10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

Form 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2022

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission         File Number	Exact name of registrant as specified in its charter and principal office address and telephone number			State of Incorporation	I.R.S. Employer Identification No.
001-37976	Southwest Gas Holdings, Inc.			Delaware	81-3881866
	8360 S. Durango Drive
	Post Office Box 98510
	Las Vegas,	Nevada	89193-8510
	(702)	876-7237
1-7850	Southwest Gas Corporation			California	88-0085720
	8360 S. Durango Drive
	Post Office Box 98510
	Las Vegas,	Nevada	89193-8510
	(702)	876-7237

Securities registered pursuant to Section 12(b) of the Act:
Title of each class	Trading Symbol	Name of each exchange on which registered
Southwest Gas Holdings, Inc. Common Stock, $1 Par Value	SWX	New York Stock Exchange
Preferred Stock Purchase Rights	N/A	New York Stock Exchange

Indicate by check mark whether each registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that each registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒    No  ☐

Indicate by check mark whether each registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that each registrant was required to submit such files).    Yes  ☒    No  ☐

Indicate by check mark whether each registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “non-accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Southwest Gas Holdings, Inc.:

Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Southwest Gas Corporation:

Large accelerated filer	☐	Accelerated filer	☐
Non-accelerated filer	☒	Smaller reporting company	☐
Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Indicate by check mark whether each registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐    No  ☒

Indicate the number of shares outstanding of each of the issuer’s classes of common stock as of the latest practicable date.

Southwest Gas Holdings, Inc. Common Stock, $1 Par Value, 67,007,222 shares as of July 29, 2022.

All of the outstanding shares of common stock ($1 par value) of Southwest Gas Corporation were held by Southwest Gas Holdings, Inc. as of July 29, 2022.

SOUTHWEST GAS CORPORATION MEETS THE CONDITIONS SET FORTH IN GENERAL INSTRUCTION (H)(1)(a) and (b) OF FORM 10-Q AND IS THEREFORE FILING THIS REPORT WITH THE REDUCED DISCLOSURE FORMAT AS PERMITTED BY GENERAL INSTRUCTION H(2).

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

FILING FORMAT

This quarterly report on Form 10-Q is a combined report being filed by two separate registrants: Southwest Gas Holdings, Inc. and Southwest Gas Corporation. Except where the content clearly indicates otherwise, any reference in the report to “we,” “us” or “our” is to the holding company or the consolidated entity of Southwest Gas Holdings, Inc. and all of its subsidiaries, including Southwest Gas Corporation, which is a distinct registrant that is a wholly owned subsidiary of Southwest Gas Holdings, Inc. Information contained herein relating to any individual company is filed by such company on its own behalf. Each company makes representations only as to itself and makes no other representation whatsoever as to any other company.

Part I—Financial information in this Quarterly Report on Form 10-Q includes separate financial statements (i.e., balance sheets, statements of income, statements of comprehensive income, statements of cash flows, and statements of equity) for Southwest Gas Holdings, Inc. and Southwest Gas Corporation, in that order. The Notes to the Condensed Consolidated Financial Statements are presented on a combined basis for both entities. All Items other than Part I – Item 1 are combined for the reporting companies.

2

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

PART I - FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

SOUTHWEST GAS HOLDINGS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(Thousands of dollars, except par value)

(Unaudited)

	June 30, 2022		December 31, 2021
ASSETS
Regulated operations plant:
Gas plant	$	11,049,050	$	10,789,690
Less: accumulated depreciation	(3,496,191)		(3,397,736)
Construction work in progress	218,638		202,068
Net regulated operations plant	7,771,497		7,594,022
Other property and investments, net	1,312,701		1,316,479
Current assets:
Cash and cash equivalents	215,963		222,697
Accounts receivable, net of allowances	750,794		707,127
Accrued utility revenue	40,000		84,900
Income taxes receivable, net	19,147		16,816
Deferred purchased gas costs	354,571		291,145
Prepaid and other current assets	263,363		292,082
Total current assets	1,643,838		1,614,767
Noncurrent assets:
Goodwill	1,750,472		1,781,332
Deferred income taxes	168		121
Deferred charges and other assets	444,332		458,536
Total noncurrent assets	2,194,972		2,239,989
Total assets	$	12,923,008	$	12,765,257
CAPITALIZATION AND LIABILITIES
Capitalization:
Common stock, $1 par (authorized - 120,000,000 shares; issued and outstanding - 67,003,792 and 60,422,081 shares)	$	68,634	$	62,052
Additional paid-in capital	2,279,493		1,824,216
Accumulated other comprehensive loss, net	(45,528)		(46,761)
Retained earnings	1,156,253		1,114,313
Total equity	3,458,852		2,953,820
Redeemable noncontrolling interests	122,656		196,717
Long-term debt, less current maturities	4,588,454		4,115,684
Total capitalization	8,169,962		7,266,221
Current liabilities:
Current maturities of long-term debt	41,276		297,324
Short-term debt	1,462,747		1,909,000
Accounts payable	306,753		353,365
Customer deposits	53,991		59,327
Income taxes payable, net	1,725		6,734
Accrued general taxes	55,883		53,473
Accrued interest	35,697		30,964
Deferred purchased gas costs	4,986		5,736
Other current liabilities	387,359		396,126
Total current liabilities	2,350,417		3,112,049
Deferred income taxes and other credits:
Deferred income taxes and investment tax credits, net	785,258		768,868
Accumulated removal costs	494,554		480,583
Other deferred credits and other long-term liabilities	1,122,817		1,137,536
Total deferred income taxes and other credits	2,402,629		2,386,987
Total capitalization and liabilities	$	12,923,008	$	12,765,257

The accompanying notes are an integral part of these statements.

3

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

SOUTHWEST GAS HOLDINGS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(In thousands, except per share amounts)

(Unaudited)

	Three Months Ended June 30,				Six Months Ended June 30,				Twelve Months Ended June 30,
	2022		2021		2022		2021		2022		2021
Operating revenues:
Regulated operations revenues	$	440,030	$	292,796	$	1,183,562	$	814,728	$	1,890,624	$	1,400,052
Utility infrastructure services revenues	706,090		528,625		1,229,967		892,600		2,496,028		2,012,582
Total operating revenues	1,146,120		821,421		2,413,529		1,707,328		4,386,652		3,412,634
Operating expenses:
Net cost of gas sold	147,860		76,496		446,778		232,517		645,168		347,060
Operations and maintenance	175,791		104,833		325,094		211,523		586,717		416,439
Depreciation and amortization	108,010		82,848		230,656		176,290		425,407		343,447
Taxes other than income taxes	22,606		19,338		47,422		40,025		87,740		71,765
Utility infrastructure services expenses	646,193		478,640		1,149,425		814,254		2,290,638		1,794,145
Total operating expenses	1,100,460		762,155		2,199,375		1,474,609		4,035,670		2,972,856
Operating income	45,660		59,266		214,154		232,719		350,982		439,778
Other income and (expenses):
Net interest deductions	(53,206)		(25,939)		(101,569)		(49,903)		(170,864)		(106,550)
Other income (deductions)	(2,835)		(1,311)		(1,591)		(863)		(4,227)		5,193
Total other income and (expenses)	(56,041)		(27,250)		(103,160)		(50,766)		(175,091)		(101,357)
Income (loss) before income taxes	(10,381)		32,016		110,994		181,953		175,891		338,421
Income tax expense (benefit)	(4,300)		5,542		19,825		36,634		22,839		67,003
Net income (loss)	(6,081)		26,474		91,169		145,319		153,052		271,418
Net income attributable to noncontrolling interests	494		1,355		1,566		2,907		5,082		7,189
Net income (loss) attributable to Southwest Gas Holdings, Inc.	$	(6,575)	$	25,119	$	89,603	$	142,412	$	147,970	$	264,229
Earnings (loss) per share:
Basic	$	(0.10)	$	0.43	$	1.40	$	2.45	$	2.39	$	4.61
Diluted	$	(0.10)	$	0.43	$	1.40	$	2.45	$	2.38	$	4.60
Weighted average shares:
Basic	67,045		58,607		63,909		58,106		62,022		57,348
Diluted	67,190		58,710		64,041		58,197		62,157		57,440

The accompanying notes are an integral part of these statements.

4

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

SOUTHWEST GAS HOLDINGS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Thousands of dollars)

(Unaudited)

	Three Months Ended June 30,				Six Months Ended June 30,				Twelve Months Ended June 30,
	2022		2021		2022		2021		2022		2021
Net income (loss)	$	(6,081)	$	26,474	$	91,169	$	145,319	$	153,052	$	271,418
Other comprehensive income (loss), net of tax
Defined benefit pension plans:
Net actuarial gain (loss)	—		—		—		—		44,974		(43,730)
Amortization of prior service cost	33		182		66		364		431		802
Amortization of net actuarial loss	6,615		8,472		13,231		16,946		30,179		31,322
Regulatory adjustment	(5,524)		(7,277)		(11,047)		(14,554)		(63,520)		3,856
Net defined benefit pension plans	1,124		1,377		2,250		2,756		12,064		(7,750)
Forward-starting interest rate swaps (“FSIRS”):
Amounts reclassified into net income	—		414		416		827		1,241		2,023
Net forward-starting interest rate swaps	—		414		416		827		1,241		2,023
Foreign currency translation adjustments	(2,680)		909		(1,433)		1,732		(3,145)		5,656
Total other comprehensive income (loss), net of tax	(1,556)		2,700		1,233		5,315		10,160		(71)
Comprehensive income (loss)	(7,637)		29,174		92,402		150,634		163,212		271,347
Comprehensive income attributable to noncontrolling interests	494		1,355		1,566		2,907		5,082		7,189
Comprehensive income (loss) attributable to Southwest Gas Holdings, Inc.	$	(8,131)	$	27,819	$	90,836	$	147,727	$	158,130	$	264,158

The accompanying notes are an integral part of these statements.

5

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

SOUTHWEST GAS HOLDINGS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Thousands of dollars)

(Unaudited)

	Six Months Ended June 30,				Twelve Months Ended June 30,
	2022		2021		2022		2021
CASH FLOW FROM OPERATING ACTIVITIES:
Net income	$	91,169	$	145,319	$	153,052	$	271,418
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	230,656		176,290		425,407		343,447
Deferred income taxes	30,163		44,178		47,197		63,774
Changes in current assets and liabilities:
Accounts receivable, net of allowances	(42,212)		10,005		(103,771)		(29,021)
Accrued utility revenue	44,900		43,900		(1,500)		(2,700)
Deferred purchased gas costs	(64,176)		(287,687)		(120,217)		(305,043)
Accounts payable	(33,356)		(41,075)		58,145		(1,571)
Accrued taxes	(5,023)		(3,164)		(8,584)		2,988
Other current assets and liabilities	16,480		(31,928)		(40,801)		(3,039)
Gains on sale of property and equipment	(3,475)		(4,033)		(6,348)		(5,572)
Changes in undistributed stock compensation	7,036		5,736		10,594		8,518
Equity AFUDC	(575)		—		(575)		(2,543)
Changes in deferred charges and other assets	13,736		(11,171)		11,366		(35,494)
Changes in other liabilities and deferred credits	(21,705)		(45,013)		(50,321)		(52,865)
Net cash provided by operating activities	263,618		1,357		373,644		252,297
CASH FLOW FROM INVESTING ACTIVITIES:
Construction expenditures and property additions	(367,932)		(338,049)		(745,509)		(739,719)
Acquisition of businesses, net of cash acquired	(18,809)		—		(2,373,069)		—
Changes in customer advances	17,051		7,507		25,518		17,442
Other	3,905		9,159		13,002		13,367
Net cash used in investing activities	(365,785)		(321,383)		(3,080,058)		(708,910)
CASH FLOW FROM FINANCING ACTIVITIES:
Issuance of common stock, net	456,280		121,302		548,619		205,049
Centuri distribution to redeemable noncontrolling interest	(39,649)		—		(39,649)		—
Dividends paid	(77,419)		(67,130)		(148,511)		(131,189)
Issuance of long-term debt, net	759,602		82,245		2,338,053		124,319
Retirement of long-term debt	(412,263)		(60,500)		(804,427)		(299,370)
Change in credit facility and commercial paper	(130,000)		—		(150,000)		150,000
Change in short-term debt	(446,253)		211,000		(705,253)		260,000
Issuance of short-term debt	—		—		1,850,000		—
Withholding remittance - share-based compensation	(2,089)		(1,243)		(2,110)		(1,243)
Other	(12,811)		(1,623)		(11,917)		(3,565)
Net cash provided by financing activities	95,398		284,051		2,874,805		304,001
Effects of currency translation on cash and cash equivalents	35		188		7		586
Change in cash and cash equivalents	(6,734)		(35,787)		168,398		(152,026)
Cash and cash equivalents at beginning of period	222,697		83,352		47,565		199,591
Cash and cash equivalents at end of period	$	215,963	$	47,565	$	215,963	$	47,565
SUPPLEMENTAL INFORMATION:
Interest paid, net of amounts capitalized	$	92,297	$	47,475	$	149,174	$	101,227
Income taxes paid (received), net	$	8,300	$	6,659	$	5,849	$	15,118

The accompanying notes are an integral part of these statements.

6

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

SOUTHWEST GAS HOLDINGS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY

(In thousands, except per share amounts)

(Unaudited)

			Three Months Ended June 30,				Six Months Ended June 30,
			2022		2021		2022		2021
Common stock shares
	Beginning balances		66,849		57,995		60,422		57,193
		Common stock issuances	155		1,093		6,582		1,895
	Ending balances		67,004		59,088		67,004		59,088
Common stock amount
	Beginning balances		$	68,479	$	59,625	$	62,052	$	58,823
		Common stock issuances	155		1,093		6,582		1,895
	Ending balances		68,634		60,718		68,634		60,718
Additional paid-in capital
	Beginning balances		2,273,837		1,660,108		1,824,216		1,609,155
		Common stock issuances	5,656		73,464		455,277		124,417
	Ending balances		2,279,493		1,733,572		2,279,493		1,733,572
Accumulated other comprehensive loss
	Beginning balances		(43,972)		(58,388)		(46,761)		(61,003)
		Foreign currency exchange translation adjustment	(2,680)		909		(1,433)		1,732
		Net actuarial gain arising during period, less amortization of unamortized benefit plan cost, net of tax	1,124		1,377		2,250		2,756
		FSIRS amounts reclassified to net income, net of tax	—		414		416		827
	Ending balances		(45,528)		(55,688)		(45,528)		(55,688)
Retained earnings
	Beginning balances		1,190,738		1,112,377		1,114,313		1,067,978
		Net income (loss)	(6,575)		25,119		89,603		142,412
		Dividends declared	(41,732)		(35,329)		(83,641)		(70,205)
		Redemption value adjustments	13,822		6,112		35,978		(31,906)
	Ending balances		1,156,253		1,108,279		1,156,253		1,108,279
Total equity ending balances			$	3,458,852	$	2,846,881	$	3,458,852	$	2,846,881
Dividends declared per common share			$	0.62	$	0.595	$	1.24	$	1.19

The accompanying notes are an integral part of these statements.

7

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

SOUTHWEST GAS CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(Thousands of dollars)

(Unaudited)

	June 30, 2022		December 31, 2021
ASSETS
Regulated operations plant:
Gas plant	$	9,137,313	$	8,901,575
Less: accumulated depreciation	(2,613,096)		(2,538,508)
Construction work in progress	193,269		183,485
Net regulated operations plant	6,717,486		6,546,552
Other property and investments, net	146,599		153,093
Current assets:
Cash and cash equivalents	102,143		38,691
Accounts receivable, net of allowance	141,820		169,666
Accrued utility revenue	40,000		84,900
Income taxes receivable, net	6,665		7,826
Deferred purchased gas costs	354,571		291,145
Receivable from parent	—		1,031
Prepaid and other current assets	207,545		242,243
Total current assets	852,744		835,502
Noncurrent assets:
Goodwill	10,095		10,095
Deferred charges and other assets	388,054		405,021
Total noncurrent assets	398,149		415,116
Total assets	$	8,114,978	$	7,950,263
CAPITALIZATION AND LIABILITIES
Capitalization:
Common stock	$	49,112	$	49,112
Additional paid-in capital	1,622,006		1,618,911
Accumulated other comprehensive loss, net	(44,247)		(46,913)
Retained earnings	952,725		906,827
Total equity	2,579,596		2,527,937
Long-term debt, less current maturities	2,904,099		2,440,603
Total capitalization	5,483,695		4,968,540
Current liabilities:
Current maturities of long-term debt	—		275,000
Short-term debt	225,000		250,000
Accounts payable	143,569		234,070
Customer deposits	50,925		56,127
Accrued general taxes	51,722		53,064
Accrued interest	26,942		22,926
Payable to parent	330		—
Other current liabilities	162,151		146,422
Total current liabilities	660,639		1,037,609
Deferred income taxes and other credits:
Deferred income taxes and investment tax credits, net	676,294		638,828
Accumulated removal costs	437,000		424,000
Other deferred credits and other long-term liabilities	857,350		881,286
Total deferred income taxes and other credits	1,970,644		1,944,114
Total capitalization and liabilities	$	8,114,978	$	7,950,263

The accompanying notes are an integral part of these statements.

8

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

SOUTHWEST GAS CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(Thousands of dollars)

(Unaudited)

	Three Months Ended June 30,				Six Months Ended June 30,				Twelve Months Ended June 30,
	2022		2021		2022		2021		2022		2021
Regulated operations revenues	$	377,942	$	292,796	$	1,054,481	$	814,728	$	1,761,543	$	1,400,052
Operating expenses:
Net cost of gas sold	146,654		76,496		443,775		232,517		642,165		347,060
Operations and maintenance	127,811		103,137		247,447		209,272		476,725		413,246
Depreciation and amortization	55,930		57,631		128,044		126,329		255,113		243,701
Taxes other than income taxes	20,098		19,338		41,750		40,025		82,068		71,765
Total operating expenses	350,493		256,602		861,016		608,143		1,456,071		1,075,772
Operating income	27,449		36,194		193,465		206,585		305,472		324,280
Other income and (expenses):
Net interest deductions	(28,633)		(24,175)		(55,243)		(46,341)		(106,462)		(98,440)
Other income (deductions)	(3,433)		(1,165)		(2,118)		(615)		(6,062)		5,493
Total other income and (expenses)	(32,066)		(25,340)		(57,361)		(46,956)		(112,524)		(92,947)
Income (loss) before income taxes	(4,617)		10,854		136,104		159,629		192,948		231,333
Income tax expense (benefit)	(2,351)		(559)		26,575		29,501		26,412		37,628
Net income (loss)	$	(2,266)	$	11,413	$	109,529	$	130,128	$	166,536	$	193,705

The accompanying notes are an integral part of these statements.

9

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

SOUTHWEST GAS CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Thousands of dollars)

(Unaudited)

	Three Months Ended June 30,				Six Months Ended June 30,				Twelve Months Ended June 30,
	2022		2021		2022		2021		2022		2021
Net income (loss)	$	(2,266)	$	11,413	$	109,529	$	130,128	$	166,536	$	193,705
Other comprehensive income (loss), net of tax
Defined benefit pension plans:
Net actuarial gain (loss)	—		—		—		—		44,974		(43,730)
Amortization of prior service cost	33		182		66		364		431		802
Amortization of net actuarial loss	6,615		8,472		13,231		16,946		30,179		31,322
Regulatory adjustment	(5,524)		(7,277)		(11,047)		(14,554)		(63,520)		3,856
Net defined benefit pension plans	1,124		1,377		2,250		2,756		12,064		(7,750)
Forward-starting interest rate swaps (“FSIRS”):
Amounts reclassified into net income	—		414		416		827		1,241		2,023
Net forward-starting interest rate swaps	—		414		416		827		1,241		2,023
Total other comprehensive income (loss), net of tax	1,124		1,791		2,666		3,583		13,305		(5,727)
Comprehensive income (loss)	$	(1,142)	$	13,204	$	112,195	$	133,711	$	179,841	$	187,978

The accompanying notes are an integral part of these statements.

10

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

SOUTHWEST GAS CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Thousands of dollars)

(Unaudited)

	Six Months Ended June 30,				Twelve Months Ended June 30,
	2022		2021		2022		2021
CASH FLOW FROM OPERATING ACTIVITIES:
Net income	$	109,529	$	130,128	$	166,536	$	193,705
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	128,044		126,329		255,113		243,701
Deferred income taxes	36,624		38,178		51,683		64,989
Changes in current assets and liabilities:
Accounts receivable, net of allowance	27,846		28,018		(22,978)		(25,096)
Accrued utility revenue	44,900		43,900		(1,500)		(2,700)
Deferred purchased gas costs	(63,426)		(287,687)		(119,467)		(305,043)
Accounts payable	(72,201)		(56,518)		42,081		6,812
Accrued taxes	(181)		2,401		5,171		(16,872)
Other current assets and liabilities	46,730		4,549		(28,090)		(18,418)
Gain on sale of property	(1,503)		—		(1,503)		—
Changes in undistributed stock compensation	4,459		4,159		6,692		5,959
Equity AFUDC	(157)		—		(157)		(2,543)
Changes in deferred charges and other assets	2,529		(17,540)		(8,674)		(48,142)
Changes in other liabilities and deferred credits	(22,230)		(45,309)		(49,307)		(55,272)
Net cash provided by (used in) operating activities	240,963		(29,392)		295,600		41,080
CASH FLOW FROM INVESTING ACTIVITIES:
Construction expenditures and property additions	(293,197)		(276,109)		(619,071)		(613,824)
Changes in customer advances	17,051		7,507		25,517		17,442
Other	(896)		6		(934)		677
Net cash used in investing activities	(277,042)		(268,596)		(594,488)		(595,705)
CASH FLOW FROM FINANCING ACTIVITIES:
Contributions from parent	—		115,641		86,942		194,063
Dividends paid	(60,200)		(53,500)		(118,100)		(106,900)
Issuance of long-term debt, net	593,862		—		891,180		—
Retirement of long-term debt	(275,000)		—		(275,000)		(125,000)
Change in credit facility and commercial paper	(130,000)		—		(150,000)		150,000
Change in short-term debt	(25,000)		234,000		(66,000)		291,000
Withholding remittance - share-based compensation	(1,996)		(1,242)		(2,017)		(1,242)
Other	(2,135)		(263)		(3,692)		(362)
Net cash provided by financing activities	99,531		294,636		363,313		401,559
Change in cash and cash equivalents	63,452		(3,352)		64,425		(153,066)
Cash and cash equivalents at beginning of period	38,691		41,070		37,718		190,784
Cash and cash equivalents at end of period	$	102,143	$	37,718	$	102,143	$	37,718
SUPPLEMENTAL INFORMATION:
Interest paid, net of amounts capitalized	$	51,312	$	44,834	$	96,718	$	94,984
Income taxes paid (received), net	$	5	$	—	$	(13,524)	$	3,359

The accompanying notes are an integral part of these statements.

11

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

SOUTHWEST GAS CORPORATION AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY

(In thousands)

(Unaudited)

			Three Months Ended June 30,				Six Months Ended June 30,
			2022		2021		2022		2021
Common stock shares
	Beginning and ending balances		47,482		47,482		47,482		47,482
Common stock amount
	Beginning and ending balances		$	49,112	$	49,112	$	49,112	$	49,112
Additional paid-in capital
	Beginning balances		1,620,616		1,458,344		1,618,911		1,410,345
		Share-based compensation	1,390		1,418		3,095		3,433
		Contributions from Southwest Gas Holdings, Inc.	—		69,657		—		115,641
	Ending balances		1,622,006		1,529,419		1,622,006		1,529,419
Accumulated other comprehensive loss
	Beginning balances		(45,371)		(59,343)		(46,913)		(61,135)
		Net actuarial gain arising during period, less amortization of unamortized benefit plan cost, net of tax	1,124		1,377		2,250		2,756
		FSIRS amounts reclassified to net income, net of tax	—		414		416		827
	Ending balances		(44,247)		(57,552)		(44,247)		(57,552)
Retained earnings
	Beginning balances		987,177		926,011		906,827		835,146
		Net income (loss)	(2,266)		11,413		109,529		130,128
		Share-based compensation	(186)		(167)		(631)		(517)
		Dividends declared to Southwest Gas Holdings, Inc.	(32,000)		(28,500)		(63,000)		(56,000)
	Ending balances		952,725		908,757		952,725		908,757
Total Southwest Gas Corporation equity ending balances			$	2,579,596	$	2,429,736	$	2,579,596	$	2,429,736

The accompanying notes are an integral part of these statements.

12

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Note 1 – Background, Organization, and Summary of Significant Accounting Policies

Nature of Operations. Southwest Gas Holdings, Inc. (together with its subsidiaries, the “Company”) is a holding company, owning all of the shares of common stock of Southwest Gas Corporation (“Southwest” or the “natural gas distribution” segment), all of the shares of common stock of Centuri Group, Inc. (“Centuri,” or the “utility infrastructure services” segment), and all of the shares of common stock of MountainWest Pipelines Holding Company (“MountainWest,” or the “pipeline and storage” segment).

The Company completed the acquisition of Dominion Energy Questar Pipeline, LLC and related entities (“Questar Pipelines”) in December 2021. Following the completion of the acquisition, the Company formed MountainWest which owns all of the membership interests in Questar Pipelines. In April 2022, the Company completed a general rebranding of the Questar Pipelines entities under the MountainWest name. The acquired operations further diversify the Company’s business in the midstream sector, with an expansion of interstate natural gas pipelines and underground storage services, primarily composed of regulated operations under the jurisdiction of the Federal Energy Regulatory Commission (the “FERC”), thereby expanding natural gas transportation services into Utah, Wyoming, and Colorado. See Note 8 - Business Acquisitions for more information.

Southwest is engaged in the business of purchasing, distributing, and transporting natural gas for customers in portions of Arizona, Nevada, and California. Public utility rates, practices, facilities, and service territories of Southwest are subject to regulatory oversight. The timing and amount of rate relief can materially impact results of operations. Natural gas purchases and the timing of related recoveries can materially impact liquidity. Results for the natural gas distribution segment are higher during winter periods due to the seasonality incorporated in its regulatory rate structures.

Centuri is a strategic utility infrastructure services company dedicated to partnering with North America’s gas and electric providers to build and maintain the energy network that powers millions of homes across the United States (“U.S.”) and Canada. Centuri derives revenue primarily from installation, replacement, repair, and maintenance of energy networks. Centuri operates in the U.S., primarily as NPL, Neuco, Linetec, and Riggs Distler, and in Canada, primarily as NPL Canada. Utility infrastructure services activity is seasonal in many of Centuri’s operating areas. Peak periods are the summer and fall months in colder climate areas, such as the northeastern and midwestern U.S. and in Canada. In warmer climate areas, such as the southwestern and southeastern U.S., utility infrastructure services activity continues year round.

Centuri completed the acquisition of Drum Parent LLC (“Drum”), including Drum’s most significant operating subsidiary, Riggs Distler, in August 2021, thereby expanding Centuri’s electric infrastructure services footprint in the northeast and mid-Atlantic regions of the U.S. See Note 8 - Business Acquisitions for more information.

In March 2022, the Company announced that its Board of Directors (the “Board”) had determined to separate Centuri from the Company and authorized management to complete the separation within nine to twelve months. Initially it was contemplated that the Centuri separation would take the form of a spin-off. Then, in April 2022, as a result of interest in the Company well in excess of an earlier tender offer to other shareholders by an activist stockholder (affiliates of Carl C. Icahn), the Board authorized the review of a full range of strategic alternatives to maximize stockholder value. As part of this process, a strategic transactions committee of the Board (the “Strategic Transactions Committee”), consisting entirely of independent directors, has been evaluating a sale of the Company, as well as a range of alternatives, including, but not limited to, a separate sale of its business units and/or pursuing the spin-off of Centuri (collectively, the “Strategic Review”). On August 3, 2022, the Company announced that the Board had unanimously determined that the best path forward to maximize value for all stockholders is to (i) focus on the strategic plan and conclude the strategic review process for Southwest Gas Holdings, Inc. and Southwest Gas Corporation; (ii) continue to review strategic alternatives for MountainWest; and (iii) continue to review strategic alternatives for Centuri, including a sale or spin-off of Centuri.

On May 6, 2022, the Company entered into a Cooperation Agreement (the “Cooperation Agreement”) with Carl C. Icahn and the persons and entities referenced therein (collectively, the “Icahn Group”). In accordance with the Cooperation Agreement, among other things, John P. Hester, President and Chief Executive Officer of the Company and Southwest, retired from his positions with the Company and Southwest and resigned from the Board. Thereafter, Karen S. Haller, the Company’s former Executive Vice President/Chief Legal and Administrative Officer, was appointed President and Chief Executive Officer of the Company and Chief Executive Officer of Southwest, and was appointed as a member of the Board effective immediately following the completion of the Company’s 2022 annual meeting of stockholders (the “2022 Annual Meeting”). Justin L. Brown, formerly Southwest’s Senior Vice President/General Counsel, was appointed as President of Southwest.

In addition, pursuant to the Cooperation Agreement, the Company agreed to appoint three new directors, Andrew W. Evans, H. Russell Frisby, Jr., and Henry P. Linginfelter (collectively, the “Icahn Designees”), to the Board, which became effective immediately following the 2022 Annual Meeting. Also pursuant to the Cooperation Agreement, on May 27, 2022, the Icahn group informed the Company that it would cause Mr. Frisby to resign from the Board and requested that Andrew J. Teno be

13

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

appointed to the Board to fill the vacancy created by Mr. Frisby’s resignation. As a result, on May 27, Mr. Frisby resigned from the Board, effective immediately, and the Board appointed Mr. Teno to fill the vacancy created by Mr. Frisby’s resignation, effective immediately. The Icahn Group’s ability to designate directors to the Board is subject to certain ownership thresholds. Consistent with the May 6, 2022 Cooperation Agreement with the Icahn Group, the Company expects José A. Cárdenas to step down from the Board in the near future, and a new director will be appointed.

The Cooperation Agreement required the Board expand the Strategic Transactions Committee from three directors to six directors, comprised of the existing members of the Strategic Transactions Committee in addition to the three Icahn Designees. Also, as the Icahn Group has the ability to designate at least three members of the Board, such individuals are to be included on the Strategic Transactions Committee. If the Icahn Group may only designate two members of the Board, then both would serve on the Strategic Transactions Committee.

On May 9, 2022, the Company also entered into Amendment No. 1 to the Rights Agreement dated October 10, 2021 (the “Original Rights Agreement” and as amended, the “Amended Rights Agreement”), to increase the triggering percentage from 10% to 24.9% pursuant to the terms of the Cooperation Agreement and permit the subsequent consummation of the Offer (as defined below). See details in the Company’s and Southwest’s Annual Report on Form 10-K for the fiscal year ended December 31, 2021 (the “2021 Form 10-K”) regarding the Original Rights Agreement, as well as Note 4 – Common Stock in this current report on Form 10-Q.

In addition, pursuant to the Cooperation Agreement, the Icahn Group is permitted to acquire up to 24.9% of the shares of the Company, which would include shares as part of an updated tender offer of $82.50 per share, with the updated tender offer expiring on May 20, 2022. An earlier civil suit (initiated in November 2021) by Icahn entities against the Company and certain directors and officers of the Company was subject to a stipulation of dismissal as part of the Cooperation Agreement. The Cooperation Agreement also provides for the reimbursement by the Company of certain out-of-pocket third-party expenses, including certain legal fees, incurred by the Icahn Group.

Basis of Presentation. The condensed consolidated financial statements of Southwest Gas Holdings, Inc. and subsidiaries and Southwest included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). The year-end 2021 condensed balance sheet data was derived from audited financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) have been condensed or omitted pursuant to such rules and regulations. No substantive change has occurred with regard to the Company’s business segments on the whole during the recently completed quarter.

The preparation of the condensed consolidated financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. In the opinion of management, all adjustments, consisting of normal recurring items and estimates necessary for a fair depiction of results for the interim periods, have been made.

These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the 2021 Annual Report to Stockholders, which is incorporated by reference into the 2021 Form 10-K.

Other Property and Investments. Other property and investments on Southwest’s and the Company’s Condensed Consolidated Balance Sheets includes:

(Thousands of dollars)	June 30, 2022		December 31, 2021
Net cash surrender value of COLI policies	$	142,819	$	149,947
Other property	3,780		3,146
Total Southwest Gas Corporation	146,599		153,093
Non-regulated property, equipment, and intangibles	1,678,683		1,616,392
Non-regulated accumulated provision for depreciation and amortization	(569,630)		(512,343)
Other property and investments	57,049		59,337
Total Southwest Gas Holdings, Inc.	$	1,312,701	$	1,316,479

Included in the table above are the net cash surrender values of company-owned life insurance (“COLI”) policies. These life insurance policies on members of management and other key employees are used by Southwest to indemnify itself against the loss of talent, expertise, and knowledge, as well as to provide indirect funding for certain nonqualified benefit plans. The term

14

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

non-regulated in regard to assets and related balances in the table above is in reference to the non-rate regulated operations of Centuri, and to a more limited extent, certain assets of MountainWest.

Cash and Cash Equivalents.  Cash and cash equivalents include money market fund investments totaling approximately $77 million and $97 million, for Southwest and the Company, respectively, at June 30, 2022, and $20 million for the Company as of December 31, 2021. The balance for Southwest as of December 31, 2021 was insignificant. These investments fall within Level 2 of the fair value hierarchy, due to the asset valuation methods used by money market funds.

Non-cash investing activities for the Company and Southwest include capital expenditures that were not yet paid, thereby remaining in accounts payable, which declined by approximately $11.6 million and $18.3 million, respectively, during the six months ended June 30, 2022, and increased $6.5 million and $6.6 million, respectively, during the twelve months ended June 30, 2022.

Accounts Receivable, net of allowances. Following an earlier moratorium on account disconnections amidst the COVID-19 environment, account collection efforts resumed in 2021 in all jurisdictions in which Southwest operates. Ultimately, some accounts may not be collected, and if so, would be written off. Estimates as to collectibility are made on an ongoing basis. However, Southwest continues to actively work with customers experiencing financial hardship by means of flexible payment options and partnering with assistance agencies. The cost of gas included in customer rates also influences account balances at each reporting date.

Deferred Purchased Gas Costs. The various regulatory commissions have established procedures to enable the rate-regulated companies to adjust billing rates for changes in the cost of natural gas purchased. The difference between the current cost of gas purchased and the cost of gas recovered in billed rates is deferred. Generally, these deferred amounts are recovered or refunded within one year.

Prepaid and other current assets. Prepaid and other current assets for Southwest include, among other things, materials and operating supplies of $70.2 million at June 30, 2022 and $62.9 million at December 31, 2021 (carried at weighted average cost). For the Company, there were materials and operating supplies of $74.5 million and $67.4 million at June 30, 2022 and December 31, 2021, respectively, which included amounts for MountainWest. Also included in the balance for both Southwest and the Company was $10.2 million and $52 million as of June 30, 2022 and December 31, 2021, respectively, in accrued purchased gas cost.

Goodwill. Goodwill is assessed as of October 1st each year for impairment, or more frequently, if circumstances indicate an impairment to the carrying value of goodwill may have occurred. Management of the Company and Southwest considered its reporting units and segments, determining that they remained consistent between periods presented below, and that no change was necessary with regard to the level at which goodwill is assessed for impairment. The acquisition of MountainWest resulted in a new reportable segment which is assessed for impairment beginning in 2022. Since December 31, 2021, management qualitatively assessed whether events during the first six months of 2022 may have resulted in conditions whereby the carrying value of goodwill was higher than its fair value, which if the case, could be an indication of a permanent impairment. Through this assessment, no such condition was believed to have existed and therefore, no impairment was deemed to have occurred. However, there can be no assurances that future assessments of goodwill will not result in an impairment, and various factors, including the results of the continuing Strategic Review related to Centuri and MountainWest, or changes in economic conditions, governmental monetary policies, interest rates, or others, on their own or in combination with the undertakings of the Strategic Review, could result in the fair value of the related reporting units being lower than their carrying value. See also Note 8 - Business Acquisitions. Goodwill in the Natural Gas Distribution operations of Southwest, and across all operations of the Company, is included in their respective Condensed Consolidated Balance Sheets as follows:

(Thousands of dollars)	Natural Gas Distribution		Utility Infrastructure Services		Pipeline and Storage		Total Company
December 31, 2021	$	10,095	$	785,058	$	986,179	$	1,781,332
Measurement-period adjustments from Riggs Distler acquisition (a)	—		(906)				(906)
Measurement-period adjustments from MountainWest acquisition (a)	—		—		(28,178)		(28,178)
Foreign currency translation adjustment	—		(1,776)		—		(1,776)
June 30, 2022	$	10,095	$	782,376	$	958,001	$	1,750,472

(a) See Note 8 - Business Acquisitions for details regarding measurement-period adjustments.

15

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Other Current Liabilities. Management recognizes in its balance sheets various liabilities that are expected to be settled through future cash payment within the next twelve months, including amounts payable under regulatory mechanisms, customary accrued expenses for employee compensation and benefits, declared but unpaid dividends, and miscellaneous other accrued liabilities. Other current liabilities for the Company include $41.5 million and $36 million of dividends declared as of June 30, 2022 and December 31, 2021, respectively.

Other Income (Deductions). The following table provides the composition of significant items included in Other income (deductions) in Southwest’s and the Company’s Condensed Consolidated Statements of Income:

	Three Months Ended June 30,				Six Months Ended June 30,				Twelve Months Ended June 30,
(Thousands of dollars)	2022		2021		2022		2021		2022		2021
Southwest Gas Corporation:
Change in COLI policies	$	(5,200)	$	3,100	$	(7,200)	$	5,800	$	(4,200)	$	18,500
Interest income	3,198		1,231		5,999		1,947		9,165		4,160
Equity AFUDC	81		(981)		157		—		157		2,543
Other components of net periodic benefit cost	(187)		(3,505)		(375)		(7,010)		(7,386)		(17,021)
Miscellaneous income and (expense)	(1,325)		(1,010)		(699)		(1,352)		(3,798)		(2,689)
Southwest Gas Corporation - total other income (deductions)	(3,433)		(1,165)		(2,118)		(615)		(6,062)		5,493
Centuri, MountainWest, and Southwest Gas Holdings, Inc.:
Foreign transaction gain (loss)	214		(9)		217		(12)		207		(12)
Equity AFUDC	236		—		418		—		418		—
Equity in earnings of unconsolidated investments	728		109		1,243		101		1,368		156
Miscellaneous income and (expense)	(580)		(246)		(1,351)		(337)		(158)		(444)
Southwest Gas Holdings, Inc. - total other income (deductions)	$	(2,835)	$	(1,311)	$	(1,591)	$	(863)	$	(4,227)	$	5,193

Included in the table above is the change in cash surrender values of COLI policies (including net death benefits recognized). Current tax regulations provide for tax-free treatment of life insurance (death benefit) proceeds. Therefore, changes in the cash surrender values of COLI policies, as they progress towards the ultimate death benefits, are also recorded without tax consequences. Refer also to the discussion of Other Property and Investments above and to Note 2 – Components of Net Periodic Benefit Cost.

Redeemable Noncontrolling Interests. In connection with the acquisition of Linetec in November 2018, the previous owner retained a 20% equity interest in that entity, the reduction of which is subject to certain rights based on the passage of time or upon the occurrence of certain triggering events. Effective January 2022, the Company, through Centuri, had the right, but not the obligation, to purchase at fair value (subject to a floor) a portion of the interest held by the previous owner, and in incremental amounts each year thereafter. In March 2022, the parties agreed to a partial redemption based on these provisions, and as a result, Centuri paid $39.6 million to the previous owner of Linetec for a 5% equity interest in Linetec, thereby reducing the balance continuing to be redeemable to 15% under the terms of the original agreement. In order to fund the redemption, Southwest Gas Holdings, Inc. contributed capital to Centuri.

Certain members of Riggs Distler management have a 1.42% interest in Drum, which is redeemable, subject to certain rights based on the passage of time or upon the occurrence of certain triggering events.

Significant changes in the value of the redeemable noncontrolling interests, above a floor determined at the establishment date, are recognized as they occur, and the carrying value is adjusted as necessary at each reporting date. The fair value is estimated using a market approach that utilizes certain financial metrics from guideline public companies of similar industry and operating characteristics. Based on the fair value model employed, the estimated redemption value of the Linetec redeemable noncontrolling interest decreased by approximately $36 million during the six months ended June 30, 2022. Adjustment to the redemption value also impacts retained earnings, as reflected in the Company’s Condensed Consolidated Statement of Equity, but does not impact net income. The following depicts changes to the balances of the redeemable noncontrolling interests:

16

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

(Thousands of dollars):	Linetec		Drum		Total
Balance, December 31, 2021	$	184,148	$	12,569	$	196,717
Net income (loss) attributable to redeemable noncontrolling interests	1,576		(10)		1,566
Redemption value adjustments	(35,978)		—		(35,978)
Redemption of equity interest from noncontrolling party	(39,649)		—		(39,649)
Balance, June 30, 2022	$	110,097	$	12,559	$	122,656

Earnings Per Share. Basic earnings per share (“EPS”) in each period of this report were calculated by dividing net income attributable to Southwest Gas Holdings, Inc. by the weighted-average number of shares during those periods. Diluted EPS includes additional weighted-average common stock equivalents (performance shares and restricted stock units). Unless otherwise noted, the term “Earnings Per Share” refers to Basic EPS. A reconciliation of the denominator used in Basic and Diluted EPS calculations is shown in the following table:

	Three Months Ended June 30,		Six Months Ended June 30,		Twelve Months Ended June 30,
(In thousands)	2022	2021	2022	2021	2022	2021
Weighted average basic shares	67,045	58,607	63,909	58,106	62,022	57,348
Effect of dilutive securities:
Restricted stock units (1)	145	103	132	91	135	92
Weighted average diluted shares	67,190	58,710	64,041	58,197	62,157	57,440

(1) The number of securities included 136,000 and 95,000 performance shares during the three months ending June 30, 2022 and 2021, 125,000 and 85,000 performance shares during the six months ending June 30, 2022 and 2021 and 124,000 and 83,000 performance shares during the twelve months ending June 30, 2022 and 2021, respectively, the total of which was derived by assuming that target performance will be achieved during the relevant performance period.

Contingencies. Southwest maintains liability insurance for various risks associated with the operation of its natural gas pipelines and facilities. In connection with these liability insurance policies, Southwest is responsible for an initial deductible or self-insured retention amount per incident, after which the insurance carriers would be responsible for amounts up to the policy limits. For the policy year August 2021 to July 2022, these liability insurance policies require Southwest to be responsible for the first $1 million (self-insured retention) of each incident plus the first $4 million in aggregate claims above its self-insured retention in the policy year. In August 2021, a natural gas pipe operated by Southwest was involved in an explosion that injured four individuals and damaged property. The explosion was caused by a leak in the pipe, and is under investigation. Individuals that were injured have each brought legal claims against Southwest and other parties. If Southwest is deemed fully or partially responsible, Southwest estimates its net exposure could be equal to the self-insured retention of $5 million (the maximum noted above). In 2021, pursuant to Accounting Standards Codification 450, Contingencies, Southwest recorded a $5 million liability related to this incident reflecting the maximum noted above; an estimate of actual loss greater than this exposure (to be covered by insurance) cannot be estimated as of the date these financial statements are issued.

Other contingencies are also recognized where appropriate, if claims are brought, or expected to be brought, against the Company or Southwest, where management expects it may settle (or be required to settle) claims in cash, or in some cases, by means of insurance indemnification. The balance of such reserves was updated for additional accruals, including in regard to a contract dispute. For that item, $6.2 million was recorded during the second quarter of 2022, based on management’s estimate of Southwest’s exposure.

As described above, the November 2021 civil suit filed by the Icahn Group, against the Company and certain officers and directors, was subject to a stipulation of dismissal with prejudice in May 2022, pursuant to the terms of the Cooperation Agreement.

On November 18, 2021, the City Pension Fund for Firefighters and Police Officers in the City of Miami Beach (“City Pension Fund”) commenced a putative class action lawsuit in the Court of Chancery for the State of Delaware on behalf of a putative class of persons who purchased the Company’s stock. The complaint was later amended on November 30, 2021. The amended complaint named the Company and the individual members of the Board as defendants. The complaint sought to assert breach of fiduciary duty claims, alleging that the Board’s recommendation that stockholders reject Icahn’s Offer to purchase shares of the Company’s common stock omitted material information about the Company’s financial analysis; and sought to have the Board approve Icahn’s slate of nominees as “continuing directors” under certain of the Company’s debt instruments. In March 2022, the City Pension Fund filed a motion for summary judgment on its claim; however, in April 2022, the City Pension Fund

17

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

filed a notice of withdrawal of its motion for summary judgment. The Company believes that the claims lack merit and intends to vigorously defend against them.

Recent Accounting Standards Updates.

Accounting pronouncements effective or adopted in 2022:

In March 2020, the Financial Accounting Standards Board (the “FASB”) issued ASU 2020-04 “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” The update provides optional guidance for a limited time to ease the potential burden in accounting for, or recognizing the effects of, reference rate reform on financial reporting, including when modifying a contract (during the eligibility period covered by the update to Topic 848) to replace a reference rate affected by such reform. The update applies only to contracts and hedging relationships that reference the London Interbank Offered Rate (“LIBOR”) or another rate expected to be discontinued due to reference rate reform. The guidance was eligible to be applied upon issuance on March 12, 2020, and can generally be applied through December 31, 2022, and while a proposal by the FASB has occurred to extend the optional guidance to the full tenor of LIBOR expiration dates occurring after 2022, to date, no such update has been made effective. Management will monitor the impacts this update might have on the Company’s and Southwest’s consolidated financial statements and disclosures, and will reflect such appropriately, in the event that the optional guidance is elected. Management will also monitor further FASB action, if any, in regard to the full tenor of LIBOR expiration dates. See also LIBOR discussion in Note 5 – Debt.

In August 2020, the FASB issued ASU 2020-06 “Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging— Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity.” The update, amongst other amendments, improves the guidance related to the disclosures and earnings-per-share for convertible instruments and contracts in an entity’s own equity. The Company and Southwest adopted the update in the first quarter of 2022, the impact of which was not material to the consolidated financial statements of the Company or Southwest.

18

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Note 2 – Components of Net Periodic Benefit Cost

Southwest has a noncontributory qualified retirement plan with defined benefits covering substantially all employees and a separate unfunded supplemental retirement plan (“SERP”) which is limited to officers. Southwest also provides postretirement benefits other than pensions (“PBOP”) to its qualified retirees for health care, dental, and life insurance. The defined benefit qualified retirement plan, SERP, and PBOP are not available to Southwest employees hired on or after January 1, 2022. Employees hired in 2022 or later periods are eligible for enhanced defined contributions as part of the Southwest 401(k) plan, rather than participating in the defined benefit retirement plan.

The service cost component of net periodic benefit costs included in the table below is a component of an overhead loading process associated with the cost of labor. The overhead process ultimately results in allocation of service cost to the same accounts to which productive labor is charged. As a result, service costs become components of various accounts, primarily operations and maintenance expense, net regulated operations plant, and deferred charges and other assets for both the Company and Southwest. The other components of net periodic benefit cost are reflected in Other income (deductions) on the Condensed Consolidated Statements of Income of each entity.

	Qualified Retirement Plan
	June 30,
	Three Months				Six Months				Twelve Months
	2022		2021		2022		2021		2022		2021
(Thousands of dollars)
Service cost	$	11,028	$	10,290	$	22,056	$	20,580	$	42,635	$	37,730
Interest cost	11,251		10,108		22,502		20,216		42,718		42,994
Expected return on plan assets	(19,978)		(18,088)		(39,956)		(36,176)		(76,132)		(68,824)
Amortization of net actuarial loss	8,117		10,489		16,234		20,978		37,211		38,990
Net periodic benefit cost	$	10,418	$	12,799	$	20,836	$	25,598	$	46,432	$	50,890
	SERP
	June 30,
	Three Months				Six Months				Twelve Months
	2022		2021		2022		2021		2022		2021
(Thousands of dollars)
Service cost	$	106	$	132	$	212	$	263	$	475	$	457
Interest cost	360		358		720		716		1,435		1,517
Amortization of net actuarial loss	587		660		1,175		1,320		2,497		2,223
Net periodic benefit cost	$	1,053	$	1,150	$	2,107	$	2,299	$	4,407	$	4,197
	PBOP
	June 30,
	Three Months				Six Months				Twelve Months
	2022		2021		2022		2021		2022		2021
(Thousands of dollars)
Service cost	$	485	$	423	$	970	$	846	$	1,815	$	1,636
Interest cost	613		548		1,226		1,096		2,323		2,388
Expected return on plan assets	(807)		(810)		(1,614)		(1,620)		(3,233)		(3,324)
Amortization of prior service costs	44		240		88		480		567		1,057
Net periodic benefit cost	$	335	$	401	$	670	$	802	$	1,472	$	1,757

19

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Note 3 – Revenue

The following information about the Company’s revenues is presented by segment. Southwest encompasses the natural gas distribution segment, Centuri encompasses the utility infrastructure services segment, and MountainWest encompasses the pipeline and storage segment. Certain disclosures, where materially consistent with those provided most recently in the 2021 Form 10-K, are not repeated below.

