CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - Southwest - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
CASH FLOW FROM OPERATING ACTIVITIES:
Net income	$ 97,250	$ 118,845	$ 185,607	$ 284,825
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	122,646	93,442	400,245	337,816
Deferred income taxes	32,346	23,326	70,232	48,734
Changes in current assets and liabilities:
Accounts receivable, net of allowance	(44,971)	42,892	(139,417)	(51,717)
Accrued utility revenue	32,900	31,900	(1,500)	(2,400)
Deferred purchased gas costs	(82,248)	(291,469)	(134,507)	(265,385)
Accounts payable	(82,952)	(41,147)	8,621	11,882
Accrued taxes	33,964	34,636	(7,397)	19,430
Other current assets and liabilities	79,680	(5,255)	(4,274)	25,719
Gain on sale of property	(1,916)	(1,509)	(7,313)	(3,329)
Changes in undistributed stock compensation	4,180	3,658	9,816	7,956
Equity AFUDC	(258)	(981)	723	(4,644)
Changes in deferred charges and other assets	(297)	(10,379)	(3,459)	(49,465)
Changes in other liabilities and deferred credits	(3,704)	(50,416)	(26,917)	(57,365)
Net cash provided by (used in) operating activities	186,620	(52,457)	350,460	302,057
CASH FLOW FROM INVESTING ACTIVITIES:
Construction expenditures and property additions	(162,796)	(152,709)	(725,713)	(767,159)
Changes in customer advances	7,693	4,286	19,381	12,885
Other	893	3,563	15,586	8,136
Net cash used in investing activities	(154,210)	(144,860)	(3,045,006)	(746,138)
CASH FLOW FROM FINANCING ACTIVITIES:
Dividends paid	(35,970)	(32,619)	(141,573)	(128,117)
Issuance of long-term debt, net	709,927	10,659	2,359,964	573,058
Retirement of long-term debt	(143,453)	(21,228)	(574,889)	(302,466)
Change in credit facility and commercial paper	(130,000)	0	(150,000)	0
Withholding remittance - share-based compensation	(1,978)	(1,242)	(2,000)	(1,242)
Other	(7,898)	(1,353)	(7,274)	(4,505)
Net cash provided by financing activities	369,474	206,207	3,226,725	474,815
Change in cash and cash equivalents	401,969	8,993	532,321	31,380
Cash and cash equivalents at beginning of period	222,697	83,352	92,345	60,965
Cash and cash equivalents at end of period	624,666	92,345	624,666	92,345
SUPPLEMENTAL INFORMATION:
Interest paid, net of amounts capitalized	35,262	8,303	131,311	100,412
Income taxes paid (received), net	1,408	1,651	3,965	10,764
Southwest Gas Corporation
CASH FLOW FROM OPERATING ACTIVITIES:
Net income	111,795	118,715	180,215	194,234
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	72,114	68,698	256,814	239,268
Deferred income taxes	34,560	14,952	72,845	52,242
Changes in current assets and liabilities:
Accounts receivable, net of allowance	(55,219)	(27,631)	(50,394)	(25,673)
Accrued utility revenue	32,900	31,900	(1,500)	(2,400)
Deferred purchased gas costs	(76,809)	(291,469)	(129,068)	(265,385)
Accounts payable	(67,584)	(33,076)	23,256	18,441
Accrued taxes	30,835	41,851	(3,263)	(13,011)
Other current assets and liabilities	90,558	41,018	(20,731)	(9,694)
Gain on sale of property	(1,503)	0	(1,503)	0
Changes in undistributed stock compensation	3,239	2,908	6,723	5,706
Equity AFUDC	(76)	(981)	905	(4,644)
Changes in deferred charges and other assets	(6,439)	(13,535)	(21,647)	(61,484)
Changes in other liabilities and deferred credits	(4,033)	(48,782)	(27,637)	(58,008)
Net cash provided by (used in) operating activities	164,338	(95,432)	285,015	69,592
CASH FLOW FROM INVESTING ACTIVITIES:
Construction expenditures and property additions	(141,123)	(128,544)	(614,562)	(647,407)
Changes in customer advances	7,693	4,285	19,381	12,885
Other	(918)	(121)	(829)	681
Net cash used in investing activities	(134,348)	(124,380)	(596,010)	(633,841)
CASH FLOW FROM FINANCING ACTIVITIES:
Contributions from parent	0	45,984	156,599	173,906
Dividends paid	(29,200)	(26,000)	(114,600)	(105,300)
Issuance of long-term debt, net	593,862	0	891,180	446,508
Retirement of long-term debt	(25,000)	0	(25,000)	(125,000)
Change in credit facility and commercial paper	(130,000)	0	(150,000)	0
Change in short-term debt	0	210,000	(17,000)	170,000
Withholding remittance - share-based compensation	(1,978)	(1,242)	(1,999)	(1,242)
Other	(489)	(205)	(2,104)	(1,352)
Net cash provided by financing activities	407,195	228,537	737,076	557,520
Change in cash and cash equivalents	437,185	8,725	426,081	(6,729)
Cash and cash equivalents at beginning of period	38,691	41,070	49,795	56,524
Cash and cash equivalents at end of period	475,876	49,795	475,876	49,795
SUPPLEMENTAL INFORMATION:
Interest paid, net of amounts capitalized	15,757	6,952	99,045	93,474
Income taxes paid (received), net	$ 0	$ 0	$ (13,529)	$ 3,359