8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported) May 2, 2008

SOUTHWEST GAS CORPORATION

(Exact name of registrant as specified in its charter)

California	1-7850	88-0085720
(State or other jurisdiction of	(Commission	(I.R.S. Employer
incorporation or organization)	File Number)	Identification No.)
5241 Spring Mountain Road
Post Office Box 98510
Las Vegas, Nevada		89193-8510
(Address of principal executive offices)		(Zip Code)

Registrant's telephone number, including area code: (702) 876-7237

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

[ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

[ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 2.02                                Results of Operations and Financial Condition.

On May 2, 2008, Southwest Gas Corporation (the Company) released summary financial information to the general public, including the investment community, regarding the Company’s operating performance for the quarter and twelve months ended March 31, 2008. A copy of the Company’s press release and summary financial information is attached hereto as Exhibit 99.

This Form 8-K and the attached exhibit are provided under Item 2.02 of Form 8-K and are furnished to, but not filed with, the Securities and Exchange Commission.

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 hereunto duly authorized.

	SOUTHWEST GAS CORPORATION
Date: May 2, 2008
	/s/ ROY R. CENTRELLA
	Roy R. Centrella
	Vice President/Controller and
	Chief Accounting Officer

EXHIBIT INDEX

Exhibit
No.	Description
99	Press Release and summary financial information dated May 2, 2008.

EX-99

May 2, 2008

Media Contact:  Cynthia Messina, Las Vegas, NV (702) 876-7132

Shareholder Contact:  Ken Kenny, Las Vegas, NV (702) 876-7237

For Immediate Release

SOUTHWEST GAS CORPORATION

ANNOUNCES FIRST QUARTER 2008 EARNINGS

Las Vegas, Nev. – Southwest Gas Corporation (SWX – NYSE) announced consolidated earnings of $1.14 per basic share for the first quarter of 2008, a $0.05 decrease from the $1.19 per basic share earned during the first quarter of 2007.  Consolidated net income was $49.2 million, compared to $49.8 million in the prior-year quarter.

According to Jeffrey W. Shaw, Chief Executive Officer, “Our natural gas operations segment recorded solid operating results in the first quarter of 2008.  Cooler temperatures provided additional operating margin, while operating expense increases were minimized.  Customer growth continued to be affected by a sluggish new construction housing market as the inventory of unoccupied homes remained high in our service territories.  Also, our construction services segment experienced a small loss during the first quarter due to unfavorable winter weather conditions and the continued slow down in the housing market.  We believe this phenomenon is temporary and that construction results will improve as we move through the warmer weather seasons and the housing construction market stabilizes.”  Shaw closed with a discussion of the Company’s ongoing rate case proceedings in Arizona and California indicating “The cases remain on track, with hearings in each jurisdiction scheduled to be

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held this summer.  We remain cautiously optimistic that fair outcomes will be achieved before the winter heating season in Arizona, and by year end in California.”

For the twelve months ended March 31, 2008, consolidated net income was $82.6 million, or $1.94 per basic share, compared to $89.4 million, or $2.17 per basic share, during the twelve-month period ended March 31, 2007.  The prior twelve-month results included approximately $0.07 per share related to a nonrecurring property tax benefit recognized in the second quarter of 2006.

Natural Gas Operations Segment Results

First Quarter

Operating margin, defined as operating revenues less the cost of gas sold, increased approximately $8 million, or three percent, in the first quarter of 2008 compared to the first quarter of 2007.  Differences in heating demand, caused primarily by weather variations, accounted for $5 million of the increase in operating margin as overall temperatures in the first half of the current quarter were somewhat colder compared to the more normal levels experienced in the first quarter of 2007.  Rate relief added $1 million and customer growth contributed $2 million toward the operating margin increase as the Company added 20,000 customers during the last twelve months, an increase of one percent.

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Operating expenses for the quarter increased $2.5 million, or two percent, compared to the first quarter of 2007 primarily due to general cost increases, higher uncollectible expenses, and incremental operating costs associated with serving additional customers.  Labor efficiencies, primarily from the ongoing electronic meter reading project, mitigated the increase in operating expenses.  Other income decreased $2.9 million primarily due to negative returns on long-term investments and lower interest income on declining deferred purchased gas adjustment (PGA) receivable balances.  Net financing costs were relatively flat between periods.

Twelve Months to Date

Operating margin increased $21 million, or three percent, between periods.  Rate changes accounted for $11 million of the increase and customer growth contributed $10 million.  Warmer-than-normal temperatures were experienced during both twelve-month periods (each with estimated negative impacts to operating margin of approximately $7 million), resulting in no incremental impact between the periods.

Operating expenses increased $16.9 million, or three percent, between periods primarily due to general increases in labor and maintenance costs, higher uncollectible expenses, and incremental operating costs associated with serving additional customers, partially offset by labor efficiencies primarily from the ongoing electronic meter reading project.  The prior twelve-month period included a nonrecurring property tax benefit.

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Other income decreased $6.5 million primarily due to negative returns on long-term investments and lower interest income on declining deferred PGA balance receivables.In addition, other income for the prior-year period included approximately $1 million of interest income related to the property tax benefit.  Net financing costs between periods increased $1.9 million, or two percent, primarily due to interest expense associated with higher deferred PGA balance payables and higher rates on variable-rate debt.