Natural Gas Distribution Segment:

Southwest’s operating revenues included on the Condensed Consolidated Statements of Income of both the Company and Southwest include revenue from contracts with customers, which is shown below, disaggregated by customer type, in addition to other categories of revenue:

	Three Months Ended June 30,				Six Months Ended June 30,				Twelve Months Ended June 30,
(Thousands of dollars)	2022		2021		2022		2021		2022		2021
Residential	$	228,573	$	193,322	$	743,159	$	596,465	$	1,182,306	$	995,132
Small commercial	78,730		56,093		202,714		137,491		335,437		235,114
Large commercial	20,989		13,158		41,150		25,831		72,690		47,818
Industrial/other	10,773		6,974		20,745		20,744		42,314		33,785
Transportation	24,466		21,797		51,098		46,333		97,005		90,307
Revenue from contracts with customers	363,531		291,344		1,058,866		826,864		1,729,752		1,402,156
Alternative revenue program revenues (deferrals)	11,022		(1,531)		(12,477)		(17,904)		18,608		(6,110)
Other revenues (1)	3,389		2,983		8,092		5,768		13,183		4,006
Total Regulated operations revenues	$	377,942	$	292,796	$	1,054,481	$	814,728	$	1,761,543	$	1,400,052

(1) Amounts include late fees and other miscellaneous revenues, and may also include the impact of certain regulatory mechanisms, such as cost-of-service components in customer rates expected to be returned to customers in future periods. Also includes the impacts of a temporary moratorium on late fees and disconnection for nonpayment during the COVID-19 pandemic.

Utility Infrastructure Services Segment:

The following tables display Centuri’s revenue, reflected as Utility infrastructure services revenues on the Condensed Consolidated Statements of Income of the Company, representing revenue from contracts with customers disaggregated by service and contract types:

	Three Months Ended June 30,				Six Months Ended June 30,				Twelve Months Ended June 30,
(Thousands of dollars)	2022		2021		2022		2021		2022		2021
Service Types:
Gas infrastructure services	$	418,869	$	346,877	$	679,551	$	568,714	$	1,413,177	$	1,282,008
Electric power infrastructure services	179,749		97,644		361,717		191,605		695,314		435,825
Other	107,472		84,104		188,699		132,281		387,537		294,749
Total Utility infrastructure services revenues	$	706,090	$	528,625	$	1,229,967	$	892,600	$	2,496,028	$	2,012,582

20

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

	Three Months Ended June 30,				Six Months Ended June 30,					Twelve Months Ended June 30,
(Thousands of dollars)	2022		2021		2022			2021		2022			2021
Contract Types:
Master services agreement	$	617,489	$	398,650	$	1,062,834	*	$	692,330	$	2,023,482	*	$	1,543,292
Bid contract	88,601		129,975		167,133		*	200,270		472,546		*	469,290
Total Utility infrastructure services revenues	$	706,090	$	528,625	$	1,229,967		$	892,600	$	2,496,028		$	2,012,582
Unit price contracts	$	421,927	$	361,926	$	724,450		$	596,375	$	1,497,157		$	1,344,626
Fixed price contracts	128,793		50,455		215,330			85,049		398,023			179,194
Time and materials contracts	155,370		116,244		290,187			211,176		600,848			488,762
Total Utility infrastructure services revenues	$	706,090	$	528,625	$	1,229,967		$	892,600	$	2,496,028		$	2,012,582

* The Company identified an error in the first quarter 2022 disclosure which resulted in an understatement of $88.8 million in the master services agreement category and an overstatement by the same amount in the bid contract category. Management concluded this item was not material to the previously issued financial statements and will revise the first quarter 2022 amounts in future filings.

The following table provides information about contracts receivable and revenue earned on contracts in progress in excess of billings (contract assets), both of which are included within Accounts receivable, net of allowances, as well as amounts billed in excess of revenue earned on contracts (contract liabilities), which are included in Other current liabilities as of June 30, 2022 and December 31, 2021 on the Company’s Condensed Consolidated Balance Sheets:

(Thousands of dollars)	June 30, 2022		December 31, 2021
Contracts receivable, net	$	332,433	$	296,005
Revenue earned on contracts in progress in excess of billings	254,259		214,774
Amounts billed in excess of revenue earned on contracts	13,738		11,860

The revenue earned on contracts in progress in excess of billings (contract asset) primarily relates to Centuri’s right to consideration for work completed but not billed and/or approved for billing at the reporting date. These contract assets are transferred to contracts receivable when the rights become unconditional. The amounts billed in excess of revenue earned (contract liability) primarily relate to the advance consideration received from customers for which work has not yet been completed. The change in this contract liability balance from December 31, 2021 to June 30, 2022 is due to increases in cash received, net of revenue recognized, from contracts that commenced during the period, offset by revenue recognized of approximately $11.9 million that was included in this balance as of January 1, 2022, after which time it became earned and the balance was reduced.

For contracts that have an original duration of one year or less, Centuri uses the practical expedient applicable to such contracts and does not consider/compute an interest component based on the time value of money. Furthermore, because of the short duration of these contracts, Centuri has not disclosed the transaction price for the remaining performance obligations as of the end of each reporting period or when the Company expects to recognize the revenue.

As of June 30, 2022, Centuri had 47 fixed price contracts with an original duration of more than one year. The aggregate amount of the transaction price allocated to the unsatisfied performance obligations of these contracts as of June 30, 2022 was $465.7 million. Centuri expects to recognize the remaining performance obligations over approximately the next 2.9 years; however, the timing of that recognition is largely within the control of the customer, including when the necessary equipment and materials required to complete the work are provided by the customer.

Utility infrastructure services contracts receivable consists of the following:

(Thousands of dollars)	June 30, 2022		December 31, 2021
Billed on completed contracts and contracts in progress	$	331,173	$	292,770
Other receivables	1,408		3,492
Contracts receivable, gross	332,581		296,262
Allowance for doubtful accounts	(148)		(257)
Contracts receivable, net	$	332,433	$	296,005

21

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Pipeline and Storage Segment:

MountainWest derives revenue on the basis of services rendered, commodities delivered, or contracts settled and includes amounts yet to be billed to customers. MountainWest generates revenue and earnings from annual reservation payments under firm peaking storage and firm transportation contracts. Straight-fixed-variable rate designs are used to allow for recovery of substantially all fixed costs in demand or reservation charges, thereby reducing the earnings impact of volume changes on gas transportation and storage operations.

MountainWest receives upfront payment for certain storage services it provides to customers, which are considered to be contract liabilities. These payments are amortized to revenue over the term of the contract.

The primary types of sales and service activities reported as revenue from contracts with customers are FERC-regulated gas transportation and storage services, and to a lesser extent, natural gas liquid (“NGL”) revenues consisting primarily of NGL processing services, and other revenue (consisting of natural gas sales, as well as services related to gathering and processing activities and miscellaneous service revenue).

Transportation and storage contracts are primarily stand-ready service contracts that include fixed reservation and variable usage fees. Fixed fees are recognized ratably over the life of the contract as the stand-ready performance obligations are satisfied, while variable usage fees are recognized when MountainWest has a right to consideration from a customer in an amount that corresponds directly with the value to the customer of the performance obligation completed to date. Substantially all of MountainWest’s revenues are derived from performance obligations satisfied over time, rather than recognized at a single point in time. Payment for most sales and services varies by contract type, but is typically due within a month of billing.

MountainWest typically receives or retains NGLs and natural gas from customers when providing natural gas processing, transportation, or storage services. MountainWest records the fair value of NGLs received as service revenue recognized over time and recognizes revenue from the subsequent sale of the NGLs to customers upon delivery. MountainWest typically retains some natural gas under certain transportation service arrangements, intended to facilitate performance of the service and allow for natural losses that occur. As the intent of the retention amount is to enable fulfillment of the contract rather than to provide compensation for services, the fuel allowance is not included in revenue.

MountainWest Regulated operations revenues on the Condensed Consolidated Statements of Income of the Company include revenue from contracts with customers, which is shown below, disaggregated by categories of sales and service activities.

	Three Months Ended June 30,		Six Months Ended June 30,
(Thousands of dollars)	2022
Regulated gas transportation and storage revenues	$	57,786	119,763
NGL revenues	1,876		3,369
Other revenues	2,380		5,859
Revenue from contracts with customers	62,042		128,991
Other revenues	46		90
Total Regulated operations revenues	$	62,088	129,081

MountainWest has certain multi-year contracts with fixed-price performance obligations that were unsatisfied (or partially unsatisfied) at the end of the reporting period, whereby revenue will be earned over time as MountainWest stands ready to provide service. These amounts are not material to the Company’s financial statements overall. MountainWest also has certain contract liabilities related to consideration received from customers with an obligation to transfer goods or services subsequent to the balance sheet date, amounts for which are generally consistent between December 31, 2021 and June 30, 2022 and are not material.

22

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Note 4 – Common Stock

Shares of the Company’s common stock are publicly traded on the New York Stock Exchange, under the ticker symbol “SWX.” Share-based compensation related to Southwest and Centuri is based on stock awards to be issued in shares of Southwest Gas Holdings, Inc.

On April 8, 2021, the Company entered into a Sales Agency Agreement between the Company and BNY Mellon Capital Markets, LLC and J.P. Morgan Securities LLC (the “Equity Shelf Program”) for the offer and sale of up to $500 million of common stock from time to time in an at-the-market offering program. The shares are issued pursuant to the Company’s automatic shelf registration statement on Form S-3 (File No. 333-251074), or “the Universal Shelf.” There was no activity under the Equity Shelf Program during the quarter ended June 30, 2022. The following table provides the life-to-date activity under that program through June 30, 2022:

Gross proceeds	$	158,180,343
Less: agent commissions	(1,581,803)
Net proceeds	$	156,598,540
Number of shares sold	2,302,407
Weighted average price per share	$	68.70

As of June 30, 2022, the Company had approximately $341.8 million in common stock available for sale under the program.

In March 2022, the Company issued, through a separate prospectus supplement under the Universal Shelf, an aggregate of 6.325 million shares of common stock, in an underwritten public offering price of $74.00 per share, resulting in proceeds to the Company of $452.3 million, net of an underwriters’ discount of $15.8 million. The Company used the net proceeds to repay a portion of the outstanding borrowings under the 364-day term loan credit agreement that was used to initially fund the MountainWest acquisition.

During the six months ended June 30, 2022, the Company issued approximately 191,000 shares of common stock through the Restricted Stock/Unit Plan and Omnibus Incentive Plan.

Additionally, during the six months ended June 30, 2022, the Company issued 66,000 shares of common stock through the Dividend Reinvestment and Stock Purchase Plan, raising approximately $5.1 million.

In connection with the entry into the Cooperation Agreement (see Note 1 – Background, Organization, and Summary of Significant Accounting Policies), the Company entered into the Amended Rights Agreement to increase the beneficial ownership percentage included in the definition of “Acquiring Person” from 10% to 24.9% and to delete the concept of a “Passive Institutional Investor” to permit the Icahn Group to consummate the Offer.

23

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Note 5 – Debt

Long-Term Debt

Long-term debt is recognized in the Company’s and Southwest’s Condensed Consolidated Balance Sheets generally at the carrying value of the obligations outstanding. Details surrounding the fair value and individual carrying values of instruments are provided in the table that follows.

	June 30, 2022				December 31, 2021
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
(Thousands of dollars)
Southwest Gas Corporation:
Debentures:
Notes, 6.1%, due 2041	$	125,000	$	126,410	$	125,000	$	166,380
Notes, 4.05%, due 2032	600,000		549,396		—		—
Notes, 3.875%, due 2022	—		—		250,000		250,603
Notes, 4.875%, due 2043	250,000		230,653		250,000		307,538
Notes, 3.8%, due 2046	300,000		235,140		300,000		329,055
Notes, 3.7%, due 2028	300,000		283,260		300,000		325,191
Notes, 4.15%, due 2049	300,000		250,461		300,000		342,030
Notes, 2.2%, due 2030	450,000		365,054		450,000		440,838
Notes, 3.18%, due 2051	300,000		211,326		300,000		292,116
8% Series, due 2026	75,000		84,078		75,000		92,623
Medium-term notes, 7.78% series, due 2022	—		—		25,000		25,122
Medium-term notes, 7.92% series, due 2027	25,000		27,821		25,000		31,555
Medium-term notes, 6.76% series, due 2027	7,500		7,839		7,500		8,949
Unamortized discount and debt issuance costs	(26,627)				(19,959)
	2,705,873				2,387,541
Revolving credit facility and commercial paper	—		—		130,000		130,000
Industrial development revenue bonds:
Tax-exempt Series A, due 2028	50,000		50,000		50,000		50,000
2003 Series A, due 2038	50,000		50,000		50,000		50,000
2008 Series A, due 2038	50,000		50,000		50,000		50,000
2009 Series A, due 2039	50,000		50,000		50,000		50,000
Unamortized discount and debt issuance costs	(1,774)				(1,938)
	198,226				198,062
Less: current maturities	—				(275,000)
Southwest Gas Corporation total long-term debt, less current maturities	$	2,904,099			$	2,440,603
Southwest Gas Holdings, Inc.:
Centuri secured term loan facility	$	1,011,413	$	970,329	$	1,117,138	$	1,117,841
Centuri secured revolving credit facility	145,885		145,759		103,329		103,749
MountainWest unsecured senior notes, 3.53%, due in 2028	101,922		90,430		102,078		102,078
MountainWest unsecured senior notes, 4.875%, due in 2041	199,599		157,894		199,926		199,926
MountainWest unsecured senior notes, 3.91%, due in 2038	147,786		113,703		147,735		147,735
Other debt obligations	141,653		129,810		51,665		50,003
Unamortized discount and debt issuance costs	(22,627)				(24,466)
Less: current maturities	(41,276)				(22,324)
Southwest Gas Holdings, Inc. total long-term debt, less current maturities	$	4,588,454			$	4,115,684

24

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Southwest has a $400 million credit facility that is scheduled to expire in April 2025. Southwest designates $150 million of associated capacity as long-term debt and the remaining $250 million for working capital purposes. Interest rates for the credit facility are calculated at either the Secured Overnight Financing Rate (“SOFR”) or an “alternate base rate,” plus in each case an applicable margin that is determined based on Southwest’s senior unsecured debt rating. At June 30, 2022, the applicable margin is 1.125% for loans bearing interest with reference to SOFR and 0.125% for loans bearing interest with reference to the alternative base rate. At June 30, 2022, no borrowings were outstanding on the long-term portion of the facility (including under the commercial paper program, discussed below), nor on the short-term portion of the facility.

Southwest has a $50 million commercial paper program. Issuances under the commercial paper program are supported by Southwest’s revolving credit facility and, therefore, do not represent additional borrowing capacity under the credit facility. Borrowings under the commercial paper program, if any, are designated as long-term debt. Interest rates for the program are calculated at the then current commercial paper rate. At June 30, 2022, as noted above, no borrowings were outstanding under the commercial paper program.

In March 2022, Southwest issued $600 million aggregate principal amount of 4.05% Senior Notes at a discount of 0.65%. The notes will mature in March 2032. Southwest used the net proceeds to redeem the $250 million 3.875% notes due in April 2022 and to repay outstanding amounts under its credit facility, with the remaining net proceeds used for general corporate purposes.

Centuri has a $1.545 billion secured revolving credit and term loan multi-currency facility. Amounts can be borrowed in either Canadian or U.S. dollars. The revolving credit facility matures on August 27, 2026 and the term loan facility matures on August 27, 2028. Interest rates for the revolving credit facility and term loan facility are based on either a “base rate” or LIBOR, plus an applicable margin in either case. The capacity of the line of credit portion of the facility is $400 million; related amounts borrowed and repaid are available to be re-borrowed. The term loan portion of the facility has a limit of $1.145 billion. The obligations under the credit agreement are secured by present and future ownership interests in substantially all direct and indirect subsidiaries of Centuri, substantially all of the tangible and intangible personal property of each borrower, certain of their direct and indirect subsidiaries, and all products, profits, and proceeds of the foregoing. Centuri’s assets securing the facility at June 30, 2022 totaled $2.5 billion. At June 30, 2022, $1.157 billion in borrowings were outstanding under Centuri’s combined secured revolving credit and term loan facility.

MountainWest has two private placement unsecured senior notes and a public unsecured senior note, with a combined carrying value of $449.3 million and aggregate principal amount of $430 million. The carrying value is higher than the principal balance as amounts outstanding were recorded at their fair values as of the December 31, 2021 acquisition date of the MountainWest entities.

Short-Term Debt

Southwest Gas Holdings, Inc. has a $200 million credit facility that is scheduled to expire in December 2026 and is primarily used for short-term financing needs. Interest rates for the credit facility are calculated at either SOFR or the “alternate base rate” plus in each case an applicable margin. There was $90 million outstanding under this credit facility as of June 30, 2022.

As indicated above, under Southwest’s $400 million credit facility, no short-term borrowings were outstanding at June 30, 2022.

In March 2022, Southwest amended its $250 million Term Loan (the “March 2021 Term Loan”), extending the maturity date to March 21, 2023 and replacing LIBOR interest rate benchmarks with SOFR interest rate benchmarks. The proceeds were originally used to fund the increased cost of natural gas supply during the month of February 2021, caused by extreme weather conditions in the central U.S. There was $225 million outstanding under the March 2021 Term Loan as of June 30, 2022.

In November 2021, Southwest Gas Holdings, Inc. entered into a 364-day term loan credit agreement (the “Credit Agreement”). The Credit Agreement provided for a $1.6 billion delayed-draw term loan (the “Term Loan Facility”) to primarily fund the acquisition of the equity interests in MountainWest (refer to Note 8 - Business Acquisitions). The Term Loan Facility was funded on December 31, 2021, and matures on December 30, 2022. There was $1.15 billion outstanding under the Term Loan Facility as of June 30, 2022.

The borrowings under the Term Loan Facility created a negative working capital condition for the Company, which as of June 30, 2022 is approximately $707 million. As of August 9, 2022, the Company does not have sufficient liquidity or capital resources to repay the Term Loan Facility without issuing new debt or equity. As disclosed in Note 1 – Background, Organization, and Summary of Significant Accounting Policies, the Company is exploring strategic alternatives, including a potential sale of MountainWest. Management intends to either issue long-term debt to refinance the Term Loan Facility or extend the Term Loan Facility up to 364 days. If MountainWest is sold as part of the Strategic Review process, the proceeds will be used to repay the amounts borrowed to fund the acquisition.

25

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Management believes that its refinancing plan is probable based on the Company’s ability to generate consistent cash flows, its current credit ratings, its relationships with its lenders and its prior history of successfully raising debt and equity necessary to fund its acquisitions and operations. As such, management has concluded that the Company can satisfy its obligations for at least the next twelve months from the issuance date of these financial statements.

The Company’s ability to access capital markets or to otherwise obtain sufficient financing may be affected by future conditions. If the Company is unable to execute its plan to refinance debt obligations, the Company’s credit facility could be terminated, and amounts due under its revolver and other borrowing arrangements could be declared immediately due and payable.

LIBOR

Certain rates established at LIBOR are scheduled to be discontinued as a benchmark or reference rate after 2021, while other LIBOR-based rates are scheduled to be discontinued after June 2023. As of June 30, 2022, the Company had $2.16 billion in aggregate outstanding borrowings under Centuri’s combined facility and Southwest Gas Holdings, Inc.’s Term Loan Facility. Southwest had no outstanding borrowings or variable rate debt agreements with reference to LIBOR as of June 30, 2022. In order to mitigate the impact on the financial condition and results of operations of the Company, management will monitor developments and work with lenders to determine the appropriate replacement/alternative reference rate for variable rate debt. At this time the Company can provide no assurances as to the impact a LIBOR discontinuance will have on its financial condition or results of operations. Any alternative rate may be less predictable or less attractive than LIBOR.

26

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Note 6 – Other Comprehensive Income and Accumulated Other Comprehensive Income

The following information presents the Company’s Other comprehensive income (loss), both before and after-tax impacts, within the Condensed Consolidated Statements of Comprehensive Income, which also impact Accumulated other comprehensive income (“AOCI”) in the Condensed Consolidated Balance Sheets and the Condensed Consolidated Statements of Equity.

Related Tax Effects Allocated to Each Component of Other Comprehensive Income (Loss)

	Three Months Ended June 30, 2022						Three Months Ended June 30, 2021
(Thousands of dollars)	Before- Tax Amount		Tax (Expense) or Benefit (1)		Net-of- Tax Amount		Before- Tax Amount		Tax (Expense) or Benefit (1)		Net-of- Tax Amount
Defined benefit pension plans:
Amortization of prior service cost	$	44	$	(11)	$	33	$	240	$	(58)	$	182
Amortization of net actuarial (gain)/loss	8,704		(2,089)		6,615		11,148		(2,676)		8,472
Regulatory adjustment	(7,268)		1,744		(5,524)		(9,575)		2,298		(7,277)
Pension plans other comprehensive income (loss)	1,480		(356)		1,124		1,813		(436)		1,377
FSIRS (designated hedging activities):
Amounts reclassified into net income	—		—		—		544		(130)		414
FSIRS other comprehensive income (loss)	—		—		—		544		(130)		414
Total other comprehensive income (loss) - Southwest Gas Corporation	1,480		(356)		1,124		2,357		(566)		1,791
Foreign currency translation adjustments:
Translation adjustments	(2,680)		—		(2,680)		909		—		909
Foreign currency other comprehensive income (loss)	(2,680)		—		(2,680)		909		—		909
Total other comprehensive income (loss) - Southwest Gas Holdings, Inc.	$	(1,200)	$	(356)	$	(1,556)	$	3,266	$	(566)	$	2,700
	Six Months Ended June 30, 2022						Six Months Ended June 30, 2021
(Thousands of dollars)	Before- Tax Amount		Tax (Expense) or Benefit (1)		Net-of- Tax Amount		Before- Tax Amount		Tax (Expense) or Benefit (1)		Net-of- Tax Amount
Defined benefit pension plans:
Amortization of prior service cost	$	88	$	(22)	$	66	$	480	$	(116)	$	364
Amortization of net actuarial (gain)/loss	17,409		(4,178)		13,231		22,297		(5,351)		16,946
Regulatory adjustment	(14,536)		3,489		(11,047)		(19,150)		4,596		(14,554)
Pension plans other comprehensive income (loss)	2,961		(711)		2,250		3,627		(871)		2,756
FSIRS (designated hedging activities):
Amounts reclassified into net income	545		(129)		416		1,088		(261)		827
FSIRS other comprehensive income (loss)	545		(129)		416		1,088		(261)		827
Total other comprehensive income (loss) - Southwest Gas Corporation	3,506		(840)		2,666		4,715		(1,132)		3,583
Foreign currency translation adjustments:
Translation adjustments	(1,433)		—		(1,433)		1,732		—		1,732
Foreign currency other comprehensive income (loss)	(1,433)		—		(1,433)		1,732		—		1,732
Total other comprehensive income (loss) - Southwest Gas Holdings, Inc.	$	2,073	$	(840)	$	1,233	$	6,447	$	(1,132)	$	5,315

27

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

	Twelve Months Ended June 30, 2022						Twelve Months Ended June 30, 2021
(Thousands of dollars)	Before- Tax Amount		Tax (Expense) or Benefit (1)		Net-of- Tax Amount		Before- Tax Amount		Tax (Expense) or Benefit (1)		Net-of- Tax Amount
Defined benefit pension plans:
Net actuarial gain/(loss)	$	59,176	$	(14,202)	$	44,974	$	(57,539)	$	13,809	$	(43,730)
Amortization of prior service cost	567		(136)		431		1,057		(255)		802
Amortization of net actuarial (gain)/loss	39,709		(9,530)		30,179		41,212		(9,890)		31,322
Regulatory adjustment	(83,580)		20,060		(63,520)		5,075		(1,219)		3,856
Pension plans other comprehensive income (loss)	15,872		(3,808)		12,064		(10,195)		2,445		(7,750)
FSIRS (designated hedging activities):
Amounts reclassified into net income	1,631		(390)		1,241		2,662		(639)		2,023
FSIRS other comprehensive income (loss)	1,631		(390)		1,241		2,662		(639)		2,023
Total other comprehensive income (loss) - Southwest Gas Corporation	17,503		(4,198)		13,305		(7,533)		1,806		(5,727)
Foreign currency translation adjustments:
Translation adjustments	(3,145)		—		(3,145)		5,656		—		5,656
Foreign currency other comprehensive income (loss)	(3,145)		—		(3,145)		5,656		—		5,656
Total other comprehensive income (loss) - Southwest Gas Holdings, Inc.	$	14,358	$	(4,198)	$	10,160	$	(1,877)	$	1,806	$	(71)

(1)Tax amounts are calculated using a 24% rate. The Company has elected to indefinitely reinvest, in Canada, the earnings of Centuri’s Canadian subsidiaries, thus precluding deferred taxes on such earnings. As a result of this assertion, and no repatriation of earnings anticipated, the Company is not recognizing a tax effect or presenting a tax expense or benefit for currency translation adjustments reported in Other comprehensive income (loss).

The following table represents a rollforward of AOCI, presented on the Company’s Condensed Consolidated Balance Sheets and its Condensed Consolidated Statements of Equity:

	Defined Benefit Plans						FSIRS						Foreign Currency Items
(Thousands of dollars)	Before-Tax		Tax (Expense) Benefit (4)		After-Tax		Before-Tax		Tax (Expense) Benefit (4)		After-Tax		Before-Tax		Tax (Expense) Benefit		After-Tax		AOCI
Beginning Balance AOCI December 31, 2021	$	(61,182)	$	14,685	$	(46,497)	$	(545)	$	129	$	(416)	$	152	$	—	$	152	$	(46,761)
Translation adjustments	—		—		—		—		—		—		(1,433)		—		(1,433)		(1,433)
Other comprehensive income (loss) before reclassifications	—		—		—		—		—		—		(1,433)		—		(1,433)		(1,433)
FSIRS amount reclassified from AOCI (1)	—		—		—		545		(129)		416		—		—		—		416
Amortization of prior service cost (2)	88		(22)		66		—		—		—		—		—		—		66
Amortization of net actuarial loss (2)	17,409		(4,178)		13,231		—		—		—		—		—		—		13,231
Regulatory adjustment (3)	(14,536)		3,489		(11,047)		—		—		—		—		—		—		(11,047)
Net current period other comprehensive income (loss) attributable to Southwest Gas Holdings, Inc.	2,961		(711)		2,250		545		(129)		416		(1,433)		—		(1,433)		1,233
Ending Balance AOCI June 30, 2022	$	(58,221)	$	13,974	$	(44,247)	$	—	$	—	$	—	$	(1,281)	$	—	$	(1,281)	$	(45,528)

(1)The FSIRS reclassification amount is included in Net interest deductions on the Company’s Condensed Consolidated Statements of Income.

(2)These AOCI components are included in the computation of net periodic benefit cost (see Note 2 – Components of Net Periodic Benefit Cost for additional details).

(3)The regulatory adjustment represents the portion of the activity above that is expected to be recovered through rates in the future (the related regulatory asset is included in Deferred charges and other assets on the Company’s Condensed Consolidated Balance Sheets).

(4)Tax amounts are calculated using a 24% rate.

28

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

The following table represents a rollforward of AOCI, presented on Southwest’s Condensed Consolidated Balance Sheets:

	Defined Benefit Plans						FSIRS
(Thousands of dollars)	Before-Tax		Tax (Expense) Benefit (8)		After-Tax		Before-Tax		Tax (Expense) Benefit (8)		After-Tax		AOCI
Beginning Balance AOCI December 31, 2021	$	(61,182)	$	14,685	$	(46,497)	$	(545)	$	129	$	(416)	$	(46,913)
FSIRS amount reclassified from AOCI (5)	—		—		—		545		(129)		416		416
Amortization of prior service cost (6)	88		(22)		66		—		—		—		66
Amortization of net actuarial loss (6)	17,409		(4,178)		13,231		—		—		—		13,231
Regulatory adjustment (7)	(14,536)		3,489		(11,047)		—		—		—		(11,047)
Net current period other comprehensive income attributable to Southwest Gas Corporation	2,961		(711)		2,250		545		(129)		416		2,666
Ending Balance AOCI June 30, 2022	$	(58,221)	$	13,974	$	(44,247)	$	—	$	—	$	—	$	(44,247)

(5)    The FSIRS reclassification amount is included in Net interest deductions on Southwest’s Condensed Consolidated Statements of Income.

(6)These AOCI components are included in the computation of net periodic benefit cost (see Note 2 – Components of Net Periodic Benefit Cost for additional details).

(7)The regulatory adjustment represents the portion of the activity above that is expected to be recovered through rates in the future (the related regulatory asset is included in Deferred charges and other assets on Southwest’s Condensed Consolidated Balance Sheets).

(8)Tax amounts are calculated using a 24% rate.

The following table represents amounts (before income tax impacts) included in AOCI (in the tables above), that have not yet been recognized in net periodic benefit cost:

(Thousands of dollars)	June 30, 2022		December 31, 2021
Net actuarial loss	$	(381,601)	$	(399,010)
Prior service cost	(1,440)		(1,528)
Less: amount recognized in regulatory assets	324,820		339,356
Recognized in AOCI	$	(58,221)	$	(61,182)

Note 7 – Segment Information

As a result of the MountainWest acquisition on December 31, 2021, management updated its segment reporting from the historical presentation of two reportable segments to three reportable segments, with MountainWest presented as the pipeline and storage segment. Southwest comprises the natural gas distribution segment and Centuri comprises the utility infrastructure services segment.

Centuri accounts for the services provided to Southwest at contractual prices. Accounts receivable for these services, which are not eliminated during consolidation, are presented in the table below:

(Thousands of dollars)	June 30, 2022		December 31, 2021
Centuri accounts receivable for services provided to Southwest	$	16,915	$	15,166

29

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

In order to reconcile (below) to net income as disclosed in the Condensed Consolidated Statements of Income, an Other column is included associated with impacts of corporate and administrative activities related to Southwest Gas Holdings, Inc. The financial information pertaining to the natural gas distribution, utility infrastructure services, and pipeline and storage segments are as follows:

(Thousands of dollars)	Natural Gas Distribution		Utility Infrastructure Services		Pipeline and Storage		Other		Total
Three Months Ended June 30, 2022
Revenues from external customers	$	377,942	$	672,119	$	62,088	$	—	$	1,112,149
Intersegment revenues	—		33,971		—		—		33,971
Total	$	377,942	$	706,090	$	62,088	$	—	$	1,146,120
Segment net income (loss)	$	(2,266)	$	4,741	$	15,076	$	(24,126)	$	(6,575)
Three Months Ended June 30, 2021
Revenues from external customers	$	292,796	$	504,941	$	—	$	—	$	797,737
Intersegment revenues	—		23,684		—		—		23,684
Total	$	292,796	$	528,625	$	—	$	—	$	821,421
Segment net income (loss)	$	11,413	$	15,116	$	—	$	(1,410)	$	25,119
(Thousands of dollars)	Natural Gas Operations		Utility Infrastructure Services		Pipeline and Storage		Other		Total
Six Months Ended June 30, 2022
Revenues from external customers	$	1,054,481	$	1,167,663	$	129,081	$	—	$	2,351,225
Intersegment revenues	—		62,304		—		—		62,304
Total	$	1,054,481	$	1,229,967	$	129,081	$	—	$	2,413,529
Segment net income (loss)	$	109,529	$	(18,745)	$	32,006	$	(33,187)	$	89,603
Six Months Ended June 30, 2021
Revenues from external customers	$	814,728	$	844,713	$	—	$	—	$	1,659,441
Intersegment revenues	—		47,887		—		—		47,887
Total	$	814,728	$	892,600	$	—	$	—	$	1,707,328
Segment net income (loss)	$	130,128	$	14,257	$	—	$	(1,973)	$	142,412

(Thousands of dollars)	Natural Gas Distribution		Utility Infrastructure Services		Pipeline and Storage		Other		Total
Twelve Months Ended June 30, 2022
Revenues from external customers	$	1,761,543	$	2,379,265	$	129,081	$	—	$	4,269,889
Intersegment revenues	—		116,763		—		—		116,763
Total	$	1,761,543	$	2,496,028	$	129,081	$	—	$	4,386,652
Segment net income (loss)	$	166,536	$	7,418	$	32,006	$	(57,990)	$	147,970
Twelve Months Ended June 30, 2021
Revenues from external customers	$	1,400,052	$	1,899,961	$	—	$	—	$	3,300,013
Intersegment revenues	—		112,621		—		—		112,621
Total	$	1,400,052	$	2,012,582	$	—	$	—	$	3,412,634
Segment net income (loss)	$	193,705	$	73,056	$	—	$	(2,532)	$	264,229

30

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

The corporate and administrative activities for Southwest Gas Holdings, Inc. in the three-, six-, and twelve-month periods ended June 30, 2022 include expenses incurred related to shareholder activism and related settlement activities, expenses incurred in conducting the Strategic Review, and expenses and financing costs for the MountainWest acquisition.

Note 8 - Business Acquisitions

In August 2021, the Company, through its subsidiaries, led principally by Centuri, completed the acquisition of Drum, including its primary subsidiary, Riggs Distler. In November 2021, certain members of Riggs Distler management acquired a 1.42% interest in Drum. See the Company’s 2021 Form 10-K for additional information about this acquisition.

Assets acquired and liabilities assumed in the transaction were recorded at their acquisition date fair values. Transaction costs associated with the acquisition were expensed as incurred. The Company’s allocation of the purchase price was based on an evaluation of the appropriate fair values and represented management’s best estimate based on available data (including market data, data regarding customers of the acquired businesses, terms of acquisition-related agreements, analysis of historical and projected results, and other types of data). The analysis included consideration of types of intangibles that were acquired, including customer relationships, trade name, and backlog. Certain payments were estimated as of the acquisition date and were adjusted when amounts were finalized. Further adjustments may still occur. Due to the estimations made, the final purchase accounting has not yet been completed and further refinements may occur, including potential changes to income taxes.

The preliminary estimated fair values of assets acquired and liabilities assumed as of August 27, 2021, and as updated through June 30, 2022, are as follows:

(Millions of dollars)	Acquisition Date		Measurement Period Adjustments		Revised Acquisition Date
Cash and cash equivalents	$	1.9	$	—	$	1.9
Accounts receivable	69.1		(8.6)		60.5
Contract assets	40.1		7.4		47.5
Income taxes receivable, net	0.7		—		0.7
Right of use assets under operating leases	1.5		—		1.5
Prepaid expenses	5.2		—		5.2
Property and equipment	118.1		1.2		119.3
Intangible assets	335.0		(31.5)		303.5
Goodwill	446.8		1.8		448.6
Total assets acquired	1,018.4		$	(29.7)	$	988.7
Trade and other payables	46.2		—		46.2
Finance lease obligations	27.5		1.2		28.7
Contract liabilities	12.7		—		12.7
Operating lease obligations	1.5		—		1.5
Other liabilities	5.3		(1.2)		4.1
Deferred tax liabilities	94.8		(23.4)		71.4
Total liabilities assumed and noncontrolling interest	188.0		(23.4)		164.6
Net assets acquired	$	830.4	$	(6.3)	$	824.1

The Company incurred and expensed acquisition costs of $14 million, included in Utility infrastructure services expenses in the Company’s Condensed Consolidated Statement of Income for the twelve months ended June 30, 2022. No acquisition-related costs were incurred during the three and six months ended June 30, 2022, and no significant impacts to earnings resulted from the measurement-period adjustments reflected above.

In December 2021 Southwest Gas Holdings, Inc. completed the acquisition of Dominion Energy Questar Pipeline, LLC and related entities (subsequently rebranded as “MountainWest”), which resulted in MountainWest becoming a wholly owned subsidiary of the Company. See the Company’s 2021 Form 10-K for additional information about this acquisition.

Assets acquired and liabilities assumed in the transaction were recorded at their acquisition date fair values. Transaction costs associated with the acquisition were expensed as incurred. The majority of the operations acquired are subject to FERC rate-regulation and therefore are accounted for pursuant to ASC 980, Regulated Operations. The fair values of MountainWest’s

31

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

assets and liabilities, subject to rate making and cost recovery provisions, provide revenues derived from costs of service, including a return on investment of assets and liabilities included in rate base. Accordingly, the carrying values of such assets and liabilities were deemed to approximate their fair values. The fair value of the MountainWest assets and liabilities assumed that are not subject to the rate-regulation provisions discussed above include a 50% equity method investment, non-regulated property, plant and equipment, and long-term debt assumed; related fair values were determined using a market approach, income approach, or cost approach, as appropriate. Amounts related to post-closing payments and deferred taxes were estimated as of the acquisition date and adjusted when determined during the period ended June 30, 2022. No other measurement period adjustments occurred during the period. However, the final purchase accounting has not yet been completed and further refinements may occur, including finalization of income tax-related amounts.

The preliminary estimated fair values of assets acquired and liabilities assumed as of December 31, 2021, and as updated through June 30, 2022, are as follows:

(Millions of dollars)	Acquisition Date		Measurement Period Adjustments		Revised Acquisition Date
Gas plant, net	$	1,047.4	$	—	$	1,047.4
Other property and investments	51.3		—		51.3
Cash and cash equivalents	17.6		—		17.6
Accounts receivable, net of allowances	26.6		2.9		29.5
Prepaid and other current assets	27.4		—		27.4
Deferred charges and other assets	31.1		—		31.1
Goodwill	986.2		(28.2)		958.0
Deferred income taxes, net	15.4		20.9		36.3
Total assets acquired	2,203.0		(4.4)		2,198.6
Long-term debt	449.7		—		449.7
Accounts payable	7.0		—		7.0
Deferred purchased gas costs	5.7		—		5.7
Customer deposits	3.2		—		3.2
Accrued general taxes	0.4		—		0.4
Accrued interest	4.7		—		4.7
Other current liabilities	14.5		—		14.5
Accumulated removal costs	56.6		—		56.6
Other deferred credits	85.6		—		85.6
Total liabilities assumed	627.4		—		627.4
Net assets acquired	$	1,575.6	$	(4.4)	$	1,571.2

The Company incurred and expensed acquisition costs of $18.5 million for the twelve months ended June 30, 2022, which are included in Operations and maintenance expense on the Company’s Condensed Consolidated Statement of Income. No acquisition-related costs were incurred during the six months ended June 30, 2022 and no impacts to earnings resulted from the measurement-period adjustments reflected above. The Company has a transition services agreement with the sellers for a period of up to twelve months from the acquisition date of December 31, 2021, to continue certain corporate and administrative functions for the entities acquired while MountainWest is established as an independent enterprise.

32

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Southwest Gas Holdings, Inc. is a holding company that owns all of the shares of common stock of Southwest Gas Corporation (“Southwest” or the “natural gas distribution” segment), all of the shares of common stock of Centuri Group, Inc. (“Centuri,” or the “utility infrastructure services” segment), as well as all of the common stock of the newly formed MountainWest Pipelines Holding Company (“MountainWest,” or the “pipeline and storage” segment). Southwest Gas Holdings, Inc. and its subsidiaries are collectively referred to as the “Company.”

The Company completed the acquisition of Dominion Energy Questar Pipeline, LLC (“Questar Pipelines”) and related entities in December 2021. Following the acquisition, the Company formed MountainWest, which owns all of the membership interests of Questar Pipelines. In April 2022, the Company completed a general rebranding of the Questar Pipelines entities under the MountainWest name. The acquired operations further diversify the Company’s business including an essential Rocky Mountain energy hub with over 2,000 miles of highly contracted, FERC-regulated interstate natural gas pipelines providing transportation and underground storage services in Utah, Wyoming, and Colorado.

In October 2021, our Board of Directors (the “Board”) authorized and declared a dividend of one preferred stock purchase right for each share of common stock outstanding to stockholders of record at the close of business on October 21, 2021, in accordance with the terms and conditions set forth in the Rights Agreement.

In March 2022, the Company announced that the Board had determined to separate Centuri from the Company and authorized management to complete the separation within nine to twelve months from the date of such announcement. In April 2022, as a result of interest in the Company well in excess of a tender offer to other of our stockholders by an activist stockholder (affiliates of Carl C. Icahn), the Board authorized the review of a full range of strategic alternatives intended to maximize stockholder value. As part of this process, a strategic transactions committee of the Board, consisting entirely of independent directors, would evaluate a sale of the Company, as well as a range of alternatives, including, but not limited to, a separate sale of its business units and/or pursuing the spin-off of Centuri (collectively, the “Strategic Review”). On August 3, 2022, the Company announced that the Board had unanimously determined that the best path forward to maximize value for all stockholders is to (i) focus on the strategic plan and conclude the strategic review process for Southwest Gas Holdings, Inc. and Southwest Gas Corporation; (ii) continue to review strategic alternatives for MountainWest; and (iii) continue to review strategic alternatives for Centuri, including a sale or spin-off of Centuri. There can be no assurances that the strategic alternatives considered will be executed or maximize value as intended. See “Item 1A - Risk Factors” included elsewhere in this Quarterly Report on Form 10-Q.

As described in Note 1 – Background, Organization, and Summary of Significant Accounting Policies, on May 6, 2022, the Company entered into a Cooperation Agreement (“Cooperation Agreement”) with Carl C. Icahn and the persons and entities named therein (the “Icahn Group”). In accordance with the Cooperation Agreement, among other things, (i) Karen S. Haller has replaced John C. Hester as the Company’s President and Chief Executive Officer, (ii) the Icahn Group received the right to designate three directors to the Company’s Board, subject to certain ongoing ownership conditions, (iii) the Icahn Group agreed to consummate its previously announced tender offer for any and all shares of the Company’s common stock, which occurred on May 20, 2022, and (iv) the Icahn Group caused its affiliates to file a stipulation of dismissal with prejudice dismissing the action filed by them on November 29, 2021, which was entered by the Delaware Court of Chancery on May 9, 2022. See Note 1 – Background, Organization, and Summary of Significant Accounting Policies for more information. Separately, Justin L. Brown was appointed President of Southwest, while Ms. Haller assumed the role of Southwest’s Chief Executive Officer following the retirement of Mr. Hester from the same position.

Southwest is engaged in the business of purchasing, distributing, and transporting natural gas for customers in portions of Arizona, Nevada, and California. Southwest is the largest distributor of natural gas in Arizona and Nevada, and distributes and transports natural gas for customers in portions of California. Additionally, through its subsidiaries, Southwest operates two regulated interstate pipelines serving portions of the northern territories of Nevada and California.

As of June 30, 2022, Southwest had 2,174,000 residential, commercial, industrial, and other natural gas customers, of which 1,162,000 customers were located in Arizona, 808,000 in Nevada, and 204,000 in California. In January 2022, approximately 5,300 customers became part of Southwest’s gas distribution operations that were formerly served by Graham County Utilities (“GCU”). Over the past twelve months, first-time meter sets were approximately 39,000, compared to 37,000 for the twelve months ended June 2021. Residential and small commercial customers represented over 99% of the total customer base. During the twelve months ended June 30, 2022, 54% of operating margin (Regulated operations revenues less the net cost of gas sold) was earned in Arizona, 34% in Nevada, and 12% in California. During this same period, Southwest earned 85% of its operating margin from residential and small commercial customers, 4% from other sales customers, and 11% from transportation customers. These patterns are expected to remain materially consistent for the foreseeable future.

33

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Southwest recognizes operating revenues from the distribution and transportation of natural gas (and related services) to customers. Operating margin is a financial measure defined by management as Regulated operations revenues less the net cost of gas sold. However, operating margin is not specifically defined in accounting principles generally accepted in the United States (“U.S. GAAP”). Thus, operating margin is considered a non-GAAP measure. Management uses this financial measure because Regulated operations revenues include the net cost of gas sold, which is a tracked cost that is passed through to customers without markup under purchased gas adjustment (“PGA”) mechanisms. Fluctuations in the net cost of gas sold impact revenues on a dollar-for-dollar basis, but do not impact operating margin or operating income. Therefore, management believes operating margin provides investors and other interested parties with useful and relevant information to analyze Southwest’s financial performance in a rate-regulated environment. The principal factors affecting changes in operating margin are general rate relief (including impacts of infrastructure trackers) and customer growth. Commission decisions on the amount and timing of such relief may impact our earnings. Refer to the Summary Operating Results table below for a reconciliation of gross margin to operating margin, and refer to Rates and Regulatory Proceedings in this Management’s Discussion and Analysis, for details of various rate proceedings.

The demand for natural gas is seasonal, with greater demand in the colder winter months and decreased demand in the warmer summer months. All of Southwest’s service territories have decoupled rate structures (alternative revenue programs), which are designed to eliminate the direct link between volumetric sales and revenue, thereby mitigating the impacts of unusual weather variability and conservation on operating margin, allowing Southwest to pursue energy efficiency initiatives.

Centuri is a strategic infrastructure services company that partners with regulated utilities to build and maintain the energy network that powers millions of homes and businesses across the United States (“U.S.”) and Canada. With an unwavering commitment to serve as long-term partners to customers and communities, Centuri’s employees enable regulated utilities to safely and reliably deliver natural gas and electricity, as well as achieve their goals for environmental sustainability. Centuri operates in 70 primary locations across 45 states and provinces in the U.S. and Canada. Centuri operates in the U.S., primarily as NPL, Neuco, Linetec, and Riggs Distler, and in Canada, primarily as NPL Canada.

Utility infrastructure services activity can be impacted by changes in infrastructure replacement programs of utilities, weather, and local and federal regulation (including tax rates and incentives). Utilities continue to implement or modify system integrity management programs to enhance safety pursuant to federal and state mandates. These programs have resulted in multi-year utility system replacement projects throughout the U.S. Generally, Centuri revenues are lowest during the first quarter of the year due to less favorable winter weather conditions. Revenues typically improve as more favorable weather conditions occur during the summer and fall months. In cases of severe weather, such as following a regional storm, Centuri may be engaged to perform restoration activities related to above-ground utility infrastructure, and related results impacts are not solely within the control of management. In addition, in certain circumstances, such as with large bid contracts (especially those of a longer duration), or unit-price contracts with revenue caps, results may be impacted by differences between costs incurred and those anticipated when the work was originally bid. Work awarded, or failing to be awarded, by individual large customers can impact operating results.

MountainWest is an interstate natural gas transmission pipeline company that provides transportation and underground storage services to customers in Utah, Wyoming, and Colorado. A substantial portion of its revenue results from reservation charges, but variable rates are also included as part of its primarily rate-regulated rate structures.

While the novel coronavirus (“COVID-19”) pandemic has been ongoing since the first quarter of 2020, to date, there has not been a significant disruption in the Company’s supply chains, transportation network, or ability to serve customers. See Item 1A “Risk Factors - Operational Risks” in this Quarterly Report on Form 10-Q. The extent to which COVID-19 may adversely impact the Company’s business depends on future developments; however, management does not currently expect impacts to be material to the Company’s liquidity or financial position overall.

All of our businesses may be impacted by economic conditions that impact businesses generally, such as inflationary impacts on goods and services consumed in the business, labor markets and costs (including in regard to contracted or professional services), and the availability of those resources.

This Management’s Discussion and Analysis (“MD&A”) of Financial Condition and Results of Operations should be read in conjunction with the unaudited condensed consolidated financial statements and notes thereto included in this Quarterly Report on Form 10-Q and the audited financial statements and notes thereto, as well as MD&A, included in the 2021 Annual Report to Stockholders, which is incorporated by reference into the 2021 Form 10-K.

34

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Executive Summary

The items discussed in this Executive Summary are intended to provide an overview of the results of the Company’s and Southwest’s operations and are covered in greater detail in later sections of MD&A.

