unbilled revenues	(18,666)	(83,939)
Materials, supplies and fossil fuel	(18,332)	(20,591)
Income tax receivable	(14,063)	0
Other current assets	(10,104)	23,661
Accounts payable	33,899	(11,399)
Accrued taxes	66,111	78,624
Other current liabilities	(68,927)	12,852
Change in other long-term assets	(52,276)	14,120
Change in other long-term liabilities	(27,049)	(74,628)
Net cash flow provided by operating activities	834,761	959,763
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(857,883)	(898,455)
Contributions in aid of construction	34,121	22,611
Allowance for borrowed funds used during construction	(14,645)	(18,959)
Proceeds from nuclear decommissioning trust sales and other special use funds	520,996	443,215
Investment in nuclear decommissioning trust and other special use funds	(523,573)	(461,777)
Other	8,971	49
Net cash flow used for investing activities	(832,013)	(913,316)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	794,981	295,245
Short-term borrowing and payments — net	(6,025)	19,800
Short-term debt borrowings	49,000	45,000
Short-term debt repayments	(62,000)	(32,000)
Repayment of long-term debt	(500,000)	(82,000)
Dividends paid on common stock	(243,116)	(228,037)
Common stock equity issuance - net of purchases	(130)	(1,984)
Distributions to noncontrolling interests	(11,372)	(11,372)
Net cash flow provided by financing activities	21,338	4,652
NET INCREASE IN CASH AND CASH EQUIVALENTS	24,086	51,099
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	5,766	13,892
CASH AND CASH EQUIVALENTS AT END OF PERIOD	29,852	64,991
APS
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	511,942	540,409
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	500,737	488,223
Deferred fuel and purchased power	(60,911)	(82,486)
Deferred fuel and purchased power amortization	38,601	92,397
Allowance for equity funds used during construction	(24,677)	(39,411)
Deferred income taxes	97,002	86,319
Deferred investment tax credit	(7,288)	(7,397)
Changes in current assets and liabilities:
Customer and other receivables	(90,817)	(56,874)
Accrued unbilled revenues	(18,666)	(83,939)
Materials, supplies and fossil fuel	(18,332)	(20,694)
Income tax receivable	(15,982)	0
Other current assets	(8,642)	20,258
Accounts payable	37,004	(8,857)
Accrued taxes	38,963	106,172
Other current liabilities	(66,368)	9,289
Change in other long-term assets	(54,872)	25,405
Change in other long-term liabilities	(27,521)	(80,895)
Net cash flow provided by operating activities	830,173	987,919
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(857,883)	(889,347)
Contributions in aid of construction	34,121	22,611
Allowance for borrowed funds used during construction	(14,645)	(18,959)
Proceeds from nuclear decommissioning trust sales and other special use funds	520,996	443,040
Investment in nuclear decommissioning trust and other special use funds	(523,573)	(461,602)
Other	(3,563)	(1,261)
Net cash flow used for investing activities	(844,547)	(905,518)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	794,981	295,245
Short-term borrowing and payments — net	2,900	0
Short-term debt borrowings	0	25,000
Short-term debt repayments	0	(25,000)
Repayment of long-term debt	(500,000)	(82,000)
Dividends paid on common stock	(248,300)	(233,300)
Distributions to noncontrolling interests	(11,372)	(11,372)
Net cash flow provided by financing activities	38,209	(31,427)
NET INCREASE IN CASH AND CASH EQUIVALENTS	23,835	50,974
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	5,707	13,851
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 29,542	$ 64,825