CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	$ 34,866	$ 22,791
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	173,168	167,801
Deferred fuel and purchased power	(5,785)	16,709
Deferred fuel and purchased power amortization	(1,808)	12,872
Allowance for equity funds used during construction	(7,697)	(11,188)
Deferred income taxes	(18,086)	3,620
Deferred investment tax credit	(465)	(353)
Stock compensation	6,282	12,074
Increase (Decrease) in Accounts and Notes Receivable	(25,575)	(15,476)
Changes in current assets and liabilities:
Accrued unbilled revenues	34,731	23,093
Materials, supplies and fossil fuel	5,445	(13,057)
Income tax receivable	1,128	0
Increase (Decrease) in Prepaid Expense	20,202	10,115
Accounts payable	(5,192)	26,593
Accrued taxes	49,833	45,130
Other current liabilities	(63,096)	(86,250)
Change in other long-term assets	81,143	(65,470)
Change in other long-term liabilities	(106,212)	13,706
Net cash flow provided by operating activities	183,628	173,432
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(340,014)	(259,792)
Contributions in aid of construction	3,152	7,938
Allowance for borrowed funds used during construction	(4,076)	(6,665)
Proceeds from nuclear decommissioning trust sales and other special use funds	195,087	179,048
Investment in nuclear decommissioning trust and other special use funds	(195,658)	(179,618)
Other	349	4,576
Net cash flow used for investing activities	(341,160)	(254,513)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	0	497,324
Short-term borrowing and payments — net	(76,675)	172,650
Short-term debt borrowings	751,690	0
Short-term debt repayments	(226,690)	(5,000)
Repayment of long-term debt	(150,000)	(500,000)
Dividends paid on common stock	(86,257)	(80,897)
Common stock equity issuance - net of purchases	(1,680)	(2,653)
Net cash flow provided by financing activities	210,388	81,424
NET INCREASE IN CASH AND CASH EQUIVALENTS	52,856	343
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	10,283	5,766
CASH AND CASH EQUIVALENTS AT END OF PERIOD	63,139	6,109
APS
CASH FLOWS FROM OPERATING ACTIVITIES
NET INCOME	40,218	33,149
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	173,147	167,779
Deferred fuel and purchased power	(5,785)	16,709
Deferred fuel and purchased power amortization	(1,808)	12,872
Allowance for equity funds used during construction	(7,697)	(11,188)
Deferred income taxes	(17,782)	(1,205)
Deferred investment tax credit	(465)	(353)
Increase (Decrease) in Accounts and Notes Receivable	(15,045)	(16,541)
Changes in current assets and liabilities:
Accrued unbilled revenues	34,731	23,093
Materials, supplies and fossil fuel	5,445	(13,057)
Income tax receivable	(1,411)	0
Increase (Decrease) in Prepaid Expense	18,164	9,598
Accounts payable	(4,038)	30,774
Accrued taxes	54,243	54,234
Other current liabilities	(49,149)	(81,627)
Change in other long-term assets	82,178	(64,516)
Change in other long-term liabilities	(105,117)	14,525
Net cash flow provided by operating activities	193,591	188,132
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(340,014)	(259,446)
Contributions in aid of construction	3,152	7,938
Allowance for borrowed funds used during construction	(4,076)	(6,665)
Proceeds from nuclear decommissioning trust sales and other special use funds	195,087	179,048
Investment in nuclear decommissioning trust and other special use funds	(195,658)	(179,618)
Other	(900)	(1,140)
Net cash flow used for investing activities	(342,409)	(259,883)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of long-term debt	0	497,324
Short-term borrowing and payments — net	0	157,500
Short-term debt borrowings	540,000	0
Short-term debt repayments	(110,000)	0
Repayment of long-term debt	(150,000)	(500,000)
Dividends paid on common stock	(88,000)	(82,700)
Net cash flow provided by financing activities	192,000	72,124
NET INCREASE IN CASH AND CASH EQUIVALENTS	43,182	373
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	10,169	5,707
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 53,351	$ 6,080