Summary Operating Results

	Period Ended June 30,
	Three Months				Six Months				Twelve Months
(In thousands, except per share amounts)	2022		2021		2022		2021		2022		2021
Contribution to net income
Natural gas distribution	$	(2,266)	$	11,413	$	109,529	$	130,128	$	166,536	$	193,705
Utility infrastructure services	4,741		15,116		(18,745)		14,257		7,418		73,056
Pipeline and storage	15,076		—		32,006		—		32,006		—
Corporate and administrative	(24,126)		(1,410)		(33,187)		(1,973)		(57,990)		(2,532)
Net income (loss)	$	(6,575)	$	25,119	$	89,603	$	142,412	$	147,970	$	264,229
Weighted average common shares	67,045		58,607		63,909		58,106		62,022		57,348
Basic earnings (loss) per share
Consolidated	$	(0.10)	$	0.43	$	1.40	$	2.45	$	2.39	$	4.61
Natural Gas Distribution
Reconciliation of Gross Margin to Operating Margin (Non-GAAP measure)
Utility Gross Margin	$	99,637	$	96,353	$	333,519	$	329,509	$	574,335	$	560,572
Plus:
Operations and maintenance (excluding Admin. & General) expense	75,721		62,316		149,143		126,373		289,930		248,719
Depreciation and amortization expense	55,930		57,631		128,044		126,329		255,113		243,701
Operating margin	$	231,288	$	216,300	$	610,706	$	582,211	$	1,119,378	$	1,052,992

2nd Quarter 2022 Overview

Southwest Gas Holdings highlights include the following:

•The Board continues to advance strategic alternatives for MountainWest and Centuri

•Corporate and administrative expenses include impact of interest on remaining $1.2 billion term loan, and shareholder activism/settlement and Strategic Review costs collectively totaling $22 million

Natural gas distribution highlights include the following:

•39,000 first-time meters sets occurred over the past 12 months

•Operating margin increased $15 million in the second quarter of 2022 compared to the prior year quarter, including the benefit of new general rates in Nevada effective April 1, 2022

•$152 million capital investment during the quarter

•Operations and maintenance expense includes $15 million of transitory costs for legal-related claims, uncollectible accounts, customer support system stabilization, and pipeline integrity management

•COLI results declined $8.3 million compared to the prior-year quarter

Utility infrastructure services highlights include the following:

•Record revenues of $706 million in the second quarter of 2022, an increase of $177 million, or 34%, compared to the second quarter of 2021

•Costs impacted by inflation, including higher fuel, subcontractor, and equipment rental costs

Pipeline and storage highlights include the following:

•Recognized revenue of $62 million in the second quarter of 2022

•Contributed $15 million to consolidated net income, net of $4.5 million of stand-up and integration costs

35

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Results of Natural Gas Distribution

Quarterly Analysis

	Three Months Ended June 30,
(Thousands of dollars)	2022		2021
Regulated operations revenues	$	377,942	$	292,796
Net cost of gas sold	146,654		76,496
Operating margin	231,288		216,300
Operations and maintenance expense	127,811		103,137
Depreciation and amortization	55,930		57,631
Taxes other than income taxes	20,098		19,338
Operating income	27,449		36,194
Other income (deductions)	(3,433)		(1,165)
Net interest deductions	28,633		24,175
Income before income taxes	(4,617)		10,854
Income tax benefit	(2,351)		(559)
Contribution to consolidated results	$	(2,266)	$	11,413

Contribution from natural gas distribution operations decreased $14 million between the second quarters of 2022 and 2021. The decline was primarily due to an increase in Operations and maintenance expense and Net interest deductions, partially offset by an increase in Operating margin.

Operating margin increased $15 million quarter over quarter. Approximately $4 million of incremental margin was attributable to customer growth, including 39,000 first-time meter sets during the last twelve months. Rate relief primarily in Nevada, and to a lesser extent in California, added $9 million of combined margin. Amounts collected from customers associated with previously unrecovered Vintage Steel Pipe (“VSP”) and Customer-Owned Yard Line (“COYL”) programs in Arizona ($6.4 million) also contributed to the improvement. Refer to Rates and Regulatory Proceedings later in this MD&A. Amounts attributable to recovery/return of other regulatory programs (which are also offset in Depreciation and amortization expense, thereby mitigating the impact to overall results) partially offset the other improvements in Operating margin. Other differences in miscellaneous revenue and margin from customers outside the decoupling mechanisms contributed to the remaining net variance between quarters.

Operations and maintenance expense increased $24.7 million between quarters. In addition to general inflationary impacts, specific increases include transitory costs for temporary/contractor services for customer and technology support ($1.6 million), contractor costs for event-driven pipeline integrity, reliability and engineering services ($2.5 million), an increase in the reserve for customer accounts deemed uncollectible ($2.2 million), and higher legal claim-related costs ($8.2 million). Additionally, employee labor and related costs (including the service component of pension costs) increased $2.5 million between quarters. The prior-year quarter expense levels included more modest expense levels overall due to COVID environment reduced training, travel, and related amounts.

Depreciation and amortization expense decreased $1.7 million, or 3%, between quarters, primarily due to a decrease in amortization related to regulatory account recoveries of approximately $5.5 million between quarters, which is also reflected in Operating margin above. Offsetting the decrease was additional expense as a result of a $542 million, or 6%, increase in average gas plant in service compared to the corresponding quarter a year ago. The increase in plant was attributable to pipeline capacity reinforcement work, franchise requirements, scheduled pipe replacement activities, and new infrastructure.

Other income decreased $2.3 million. The current quarter reflects a $5.2 million decline in COLI policy cash surrender values, while the prior-year quarter reflected a $3.1 million increase. These fluctuations primarily result from changes in the portion of the cash surrender values that are associated with equity securities, and are directionally consistent with the broader securities markets. This decrease was offset by non-service-related components of employee pension and other postretirement benefit costs, which decreased $3.3 million between quarters. Interest income increased $2 million between quarters due to the increased receivable position related to the Purchased Gas Adjustment mechanisms.

Net interest deductions increased $4.5 million in the second quarter of 2022, as compared to the prior-year quarter, primarily due to interest associated with the issuance of $300 million of Senior Notes issued in August 2021 and $600 million of Senior Notes in March 2022.

36

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Results of Natural Gas Operations

Six-Month Analysis

	Six Months Ended June 30,
(Thousands of dollars)	2022		2021
Gas operating revenues	$	1,054,481	$	814,728
Net cost of gas sold	443,775		232,517
Operating margin	610,706		582,211
Operations and maintenance expense	247,447		209,272
Depreciation and amortization	128,044		126,329
Taxes other than income taxes	41,750		40,025
Operating income	193,465		206,585
Other income (deductions)	(2,118)		(615)
Net interest deductions	55,243		46,341
Income before income taxes	136,104		159,629
Income tax expense	26,575		29,501
Contribution to consolidated results	$	109,529	$	130,128

Contribution from natural gas distribution operations to consolidated net income decreased $20.6 million between the first six months of 2022 and 2021. The decline was primarily due to increases in Operations and maintenance expense and Net interest deductions, partially offset by an increase in Operating margin.

Operating margin increased $28.5 million, including $11 million attributable to customer growth. Rate relief contributed an additional $10 million. Also contributing to the increase were customer late fees that were $3.4 million greater in the current period due to the lifting (in 2021) of a moratorium on such fees. The moratorium was previously in place beginning in March 2020 to provide temporary relief to customers during the COVID-19 pandemic. Amounts collected in the current period from customers associated with previously unrecovered VSP and COYL programs in Arizona totaled $11.7 million. Amounts related to the recovery/return associated with other regulatory programs partially offset these improvements; however, such amounts also reduced amortization expense. The residual difference in Operating margin relates to miscellaneous service revenue and customers that are not part of the decoupling mechanisms.

Operations and maintenance expense increased $38 million between periods primarily due to general inflationary impacts, including specific increases related to labor and related pension and benefit costs ($11.1 million), temporary/contractor services for customer and technology support ($2.9 million), contractor costs for pipeline integrity, reliability, and engineering ($3.1 million), an increase to the reserve for customer accounts deemed uncollectible ($2.1 million), higher legal claim-related costs ($8.2 million), as well as increases in other miscellaneous general expenses.

Depreciation and amortization expense increased $1.7 million, or 1%, between periods primarily due to a $552 million, or 7%, increase in average gas plant in service between periods, the impact of which was offset by reduced amounts ($6.2 million) associated with the return/recovery of regulatory account balances, compared to the first six months of 2021. The increase in plant was attributable to pipeline reinforcement work, franchise requirements, scheduled pipe replacement activities, and new infrastructure, as well as the implementation of the customer information system, which occurred in May 2021.

Taxes other than income taxes increased $1.7 million, or 4%, between periods primarily due to an increase in property taxes in Nevada and, to a lesser extent, in California.

Other income (deductions) decreased $1.5 million overall between periods. The current period reflects a $7.2 million decline in COLI policy cash surrender values, while the prior-year period reflected $5.8 million in income from the combined effects of an increase in COLI policy cash surrender values and recognized death benefits. Offsetting these impacts- were non-service cost components of employee pension and other postretirement benefits, which decreased $6.6 million between periods, and interest income, which increased $4 million between periods due to the increased receivable position of the PGA. Additionally, a gain of $1.5 million was recognized on the sale of non-regulated property in the first quarter of 2022.

Net interest deductions increased $8.9 million between periods, primarily due to higher interest associated with $300 million of Senior Notes issued in August 2021, $600 million of Senior Notes issued in March 2022, and the impacts of the variable rate $250 million March 2021 Term Loan.

37

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Results of Natural Gas Distribution

Twelve-Month Analysis

	Twelve Months Ended June 30,
(Thousands of dollars)	2022		2021
Regulated operations revenues	$	1,761,543	$	1,400,052
Net cost of gas sold	642,165		347,060
Operating margin	1,119,378		1,052,992
Operations and maintenance expense	476,725		413,246
Depreciation and amortization	255,113		243,701
Taxes other than income taxes	82,068		71,765
Operating income	305,472		324,280
Other income (deductions)	(6,062)		5,493
Net interest deductions	106,462		98,440
Income before income taxes	192,948		231,333
Income tax expense	26,412		37,628
Contribution to consolidated results	$	166,536	$	193,705

Contribution to consolidated net income from natural gas distribution operations decreased $27 million between the twelve-month periods ended June 2022 and 2021. The decline was due primarily to increases in Operations and maintenance expense, Depreciation and amortization, Taxes other than income taxes, and Net interest deductions, and a decrease in Other income (deductions), offset by an increase in Operating margin and a reduction to Income tax expense.

Operating margin increased $66 million between periods. Customer growth provided $16 million, and combined rate relief provided $38 million of incremental operating margin. Also contributing to the increase were customer late fees that were $6.7 million greater in the current period due to lifting the earlier moratorium on such fees in all jurisdictions. Approved VSP and COYL revenue in Arizona also contributed to the improvement between periods ($12 million). Offsetting these increases are amounts associated with the return/recovery of regulatory account balances ($4.5 million between periods), which is mitigated by a decrease in amortization expense (discussed below).

Operations and maintenance expense increased $63 million between periods. In addition to general inflationary impacts, specific increases include temporary/contractor services for customer and technology support services ($7.2 million), employee labor and related pension and benefit costs ($21.1 million), contractor costs for pipeline integrity, reliability, and engineering services ($4.5 million), an increase in the reserve for customer accounts deemed uncollectible ($2.4 million), higher legal claim-related costs ($13.9 million) (including legal reserves as described in Note 1 – Background, Organization, and Summary of Significant Accounting Policies), and other general expense increases overall. The prior year expense levels were uncharacteristically low due to COVID-period reduced training/travel and other cost savings.

Depreciation and amortization expense increased $11.4 million, or 5%, between periods primarily due to a $561 million, or 7%, increase in average gas plant in service since the corresponding period in the prior year, offset by a reduction in amortization of regulatory account balances, as discussed in regard to Operating margin above. The increase in gas plant was attributable to pipeline capacity reinforcement work, franchise requirements, scheduled pipe replacement activities, and new infrastructure, as well as the implementation of a new customer information system placed into production in the second quarter of 2021.

Taxes other than income taxes increased $10.3 million between periods primarily due to an increase in property taxes in Arizona, and to a lesser extent, in California and Nevada.

Other income decreased $11.6 million between the twelve-month periods of 2022 and 2021, primarily due to a current-period decline in COLI policy cash surrender values of $4.2 million, compared to the twelve months ended June 30, 2021, which reflected an increase in values of $18.5 million (including $3.5 million of net death benefits). Additionally, equity AFUDC was lower by $2.4 million, due to the impact short-term borrowings have on AFUDC rates. Offsetting these impacts were non-service cost components of employee pension and other postretirement benefit costs, which were $9.6 million lower between periods, and interest income, which increased $5 million between periods. The gain on sale of non-regulated property, noted earlier, also impacted the variance between periods.

Net interest deductions increased $8 million between periods primarily due to increased interest associated with $300 million of Senior Notes issued in August 2021 and, to a lesser extent, $600 million of Senior Notes issued in March 2022.

38

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Income tax expense decreased $11.2 million between the twelve-month periods ended June 30, 2022 and 2021, primarily due to a reduction in pre-tax book income, additional amortization of excess accumulated deferred income taxes (“EADIT”) ($3.5 million), and to a lesser extent, changes in Arizona and California state apportionment percentages of $2.9 million. Income tax expense in both periods reflects that COLI results are recognized without tax consequences.                                        

Results of Utility Infrastructure Services

Quarterly Analysis

	Three Months Ended June 30,
(Thousands of dollars)	2022		2021
Utility infrastructure services revenues	$	706,090	$	528,625
Operating expenses:
Utility infrastructure services expenses	646,193		478,640
Depreciation and amortization	38,863		25,217
Operating income	21,034		24,768
Other income (deductions)	(147)		(146)
Net interest deductions	12,598		1,632
Income before income taxes	8,289		22,990
Income tax expense	3,054		6,519
Net income	5,235		16,471
Net income attributable to noncontrolling interests	494		1,355
Contribution to consolidated results	$	4,741	$	15,116

Utility infrastructure services revenues increased $177.5 million in the second quarter of 2022 when compared to the prior-year quarter, including $150.4 million from Riggs Distler. Revenues from electric infrastructure services increased $82.1 million in the second quarter of 2022 when compared to the prior-year quarter, of which $67.8 million was recorded by Riggs Distler. The current quarter increase also included approximately $72 million in gas infrastructure services revenues, including $17.7 million recorded by Riggs Distler, primarily from increased volumes under master service agreements. Certain ancillary revenue was lower in the current period, offsetting these impacts. Work mix and volume were negatively impacted during the second quarter of 2022 due to certain customers’ supply chain challenges in procuring necessary materials and equipment.

Utility infrastructure services expenses increased $167.6 million in the second quarter of 2022 when compared to the prior-year quarter. The overall increase includes $135 million incurred by Riggs Distler in 2022, and incremental costs related to the higher volume of infrastructure services provided. Changes in mix of work and inflation led to higher input costs including fuel and subcontractor expenses, as well as increased project related travel and equipment rental costs incurred by the electric infrastructure business. Fuel costs increased $10.9 million in the current quarter, including $2.6 million incurred by Riggs Distler. Increased project related travel expenses of $3.9 million were incurred during the period. Also included in total Utility infrastructure services expenses were general and administrative costs, which increased approximately $5.4 million between quarters, including $4 million of general and administrative costs incurred by Riggs Distler and $2.2 million of Strategic Review costs. Other administrative costs increased due to the continued growth in the business. Gains on sale of equipment in the second quarter of 2022 and 2021 (reflected as an offset to Utility infrastructure services expenses) were approximately $1.6 million and $2.5 million, respectively.

Depreciation and amortization expense increased $13.6 million between quarters, of which $13.1 million was recorded by Riggs Distler. The remaining increase was attributable to equipment purchased to support the growing volume of infrastructure work.

The increase in Net interest deductions of $11 million was primarily due to incremental outstanding borrowings under Centuri’s $1.545 billion amended and restated secured revolving credit and term loan facility in conjunction with the acquisition of Riggs Distler.

Income tax expense decreased $3.5 million between quarters, primarily due to reduced profitability in 2022.

39

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Results of Utility Infrastructure Services

Six-Month Analysis

	Six Months Ended June 30,
(Thousands of dollars)	2022		2021
Utility infrastructure services revenues	$	1,229,967	$	892,600
Operating expenses:
Utility infrastructure services expenses	1,149,425		814,254
Depreciation and amortization	76,475		49,961
Operating income	4,067		28,385
Other income (deductions)	(633)		(248)
Net interest deductions	23,729		3,254
Income (loss) before income taxes	(20,295)		24,883
Income tax expense (benefit)	(3,116)		7,719
Net income (loss)	(17,179)		17,164
Net income attributable to noncontrolling interest	1,566		2,907
Contribution to consolidated results	$	(18,745)	$	14,257

Utility infrastructure services revenues increased $337.4 million in the first six months of 2022 when compared to the same period in the prior year, including $264.2 million recorded by Riggs Distler in 2022. Revenues from electric infrastructure services increased $170.1 million in 2022 when compared to the prior year, of which $135.3 million was recorded by Riggs Distler. Included in electric infrastructure services revenues overall during the first six months of 2022 was $19 million from emergency restoration services performed by Linetec and Riggs Distler following tornados and other storm damage to customers’ above-ground utility infrastructure in and around the Gulf Coast and eastern regions of the U.S., compared to $12.2 million in the first six months of the prior year. Centuri’s revenues derived from storm-related services vary from period to period due to the unpredictable nature of weather-related events, and when this type of work is performed, it typically generates a higher profit margin than core infrastructure services, due to improved operating efficiencies related to equipment utilization and absorption of fixed costs. The current year increase also included approximately $110.8 million in gas infrastructure services revenues, including $31.3 million recorded by Riggs Distler, primarily from increased volumes under master service agreements. Certain ancillary revenue was lower in the current period, offsetting these increases. Work mix and volume were negatively impacted during the first six months of 2022 due to certain customers’ supply chain challenges in procuring necessary materials and equipment.

Utility infrastructure services expenses increased $335.2 million in the first six months of 2022 when compared to the same period in the prior year. The overall increase includes $239.1 million incurred by Riggs Distler in 2022, and incremental costs related to the higher volume of infrastructure services provided. Changes in mix of work and inflation led to higher input costs including fuel and subcontractor expenses. Within our electric infrastructure business, we incurred higher equipment rental and tooling costs in support of growth along with higher project related travel costs. Fuel costs increased $18.1 million in the current year, including $4.9 million incurred by Riggs Distler. Increased project related travel expenses of $5.9 million were incurred during the current period. Also included in total Utility infrastructure services expenses were general and administrative costs, which increased $12.5 million in 2022 compared to 2021, including $7.9 million of general and administrative costs incurred by Riggs Distler, as well as $2.2 million of Strategic Review costs. Other administrative costs increased due to the continued growth in the business. Gains on sale of equipment (reflected as an offset to Utility infrastructure services expenses) were approximately $2 million and $4 million in the six-month periods in 2022 and 2021, respectively.

Depreciation and amortization expense increased $26.5 million between periods, of which $25.4 million was recorded by Riggs Distler in 2022. The remaining increase was attributable to equipment purchased to support the growing volume of infrastructure work.

The increase in Net interest deductions of $20.5 million during the first six months of 2022 was primarily due to incremental outstanding borrowings under Centuri’s $1.545 billion amended and restated secured revolving credit and term loan facility in conjunction with the acquisition of Riggs Distler.

40

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Results of Utility Infrastructure Services

Twelve-Month Analysis

	Twelve Months Ended June 30,
(Thousands of dollars)	2022		2021
Utility infrastructure services revenues	$	2,496,028	$	2,012,582
Operating expenses:
Utility infrastructure services expenses	2,290,638		1,794,145
Depreciation and amortization	144,157		99,746
Operating income	61,233		118,691
Other income (deductions)	682		(300)
Net interest deductions	41,474		7,384
Income before income taxes	20,441		111,007
Income tax expense	7,941		30,762
Net income	12,500		80,245
Net income attributable to noncontrolling interests	5,082		7,189
Contribution to consolidated results	$	7,418	$	73,056

Utility infrastructure services revenues increased $483.4 million in the current twelve-month period compared to the corresponding period of 2021, including $428.1 million recorded by Riggs Distler subsequent to its acquisition on August 27, 2021. Revenues from electric infrastructure services increased $259.5 million in 2022 when compared to the prior year, of which $243.3 million was recorded by Riggs Distler. Included in the incremental electric infrastructure revenues during the twelve-month period of 2022 was $72.1 million from emergency restoration services performed by Linetec and Riggs Distler, following hurricane, tornado, and other storm damage to customers’ above-ground utility infrastructure in and around the Gulf Coast and eastern regions of the U.S., as compared to $86.5 million in similar services during the twelve-month period in 2021. The remaining increase in revenue was attributable to continued growth with existing gas infrastructure customers under master service and bid agreements, partially offset by reduced work with a significant customer during the twelve-month period ending June 30, 2022 (totaling $30 million), due to the mix of projects under its multi-year capital spending program. Work mix and volume were negatively impacted during the current twelve-month period due to certain customers’ supply chain challenges in procuring necessary materials and equipment.

Utility infrastructure services expenses increased $496.5 million between periods (including $14 million of professional fees related to the acquisition of Riggs Distler). The increase overall includes $384 million incurred by Riggs Distler subsequent to the acquisition, as well as incremental costs related to electric infrastructure services work and costs necessary for the completion of additional gas infrastructure work. Higher fuel costs, equipment rental expense, and subcontractor expenses were also incurred due to inflation, the mix of work, and in support of growth in our electric infrastructure business. Expenses in relation to revenues, and therefore, profit margins, can be impacted by inefficiencies from equipment and facility utilization and under-absorption of other fixed costs, which occurred due to the reduced work from the noted large customer and lower revenues from emergency restoration services as noted above. Also included in total Utility infrastructure services expenses were general and administrative costs, which increased approximately $30.9 million between comparative periods, including $14 million of acquisition-related professional fees previously noted and $17.3 million of general and administrative costs incurred by Riggs Distler subsequent to the acquisition. Gains on sale of equipment (reflected as an offset to Utility infrastructure services expenses) were approximately $4.8 million and $5.6 million for the twelve-month periods of 2022 and 2021, respectively.

Depreciation and amortization expense increased $44.4 million between the current and prior-year twelve-month periods, of which $42.2 million was recorded by Riggs Distler subsequent to the acquisition. The remaining increase was attributable to equipment and computer systems purchased to support the growing volume of infrastructure work.

Net interest deductions increased $34.1 million between periods due to incremental outstanding borrowings under Centuri’s $1.545 billion amended and restated secured revolving credit and term loan facility in conjunction with the acquisition of Riggs Distler.

Income tax expense decreased $22.8 million between periods, primarily due to reduced profitability in 2022.

41

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Results of Pipeline and Storage

Quarterly and Six-Month Analysis

	Three Months Ended June 30,		Six Months Ended June 30,
(Thousands of dollars)	2022
Regulated operations revenues	$	62,088	$	129,081
Operating expenses:
Net cost of gas sold	1,206		3,003
Operations and maintenance expense	24,741		49,053
Depreciation and amortization	13,217		26,137
Taxes other than income taxes	2,508		5,672
Operating income	20,416		45,216
Other income (deductions)	795		1,338
Net interest deductions	4,514		8,896
Income before income taxes	16,697		37,658
Income tax expense	1,621		5,652
Contribution to consolidated results	$	15,076	$	32,006

Operating results for the Pipeline and Storage segment included rate-regulated transmission and subscription storage revenues of $57.8 million and $118.9 million during the three- and six-months ended June 30, 2022. Operating expenses include $4.5 million and $13.2 million, during the three- and six-month periods, respectively, ended June 30, 2022, related to integrating MountainWest, including employee retention payments incurred during the first quarter of 2022. Additional integration costs will be incurred in future periods until integration efforts are completed. The effective tax rates for the three- and six-months ended June 30, 2022 are lower than the statutory rate primarily due to the amortization of EADIT.

Rates and Regulatory Proceedings

Southwest is subject to the regulation of the Arizona Corporation Commission (the “ACC”), the Public Utilities Commission of Nevada (the “PUCN”), the California Public Utilities Commission (the “CPUC”), and the Federal Energy Regulatory Commission (the “FERC”). Due to the size of Southwest’s regulated operations and the frequency of rate cases and other procedural activities with its commissions, the following discussion focuses primarily on the proceedings within its natural gas distribution operations.

General Rate Relief and Rate Design

Rates charged to customers vary according to customer class and rate jurisdiction and are set by the individual state and federal regulatory commissions that govern Southwest’s service territories. Southwest makes periodic filings for rate adjustments as the cost of providing service changes (including the cost of natural gas purchased), and as additional investments in new or replacement pipeline and related facilities are made. Rates are intended to provide for recovery of all commission-approved costs and a reasonable return on investment. The mix of fixed and variable components in rates assigned to various customer classes (rate design) can significantly impact the operating margin actually realized by Southwest. Management has worked with its regulatory commissions in designing rate structures that strive to provide affordable service to its customers while mitigating volatility in prices to customers and stabilizing returns to investors. Such rate structures were in place in all of Southwest’s operating areas during all periods for which results of natural gas distribution operations are disclosed above.

Arizona Jurisdiction

Arizona General Rate Case. In December 2021, Southwest filed a general rate case application proposing a revenue increase of approximately $90.7 million. Although updated rates related to the previous rate case became effective in January 2021, the most significant driver for the new request is the necessity to reflect in rates the substantial capital investments that have been made since the end of the test year in the previous case, including the customer information system implemented in May 2021. The current filing is based on a test year ended August 31, 2021 and proposes a return on common equity of 9.90% relative to a target equity ratio of 51%. Recovery (over three years) of the approximately $12 million related to the outstanding deferral balance associated with the LNG facility (see below) is included in the request, along with the approximate $2.1 million (also over three years) in late payment charges that were suppressed from customer accounts during the COVID-19 pandemic. A

42

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

request to continue the Delivery Charge Adjustment (“DCA”), Southwest’s full-revenue decoupling mechanism, is also included, while no changes to Southwest’s existing rate design are proposed. A decision is anticipated by the end of 2022, with new rates expected to be effective in the first quarter of 2023.

Delivery Charge Adjustment. The DCA is filed each April, which along with other reporting requirements, contemplates a rate to recover the over- or under-collected margin tracker (decoupling mechanism) amounts based on the balance at the end of the reporting period. An April 2022 request proposed a rate to return $10.5 million, the over-collected balance existing at the end of the first quarter 2022, which was approved effective July 1, 2022.

Tax Reform. In the most recently concluded Arizona general rate proceeding, a Tax Expense Adjustor Mechanism (“TEAM”) was approved to timely recognize tax rate changes resulting from federal or state tax legislation following the TEAM implementation. In addition, the TEAM tracks and returns/recovers the revenue requirement impact of changes in amortization of EADIT (including that which resulted from 2017 U.S. federal tax reform) compared to the amount authorized in the most recently concluded rate case. In December 2021, Southwest filed its inaugural TEAM rate application for the recovery of approximately $4.3 million associated with the mechanism. The ACC staff is expected to issue its report on the filing for commission consideration at a subsequent open meeting.

Liquefied Natural Gas (“LNG”) Facility. In 2014, Southwest sought ACC preapproval to construct, operate, and maintain a 233,000 dekatherm LNG facility in southern Arizona. This facility is intended to enhance service reliability and flexibility related to natural gas deliveries in the southern Arizona area by providing a local storage option, connecting directly to Southwest’s distribution system. Southwest was ultimately granted approval for construction and deferral of costs. The facility was placed in service in December 2019. The capital costs and the operating expenses associated with plant operation were approved and considered as part of Southwest’s previous general rate case. Approximately $12 million in costs, incurred following the in-service date of the facility and after the period considered as part of the previous general rate case, were deferred in the previously authorized regulatory asset account and are included for consideration in the current general rate case application.

Customer-Owned Yard Line (“COYL”) Program. Southwest originally received approval, in connection with its 2010 Arizona general rate case, to implement a program to conduct leak surveys, and if leaks were present, to replace and relocate service lines and meters for Arizona customers whose meters were set off from the customer’s home, representing a non-traditional configuration. A filing in May 2021 proposed the recovery of previously unrecovered surcharge revenue from 2019 and 2020 (collectively, $13.7 million) over a one-year period. In November 2021, the ACC approved full recovery within the proposed timeline, the rate for which was implemented the same month. In a February 2022 filing, Southwest requested and received approval to increase its surcharge revenue by $3.4 million to recover the revenue requirement associated with previous investments made since August 2020 and through calendar year 2021. The rate was implemented in June 2022.

Vintage Steel Pipe (“VSP”) Program. Southwest received approval, in connection with its 2016 Arizona general rate case, to implement a VSP replacement program, due to having a substantial amount of pre-1970s vintage steel pipe in Arizona. However, as part of Southwest’s most recent rate case decision in 2020, the ACC ultimately decided to discontinue the accelerated VSP program. A filing in May 2021 proposed the recovery of previously unrecovered surcharge revenue relating to investments during 2019 and 2020, with approximately $60 million to be recovered over a three-year period. In November 2021, the ACC approved full recovery over the proposed three-year timeline with updated rates which became effective in March 2022.

Graham County Utilities. In April 2021, Southwest and Graham County Utilities, Inc. (“GCU”) filed a joint application with the ACC for approval to transfer assets of GCU to Southwest and extend Southwest’s Certificate of Public Convenience and Necessity to serve the more than 5,000 associated customers, for a purchase price of $3.5 million. Approval of the application by the ACC was received in December 2021, with final transfer in mid-January 2022. Former GCU customers continue to be served under existing GCU rates until such time as they are rolled into Southwest’s rates, which is proposed to take place in conjunction with the effective date of rates resulting from the currently pending Arizona general rate case.

California Jurisdiction

California General Rate Case. In August 2019, Southwest filed a general rate case based on a 2021 test year, seeking authority to increase rates in its California rate jurisdictions, after being granted earlier permission to extend the rate case cycle by two years and continue its 2.75% previously approved Post-Test Year (“PTY”) attrition adjustments for 2019 and 2020.

Southwest reached an agreement in principle with the Public Advocate’s Office, which was unanimously approved by the CPUC on March 25, 2021, including a $6.4 million total combined revenue increase with a 10% return on common equity, relative to a 52% equity ratio. Approximately $4 million of the original proposed increase was associated with a North Lake Tahoe project that would not ultimately be completed by the beginning of 2021; consequently, the parties agreed to provide for

43

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

recovery of the cost of service impacts of the project through the annual attrition filing. The rate case decision maintains Southwest’s existing 2.75% annual attrition adjustments and the continuation of the pension balancing account. It also includes cumulative expenditures totaling $119 million over the five-year rate cycle to implement risk-informed proposals, consisting of a school COYL replacement, meter protection, and pipe replacement programs. Although new rates were originally anticipated to be in place by January 1, 2021, due to an administrative delay, new rates were ultimately implemented April 1, 2021. In light of this delay, Southwest was granted authority to establish a general rate case memorandum account to track the impacts related to the delay in the implementation of new rates for purposes of later recovery, which began January 1, 2022.

Attrition Filing. Following the 2021 implementation of rates approved as part of the general rate case, Southwest is also authorized to implement annual PTY attrition increases of 2.75%, the first annual adjustment of which began in January 2022.

Customer Data Modernization Initiative (“CDMI”). In April 2019, Southwest filed an application with the CPUC seeking authority to establish a two-way, interest-bearing balancing account to record costs associated with the CDMI to mitigate adverse financial implications associated with this multi-year project (including a new customer information system, ultimately implemented in May 2021). Effective October 2019, the CPUC granted a memorandum account, which allowed Southwest to track costs, including operations and maintenance costs and capital-related costs, such as depreciation, taxes, and return associated with California’s portion of the CDMI (initially estimated at $19 million). The balance tracked in the memorandum account was transferred to the two-way balancing account in July 2020. A rate to begin recovering the balance accumulated through June 30, 2020 was established and made effective September 1, 2020, and updated multiple times since, including in January 2022. This rate is expected to be updated at least annually.

Carbon Offset Program. In March 2022, Southwest filed an application to seek approval to offer a voluntary program to California customers to purchase carbon offsets in an effort to provide customers additional options to reduce their respective GHG emissions. A request to establish a two-way balancing account to track program-related costs and revenues was included as part of the application. Southwest anticipates a decision in 2023.

Nevada Jurisdiction

Nevada General Rate Case. On August 31, 2021, Southwest filed its most recent general rate case, which was further updated by a certification filing on December 17, 2021. The request proposed a combined revenue increase of approximately $28.7 million (as of certification); the most significant driver for the new request is the necessity to reflect in rates the substantial capital investments that have been made since the end of the test year in the previous case, including the customer information system that was implemented in May 2021. The filing included a proposed return on common equity of 9.90% with a target equity ratio of 51%; recovery over two years of approximately $6.6 million in previously deferred late payment charges related to a regulatory asset associated with COVID-19; and continuation of full revenue decoupling under the General Revenues Adjustment (“GRA”) mechanism. The filing utilized a test year ended May 31, 2021 with certification-period adjustments through November 30, 2021. On February 7, 2022, the parties filed a stipulation with the PUCN, providing for a statewide revenue increase of $14.05 million, a return on common equity of 9.40% relative to a 50% target equity ratio, and continuation of Southwest’s full revenue decoupling mechanism. The stipulation was approved by the PUCN, and new rates became effective April 1, 2022. The PUCN’s order did not include recovery of the approximate $6.6 million in deferred late payment charges related to a regulatory asset associated with COVID-19, which had previously been reserved.

General Revenues Adjustment. As noted above, the continuation of the GRA was affirmed as part of Southwest’s most recent general rate case with an expansion to include a large customer class (with average monthly throughput requirements greater than 15,000 therms), effective April 2022. Southwest makes Annual Rate Adjustment (“ARA”) filings to update rates to recover or return amounts associated with various regulatory mechanisms, including the GRA. Southwest made its most recent ARA filing in November 2021 related to balances as of September 30, 2021. New rates related to that filing became effective July 1, 2022. While there is no impact to net income overall from adjustments to recovery rates associated with the related regulatory balances, operating cash flows are impacted by such changes.

COYL Program. In August 2021, Southwest filed a joint petition with the Regulatory Operations Staff of the PUCN proposing a Nevada COYL replacement program to include residential COYLs, public school COYLs, and any other COYLs that are identified to be a safety concern. The petition was approved in January 2022 and provides for capital investments up to $5 million per year for five years and the establishment of a regulatory asset to track the capital-related costs. After five years, the program will be reassessed to determine if it should be continued.

Infrastructure Replacement Mechanism. In 2014, the PUCN approved final rules for the Gas Infrastructure Replacement (“GIR”) mechanism, which provided for the deferral and recovery of certain costs associated with accelerated replacement of qualifying infrastructure that would not otherwise provide incremental revenues between general rate cases. Associated with the replacement of various types of pipe infrastructure under the mechanism (Early Vintage Plastic Pipe, COYL, and VSP), the

44

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

related regulations provide Southwest with the opportunity to file a GIR “Advance Application” annually to seek preapproval of qualifying replacement projects.

In cases where preapproval of projects is requested and granted, a GIR rate application is separately filed to reset the GIR recovery surcharge rate related to previously approved and completed projects. On September 30, 2021, Southwest filed its latest rate application to reset the recovery surcharge to include cumulative deferrals through August 31, 2021. The updated surcharge rate is expected to result in an annual revenue decrease of approximately $1.4 million in southern Nevada and an annual revenue increase of $66,000 in northern Nevada. The parties reached a stipulation that was approved by the PUCN and new rates became effective January 1, 2022.

Conservation and Energy Efficiency. The PUCN allows deferral (and later recovery) of approved conservation and energy efficiency costs, recovery rates for which are adjusted in association with ARA filings. In its November 2021 ARA filing, Southwest proposed annualized margin decreases of $574,000 and $434,700 for southern and northern Nevada, respectively, which became effective in July 2022. In May 2022, Southwest filed an application seeking approval of its annual Conservation and Energy Efficiency Plan Report for 2021, with no proposed modifications to the previously approved $1.3 million annual budget for years 2022-2024. The parties reached a stipulation that was approved by the PUCN in July 2022.

Expansion and Economic Development Legislation. In January 2016, final regulations were approved by the PUCN associated with legislation (“SB 151”) previously introduced and signed into law in Nevada. The legislation authorized natural gas utilities to expand their infrastructure to provide service to unserved and underserved areas in Nevada.

In November 2017, Southwest filed for preapproval of a project to extend service to Mesquite, Nevada, in accordance with the SB 151 regulations. Ultimately, the PUCN issued an order approving Southwest’s proposal for the expansion, and Southwest provides periodic updates and adjusts the rates to recover the revenue requirement associated with the investments to serve customers as part of Southwest’s ARA filings and rate case proceedings. As of June 2022, approximately 40 miles of natural gas infrastructure has been installed throughout the Mesquite expansion area.

In June 2019, Southwest filed for preapproval to construct the infrastructure necessary to expand natural gas service to Spring Creek, near Elko, Nevada, and to implement a cost recovery methodology to recover the associated revenue requirement consistent with the SB 151 regulations. The expansion facilities consist of a high-pressure approach main and associated regulator stations, an interior backbone, and an extension of the distribution system from the interior backbone. The total capital investment was estimated to be $61.9 million. A stipulation was reached with the parties and approved by the PUCN in December 2019, including a rate recovery allocation amongst northern Nevada, Elko, and Spring Creek expansion customers. Construction began in the third quarter of 2020, and service commenced to the first Spring Creek customers in December 2020. As of June 2022, approximately 36 miles of natural gas infrastructure has been installed throughout the Spring Creek expansion area, and is anticipated to be completed in 2026.

Carbon Offset Program. In June 2021, Southwest filed an application seeking approval to offer a voluntary program to northern and southern Nevada customers to purchase carbon offsets in an effort to provide customers additional options to reduce their respective GHG emissions. A request to establish a regulatory asset to track program-related costs and revenues was included as part of the application. The parties reached a stipulation that was approved by the PUCN in December 2021 approving Southwest’s proposal. Implementation of the program is underway with customer participation expected in the third quarter of 2022.

FERC Jurisdiction

General Rate Case. In 2020, Great Basin Gas Transmission Company (“Great Basin”), a wholly owned subsidiary of Southwest, reached an agreement in principle with the FERC Staff providing that its three largest transportation customers and all storage customers would be required to have primary service agreement terms of at least five years, that term-differentiated rates would continue generally, and included a 9.90% pre-tax rate of return. Interim rates were made effective February 2020. As part of the settlement, Great Basin will file a rate case no later than May 31, 2025.

PGA Filings

The rate schedules in all of Southwest’s service territories contain provisions that permit adjustment to rates as the cost of purchased gas changes. These deferred energy provisions and purchased gas adjustment clauses are collectively referred to as “PGA” clauses. Differences between gas costs recovered from customers and amounts paid for gas by Southwest result in over- or under-collections. Balances are recovered from or refunded to customers on an ongoing basis with interest. As of June 30, 2022, under-collections in each of Southwest’s service territories resulted in an asset of $355 million on the Company’s and Southwest’s Condensed Consolidated Balance Sheets. See also Deferred Purchased Gas Costs in Note 1 – Background, Organization, and Summary of Significant Accounting Policies in this quarterly report on Form 10-Q.

45

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Filings to change rates in accordance with PGA clauses are subject to audit by state regulatory commission staffs. PGA changes impact cash flows, but have no direct impact on operating margin. However, gas cost deferrals and recoveries can impact comparisons between periods of individual consolidated income statement components. These include Regulated operations revenues, Net cost of gas sold, Net interest deductions, and Other income (deductions).

The following table presents Southwest’s outstanding PGA balances receivable/(payable):

(Thousands of dollars)	June 30, 2022		December 31, 2021		June 30, 2021
Arizona	$	254,319	$	214,387	$	194,107
Northern Nevada	10,488		12,632		417
Southern Nevada	89,426		55,967		35,865
California	338		8,159		4,715
	$	354,571	$	291,145	$	235,104

Not included in the PGA balances table above are $5 million at June 30, 2022 and $5.7 million at December 31, 2021 in deferred purchased gas cost liabilities for MountainWest.

Capital Resources and Liquidity

Historically, cash on hand and cash flows from operations have provided a substantial portion of cash used in investing activities (primarily for construction expenditures and property additions). In recent years, Southwest has undertaken significant pipe replacement activities to fortify system integrity and reliability, including on an accelerated basis in association with certain gas infrastructure replacement programs. This activity has necessitated the issuance of both debt and equity securities to supplement cash flows from operations. The Company, in executing on its plans to fund the MountainWest acquisition, initially funded the transaction through short-term borrowings, which would be refinanced through a multi-pronged permanent financing plan, some of which was executed during the first quarter of 2022 as the Company used $452 million in net proceeds from its underwritten offering of common stock to repay a portion of such short-term borrowings. In advance of full plan deployment, current liabilities are in excess of current assets creating a working capital deficit, which will be alleviated once management completes its execution on the remainder of its plan. The Company’s capitalization strategy is to maintain an appropriate balance of equity and debt to preserve investment-grade credit ratings, which help minimize interest costs. Investment-grade credit ratings have been maintained following the acquisition.

Cash Flows

Southwest Gas Holdings, Inc.:

Operating Cash Flows. Cash flows from consolidated operating activities increased $262 million in the first six months of 2022 as compared to the same period of 2021. The improvement in cash flows primarily resulted from the change in purchased gas costs, including amounts incurred and deferred, as well as impacts related to when amounts are incorporated in customer bills to recover or return deferred balances. The prior period included a $50 million incremental contribution to the noncontributory qualified retirement plan (reflected as a change in other liabilities and deferred credits). Other impacts include benefits from depreciation and changes and components of working capital overall.

The corporate and administrative expenses/outflows for Southwest Gas Holdings, Inc. in the six- and twelve-month periods ended June 30, 2022 include outlays related to shareholder activism and the Strategic Review, in addition to outlays related to expenditures/financing costs for the MountainWest acquisition.

Investing Cash Flows. Cash used in consolidated investing activities increased $44 million in the first six months of 2022 as compared to the same period of 2021. The change was primarily due to an increase in capital expenditures in both the natural gas distribution and utility infrastructure services segments. The current period also included a post-closing payment of $18.8 million in association with the MountainWest acquisition.

Financing Cash Flows. Net cash provided by consolidated financing activities decreased $189 million in the first six months of 2022 as compared to the same period of 2021. The change was primarily due to borrowings by Southwest in the first six months of 2021, including the March 2021 Term Loan to finance a gas cost runup caused by the freeze event in and around the central U.S. due to Winter Storm Uri, as well as borrowings under the Company’s credit facility; by comparison, in the first six months of 2022, financing activities were largely undertaken in concert with reductions in other borrowings. The Company reduced its 364-day Term Loan facility (utilized to finance the MountainWest acquisition) through net proceeds of $452 million from the issuance of common stock in an underwritten public offering in the current period. Proceeds from equity issuances by the holding company were lower in 2021 (and were contributed to Southwest in that period). Furthermore, while debt proceeds were received by Southwest’s issuance of $600 million in notes, it also redeemed, in February 2022, $25 million 7.78% series

46

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Medium-term notes then maturing, as well as $250 million in notes maturing in April 2022. Southwest also repaid (during 2022) $25 million of amounts outstanding on the March 2021 Term Loan utilized to finance the gas cost runup in 2021. Outstanding amounts under the long-term portion of Southwest’s facility were also paid down during 2022 ($130 million). The holding company had higher borrowings under its credit facility in the current period given its expenditures for shareholder activism and settlement activities, along with the Strategic Review. Centuri’s line of credit and term loan facility borrowings during the first six months of 2021 exceeded amounts in the current period. Dividends paid in 2022 were also higher than during the comparative period in 2021.

The capital requirements and resources of the Company generally are determined independently for the individual business segments. Each business segment is generally responsible for securing its own financing sources. However, the holding company may raise funds through stock issuances or other external financing sources in support of each business segment.

Southwest Gas Corporation:

Operating Cash Flows. Cash flows provided by operating activities increased $270 million in the first six months of 2022 as compared to the same period of 2021. The improvement in operating cash flows was primarily attributable to the impacts related to deferred purchased gas costs (described above), as well as to other working capital changes. While gas costs incurred were higher in both periods compared to earlier recent historical periods, the first six months of 2021 included unusual/excessive increases in costs over a number of days in February 2021 amidst the freeze event from Winter Storm Uri. While gas costs incurred in the first six months of 2021 were higher, collections from customers in the 2022 period increased over the six-month period of 2021, which includes the effects of when gas costs are incorporated into customer rates.

Investing Cash Flows. Cash used in investing activities increased $8 million in the first six months of 2022 as compared to the same period of 2021. The change was primarily due to increases in capital expenditures in 2022 partly offset by an increase in customer advances as compared to the same period in the prior year. See also Gas Segment Construction Expenditures and Financing below.

Financing Cash Flows. Net cash provided by financing activities decreased $195 million in the first six months of 2022 as compared to the same period of 2021. The decline was primarily due to the impacts cited above. The 2021 period included proceeds to finance gas purchases during Winter Storm Uri; by comparison, in 2022, financing proceeds were largely offset by debt repayments. Southwest issued $600 million in notes in the first quarter of 2022, and paid down amounts then outstanding under its credit facility and redeemed $250 million in notes maturing in April 2022. It also redeemed $25 million 7.78% series Medium-term notes that matured in February 2022, and $25 million of amounts outstanding under the March 2021 Term Loan used to fund increased gas purchased costs during the 2021 freeze event. See Note 5 – Debt. Furthermore, parent capital contributions from equity issuances made in 2021 have not recurred in 2022, while dividends paid to the parent holding company were higher in the current period.

Gas Segment Construction Expenditures, Debt Maturities, and Financing

During the twelve-month period ended June 30, 2022, construction expenditures for the natural gas distribution segment were $619 million (not including amounts incurred for capital expenditures not yet paid). The majority of these expenditures represented costs associated with the replacement of existing transmission, distribution, and general plant to fortify system integrity and reliability.

Management estimates natural gas segment construction expenditures during the five-year period ending December 31, 2026 will be approximately $2.5 billion to $3.5 billion. Of this amount, approximately $600 million to $650 million is expected to be incurred in 2022. Southwest plans to continue to request regulatory support to undertake projects, or to accelerate projects as necessary, for the improvement of system flexibility and reliability, or to expand, where relevant, to unserved or underserved areas. Southwest may expand existing, or initiate new, programs. Significant replacement activities are expected to continue well beyond the next few years. See also Rates and Regulatory Proceedings. During the three-year period, cash flows from operating activities of Southwest are expected to provide approximately 69% of the funding for gas operations of Southwest and total construction expenditures and dividend requirements. As of June 30, 2022, Southwest had the March 2021 Term Loan with an outstanding balance of $225 million, due in March 2023. Any additional cash requirements, including construction-related, and pay down or refinancing of debt, are expected to be provided by existing credit facilities, equity contributions from the Company, and/or other external financing sources. The timing, types, and amounts of additional external financings will be dependent on a number of factors, including the cost of gas purchases, conditions in capital markets, timing and amounts of rate relief, timing and amounts of surcharge collections from, or amounts returned to, customers related to other regulatory mechanisms and programs, as well as growth levels in Southwest’s service areas and earnings. External financings may include the issuance of debt securities, bank and other short-term borrowings, and other forms of financing.

47

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Dividend Policy

Dividends are payable on the Company’s common stock at the discretion of the Board. In setting the dividend rate, the Board currently targets a payout ratio of 55% to 65% of consolidated earnings per share and considers, among other factors, current and expected future earnings levels, our ongoing capital expenditure plans, expected external funding needs, and our ability to maintain investment-grade credit ratings and liquidity. The Company has paid dividends on its common stock since 1956 and has increased that dividend each year since 2007. In February 2022, the Board elected to increase the quarterly dividend from $0.595 to $0.62 per share, representing a 4.2% increase, effective with the June 2022 payment.

Liquidity

Several factors (some of which are out of the control of the Company) that could significantly affect liquidity in the future include: variability of natural gas prices, changes in ratemaking policies of regulatory commissions, regulatory lag, customer growth in the natural gas distribution segment, the ability to access and obtain capital from external sources, interest rates, changes in income tax laws, pension funding requirements, inflation, and the level of earnings. Natural gas prices and related gas cost recovery rates, as well as plant investment, have historically had the most significant impact on liquidity.

On an interim basis, Southwest defers over- or under-collections of gas costs to PGA balancing accounts. In addition, Southwest uses this mechanism to either refund amounts over-collected or recoup amounts under-collected as compared to the price paid for natural gas during the period since the last PGA rate change went into effect. At June 30, 2022, the combined balance in the PGA accounts totaled an under-collection of $355 million. See PGA Filings for more information.

In March 2022, Southwest amended the $250 million March 2021 Term Loan, extending the maturity date to March 21, 2023. As noted above, the proceeds were originally used to fund the increased cost of natural gas supply during the month of February 2021 caused by extreme weather conditions in the central U.S. The March 2021 Term Loan was extended as a result of the current gas cost environment and management’s funding plans for purchases. At June 30, 2022, there was $225 million outstanding under the March 2021 Term Loan.

In March 2022, Southwest issued $600 million aggregate principal amount of 4.05% Senior Notes at a discount of 0.65%. The notes will mature in March 2032. Southwest used the net proceeds to redeem $250 million 3.875% notes due in April 2022 and to repay outstanding amounts under its credit facility, with the remaining net proceeds used for general corporate purposes.