Southwest Gas Corporation provides natural gas service to 1,819,000 customers in Arizona, Nevada, and California.

This press release may contain statements which constitute "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995 (Reform Act).  All such 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, the impact of weather variations on customer usage, customer growth rates, conditions in the housing market, the effects of regulation/deregulation, the timing and amount of rate relief, and changes in rate design.

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SOUTHWEST GAS CONSOLIDATED EARNINGS DIGEST

(In thousands, except per share amounts)

QUARTER ENDED MARCH 31,	2008		2007
Consolidated Operating Revenues	$	813,607	$	793,716
Net Income	$	49,152	$	49,764
Average Number of Common Shares Outstanding		43,012		41,979
Basic Earnings Per Share	$	1.14	$	1.19
Diluted Earnings Per Share	$	1.14	$	1.17
TWELVE MONTHS ENDED MARCH 31,	2008		2007
Consolidated Operating Revenues	$	2,171,979	$	2,141,533
Net Income	$	82,634	$	89,444
Average Number of Common Shares Outstanding		42,592		41,179
Basic Earnings Per Share	$	1.94	$	2.17
Diluted Earnings Per Share	$	1.92	$	2.15

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SOUTHWEST GAS CORPORATION
SUMMARY UNAUDITED OPERATING RESULTS
(In thousands, except per share amounts)
	THREE MONTHS ENDED					TWELVE MONTHS ENDED
	MARCH 31,					MARCH 31,
	2008			2007		2008		2007
Results of Consolidated Operations
Contribution to net income - gas operations	$	49,333		$	48,628	$	73,199	$	78,024
Contribution to net income - construction services		(181	)		1,136		9,435		11,420
Net income	$	49,152		$	49,764	$	82,634	$	89,444
Earnings per share - gas operations	$	1.15		$	1.16	$	1.72	$	1.89
Earnings (loss) per share - construction services		(0.01	)		0.03		0.22		0.28
Basic earnings per share	$	1.14		$	1.19	$	1.94	$	2.17
Diluted earnings per share	$	1.14		$	1.17	$	1.92	$	2.15
Average outstanding common shares		43,012			41,979		42,592		41,179
Average shares outstanding (assuming dilution)		43,290			42,376		42,940		41,599
Results of Natural Gas Operations
Gas operating revenues	$	741,300		$	727,015	$	1,829,051	$	1,846,267
Net cost of gas sold		500,699			494,211		1,092,682		1,130,702
Operating margin		240,601			232,804		736,369		715,565
Operations and maintenance expense		85,206			84,535		331,879		326,951
Depreciation and amortization		40,645			38,530		159,205		149,631
Taxes other than income taxes		10,194			10,467		37,280		34,844
Operating income		104,556			99,272		208,005		204,139
Other income (expense)		(1,526	)		1,376		1,948		8,473
Net interest deductions		21,352			21,148		86,640		84,760
Net interest deductions on subordinated debentures		1,932			1,931		7,728		7,724
Income before income taxes		79,746			77,569		115,585		120,128
Income tax expense		30,413			28,941		42,386		42,104
Contribution to net income - gas operations	$	49,333		$	48,628	$	73,199	$	78,024

SOUTHWEST GAS CORPORATION
SELECTED STATISTICAL DATA
MARCH 31, 2008
FINANCIAL STATISTICS
Market value to book value per share at quarter end		117	%
Twelve months to date return on equity  -- total company		8.5	%
-- gas segment		8.0	%
Common stock dividend yield at quarter end		3.2	%
GAS OPERATIONS SEGMENT
							Authorized
	Authorized			Authorized			Return on
	Rate Base			Rate of			Common
Rate Jurisdiction	(In thousands)			Return			Equity
Arizona	$	922,721			8.40	%		9.50	%
Southern Nevada		574,285			7.64			10.50
Northern Nevada		110,309			8.56			10.50
Southern California		102,703			8.74			10.38
Northern California		45,487			8.74			10.38
Paiute Pipeline Company (1)		82,853			9.44			11.80
(1) Estimated amounts based on rate case settlements.
SYSTEM THROUGHPUT BY CUSTOMER CLASS
	THREE MONTHS ENDED						TWELVE MONTHS ENDED
	MARCH 31,						MARCH 31,
(In dekatherms)	2008			2007			2008			2007
Residential		37,718,128			36,166,497			71,357,953			72,855,183
Small commercial		12,745,923			12,252,559			31,559,927			31,783,616
Large commercial		4,148,658			4,073,069			12,831,661			13,222,739
Industrial / Other		2,908,310			3,277,681			9,983,129			15,303,206
Transportation		26,653,871			26,640,967			112,855,112			117,546,127
Total system throughput		84,174,890			82,410,773			238,587,782			250,710,871
HEATING DEGREE DAY COMPARISON
Actual		1,209			1,156			1,903			1,955
Ten-year average		1,095			1,103			1,926			1,956
Heating degree days for prior periods have been recalculated using the current period customer mix.