CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	$ 233,325	$ 171,810
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	343,173	332,185
Deferred fuel and purchased power	(26,473)	(16,702)
Deferred fuel and purchased power amortization	(4,815)	23,307
Allowance for equity funds used during construction	(16,508)	(18,760)
Deferred income taxes	22,229	4,326
Deferred investment tax credit	(3,386)	(2,656)
Stock compensation	9,130	13,725
Customer and other receivables	7,767	3,543
Changes in current assets and liabilities:
Accrued unbilled revenues	(63,413)	(56,487)
Materials, supplies and fossil fuel	10,295	(21,287)
Income tax receivable	4,605	0
Other current assets	(24,896)	(16,121)
Accounts payable	17,772	65,874
Accrued taxes	6,588	4,102
Other current liabilities	(45,334)	(61,270)
Change in other long-term assets	(4,885)	(82,850)
Change in other long-term liabilities	(96,142)	3,195
Net cash flow provided by operating activities	369,032	345,934
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(676,973)	(541,401)
Contributions in aid of construction	31,295	18,909
Allowance for borrowed funds used during construction	(8,825)	(11,159)
Proceeds from nuclear decommissioning trust sales and other special use funds	391,859	309,354
Investment in nuclear decommissioning trust and other special use funds	(393,000)	(310,494)
Other	3,123	7,153
Net cash flow used for investing activities	(652,521)	(527,638)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	1,088,886	497,324
Short-term borrowing and payments — net	184,225	363,973
Short-term debt borrowings	751,690	49,000
Short-term debt repayments	(758,690)	(57,000)
Repayment of long-term debt	(800,000)	(500,000)
Dividends paid on common stock	(172,566)	(161,979)
Common stock equity issuance - net of purchases	(2,204)	(2,360)
Distributions to noncontrolling interests	(11,372)	(11,372)
Net cash flow provided by financing activities	279,969	177,586
NET DECREASE IN CASH AND CASH EQUIVALENTS	(3,520)	(4,118)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	10,283	5,766
CASH AND CASH EQUIVALENTS AT END OF PERIOD	6,763	1,648
APS
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	242,210	188,199
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	343,130	332,143
Deferred fuel and purchased power	(26,473)	(16,702)
Deferred fuel and purchased power amortization	(4,815)	23,307
Allowance for equity funds used during construction	(16,508)	(18,760)
Deferred income taxes	15,233	(10,625)
Deferred investment tax credit	(3,386)	(2,656)
Customer and other receivables	824	3,645
Changes in current assets and liabilities:
Accrued unbilled revenues	(63,413)	(56,487)
Materials, supplies and fossil fuel	10,295	(21,287)
Income tax receivable	7,313	0
Other current assets	(19,752)	(14,613)
Accounts payable	17,915	68,399
Accrued taxes	14,551	(435)
Other current liabilities	(40,381)	(57,709)
Change in other long-term assets	(7,356)	(84,946)
Change in other long-term liabilities	(91,983)	3,253
Net cash flow provided by operating activities	377,404	334,726
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(676,973)	(541,401)
Contributions in aid of construction	31,295	18,909
Allowance for borrowed funds used during construction	(8,825)	(11,159)
Proceeds from nuclear decommissioning trust sales and other special use funds	391,859	309,354
Investment in nuclear decommissioning trust and other special use funds	(393,000)	(310,494)
Other	(169)	(1,612)
Net cash flow used for investing activities	(655,813)	(536,403)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	591,936	497,324
Short-term borrowing and payments — net	219,900	376,873
Short-term debt borrowings	540,000	0
Short-term debt repayments	(540,000)	0
Repayment of long-term debt	(350,000)	(500,000)
Dividends paid on common stock	(176,000)	(165,500)
Distributions to noncontrolling interests	(11,372)	(11,372)
Net cash flow provided by financing activities	274,464	197,325
NET DECREASE IN CASH AND CASH EQUIVALENTS	(3,945)	(4,352)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	10,169	5,707
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 6,224	$ 1,355