Southwest has a credit facility, with a borrowing capacity of $400 million, which expires in April 2025. Southwest designates $150 million of the facility for long-term borrowing needs and the remaining $250 million for working capital purposes. The maximum amount outstanding on the long-term portion of the credit facility (including a commercial paper program) during the first six months of 2022 was $150 million. The maximum amount outstanding on the short-term portion of the credit facility during the first six months of 2022 was $85 million. As of June 30, 2022, no borrowings were outstanding on the short-term or long-term portions of this credit facility. The credit facility can be used as necessary to meet liquidity requirements, including temporarily financing under-collected PGA balances, or meeting the refund needs of over-collected balances. The credit facility has been adequate for Southwest’s working capital needs outside of funds raised through operations and other types of external financing. As indicated, any additional cash requirements would include the existing credit facility, equity contributions from the Company, and/or other external financing sources.

Southwest has a $50 million commercial paper program. Any issuance under the commercial paper program is supported by Southwest’s current revolving credit facility and, therefore, does not represent additional borrowing capacity. Any borrowing under the commercial paper program during 2022 will be designated as long-term debt. Interest rates for the commercial paper program are calculated at the current commercial paper rate during the borrowing term. At June 30, 2022, there were no borrowings outstanding under this program.

Centuri has a senior secured revolving credit and term loan facility. The line of credit portion comprises $400 million; associated amounts borrowed and repaid are available to be re-borrowed. The term loan facility portion provided approximately $1.145 billion in financing. The term loan facility expires on August 27, 2028 and the revolving credit facility expires on August 27, 2026. This multi-currency facility allows the borrower to request loan advances in either Canadian dollars or U.S. dollars. The obligations under the credit agreement are secured by present and future ownership interests in substantially all direct and indirect subsidiaries of Centuri, substantially all of the tangible and intangible personal property of each borrower, certain of their direct and indirect subsidiaries, and all products, profits, and proceeds of the foregoing. Centuri assets securing the facility at June 30, 2022 totaled $2.5 billion. The maximum amount outstanding on the combined facility during the first six months of 2022 was $1.2 billion. As of June 30, 2022, $146 million was outstanding on the revolving credit facility, in addition to $1.01 billion that was outstanding on the term loan portion of the facility. Also at June 30, 2022, there was approximately $190 million, net of letters of credit, available for borrowing under the line of credit.

48

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

Southwest Gas Holdings, Inc. has a credit facility with a borrowing capacity of $200 million that expires in December 2026. This facility is intended for short-term financing needs. At June 30, 2022, $90 million was outstanding under this facility.

In November 2021, the Company entered into a $1.6 billion delayed-draw Term Loan Facility that was funded on December 31, 2021 in connection with the acquisition of MountainWest. This term loan matures on December 30, 2022. There was $1.15 billion outstanding under this Term Loan Facility as of June 30, 2022, included in the total of $1.46 billion of total short-term debt as of June 30, 2022. Current maturities of $41 million on the balance sheet as of that date relate to Centuri. These conditions contributed to a negative working capital position of $707 million as of June 30, 2022, and the Company does not currently have sufficient liquidity or capital resources to repay this debt at maturity without issuing new debt or equity. In March 2022, the Company used net proceeds from the issuance of common stock (see below) to repay a portion of borrowings under the Term Loan Facility. Management intends to pay off the remainder of the Term Loan Facility through the issuance of long-term debt, or extend the Term Loan Facility up to 364 days. However, management maintains the discretion to seek alternative sources, and can provide no assurances as to its ability to refinance this obligation with the intended method or on attractive terms.

In March 2022, the Company sold, through a prospectus supplement under its Universal Shelf program, an aggregate of 6.325 million shares of common stock, with an underwritten public offering price of $74.00 per share, resulting in proceeds to the Company of $452.2 million, net of the underwriters’ discount of $15.8 million. The Company used the net proceeds to repay a portion of the outstanding borrowings under the 364-day Term Loan Facility that was used to initially fund the MountainWest acquisition.

In April 2021, the Company entered into a Sales Agency Agreement between the Company and BNY Mellon Capital Markets, LLC and J.P. Morgan Securities LLC (the “Equity Shelf Program”) for the offer and sale of up to $500 million of common stock from time to time in at-the-market offerings under the related prospectus supplement filed with the Securities and Exchange Commission (the “SEC”) the same month. There was no activity under this multi-year program during the second quarter of 2022. Net proceeds from the sales of shares of common stock under the Equity Shelf Program are intended for general corporate purposes, including the acquisition of property for the construction, completion, extension, or improvement of pipeline systems and facilities located in and around the communities served by Southwest, as well as for repayment or repurchase of indebtedness (including amounts outstanding from time to time under the credit facilities, senior notes, Term Loan or future credit facilities), and to provide for working capital. The Company had approximately $341.8 million available under the program as of June 30, 2022.

During the twelve months ended June 30, 2022, 1,251,810 shares were issued in at-the-market offerings under the foregoing program at an average price of $70.15 per share with gross proceeds of $87.8 million, agent commissions of $0.9 million, and net proceeds of $86.9 million under the equity shelf program noted above. See Note 4 – Common Stock for more information.

Interest rates for the Company’s Term Loan Facility and Centuri’s credit facility contain LIBOR-based rates. Certain LIBOR-based rates were scheduled to be discontinued as a benchmark or reference rate after 2021, while other LIBOR-based rates are scheduled to be discontinued after June 2023. As of June 30, 2022, the Company had $2.16 billion in aggregate outstanding borrowings under Centuri’s credit facility and the Company’s Term Loan Facility. In order to mitigate the impact of a LIBOR discontinuance on the Company’s financial condition and results of operations, management will monitor developments and work with lenders, where relevant, to determine the appropriate replacement/alternative reference rate for variable rate debt. At this time the Company can provide no assurances as to the impact a LIBOR discontinuance will have on its financial condition or results of operations. Any alternative rate may be less predictable or less attractive than LIBOR.

Forward-Looking Statements

This quarterly report contains statements which constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995 (“Reform Act”). All statements other than statements of historical fact included or incorporated by reference in this quarterly report are forward-looking statements, including, without limitation, statements regarding the Company’s plans, objectives, goals, intentions, projections, strategies, future events or performance, negotiations, and underlying assumptions. The words “may,” “if,” “will,” “should,” “could,” “expect,” “plan,” “anticipate,” “believe,” “estimate,” “predict,” “project,” “continue,” “forecast,” “intend,” “endeavor,” “promote,” “seek,” and similar words and expressions are generally used and intended to identify forward-looking statements. For example, statements regarding plans to review strategic alternatives to maximize stockholder value, refinance near-term maturities, to separate Centuri or other entities from the Company, those regarding operating margin patterns, customer growth, the composition of our customer base, price volatility, seasonal patterns, payment of debt, the Company’s COLI strategy, replacement market and new construction market, our intent and ability to complete planned acquisitions or divestitures and at amounts originally set out, impacts from the COVID-19 pandemic, including on our employees, customers, or otherwise, our financial position, revenue, earnings, cash flows, debt covenants, operations, regulatory recovery, work deployment or resumption and related uncertainties stemming

49

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

from this pandemic or otherwise, expected impacts of valuation adjustments associated with any redeemable noncontrolling interest, the profitability of storm work, mix of work, or absorption of fixed costs by larger infrastructure services customers including Southwest, the impacts of U.S. tax reform including disposition in any regulatory proceeding and bonus depreciation tax deductions, the impact of recent Pipeline and Hazardous Materials Safety Administration rulemaking, the amounts and timing for completion of estimated future construction expenditures, plans to pursue infrastructure programs or programs under SB 151 legislation, forecasted operating cash flows and results of operations, net earnings impacts or recovery of costs from gas infrastructure replacement and COYL programs and surcharges, funding sources of cash requirements, amounts generally expected to be reflected in future period revenues from regulatory rate proceedings including amounts requested or settled from recent and ongoing general rate cases or other regulatory proceedings, rates and surcharges, PGA administration and recovery, and other rate adjustments, sufficiency of working capital and current credit facilities, bank lending practices, the Company’s views regarding its liquidity position, ability to raise funds and receive external financing capacity and the intent and ability to issue various financing instruments and stock under the existing at-the-market equity program or otherwise, future dividend increases and the Board’s current target dividend payout ratio, pension and postretirement benefits, certain impacts of tax acts, the effect of any other rate changes or regulatory proceedings, contract or construction change order negotiations, impacts of accounting standard updates, statements regarding future gas prices, gas purchase contracts and pipeline imbalance charges or claims related thereto, recoverability of regulatory assets, the impact of certain legal proceedings or claims, and the timing and results of future rate hearings, including any ongoing or future general rate cases and other proceedings, and the final resolution for recovery of the CDMI-related amounts and balances in any jurisdiction, and statements regarding pending approvals are forward-looking statements. All forward-looking statements are intended to be subject to the safe harbor protection provided by the Reform Act.

A number of important factors affecting the business and financial results of the Company could cause actual results to differ materially from those stated in the forward-looking statements. These factors include, but are not limited to, customer growth rates, conditions in the housing market, the impacts of COVID-19 including that which may result from a continued or resumed restriction by government officials or otherwise, including impacts on employment in our territories, impacts related to supply chains, the health impacts to our customers and employees due to the virus or virus variants or efficacy of vaccines, the ability to collect on customer accounts due to the suspension or lifted moratorium on late fees or service disconnection in any or all jurisdictions, the ability of the infrastructure services business to resume or continue work with all customers and the impact of a delay or termination of work as a result thereof, the impacts of future restrictions placed on our business by government regulation or otherwise, the impact of a resurgence of the virus or its variants, and decisions of Centuri customers (including Southwest) as to whether to pursue capital projects due to economic impacts resulting from the pandemic or otherwise, the effects of regulation/deregulation, governmental or regulatory policy regarding pipeline safety, greenhouse gas emissions, natural gas or alternative energy, the regulatory support for ongoing infrastructure programs or expansions, the timing and amount of rate relief, the timing and methods determined by regulators to refund amounts to customers resulting from U.S. tax reform, changes in rate design, variability in volume of gas or transportation service sold to customers, changes in gas procurement practices and prices, impacts of inflation, changes in capital requirements and funding, the impact of credit rating actions and conditions in the capital markets on financing costs, the impact of variable rate indebtedness with or without a discontinuance of LIBOR including in relation to amounts of indebtedness then outstanding, changes in construction expenditures and financing, levels of or changes in operations and maintenance expenses, or other costs, including fuel costs and other costs impacted by inflation or otherwise, geopolitical influences on the business or its costs, effects of pension or other postretirement benefit expense forecasts or plan modifications, accounting changes and regulatory treatment related thereto, currently unresolved and future liability claims and disputes, changes in pipeline capacity for the transportation of gas and related costs, results of Centuri bid work, the impact of weather on Centuri’s operations, projections about acquired business’ earnings or those planned (including accretion within the first twelve months or other periods) and future acquisition-related costs, the timing and magnitude of costs necessary to integrate and stand up newly acquired operations, administration, and systems, and the ability to complete stand-up for MountainWest prior to the expiration of the transition services agreement, the ability to attract, hire, and maintain necessary staff and management for our collective operations, impacts of changes in value of any redeemable noncontrolling interest if at other than fair value, Centuri utility infrastructure expenses, differences between actual and originally expected outcomes of Centuri bid or other fixed-price construction agreements, outcomes from contract and change order negotiations, ability to successfully procure new work and impacts from work awarded or failing to be awarded from significant customers (collectively, including from Southwest), the mix of work awarded, the amount of work awarded to Centuri following the lifting of work stoppages or reduction, the result of productivity inefficiencies from regulatory requirements or otherwise, delays in commissioning individual projects, acquisitions and divestitures and management’s plans related thereto, the ability of management to successfully finance, close, and assimilate acquired businesses, the impact on our stock price or our credit ratings due to undertaking or failing to undertake acquisition activity or other strategic endeavors, the impact on our stock price, costs, or businesses from the stock rights program, actions or disruptions of significant shareholders and costs related thereto, competition, our ability to raise capital in external financings, our ability to continue to remain within

50

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

the ratios and other limits subject to our debt covenants, and ongoing evaluations in regard to goodwill and other intangible assets. In addition, the Company can provide no assurance that its discussions regarding certain trends or plans relating to its financing and operating expenses will continue, proceed as planned, or cease to continue in future periods. For additional information on the risks associated with the Company’s business, see Item 1A. Risk Factors and Item 7A. Quantitative and Qualitative Disclosures About Market Risk in the Annual Report on Form 10-K for the year ended December 31, 2021.

All forward-looking statements in this quarterly report are made as of the date hereof, based on information available to the Company and Southwest as of the date hereof, and the Company and Southwest assume no obligation to update or revise any of its forward-looking statements, even if experience or future changes show that the indicated results or events will not be realized. We caution you not to unduly rely on any forward-looking statement(s).

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

See Item 7A. Quantitative and Qualitative Disclosures about Market Risk in the 2021 Annual Report on Form 10-K filed with the SEC. No material changes have occurred related to the disclosures about market risk.

ITEM 4. CONTROLS AND PROCEDURES

Management of Southwest Gas Holdings, Inc. and Southwest Gas Corporation has established disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) that are designed to provide reasonable assurance that information required to be disclosed in their respective reports filed or submitted under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and forms and to provide reasonable assurance that such information is accumulated and communicated to management of each company, including each respective Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosures. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Further, the design of a control system must reflect the fact that there are resource constraints, and benefits of controls must be considered relative to their costs. Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or management override of the control. Because of the inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and may not be detected.

Based on the most recent evaluation, as of June 30, 2022, management of Southwest Gas Holdings, Inc. and Southwest Gas Corporation, including the Chief Executive Officer and Chief Financial Officer, believes the Company’s and Southwest’s disclosure controls and procedures are effective at attaining the level of reasonable assurance noted above.

There have been no changes in the Company’s or Southwest’s internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) of the Exchange Act) during the second quarter of 2022 that have materially affected, or are likely to materially affect the Company’s internal control over financial reporting.

PART II - OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

The Company and Southwest are named as a defendant in various legal proceedings. The ultimate dispositions of these proceedings are not presently determinable; however, it is the opinion of management that none of this litigation individually or in the aggregate will have a material adverse impact on the Company’s or Southwest’s financial position or results of operations. See Contingency within Note 1 – Background, Organization, and Summary of Significant Accounting Policies for ongoing and dismissed litigation, including litigation filed by certain stockholders and by funds managed by Carl C. Icahn.

ITEM 1A. Described below is a risk factor that we have identified that may have a negative impact on our future financial performance or affect whether we achieve the goals or expectations expressed or implied in any forward-looking statements contained herein. This risk factor supplements, and does not replace, the Risk Factors and other disclosures made in our Annual Report on Form 10-K filed March 1, 2022 and our Quarterly Report on Form 10-Q filed May 10, 2022.

Operational Risks

Challenges relating to current supply chain constraints have negatively impacted Centuri’s work mix and volumes and could adversely impact our results of operations overall.

Due to increased demand across a range of industries, the global supply market for certain customer-provided components, including, but not limited to, electric transformers and gas risers needed to complete customer projects at Centuri, has experienced isolated performance constraint and disruption in recent periods in support of a few customers. This constrained supply environment has adversely affected, and could further affect, customer-provided component availability, lead times and cost, and could increase the likelihood of unexpected cancellations or delays of supply of key components to customers, thereby

51

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

leading to delays in Centuri’s ability to timely deliver projects to customers. In an effort to mitigate these risks, Centuri has redirected efforts to projects whereby the customer has provided necessary materials, but delays in materials and redirecting workforces can lead to inefficiencies in absorption of fixed costs, higher labor costs for teams waiting to be deployed, and delays in pivoting to projects where necessary materials are available. Centuri’s efforts to adapt quickly or redeploy to other projects may fail to reduce the impact of these adverse supply chain conditions on Centuri’s business.

Despite these mitigation efforts, the constrained supply conditions may adversely impact Centuri’s revenues and results of operations. At the same time, increased costs associated with fuel, labor, equipment rental, and other job costs may adversely impact Centuri’s gross margin, profitability, and ability to complete customer projects in a manner consistent with prior periods. The COVID-19 pandemic, labor market, and conflict in Ukraine have also contributed to and exacerbated this strain within and outside the U.S., and there can be no assurance that these impacts on the supply chain will not continue, or worsen, in the future, negatively impacting any of our business segments and their results. The current supply chain challenges could also result in increased use of cash, engineering design changes, and delays in the completion of customer or other capital projects, each of which could adversely impact our business and results of operations for Centuri, Southwest, or MountainWest. In the event these supply chain challenges persist for the foreseeable future, these conditions could adversely impact our results of operations and financial condition over an extended period.

ITEMS 2 through 3. None.

ITEM 4. MINE SAFETY DISCLOSURES Not applicable.

ITEM 5. OTHER INFORMATION None.

52

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

ITEM 6. EXHIBITS

The following documents are filed, or furnished, as applicable, as part of this report on Form 10-Q:

Exhibit 4.01	-	Amendment No. 1 to Rights Agreement, dated May 9, 2022, between Southwest Gas Holdings, Inc. and Equiniti Trust Company, as Rights Agent. Incorporated herein by reference to Exhibit 4.01 to Form 8-K dated May 10, 2022. File Nos. 001-37976 and 001-07850.
Exhibit 10.1	-	Cooperation Agreement, dated as of May 6, 2022, by and among the Icahn Group and Southwest Gas Holdings, Inc. Incorporated herein by reference to Exhibit 10.1 to Form 8-K dated May 10, 2022. File Nos. 001-37976 and 001-07850.
Exhibit 10.2 # **		Severance Agreement and General Release, dated June 6, 2022, by and between John P. Hester, Southwest Gas Holdings, Inc. and Southwest Gas Corporation.
Exhibit 10.3 # **	-	Amended and Restated Award Agreement for the Centuri Group, Inc. Long-Term Incentive Plan.
Exhibit 31.01#	-	Section 302 Certifications–Southwest Gas Holdings, Inc.
Exhibit 31.02#	-	Section 302 Certifications–Southwest Gas Corporation
Exhibit 32.01#	-	Section 906 Certifications–Southwest Gas Holdings, Inc.
Exhibit 32.02#	-	Section 906 Certifications–Southwest Gas Corporation
Exhibit 101#	-	The following materials from the Quarterly Report on Form 10-Q of Southwest Gas Holdings, Inc. and Southwest Gas Corporation for the quarter ended June 30, 2022, were formatted in Inline XBRL (Extensible Business Reporting Language): (1) Southwest Gas Holdings, Inc. and Subsidiaries Condensed Consolidated Balance Sheets, (ii) Southwest Gas Holdings, Inc. and Subsidiaries Condensed Consolidated Statements of Income, (iii) Southwest Gas Holdings, Inc. and Subsidiaries Condensed Consolidated Statements of Comprehensive Income, (iv) Southwest Gas Holdings, Inc. and Subsidiaries Condensed Consolidated Statements of Cash Flows, (v) Southwest Gas Holdings, Inc. and Subsidiaries Condensed Consolidated Statements of Equity, (vi) Southwest Gas Corporation and Subsidiaries Condensed Consolidated Balance Sheets, (vii) Southwest Gas Corporation and Subsidiaries Condensed Consolidated Statements of Income, (viii) Southwest Gas Corporation and Subsidiaries Condensed Consolidated Statements of Comprehensive Income, (ix) Southwest Gas Corporation and Subsidiaries Condensed Consolidated Statements of Cash Flows, (x) Southwest Gas Corporation and Subsidiaries Condensed Consolidated Statements of Equity. The instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
104#		Cover Page Interactive Data File (embedded within the Inline XBRL document).
# Filed herewith.
** Management Contract or Compensation Plan

53

SOUTHWEST GAS HOLDINGS, INC.	Form 10-Q
SOUTHWEST GAS CORPORATION	June 30, 2022

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Southwest Gas Holdings, Inc.

(Registrant)

Dated: August 9, 2022

/s/ LORI L. COLVIN

Lori L. Colvin

Vice President/Controller and Chief Accounting Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Southwest Gas Corporation

(Registrant)

Dated: August 9, 2022

/s/ LORI L. COLVIN

Lori L. Colvin

Vice President/Controller and Chief Accounting Officer

54

EX-10.02

SEVERANCE AGREEMENT AND GENERAL RELEASE

This Severance Agreement and General Release (“Agreement”) is entered into by and between John P. Hester (“Executive”), Southwest Gas Corporation (“SWG”), and Southwest Gas Holdings, Inc. (“SWX”). SWG and SWX are hereinafter referred to as the “Company.” Executive and the Company are at times hereinafter referred to individually as “Party” and collectively as the “Parties.”

WHEREAS, Executive was hired by the Company on June 2, 1989and currently holds the title of President and Chief Executive Officer;

WHEREAS, as part of his employment relationship with the Company, Executive has served as a member of the SWX Board of Directors since 2015;

WHEREAS, Executive and the Company have agreed that Executive shall retire and resign his employment and his membership on the SWX Board of Directors effective May 31, 2022 (the “Separation Date”);

WHEREAS, Executive and the Company intend to settle and resolve any and all claims and disputes that either Party may have against the other, arising from, or in any way related to, the employment relationship between Executive and the Company or the termination of said employment relationship.

NOW, THEREFORE, in consideration for the promises, payments, and benefits described in this Agreement, Executive and the Company each execute this Agreement in favor of and for the benefit of the other as follows:

1.Separation.

(a)Until the Separation Date, Executive shall: (i) continue to abide by all of the Company’s general policies and procedures in effect from time to time; (ii) not initiate communication with any Company employees other than Thomas E. Moran, Karen S. Haller or Sharon W. Braddy-McKoy without the Company’s consent; and (iii) not remove, delete, or copy any Company documents or information without the Company’s consent, which consent, if given, to be given by Thomas E. Moran or Karen S. Haller. Regardless of whether Executive signs this Agreement, the Company will pay Executive all Accrued Benefits within five business days of the Separation Date. For purposes of this Agreement, "Accrued Benefits" means any earned but unpaid base salary, unused vacation and all expense reimbursement payments owed to Executive for expenses incurred prior to the Separation Date.

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2.Severance Benefits.

In consideration for Executive’s covenants and agreements contained in this Agreement, and provided Executive (i) signs and returns this Agreement by June 7, 2022, at 5:00 p.m. PST (the “Deadline”), (ii) does not revoke it,; (iii) executes the Affirmation of Severance Agreement and General Release (“Affirmation”) attached as Exhibit A hereto on or within seven calendar days after the Separation Date and does not revoke it, and (iii) has complied and continues to comply with all terms and conditions herein and in the Affirmation, and his confidentiality, restrictive covenants and other obligations to the Company in this Agreement and the continuing obligations, including under Sections 4, 5, and 6, of the Amended and Restated Change In Control Agreement between Executive and the Company dated February 23, 2018 (the “CIC Agreement”), the Company will provide, in addition to the Accrued Benefits, the following benefits to Executive on the following terms and as described in this Section 2:

(b)The Company will pay Executive the total sum of $2,458,714, which includes (i) an amount equal to Executive’s base salary from the Separation Date to December 31, 2022, plus six (6) months’ additional salary (together, equal to $1,303,492), (ii) an amount equal to Executive’s 2022 target bonus under the Company’s Management Incentive Plan (equal to $1,129,696), and (iii) an amount equal to the total cost of continuing medical, dental and vision coverages for Executive and Executive’s dependents in accordance with the continuation requirements of the Consolidated Omnibus Budget Reconciliation Act (“COBRA”) for the eighteen (18) month period following the end of the month of the Separation Date (such amount estimated to be approximately $25,526) (collectively, the “Severance Benefits”). The Severance Benefits are subject to required payroll taxes and other withholdings and deductions, and shall be payable within five business days after the Affirmation Effective Date (as defined in the Affirmation). The Severance Benefits satisfy the short-term deferral rule of Treasury Regulation Section 1.409-1(a)(4) and, therefore are not “deferred compensation” subject to the terms of Section 409A of the Internal Revenue Code of 1986, as amended (the “Code”).

(c)The shares of the Company’s common stock underlying Executive’s outstanding time-lapse restricted stock units issued under the Award Agreements of Time-Lapse Restricted Stock Units between the Company and Executive dated February 24, 2020, February 24, 2021, and February 24, 2022 (the “Time-Based RSU Agreements”), will settle in accordance with Sections 4 and 6 of the Time-Based RSU Agreements on the date that is six months following

2

the Separation Date. For the sake of clarity, Executive’s retirement shall be deemed a “Retirement” on or after becoming “Retirement Eligible” (as those terms are defined in the Time-Based Award Agreements) consistent with Section 4 of the Time-Based RSU Agreements, and Executive shall be deemed to be fully vested in all Units granted under the Time-Based RSU Agreements.

(d)The shares of the Company’s common stock underlying Executive’s outstanding performance share awards issued under the Performance Share Award Agreements between the Company and Executive dated February 24, 2020, February 24, 2021, and February 24, 2022 (the “Performance-Based RSU Agreements”) will settle in accordance with Section 7(b) of the Performance-Based RSU Agreements. For the sake of clarity, Executive’s retirement shall be deemed a “Retirement” as that term is defined in the Performance-Based RSU Agreements.

(e)Any distribution due to Executive under the Company’s Executive Deferred Compensation Plan (“EDP”), the Supplemental Employee Retirement Plan (“SERP”), the Retirement Plan for Employees of Southwest Gas Corporation and the Southwest Gas Corporation Employee Investment Plan shall be made in accordance with plan documents and Code Section 409A.

(f)Assuming this Agreement is made effective and not revoked, the Company will reimburse Executive up to $15,000 for Holland & Knight LLP’s reasonable attorneys’ fees and costs actually incurred by Executive in relation to drafting and the negotiation of this Agreement, to be paid within 30 days after the Separation Date, subject to timely and sufficient substantiation per the Company’s applicable policies and practices.

3.Releases.

(g)In consideration for the Company’s covenants and promises stated in this Agreement, Executive hereby forever releases and discharges the Company, its subsidiaries and affiliated entities, and each of their past, present and future officers, directors, stockholders, agents, employees, insurers, reinsurers, successors and assigns, both individually and in their business capacities, and their employee benefit plans and programs and their administrators and fiduciaries (collectively the “Released Parties”), from any and all complaints, charges, rights, claims, liabilities, demands, debts, accounts, obligations, promises, suits, actions, causes of action, and/or demands, including claims for damages, attorneys’ fees or costs, whether in law or equity, whether known or unknown, fixed or contingent, accrued or unaccrued, liquidated or

3

unliquidated, which Executive now has or claims to have, or which Executive at any time may have had or claimed to have, or which Executive at any time hereafter may have, or claim to have, arising at any time in the past to and including the date of this Agreement, including, but without limiting the generality of the foregoing, any matters relating in any way to Executive’s employment relationship or the termination of that employment relationship with the Company (each, a “Claim” and, collectively, “Claims”).

(h)The Claims, rights and obligations that Executive is releasing hereunder include, but are not limited to: (i) those for wrongful discharge, breach of contract, breach of implied contract, breach of implied covenant of good faith and fair dealing, and any other common law or statutory claims now or hereinafter recognized; and (ii) those for discrimination (including but not limited to claims for discrimination, harassment or retaliation on account of sex, age, medical condition or disability, national origin, race, color, religion, sexual orientation, or veteran status) which Executive might have or might have had under Title VII of the Civil Rights Act of 1964, the Age Discrimination in Employment Act, the Fair Labor Standards Act, the Civil Rights Act of 1991, the Equal Pay Act, the Americans With Disabilities Act, the Family and Medical Leave Act, the Nevada Equal Opportunities for Employment Law — Nev. Rev. Stat. § 613.310, et seq.; the Nevada Equal Pay Law — Nev. Rev. Stat. § 608.017, Nevada Wage Payment and Work Hour Law — Nev. Rev. Stat. § 608, et seq., and the Nevada Occupational Safety & Health Act — Nev. Rev. Stat. § 618, et seq. and any other federal, state or local laws prohibiting discrimination, harassment or retaliation in employment.

BY SIGNING THIS AGREEMENT, EXECUTIVE AGREES TO GIVE UP OR WAIVE ANY RIGHTS OR CLAIMS WHICH HE MAY HAVE UNDER THE AGE DISCRIMINATION IN EMPLOYMENT ACT OF 1967.29 U.S.C. 4621 et. seq., OR ANY OTHER STATUTE OR OTHER LAW, WHICH IS BASED ON ACTIONS OF THE RELEASED PARTIES WHICH OCCURRED UP THROUGH THE DATE THAT EXECUTIVE SIGNS THIS AGREEMENT.

(i)Executive further acknowledges and agrees that, except as modified below in this Section 3, this Agreement and the Affirmation shall operate as a complete bar to recovery in any and all litigation, charges, Claims, complaints, grievances or demands of any kind whatsoever now pending or now contemplated by Executive, or which might at any time be filed by Executive or on Executive’s behalf, including, but without limiting the generality of the

4

foregoing, any and all matters arising out of or in any manner whatsoever connected with the matters set forth in Section 3 (a) or (b) above. Each and all of the said Claims are hereby fully and finally settled, compromised and released.

(j)Nothing in this Agreement or the Affirmation is intended to or shall interfere with Executive’s right to file a charge with or participate, testify, or assist in any investigation, hearing, or other proceeding with any appropriate federal, state or local government agency enforcing discrimination laws, nor shall this Agreement prohibit Executive from cooperating with agency in its investigation. Executive shall not, however, to the maximum extent permitted by law be entitled to receive any relief, recovery or monies in connection with any Claim brought against any of the Released Parties, regardless of who filed or initiated any such complaint, charge or proceeding.

(k)If any claim is not subject to release, to the extent permitted by law, Executive waives any right or ability to be a class or collective action representative or to otherwise participate in any putative or certified class, collective or multi-party action or proceeding based on such a claim in which the Company or any other Released Parties identified in this Agreement is a party.

(l)Nothing in this Section 3 is intended to operate as a release, waiver or forfeiture of Executive’s rights, and the Company’s obligations, under:

(1)this Agreement;

(2)any of the Company’s employee benefits plans in which Executive has been a participant, including, but not limited to, the Retirement Plan for Employees of the Company, EDP, and SERP, if applicable, and the Company’s Employees’ Investment Plan, as to Executive’s own vested accrued employee benefits under such health, welfare, or retirement benefit plans as of the Separation Date;

(3)any health and welfare benefits to which Executive may in the future be entitled under COBRA or comparable federal or state law or regulations, including Executive’s entitlement to payments for COBRA benefits as described in Section 2(a) of this Agreement;

(4)any state workers’ compensation act or statute; and

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(5)any claim which, as a matter of law or public policy, cannot be waived, released or forfeited.

(m)This Agreement constitutes, among other things, a full and complete release of any and all Claims released by Executive, and it is the intention of the Parties that this Agreement shall provide the Released Parties a complete and absolute defense to anything released hereunder, except as modified above. Executive expressly and knowingly waives his rights to assert any Claims against the Released Parties, which Claims are released hereunder. Executive further represents and warrants that no charges, claims or suits of any kind have been filed by Executive against the Released Parties as of the date of this Agreement.

(n)Executive understands and agrees that he would not receive the Severance Benefits unless he executes this Agreement and fulfills the promises contained herein.

4.Non-Disparagement and Inquiries.

(o)Executive shall not (and shall not cause or encourage any other person to) make, publish, or communicate any written or oral statement to any person that defames, disparages, ridicules or criticizes the Executive, any of the Released Parties or the Released Parties’ business, products, services, or policies (“Disparaging Statements”). The Company agrees to instruct the individual members of the Board and executive level employees of the Company -- the President and Chief Executive Officer, General Counsel/Corporate Secretary, Vice President/Strategy/Investor Relations, President of Southwest Gas Corporation, Chief Human Resources Officer, Chief Financial Officer, Treasurer, and Vice President Operations -- who served during Executive’s employment (the “Board”) to refrain from making Disparaging Statements; provided, however, Executive understands and agrees that the Company’s obligations under this Section 4(a) extend only to the Company’s duty to instruct the Board and the above executive level employees of the Company and, for the avoidance of doubt, that the Company is not responsible for Disparaging Statements that are made by executive level employees of the Company or members of the Board after they leave the Company or the Board. This restriction includes, without limitation, Disparaging Statements made, whether directly or indirectly, to or on social media, podcasts, internet websites, as well as statements to the media, including writers, researchers, reporters, magazines, newspapers, book publishers, television stations, radio stations, the motion picture industry, public interest groups, and the publishing industry generally. The Company and Executive also mutually represent and warrant that neither Party

6

has made or published any Disparaging Statements about the other or the Released Parties as of the date the Parties sign this Agreement. The Parties agree that this Section 4 supersedes any prior agreements or understandings between the Parties regarding its subject matter, including the non-disparagement clause included in Section 7 of the CIC Agreement.

(p)Executive shall refer all inquiries, if any, made by prospective employers concerning Executive’s employment with the Company, to the Company’s Chief Human Resources Officer and the Company will respond to such inquiries from prospective employers by confirming that Executive is no longer employed by the Company and, if requested, will confirm title and dates of employment.

(q)Notwithstanding the foregoing, nothing in this Section 4 shall prevent (and none of the following shall be deemed a breach of this section) any person from testifying truthfully to the extent (i) necessary with respect to any litigation, arbitration or mediation including, but not limited to, the enforcement of this Agreement, or (ii) required by law or by any court, arbitrator, mediator or administrative or legislative body (including any committee thereof) with jurisdiction over such person. Further, nothing in this Agreement shall infringe upon Executive’s Section 7 rights under the National Labor Relations Act of 1935; nor shall this provision limit or effect in any way Executive’s ability to communicate with and participate in any federal, state or local government agency action.

5.Litigation Cooperation. Executive agrees to cooperate, as reasonably requested, with the Company or its affiliates and subsidiaries in the defense of any action brought by any third party against the Company or any of its affiliates or subsidiaries that relates to Executive’s service to any such entity for up to fifty (50) hours per year in each of the three (3) years after the Separation Date (“Litigation Cooperation”). The Company shall compensate Executive for Litigation Cooperation—except for sworn testimony in deposition or other proceedings —at an hourly rate of $525.00, except that the Company shall not compensate Executive for time spent testifying in court or in an arbitration hearing. Notwithstanding the preceding sentence, it is understood that time Executive spends providing sworn testimony in deposition or other proceedings will count against the up to fifty (50) hour yearly cap Executive is required to engage in Litigation Cooperation pursuant to this Section 5. The Company shall also reimburse Executive’s reasonable out of pocket expenses incurred in connection with Litigation Cooperation upon submission to the Company of appropriate documentation as prescribed by the

7

Company. Further, to the full extent permitted by law, Executive agrees that he shall not act as a consultant to or provide any information to any third party or otherwise assist any third party either directly or indirectly, including taking any action or pursuing any claim, or cause of action of any kind or nature against the Company, SWX, or their affiliates relating to any of the matters in which Executive had been working on either directly or indirectly prior to the Separation Date, whether pursued through court, arbitration, administrative, investigatory, shareholder vote, or other procedures.

6.Affirmations. Aside from the payments owed pursuant to this Agreement as discussed herein, Executive affirms that he has been paid and/or has received all compensation, wages, bonuses, commissions, and/or benefits which are due and payable as of the date Executive signs this agreement. Executive further affirms that he has no known workplace injuries or occupational diseases that have not already been reported to the Company or adjudicated. Executive further affirms that he has not been retaliated against for reporting any allegations of wrongdoing by the Company or their respective officers, including any allegations of corporate fraud. Executive affirms that all of the Company’s decisions regarding Executive’s pay and benefits through the date of Executive’s execution of this Agreement were not discriminatory based on age, disability, race, color, sex, religion, national origin or any other classification protected by law. Executive also affirms that he has not divulged any proprietary or confidential information of the Company and will continue to maintain the confidentiality of such information consistent with this Agreement.

7.Successors and Assigns. This agreement shall be binding upon each of the Parties and each of their respective successors and permitted assigns.

8.Effect of Agreement. Executive acknowledges and agrees that this agreement and the payments and covenants hereunder shall not be construed as an admission or acknowledgement by either party of (a) any liability whatsoever to the other party or any other person, (b) any violation of any federal, state or local statute, ordinance or regulation, or (c) any violation of a duty or obligation the Company owes or owed to Executive. Executive acknowledges and agrees that his execution of this Agreement is a voluntary act to bring an amicable conclusion to Executive’s employment relationship with the Company.

9.Confidentiality of Agreement. Executive expressly agrees that he shall not disclose the terms and conditions of this Agreement without prior written consent from the Company (by and

8

through either its General Counsel or Chief Executive Officer) to any individual, entity or organization not a party to this Agreement, other than Executive’s immediate family, legal counsel or tax advisors, and/or to any federal, state, or local government agency, unless such disclosure shall be required by law. In the event disclosure is required by law, Executive shall – to the extent possible -- provide the Company with five (5) days’ notice prior to disclosure so that the Company may, if it chooses, seek to prevent disclosure through available legal processes. Notwithstanding the foregoing, Executive may explain such non-disclosure by referring to this confidentiality obligation.

10.Confidentiality of Proprietary Information. Executive acknowledges and agrees that in the course of his employment with the Company, and particularly in his most recent position, Executive has acquired and/or had access to highly confidential or proprietary information, including trade secrets, relating to the business of the Company. Executive agrees that all such data and information is and shall remain the sole and exclusive property of the Company, and shall be returned to the Company, as applicable, in a complete and unaltered form, on or before May 31, 2022. Executive agrees that no part or portion of any such information or data shall be used, reproduced, published or disseminated in any manner whatsoever. Executive expressly agrees that he will keep secret and safeguard all such information, and will not, at any time, in any form or manner, directly or indirectly, divulge, disclose or communicate to any person, firm, corporation or other entity any such information without the written authority of the Company by and through either its General Counsel or Chief Executive Officer. If it deems necessary, the Company shall be entitled to enforce such agreement by seeking and obtaining an injunction by any competent court to enjoin and restrain the unauthorized disclosure of such information.

11.Return of Company Property.

(r)On or before May 31, 2022, Executive shall return to the Company any and all property of the Released Parties, including, but not limited to, office, desk and file cabinet keys, Company identification/pass cards, passwords and account information for any Company systems, credit cards issued to Executive by the Company, equipment owned by the Company (including computers and printers), and any other property of the Company in the possession, custody or control of Executive or Executive’s agents. Executive shall also surrender and deliver to the Company all files, papers, data, documents, lists, charts, photographs, computer records, equipment, discs or any other records (in electronic or any other format), relating in any manner

9

to the business activities of the Company, which were created, produced, reproduced or utilized by the Company, or any of the Released Parties, or by Executive during the term of Executive’s employment relationship with the Company, if any.

(s)Executive also agrees to repay any monies owed to the Company or the Released Parties, if any, including loans, advances, charges or debts incurred by Executive, or any other amounts owed to the Released Parties, on or before 5:00 p.m. PST on May 31, 2022.

(t)The Company’s obligation to make the payments required by Section 2 shall terminate if Executive fails to either return the Released Parties’ property, if any, or repay all sums owed the Released Parties as required in subsections (a) and (b) of this Section 12.

12.Knowing and Voluntary Agreement. Executive acknowledges, warrants, represents and agrees that, in executing and delivering this Agreement, Executive does so freely, knowingly and voluntarily and that he is fully aware of the contents and effect thereof and that such execution and delivery is not the result of any fraud, duress, mistake or undue influence whatsoever.

13.Unknown or Mistake in Facts. Executive and the Company for his or itself, understands and represents that they have entered into this Agreement solely on the basis of facts as they understand them, and not any facts, understandings or representations other than expressly stated in this Agreement. To the extent Executive or the Company did not do so, he or it, as the case may be, expressly assumes the risk of such facts, understandings or representations being different and agree that this Agreement shall be in all respects effective and not subject to termination or rescission by any such difference in facts, understandings or representations.

14.Savings Clause. It is acknowledged and agreed by Executive and the Company that should any provision of this Agreement be declared or determined to be illegal or invalid by final determination of any court of competent jurisdiction, the validity of the remaining parts, terms or provisions of this Agreement shall not be affected thereby, and the illegal or invalid part, term or provision shall be deemed not to be a part of this Agreement.

15.Enforcement. Executive and the Company expressly agree that this Agreement constitutes a binding contract. If Executive breaches any term of this Agreement, or violates any of Executive’s obligations under this Agreement, the Company may, at its option, terminate or suspend all payments and benefits remaining to be paid by the Company under this Agreement. In addition, the Company may seek all other remedies and relief allowed by law. The Parties

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agree that any disputes regarding the compliance with or enforcement of this Agreement will be resolved in accordance with the Arbitration and Litigation procedures described in Section 5 of the CIC Agreement.

16.Entirety of Agreement: Modifications. Executive acknowledges and agrees that this Agreement, and any attachments hereto, contains the entire agreement and understanding concerning the subject matter between Executive and the Company, and that it supersedes and replaces all prior agreements, whether written or oral, as to the subject matters addressed herein. Executive also represents that he has not executed this instrument in reliance on any promise, representation or statement not contained herein. This Agreement may not be modified except by a writing signed by both Executive and the Company, or their duly authorized representatives.

17.Applicable Laws. This Agreement shall be interpreted, enforced and governed under the laws of the state of Nevada, without regard to Nevada’s conflicts of law provisions. The parties further understand and agree that, with respect to provisional relief as described in Section 5 of CIC Agreement, venue shall be in either the United States District Court for the Southern District of Nevada or the State of Nevada, Eighth Judicial District Court in and for Clark County.

18.Effective Date.

(u)It is acknowledged and agreed that Executive has 21 days from receipt of this Agreement to consider the terms and conditions before signing it. Further, Executive has the right to revoke this Agreement at any time during the seven day period following the date that Executive executes this Agreement (“Revocation Period”). This Agreement shall be effective and enforceable on the day following the expiration of the Revocation Period, provided Executive has not revoked this Agreement during the Revocation Period (“Effective Date”).

(v)To revoke this Agreement, Executive must submit written notice of revocation within seven days of Executive signing this Agreement. The notice of revocation must be received by Sharon Braddy-McKoy at Sharon.braddymckoy@swgas.com within the Revocation Period. If Executive revokes this Agreement on a timely basis, all obligations of the Parties under this Agreement shall immediately cease, including with respect to the Company, the payment of the Severance Benefits.

19.Executive Rights. Executive acknowledges, represents and agrees to the following:

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(w)EXECUTIVE HAS BEEN ADVISED TO READ THIS ENTIRE AGREEMENT CAREFULLY AND TO CONSULT WITH AN ATTORNEY OF EXECUTIVE’S CHOICE PRIOR TO SIGNING THIS AGREEMENT.

(x)Executive received a copy of this Agreement on May 17, 2022.

(y)Executive was given at least 21 days to consider the terms and conditions of this Agreement and the Affirmation before signing. The Parties hereby agree that any modifications to the Agreement or Affirmation that were originally provided to Executive, whether considered or deemed to be material or nonmaterial, shall not restart the 21 day consideration period.

(z)If Executive fails to sign the Agreement on or before the Deadline (June 7, 2022, at 5:00 p.m. PST), it shall not become effective or enforceable, and Executive will not receive the Severance Benefits.

(aa)Executive is advised, in writing, that he has a full seven days after he signs this Agreement to revoke it, and that this Agreement will not become effective until that seven day Revocation Period has expired. If Executive notifies the Company, in writing, of his election to revoke this Agreement within the seven day Revocation Period, all obligations of the Parties under this Agreement shall immediately cease.

(ab)Executive carefully read the Agreement prior to signing it, fully understands its terms, and signed it voluntarily.

(ac)This Agreement does not prevent Executive from later challenging the validity of the Agreement, filing a claim to enforce Executive’s rights or the Company’s obligations under this Agreement, or from filing a charge with any government agency.

(ad)Executive understands and agrees that Executive will not receive the Severance Benefits if he fails or refuses to sign this Agreement or the Affirmation or if he provides the Company with timely written notice of his election to revoke either.

EXECUTIVE FREELY AND KNOWINGLY, AND AFTER DUE CONSIDERATION, ENTERS INTO THIS AGREEMENT INTENDING TO WAIVE, SETTLE AND RELEASE ALL CLAIMS IDENTIFIED IN SECTION 3 OF THIS AGREEMENT, INCLUDING BUT NOT LIMITED TO AGE DISCRIMINATION CLAIMS, EXECUTIVE HAS OR MIGHT HAVE AGAINST THE RELEASED PARTIES.

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EXECUTIVE	SOUTHWEST GAS CORPORATION
/s/ John Hester____________	By:_/s/ Sharon Braddy-McKoy______
John Hester	Sharon Braddy-McKoy
	Chief Human Resources Officer
June 3, 2022	June 6, 2022______________________
Date	Date
SOUTHWEST GAS HOLDINGS, INC.
By:_/s/ Karen S. Haller__________
Karen S. Haller
President/Chief Executive Officer
June 6, 2022___________________
Date

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EXHIBIT A

CERTIFICATE OF REAFFIRMATION
OF SEVERANCE AGREEMENT AND GENERAL RELEASE

TO BE SIGNED ON OR AFTER THE SEPARATION DATE. NOT VALID IF SIGNED EARLIER

As required by and as material consideration for the Severance Agreement and General Release (“Agreement”), entered into by and between John P. Hester (“Executive”) and Southwest Gas Corporation (the “Company”), Executive freely and voluntarily agrees to enter into and be bound by this Affirmation of the Severance Agreement and General Release (the “Affirmation”). This Affirmation shall be effective on the 8th day after it is signed, provided it is not revoked as provided below (the “Affirmation Effective Date”).

Executive hereby reaffirms all of Executive’s obligations and representations in the Agreement, including but not limited to Executive’s release of claims in Section 3 of the Agreement up through the date Executive signs this Affirmation below.

Aside from the payments owed by the Company to Executive pursuant to the Agreement, Executive affirms that he has been paid and/or has received all compensation, wages, bonuses, commissions, and/or benefits which are due and payable as of the date employee signs this agreement. Executive further affirms that he has no known workplace injuries or occupational diseases that have not already been reported to the Company or adjudicated. Executive further affirms that he has not been retaliated against for reporting any allegations of wrongdoing by the Company and its affiliates or their respective officers, including any allegations of corporate fraud. Executive affirms that all of the Company’s decisions regarding Executive’s pay and benefits through the date of Executive’s execution of this Affirmation were not discriminatory based on age, disability, race, color, sex, religion, national origin or any other classification protected by law. Executive also affirms that he has not divulged any proprietary or confidential information of the Company and will continue to maintain the confidentiality of such information consistent with the Agreement.

Executive acknowledges that Executive had twenty-one (21) days to consider this Affirmation and has seven (7) days following Executive’s execution of the Affirmation to revoke the Affirmation; and that this Affirmation shall not be effective until the Revocation Period (as defined in the Agreement) has expired.

Executive understands that Executive will not be eligible for the Severance Benefits under the Agreement unless Executive signs and does not revoke this Affirmation.

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Executive understands that the Company, in providing Executive with Severance Benefits under the Agreement, is relying on this Affirmation, and that Executive’s eligibility and receipt of any benefits under the Agreement are conditioned on Executive’s continued compliance with the Agreement.

Executive acknowledges, warrants, represents and agrees that, in executing and delivering this Agreement, Executive does so freely, knowingly and voluntarily and that he is fully aware of the contents and effect thereof and that such execution and delivery is not the result of any fraud, duress, mistake or undue influence whatsoever.

____________________________________    __________________________, 2022
John P. Hester                    Date of Execution

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EX-10.03

Executive LTIP Award Ag

AMENDED AND RESTATED CENTURI GROUP AWARD AGREEMENT

UNDER THE SOUTHWEST GAS HOLDINGS, INC. OMNIBUS INCENTIVE PLAN, THE CENTURI GROUP, INC. EXECUTIVE DEFERRED COMPENSATION PLAN AND THE CENTURI GROUP, INC. LONG-TERM INCENTIVE PLAN

This Amended and Restated Award Agreement (“Award Agreement”) is dated as of __________, 2022, by and between Centuri Group, Inc., (the "Company" or “Centuri”), Southwest Gas Holdings, Inc., and _______________ ("Grantee"), pursuant to the Company's Executive Deferred Compensation Plan (“EDCP”), Centuri Long-Term Incentive Plan, (“LTIP”) and the Southwest Gas Holdings, Inc. Omnibus Incentive Plan (collectively, the "Plans" and individually a “Plan”). Capitalized terms that are used, but not defined, in this Award Agreement shall have the meaning set forth in the Plans, and the Plans are incorporated by reference into this Award Agreement.

Overview of Your Long-Term Incentive Award Opportunity

[determined by award opportunity and Beginning Stock Price]

Total Long-Term Incentive Amount:         $[______]

SWX Stock Price at Award:            $[______]

Aggregate Time Based Shares: [______] Shares

Performance Period: January 1, 2022 to December 31, 2024

1. Target Long-Term Incentive Award Opportunity. Grantee’s target long-term incentive amount is [__]% of base salary. An amount equal to [__]% of base salary is the award opportunity payable in the form of Southwest Gas Holdings Inc. stock and will vest pursuant to the terms of this Award Agreement and the LTIP.

