CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 21,262	$ 40,514
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	203,639	176,409
Deferred fuel and purchased power	(6,110)	(52,210)
Deferred fuel and purchased power amortization	39,442	(564)
Allowance for equity funds used during construction	(9,747)	(9,207)
Deferred income taxes	3,835	(11,077)
Deferred investment tax credit	(319)	(529)
Changes in current assets and liabilities:
Customer and other receivables	66,146	50,545
Accrued unbilled revenues	1,215	10,163
Materials, supplies and fossil fuel	(11,892)	(4,801)
Income tax receivable	542	6,792
Other current assets	13,347	(9,042)
Accounts payable	(13,873)	24,465
Accrued taxes	53,847	53,985
Other current liabilities	(40,211)	(46,028)
Change in margin and collateral accounts — assets	8,600	0
Change in other long-term assets	52,153	(39,667)
Change in operating lease assets	324	2,890
Change in other long-term liabilities	(47,883)	(513)
Change in operating lease liabilities	953	(1,450)
Net cash provided by operating activities	340,608	202,012
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(391,583)	(363,775)
Contributions in aid of construction	28,262	15,296
Allowance for borrowed funds used during construction	(4,422)	(4,994)
Proceeds from nuclear decommissioning trusts sales and other special use funds	361,754	379,978
Investment in nuclear decommissioning trusts and other special use funds	(361,809)	(380,548)
Other	(6,543)	5,974
Net cash used for investing activities	(374,341)	(348,069)
CASH FLOWS FROM FINANCING ACTIVITIES
Short-term borrowing and (repayments) - net	(29,050)	49,750
Dividends paid on common stock	(94,265)	(91,721)
Net cash provided by financing activities	37,732	103,291
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	3,999	(42,766)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	9,969	59,968
CASH AND CASH EQUIVALENTS AT END OF PERIOD	13,968	17,202
APS
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	28,505	40,160
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization including nuclear fuel	203,617	176,389
Deferred fuel and purchased power	(6,110)	(52,210)
Deferred fuel and purchased power amortization	39,442	(564)
Allowance for equity funds used during construction	(9,747)	(9,207)
Deferred income taxes	(106)	(2,616)
Deferred investment tax credit	(319)	(529)
Changes in current assets and liabilities:
Customer and other receivables	65,736	50,103
Accrued unbilled revenues	1,215	10,163
Materials, supplies and fossil fuel	(11,892)	(4,801)
Income tax receivable	5,207	0
Other current assets	5,261	(8,825)
Accounts payable	(17,074)	23,881
Accrued taxes	57,718	62,204
Other current liabilities	(37,579)	(43,917)
Change in margin and collateral accounts — assets	8,600	0
Change in other long-term assets	53,827	(39,491)
Change in operating lease assets	254	2,865
Change in other long-term liabilities	(46,790)	782
Change in operating lease liabilities	1,027	(1,424)
Net cash provided by operating activities	340,792	202,963
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(386,873)	(363,775)
Contributions in aid of construction	28,262	15,296
Allowance for borrowed funds used during construction	(4,422)	(4,994)
Proceeds from nuclear decommissioning trusts sales and other special use funds	361,754	379,978
Investment in nuclear decommissioning trusts and other special use funds	(361,809)	(380,548)
Other	(258)	2,306
Net cash used for investing activities	(363,346)	(351,737)
CASH FLOWS FROM FINANCING ACTIVITIES
Short-term borrowing and (repayments) - net	(28,700)	199,500
Equity infusion	150,000	0
Dividends paid on common stock	(96,000)	(93,500)
Net cash provided by financing activities	25,300	106,000
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	2,746	(42,774)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	9,374	57,310
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 12,120	$ 14,536