2. Grant of Southwest Gas Holdings Shares. The Company and Southwest Gas Holdings, Inc. ("SWX") hereby grant to the Grantee Time-Based Shares of SWX common stock (“Share”), subject to the terms and conditions of this Award Agreement and the applicable terms of the Plans. Each Share represents a share of SWX Common Stock. Until the Shares have vested, the Grantee shall not have any of the rights of a shareholder of SWX with respect to the Shares, except for the crediting of dividend equivalents as provided for in Section 8 below. Share Price for the award is determined by the closing price on the applicable stock exchange of one share of SWX Common Stock on the last trading day immediately prior to the first day of the Performance Period.

The Company and SWX currently anticipate a spin-off, sale or other transaction to occur during the Performance Period whereby Centuri would no longer be a subsidiary of SWX. Such anticipated transaction could result in the Shares being converted into Centuri stock, but the dollar value of the award would remain consistent. In the event the anticipated transaction is a public spin-off, it shall not be considered a “Change in Control” as that term is defined in the LTIP.

3. Restrictions on Alienation. Shares subject to this Agreement may not be sold, transferred, pledged, assigned, or otherwise alienated in any manner, whether voluntarily, by operation of law, or otherwise,

1

Executive LTIP Award Ag

until the restrictions on the Shares are removed and the Shares are delivered to the Grantee in the form of shares of Common Stock.

4. Time-Based Shares. Vesting of Time-based Shares takes place on the SWX Board approved, LTIP specified, Share delivery date following the end of the Performance Period.

5. Holding Requirements. Grantee shall accumulate Southwest Gas Holdings, Inc. stock with a target value of a multiple of [______] times base salary. Until Grantee reaches the target ownership requirement, Grantee must retain [______]% of the net after-tax Shares granted under this Award Agreement. Grantee shall also defer a target value of [______] times base salary in the Long-Term Capital Investment Fund pursuant to a timely deferral election in the EDCP and such election shall be made and administered to the maximum extent possible to comply with Section 409A of the Internal Revenue Code of 1986 as amended (“Code”).

6. Forfeiture of Shares.

As provided in the LTIP, stock awards shall be forfeited if, prior to the removal of restrictions on the stock awards, the Grantee has experienced a Termination for any reason other than as described below in Section 7. The Grantee shall execute any documents reasonably requested by the Company in connection with such forfeiture. Upon any forfeiture, all rights of the Grantee with respect to the forfeited stock awards shall cease and terminate, without any further obligation on the part of the Company or SWX.

7. Removal of Restrictions.

In the event of Grantee's death or Termination due to Disability or Retirement, accelerated vesting and proration of the LTIP stock awards shall be as described in the LTIP. Notwithstanding LTIP provisions to the contrary, in the event of an employer-initiated involuntary Separation from Service following a Change in Control, the LTIP stock awards shall be subject to accelerated vesting and shall not be subject to proration based on actual months of service; provided that the Change in Control benefit provided under this Award Agreement will be in effect for the longer of six months following a Change in Control or the period of time Change in Control Benefits are provided in the Participant’s Employment Agreement, if any. In the event of an employer-initiated involuntary Separation from Service Without Cause occurring after the end of the Change in Control benefit provided in this Award Agreement or the Participant’s Employment Agreement, and before the end of the Performance Period, the LTIP stock awards shall be subject to accelerated pro-rata vesting based on actual full months of service.

For purposes of this Agreement and except for a public spin-off transaction not being a Change in Control, the term “Termination” shall have the same meaning as the term “Separation From Service” in the LTIP and the terms “Disability,” “Retirement” and “Change in Control” shall have the meaning given to such terms in the LTIP. “Separation from Service Without Cause” shall mean termination of employment for any reason other than death, disability, retirement or for “Cause”, as defined in the Participant’s Employment Agreement, if any. If the Participant does not have an employment agreement, “Cause” means any one or more of the following: (a) the Participant’s negligence in the performance of, intentional nonperformance of, or inattention to the Participant’s material duties and responsibilities, any of which continue for five (5) business days after receipt of written notice of need to cure the same; (b) the Participant’s willful dishonesty, fraud or material misconduct with respect to the business or affairs of the Company; (c) the violation by the Participant of any of the Company policies or procedures, which violation is not cured by the Participant within five (5) business days after the Participant has been given written notice thereof; (d) a conviction of, a plea of nolo contendere, a guilty plea, or confession by the

2

Executive LTIP Award Ag

Participant to, an act of fraud, misappropriation or embezzlement or any crime punishable as a felony or any other crime that involves moral turpitude; (e) the Participant’s use of illegal substances or habitual drunkenness; (f) the breach by the Participant of the Participant’s employment or other service agreement if the Participant does not cure such breach within five (5) business days after the Participant has been given written notice thereof; or (g) a breach by the Participant of the non-solicitation, non-compete, and confidentiality requirements set forth in Section 3.12 of the LTIP.

8. Credit of Dividend Equivalents.

The Grantee’s account shall be credited with a number of Shares based on the amount of dividends that were declared and paid on shares of Common Stock during each fiscal quarter of the Performance Period. The number of Shares upon which dividend equivalents shall be credited for the benefit of the Grantee is the total number of Shares finally determined to have been earned by the Grantee at the end of the Performance Period in accordance with Sections 4 and/or 7, as appropriate. The total amount of each quarterly dividend equivalent shall be converted to the number of Shares attributable to that quarterly dividend equivalent, by dividing such dividend equivalent amount by the average of the closing price of the Common Stock on the dividend payment date during the appropriate Performance Period. Incremental Shares credited for dividends may also earn dividend equivalents. Company or SWX shall maintain a bookkeeping account for Grantee that shall be credited with Shares as described in this Section 8. The Grantee’s account shall be debited by the number of Shares that Grantee forfeits or is paid according to Sections 6 and 9 of this Agreement.

9. Distribution of Common Stock.

The Grantee shall receive a distribution of whole shares of Common Stock equal to the number of vested Shares plus dividend equivalents, as applicable, provided the Grantee has remained in continuous service with the Company during the entire term of the Performance Period (except in the event of death, Termination due to Disability, or Retirement, or certain Change in Control events, which is governed by the LTIP, as modified by this Award Agreement). Distribution of shares of Common Stock shall occur as soon as administratively possible following the SWX Board approved LTIP specified Share delivery date that follows the end of the Performance Period (the “Distribution Date”), but in no event later than 180 days following the last trading day of the Performance Period. Notwithstanding the immediately preceding sentence, in the case of a distribution of vested shares of Common Stock (on account of any Termination pursuant to Section 7, other than death), plus any Shares attributable to dividends payable with respect to such number of Shares, on behalf of the Grantee (if the Grantee is a "specified employee," as defined in §1.409A-1(i) of the Final Regulations for Code Section 409A) shall, to the extent required by Code Section 409A, not occur until the date which is six (6) months following the date of the Grantee’s Termination (or, if earlier, upon the death of the Grantee). Upon a distribution of shares of Common Stock as provided herein, the Company and Southwest Gas Holdings, Inc. shall cause the Common Stock then being distributed to be registered in the Grantee’s name, but shall not issue certificates for the Common Stock unless the Grantee requests delivery of the certificates for the Common Stock, in writing in accordance with the procedures established by the Company and Southwest Gas Holdings, Inc. The Company and Southwest Gas Holdings, Inc. shall deliver certificates to the Grantee as soon as administratively practicable following the Company’s receipt of a written request from the Grantee for delivery of the certificates. From and after the date of receipt of such distribution, the Grantee or the Grantee's legal representatives, beneficiaries or heirs, as the case may be, shall have full rights of transfer or resale with respect to such shares subject to applicable state and federal regulations.

3

Executive LTIP Award Ag

10. Administration.

This Award Agreement and the rights of the Grantee hereunder are subject to all the terms and conditions of the Plans. Any inconsistency between this Award Agreement and the Plans shall be resolved in favor of the Plans, except with regard to the Change in Control provisions that have been modified by this Award Agreement and therefore are controlled by this Award Agreement.

12. Miscellaneous.

(a)Nothing in this Award Agreement or the Plans shall interfere with or limit in any way the right of the Company to terminate the Grantee’s employment, nor confer upon the Grantee any right to continued employment with the Company.

(b)Subject to applicable law, each of the Plans may be terminated, amended, or modified as prescribed in such Plan; provided, however, that no such termination, amendment, or modification of the Plans may in any way adversely affect the Grantee’s rights under this Award Agreement without the Grantee’s written consent. The terms of this Agreement shall be administered and interpreted by the Company’s Compensation Committee (“Committee”) pursuant to the administrative powers given to it by the LTIP; accordingly, the Committee may interpret, administer, reconcile any inconsistency in, correct any defect in and/or supply any omission in this Agreement.

(c)The Grantee shall not have voting rights with respect to the Shares until the Shares are settled, vested, and have been distributed as shares of Common Stock.

(d)This Award Agreement shall be subject to all applicable laws, rules, and regulations, and to such approvals by any governmental agencies or national securities exchanges as may be required.

(e)This Award Agreement shall be governed by the corporate laws of the State of Nevada, without giving effect to any choice of law provisions that might otherwise refer construction or interpretation of the Award Agreement or the Plans to the substantive law of another jurisdiction.

Grantee acknowledges that this Award Agreement and the Plans set forth the entire understanding between Grantee and the Company regarding the acquisition of the Shares granted pursuant to this Award Agreement. Grantee has reviewed and fully understands all provisions of this Award Agreement and the Plans in their entirety. Grantee acknowledges that Shares awarded hereunder may not be sold, transferred, pledged, assigned, or otherwise alienated until the Shares are vested and delivered to the Grantee in the form of shares of Common Stock.

SOUTHWEST GAS HOLDINGS, INC.

By:_________________________________

     Karen S. Haller, President and Chief Executive Officer    

CENTURI GROUP, INC.

By: _________________________________

     Paul M. Daily, President and Chief Executive Officer    

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Executive LTIP Award Ag

GRANTEE

By: _______________________

[______________________]

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EX-31.01

Exhibit 31.01

Certification of Southwest Gas Holdings, Inc.

I, Karen S. Haller, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Southwest Gas Holdings, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated: August 9, 2022

/s/ KAREN S. HALLER

Karen S. Haller

President and Chief Executive Officer

Southwest Gas Holdings, Inc.

Certification of Southwest Gas Holdings, Inc.

I, Gregory J. Peterson, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Southwest Gas Holdings, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated: August 9, 2022

/s/ GREGORY J. PETERSON

Gregory J. Peterson

Senior Vice President/Chief Financial Officer

Southwest Gas Holdings, Inc.

EX-31.02

Exhibit 31.02

Certification of Southwest Gas Corporation

I, Karen S. Haller, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Southwest Gas Corporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated: August 9, 2022

/s/ KAREN S. HALLER

Karen S. Haller

Chief Executive Officer

Southwest Gas Corporation

Certification of Southwest Gas Corporation

I, Gregory J. Peterson, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Southwest Gas Corporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated: August 9, 2022

/s/ GREGORY J. PETERSON

Gregory J. Peterson

Senior Vice President/Chief Financial Officer

Southwest Gas Corporation

EX-32.01

Exhibit 32.01

SOUTHWEST GAS HOLDINGS, INC.

CERTIFICATION

In connection with the periodic report of Southwest Gas Holdings, Inc. (the “Company”) on Form 10-Q for the period ended June 30, 2022 as filed with the Securities and Exchange Commission (the “Report”), I, Karen S. Haller, the President and Chief Executive Officer of the Company, hereby certify as of the date hereof, solely for purposes of Title 18, Chapter 63, Section 1350 of the United States Code, that to the best of my knowledge:

(1)the Report fully complies with the requirements of section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company at the dates and for the periods indicated.

This Certification has not been, and shall not be deemed, “filed” with the Securities and Exchange Commission.

Dated: August 9, 2022

/s/ Karen S. Haller

Karen S. Haller
President and Chief Executive Officer

SOUTHWEST GAS HOLDINGS, INC.

CERTIFICATION

In connection with the periodic report of Southwest Gas Holdings, Inc. (the “Company”) on Form 10-Q for the period ended June 30, 2022 as filed with the Securities and Exchange Commission (the “Report”), I, Gregory J. Peterson, Senior Vice President/Chief Financial Officer of the Company, hereby certify as of the date hereof, solely for purposes of Title 18, Chapter 63, Section 1350 of the United States Code, that to the best of my knowledge:

(1)the Report fully complies with the requirements of section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company at the dates and for the periods indicated.

This Certification has not been, and shall not be deemed, “filed” with the Securities and Exchange Commission.

Dated: August 9, 2022

/s/ Gregory J. Peterson

Gregory J. Peterson
Senior Vice President/Chief Financial Officer

EX-32.02

Exhibit 32.02

SOUTHWEST GAS CORPORATION

CERTIFICATION

In connection with the periodic report of Southwest Gas Corporation on Form 10-Q for the period ended June 30, 2022 as filed with the Securities and Exchange Commission (the “Report”), I, Karen S. Haller, the Chief Executive Officer of Southwest Gas Corporation, hereby certify as of the date hereof, solely for purposes of Title 18, Chapter 63, Section 1350 of the United States Code, that to the best of my knowledge:

(1)the Report fully complies with the requirements of section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Southwest Gas Corporation at the dates and for the periods indicated.

This Certification has not been, and shall not be deemed, “filed” with the Securities and Exchange Commission.

Dated: August 9, 2022

/s/ Karen S. Haller

Karen S. Haller
Chief Executive Officer

SOUTHWEST GAS CORPORATION

CERTIFICATION

In connection with the periodic report of Southwest Gas Corporation on Form 10-Q for the period ended June 30, 2022 as filed with the Securities and Exchange Commission (the “Report”), I, Gregory J. Peterson, Senior Vice President/Chief Financial Officer of Southwest Gas Corporation, hereby certify as of the date hereof, solely for purposes of Title 18, Chapter 63, Section 1350 of the United States Code, that to the best of my knowledge:

(1)the Report fully complies with the requirements of section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Southwest Gas Corporation at the dates and for the periods indicated.

This Certification has not been, and shall not be deemed, “filed” with the Securities and Exchange Commission.

Dated: August 9, 2022

/s/ Gregory J. Peterson

Gregory J. Peterson
Senior Vice President/Chief Financial Officer

XML

Cover - shares	6 Months Ended
	Jun. 30, 2022	Jul. 29, 2022
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2022
Document Transition Report	false
Entity File Number	001-37976
Entity Registrant Name	Southwest Gas Holdings, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	81-3881866
Entity Address, Address Line One	8360 S. Durango Drive
Entity Address, Address Line Two	Post Office Box 98510
Entity Address, City or Town	Las Vegas,
Entity Address, State or Province	NV
Entity Address, Postal Zip Code	89193-8510
City Area Code	(702)
Local Phone Number	876-7237
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		67,007,222
Entity Central Index Key	0001692115
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Southwest Gas Holdings, Inc. Common Stock, $1 Par Value
Entity Information [Line Items]
Title of 12(b) Security	Southwest Gas Holdings, Inc. Common Stock, $1 Par Value
Trading Symbol	SWX
Security Exchange Name	NYSE
Preferred Stock Purchase Rights
Entity Information [Line Items]
Title of 12(b) Security	Preferred Stock Purchase Rights
Security Exchange Name	NYSE
No Trading Symbol Flag	true
Southwest Gas Corporation
Entity Information [Line Items]
Document Type	10-Q
Entity File Number	1-7850
Entity Registrant Name	Southwest Gas Corporation
Entity Incorporation, State or Country Code	CA
Entity Tax Identification Number	88-0085720
Entity Address, Address Line One	8360 S. Durango Drive
Entity Address, Address Line Two	Post Office Box 98510
Entity Address, City or Town	Las Vegas,
Entity Address, State or Province	NV
Entity Address, Postal Zip Code	89193-8510
City Area Code	(702)
Local Phone Number	876-7237
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Central Index Key	0000092416
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Amendment Flag	false
Current Fiscal Year End Date	--12-31

XML

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Regulated operations plant:
Gas plant	$ 11,049,050	$ 10,789,690
Less: accumulated depreciation	(3,496,191)	(3,397,736)
Construction work in progress	218,638	202,068
Net regulated operations plant	7,771,497	7,594,022
Other property and investments, net	1,312,701	1,316,479
Current assets:
Cash and cash equivalents	215,963	222,697
Accounts receivable, net of allowance	750,794	707,127
Accrued utility revenue	40,000	84,900
Income taxes receivable, net	19,147	16,816
Deferred purchased gas costs	354,571	291,145
Prepaid and other current assets	263,363	292,082
Total current assets	1,643,838	1,614,767
Noncurrent assets:
Goodwill	1,750,472	1,781,332
Deferred income taxes	168	121
Deferred charges and other assets	444,332	458,536
Total noncurrent assets	2,194,972	2,239,989
Total assets	12,923,008	12,765,257
Capitalization:
Common stock, $1 par (authorized - 120,000,000 shares; issued and outstanding - 67,003,792 and 60,422,081 shares)	68,634	62,052
Additional paid-in capital	2,279,493	1,824,216
Accumulated other comprehensive loss, net	(45,528)	(46,761)
Retained earnings	1,156,253	1,114,313
Total equity	3,458,852	2,953,820
Redeemable noncontrolling interests	122,656	196,717
Long-term debt, less current maturities	4,588,454	4,115,684
Total capitalization	8,169,962	7,266,221
Current liabilities:
Current maturities of long-term debt	41,276	297,324
Short-term debt	1,462,747	1,909,000
Accounts payable	306,753	353,365
Customer deposits	53,991	59,327
Income taxes payable, net	1,725	6,734
Accrued general taxes	55,883	53,473
Accrued interest	35,697	30,964
Deferred purchased gas costs	4,986	5,736
Other current liabilities	387,359	396,126
Total current liabilities	2,350,417	3,112,049
Deferred income taxes and other credits:
Deferred income taxes and investment tax credits, net	785,258	768,868
Accumulated removal costs	494,554	480,583
Other deferred credits and other long-term liabilities	1,122,817	1,137,536
Total deferred income taxes and other credits	2,402,629	2,386,987
Total capitalization and liabilities	$ 12,923,008	$ 12,765,257

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jun. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Common stock, par (in USD per share)	$ 1	$ 1
Common stock, authorized (in shares)	120,000,000	120,000,000
Common stock, issued (in shares)	67,003,792	60,422,081
Common stock, outstanding (in shares)	67,003,792	60,422,081

XML

CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating revenues:
Regulated operations revenues	$ 440,030	$ 292,796	$ 1,183,562	$ 814,728	$ 1,890,624	$ 1,400,052
Utility infrastructure services revenues	706,090	528,625	1,229,967	892,600	2,496,028	2,012,582
Total operating revenues	1,146,120	821,421	2,413,529	1,707,328	4,386,652	3,412,634
Operating expenses:
Net cost of gas sold	147,860	76,496	446,778	232,517	645,168	347,060
Operations and maintenance	175,791	104,833	325,094	211,523	586,717	416,439
Depreciation and amortization	108,010	82,848	230,656	176,290	425,407	343,447
Taxes other than income taxes	22,606	19,338	47,422	40,025	87,740	71,765
Utility infrastructure services expenses	646,193	478,640	1,149,425	814,254	2,290,638	1,794,145
Total operating expenses	1,100,460	762,155	2,199,375	1,474,609	4,035,670	2,972,856
Operating income	45,660	59,266	214,154	232,719	350,982	439,778
Other income and (expenses):
Net interest deductions	(53,206)	(25,939)	(101,569)	(49,903)	(170,864)	(106,550)
Other income (deductions)	(2,835)	(1,311)	(1,591)	(863)	(4,227)	5,193
Total other income and (expenses)	(56,041)	(27,250)	(103,160)	(50,766)	(175,091)	(101,357)
Income (loss) before income taxes	(10,381)	32,016	110,994	181,953	175,891	338,421
Income tax expense (benefit)	(4,300)	5,542	19,825	36,634	22,839	67,003
Net income (loss)	(6,081)	26,474	91,169	145,319	153,052	271,418
Net income attributable to noncontrolling interests	494	1,355	1,566	2,907	5,082	7,189
Net income (loss) attributable to Southwest Gas Holdings, Inc.	$ (6,575)	$ 25,119	$ 89,603	$ 142,412	$ 147,970	$ 264,229
Earnings (loss) per share:
Basic (in USD per share)	$ (0.10)	$ 0.43	$ 1.40	$ 2.45	$ 2.39	$ 4.61
Diluted (in USD per share)	$ (0.10)	$ 0.43	$ 1.40	$ 2.45	$ 2.38	$ 4.60
Weighted average shares:
Basic (in shares)	67,045	58,607	63,909	58,106	62,022	57,348
Diluted (in shares)	67,190	58,710	64,041	58,197	62,157	57,440

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (6,081)	$ 26,474	$ 91,169	$ 145,319	$ 153,052	$ 271,418
Defined benefit pension plans:
Net actuarial gain (loss)	0	0	0	0	44,974	(43,730)
Amortization of prior service cost	33	182	66	364	431	802
Amortization of net actuarial loss	6,615	8,472	13,231	16,946	30,179	31,322
Regulatory adjustment	(5,524)	(7,277)	(11,047)	(14,554)	(63,520)	3,856
Net defined benefit pension plans	1,124	1,377	2,250	2,756	12,064	(7,750)
Forward-starting interest rate swaps (“FSIRS”):
Amounts reclassified into net income	0	414	416	827	1,241	2,023
Net forward-starting interest rate swaps	0	414	416	827	1,241	2,023
Foreign currency translation adjustments	(2,680)	909	(1,433)	1,732	(3,145)	5,656
Total other comprehensive income (loss), net of tax	(1,556)	2,700	1,233	5,315	10,160	(71)
Comprehensive income (loss)	(7,637)	29,174	92,402	150,634	163,212	271,347
Comprehensive income attributable to noncontrolling interests	494	1,355	1,566	2,907	5,082	7,189
Comprehensive income (loss) attributable to Southwest Gas Holdings, Inc.	$ (8,131)	$ 27,819	$ 90,836	$ 147,727	$ 158,130	$ 264,158

XML

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
CASH FLOW FROM OPERATING ACTIVITIES:
Net income	$ 91,169	$ 145,319	$ 153,052	$ 271,418
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	230,656	176,290	425,407	343,447
Deferred income taxes	30,163	44,178	47,197	63,774
Changes in current assets and liabilities:
Accounts receivable, net of allowances	(42,212)	10,005	(103,771)	(29,021)
Accrued utility revenue	44,900	43,900	(1,500)	(2,700)
Deferred purchased gas costs	(64,176)	(287,687)	(120,217)	(305,043)
Accounts payable	(33,356)	(41,075)	58,145	(1,571)
Accrued taxes	(5,023)	(3,164)	(8,584)	2,988
Other current assets and liabilities	16,480	(31,928)	(40,801)	(3,039)
Gains on sale of property and equipment	(3,475)	(4,033)	(6,348)	(5,572)
Changes in undistributed stock compensation	7,036	5,736	10,594	8,518
Equity AFUDC	(575)	0	(575)	(2,543)
Changes in deferred charges and other assets	13,736	(11,171)	11,366	(35,494)
Changes in other liabilities and deferred credits	(21,705)	(45,013)	(50,321)	(52,865)
Net cash provided by operating activities	263,618	1,357	373,644	252,297
CASH FLOW FROM INVESTING ACTIVITIES:
Construction expenditures and property additions	(367,932)	(338,049)	(745,509)	(739,719)
Acquisition of businesses, net of cash acquired	(18,809)	0	(2,373,069)	0
Changes in customer advances	17,051	7,507	25,518	17,442
Other	3,905	9,159	13,002	13,367
Net cash used in investing activities	(365,785)	(321,383)	(3,080,058)	(708,910)
CASH FLOW FROM FINANCING ACTIVITIES:
Issuance of common stock, net	456,280	121,302	548,619	205,049
Centuri distribution to redeemable noncontrolling interest	(39,649)	0	(39,649)	0
Dividends paid	(77,419)	(67,130)	(148,511)	(131,189)
Issuance of long-term debt, net	759,602	82,245	2,338,053	124,319
Retirement of long-term debt	(412,263)	(60,500)	(804,427)	(299,370)
Change in credit facility and commercial paper	(130,000)	0	(150,000)	150,000
Change in short-term debt	(446,253)	211,000	(705,253)	260,000
Issuance of short-term debt	0	0	1,850,000	0
Withholding remittance - share-based compensation	(2,089)	(1,243)	(2,110)	(1,243)
Other	(12,811)	(1,623)	(11,917)	(3,565)
Net cash provided by financing activities	95,398	284,051	2,874,805	304,001
Effects of currency translation on cash and cash equivalents	35	188	7	586
Change in cash and cash equivalents	(6,734)	(35,787)	168,398	(152,026)
Cash and cash equivalents at beginning of period	222,697	83,352	47,565	199,591
Cash and cash equivalents at end of period	215,963	47,565	215,963	47,565
SUPPLEMENTAL INFORMATION:
Interest paid, net of amounts capitalized	92,297	47,475	149,174	101,227
Income taxes paid (received), net	$ 8,300	$ 6,659	$ 5,849	$ 15,118

XML

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common stock shares	Additional paid-in capital	Accumulated other comprehensive loss	Retained earnings	Southwest Gas Holdings, Inc.
Beginning balance (in shares) at Dec. 31, 2020		57,193,000
Beginning balance at Dec. 31, 2020		$ 58,823	$ 1,609,155	$ (61,003)	$ 1,067,978
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issuances (in shares)		1,895,000
Common stock issuances		$ 1,895	124,417
Foreign currency exchange translation adjustment				1,732
Net actuarial gain arising during period, less amortization of unamortized benefit plan cost, net of tax				2,756
FSIRS amounts reclassified to net income, net of tax	$ 827			827
Net income (loss)					142,412
Dividends declared					(70,205)
Redemption value adjustments					(31,906)
Ending balance (in shares) at Jun. 30, 2021		59,088,000
Ending balance at Jun. 30, 2021		$ 60,718	1,733,572	(55,688)	1,108,279	$ 2,846,881
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share (in USD per share)	$ 1.19
Beginning balance (in shares) at Mar. 31, 2021		57,995,000
Beginning balance at Mar. 31, 2021		$ 59,625	1,660,108	(58,388)	1,112,377
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issuances (in shares)		1,093,000
Common stock issuances		$ 1,093	73,464
Foreign currency exchange translation adjustment				909
Net actuarial gain arising during period, less amortization of unamortized benefit plan cost, net of tax				1,377
FSIRS amounts reclassified to net income, net of tax	$ 414			414
Net income (loss)					25,119
Dividends declared					(35,329)
Redemption value adjustments					6,112
Ending balance (in shares) at Jun. 30, 2021		59,088,000
Ending balance at Jun. 30, 2021		$ 60,718	1,733,572	(55,688)	1,108,279	2,846,881
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share (in USD per share)	$ 0.595
FSIRS amounts reclassified to net income, net of tax	$ 1,241
Ending balance (in shares) at Jun. 30, 2022	67,003,792	67,004,000
Ending balance at Jun. 30, 2022		$ 68,634	2,279,493	(45,528)	1,156,253	3,458,852
Beginning balance (in shares) at Dec. 31, 2021	60,422,081	60,422,000
Beginning balance at Dec. 31, 2021		$ 62,052	1,824,216	(46,761)	1,114,313
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issuances (in shares)		6,582,000
Common stock issuances		$ 6,582	455,277
Foreign currency exchange translation adjustment				(1,433)
Net actuarial gain arising during period, less amortization of unamortized benefit plan cost, net of tax				2,250
FSIRS amounts reclassified to net income, net of tax	$ 416			416
Net income (loss)					89,603
Dividends declared					(83,641)
Redemption value adjustments	$ (35,978)				35,978
Ending balance (in shares) at Jun. 30, 2022	67,003,792	67,004,000
Ending balance at Jun. 30, 2022		$ 68,634	2,279,493	(45,528)	1,156,253	3,458,852
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share (in USD per share)	$ 1.24
Beginning balance (in shares) at Mar. 31, 2022		66,849,000
Beginning balance at Mar. 31, 2022		$ 68,479	2,273,837	(43,972)	1,190,738
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issuances (in shares)		155,000
Common stock issuances		$ 155	5,656
Foreign currency exchange translation adjustment				(2,680)
Net actuarial gain arising during period, less amortization of unamortized benefit plan cost, net of tax				1,124
FSIRS amounts reclassified to net income, net of tax	$ 0			0
Net income (loss)					(6,575)
Dividends declared					(41,732)
Redemption value adjustments					13,822
Ending balance (in shares) at Jun. 30, 2022	67,003,792	67,004,000
Ending balance at Jun. 30, 2022		$ 68,634	$ 2,279,493	$ (45,528)	$ 1,156,253	$ 3,458,852
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per share (in USD per share)	$ 0.62

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CONDENSED CONSOLIDATED BALANCE SHEETS - Southwest - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
ASSETS
Gas plant	$ 11,049,050	$ 10,789,690
Less: accumulated depreciation	(3,496,191)	(3,397,736)
Construction work in progress	218,638	202,068
Net regulated operations plant	7,771,497	7,594,022
Other property and investments, net	1,312,701	1,316,479
Current assets:
Cash and cash equivalents	215,963	222,697
Accounts receivable, net of allowance	750,794	707,127
Accrued utility revenue	40,000	84,900
Income taxes receivable, net	19,147	16,816
Deferred purchased gas costs	354,571	291,145
Prepaid and other current assets	263,363	292,082
Total current assets	1,643,838	1,614,767
Noncurrent assets:
Goodwill	1,750,472	1,781,332
Deferred charges and other assets	444,332	458,536
Total noncurrent assets	2,194,972	2,239,989
Total assets	12,923,008	12,765,257
Capitalization:
Common stock	68,634	62,052
Additional paid-in capital	2,279,493	1,824,216
Accumulated other comprehensive loss, net	(45,528)	(46,761)
Retained earnings	1,156,253	1,114,313
Total equity	3,458,852	2,953,820
Long-term debt, less current maturities	4,588,454	4,115,684
Total capitalization	8,169,962	7,266,221
Current liabilities:
Current maturities of long-term debt	41,276	297,324
Short-term debt	1,462,747	1,909,000
Accounts payable	306,753	353,365
Customer deposits	53,991	59,327
Accrued general taxes	55,883	53,473
Accrued interest	35,697	30,964
Other current liabilities	387,359	396,126
Total current liabilities	2,350,417	3,112,049
Deferred income taxes and other credits:
Deferred income taxes and investment tax credits, net	785,258	768,868
Accumulated removal costs	494,554	480,583
Other deferred credits and other long-term liabilities	1,122,817	1,137,536
Total deferred income taxes and other credits	2,402,629	2,386,987
Total capitalization and liabilities	12,923,008	12,765,257
Southwest Gas Corporation
ASSETS
Gas plant	9,137,313	8,901,575
Less: accumulated depreciation	(2,613,096)	(2,538,508)
Construction work in progress	193,269	183,485
Net regulated operations plant	6,717,486	6,546,552
Other property and investments, net	146,599	153,093
Current assets:
Cash and cash equivalents	102,143	38,691
Accounts receivable, net of allowance	141,820	169,666
Accrued utility revenue	40,000	84,900
Income taxes receivable, net	6,665	7,826
Deferred purchased gas costs	354,571	291,145
Receivable from parent	0	1,031
Prepaid and other current assets	207,545	242,243
Total current assets	852,744	835,502
Noncurrent assets:
Goodwill	10,095	10,095
Deferred charges and other assets	388,054	405,021
Total noncurrent assets	398,149	415,116
Total assets	8,114,978	7,950,263
Capitalization:
Common stock	49,112	49,112
Additional paid-in capital	1,622,006	1,618,911
Accumulated other comprehensive loss, net	(44,247)	(46,913)
Retained earnings	952,725	906,827
Total equity	2,579,596	2,527,937
Long-term debt, less current maturities	2,904,099	2,440,603
Total capitalization	5,483,695	4,968,540
Current liabilities:
Current maturities of long-term debt	0	275,000
Short-term debt	225,000	250,000
Accounts payable	143,569	234,070
Customer deposits	50,925	56,127
Accrued general taxes	51,722	53,064
Accrued interest	26,942	22,926
Payable to parent	330	0
Other current liabilities	162,151	146,422
Total current liabilities	660,639	1,037,609
Deferred income taxes and other credits:
Deferred income taxes and investment tax credits, net	676,294	638,828
Accumulated removal costs	437,000	424,000
Other deferred credits and other long-term liabilities	857,350	881,286
Total deferred income taxes and other credits	1,970,644	1,944,114
Total capitalization and liabilities	$ 8,114,978	$ 7,950,263

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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - Southwest - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Regulated operations revenues	$ 440,030	$ 292,796	$ 1,183,562	$ 814,728	$ 1,890,624	$ 1,400,052
Operating expenses:
Net cost of gas sold	147,860	76,496	446,778	232,517	645,168	347,060
Operations and maintenance	175,791	104,833	325,094	211,523	586,717	416,439
Depreciation and amortization	108,010	82,848	230,656	176,290	425,407	343,447
Taxes other than income taxes	22,606	19,338	47,422	40,025	87,740	71,765
Total operating expenses	1,100,460	762,155	2,199,375	1,474,609	4,035,670	2,972,856
Operating income	45,660	59,266	214,154	232,719	350,982	439,778
Other income and (expenses):
Net interest deductions	(53,206)	(25,939)	(101,569)	(49,903)	(170,864)	(106,550)
Other income (deductions)	(2,835)	(1,311)	(1,591)	(863)	(4,227)	5,193
Total other income and (expenses)	(56,041)	(27,250)	(103,160)	(50,766)	(175,091)	(101,357)
Income (loss) before income taxes	(10,381)	32,016	110,994	181,953	175,891	338,421
Income tax expense (benefit)	(4,300)	5,542	19,825	36,634	22,839	67,003
Net income (loss) attributable to Southwest Gas Holdings, Inc.	(6,575)	25,119	89,603	142,412	147,970	264,229
Southwest Gas Corporation
Regulated operations revenues	377,942	292,796	1,054,481	814,728	1,761,543	1,400,052
Operating expenses:
Net cost of gas sold	146,654	76,496	443,775	232,517	642,165	347,060
Operations and maintenance	127,811	103,137	247,447	209,272	476,725	413,246
Depreciation and amortization	55,930	57,631	128,044	126,329	255,113	243,701
Taxes other than income taxes	20,098	19,338	41,750	40,025	82,068	71,765
Total operating expenses	350,493	256,602	861,016	608,143	1,456,071	1,075,772
Operating income	27,449	36,194	193,465	206,585	305,472	324,280
Other income and (expenses):
Net interest deductions	(28,633)	(24,175)	(55,243)	(46,341)	(106,462)	(98,440)
Other income (deductions)	(3,433)	(1,165)	(2,118)	(615)	(6,062)	5,493
Total other income and (expenses)	(32,066)	(25,340)	(57,361)	(46,956)	(112,524)	(92,947)
Income (loss) before income taxes	(4,617)	10,854	136,104	159,629	192,948	231,333
Income tax expense (benefit)	(2,351)	(559)	26,575	29,501	26,412	37,628
Net income (loss) attributable to Southwest Gas Holdings, Inc.	$ (2,266)	$ 11,413	$ 109,529	$ 130,128	$ 166,536	$ 193,705

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - Southwest - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income (loss)	$ (6,081)	$ 26,474	$ 91,169	$ 145,319	$ 153,052	$ 271,418
Defined benefit pension plans:
Net actuarial gain (loss)	0	0	0	0	44,974	(43,730)
Amortization of prior service cost	33	182	66	364	431	802
Amortization of net actuarial loss	6,615	8,472	13,231	16,946	30,179	31,322
Regulatory adjustment	(5,524)	(7,277)	(11,047)	(14,554)	(63,520)	3,856
Net defined benefit pension plans	1,124	1,377	2,250	2,756	12,064	(7,750)
Forward-starting interest rate swaps (“FSIRS”):
FSIRS amounts reclassified to net income, net of tax	0	414	416	827	1,241	2,023
Net forward-starting interest rate swaps	0	414	416	827	1,241	2,023
Total other comprehensive income (loss), net of tax	(1,556)	2,700	1,233	5,315	10,160	(71)
Comprehensive income (loss)	(7,637)	29,174	92,402	150,634	163,212	271,347
Foreign currency translation adjustments	(2,680)	909	(1,433)	1,732	(3,145)	5,656
Comprehensive income attributable to noncontrolling interests	494	1,355	1,566	2,907	5,082	7,189
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(8,131)	27,819	90,836	147,727	158,130	264,158
Southwest Gas Corporation
Net income (loss)	(2,266)	11,413	109,529	130,128	166,536	193,705
Defined benefit pension plans:
Net actuarial gain (loss)	0	0	0	0	44,974	(43,730)
Amortization of prior service cost	33	182	66	364	431	802
Amortization of net actuarial loss	6,615	8,472	13,231	16,946	30,179	31,322
Regulatory adjustment	(5,524)	(7,277)	(11,047)	(14,554)	(63,520)	3,856
Net defined benefit pension plans	1,124	1,377	2,250	2,756	12,064	(7,750)
Forward-starting interest rate swaps (“FSIRS”):
FSIRS amounts reclassified to net income, net of tax	0	414	416	827	1,241	2,023
Net forward-starting interest rate swaps	0	414	416	827	1,241	2,023
Total other comprehensive income (loss), net of tax	1,124	1,791	2,666	3,583	13,305	(5,727)
Comprehensive income (loss)	$ (1,142)	$ 13,204	$ 112,195	$ 133,711	$ 179,841	$ 187,978

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - Southwest - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
CASH FLOW FROM OPERATING ACTIVITIES:
Net income (loss)	$ 91,169	$ 145,319	$ 153,052	$ 271,418
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	230,656	176,290	425,407	343,447
Deferred income taxes	30,163	44,178	47,197	63,774
Changes in current assets and liabilities:
Accounts receivable, net of allowance	(42,212)	10,005	(103,771)	(29,021)
Accrued utility revenue	44,900	43,900	(1,500)	(2,700)
Deferred purchased gas costs	(64,176)	(287,687)	(120,217)	(305,043)
Accounts payable	(33,356)	(41,075)	58,145	(1,571)
Accrued taxes	(5,023)	(3,164)	(8,584)	2,988
Other current assets and liabilities	16,480	(31,928)	(40,801)	(3,039)
Gain on sale of property	(3,475)	(4,033)	(6,348)	(5,572)
Changes in undistributed stock compensation	7,036	5,736	10,594	8,518
Equity AFUDC	(575)	0	(575)	(2,543)
Changes in deferred charges and other assets	13,736	(11,171)	11,366	(35,494)
Changes in other liabilities and deferred credits	(21,705)	(45,013)	(50,321)	(52,865)
Net cash provided by operating activities	263,618	1,357	373,644	252,297
CASH FLOW FROM INVESTING ACTIVITIES:
Construction expenditures and property additions	(367,932)	(338,049)	(745,509)	(739,719)
Changes in customer advances	17,051	7,507	25,518	17,442
Other	3,905	9,159	13,002	13,367
Net cash used in investing activities	(365,785)	(321,383)	(3,080,058)	(708,910)
CASH FLOW FROM FINANCING ACTIVITIES:
Dividends paid	(77,419)	(67,130)	(148,511)	(131,189)
Issuance of long-term debt, net	759,602	82,245	2,338,053	124,319
Retirement of long-term debt	(412,263)	(60,500)	(804,427)	(299,370)
Change in credit facility and commercial paper	(130,000)	0	(150,000)	150,000
Withholding remittance - share-based compensation	(2,089)	(1,243)	(2,110)	(1,243)
Other	(12,811)	(1,623)	(11,917)	(3,565)
Net cash provided by financing activities	95,398	284,051	2,874,805	304,001
Change in cash and cash equivalents	(6,734)	(35,787)	168,398	(152,026)
Cash and cash equivalents at beginning of period	222,697	83,352	47,565	199,591
Cash and cash equivalents at end of period	215,963	47,565	215,963	47,565
SUPPLEMENTAL INFORMATION:
Interest paid, net of amounts capitalized	92,297	47,475	149,174	101,227
Income taxes paid (received), net	8,300	6,659	5,849	15,118
Southwest Gas Corporation
CASH FLOW FROM OPERATING ACTIVITIES:
Net income (loss)	109,529	130,128	166,536	193,705
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	128,044	126,329	255,113	243,701
Deferred income taxes	36,624	38,178	51,683	64,989
Changes in current assets and liabilities:
Accounts receivable, net of allowance	27,846	28,018	(22,978)	(25,096)
Accrued utility revenue	44,900	43,900	(1,500)	(2,700)
Deferred purchased gas costs	(63,426)	(287,687)	(119,467)	(305,043)
Accounts payable	(72,201)	(56,518)	42,081	6,812
Accrued taxes	(181)	2,401	5,171	(16,872)
Other current assets and liabilities	46,730	4,549	(28,090)	(18,418)
Gain on sale of property	(1,503)	0	(1,503)	0
Changes in undistributed stock compensation	4,459	4,159	6,692	5,959
Equity AFUDC	(157)	0	(157)	(2,543)
Changes in deferred charges and other assets	2,529	(17,540)	(8,674)	(48,142)
Changes in other liabilities and deferred credits	(22,230)	(45,309)	(49,307)	(55,272)
Net cash provided by operating activities	240,963	(29,392)	295,600	41,080
CASH FLOW FROM INVESTING ACTIVITIES:
Construction expenditures and property additions	(293,197)	(276,109)	(619,071)	(613,824)
Changes in customer advances	17,051	7,507	25,517	17,442
Other	(896)	6	(934)	677
Net cash used in investing activities	(277,042)	(268,596)	(594,488)	(595,705)
CASH FLOW FROM FINANCING ACTIVITIES:
Contributions from parent	0	115,641	86,942	194,063
Dividends paid	(60,200)	(53,500)	(118,100)	(106,900)
Issuance of long-term debt, net	593,862	0	891,180	0
Retirement of long-term debt	(275,000)	0	(275,000)	(125,000)
Change in credit facility and commercial paper	(130,000)	0	(150,000)	150,000
Change in short-term debt	(25,000)	234,000	(66,000)	291,000
Withholding remittance - share-based compensation	(1,996)	(1,242)	(2,017)	(1,242)
Other	(2,135)	(263)	(3,692)	(362)
Net cash provided by financing activities	99,531	294,636	363,313	401,559
Change in cash and cash equivalents	63,452	(3,352)	64,425	(153,066)
Cash and cash equivalents at beginning of period	38,691	41,070	37,718	190,784
Cash and cash equivalents at end of period	102,143	37,718	102,143	37,718
SUPPLEMENTAL INFORMATION:
Interest paid, net of amounts capitalized	51,312	44,834	96,718	94,984
Income taxes paid (received), net	$ 5	$ 0	$ (13,524)	$ 3,359

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CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - Southwest - USD ($) $ in Thousands	Total	Southwest Gas Corporation	Common stock shares	Common stock shares Southwest Gas Corporation	Additional paid-in capital	Additional paid-in capital Southwest Gas Corporation	Accumulated other comprehensive loss	Accumulated other comprehensive loss Southwest Gas Corporation	Retained earnings	Retained earnings Southwest Gas Corporation
Beginning balance (in shares) at Dec. 31, 2020			57,193,000
Beginning balance at Dec. 31, 2020			$ 58,823		$ 1,609,155	$ 1,410,345	$ (61,003)	$ (61,135)	$ 1,067,978	$ 835,146
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)									142,412	130,128
Share-based compensation						3,433				(517)
Contributions from Southwest Gas Holdings, Inc.						115,641
Dividends declared to Southwest Gas Holdings, Inc.									(70,205)	(56,000)
Net actuarial gain arising during period, less amortization of unamortized benefit plan cost, net of tax							2,756	2,756
FSIRS amounts reclassified to net income, net of tax	$ 827	$ 827					827	827
Ending balance (in shares) at Jun. 30, 2021			59,088,000	47,482,000
Ending balance at Jun. 30, 2021		2,429,736	$ 60,718	$ 49,112	1,733,572	1,529,419	(55,688)	(57,552)	1,108,279	908,757
Beginning balance (in shares) at Mar. 31, 2021			57,995,000
Beginning balance at Mar. 31, 2021			$ 59,625		1,660,108	1,458,344	(58,388)	(59,343)	1,112,377	926,011
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)									25,119	11,413
Share-based compensation						1,418				(167)
Contributions from Southwest Gas Holdings, Inc.						69,657
Dividends declared to Southwest Gas Holdings, Inc.									(35,329)	(28,500)
Net actuarial gain arising during period, less amortization of unamortized benefit plan cost, net of tax							1,377	1,377
FSIRS amounts reclassified to net income, net of tax	414	414					414	414
Ending balance (in shares) at Jun. 30, 2021			59,088,000	47,482,000
Ending balance at Jun. 30, 2021		2,429,736	$ 60,718	$ 49,112	1,733,572	1,529,419	(55,688)	(57,552)	1,108,279	908,757
Increase (Decrease) in Stockholders' Equity [Roll Forward]
FSIRS amounts reclassified to net income, net of tax	$ 1,241	1,241
Ending balance (in shares) at Jun. 30, 2022	67,003,792		67,004,000	47,482,000
Ending balance at Jun. 30, 2022		2,579,596	$ 68,634	$ 49,112	2,279,493	1,622,006	(45,528)	(44,247)	1,156,253	952,725
Beginning balance (in shares) at Dec. 31, 2021	60,422,081		60,422,000
Beginning balance at Dec. 31, 2021			$ 62,052		1,824,216	1,618,911	(46,761)	(46,913)	1,114,313	906,827
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)									89,603	109,529
Share-based compensation						3,095				(631)
Contributions from Southwest Gas Holdings, Inc.						0
Dividends declared to Southwest Gas Holdings, Inc.									(83,641)	(63,000)
Net actuarial gain arising during period, less amortization of unamortized benefit plan cost, net of tax							2,250	2,250
FSIRS amounts reclassified to net income, net of tax	$ 416	416					416	416
Ending balance (in shares) at Jun. 30, 2022	67,003,792		67,004,000	47,482,000
Ending balance at Jun. 30, 2022		2,579,596	$ 68,634	$ 49,112	2,279,493	1,622,006	(45,528)	(44,247)	1,156,253	952,725
Beginning balance (in shares) at Mar. 31, 2022			66,849,000
Beginning balance at Mar. 31, 2022			$ 68,479		2,273,837	1,620,616	(43,972)	(45,371)	1,190,738	987,177
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)									(6,575)	(2,266)
Share-based compensation						1,390				(186)
Contributions from Southwest Gas Holdings, Inc.						0
Dividends declared to Southwest Gas Holdings, Inc.									(41,732)	(32,000)
Net actuarial gain arising during period, less amortization of unamortized benefit plan cost, net of tax							1,124	1,124
FSIRS amounts reclassified to net income, net of tax	$ 0	0					0	0
Ending balance (in shares) at Jun. 30, 2022	67,003,792		67,004,000	47,482,000
Ending balance at Jun. 30, 2022		$ 2,579,596	$ 68,634	$ 49,112	$ 2,279,493	$ 1,622,006	$ (45,528)	$ (44,247)	$ 1,156,253	$ 952,725

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Background, Organization, and Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Background, Organization, and Summary of Significant Accounting Policies

Note 1 – Background, Organization, and Summary of Significant Accounting Policies

Nature of Operations. Southwest Gas Holdings, Inc. (together with its subsidiaries, the “Company”) is a holding company, owning all of the shares of common stock of Southwest Gas Corporation (“Southwest” or the “natural gas distribution” segment), all of the shares of common stock of Centuri Group, Inc. (“Centuri,” or the “utility infrastructure services” segment), and all of the shares of common stock of MountainWest Pipelines Holding Company (“MountainWest,” or the “pipeline and storage” segment).

The Company completed the acquisition of Dominion Energy Questar Pipeline, LLC and related entities (“Questar Pipelines”) in December 2021. Following the completion of the acquisition, the Company formed MountainWest which owns all of the membership interests in Questar Pipelines. In April 2022, the Company completed a general rebranding of the Questar Pipelines entities under the MountainWest name. The acquired operations further diversify the Company’s business in the midstream sector, with an expansion of interstate natural gas pipelines and underground storage services, primarily composed of regulated operations under the jurisdiction of the Federal Energy Regulatory Commission (the “FERC”), thereby expanding natural gas transportation services into Utah, Wyoming, and Colorado. See Note 8 - Business Acquisitions for more information.

Southwest is engaged in the business of purchasing, distributing, and transporting natural gas for customers in portions of Arizona, Nevada, and California. Public utility rates, practices, facilities, and service territories of Southwest are subject to regulatory oversight. The timing and amount of rate relief can materially impact results of operations. Natural gas purchases and the timing of related recoveries can materially impact liquidity. Results for the natural gas distribution segment are higher during winter periods due to the seasonality incorporated in its regulatory rate structures.

Centuri is a strategic utility infrastructure services company dedicated to partnering with North America’s gas and electric providers to build and maintain the energy network that powers millions of homes across the United States (“U.S.”) and Canada. Centuri derives revenue primarily from installation, replacement, repair, and maintenance of energy networks. Centuri operates in the U.S., primarily as NPL, Neuco, Linetec, and Riggs Distler, and in Canada, primarily as NPL Canada. Utility infrastructure services activity is seasonal in many of Centuri’s operating areas. Peak periods are the summer and fall months in colder climate areas, such as the northeastern and midwestern U.S. and in Canada. In warmer climate areas, such as the southwestern and southeastern U.S., utility infrastructure services activity continues year round.

Centuri completed the acquisition of Drum Parent LLC (“Drum”), including Drum’s most significant operating subsidiary, Riggs Distler, in August 2021, thereby expanding Centuri’s electric infrastructure services footprint in the northeast and mid-Atlantic regions of the U.S. See Note 8 - Business Acquisitions for more information.

In March 2022, the Company announced that its Board of Directors (the “Board”) had determined to separate Centuri from the Company and authorized management to complete the separation within nine to twelve months. Initially it was contemplated that the Centuri separation would take the form of a spin-off. Then, in April 2022, as a result of interest in the Company well in excess of an earlier tender offer to other shareholders by an activist stockholder (affiliates of Carl C. Icahn), the Board authorized the review of a full range of strategic alternatives to maximize stockholder value. As part of this process, a strategic transactions committee of the Board (the “Strategic Transactions Committee”), consisting entirely of independent directors, has been evaluating a sale of the Company, as well as a range of alternatives, including, but not limited to, a separate sale of its business units and/or pursuing the spin-off of Centuri (collectively, the “Strategic Review”). On August 3, 2022, the Company announced that the Board had unanimously determined that the best path forward to maximize value for all stockholders is to (i) focus on the strategic plan and conclude the strategic review process for Southwest Gas Holdings, Inc. and Southwest Gas Corporation; (ii) continue to review strategic alternatives for MountainWest; and (iii) continue to review strategic alternatives for Centuri, including a sale or spin-off of Centuri.

On May 6, 2022, the Company entered into a Cooperation Agreement (the “Cooperation Agreement”) with Carl C. Icahn and the persons and entities referenced therein (collectively, the “Icahn Group”). In accordance with the Cooperation Agreement, among other things, John P. Hester, President and Chief Executive Officer of the Company and Southwest, retired from his positions with the Company and Southwest and resigned from the Board. Thereafter, Karen S. Haller, the Company’s former Executive Vice President/Chief Legal and Administrative Officer, was appointed President and Chief Executive Officer of the Company and Chief Executive Officer of Southwest, and was appointed as a member of the Board effective immediately following the completion of the Company’s 2022 annual meeting of stockholders (the “2022 Annual Meeting”). Justin L. Brown, formerly Southwest’s Senior Vice President/General Counsel, was appointed as President of Southwest.

In addition, pursuant to the Cooperation Agreement, the Company agreed to appoint three new directors, Andrew W. Evans, H. Russell Frisby, Jr., and Henry P. Linginfelter (collectively, the “Icahn Designees”), to the Board, which became effective immediately following the 2022 Annual Meeting. Also pursuant to the Cooperation Agreement, on May 27, 2022, the Icahn group informed the Company that it would cause Mr. Frisby to resign from the Board and requested that Andrew J. Teno be

appointed to the Board to fill the vacancy created by Mr. Frisby’s resignation. As a result, on May 27, Mr. Frisby resigned from the Board, effective immediately, and the Board appointed Mr. Teno to fill the vacancy created by Mr. Frisby’s resignation, effective immediately. The Icahn Group’s ability to designate directors to the Board is subject to certain ownership thresholds. Consistent with the May 6, 2022 Cooperation Agreement with the Icahn Group, the Company expects José A. Cárdenas to step down from the Board in the near future, and a new director will be appointed.

The Cooperation Agreement required the Board expand the Strategic Transactions Committee from three directors to six directors, comprised of the existing members of the Strategic Transactions Committee in addition to the three Icahn Designees. Also, as the Icahn Group has the ability to designate at least three members of the Board, such individuals are to be included on the Strategic Transactions Committee. If the Icahn Group may only designate two members of the Board, then both would serve on the Strategic Transactions Committee.

On May 9, 2022, the Company also entered into Amendment No. 1 to the Rights Agreement dated October 10, 2021 (the “Original Rights Agreement” and as amended, the “Amended Rights Agreement”), to increase the triggering percentage from 10% to 24.9% pursuant to the terms of the Cooperation Agreement and permit the subsequent consummation of the Offer (as defined below). See details in the Company’s and Southwest’s Annual Report on Form 10-K for the fiscal year ended December 31, 2021 (the “2021 Form 10-K”) regarding the Original Rights Agreement, as well as Note 4 – Common Stock in this current report on Form 10-Q.

In addition, pursuant to the Cooperation Agreement, the Icahn Group is permitted to acquire up to 24.9% of the shares of the Company, which would include shares as part of an updated tender offer of $82.50 per share, with the updated tender offer expiring on May 20, 2022. An earlier civil suit (initiated in November 2021) by Icahn entities against the Company and certain directors and officers of the Company was subject to a stipulation of dismissal as part of the Cooperation Agreement. The Cooperation Agreement also provides for the reimbursement by the Company of certain out-of-pocket third-party expenses, including certain legal fees, incurred by the Icahn Group.

Basis of Presentation. The condensed consolidated financial statements of Southwest Gas Holdings, Inc. and subsidiaries and Southwest included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). The year-end 2021 condensed balance sheet data was derived from audited financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) have been condensed or omitted pursuant to such rules and regulations. No substantive change has occurred with regard to the Company’s business segments on the whole during the recently completed quarter.

The preparation of the condensed consolidated financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. In the opinion of management, all adjustments, consisting of normal recurring items and estimates necessary for a fair depiction of results for the interim periods, have been made.

These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the 2021 Annual Report to Stockholders, which is incorporated by reference into the 2021 Form 10-K.

Other Property and Investments. Other property and investments on Southwest’s and the Company’s Condensed Consolidated Balance Sheets includes:

(Thousands of dollars)	June 30, 2022		December 31, 2021
Net cash surrender value of COLI policies	$	142,819	$	149,947
Other property	3,780		3,146
Total Southwest Gas Corporation	146,599		153,093
Non-regulated property, equipment, and intangibles	1,678,683		1,616,392
Non-regulated accumulated provision for depreciation and amortization	(569,630)		(512,343)
Other property and investments	57,049		59,337
Total Southwest Gas Holdings, Inc.	$	1,312,701	$	1,316,479

Included in the table above are the net cash surrender values of company-owned life insurance (“COLI”) policies. These life insurance policies on members of management and other key employees are used by Southwest to indemnify itself against the loss of talent, expertise, and knowledge, as well as to provide indirect funding for certain nonqualified benefit plans. The term

non-regulated in regard to assets and related balances in the table above is in reference to the non-rate regulated operations of Centuri, and to a more limited extent, certain assets of MountainWest.

Cash and Cash Equivalents.  Cash and cash equivalents include money market fund investments totaling approximately $77 million and $97 million, for Southwest and the Company, respectively, at June 30, 2022, and $20 million for the Company as of December 31, 2021. The balance for Southwest as of December 31, 2021 was insignificant. These investments fall within Level 2 of the fair value hierarchy, due to the asset valuation methods used by money market funds.

Non-cash investing activities for the Company and Southwest include capital expenditures that were not yet paid, thereby remaining in accounts payable, which declined by approximately $11.6 million and $18.3 million, respectively, during the six months ended June 30, 2022, and increased $6.5 million and $6.6 million, respectively, during the twelve months ended June 30, 2022.

Accounts Receivable, net of allowances. Following an earlier moratorium on account disconnections amidst the COVID-19 environment, account collection efforts resumed in 2021 in all jurisdictions in which Southwest operates. Ultimately, some accounts may not be collected, and if so, would be written off. Estimates as to collectibility are made on an ongoing basis. However, Southwest continues to actively work with customers experiencing financial hardship by means of flexible payment options and partnering with assistance agencies. The cost of gas included in customer rates also influences account balances at each reporting date.

Deferred Purchased Gas Costs. The various regulatory commissions have established procedures to enable the rate-regulated companies to adjust billing rates for changes in the cost of natural gas purchased. The difference between the current cost of gas purchased and the cost of gas recovered in billed rates is deferred. Generally, these deferred amounts are recovered or refunded within one year.

Prepaid and other current assets. Prepaid and other current assets for Southwest include, among other things, materials and operating supplies of $70.2 million at June 30, 2022 and $62.9 million at December 31, 2021 (carried at weighted average cost). For the Company, there were materials and operating supplies of $74.5 million and $67.4 million at June 30, 2022 and December 31, 2021, respectively, which included amounts for MountainWest. Also included in the balance for both Southwest and the Company was $10.2 million and $52 million as of June 30, 2022 and December 31, 2021, respectively, in accrued purchased gas cost.

Goodwill. Goodwill is assessed as of October 1st each year for impairment, or more frequently, if circumstances indicate an impairment to the carrying value of goodwill may have occurred. Management of the Company and Southwest considered its reporting units and segments, determining that they remained consistent between periods presented below, and that no change was necessary with regard to the level at which goodwill is assessed for impairment. The acquisition of MountainWest resulted in a new reportable segment which is assessed for impairment beginning in 2022. Since December 31, 2021, management qualitatively assessed whether events during the first six months of 2022 may have resulted in conditions whereby the carrying value of goodwill was higher than its fair value, which if the case, could be an indication of a permanent impairment. Through this assessment, no such condition was believed to have existed and therefore, no impairment was deemed to have occurred. However, there can be no assurances that future assessments of goodwill will not result in an impairment, and various factors, including the results of the continuing Strategic Review related to Centuri and MountainWest, or changes in economic conditions, governmental monetary policies, interest rates, or others, on their own or in combination with the undertakings of the Strategic Review, could result in the fair value of the related reporting units being lower than their carrying value. See also Note 8 - Business Acquisitions. Goodwill in the Natural Gas Distribution operations of Southwest, and across all operations of the Company, is included in their respective Condensed Consolidated Balance Sheets as follows:

(Thousands of dollars)	Natural Gas Distribution		Utility Infrastructure Services		Pipeline and Storage		Total Company
December 31, 2021	$	10,095	$	785,058	$	986,179	$	1,781,332
Measurement-period adjustments from Riggs Distler acquisition (a)	—		(906)				(906)
Measurement-period adjustments from MountainWest acquisition (a)	—		—		(28,178)		(28,178)
Foreign currency translation adjustment	—		(1,776)		—		(1,776)
June 30, 2022	$	10,095	$	782,376	$	958,001	$	1,750,472

(a) See Note 8 - Business Acquisitions for details regarding measurement-period adjustments.

Other Current Liabilities. Management recognizes in its balance sheets various liabilities that are expected to be settled through future cash payment within the next twelve months, including amounts payable under regulatory mechanisms, customary accrued expenses for employee compensation and benefits, declared but unpaid dividends, and miscellaneous other accrued liabilities. Other current liabilities for the Company include $41.5 million and $36 million of dividends declared as of June 30, 2022 and December 31, 2021, respectively.

Other Income (Deductions). The following table provides the composition of significant items included in Other income (deductions) in Southwest’s and the Company’s Condensed Consolidated Statements of Income:

	Three Months Ended June 30,				Six Months Ended June 30,				Twelve Months Ended June 30,
(Thousands of dollars)	2022		2021		2022		2021		2022		2021
Southwest Gas Corporation:
Change in COLI policies	$	(5,200)	$	3,100	$	(7,200)	$	5,800	$	(4,200)	$	18,500
Interest income	3,198		1,231		5,999		1,947		9,165		4,160
Equity AFUDC	81		(981)		157		—		157		2,543
Other components of net periodic benefit cost	(187)		(3,505)		(375)		(7,010)		(7,386)		(17,021)
Miscellaneous income and (expense)	(1,325)		(1,010)		(699)		(1,352)		(3,798)		(2,689)
Southwest Gas Corporation - total other income (deductions)	(3,433)		(1,165)		(2,118)		(615)		(6,062)		5,493
Centuri, MountainWest, and Southwest Gas Holdings, Inc.:
Foreign transaction gain (loss)	214		(9)		217		(12)		207		(12)
Equity AFUDC	236		—		418		—		418		—
Equity in earnings of unconsolidated investments	728		109		1,243		101		1,368		156
Miscellaneous income and (expense)	(580)		(246)		(1,351)		(337)		(158)		(444)
Southwest Gas Holdings, Inc. - total other income (deductions)	$	(2,835)	$	(1,311)	$	(1,591)	$	(863)	$	(4,227)	$	5,193

Included in the table above is the change in cash surrender values of COLI policies (including net death benefits recognized). Current tax regulations provide for tax-free treatment of life insurance (death benefit) proceeds. Therefore, changes in the cash surrender values of COLI policies, as they progress towards the ultimate death benefits, are also recorded without tax consequences. Refer also to the discussion of Other Property and Investments above and to Note 2 – Components of Net Periodic Benefit Cost.

Redeemable Noncontrolling Interests. In connection with the acquisition of Linetec in November 2018, the previous owner retained a 20% equity interest in that entity, the reduction of which is subject to certain rights based on the passage of time or upon the occurrence of certain triggering events. Effective January 2022, the Company, through Centuri, had the right, but not the obligation, to purchase at fair value (subject to a floor) a portion of the interest held by the previous owner, and in incremental amounts each year thereafter. In March 2022, the parties agreed to a partial redemption based on these provisions, and as a result, Centuri paid $39.6 million to the previous owner of Linetec for a 5% equity interest in Linetec, thereby reducing the balance continuing to be redeemable to 15% under the terms of the original agreement. In order to fund the redemption, Southwest Gas Holdings, Inc. contributed capital to Centuri.

Certain members of Riggs Distler management have a 1.42% interest in Drum, which is redeemable, subject to certain rights based on the passage of time or upon the occurrence of certain triggering events.

Significant changes in the value of the redeemable noncontrolling interests, above a floor determined at the establishment date, are recognized as they occur, and the carrying value is adjusted as necessary at each reporting date. The fair value is estimated using a market approach that utilizes certain financial metrics from guideline public companies of similar industry and operating characteristics. Based on the fair value model employed, the estimated redemption value of the Linetec redeemable noncontrolling interest decreased by approximately $36 million during the six months ended June 30, 2022. Adjustment to the redemption value also impacts retained earnings, as reflected in the Company’s Condensed Consolidated Statement of Equity, but does not impact net income. The following depicts changes to the balances of the redeemable noncontrolling interests:

(Thousands of dollars):	Linetec		Drum		Total
Balance, December 31, 2021	$	184,148	$	12,569	$	196,717
Net income (loss) attributable to redeemable noncontrolling interests	1,576		(10)		1,566
Redemption value adjustments	(35,978)		—		(35,978)
Redemption of equity interest from noncontrolling party	(39,649)		—		(39,649)
Balance, June 30, 2022	$	110,097	$	12,559	$	122,656

Earnings Per Share. Basic earnings per share (“EPS”) in each period of this report were calculated by dividing net income attributable to Southwest Gas Holdings, Inc. by the weighted-average number of shares during those periods. Diluted EPS includes additional weighted-average common stock equivalents (performance shares and restricted stock units). Unless otherwise noted, the term “Earnings Per Share” refers to Basic EPS. A reconciliation of the denominator used in Basic and Diluted EPS calculations is shown in the following table:

	Three Months Ended June 30,		Six Months Ended June 30,		Twelve Months Ended June 30,
(In thousands)	2022	2021	2022	2021	2022	2021
Weighted average basic shares	67,045	58,607	63,909	58,106	62,022	57,348
Effect of dilutive securities:
Restricted stock units (1)	145	103	132	91	135	92
Weighted average diluted shares	67,190	58,710	64,041	58,197	62,157	57,440

(1) The number of securities included 136,000 and 95,000 performance shares during the three months ending June 30, 2022 and 2021, 125,000 and 85,000 performance shares during the six months ending June 30, 2022 and 2021 and 124,000 and 83,000 performance shares during the twelve months ending June 30, 2022 and 2021, respectively, the total of which was derived by assuming that target performance will be achieved during the relevant performance period.

Contingencies. Southwest maintains liability insurance for various risks associated with the operation of its natural gas pipelines and facilities. In connection with these liability insurance policies, Southwest is responsible for an initial deductible or self-insured retention amount per incident, after which the insurance carriers would be responsible for amounts up to the policy limits. For the policy year August 2021 to July 2022, these liability insurance policies require Southwest to be responsible for the first $1 million (self-insured retention) of each incident plus the first $4 million in aggregate claims above its self-insured retention in the policy year. In August 2021, a natural gas pipe operated by Southwest was involved in an explosion that injured four individuals and damaged property. The explosion was caused by a leak in the pipe, and is under investigation. Individuals that were injured have each brought legal claims against Southwest and other parties. If Southwest is deemed fully or partially responsible, Southwest estimates its net exposure could be equal to the self-insured retention of $5 million (the maximum noted above). In 2021, pursuant to Accounting Standards Codification 450, Contingencies, Southwest recorded a $5 million liability related to this incident reflecting the maximum noted above; an estimate of actual loss greater than this exposure (to be covered by insurance) cannot be estimated as of the date these financial statements are issued.

Other contingencies are also recognized where appropriate, if claims are brought, or expected to be brought, against the Company or Southwest, where management expects it may settle (or be required to settle) claims in cash, or in some cases, by means of insurance indemnification. The balance of such reserves was updated for additional accruals, including in regard to a contract dispute. For that item, $6.2 million was recorded during the second quarter of 2022, based on management’s estimate of Southwest’s exposure.

As described above, the November 2021 civil suit filed by the Icahn Group, against the Company and certain officers and directors, was subject to a stipulation of dismissal with prejudice in May 2022, pursuant to the terms of the Cooperation Agreement.

On November 18, 2021, the City Pension Fund for Firefighters and Police Officers in the City of Miami Beach (“City Pension Fund”) commenced a putative class action lawsuit in the Court of Chancery for the State of Delaware on behalf of a putative class of persons who purchased the Company’s stock. The complaint was later amended on November 30, 2021. The amended complaint named the Company and the individual members of the Board as defendants. The complaint sought to assert breach of fiduciary duty claims, alleging that the Board’s recommendation that stockholders reject Icahn’s Offer to purchase shares of the Company’s common stock omitted material information about the Company’s financial analysis; and sought to have the Board approve Icahn’s slate of nominees as “continuing directors” under certain of the Company’s debt instruments. In March 2022, the City Pension Fund filed a motion for summary judgment on its claim; however, in April 2022, the City Pension Fund

filed a notice of withdrawal of its motion for summary judgment. The Company believes that the claims lack merit and intends to vigorously defend against them.

Recent Accounting Standards Updates.

Accounting pronouncements effective or adopted in 2022:

In March 2020, the Financial Accounting Standards Board (the “FASB”) issued ASU 2020-04 “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” The update provides optional guidance for a limited time to ease the potential burden in accounting for, or recognizing the effects of, reference rate reform on financial reporting, including when modifying a contract (during the eligibility period covered by the update to Topic 848) to replace a reference rate affected by such reform. The update applies only to contracts and hedging relationships that reference the London Interbank Offered Rate (“LIBOR”) or another rate expected to be discontinued due to reference rate reform. The guidance was eligible to be applied upon issuance on March 12, 2020, and can generally be applied through December 31, 2022, and while a proposal by the FASB has occurred to extend the optional guidance to the full tenor of LIBOR expiration dates occurring after 2022, to date, no such update has been made effective. Management will monitor the impacts this update might have on the Company’s and Southwest’s consolidated financial statements and disclosures, and will reflect such appropriately, in the event that the optional guidance is elected. Management will also monitor further FASB action, if any, in regard to the full tenor of LIBOR expiration dates. See also LIBOR discussion in Note 5 – Debt.

In August 2020, the FASB issued ASU 2020-06 “Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging— Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity.” The update, amongst other amendments, improves the guidance related to the disclosures and earnings-per-share for convertible instruments and contracts in an entity’s own equity. The Company and Southwest adopted the update in the first quarter of 2022, the impact of which was not material to the consolidated financial statements of the Company or Southwest.

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Components of Net Periodic Benefit Cost

6 Months Ended

Jun. 30, 2022

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost

Note 2 – Components of Net Periodic Benefit Cost

Southwest has a noncontributory qualified retirement plan with defined benefits covering substantially all employees and a separate unfunded supplemental retirement plan (“SERP”) which is limited to officers. Southwest also provides postretirement benefits other than pensions (“PBOP”) to its qualified retirees for health care, dental, and life insurance. The defined benefit qualified retirement plan, SERP, and PBOP are not available to Southwest employees hired on or after January 1, 2022. Employees hired in 2022 or later periods are eligible for enhanced defined contributions as part of the Southwest 401(k) plan, rather than participating in the defined benefit retirement plan.

The service cost component of net periodic benefit costs included in the table below is a component of an overhead loading process associated with the cost of labor. The overhead process ultimately results in allocation of service cost to the same accounts to which productive labor is charged. As a result, service costs become components of various accounts, primarily operations and maintenance expense, net regulated operations plant, and deferred charges and other assets for both the Company and Southwest. The other components of net periodic benefit cost are reflected in Other income (deductions) on the Condensed Consolidated Statements of Income of each entity.

	Qualified Retirement Plan
	June 30,
	Three Months				Six Months				Twelve Months
	2022		2021		2022		2021		2022		2021
(Thousands of dollars)
Service cost	$	11,028	$	10,290	$	22,056	$	20,580	$	42,635	$	37,730
Interest cost	11,251		10,108		22,502		20,216		42,718		42,994
Expected return on plan assets	(19,978)		(18,088)		(39,956)		(36,176)		(76,132)		(68,824)
Amortization of net actuarial loss	8,117		10,489		16,234		20,978		37,211		38,990
Net periodic benefit cost	$	10,418	$	12,799	$	20,836	$	25,598	$	46,432	$	50,890
	SERP
	June 30,
	Three Months				Six Months				Twelve Months
	2022		2021		2022		2021		2022		2021
(Thousands of dollars)
Service cost	$	106	$	132	$	212	$	263	$	475	$	457
Interest cost	360		358		720		716		1,435		1,517
Amortization of net actuarial loss	587		660		1,175		1,320		2,497		2,223
Net periodic benefit cost	$	1,053	$	1,150	$	2,107	$	2,299	$	4,407	$	4,197
	PBOP
	June 30,
	Three Months				Six Months				Twelve Months
	2022		2021		2022		2021		2022		2021
(Thousands of dollars)
Service cost	$	485	$	423	$	970	$	846	$	1,815	$	1,636
Interest cost	613		548		1,226		1,096		2,323		2,388
Expected return on plan assets	(807)		(810)		(1,614)		(1,620)		(3,233)		(3,324)
Amortization of prior service costs	44		240		88		480		567		1,057
Net periodic benefit cost	$	335	$	401	$	670	$	802	$	1,472	$	1,757

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Revenue

6 Months Ended

Jun. 30, 2022

Revenue from Contract with Customer [Abstract]

Revenue

Note 3 – Revenue

The following information about the Company’s revenues is presented by segment. Southwest encompasses the natural gas distribution segment, Centuri encompasses the utility infrastructure services segment, and MountainWest encompasses the pipeline and storage segment. Certain disclosures, where materially consistent with those provided most recently in the 2021 Form 10-K, are not repeated below.

Natural Gas Distribution Segment:

Southwest’s operating revenues included on the Condensed Consolidated Statements of Income of both the Company and Southwest include revenue from contracts with customers, which is shown below, disaggregated by customer type, in addition to other categories of revenue:

	Three Months Ended June 30,				Six Months Ended June 30,				Twelve Months Ended June 30,
(Thousands of dollars)	2022		2021		2022		2021		2022		2021
Residential	$	228,573	$	193,322	$	743,159	$	596,465	$	1,182,306	$	995,132
Small commercial	78,730		56,093		202,714		137,491		335,437		235,114
Large commercial	20,989		13,158		41,150		25,831		72,690		47,818
Industrial/other	10,773		6,974		20,745		20,744		42,314		33,785
Transportation	24,466		21,797		51,098		46,333		97,005		90,307
Revenue from contracts with customers	363,531		291,344		1,058,866		826,864		1,729,752		1,402,156
Alternative revenue program revenues (deferrals)	11,022		(1,531)		(12,477)		(17,904)		18,608		(6,110)
Other revenues (1)	3,389		2,983		8,092		5,768		13,183		4,006
Total Regulated operations revenues	$	377,942	$	292,796	$	1,054,481	$	814,728	$	1,761,543	$	1,400,052

(1) Amounts include late fees and other miscellaneous revenues, and may also include the impact of certain regulatory mechanisms, such as cost-of-service components in customer rates expected to be returned to customers in future periods. Also includes the impacts of a temporary moratorium on late fees and disconnection for nonpayment during the COVID-19 pandemic.

Utility Infrastructure Services Segment:

The following tables display Centuri’s revenue, reflected as Utility infrastructure services revenues on the Condensed Consolidated Statements of Income of the Company, representing revenue from contracts with customers disaggregated by service and contract types:

	Three Months Ended June 30,				Six Months Ended June 30,				Twelve Months Ended June 30,
(Thousands of dollars)	2022		2021		2022		2021		2022		2021
Service Types:
Gas infrastructure services	$	418,869	$	346,877	$	679,551	$	568,714	$	1,413,177	$	1,282,008
Electric power infrastructure services	179,749		97,644		361,717		191,605		695,314		435,825
Other	107,472		84,104		188,699		132,281		387,537		294,749
Total Utility infrastructure services revenues	$	706,090	$	528,625	$	1,229,967	$	892,600	$	2,496,028	$	2,012,582

	Three Months Ended June 30,				Six Months Ended June 30,					Twelve Months Ended June 30,
(Thousands of dollars)	2022		2021		2022			2021		2022			2021
Contract Types:
Master services agreement	$	617,489	$	398,650	$	1,062,834	*	$	692,330	$	2,023,482	*	$	1,543,292
Bid contract	88,601		129,975		167,133		*	200,270		472,546		*	469,290
Total Utility infrastructure services revenues	$	706,090	$	528,625	$	1,229,967		$	892,600	$	2,496,028		$	2,012,582
Unit price contracts	$	421,927	$	361,926	$	724,450		$	596,375	$	1,497,157		$	1,344,626
Fixed price contracts	128,793		50,455		215,330			85,049		398,023			179,194
Time and materials contracts	155,370		116,244		290,187			211,176		600,848			488,762
Total Utility infrastructure services revenues	$	706,090	$	528,625	$	1,229,967		$	892,600	$	2,496,028		$	2,012,582

* The Company identified an error in the first quarter 2022 disclosure which resulted in an understatement of $88.8 million in the master services agreement category and an overstatement by the same amount in the bid contract category. Management concluded this item was not material to the previously issued financial statements and will revise the first quarter 2022 amounts in future filings.

The following table provides information about contracts receivable and revenue earned on contracts in progress in excess of billings (contract assets), both of which are included within Accounts receivable, net of allowances, as well as amounts billed in excess of revenue earned on contracts (contract liabilities), which are included in Other current liabilities as of June 30, 2022 and December 31, 2021 on the Company’s Condensed Consolidated Balance Sheets:

(Thousands of dollars)	June 30, 2022		December 31, 2021
Contracts receivable, net	$	332,433	$	296,005
Revenue earned on contracts in progress in excess of billings	254,259		214,774
Amounts billed in excess of revenue earned on contracts	13,738		11,860

The revenue earned on contracts in progress in excess of billings (contract asset) primarily relates to Centuri’s right to consideration for work completed but not billed and/or approved for billing at the reporting date. These contract assets are transferred to contracts receivable when the rights become unconditional. The amounts billed in excess of revenue earned (contract liability) primarily relate to the advance consideration received from customers for which work has not yet been completed. The change in this contract liability balance from December 31, 2021 to June 30, 2022 is due to increases in cash received, net of revenue recognized, from contracts that commenced during the period, offset by revenue recognized of approximately $11.9 million that was included in this balance as of January 1, 2022, after which time it became earned and the balance was reduced.

For contracts that have an original duration of one year or less, Centuri uses the practical expedient applicable to such contracts and does not consider/compute an interest component based on the time value of money. Furthermore, because of the short duration of these contracts, Centuri has not disclosed the transaction price for the remaining performance obligations as of the end of each reporting period or when the Company expects to recognize the revenue.

As of June 30, 2022, Centuri had 47 fixed price contracts with an original duration of more than one year. The aggregate amount of the transaction price allocated to the unsatisfied performance obligations of these contracts as of June 30, 2022 was $465.7 million. Centuri expects to recognize the remaining performance obligations over approximately the next 2.9 years; however, the timing of that recognition is largely within the control of the customer, including when the necessary equipment and materials required to complete the work are provided by the customer.

Utility infrastructure services contracts receivable consists of the following:

(Thousands of dollars)	June 30, 2022		December 31, 2021
Billed on completed contracts and contracts in progress	$	331,173	$	292,770
Other receivables	1,408		3,492
Contracts receivable, gross	332,581		296,262
Allowance for doubtful accounts	(148)		(257)
Contracts receivable, net	$	332,433	$	296,005

Pipeline and Storage Segment:

MountainWest derives revenue on the basis of services rendered, commodities delivered, or contracts settled and includes amounts yet to be billed to customers. MountainWest generates revenue and earnings from annual reservation payments under firm peaking storage and firm transportation contracts. Straight-fixed-variable rate designs are used to allow for recovery of substantially all fixed costs in demand or reservation charges, thereby reducing the earnings impact of volume changes on gas transportation and storage operations.

MountainWest receives upfront payment for certain storage services it provides to customers, which are considered to be contract liabilities. These payments are amortized to revenue over the term of the contract.

The primary types of sales and service activities reported as revenue from contracts with customers are FERC-regulated gas transportation and storage services, and to a lesser extent, natural gas liquid (“NGL”) revenues consisting primarily of NGL processing services, and other revenue (consisting of natural gas sales, as well as services related to gathering and processing activities and miscellaneous service revenue).

Transportation and storage contracts are primarily stand-ready service contracts that include fixed reservation and variable usage fees. Fixed fees are recognized ratably over the life of the contract as the stand-ready performance obligations are satisfied, while variable usage fees are recognized when MountainWest has a right to consideration from a customer in an amount that corresponds directly with the value to the customer of the performance obligation completed to date. Substantially all of MountainWest’s revenues are derived from performance obligations satisfied over time, rather than recognized at a single point in time. Payment for most sales and services varies by contract type, but is typically due within a month of billing.

MountainWest typically receives or retains NGLs and natural gas from customers when providing natural gas processing, transportation, or storage services. MountainWest records the fair value of NGLs received as service revenue recognized over time and recognizes revenue from the subsequent sale of the NGLs to customers upon delivery. MountainWest typically retains some natural gas under certain transportation service arrangements, intended to facilitate performance of the service and allow for natural losses that occur. As the intent of the retention amount is to enable fulfillment of the contract rather than to provide compensation for services, the fuel allowance is not included in revenue.

MountainWest Regulated operations revenues on the Condensed Consolidated Statements of Income of the Company include revenue from contracts with customers, which is shown below, disaggregated by categories of sales and service activities.

	Three Months Ended June 30,		Six Months Ended June 30,
(Thousands of dollars)	2022
Regulated gas transportation and storage revenues	$	57,786	119,763
NGL revenues	1,876		3,369
Other revenues	2,380		5,859
Revenue from contracts with customers	62,042		128,991
Other revenues	46		90
Total Regulated operations revenues	$	62,088	129,081

MountainWest has certain multi-year contracts with fixed-price performance obligations that were unsatisfied (or partially unsatisfied) at the end of the reporting period, whereby revenue will be earned over time as MountainWest stands ready to provide service. These amounts are not material to the Company’s financial statements overall. MountainWest also has certain contract liabilities related to consideration received from customers with an obligation to transfer goods or services subsequent to the balance sheet date, amounts for which are generally consistent between December 31, 2021 and June 30, 2022 and are not material.

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Common Stock

6 Months Ended

Jun. 30, 2022

Equity [Abstract]

Common Stock

Note 4 – Common Stock

Shares of the Company’s common stock are publicly traded on the New York Stock Exchange, under the ticker symbol “SWX.” Share-based compensation related to Southwest and Centuri is based on stock awards to be issued in shares of Southwest Gas Holdings, Inc.

On April 8, 2021, the Company entered into a Sales Agency Agreement between the Company and BNY Mellon Capital Markets, LLC and J.P. Morgan Securities LLC (the “Equity Shelf Program”) for the offer and sale of up to $500 million of common stock from time to time in an at-the-market offering program. The shares are issued pursuant to the Company’s automatic shelf registration statement on Form S-3 (File No. 333-251074), or “the Universal Shelf.” There was no activity under the Equity Shelf Program during the quarter ended June 30, 2022. The following table provides the life-to-date activity under that program through June 30, 2022:

Gross proceeds	$	158,180,343
Less: agent commissions	(1,581,803)
Net proceeds	$	156,598,540
Number of shares sold	2,302,407
Weighted average price per share	$	68.70

As of June 30, 2022, the Company had approximately $341.8 million in common stock available for sale under the program.

In March 2022, the Company issued, through a separate prospectus supplement under the Universal Shelf, an aggregate of 6.325 million shares of common stock, in an underwritten public offering price of $74.00 per share, resulting in proceeds to the Company of $452.3 million, net of an underwriters’ discount of $15.8 million. The Company used the net proceeds to repay a portion of the outstanding borrowings under the 364-day term loan credit agreement that was used to initially fund the MountainWest acquisition.

During the six months ended June 30, 2022, the Company issued approximately 191,000 shares of common stock through the Restricted Stock/Unit Plan and Omnibus Incentive Plan.

Additionally, during the six months ended June 30, 2022, the Company issued 66,000 shares of common stock through the Dividend Reinvestment and Stock Purchase Plan, raising approximately $5.1 million.

In connection with the entry into the Cooperation Agreement (see Note 1 – Background, Organization, and Summary of Significant Accounting Policies), the Company entered into the Amended Rights Agreement to increase the beneficial ownership percentage included in the definition of “Acquiring Person” from 10% to 24.9% and to delete the concept of a “Passive Institutional Investor” to permit the Icahn Group to consummate the Offer.

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Debt

6 Months Ended

Jun. 30, 2022

Debt Disclosure [Abstract]

Debt

Note 5 – Debt

Long-Term Debt

Long-term debt is recognized in the Company’s and Southwest’s Condensed Consolidated Balance Sheets generally at the carrying value of the obligations outstanding. Details surrounding the fair value and individual carrying values of instruments are provided in the table that follows.

	June 30, 2022				December 31, 2021
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
(Thousands of dollars)
Southwest Gas Corporation:
Debentures:
Notes, 6.1%, due 2041	$	125,000	$	126,410	$	125,000	$	166,380
Notes, 4.05%, due 2032	600,000		549,396		—		—
Notes, 3.875%, due 2022	—		—		250,000		250,603
Notes, 4.875%, due 2043	250,000		230,653		250,000		307,538
Notes, 3.8%, due 2046	300,000		235,140		300,000		329,055
Notes, 3.7%, due 2028	300,000		283,260		300,000		325,191
Notes, 4.15%, due 2049	300,000		250,461		300,000		342,030
Notes, 2.2%, due 2030	450,000		365,054		450,000		440,838
Notes, 3.18%, due 2051	300,000		211,326		300,000		292,116
8% Series, due 2026	75,000		84,078		75,000		92,623
Medium-term notes, 7.78% series, due 2022	—		—		25,000		25,122
Medium-term notes, 7.92% series, due 2027	25,000		27,821		25,000		31,555
Medium-term notes, 6.76% series, due 2027	7,500		7,839		7,500		8,949
Unamortized discount and debt issuance costs	(26,627)				(19,959)
	2,705,873				2,387,541
Revolving credit facility and commercial paper	—		—		130,000		130,000
Industrial development revenue bonds:
Tax-exempt Series A, due 2028	50,000		50,000		50,000		50,000
2003 Series A, due 2038	50,000		50,000		50,000		50,000
2008 Series A, due 2038	50,000		50,000		50,000		50,000
2009 Series A, due 2039	50,000		50,000		50,000		50,000
Unamortized discount and debt issuance costs	(1,774)				(1,938)
	198,226				198,062
Less: current maturities	—				(275,000)
Southwest Gas Corporation total long-term debt, less current maturities	$	2,904,099			$	2,440,603
Southwest Gas Holdings, Inc.:
Centuri secured term loan facility	$	1,011,413	$	970,329	$	1,117,138	$	1,117,841
Centuri secured revolving credit facility	145,885		145,759		103,329		103,749
MountainWest unsecured senior notes, 3.53%, due in 2028	101,922		90,430		102,078		102,078
MountainWest unsecured senior notes, 4.875%, due in 2041	199,599		157,894		199,926		199,926
MountainWest unsecured senior notes, 3.91%, due in 2038	147,786		113,703		147,735		147,735
Other debt obligations	141,653		129,810		51,665		50,003
Unamortized discount and debt issuance costs	(22,627)				(24,466)
Less: current maturities	(41,276)				(22,324)
Southwest Gas Holdings, Inc. total long-term debt, less current maturities	$	4,588,454			$	4,115,684

Southwest has a $400 million credit facility that is scheduled to expire in April 2025. Southwest designates $150 million of associated capacity as long-term debt and the remaining $250 million for working capital purposes. Interest rates for the credit facility are calculated at either the Secured Overnight Financing Rate (“SOFR”) or an “alternate base rate,” plus in each case an applicable margin that is determined based on Southwest’s senior unsecured debt rating. At June 30, 2022, the applicable margin is 1.125% for loans bearing interest with reference to SOFR and 0.125% for loans bearing interest with reference to the alternative base rate. At June 30, 2022, no borrowings were outstanding on the long-term portion of the facility (including under the commercial paper program, discussed below), nor on the short-term portion of the facility.

Southwest has a $50 million commercial paper program. Issuances under the commercial paper program are supported by Southwest’s revolving credit facility and, therefore, do not represent additional borrowing capacity under the credit facility. Borrowings under the commercial paper program, if any, are designated as long-term debt. Interest rates for the program are calculated at the then current commercial paper rate. At June 30, 2022, as noted above, no borrowings were outstanding under the commercial paper program.

In March 2022, Southwest issued $600 million aggregate principal amount of 4.05% Senior Notes at a discount of 0.65%. The notes will mature in March 2032. Southwest used the net proceeds to redeem the $250 million 3.875% notes due in April 2022 and to repay outstanding amounts under its credit facility, with the remaining net proceeds used for general corporate purposes.

Centuri has a $1.545 billion secured revolving credit and term loan multi-currency facility. Amounts can be borrowed in either Canadian or U.S. dollars. The revolving credit facility matures on August 27, 2026 and the term loan facility matures on August 27, 2028. Interest rates for the revolving credit facility and term loan facility are based on either a “base rate” or LIBOR, plus an applicable margin in either case. The capacity of the line of credit portion of the facility is $400 million; related amounts borrowed and repaid are available to be re-borrowed. The term loan portion of the facility has a limit of $1.145 billion. The obligations under the credit agreement are secured by present and future ownership interests in substantially all direct and indirect subsidiaries of Centuri, substantially all of the tangible and intangible personal property of each borrower, certain of their direct and indirect subsidiaries, and all products, profits, and proceeds of the foregoing. Centuri’s assets securing the facility at June 30, 2022 totaled $2.5 billion. At June 30, 2022, $1.157 billion in borrowings were outstanding under Centuri’s combined secured revolving credit and term loan facility.

MountainWest has two private placement unsecured senior notes and a public unsecured senior note, with a combined carrying value of $449.3 million and aggregate principal amount of $430 million. The carrying value is higher than the principal balance as amounts outstanding were recorded at their fair values as of the December 31, 2021 acquisition date of the MountainWest entities.

Short-Term Debt

Southwest Gas Holdings, Inc. has a $200 million credit facility that is scheduled to expire in December 2026 and is primarily used for short-term financing needs. Interest rates for the credit facility are calculated at either SOFR or the “alternate base rate” plus in each case an applicable margin. There was $90 million outstanding under this credit facility as of June 30, 2022.

As indicated above, under Southwest’s $400 million credit facility, no short-term borrowings were outstanding at June 30, 2022.

In March 2022, Southwest amended its $250 million Term Loan (the “March 2021 Term Loan”), extending the maturity date to March 21, 2023 and replacing LIBOR interest rate benchmarks with SOFR interest rate benchmarks. The proceeds were originally used to fund the increased cost of natural gas supply during the month of February 2021, caused by extreme weather conditions in the central U.S. There was $225 million outstanding under the March 2021 Term Loan as of June 30, 2022.

In November 2021, Southwest Gas Holdings, Inc. entered into a 364-day term loan credit agreement (the “Credit Agreement”). The Credit Agreement provided for a $1.6 billion delayed-draw term loan (the “Term Loan Facility”) to primarily fund the acquisition of the equity interests in MountainWest (refer to Note 8 - Business Acquisitions). The Term Loan Facility was funded on December 31, 2021, and matures on December 30, 2022. There was $1.15 billion outstanding under the Term Loan Facility as of June 30, 2022.

The borrowings under the Term Loan Facility created a negative working capital condition for the Company, which as of June 30, 2022 is approximately $707 million. As of August 9, 2022, the Company does not have sufficient liquidity or capital resources to repay the Term Loan Facility without issuing new debt or equity. As disclosed in Note 1 – Background, Organization, and Summary of Significant Accounting Policies, the Company is exploring strategic alternatives, including a potential sale of MountainWest. Management intends to either issue long-term debt to refinance the Term Loan Facility or extend the Term Loan Facility up to 364 days. If MountainWest is sold as part of the Strategic Review process, the proceeds will be used to repay the amounts borrowed to fund the acquisition.

Management believes that its refinancing plan is probable based on the Company’s ability to generate consistent cash flows, its current credit ratings, its relationships with its lenders and its prior history of successfully raising debt and equity necessary to fund its acquisitions and operations. As such, management has concluded that the Company can satisfy its obligations for at least the next twelve months from the issuance date of these financial statements.

The Company’s ability to access capital markets or to otherwise obtain sufficient financing may be affected by future conditions. If the Company is unable to execute its plan to refinance debt obligations, the Company’s credit facility could be terminated, and amounts due under its revolver and other borrowing arrangements could be declared immediately due and payable.

LIBOR

Certain rates established at LIBOR are scheduled to be discontinued as a benchmark or reference rate after 2021, while other LIBOR-based rates are scheduled to be discontinued after June 2023. As of June 30, 2022, the Company had $2.16 billion in aggregate outstanding borrowings under Centuri’s combined facility and Southwest Gas Holdings, Inc.’s Term Loan Facility. Southwest had no outstanding borrowings or variable rate debt agreements with reference to LIBOR as of June 30, 2022. In order to mitigate the impact on the financial condition and results of operations of the Company, management will monitor developments and work with lenders to determine the appropriate replacement/alternative reference rate for variable rate debt. At this time the Company can provide no assurances as to the impact a LIBOR discontinuance will have on its financial condition or results of operations. Any alternative rate may be less predictable or less attractive than LIBOR.

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Other Comprehensive Income and Accumulated Other Comprehensive Income

6 Months Ended

Jun. 30, 2022

Equity [Abstract]

Other Comprehensive Income and Accumulated Other Comprehensive Income

Note 6 – Other Comprehensive Income and Accumulated Other Comprehensive Income

The following information presents the Company’s Other comprehensive income (loss), both before and after-tax impacts, within the Condensed Consolidated Statements of Comprehensive Income, which also impact Accumulated other comprehensive income (“AOCI”) in the Condensed Consolidated Balance Sheets and the Condensed Consolidated Statements of Equity.

Related Tax Effects Allocated to Each Component of Other Comprehensive Income (Loss)

	Three Months Ended June 30, 2022						Three Months Ended June 30, 2021
(Thousands of dollars)	Before- Tax Amount		Tax (Expense) or Benefit (1)		Net-of- Tax Amount		Before- Tax Amount		Tax (Expense) or Benefit (1)		Net-of- Tax Amount
Defined benefit pension plans:
Amortization of prior service cost	$	44	$	(11)	$	33	$	240	$	(58)	$	182
Amortization of net actuarial (gain)/loss	8,704		(2,089)		6,615		11,148		(2,676)		8,472
Regulatory adjustment	(7,268)		1,744		(5,524)		(9,575)		2,298		(7,277)
Pension plans other comprehensive income (loss)	1,480		(356)		1,124		1,813		(436)		1,377
FSIRS (designated hedging activities):
Amounts reclassified into net income	—		—		—		544		(130)		414
FSIRS other comprehensive income (loss)	—		—		—		544		(130)		414
Total other comprehensive income (loss) - Southwest Gas Corporation	1,480		(356)		1,124		2,357		(566)		1,791
Foreign currency translation adjustments:
Translation adjustments	(2,680)		—		(2,680)		909		—		909
Foreign currency other comprehensive income (loss)	(2,680)		—		(2,680)		909		—		909
Total other comprehensive income (loss) - Southwest Gas Holdings, Inc.	$	(1,200)	$	(356)	$	(1,556)	$	3,266	$	(566)	$	2,700
	Six Months Ended June 30, 2022						Six Months Ended June 30, 2021
(Thousands of dollars)	Before- Tax Amount		Tax (Expense) or Benefit (1)		Net-of- Tax Amount		Before- Tax Amount		Tax (Expense) or Benefit (1)		Net-of- Tax Amount
Defined benefit pension plans:
Amortization of prior service cost	$	88	$	(22)	$	66	$	480	$	(116)	$	364
Amortization of net actuarial (gain)/loss	17,409		(4,178)		13,231		22,297		(5,351)		16,946
Regulatory adjustment	(14,536)		3,489		(11,047)		(19,150)		4,596		(14,554)
Pension plans other comprehensive income (loss)	2,961		(711)		2,250		3,627		(871)		2,756
FSIRS (designated hedging activities):
Amounts reclassified into net income	545		(129)		416		1,088		(261)		827
FSIRS other comprehensive income (loss)	545		(129)		416		1,088		(261)		827
Total other comprehensive income (loss) - Southwest Gas Corporation	3,506		(840)		2,666		4,715		(1,132)		3,583
Foreign currency translation adjustments:
Translation adjustments	(1,433)		—		(1,433)		1,732		—		1,732
Foreign currency other comprehensive income (loss)	(1,433)		—		(1,433)		1,732		—		1,732
Total other comprehensive income (loss) - Southwest Gas Holdings, Inc.	$	2,073	$	(840)	$	1,233	$	6,447	$	(1,132)	$	5,315

	Twelve Months Ended June 30, 2022						Twelve Months Ended June 30, 2021
(Thousands of dollars)	Before- Tax Amount		Tax (Expense) or Benefit (1)		Net-of- Tax Amount		Before- Tax Amount		Tax (Expense) or Benefit (1)		Net-of- Tax Amount
Defined benefit pension plans:
Net actuarial gain/(loss)	$	59,176	$	(14,202)	$	44,974	$	(57,539)	$	13,809	$	(43,730)
Amortization of prior service cost	567		(136)		431		1,057		(255)		802
Amortization of net actuarial (gain)/loss	39,709		(9,530)		30,179		41,212		(9,890)		31,322
Regulatory adjustment	(83,580)		20,060		(63,520)		5,075		(1,219)		3,856
Pension plans other comprehensive income (loss)	15,872		(3,808)		12,064		(10,195)		2,445		(7,750)
FSIRS (designated hedging activities):
Amounts reclassified into net income	1,631		(390)		1,241		2,662		(639)		2,023
FSIRS other comprehensive income (loss)	1,631		(390)		1,241		2,662		(639)		2,023
Total other comprehensive income (loss) - Southwest Gas Corporation	17,503		(4,198)		13,305		(7,533)		1,806		(5,727)
Foreign currency translation adjustments:
Translation adjustments	(3,145)		—		(3,145)		5,656		—		5,656
Foreign currency other comprehensive income (loss)	(3,145)		—		(3,145)		5,656		—		5,656
Total other comprehensive income (loss) - Southwest Gas Holdings, Inc.	$	14,358	$	(4,198)	$	10,160	$	(1,877)	$	1,806	$	(71)

(1)Tax amounts are calculated using a 24% rate. The Company has elected to indefinitely reinvest, in Canada, the earnings of Centuri’s Canadian subsidiaries, thus precluding deferred taxes on such earnings. As a result of this assertion, and no repatriation of earnings anticipated, the Company is not recognizing a tax effect or presenting a tax expense or benefit for currency translation adjustments reported in Other comprehensive income (loss).

The following table represents a rollforward of AOCI, presented on the Company’s Condensed Consolidated Balance Sheets and its Condensed Consolidated Statements of Equity:

	Defined Benefit Plans						FSIRS						Foreign Currency Items
(Thousands of dollars)	Before-Tax		Tax (Expense) Benefit (4)		After-Tax		Before-Tax		Tax (Expense) Benefit (4)		After-Tax		Before-Tax		Tax (Expense) Benefit		After-Tax		AOCI
Beginning Balance AOCI December 31, 2021	$	(61,182)	$	14,685	$	(46,497)	$	(545)	$	129	$	(416)	$	152	$	—	$	152	$	(46,761)
Translation adjustments	—		—		—		—		—		—		(1,433)		—		(1,433)		(1,433)
Other comprehensive income (loss) before reclassifications	—		—		—		—		—		—		(1,433)		—		(1,433)		(1,433)
FSIRS amount reclassified from AOCI (1)	—		—		—		545		(129)		416		—		—		—		416
Amortization of prior service cost (2)	88		(22)		66		—		—		—		—		—		—		66
Amortization of net actuarial loss (2)	17,409		(4,178)		13,231		—		—		—		—		—		—		13,231
Regulatory adjustment (3)	(14,536)		3,489		(11,047)		—		—		—		—		—		—		(11,047)
Net current period other comprehensive income (loss) attributable to Southwest Gas Holdings, Inc.	2,961		(711)		2,250		545		(129)		416		(1,433)		—		(1,433)		1,233
Ending Balance AOCI June 30, 2022	$	(58,221)	$	13,974	$	(44,247)	$	—	$	—	$	—	$	(1,281)	$	—	$	(1,281)	$	(45,528)

(1)The FSIRS reclassification amount is included in Net interest deductions on the Company’s Condensed Consolidated Statements of Income.

(2)These AOCI components are included in the computation of net periodic benefit cost (see Note 2 – Components of Net Periodic Benefit Cost for additional details).

(3)The regulatory adjustment represents the portion of the activity above that is expected to be recovered through rates in the future (the related regulatory asset is included in Deferred charges and other assets on the Company’s Condensed Consolidated Balance Sheets).

(4)Tax amounts are calculated using a 24% rate.

The following table represents a rollforward of AOCI, presented on Southwest’s Condensed Consolidated Balance Sheets:

	Defined Benefit Plans						FSIRS
(Thousands of dollars)	Before-Tax		Tax (Expense) Benefit (8)		After-Tax		Before-Tax		Tax (Expense) Benefit (8)		After-Tax		AOCI
Beginning Balance AOCI December 31, 2021	$	(61,182)	$	14,685	$	(46,497)	$	(545)	$	129	$	(416)	$	(46,913)
FSIRS amount reclassified from AOCI (5)	—		—		—		545		(129)		416		416
Amortization of prior service cost (6)	88		(22)		66		—		—		—		66
Amortization of net actuarial loss (6)	17,409		(4,178)		13,231		—		—		—		13,231
Regulatory adjustment (7)	(14,536)		3,489		(11,047)		—		—		—		(11,047)
Net current period other comprehensive income attributable to Southwest Gas Corporation	2,961		(711)		2,250		545		(129)		416		2,666
Ending Balance AOCI June 30, 2022	$	(58,221)	$	13,974	$	(44,247)	$	—	$	—	$	—	$	(44,247)

(5)    The FSIRS reclassification amount is included in Net interest deductions on Southwest’s Condensed Consolidated Statements of Income.

(6)These AOCI components are included in the computation of net periodic benefit cost (see Note 2 – Components of Net Periodic Benefit Cost for additional details).

(7)The regulatory adjustment represents the portion of the activity above that is expected to be recovered through rates in the future (the related regulatory asset is included in Deferred charges and other assets on Southwest’s Condensed Consolidated Balance Sheets).

(8)Tax amounts are calculated using a 24% rate.

The following table represents amounts (before income tax impacts) included in AOCI (in the tables above), that have not yet been recognized in net periodic benefit cost:

(Thousands of dollars)	June 30, 2022		December 31, 2021
Net actuarial loss	$	(381,601)	$	(399,010)
Prior service cost	(1,440)		(1,528)
Less: amount recognized in regulatory assets	324,820		339,356
Recognized in AOCI	$	(58,221)	$	(61,182)

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Segment Information

6 Months Ended

Jun. 30, 2022

Segment Reporting [Abstract]

Segment Information

Note 7 – Segment Information

As a result of the MountainWest acquisition on December 31, 2021, management updated its segment reporting from the historical presentation of two reportable segments to three reportable segments, with MountainWest presented as the pipeline and storage segment. Southwest comprises the natural gas distribution segment and Centuri comprises the utility infrastructure services segment.

Centuri accounts for the services provided to Southwest at contractual prices. Accounts receivable for these services, which are not eliminated during consolidation, are presented in the table below:

(Thousands of dollars)	June 30, 2022		December 31, 2021
Centuri accounts receivable for services provided to Southwest	$	16,915	$	15,166

In order to reconcile (below) to net income as disclosed in the Condensed Consolidated Statements of Income, an Other column is included associated with impacts of corporate and administrative activities related to Southwest Gas Holdings, Inc. The financial information pertaining to the natural gas distribution, utility infrastructure services, and pipeline and storage segments are as follows:

(Thousands of dollars)	Natural Gas Distribution		Utility Infrastructure Services		Pipeline and Storage		Other		Total
Three Months Ended June 30, 2022
Revenues from external customers	$	377,942	$	672,119	$	62,088	$	—	$	1,112,149
Intersegment revenues	—		33,971		—		—		33,971
Total	$	377,942	$	706,090	$	62,088	$	—	$	1,146,120
Segment net income (loss)	$	(2,266)	$	4,741	$	15,076	$	(24,126)	$	(6,575)
Three Months Ended June 30, 2021
Revenues from external customers	$	292,796	$	504,941	$	—	$	—	$	797,737
Intersegment revenues	—		23,684		—		—		23,684
Total	$	292,796	$	528,625	$	—	$	—	$	821,421
Segment net income (loss)	$	11,413	$	15,116	$	—	$	(1,410)	$	25,119
(Thousands of dollars)	Natural Gas Operations		Utility Infrastructure Services		Pipeline and Storage		Other		Total
Six Months Ended June 30, 2022
Revenues from external customers	$	1,054,481	$	1,167,663	$	129,081	$	—	$	2,351,225
Intersegment revenues	—		62,304		—		—		62,304
Total	$	1,054,481	$	1,229,967	$	129,081	$	—	$	2,413,529
Segment net income (loss)	$	109,529	$	(18,745)	$	32,006	$	(33,187)	$	89,603
Six Months Ended June 30, 2021
Revenues from external customers	$	814,728	$	844,713	$	—	$	—	$	1,659,441
Intersegment revenues	—		47,887		—		—		47,887
Total	$	814,728	$	892,600	$	—	$	—	$	1,707,328
Segment net income (loss)	$	130,128	$	14,257	$	—	$	(1,973)	$	142,412

(Thousands of dollars)	Natural Gas Distribution		Utility Infrastructure Services		Pipeline and Storage		Other		Total
Twelve Months Ended June 30, 2022
Revenues from external customers	$	1,761,543	$	2,379,265	$	129,081	$	—	$	4,269,889
Intersegment revenues	—		116,763		—		—		116,763
Total	$	1,761,543	$	2,496,028	$	129,081	$	—	$	4,386,652
Segment net income (loss)	$	166,536	$	7,418	$	32,006	$	(57,990)	$	147,970
Twelve Months Ended June 30, 2021
Revenues from external customers	$	1,400,052	$	1,899,961	$	—	$	—	$	3,300,013
Intersegment revenues	—		112,621		—		—		112,621
Total	$	1,400,052	$	2,012,582	$	—	$	—	$	3,412,634
Segment net income (loss)	$	193,705	$	73,056	$	—	$	(2,532)	$	264,229

The corporate and administrative activities for Southwest Gas Holdings, Inc. in the three-, six-, and twelve-month periods ended June 30, 2022 include expenses incurred related to shareholder activism and related settlement activities, expenses incurred in conducting the Strategic Review, and expenses and financing costs for the MountainWest acquisition.

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Business Acquisitions

6 Months Ended

Jun. 30, 2022

Business Combination and Asset Acquisition [Abstract]

Business Acquisitions

Note 8 - Business Acquisitions

In August 2021, the Company, through its subsidiaries, led principally by Centuri, completed the acquisition of Drum, including its primary subsidiary, Riggs Distler. In November 2021, certain members of Riggs Distler management acquired a 1.42% interest in Drum. See the Company’s 2021 Form 10-K for additional information about this acquisition.

Assets acquired and liabilities assumed in the transaction were recorded at their acquisition date fair values. Transaction costs associated with the acquisition were expensed as incurred. The Company’s allocation of the purchase price was based on an evaluation of the appropriate fair values and represented management’s best estimate based on available data (including market data, data regarding customers of the acquired businesses, terms of acquisition-related agreements, analysis of historical and projected results, and other types of data). The analysis included consideration of types of intangibles that were acquired, including customer relationships, trade name, and backlog. Certain payments were estimated as of the acquisition date and were adjusted when amounts were finalized. Further adjustments may still occur. Due to the estimations made, the final purchase accounting has not yet been completed and further refinements may occur, including potential changes to income taxes.

The preliminary estimated fair values of assets acquired and liabilities assumed as of August 27, 2021, and as updated through June 30, 2022, are as follows:

(Millions of dollars)	Acquisition Date		Measurement Period Adjustments		Revised Acquisition Date
Cash and cash equivalents	$	1.9	$	—	$	1.9
Accounts receivable	69.1		(8.6)		60.5
Contract assets	40.1		7.4		47.5
Income taxes receivable, net	0.7		—		0.7
Right of use assets under operating leases	1.5		—		1.5
Prepaid expenses	5.2		—		5.2
Property and equipment	118.1		1.2		119.3
Intangible assets	335.0		(31.5)		303.5
Goodwill	446.8		1.8		448.6
Total assets acquired	1,018.4		$	(29.7)	$	988.7
Trade and other payables	46.2		—		46.2
Finance lease obligations	27.5		1.2		28.7
Contract liabilities	12.7		—		12.7
Operating lease obligations	1.5		—		1.5
Other liabilities	5.3		(1.2)		4.1
Deferred tax liabilities	94.8		(23.4)		71.4
Total liabilities assumed and noncontrolling interest	188.0		(23.4)		164.6
Net assets acquired	$	830.4	$	(6.3)	$	824.1

The Company incurred and expensed acquisition costs of $14 million, included in Utility infrastructure services expenses in the Company’s Condensed Consolidated Statement of Income for the twelve months ended June 30, 2022. No acquisition-related costs were incurred during the three and six months ended June 30, 2022, and no significant impacts to earnings resulted from the measurement-period adjustments reflected above.

In December 2021 Southwest Gas Holdings, Inc. completed the acquisition of Dominion Energy Questar Pipeline, LLC and related entities (subsequently rebranded as “MountainWest”), which resulted in MountainWest becoming a wholly owned subsidiary of the Company. See the Company’s 2021 Form 10-K for additional information about this acquisition.

Assets acquired and liabilities assumed in the transaction were recorded at their acquisition date fair values. Transaction costs associated with the acquisition were expensed as incurred. The majority of the operations acquired are subject to FERC rate-regulation and therefore are accounted for pursuant to ASC 980, Regulated Operations. The fair values of MountainWest’s

assets and liabilities, subject to rate making and cost recovery provisions, provide revenues derived from costs of service, including a return on investment of assets and liabilities included in rate base. Accordingly, the carrying values of such assets and liabilities were deemed to approximate their fair values. The fair value of the MountainWest assets and liabilities assumed that are not subject to the rate-regulation provisions discussed above include a 50% equity method investment, non-regulated property, plant and equipment, and long-term debt assumed; related fair values were determined using a market approach, income approach, or cost approach, as appropriate. Amounts related to post-closing payments and deferred taxes were estimated as of the acquisition date and adjusted when determined during the period ended June 30, 2022. No other measurement period adjustments occurred during the period. However, the final purchase accounting has not yet been completed and further refinements may occur, including finalization of income tax-related amounts.

The preliminary estimated fair values of assets acquired and liabilities assumed as of December 31, 2021, and as updated through June 30, 2022, are as follows:

(Millions of dollars)	Acquisition Date		Measurement Period Adjustments		Revised Acquisition Date
Gas plant, net	$	1,047.4	$	—	$	1,047.4
Other property and investments	51.3		—		51.3
Cash and cash equivalents	17.6		—		17.6
Accounts receivable, net of allowances	26.6		2.9		29.5
Prepaid and other current assets	27.4		—		27.4
Deferred charges and other assets	31.1		—		31.1
Goodwill	986.2		(28.2)		958.0
Deferred income taxes, net	15.4		20.9		36.3
Total assets acquired	2,203.0		(4.4)		2,198.6
Long-term debt	449.7		—		449.7
Accounts payable	7.0		—		7.0
Deferred purchased gas costs	5.7		—		5.7
Customer deposits	3.2		—		3.2
Accrued general taxes	0.4		—		0.4
Accrued interest	4.7		—		4.7
Other current liabilities	14.5		—		14.5
Accumulated removal costs	56.6		—		56.6
Other deferred credits	85.6		—		85.6
Total liabilities assumed	627.4		—		627.4
Net assets acquired	$	1,575.6	$	(4.4)	$	1,571.2

The Company incurred and expensed acquisition costs of $18.5 million for the twelve months ended June 30, 2022, which are included in Operations and maintenance expense on the Company’s Condensed Consolidated Statement of Income. No acquisition-related costs were incurred during the six months ended June 30, 2022 and no impacts to earnings resulted from the measurement-period adjustments reflected above. The Company has a transition services agreement with the sellers for a period of up to twelve months from the acquisition date of December 31, 2021, to continue certain corporate and administrative functions for the entities acquired while MountainWest is established as an independent enterprise.

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Background, Organization, and Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Nature of Operations

Nature of Operations. Southwest Gas Holdings, Inc. (together with its subsidiaries, the “Company”) is a holding company, owning all of the shares of common stock of Southwest Gas Corporation (“Southwest” or the “natural gas distribution” segment), all of the shares of common stock of Centuri Group, Inc. (“Centuri,” or the “utility infrastructure services” segment), and all of the shares of common stock of MountainWest Pipelines Holding Company (“MountainWest,” or the “pipeline and storage” segment).

The Company completed the acquisition of Dominion Energy Questar Pipeline, LLC and related entities (“Questar Pipelines”) in December 2021. Following the completion of the acquisition, the Company formed MountainWest which owns all of the membership interests in Questar Pipelines. In April 2022, the Company completed a general rebranding of the Questar Pipelines entities under the MountainWest name. The acquired operations further diversify the Company’s business in the midstream sector, with an expansion of interstate natural gas pipelines and underground storage services, primarily composed of regulated operations under the jurisdiction of the Federal Energy Regulatory Commission (the “FERC”), thereby expanding natural gas transportation services into Utah, Wyoming, and Colorado. See Note 8 - Business Acquisitions for more information.

Southwest is engaged in the business of purchasing, distributing, and transporting natural gas for customers in portions of Arizona, Nevada, and California. Public utility rates, practices, facilities, and service territories of Southwest are subject to regulatory oversight. The timing and amount of rate relief can materially impact results of operations. Natural gas purchases and the timing of related recoveries can materially impact liquidity. Results for the natural gas distribution segment are higher during winter periods due to the seasonality incorporated in its regulatory rate structures.

Centuri is a strategic utility infrastructure services company dedicated to partnering with North America’s gas and electric providers to build and maintain the energy network that powers millions of homes across the United States (“U.S.”) and Canada. Centuri derives revenue primarily from installation, replacement, repair, and maintenance of energy networks. Centuri operates in the U.S., primarily as NPL, Neuco, Linetec, and Riggs Distler, and in Canada, primarily as NPL Canada. Utility infrastructure services activity is seasonal in many of Centuri’s operating areas. Peak periods are the summer and fall months in colder climate areas, such as the northeastern and midwestern U.S. and in Canada. In warmer climate areas, such as the southwestern and southeastern U.S., utility infrastructure services activity continues year round.

Basis of Presentation

Basis of Presentation. The condensed consolidated financial statements of Southwest Gas Holdings, Inc. and subsidiaries and Southwest included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). The year-end 2021 condensed balance sheet data was derived from audited financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) have been condensed or omitted pursuant to such rules and regulations. No substantive change has occurred with regard to the Company’s business segments on the whole during the recently completed quarter.

The preparation of the condensed consolidated financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. In the opinion of management, all adjustments, consisting of normal recurring items and estimates necessary for a fair depiction of results for the interim periods, have been made.

These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the 2021 Annual Report to Stockholders, which is incorporated by reference into the 2021 Form 10-K.

Cash and Cash Equivalents

Cash and Cash Equivalents.  Cash and cash equivalents include money market fund investments totaling approximately $77 million and $97 million, for Southwest and the Company, respectively, at June 30, 2022, and $20 million for the Company as of December 31, 2021. The balance for Southwest as of December 31, 2021 was insignificant. These investments fall within Level 2 of the fair value hierarchy, due to the asset valuation methods used by money market funds. Non-cash investing activities for the Company and Southwest include capital expenditures that were not yet paid, thereby remaining in accounts payable, which declined by approximately $11.6 million and $18.3 million, respectively, during the six months ended June 30, 2022, and increased $6.5 million and $6.6 million, respectively, during the twelve months ended June 30, 2022.

Accounts Receivable, net of allowances

Accounts Receivable, net of allowances. Following an earlier moratorium on account disconnections amidst the COVID-19 environment, account collection efforts resumed in 2021 in all jurisdictions in which Southwest operates. Ultimately, some accounts may not be collected, and if so, would be written off. Estimates as to collectibility are made on an ongoing basis. However, Southwest continues to actively work with customers experiencing financial hardship by means of flexible payment options and partnering with assistance agencies. The cost of gas included in customer rates also influences account balances at each reporting date.

Deferred Purchased Gas Costs

Deferred Purchased Gas Costs. The various regulatory commissions have established procedures to enable the rate-regulated companies to adjust billing rates for changes in the cost of natural gas purchased. The difference between the current cost of gas purchased and the cost of gas recovered in billed rates is deferred. Generally, these deferred amounts are recovered or refunded within one year.

Prepaid and other current assets

Prepaid and other current assets. Prepaid and other current assets for Southwest include, among other things, materials and operating supplies of $70.2 million at June 30, 2022 and $62.9 million at December 31, 2021 (carried at weighted average cost). For the Company, there were materials and operating supplies of $74.5 million and $67.4 million at June 30, 2022 and December 31, 2021, respectively, which included amounts for MountainWest. Also included in the balance for both Southwest and the Company was $10.2 million and $52 million as of June 30, 2022 and December 31, 2021, respectively, in accrued purchased gas cost.

Goodwill

Goodwill. Goodwill is assessed as of October 1st each year for impairment, or more frequently, if circumstances indicate an impairment to the carrying value of goodwill may have occurred. Management of the Company and Southwest considered its reporting units and segments, determining that they remained consistent between periods presented below, and that no change was necessary with regard to the level at which goodwill is assessed for impairment. The acquisition of MountainWest resulted in a new reportable segment which is assessed for impairment beginning in 2022.

Other Current Liabilities

Other Current Liabilities. Management recognizes in its balance sheets various liabilities that are expected to be settled through future cash payment within the next twelve months, including amounts payable under regulatory mechanisms, customary accrued expenses for employee compensation and benefits, declared but unpaid dividends, and miscellaneous other accrued liabilities. Other current liabilities for the Company include $41.5 million and $36 million of dividends declared as of June 30, 2022 and December 31, 2021, respectively.

Earnings Per Share

Earnings Per Share. Basic earnings per share (“EPS”) in each period of this report were calculated by dividing net income attributable to Southwest Gas Holdings, Inc. by the weighted-average number of shares during those periods. Diluted EPS includes additional weighted-average common stock equivalents (performance shares and restricted stock units). Unless otherwise noted, the term “Earnings Per Share” refers to Basic EPS.

Recent Accounting Standards Updates

Recent Accounting Standards Updates.

Accounting pronouncements effective or adopted in 2022:

In March 2020, the Financial Accounting Standards Board (the “FASB”) issued ASU 2020-04 “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” The update provides optional guidance for a limited time to ease the potential burden in accounting for, or recognizing the effects of, reference rate reform on financial reporting, including when modifying a contract (during the eligibility period covered by the update to Topic 848) to replace a reference rate affected by such reform. The update applies only to contracts and hedging relationships that reference the London Interbank Offered Rate (“LIBOR”) or another rate expected to be discontinued due to reference rate reform. The guidance was eligible to be applied upon issuance on March 12, 2020, and can generally be applied through December 31, 2022, and while a proposal by the FASB has occurred to extend the optional guidance to the full tenor of LIBOR expiration dates occurring after 2022, to date, no such update has been made effective. Management will monitor the impacts this update might have on the Company’s and Southwest’s consolidated financial statements and disclosures, and will reflect such appropriately, in the event that the optional guidance is elected. Management will also monitor further FASB action, if any, in regard to the full tenor of LIBOR expiration dates.In August 2020, the FASB issued ASU 2020-06 “Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging— Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity.” The update, amongst other amendments, improves the guidance related to the disclosures and earnings-per-share for convertible instruments and contracts in an entity’s own equity. The Company and Southwest adopted the update in the first quarter of 2022, the impact of which was not material to the consolidated financial statements of the Company or Southwest.

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Background, Organization, and Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Other Property and Investments

Other property and investments on Southwest’s and the Company’s Condensed Consolidated Balance Sheets includes:

(Thousands of dollars)	June 30, 2022		December 31, 2021
Net cash surrender value of COLI policies	$	142,819	$	149,947
Other property	3,780		3,146
Total Southwest Gas Corporation	146,599		153,093
Non-regulated property, equipment, and intangibles	1,678,683		1,616,392
Non-regulated accumulated provision for depreciation and amortization	(569,630)		(512,343)
Other property and investments	57,049		59,337
Total Southwest Gas Holdings, Inc.	$	1,312,701	$	1,316,479

Schedule of Goodwill

Goodwill in the Natural Gas Distribution operations of Southwest, and across all operations of the Company, is included in their respective Condensed Consolidated Balance Sheets as follows:

(Thousands of dollars)	Natural Gas Distribution		Utility Infrastructure Services		Pipeline and Storage		Total Company
December 31, 2021	$	10,095	$	785,058	$	986,179	$	1,781,332
Measurement-period adjustments from Riggs Distler acquisition (a)	—		(906)				(906)
Measurement-period adjustments from MountainWest acquisition (a)	—		—		(28,178)		(28,178)
Foreign currency translation adjustment	—		(1,776)		—		(1,776)
June 30, 2022	$	10,095	$	782,376	$	958,001	$	1,750,472

(a) See Note 8 - Business Acquisitions for details regarding measurement-period adjustments.

Schedule of Significant Items Included in Other Income (Deductions)

The following table provides the composition of significant items included in Other income (deductions) in Southwest’s and the Company’s Condensed Consolidated Statements of Income:

	Three Months Ended June 30,				Six Months Ended June 30,				Twelve Months Ended June 30,
(Thousands of dollars)	2022		2021		2022		2021		2022		2021
Southwest Gas Corporation:
Change in COLI policies	$	(5,200)	$	3,100	$	(7,200)	$	5,800	$	(4,200)	$	18,500
Interest income	3,198		1,231		5,999		1,947		9,165		4,160
Equity AFUDC	81		(981)		157		—		157		2,543
Other components of net periodic benefit cost	(187)		(3,505)		(375)		(7,010)		(7,386)		(17,021)
Miscellaneous income and (expense)	(1,325)		(1,010)		(699)		(1,352)		(3,798)		(2,689)
Southwest Gas Corporation - total other income (deductions)	(3,433)		(1,165)		(2,118)		(615)		(6,062)		5,493
Centuri, MountainWest, and Southwest Gas Holdings, Inc.:
Foreign transaction gain (loss)	214		(9)		217		(12)		207		(12)
Equity AFUDC	236		—		418		—		418		—
Equity in earnings of unconsolidated investments	728		109		1,243		101		1,368		156
Miscellaneous income and (expense)	(580)		(246)		(1,351)		(337)		(158)		(444)
Southwest Gas Holdings, Inc. - total other income (deductions)	$	(2,835)	$	(1,311)	$	(1,591)	$	(863)	$	(4,227)	$	5,193

Summary of Redeemable Noncontrolling Interest

The following depicts changes to the balances of the redeemable noncontrolling interests:

(Thousands of dollars):	Linetec		Drum		Total
Balance, December 31, 2021	$	184,148	$	12,569	$	196,717
Net income (loss) attributable to redeemable noncontrolling interests	1,576		(10)		1,566
Redemption value adjustments	(35,978)		—		(35,978)
Redemption of equity interest from noncontrolling party	(39,649)		—		(39,649)
Balance, June 30, 2022	$	110,097	$	12,559	$	122,656

Schedule of Earnings Per Share, Basic and Diluted

A reconciliation of the denominator used in Basic and Diluted EPS calculations is shown in the following table:

	Three Months Ended June 30,		Six Months Ended June 30,		Twelve Months Ended June 30,
(In thousands)	2022	2021	2022	2021	2022	2021
Weighted average basic shares	67,045	58,607	63,909	58,106	62,022	57,348
Effect of dilutive securities:
Restricted stock units (1)	145	103	132	91	135	92
Weighted average diluted shares	67,190	58,710	64,041	58,197	62,157	57,440

(1) The number of securities included 136,000 and 95,000 performance shares during the three months ending June 30, 2022 and 2021, 125,000 and 85,000 performance shares during the six months ending June 30, 2022 and 2021 and 124,000 and 83,000 performance shares during the twelve months ending June 30, 2022 and 2021, respectively, the total of which was derived by assuming that target performance will be achieved during the relevant performance period.

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Components of Net Periodic Benefit Cost (Tables)

6 Months Ended

Jun. 30, 2022

Retirement Benefits [Abstract]

Schedule of Net Periodic Benefit Costs

The service cost component of net periodic benefit costs included in the table below is a component of an overhead loading process associated with the cost of labor. The overhead process ultimately results in allocation of service cost to the same accounts to which productive labor is charged. As a result, service costs become components of various accounts, primarily operations and maintenance expense, net regulated operations plant, and deferred charges and other assets for both the Company and Southwest. The other components of net periodic benefit cost are reflected in Other income (deductions) on the Condensed Consolidated Statements of Income of each entity.

	Qualified Retirement Plan
	June 30,
	Three Months				Six Months				Twelve Months
	2022		2021		2022		2021		2022		2021
(Thousands of dollars)
Service cost	$	11,028	$	10,290	$	22,056	$	20,580	$	42,635	$	37,730
Interest cost	11,251		10,108		22,502		20,216		42,718		42,994
Expected return on plan assets	(19,978)		(18,088)		(39,956)		(36,176)		(76,132)		(68,824)
Amortization of net actuarial loss	8,117		10,489		16,234		20,978		37,211		38,990
Net periodic benefit cost	$	10,418	$	12,799	$	20,836	$	25,598	$	46,432	$	50,890
	SERP
	June 30,
	Three Months				Six Months				Twelve Months
	2022		2021		2022		2021		2022		2021
(Thousands of dollars)
Service cost	$	106	$	132	$	212	$	263	$	475	$	457
Interest cost	360		358		720		716		1,435		1,517
Amortization of net actuarial loss	587		660		1,175		1,320		2,497		2,223
Net periodic benefit cost	$	1,053	$	1,150	$	2,107	$	2,299	$	4,407	$	4,197
	PBOP
	June 30,
	Three Months				Six Months				Twelve Months
	2022		2021		2022		2021		2022		2021
(Thousands of dollars)
Service cost	$	485	$	423	$	970	$	846	$	1,815	$	1,636
Interest cost	613		548		1,226		1,096		2,323		2,388
Expected return on plan assets	(807)		(810)		(1,614)		(1,620)		(3,233)		(3,324)
Amortization of prior service costs	44		240		88		480		567		1,057
Net periodic benefit cost	$	335	$	401	$	670	$	802	$	1,472	$	1,757

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Revenue (Tables)

6 Months Ended

Jun. 30, 2022

Revenue from Contract with Customer [Abstract]

Summary of Revenue Disaggregated by Service Type and Contract Type

Southwest’s operating revenues included on the Condensed Consolidated Statements of Income of both the Company and Southwest include revenue from contracts with customers, which is shown below, disaggregated by customer type, in addition to other categories of revenue:

	Three Months Ended June 30,				Six Months Ended June 30,				Twelve Months Ended June 30,
(Thousands of dollars)	2022		2021		2022		2021		2022		2021
Residential	$	228,573	$	193,322	$	743,159	$	596,465	$	1,182,306	$	995,132
Small commercial	78,730		56,093		202,714		137,491		335,437		235,114
Large commercial	20,989		13,158		41,150		25,831		72,690		47,818
Industrial/other	10,773		6,974		20,745		20,744		42,314		33,785
Transportation	24,466		21,797		51,098		46,333		97,005		90,307
Revenue from contracts with customers	363,531		291,344		1,058,866		826,864		1,729,752		1,402,156
Alternative revenue program revenues (deferrals)	11,022		(1,531)		(12,477)		(17,904)		18,608		(6,110)
Other revenues (1)	3,389		2,983		8,092		5,768		13,183		4,006
Total Regulated operations revenues	$	377,942	$	292,796	$	1,054,481	$	814,728	$	1,761,543	$	1,400,052

(1) Amounts include late fees and other miscellaneous revenues, and may also include the impact of certain regulatory mechanisms, such as cost-of-service components in customer rates expected to be returned to customers in future periods. Also includes the impacts of a temporary moratorium on late fees and disconnection for nonpayment during the COVID-19 pandemic.

The following tables display Centuri’s revenue, reflected as Utility infrastructure services revenues on the Condensed Consolidated Statements of Income of the Company, representing revenue from contracts with customers disaggregated by service and contract types:

	Three Months Ended June 30,				Six Months Ended June 30,				Twelve Months Ended June 30,
(Thousands of dollars)	2022		2021		2022		2021		2022		2021
Service Types:
Gas infrastructure services	$	418,869	$	346,877	$	679,551	$	568,714	$	1,413,177	$	1,282,008
Electric power infrastructure services	179,749		97,644		361,717		191,605		695,314		435,825
Other	107,472		84,104		188,699		132,281		387,537		294,749
Total Utility infrastructure services revenues	$	706,090	$	528,625	$	1,229,967	$	892,600	$	2,496,028	$	2,012,582

	Three Months Ended June 30,				Six Months Ended June 30,					Twelve Months Ended June 30,
(Thousands of dollars)	2022		2021		2022			2021		2022			2021
Contract Types:
Master services agreement	$	617,489	$	398,650	$	1,062,834	*	$	692,330	$	2,023,482	*	$	1,543,292
Bid contract	88,601		129,975		167,133		*	200,270		472,546		*	469,290
Total Utility infrastructure services revenues	$	706,090	$	528,625	$	1,229,967		$	892,600	$	2,496,028		$	2,012,582
Unit price contracts	$	421,927	$	361,926	$	724,450		$	596,375	$	1,497,157		$	1,344,626
Fixed price contracts	128,793		50,455		215,330			85,049		398,023			179,194
Time and materials contracts	155,370		116,244		290,187			211,176		600,848			488,762
Total Utility infrastructure services revenues	$	706,090	$	528,625	$	1,229,967		$	892,600	$	2,496,028		$	2,012,582

* The Company identified an error in the first quarter 2022 disclosure which resulted in an understatement of $88.8 million in the master services agreement category and an overstatement by the same amount in the bid contract category. Management concluded this item was not material to the previously issued financial statements and will revise the first quarter 2022 amounts in future filings.

MountainWest Regulated operations revenues on the Condensed Consolidated Statements of Income of the Company include revenue from contracts with customers, which is shown below, disaggregated by categories of sales and service activities.

	Three Months Ended June 30,		Six Months Ended June 30,
(Thousands of dollars)	2022
Regulated gas transportation and storage revenues	$	57,786	119,763
NGL revenues	1,876		3,369
Other revenues	2,380		5,859
Revenue from contracts with customers	62,042		128,991
Other revenues	46		90
Total Regulated operations revenues	$	62,088	129,081

Summary of Information about Receivables, Revenue Earned on Contracts in Progress in Excess of Billings, Which are Included Within Accounts Receivable, Net of Allowances, and Amounts Billed in Excess of Revenue Earned on Contracts

The following table provides information about contracts receivable and revenue earned on contracts in progress in excess of billings (contract assets), both of which are included within Accounts receivable, net of allowances, as well as amounts billed in excess of revenue earned on contracts (contract liabilities), which are included in Other current liabilities as of June 30, 2022 and December 31, 2021 on the Company’s Condensed Consolidated Balance Sheets:

(Thousands of dollars)	June 30, 2022		December 31, 2021
Contracts receivable, net	$	332,433	$	296,005
Revenue earned on contracts in progress in excess of billings	254,259		214,774
Amounts billed in excess of revenue earned on contracts	13,738		11,860

Schedule of Utility Infrastructure Services Contracts Receivable

Utility infrastructure services contracts receivable consists of the following:

(Thousands of dollars)	June 30, 2022		December 31, 2021
Billed on completed contracts and contracts in progress	$	331,173	$	292,770
Other receivables	1,408		3,492
Contracts receivable, gross	332,581		296,262
Allowance for doubtful accounts	(148)		(257)
Contracts receivable, net	$	332,433	$	296,005

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Common Stock (Tables)

6 Months Ended

Jun. 30, 2022

Equity [Abstract]

Schedule of Common Stock Activity

The following table provides the life-to-date activity under that program through June 30, 2022:

Gross proceeds	$	158,180,343
Less: agent commissions	(1,581,803)
Net proceeds	$	156,598,540
Number of shares sold	2,302,407
Weighted average price per share	$	68.70

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Debt (Tables)

6 Months Ended

Jun. 30, 2022

Debt Disclosure [Abstract]

Schedule of Carrying Amounts and Estimated Fair Values of Long-Term Debt

Details surrounding the fair value and individual carrying values of instruments are provided in the table that follows.

	June 30, 2022				December 31, 2021
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
(Thousands of dollars)
Southwest Gas Corporation:
Debentures:
Notes, 6.1%, due 2041	$	125,000	$	126,410	$	125,000	$	166,380
Notes, 4.05%, due 2032	600,000		549,396		—		—
Notes, 3.875%, due 2022	—		—		250,000		250,603
Notes, 4.875%, due 2043	250,000		230,653		250,000		307,538
Notes, 3.8%, due 2046	300,000		235,140		300,000		329,055
Notes, 3.7%, due 2028	300,000		283,260		300,000		325,191
Notes, 4.15%, due 2049	300,000		250,461		300,000		342,030
Notes, 2.2%, due 2030	450,000		365,054		450,000		440,838
Notes, 3.18%, due 2051	300,000		211,326		300,000		292,116
8% Series, due 2026	75,000		84,078		75,000		92,623
Medium-term notes, 7.78% series, due 2022	—		—		25,000		25,122
Medium-term notes, 7.92% series, due 2027	25,000		27,821		25,000		31,555
Medium-term notes, 6.76% series, due 2027	7,500		7,839		7,500		8,949
Unamortized discount and debt issuance costs	(26,627)				(19,959)
	2,705,873				2,387,541
Revolving credit facility and commercial paper	—		—		130,000		130,000
Industrial development revenue bonds:
Tax-exempt Series A, due 2028	50,000		50,000		50,000		50,000
2003 Series A, due 2038	50,000		50,000		50,000		50,000
2008 Series A, due 2038	50,000		50,000		50,000		50,000
2009 Series A, due 2039	50,000		50,000		50,000		50,000
Unamortized discount and debt issuance costs	(1,774)				(1,938)
	198,226				198,062
Less: current maturities	—				(275,000)
Southwest Gas Corporation total long-term debt, less current maturities	$	2,904,099			$	2,440,603
Southwest Gas Holdings, Inc.:
Centuri secured term loan facility	$	1,011,413	$	970,329	$	1,117,138	$	1,117,841
Centuri secured revolving credit facility	145,885		145,759		103,329		103,749
MountainWest unsecured senior notes, 3.53%, due in 2028	101,922		90,430		102,078		102,078
MountainWest unsecured senior notes, 4.875%, due in 2041	199,599		157,894		199,926		199,926
MountainWest unsecured senior notes, 3.91%, due in 2038	147,786		113,703		147,735		147,735
Other debt obligations	141,653		129,810		51,665		50,003
Unamortized discount and debt issuance costs	(22,627)				(24,466)
Less: current maturities	(41,276)				(22,324)
Southwest Gas Holdings, Inc. total long-term debt, less current maturities	$	4,588,454			$	4,115,684

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Other Comprehensive Income and Accumulated Other Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2022

Equity [Abstract]

Schedule of Related Tax Effects Allocated to Each Component of Other Comprehensive Income (Loss)

Related Tax Effects Allocated to Each Component of Other Comprehensive Income (Loss)

	Three Months Ended June 30, 2022						Three Months Ended June 30, 2021
(Thousands of dollars)	Before- Tax Amount		Tax (Expense) or Benefit (1)		Net-of- Tax Amount		Before- Tax Amount		Tax (Expense) or Benefit (1)		Net-of- Tax Amount
Defined benefit pension plans:
Amortization of prior service cost	$	44	$	(11)	$	33	$	240	$	(58)	$	182
Amortization of net actuarial (gain)/loss	8,704		(2,089)		6,615		11,148		(2,676)		8,472
Regulatory adjustment	(7,268)		1,744		(5,524)		(9,575)		2,298		(7,277)
Pension plans other comprehensive income (loss)	1,480		(356)		1,124		1,813		(436)		1,377
FSIRS (designated hedging activities):
Amounts reclassified into net income	—		—		—		544		(130)		414
FSIRS other comprehensive income (loss)	—		—		—		544		(130)		414
Total other comprehensive income (loss) - Southwest Gas Corporation	1,480		(356)		1,124		2,357		(566)		1,791
Foreign currency translation adjustments:
Translation adjustments	(2,680)		—		(2,680)		909		—		909
Foreign currency other comprehensive income (loss)	(2,680)		—		(2,680)		909		—		909
Total other comprehensive income (loss) - Southwest Gas Holdings, Inc.	$	(1,200)	$	(356)	$	(1,556)	$	3,266	$	(566)	$	2,700
	Six Months Ended June 30, 2022						Six Months Ended June 30, 2021
(Thousands of dollars)	Before- Tax Amount		Tax (Expense) or Benefit (1)		Net-of- Tax Amount		Before- Tax Amount		Tax (Expense) or Benefit (1)		Net-of- Tax Amount
Defined benefit pension plans:
Amortization of prior service cost	$	88	$	(22)	$	66	$	480	$	(116)	$	364
Amortization of net actuarial (gain)/loss	17,409		(4,178)		13,231		22,297		(5,351)		16,946
Regulatory adjustment	(14,536)		3,489		(11,047)		(19,150)		4,596		(14,554)
Pension plans other comprehensive income (loss)	2,961		(711)		2,250		3,627		(871)		2,756
FSIRS (designated hedging activities):
Amounts reclassified into net income	545		(129)		416		1,088		(261)		827
FSIRS other comprehensive income (loss)	545		(129)		416		1,088		(261)		827
Total other comprehensive income (loss) - Southwest Gas Corporation	3,506		(840)		2,666		4,715		(1,132)		3,583
Foreign currency translation adjustments:
Translation adjustments	(1,433)		—		(1,433)		1,732		—		1,732
Foreign currency other comprehensive income (loss)	(1,433)		—		(1,433)		1,732		—		1,732
Total other comprehensive income (loss) - Southwest Gas Holdings, Inc.	$	2,073	$	(840)	$	1,233	$	6,447	$	(1,132)	$	5,315

	Twelve Months Ended June 30, 2022						Twelve Months Ended June 30, 2021
(Thousands of dollars)	Before- Tax Amount		Tax (Expense) or Benefit (1)		Net-of- Tax Amount		Before- Tax Amount		Tax (Expense) or Benefit (1)		Net-of- Tax Amount
Defined benefit pension plans:
Net actuarial gain/(loss)	$	59,176	$	(14,202)	$	44,974	$	(57,539)	$	13,809	$	(43,730)
Amortization of prior service cost	567		(136)		431		1,057		(255)		802
Amortization of net actuarial (gain)/loss	39,709		(9,530)		30,179		41,212		(9,890)		31,322
Regulatory adjustment	(83,580)		20,060		(63,520)		5,075		(1,219)		3,856
Pension plans other comprehensive income (loss)	15,872		(3,808)		12,064		(10,195)		2,445		(7,750)
FSIRS (designated hedging activities):
Amounts reclassified into net income	1,631		(390)		1,241		2,662		(639)		2,023
FSIRS other comprehensive income (loss)	1,631		(390)		1,241		2,662		(639)		2,023
Total other comprehensive income (loss) - Southwest Gas Corporation	17,503		(4,198)		13,305		(7,533)		1,806		(5,727)
Foreign currency translation adjustments:
Translation adjustments	(3,145)		—		(3,145)		5,656		—		5,656
Foreign currency other comprehensive income (loss)	(3,145)		—		(3,145)		5,656		—		5,656
Total other comprehensive income (loss) - Southwest Gas Holdings, Inc.	$	14,358	$	(4,198)	$	10,160	$	(1,877)	$	1,806	$	(71)

(1)Tax amounts are calculated using a 24% rate. The Company has elected to indefinitely reinvest, in Canada, the earnings of Centuri’s Canadian subsidiaries, thus precluding deferred taxes on such earnings. As a result of this assertion, and no repatriation of earnings anticipated, the Company is not recognizing a tax effect or presenting a tax expense or benefit for currency translation adjustments reported in Other comprehensive income (loss).

Schedule of Rollforward of Accumulated Other Comprehensive Income

The following table represents a rollforward of AOCI, presented on the Company’s Condensed Consolidated Balance Sheets and its Condensed Consolidated Statements of Equity:

	Defined Benefit Plans						FSIRS						Foreign Currency Items
(Thousands of dollars)	Before-Tax		Tax (Expense) Benefit (4)		After-Tax		Before-Tax		Tax (Expense) Benefit (4)		After-Tax		Before-Tax		Tax (Expense) Benefit		After-Tax		AOCI
Beginning Balance AOCI December 31, 2021	$	(61,182)	$	14,685	$	(46,497)	$	(545)	$	129	$	(416)	$	152	$	—	$	152	$	(46,761)
Translation adjustments	—		—		—		—		—		—		(1,433)		—		(1,433)		(1,433)
Other comprehensive income (loss) before reclassifications	—		—		—		—		—		—		(1,433)		—		(1,433)		(1,433)
FSIRS amount reclassified from AOCI (1)	—		—		—		545		(129)		416		—		—		—		416
Amortization of prior service cost (2)	88		(22)		66		—		—		—		—		—		—		66
Amortization of net actuarial loss (2)	17,409		(4,178)		13,231		—		—		—		—		—		—		13,231
Regulatory adjustment (3)	(14,536)		3,489		(11,047)		—		—		—		—		—		—		(11,047)
Net current period other comprehensive income (loss) attributable to Southwest Gas Holdings, Inc.	2,961		(711)		2,250		545		(129)		416		(1,433)		—		(1,433)		1,233
Ending Balance AOCI June 30, 2022	$	(58,221)	$	13,974	$	(44,247)	$	—	$	—	$	—	$	(1,281)	$	—	$	(1,281)	$	(45,528)

(1)The FSIRS reclassification amount is included in Net interest deductions on the Company’s Condensed Consolidated Statements of Income.

(2)These AOCI components are included in the computation of net periodic benefit cost (see Note 2 – Components of Net Periodic Benefit Cost for additional details).

(3)The regulatory adjustment represents the portion of the activity above that is expected to be recovered through rates in the future (the related regulatory asset is included in Deferred charges and other assets on the Company’s Condensed Consolidated Balance Sheets).

(4)Tax amounts are calculated using a 24% rate.

The following table represents a rollforward of AOCI, presented on Southwest’s Condensed Consolidated Balance Sheets:

	Defined Benefit Plans						FSIRS
(Thousands of dollars)	Before-Tax		Tax (Expense) Benefit (8)		After-Tax		Before-Tax		Tax (Expense) Benefit (8)		After-Tax		AOCI
Beginning Balance AOCI December 31, 2021	$	(61,182)	$	14,685	$	(46,497)	$	(545)	$	129	$	(416)	$	(46,913)
FSIRS amount reclassified from AOCI (5)	—		—		—		545		(129)		416		416
Amortization of prior service cost (6)	88		(22)		66		—		—		—		66
Amortization of net actuarial loss (6)	17,409		(4,178)		13,231		—		—		—		13,231
Regulatory adjustment (7)	(14,536)		3,489		(11,047)		—		—		—		(11,047)
Net current period other comprehensive income attributable to Southwest Gas Corporation	2,961		(711)		2,250		545		(129)		416		2,666
Ending Balance AOCI June 30, 2022	$	(58,221)	$	13,974	$	(44,247)	$	—	$	—	$	—	$	(44,247)

(5)    The FSIRS reclassification amount is included in Net interest deductions on Southwest’s Condensed Consolidated Statements of Income.

(6)These AOCI components are included in the computation of net periodic benefit cost (see Note 2 – Components of Net Periodic Benefit Cost for additional details).

(7)The regulatory adjustment represents the portion of the activity above that is expected to be recovered through rates in the future (the related regulatory asset is included in Deferred charges and other assets on Southwest’s Condensed Consolidated Balance Sheets).

(8)Tax amounts are calculated using a 24% rate.

The following table represents amounts (before income tax impacts) included in AOCI (in the tables above), that have not yet been recognized in net periodic benefit cost:

(Thousands of dollars)	June 30, 2022		December 31, 2021
Net actuarial loss	$	(381,601)	$	(399,010)
Prior service cost	(1,440)		(1,528)
Less: amount recognized in regulatory assets	324,820		339,356
Recognized in AOCI	$	(58,221)	$	(61,182)

Schedule of Amount Recognized Before Income Tax in Accumulated Other Comprehensive Income

The following table represents amounts (before income tax impacts) included in AOCI (in the tables above), that have not yet been recognized in net periodic benefit cost:

(Thousands of dollars)	June 30, 2022		December 31, 2021
Net actuarial loss	$	(381,601)	$	(399,010)
Prior service cost	(1,440)		(1,528)
Less: amount recognized in regulatory assets	324,820		339,356
Recognized in AOCI	$	(58,221)	$	(61,182)

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Segment Information (Tables)

6 Months Ended

Jun. 30, 2022

Segment Reporting [Abstract]

Schedule Of Accounts Receivable Not Eliminated During Consolidation

Accounts receivable for these services, which are not eliminated during consolidation, are presented in the table below:

(Thousands of dollars)	June 30, 2022		December 31, 2021
Centuri accounts receivable for services provided to Southwest	$	16,915	$	15,166

Schedule of Segment Reporting Information

The financial information pertaining to the natural gas distribution, utility infrastructure services, and pipeline and storage segments are as follows:

(Thousands of dollars)	Natural Gas Distribution		Utility Infrastructure Services		Pipeline and Storage		Other		Total
Three Months Ended June 30, 2022
Revenues from external customers	$	377,942	$	672,119	$	62,088	$	—	$	1,112,149
Intersegment revenues	—		33,971		—		—		33,971
Total	$	377,942	$	706,090	$	62,088	$	—	$	1,146,120
Segment net income (loss)	$	(2,266)	$	4,741	$	15,076	$	(24,126)	$	(6,575)
Three Months Ended June 30, 2021
Revenues from external customers	$	292,796	$	504,941	$	—	$	—	$	797,737
Intersegment revenues	—		23,684		—		—		23,684
Total	$	292,796	$	528,625	$	—	$	—	$	821,421
Segment net income (loss)	$	11,413	$	15,116	$	—	$	(1,410)	$	25,119
(Thousands of dollars)	Natural Gas Operations		Utility Infrastructure Services		Pipeline and Storage		Other		Total
Six Months Ended June 30, 2022
Revenues from external customers	$	1,054,481	$	1,167,663	$	129,081	$	—	$	2,351,225
Intersegment revenues	—		62,304		—		—		62,304
Total	$	1,054,481	$	1,229,967	$	129,081	$	—	$	2,413,529
Segment net income (loss)	$	109,529	$	(18,745)	$	32,006	$	(33,187)	$	89,603
Six Months Ended June 30, 2021
Revenues from external customers	$	814,728	$	844,713	$	—	$	—	$	1,659,441
Intersegment revenues	—		47,887		—		—		47,887
Total	$	814,728	$	892,600	$	—	$	—	$	1,707,328
Segment net income (loss)	$	130,128	$	14,257	$	—	$	(1,973)	$	142,412

(Thousands of dollars)	Natural Gas Distribution		Utility Infrastructure Services		Pipeline and Storage		Other		Total
Twelve Months Ended June 30, 2022
Revenues from external customers	$	1,761,543	$	2,379,265	$	129,081	$	—	$	4,269,889
Intersegment revenues	—		116,763		—		—		116,763
Total	$	1,761,543	$	2,496,028	$	129,081	$	—	$	4,386,652
Segment net income (loss)	$	166,536	$	7,418	$	32,006	$	(57,990)	$	147,970
Twelve Months Ended June 30, 2021
Revenues from external customers	$	1,400,052	$	1,899,961	$	—	$	—	$	3,300,013
Intersegment revenues	—		112,621		—		—		112,621
Total	$	1,400,052	$	2,012,582	$	—	$	—	$	3,412,634
Segment net income (loss)	$	193,705	$	73,056	$	—	$	(2,532)	$	264,229

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Business Acquisitions (Tables)

6 Months Ended

Jun. 30, 2022

Business Combination and Asset Acquisition [Abstract]

Summary of Fair Values of Assets Acquired and Liabilities Assumed

The preliminary estimated fair values of assets acquired and liabilities assumed as of August 27, 2021, and as updated through June 30, 2022, are as follows:

(Millions of dollars)	Acquisition Date		Measurement Period Adjustments		Revised Acquisition Date
Cash and cash equivalents	$	1.9	$	—	$	1.9
Accounts receivable	69.1		(8.6)		60.5
Contract assets	40.1		7.4		47.5
Income taxes receivable, net	0.7		—		0.7
Right of use assets under operating leases	1.5		—		1.5
Prepaid expenses	5.2		—		5.2
Property and equipment	118.1		1.2		119.3
Intangible assets	335.0		(31.5)		303.5
Goodwill	446.8		1.8		448.6
Total assets acquired	1,018.4		$	(29.7)	$	988.7
Trade and other payables	46.2		—		46.2
Finance lease obligations	27.5		1.2		28.7
Contract liabilities	12.7		—		12.7
Operating lease obligations	1.5		—		1.5
Other liabilities	5.3		(1.2)		4.1
Deferred tax liabilities	94.8		(23.4)		71.4
Total liabilities assumed and noncontrolling interest	188.0		(23.4)		164.6
Net assets acquired	$	830.4	$	(6.3)	$	824.1

The preliminary estimated fair values of assets acquired and liabilities assumed as of December 31, 2021, and as updated through June 30, 2022, are as follows:

(Millions of dollars)	Acquisition Date		Measurement Period Adjustments		Revised Acquisition Date
Gas plant, net	$	1,047.4	$	—	$	1,047.4
Other property and investments	51.3		—		51.3
Cash and cash equivalents	17.6		—		17.6
Accounts receivable, net of allowances	26.6		2.9		29.5
Prepaid and other current assets	27.4		—		27.4
Deferred charges and other assets	31.1		—		31.1
Goodwill	986.2		(28.2)		958.0
Deferred income taxes, net	15.4		20.9		36.3
Total assets acquired	2,203.0		(4.4)		2,198.6
Long-term debt	449.7		—		449.7
Accounts payable	7.0		—		7.0
Deferred purchased gas costs	5.7		—		5.7
Customer deposits	3.2		—		3.2
Accrued general taxes	0.4		—		0.4
Accrued interest	4.7		—		4.7
Other current liabilities	14.5		—		14.5
Accumulated removal costs	56.6		—		56.6
Other deferred credits	85.6		—		85.6
Total liabilities assumed	627.4		—		627.4
Net assets acquired	$	1,575.6	$	(4.4)	$	1,571.2

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Background, Organization, and Summary of Significant Accounting Policies - Narratives (Details)	1 Months Ended		3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($)	Aug. 31, 2021 person	Jun. 30, 2022 USD ($) director	Jun. 30, 2022 USD ($) director	Jun. 30, 2022 USD ($) director	May 09, 2022 $ / shares	Dec. 31, 2021 USD ($)	Nov. 30, 2021	Oct. 10, 2021	Nov. 30, 2018
Significant Accounting Policies [Line Items]
Number of new board of directors appointed | director			3	3	3
Rights agreement amendment, beneficial ownership percentage						24.90%			10.00%
Rights agreement amendment, updated tender price (in USD per share) | $ / shares						$ 82.50
Capital expenditures incurred but not yet paid, increase (decrease)				$ (11,600,000)	$ 6,500,000
Deferred purchased gas costs recovered or refunded period				1 year
Gas pipe materials and operating supplies			$ 74,500,000	$ 74,500,000	74,500,000		$ 67,400,000
Accrued purchased gas cost			10,200,000	10,200,000	10,200,000		52,000,000
Goodwill impairment				0
Dividends declared but not yet paid			41,500,000	41,500,000	41,500,000		36,000,000
Payments for redemption of redeemable noncontrolling interest	$ 39,600,000
Percentage of redeemable noncontrolling interest redeemed	5.00%
Redemption value adjustments				35,978,000
Loss contingency, number of individuals injured | person		4
Linetec
Significant Accounting Policies [Line Items]
Redemption value adjustments				35,978,000
Drum
Significant Accounting Policies [Line Items]
Redemption value adjustments				0
Money Market Funds
Significant Accounting Policies [Line Items]
Money market fund investments			97,000,000	97,000,000	97,000,000		20,000,000
Southwest Gas Corporation
Significant Accounting Policies [Line Items]
Capital expenditures incurred but not yet paid, increase (decrease)				(18,300,000)	6,600,000
Gas pipe materials and operating supplies			70,200,000	70,200,000	70,200,000		62,900,000
Self-insured retention amount			1,000,000	1,000,000	1,000,000
Threshold amount above self-insured retention			4,000,000	4,000,000	4,000,000
Loss contingency, maximum			5,000,000	5,000,000	5,000,000
Loss contingency accrual							5,000,000
Loss contingency recorded			6,200,000
Southwest Gas Corporation | Money Market Funds
Significant Accounting Policies [Line Items]
Money market fund investments			$ 77,000,000	$ 77,000,000	$ 77,000,000		$ 0
Previous Owner Of Linetec | Linetec
Significant Accounting Policies [Line Items]
Ownership percentage by noncontrolling owners	15.00%									20.00%
Certain Members Of Riggs Distler Management | Drum
Significant Accounting Policies [Line Items]
Ownership percentage by noncontrolling owners			1.42%	1.42%	1.42%			1.42%
Minimum
Significant Accounting Policies [Line Items]
Number of new board of directors appointed | director			2	2	2
Number of strategic transactions committee directors | director			3	3	3
Minimum | Centuri
Significant Accounting Policies [Line Items]
Entity separation, completion period	9 months
Maximum
Significant Accounting Policies [Line Items]
Number of strategic transactions committee directors | director			6	6	6
Maximum | Centuri
Significant Accounting Policies [Line Items]
Entity separation, completion period	12 months

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Background, Organization, and Summary of Significant Accounting Policies - Schedule of Other Property and Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Other property and investments	$ 57,049	$ 59,337
Total	1,312,701	1,316,479
Non-regulated property, equipment, and intangibles	1,678,683	1,616,392
Non-regulated accumulated provision for depreciation and amortization	(569,630)	(512,343)
Southwest Gas Corporation
Property, Plant and Equipment [Line Items]
Net cash surrender value of COLI policies	142,819	149,947
Other property and investments	3,780	3,146
Total	$ 146,599	$ 153,093

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Background, Organization, and Summary of Significant Accounting Policies - Schedule of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,781,332
Foreign currency translation adjustment	(1,776)
Goodwill, ending balance	1,750,472
Riggs Distler
Goodwill [Roll Forward]
Measurement period adjustments	(906)
MountainWest
Goodwill [Roll Forward]
Measurement period adjustments	(28,178)
Natural Gas Distribution
Goodwill [Roll Forward]
Goodwill, beginning balance	10,095
Foreign currency translation adjustment	0
Goodwill, ending balance	10,095
Natural Gas Distribution | Riggs Distler
Goodwill [Roll Forward]
Measurement period adjustments	0
Natural Gas Distribution | MountainWest
Goodwill [Roll Forward]
Measurement period adjustments	0
Utility Infrastructure Services
Goodwill [Roll Forward]
Goodwill, beginning balance	785,058
Foreign currency translation adjustment	(1,776)
Goodwill, ending balance	782,376
Utility Infrastructure Services | Riggs Distler
Goodwill [Roll Forward]
Measurement period adjustments	(906)
Utility Infrastructure Services | MountainWest
Goodwill [Roll Forward]
Measurement period adjustments	0
Pipeline and Storage
Goodwill [Roll Forward]
Goodwill, beginning balance	986,179
Foreign currency translation adjustment	0
Goodwill, ending balance	958,001
Pipeline and Storage | Riggs Distler
Goodwill [Roll Forward]
Measurement period adjustments
Pipeline and Storage | MountainWest
Goodwill [Roll Forward]
Measurement period adjustments	$ (28,178)

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Background, Organization, and Summary of Significant Accounting Policies - Other Income (Deductions) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Other income (deductions)
Equity AFUDC	$ 236	$ 0	$ 418	$ 0	$ 418	$ 0
Miscellaneous income and (expense)	(580)	(246)	(1,351)	(337)	(158)	(444)
Foreign transaction gain (loss)	214	(9)	217	(12)	207	(12)
Equity in earnings of unconsolidated investments	728	109	1,243	101	1,368	156
Total other income (deductions)	(2,835)	(1,311)	(1,591)	(863)	(4,227)	5,193
Southwest Gas Corporation
Other income (deductions)
Change in COLI policies	(5,200)	3,100	(7,200)	5,800	(4,200)	18,500
Interest income	3,198	1,231	5,999	1,947	9,165	4,160
Equity AFUDC	81	(981)	157	0	157	2,543
Other components of net periodic benefit cost	(187)	(3,505)	(375)	(7,010)	(7,386)	(17,021)
Miscellaneous income and (expense)	(1,325)	(1,010)	(699)	(1,352)	(3,798)	(2,689)
Total other income (deductions)	$ (3,433)	$ (1,165)	$ (2,118)	$ (615)	$ (6,062)	$ 5,493

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Background, Organization, and Summary of Significant Accounting Policies - Summary of Redeemable Noncontrolling Interest (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)
Movement In Redeemable Noncontrolling Interest [Roll Forward]
Redeemable noncontrolling interest, beginning balance	$ 196,717
Net income (loss) attributable to redeemable noncontrolling interests	1,566
Redemption value adjustments	(35,978)
Redemption of equity interest from noncontrolling party	(39,649)
Redeemable noncontrolling interest, ending balance	122,656
Linetec
Movement In Redeemable Noncontrolling Interest [Roll Forward]
Redeemable noncontrolling interest, beginning balance	184,148
Net income (loss) attributable to redeemable noncontrolling interests	1,576
Redemption value adjustments	(35,978)
Redemption of equity interest from noncontrolling party	(39,649)
Redeemable noncontrolling interest, ending balance	110,097
Drum
Movement In Redeemable Noncontrolling Interest [Roll Forward]
Redeemable noncontrolling interest, beginning balance	12,569
Net income (loss) attributable to redeemable noncontrolling interests	(10)
Redemption value adjustments	0
Redemption of equity interest from noncontrolling party	0
Redeemable noncontrolling interest, ending balance	$ 12,559

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Background, Organization, and Summary of Significant Accounting Policies - Schedule of Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Weighted average basic shares (in shares)	67,045	58,607	63,909	58,106	62,022	57,348
Effect of dilutive securities:
Restricted stock units (in shares)	145	103	132	91	135	92
Weighted average diluted shares (in shares)	67,190	58,710	64,041	58,197	62,157	57,440
Number of performance share units granted (in shares)	136	95	125	85	124	83

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Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Qualified Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 11,028	$ 10,290	$ 22,056	$ 20,580	$ 42,635	$ 37,730
Interest cost	11,251	10,108	22,502	20,216	42,718	42,994
Expected return on plan assets	(19,978)	(18,088)	(39,956)	(36,176)	(76,132)	(68,824)
Amortization of net actuarial loss	8,117	10,489	16,234	20,978	37,211	38,990
Net periodic benefit cost	10,418	12,799	20,836	25,598	46,432	50,890
SERP
Defined Benefit Plan Disclosure [Line Items]
Service cost	106	132	212	263	475	457
Interest cost	360	358	720	716	1,435	1,517
Amortization of net actuarial loss	587	660	1,175	1,320	2,497	2,223
Net periodic benefit cost	1,053	1,150	2,107	2,299	4,407	4,197
PBOP
Defined Benefit Plan Disclosure [Line Items]
Service cost	485	423	970	846	1,815	1,636
Interest cost	613	548	1,226	1,096	2,323	2,388
Expected return on plan assets	(807)	(810)	(1,614)	(1,620)	(3,233)	(3,324)
Amortization of prior service costs	44	240	88	480	567	1,057
Net periodic benefit cost	$ 335	$ 401	$ 670	$ 802	$ 1,472	$ 1,757

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Revenue - Schedule of Regulated Operations Revenues: Natural Gas Distribution Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total Regulated operations revenues	$ 440,030	$ 292,796	$ 1,183,562	$ 814,728	$ 1,890,624	$ 1,400,052
Natural Gas Distribution
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	363,531	291,344	1,058,866	826,864	1,729,752	1,402,156
Alternative revenue program revenues (deferrals)	11,022	(1,531)	(12,477)	(17,904)	18,608	(6,110)
Other revenues	3,389	2,983	8,092	5,768	13,183	4,006
Total Regulated operations revenues	377,942	292,796	1,054,481	814,728	1,761,543	1,400,052
Residential | Natural Gas Distribution
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	228,573	193,322	743,159	596,465	1,182,306	995,132
Small commercial | Natural Gas Distribution
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	78,730	56,093	202,714	137,491	335,437	235,114
Large commercial | Natural Gas Distribution
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	20,989	13,158	41,150	25,831	72,690	47,818
Industrial/other | Natural Gas Distribution
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10,773	6,974	20,745	20,744	42,314	33,785
Transportation | Natural Gas Distribution
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 24,466	$ 21,797	$ 51,098	$ 46,333	$ 97,005	$ 90,307

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Revenue - Schedule of Regulated Operations Revenues: Utility Infrastructure Services Segment (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Centuri
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 706,090		$ 528,625	$ 1,229,967	$ 892,600	$ 2,496,028	$ 2,012,582
Master services agreement | Understatement Of Master Services Category
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		$ (88,800)
Master services agreement | Centuri
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	617,489		398,650	1,062,834	692,330	2,023,482	1,543,292
Bid contract | Overstatement Of Bid Contract Category
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		$ 88,800
Bid contract | Centuri
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	88,601		129,975	167,133	200,270	472,546	469,290
Unit price contracts | Centuri
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	421,927		361,926	724,450	596,375	1,497,157	1,344,626
Fixed price contracts | Centuri
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	128,793		50,455	215,330	85,049	398,023	179,194
Time and materials contracts | Centuri
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	155,370		116,244	290,187	211,176	600,848	488,762
Gas infrastructure services | Centuri
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	418,869		346,877	679,551	568,714	1,413,177	1,282,008
Electric power infrastructure services | Centuri
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	179,749		97,644	361,717	191,605	695,314	435,825
Other | Centuri
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 107,472		$ 84,104	$ 188,699	$ 132,281	$ 387,537	$ 294,749

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Revenue - Summary of Information about Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Contracts receivable, net	$ 332,433	$ 296,005
Revenue earned on contracts in progress in excess of billings	254,259	214,774
Amounts billed in excess of revenue earned on contracts	$ 13,738	$ 11,860

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Revenue - Narratives (Details) $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($) contract
Segment Reporting Information [Line Items]
Change in contract liability, revenue recognized	$ 11.9
Centuri
Segment Reporting Information [Line Items]
Number of contracts with original duration more than one year | contract	47
Centuri | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01
Segment Reporting Information [Line Items]
Transaction price allocated to unsatisfied performance obligations of contracts	$ 465.7
Transaction price allocated to unsatisfied performance obligations of contracts, period	2 years 10 months 24 days

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Revenue - Schedule of Utility Infrastructure Services Contracts Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Contracts receivable, net	$ 332,433	$ 296,005
Utility Infrastructure Services
Disaggregation of Revenue [Line Items]
Contracts receivable, gross	332,581	296,262
Allowance for doubtful accounts	(148)	(257)
Contracts receivable, net	332,433	296,005
Utility Infrastructure Services | Billed on completed contracts and contracts in progress
Disaggregation of Revenue [Line Items]
Contracts receivable, gross	331,173	292,770
Utility Infrastructure Services | Other receivables
Disaggregation of Revenue [Line Items]
Contracts receivable, gross	$ 1,408	$ 3,492

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Revenue - Schedule of Regulated Operations Revenues: Pipeline and Storage Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Total Regulated operations revenues	$ 440,030	$ 292,796	$ 1,183,562	$ 814,728	$ 1,890,624	$ 1,400,052
Pipeline and Storage
Segment Reporting Information [Line Items]
Revenue from contracts with customers	62,042		128,991
Other revenues	46		90
Total Regulated operations revenues	62,088		129,081
Pipeline and Storage | Regulated gas transportation and storage revenues
Segment Reporting Information [Line Items]
Revenue from contracts with customers	57,786		119,763
Pipeline and Storage | NGL revenues
Segment Reporting Information [Line Items]
Revenue from contracts with customers	1,876		3,369
Pipeline and Storage | Other revenues
Segment Reporting Information [Line Items]
Revenue from contracts with customers	$ 2,380		$ 5,859

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Common Stock - Narratives (Details) - USD ($) $ / shares in Units, shares in Thousands	1 Months Ended		6 Months Ended
	Mar. 31, 2022	Nov. 30, 2021	Jun. 30, 2022	May 09, 2022	Oct. 10, 2021	Apr. 08, 2021
Class of Stock [Line Items]
Sale of stock, number of shares	6,325
Sale of stock, price per share (in USD per share)			$ 74.00
Net proceeds from sale of stock	$ 452,300,000
Sale of stock, underwriters' discount	$ 15,800,000
Rights agreement amendment, beneficial ownership percentage				24.90%	10.00%
Term Loan Facility Due December 30, 2022 | Loans Payable
Class of Stock [Line Items]
Debt instrument, term		364 days
Restricted Stock/Unit Plan, and Management Incentive Plan
Class of Stock [Line Items]
Common stock issued (in shares)			191
Dividend Reinvestment and Stock Purchase Plan
Class of Stock [Line Items]
Common stock issued (in shares)			66
Common stock issued, amount			$ 5,100,000
Equity Shelf Program
Class of Stock [Line Items]
Sale of stock, amount of common stock offered for sale						$ 500,000,000
Sale of stock, amount of common stock available for sale			$ 341,800,000

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Common Stock - Activity of Equity Shelf Program (Details) - USD ($)	6 Months Ended		12 Months Ended		15 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022
Class of Stock [Line Items]
Net proceeds	$ 456,280,000	$ 121,302,000	$ 548,619,000	$ 205,049,000
Equity Shelf Program
Class of Stock [Line Items]
Gross proceeds					$ 158,180,343
Less: agent commissions					(1,581,803)
Net proceeds					$ 156,598,540
Number of shares sold (in shares)					2,302,407
Weighted average price per share (in USD per share)					$ 68.70

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Debt - Schedule of Carrying Amounts and Estimated Fair Values of Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Less: current maturities	$ (41,276)	$ (297,324)
Long-term debt, less current maturities	4,588,454	4,115,684
Southwest Gas Corporation
Debt Instrument [Line Items]
Less: current maturities	0	(275,000)
Long-term debt, less current maturities	$ 2,904,099	$ 2,440,603
MountainWest unsecured senior notes, 3.53%, due in 2028
Debt Instrument [Line Items]
Debt instrument interest rate	3.53%
MountainWest unsecured senior notes, 4.875%, due in 2041
Debt Instrument [Line Items]
Debt instrument interest rate	4.875%
MountainWest unsecured senior notes, 3.91%, due in 2038
Debt Instrument [Line Items]
Debt instrument interest rate	3.91%
Debentures | Notes, 6.1%, due 2041 | Southwest Gas Corporation
Debt Instrument [Line Items]
Debt instrument interest rate	6.10%
Debentures | Notes, 4.05%, due 2032 | Southwest Gas Corporation
Debt Instrument [Line Items]
Debt instrument interest rate	4.05%
Debentures | Notes, 3.875%, due 2022 | Southwest Gas Corporation
Debt Instrument [Line Items]
Debt instrument interest rate	3.875%	3.875%
Debentures | Notes, 4.875%, due 2043 | Southwest Gas Corporation
Debt Instrument [Line Items]
Debt instrument interest rate	4.875%
Debentures | Notes, 3.8%, due 2046 | Southwest Gas Corporation
Debt Instrument [Line Items]
Debt instrument interest rate	3.80%
Debentures | Notes, 3.7%, due 2028 | Southwest Gas Corporation
Debt Instrument [Line Items]
Debt instrument interest rate	3.70%
Debentures | Notes, 4.15%, due 2049 | Southwest Gas Corporation
Debt Instrument [Line Items]
Debt instrument interest rate	4.15%
Debentures | Notes, 2.2%, due 2030 | Southwest Gas Corporation
Debt Instrument [Line Items]
Debt instrument interest rate	2.20%
Debentures | Notes, 3.18%, due 2051 | Southwest Gas Corporation
Debt Instrument [Line Items]
Debt instrument interest rate	3.18%
Debentures | 8% Series, due 2026 | Southwest Gas Corporation
Debt Instrument [Line Items]
Debt instrument interest rate	8.00%
Debentures | Medium-term notes, 7.78% series, due 2022 | Southwest Gas Corporation
Debt Instrument [Line Items]
Debt instrument interest rate		7.78%
Debentures | Medium-term notes, 7.92% series, due 2027 | Southwest Gas Corporation
Debt Instrument [Line Items]
Debt instrument interest rate	7.92%
Debentures | Medium-term notes, 6.76% series, due 2027 | Southwest Gas Corporation
Debt Instrument [Line Items]
Debt instrument interest rate	6.76%
Carrying Amount
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	$ (22,627)	$ (24,466)
Less: current maturities	(41,276)	(22,324)
Long-term debt, less current maturities	4,588,454	4,115,684
Carrying Amount | Southwest Gas Corporation
Debt Instrument [Line Items]
Less: current maturities	0	(275,000)
Long-term debt, less current maturities	2,904,099	2,440,603
Carrying Amount | Centuri secured revolving credit facility | Centuri
Debt Instrument [Line Items]
Long-term debt, gross	145,885	103,329
Carrying Amount | Debentures | Southwest Gas Corporation
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	(26,627)	(19,959)
Long-term debt	2,705,873	2,387,541
Carrying Amount | Debentures | Notes, 6.1%, due 2041 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	125,000	125,000
Carrying Amount | Debentures | Notes, 4.05%, due 2032 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	600,000	0
Carrying Amount | Debentures | Notes, 3.875%, due 2022 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	0	250,000
Carrying Amount | Debentures | Notes, 4.875%, due 2043 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	250,000	250,000
Carrying Amount | Debentures | Notes, 3.8%, due 2046 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	300,000	300,000
Carrying Amount | Debentures | Notes, 3.7%, due 2028 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	300,000	300,000
Carrying Amount | Debentures | Notes, 4.15%, due 2049 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	300,000	300,000
Carrying Amount | Debentures | Notes, 2.2%, due 2030 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	450,000	450,000
Carrying Amount | Debentures | Notes, 3.18%, due 2051 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	300,000	300,000
Carrying Amount | Debentures | 8% Series, due 2026 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	75,000	75,000
Carrying Amount | Debentures | Medium-term notes, 7.78% series, due 2022 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	0	25,000
Carrying Amount | Debentures | Medium-term notes, 7.92% series, due 2027 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	25,000	25,000
Carrying Amount | Debentures | Medium-term notes, 6.76% series, due 2027 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	7,500	7,500
Carrying Amount | Revolving credit facility and commercial paper | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt	0	130,000
Carrying Amount | Industrial development revenue bonds | Southwest Gas Corporation
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	(1,774)	(1,938)
Long-term debt	198,226	198,062
Carrying Amount | Industrial development revenue bonds | Tax-exempt Series A, due 2028 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	50,000	50,000
Carrying Amount | Industrial development revenue bonds | 2003 Series A, due 2038 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	50,000	50,000
Carrying Amount | Industrial development revenue bonds | 2008 Series A, due 2038 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	50,000	50,000
Carrying Amount | Industrial development revenue bonds | 2009 Series A, due 2039 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	50,000	50,000
Carrying Amount | Secured Debt | Centuri secured term loan facility | Centuri
Debt Instrument [Line Items]
Long-term debt, gross	1,011,413	1,117,138
Carrying Amount | Unsecured Debt | MountainWest unsecured senior notes, 3.53%, due in 2028
Debt Instrument [Line Items]
Long-term debt, gross	101,922	102,078
Carrying Amount | Unsecured Debt | MountainWest unsecured senior notes, 4.875%, due in 2041
Debt Instrument [Line Items]
Long-term debt, gross	199,599	199,926
Carrying Amount | Unsecured Debt | MountainWest unsecured senior notes, 3.91%, due in 2038
Debt Instrument [Line Items]
Long-term debt, gross	147,786	147,735
Carrying Amount | Other debt obligations
Debt Instrument [Line Items]
Long-term debt, gross	141,653	51,665
Fair Value | Centuri secured revolving credit facility | Centuri
Debt Instrument [Line Items]
Long-term debt, gross	145,759	103,749
Fair Value | Debentures | Notes, 6.1%, due 2041 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	126,410	166,380
Fair Value | Debentures | Notes, 4.05%, due 2032 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	549,396	0
Fair Value | Debentures | Notes, 3.875%, due 2022 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	0	250,603
Fair Value | Debentures | Notes, 4.875%, due 2043 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	230,653	307,538
Fair Value | Debentures | Notes, 3.8%, due 2046 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	235,140	329,055
Fair Value | Debentures | Notes, 3.7%, due 2028 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	283,260	325,191
Fair Value | Debentures | Notes, 4.15%, due 2049 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	250,461	342,030
Fair Value | Debentures | Notes, 2.2%, due 2030 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	365,054	440,838
Fair Value | Debentures | Notes, 3.18%, due 2051 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	211,326	292,116
Fair Value | Debentures | 8% Series, due 2026 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	84,078	92,623
Fair Value | Debentures | Medium-term notes, 7.78% series, due 2022 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	0	25,122
Fair Value | Debentures | Medium-term notes, 7.92% series, due 2027 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	27,821	31,555
Fair Value | Debentures | Medium-term notes, 6.76% series, due 2027 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	7,839	8,949
Fair Value | Revolving credit facility and commercial paper | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt	0	130,000
Fair Value | Industrial development revenue bonds | Tax-exempt Series A, due 2028 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	50,000	50,000
Fair Value | Industrial development revenue bonds | 2003 Series A, due 2038 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	50,000	50,000
Fair Value | Industrial development revenue bonds | 2008 Series A, due 2038 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	50,000	50,000
Fair Value | Industrial development revenue bonds | 2009 Series A, due 2039 | Southwest Gas Corporation
Debt Instrument [Line Items]
Long-term debt, gross	50,000	50,000
Fair Value | Secured Debt | Centuri secured term loan facility | Centuri
Debt Instrument [Line Items]
Long-term debt, gross	970,329	1,117,841
Fair Value | Unsecured Debt | MountainWest unsecured senior notes, 3.53%, due in 2028
Debt Instrument [Line Items]
Long-term debt, gross	90,430	102,078
Fair Value | Unsecured Debt | MountainWest unsecured senior notes, 4.875%, due in 2041
Debt Instrument [Line Items]
Long-term debt, gross	157,894	199,926
Fair Value | Unsecured Debt | MountainWest unsecured senior notes, 3.91%, due in 2038
Debt Instrument [Line Items]
Long-term debt, gross	113,703	147,735
Fair Value | Other debt obligations
Debt Instrument [Line Items]
Long-term debt, gross	$ 129,810	$ 50,003

XML

Debt - Narratives (Details)	1 Months Ended	6 Months Ended
	Nov. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) instrument	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Short-term debt		$ 1,462,747,000		$ 1,909,000,000
Negative working capital condition		(707,000,000)
Term Loan Facility Due December 30, 2022 | Loans Payable
Debt Instrument [Line Items]
Borrowings outstanding under facility		1,150,000,000
Debt instrument face amount	$ 1,600,000,000
Debt instrument, term	364 days
LIBOR
Debt Instrument [Line Items]
Borrowings outstanding under facility		2,160,000,000
Southwest Gas Corporation
Debt Instrument [Line Items]
Short-term debt		225,000,000		$ 250,000,000
Southwest Gas Corporation | March 2021 Term Loan
Debt Instrument [Line Items]
Borrowings outstanding under facility		225,000,000
Debt instrument face amount			$ 250,000,000
Southwest Gas Corporation | Debentures | Notes, 4.05%, due 2032
Debt Instrument [Line Items]
Debt instrument face amount		$ 600,000,000
Debt instrument interest rate		4.05%
Debt instrument discount rate		0.65%
Southwest Gas Corporation | Debentures | Notes, 3.875%, due 2022
Debt Instrument [Line Items]
Debt instrument face amount		$ 250,000,000
Debt instrument interest rate		3.875%		3.875%
Southwest Gas Corporation | LIBOR
Debt Instrument [Line Items]
Borrowings outstanding under facility		$ 0
Centuri | Centuri secured term loan facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		1,145,000,000
Centuri | Centuri Secured Term Loan Facility And Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		1,545,000,000
Borrowings outstanding under facility		1,157,000,000
Debt secured by assets		$ 2,500,000,000
MountainWest
Debt Instrument [Line Items]
Number of private placement | instrument		2
MountainWest | Unsecured Debt
Debt Instrument [Line Items]
Debt instrument face amount		$ 430,000,000
Long-term debt, gross		449,300,000
$400 Million Credit Facility | Southwest Gas Corporation
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		400,000,000
Line of credit designated as long term debt		150,000,000
Line of credit designated for working capital purposes		250,000,000
Long-term debt outstanding		0
Short-term debt		$ 0
$400 Million Credit Facility | Southwest Gas Corporation | SOFR
Debt Instrument [Line Items]
Debt, basis spread on variable rate		1.125%
$400 Million Credit Facility | Southwest Gas Corporation | Alternative base rate
Debt Instrument [Line Items]
Debt, basis spread on variable rate		0.125%
Commercial Paper Program | Southwest Gas Corporation
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		$ 50,000,000
Borrowings outstanding under facility		0
Centuri secured revolving credit facility | Centuri | Line of Credit
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		400,000,000
$100 Million Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		200,000,000
Borrowings outstanding under facility		$ 90,000,000

XML

Other Comprehensive Income and Accumulated Other Comprehensive Income - Related Tax Effects Allocated to OCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	$ (1,200)	$ 3,266	$ 2,073	$ 6,447	$ 14,358	$ (1,877)
Other comprehensive income (loss), tax	(356)	(566)	(840)	(1,132)	(4,198)	1,806
Total other comprehensive income (loss), net of tax	(1,556)	2,700	1,233	$ 5,315	10,160	(71)
Other comprehensive income (loss) before reclassifications, net of tax			$ (1,433)
Effective income tax rate			24.00%	24.00%
Southwest Gas Corporation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	1,480	2,357	$ 3,506	$ 4,715	17,503	(7,533)
Other comprehensive income (loss), tax	(356)	(566)	(840)	(1,132)	(4,198)	1,806
Total other comprehensive income (loss), net of tax	1,124	1,791	2,666	3,583	13,305	(5,727)
Pension plans other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	1,480	1,813	2,961	3,627	15,872	(10,195)
Other comprehensive income (loss), tax	(356)	(436)	(711)	(871)	(3,808)	2,445
Total other comprehensive income (loss), net of tax	1,124	1,377	2,250	2,756	12,064	(7,750)
Pension plans other comprehensive income (loss) | Southwest Gas Corporation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax			2,961
Other comprehensive income (loss), tax			(711)
Total other comprehensive income (loss), net of tax			2,250
Amortization of prior service cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, before Tax	44	240	88	480	567	1,057
Reclassification from AOCI, tax	(11)	(58)	(22)	(116)	(136)	(255)
Reclassification from AOCI, net of tax	33	182	66	364	431	802
Other comprehensive income (loss), before tax			88
Other comprehensive income (loss), tax			(22)
Total other comprehensive income (loss), net of tax			66
Amortization of prior service cost | Southwest Gas Corporation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax			88
Other comprehensive income (loss), tax			(22)
Total other comprehensive income (loss), net of tax			66
Amortization of net actuarial (gain)/loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, before Tax	8,704	11,148	17,409	22,297	39,709	41,212
Reclassification from AOCI, tax	(2,089)	(2,676)	(4,178)	(5,351)	(9,530)	(9,890)
Reclassification from AOCI, net of tax	6,615	8,472	13,231	16,946	30,179	31,322
Other comprehensive income (loss), before tax			17,409
Other comprehensive income (loss), tax			(4,178)
Total other comprehensive income (loss), net of tax			13,231
Other comprehensive income (loss) before reclassifications, before tax					59,176	(57,539)
Other comprehensive income (loss) before reclassifications, tax					(14,202)	13,809
Other comprehensive income (loss) before reclassifications, net of tax					44,974	(43,730)
Amortization of net actuarial (gain)/loss | Southwest Gas Corporation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax			17,409
Other comprehensive income (loss), tax			(4,178)
Total other comprehensive income (loss), net of tax			13,231
Regulatory adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, before Tax	(7,268)	(9,575)	(14,536)	(19,150)	(83,580)	5,075
Reclassification from AOCI, tax	1,744	2,298	3,489	4,596	20,060	(1,219)
Reclassification from AOCI, net of tax	(5,524)	(7,277)	(11,047)	(14,554)	(63,520)	3,856
Other comprehensive income (loss), before tax			(14,536)
Other comprehensive income (loss), tax			3,489
Total other comprehensive income (loss), net of tax			(11,047)
Regulatory adjustment | Southwest Gas Corporation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax			(14,536)
Other comprehensive income (loss), tax			3,489
Total other comprehensive income (loss), net of tax			(11,047)
FSIRS
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, before Tax	0	544	545	1,088	1,631	2,662
Reclassification from AOCI, tax	0	(130)	(129)	(261)	(390)	(639)
Reclassification from AOCI, net of tax	0	414	416	827	1,241	2,023
Other comprehensive income (loss), before tax	0	544	545	1,088	1,631	2,662
Other comprehensive income (loss), tax	0	(130)	(129)	(261)	(390)	(639)
Total other comprehensive income (loss), net of tax	0	414	416	827	1,241	2,023
FSIRS | Southwest Gas Corporation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from AOCI, before Tax			545
Reclassification from AOCI, tax			(129)
Reclassification from AOCI, net of tax			416
Other comprehensive income (loss), before tax			545
Other comprehensive income (loss), tax			(129)
Total other comprehensive income (loss), net of tax			416
Foreign currency items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, before tax	(2,680)	909	(1,433)	1,732	(3,145)	5,656
Other comprehensive income (loss) before reclassifications, tax	0	0	0	0	0	0
Other comprehensive income (loss) before reclassifications, net of tax	$ (2,680)	$ 909	$ (1,433)	$ 1,732	$ (3,145)	$ 5,656

XML

Other Comprehensive Income and Accumulated Other Comprehensive Income - AOCI Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, attributable to parent			$ 2,953,820
Other comprehensive income (loss) before reclassifications, net of tax			(1,433)
Other comprehensive income (loss), before tax	$ (1,200)	$ 3,266	2,073	$ 6,447	$ 14,358	$ (1,877)
Other comprehensive income (loss), tax	(356)	(566)	(840)	(1,132)	(4,198)	1,806
Total other comprehensive income (loss), net of tax	(1,556)	2,700	1,233	$ 5,315	10,160	(71)
Ending balance, attributable to parent	3,458,852		$ 3,458,852		3,458,852
Effective income tax rate			24.00%	24.00%
Southwest Gas Corporation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance					2,429,736
Beginning balance, attributable to parent			$ 2,527,937
Other comprehensive income (loss), before tax	1,480	2,357	3,506	$ 4,715	17,503	(7,533)
Other comprehensive income (loss), tax	(356)	(566)	(840)	(1,132)	(4,198)	1,806
Total other comprehensive income (loss), net of tax	1,124	1,791	2,666	3,583	13,305	(5,727)
Ending balance	2,579,596	2,429,736	2,579,596	2,429,736	2,579,596	2,429,736
Ending balance, attributable to parent	2,579,596		2,579,596		2,579,596
Defined Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, before tax			(61,182)
Beginning balance, tax			14,685
Beginning balance			(46,497)
Other comprehensive income (loss), before tax	1,480	1,813	2,961	3,627	15,872	(10,195)
Other comprehensive income (loss), tax	(356)	(436)	(711)	(871)	(3,808)	2,445
Total other comprehensive income (loss), net of tax	1,124	1,377	2,250	2,756	12,064	(7,750)
Ending balance, before tax	(58,221)		(58,221)		(58,221)
Ending balance, tax	13,974		13,974		13,974
Ending balance	(44,247)		(44,247)		(44,247)
Defined Benefit Plans | Southwest Gas Corporation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, attributable to parent, before tax			(61,182)
Beginning balance, attributable to parent, tax			14,685
Beginning balance, attributable to parent			(46,497)
Other comprehensive income (loss), before tax			2,961
Other comprehensive income (loss), tax			(711)
Total other comprehensive income (loss), net of tax			2,250
Ending balance, attributable to parent, before tax	(58,221)		(58,221)		(58,221)
Ending balance, attributable to parent, tax	13,974		13,974		13,974
Ending balance, attributable to parent	(44,247)		(44,247)		(44,247)
Amortization of prior service cost
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification from AOCI, before Tax	44	240	88	480	567	1,057
Reclassification from AOCI, tax	(11)	(58)	(22)	(116)	(136)	(255)
Reclassification from AOCI, net of tax	33	182	66	364	431	802
Other comprehensive income (loss), before tax			88
Other comprehensive income (loss), tax			(22)
Total other comprehensive income (loss), net of tax			66
Amortization of prior service cost | Southwest Gas Corporation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income (loss), before tax			88
Other comprehensive income (loss), tax			(22)
Total other comprehensive income (loss), net of tax			66
Amortization of net actuarial loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income (loss) before reclassifications, before tax					59,176	(57,539)
Other comprehensive income (loss) before reclassifications, net of tax					44,974	(43,730)
Reclassification from AOCI, before Tax	8,704	11,148	17,409	22,297	39,709	41,212
Reclassification from AOCI, tax	(2,089)	(2,676)	(4,178)	(5,351)	(9,530)	(9,890)
Reclassification from AOCI, net of tax	6,615	8,472	13,231	16,946	30,179	31,322
Other comprehensive income (loss), before tax			17,409
Other comprehensive income (loss), tax			(4,178)
Total other comprehensive income (loss), net of tax			13,231
Amortization of net actuarial loss | Southwest Gas Corporation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income (loss), before tax			17,409
Other comprehensive income (loss), tax			(4,178)
Total other comprehensive income (loss), net of tax			13,231
Regulatory adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification from AOCI, before Tax	(7,268)	(9,575)	(14,536)	(19,150)	(83,580)	5,075
Reclassification from AOCI, tax	1,744	2,298	3,489	4,596	20,060	(1,219)
Reclassification from AOCI, net of tax	(5,524)	(7,277)	(11,047)	(14,554)	(63,520)	3,856
Other comprehensive income (loss), before tax			(14,536)
Other comprehensive income (loss), tax			3,489
Total other comprehensive income (loss), net of tax			(11,047)
Regulatory adjustment | Southwest Gas Corporation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income (loss), before tax			(14,536)
Other comprehensive income (loss), tax			3,489
Total other comprehensive income (loss), net of tax			(11,047)
FSIRS
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, before tax			(545)
Beginning balance, tax			129
Beginning balance			(416)
Reclassification from AOCI, before Tax	0	544	545	1,088	1,631	2,662
Reclassification from AOCI, tax	0	(130)	(129)	(261)	(390)	(639)
Reclassification from AOCI, net of tax	0	414	416	827	1,241	2,023
Other comprehensive income (loss), before tax	0	544	545	1,088	1,631	2,662
Other comprehensive income (loss), tax	0	(130)	(129)	(261)	(390)	(639)
Total other comprehensive income (loss), net of tax	0	414	416	827	1,241	2,023
Ending balance, before tax	0		0		0
Ending balance, tax	0		0		0
Ending balance	0		0		0
FSIRS | Southwest Gas Corporation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, attributable to parent, before tax			(545)
Beginning balance, attributable to parent, tax			129
Beginning balance, attributable to parent			(416)
Reclassification from AOCI, before Tax			545
Reclassification from AOCI, tax			(129)
Reclassification from AOCI, net of tax			416
Other comprehensive income (loss), before tax			545
Other comprehensive income (loss), tax			(129)
Total other comprehensive income (loss), net of tax			416
Ending balance, attributable to parent, before tax	0		0		0
Ending balance, attributable to parent, tax	0		0		0
Ending balance, attributable to parent	0		0		0
Foreign Currency Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, before tax			152
Beginning balance, tax			0
Beginning balance			152
Other comprehensive income (loss) before reclassifications, before tax			(1,433)
Other comprehensive income (loss) before reclassifications, net of tax			(1,433)
Ending balance, before tax	(1,281)		(1,281)		(1,281)
Ending balance, tax	0		0		0
Ending balance	(1,281)		(1,281)		(1,281)
AOCI Including Portion Attributable to Noncontrolling Interest
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income (loss) before reclassifications, net of tax			1,233
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(43,972)	(58,388)	(46,761)	(61,003)	(55,688)
Ending balance	(45,528)	(55,688)	(45,528)	(55,688)	(45,528)	(55,688)
AOCI Attributable to Parent | Southwest Gas Corporation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(45,371)	(59,343)	(46,913)	(61,135)	(57,552)
Beginning balance, attributable to parent			(46,913)
Ending balance	(44,247)	$ (57,552)	(44,247)	$ (57,552)	(44,247)	$ (57,552)
Ending balance, attributable to parent	$ (44,247)		$ (44,247)		$ (44,247)

XML

Other Comprehensive Income and Accumulated Other Comprehensive Income - Amounts Recognized Before Tax, Defined Benefit Plans (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Equity [Abstract]
Net actuarial loss	$ (381,601)	$ (399,010)
Prior service cost	(1,440)	(1,528)
Less: amount recognized in regulatory assets	324,820	339,356
Recognized in AOCI	$ (58,221)	$ (61,182)

XML

Segment Information - Narratives (Details) - segment	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Segment Reporting [Abstract]
Number of reportable segments	3	2

XML

Segment Information - Accounts Receivable Not Eliminated During Consolidation (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Centuri
Segment Reporting Information [Line Items]
Centuri accounts receivable for services provided to Southwest	$ 16,915	$ 15,166

XML

Segment Information - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Total Regulated operations revenues	$ 1,146,120	$ 821,421	$ 2,413,529	$ 1,707,328	$ 4,386,652	$ 3,412,634
Segment net income (loss)	(6,575)	25,119	89,603	142,412	147,970	264,229
Revenues from external customers
Segment Reporting Information [Line Items]
Total Regulated operations revenues	1,112,149	797,737	2,351,225	1,659,441	4,269,889	3,300,013
Intersegment revenues
Segment Reporting Information [Line Items]
Total Regulated operations revenues	33,971	23,684	62,304	47,887	116,763	112,621
Segment net income (loss)	(24,126)	(1,410)	(33,187)	(1,973)	(57,990)	(2,532)
Natural Gas Distribution
Segment Reporting Information [Line Items]
Total Regulated operations revenues	377,942	292,796	1,054,481	814,728	1,761,543	1,400,052
Segment net income (loss)	(2,266)	11,413	109,529	130,128	166,536	193,705
Natural Gas Distribution | Revenues from external customers
Segment Reporting Information [Line Items]
Total Regulated operations revenues	377,942	292,796	1,054,481	814,728	1,761,543	1,400,052
Natural Gas Distribution | Intersegment revenues
Segment Reporting Information [Line Items]
Total Regulated operations revenues	0	0	0	0	0	0
Utility Infrastructure Services
Segment Reporting Information [Line Items]
Total Regulated operations revenues	706,090	528,625	1,229,967	892,600	2,496,028	2,012,582
Segment net income (loss)	4,741	15,116	(18,745)	14,257	7,418	73,056
Utility Infrastructure Services | Revenues from external customers
Segment Reporting Information [Line Items]
Total Regulated operations revenues	672,119	504,941	1,167,663	844,713	2,379,265	1,899,961
Utility Infrastructure Services | Intersegment revenues
Segment Reporting Information [Line Items]
Total Regulated operations revenues	33,971	23,684	62,304	47,887	116,763	112,621
Pipeline and Storage
Segment Reporting Information [Line Items]
Total Regulated operations revenues	62,088	0	129,081	0	129,081	0
Segment net income (loss)	15,076	0	32,006	0	32,006	0
Pipeline and Storage | Revenues from external customers
Segment Reporting Information [Line Items]
Total Regulated operations revenues	62,088	0	129,081	0	129,081	0
Pipeline and Storage | Intersegment revenues
Segment Reporting Information [Line Items]
Total Regulated operations revenues	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0

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Business Acquisitions - Narrative (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Nov. 30, 2021
Business Acquisition [Line Items]
Incurred and expensed acquisition costs	$ 18,500,000	$ 18,500,000
Drum
Business Acquisition [Line Items]
Incurred and expensed acquisition costs	14,000,000	14,000,000
Acquisition-related costs	0	$ 0
Questar Pipelines
Business Acquisition [Line Items]
Acquisition-related costs	$ 0
Certain Members Of Riggs Distler Management | Drum
Business Acquisition [Line Items]
Ownership percentage by noncontrolling owners	1.42%	1.42%	1.42%

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Business Acquisitions - Summary of Assets Acquired and Liabilities Assumed - Drum Acquisition (Detail) - USD ($) $ in Thousands	10 Months Ended
	Jun. 30, 2022	Dec. 31, 2021	Aug. 27, 2021
Fair Values of Assets Acquired and Liabilities Assumed
Goodwill	$ 1,750,472	$ 1,781,332
Drum
Fair Values of Assets Acquired and Liabilities Assumed
Cash and cash equivalents	1,900		$ 1,900
Accounts receivable	60,500		69,100
Contract assets	47,500		40,100
Income taxes receivable, net	700		700
Right of use assets under operating leases	1,500		1,500
Prepaid expenses	5,200		5,200
Property and equipment	119,300		118,100
Intangible assets	303,500		335,000
Goodwill	448,600		446,800
Total assets acquired	988,700		1,018,400
Trade and other payables	46,200		46,200
Finance lease obligations	28,700		27,500
Contract liabilities	12,700		12,700
Operating lease obligations	1,500		1,500
Other liabilities	4,100		5,300
Deferred tax liabilities	71,400		94,800
Total liabilities assumed and noncontrolling interest	164,600		188,000
Net assets acquired	824,100		$ 830,400
Measurement Period Adjustments, Accounts receivable	(8,600)
Measurement Period Adjustments, Contract assets	7,400
Measurement Period Adjustments, Property and equipment	1,200
Measurement Period Adjustments, Intangible assets	(31,500)
Measurement Period Adjustments, Goodwill	1,800
Measurement Period Adjustments, Total assets	(29,700)
Measurement Period Adjustments, Finance lease obligations	1,200
Measurement Period Adjustments, Other liabilities	(1,200)
Measurement Period Adjustments, Deferred tax liabilities	(23,400)
Measurement Period Adjustments, Total liabilities	(23,400)
Measurement Period Adjustments, Net assets acquired	$ (6,300)

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Business Acquisitions - Summary of Assets Acquired and Liabilities Assumed - Questar Acquisition (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Goodwill	$ 1,750,472	$ 1,781,332
Questar Pipelines
Business Acquisition [Line Items]
Gas plant, net	1,047,400	1,047,400
Other property and investments	51,300	51,300
Cash and cash equivalents	17,600	17,600
Accounts receivable	29,500	26,600
Prepaid and other current assets	27,400	27,400
Deferred charges and other assets	31,100	31,100
Goodwill	958,000	986,200
Deferred income taxes, net	36,300	15,400
Total assets acquired	2,198,600	2,203,000
Long-term debt	449,700	449,700
Accounts payable	7,000	7,000
Deferred purchased gas costs	5,700	5,700
Customer deposits	3,200	3,200
Accrued general taxes	400	400
Accrued interest	4,700	4,700
Other current liabilities	14,500	14,500
Accumulated removal costs	56,600	56,600
Other deferred credits	85,600	85,600
Total liabilities assumed and noncontrolling interest	627,400	627,400
Net assets acquired	1,571,200	$ 1,575,600
Measurement Period Adjustments, Accounts receivable, net of allowances	2,900
Measurement Period Adjustments, Goodwill	(28,200)
Measurement Period Adjustments, Deferred income taxes	20,900
Measurement Period Adjustments, Total assets	(4,400)
Measurement Period Adjustments, Net assets acquired	$ (4,400)