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                                  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) October 28, 1999


                            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





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Item 5. Other Events On October 28, 1999, Southwest Gas Corporation (the Company) released summary financial information to the general public, including the investment community, regarding the Company's operating performance and financial position for the quarter ended September 30, 1999. The financial information released is included herein. This information is summary in nature and should not be considered complete financial statements. Item 7. Exhibits 99 Financial Analyst Report - Third Quarter 1999 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: October 28, 1999 /s/ EDWARD A. JANOV ----------------------------- Edward A. Janov Vice President/Controller and Chief Accounting Officer



                                                                                                                         EXHIBIT 99
                            SOUTHWEST GAS CORPORATION
                          SUMMARY STATEMENTS OF INCOME
                    (In thousands, except per share amounts)
                                   (Unaudited)


                                                           THREE MONTHS ENDED        NINE MONTHS ENDED       TWELVE MONTHS ENDED
                                                              SEPTEMBER 30,            SEPTEMBER 30,            SEPTEMBER 30,
                                                         ------------------------  ----------------------- ------------------------
                                                            1999         1998        1999         1998        1999         1998
                                                         -----------  -----------  ----------  ----------- -----------  -----------
                                                                                                      
Gas operating revenues                                   $  125,190   $  128,229   $ 570,979   $  567,609  $  802,967   $  767,961
Net cost of gas sold                                         46,711       51,499     254,436      246,254     338,031      305,762
                                                         -----------  -----------  ----------  ----------- -----------  -----------
Operating margin                                             78,479       76,730     316,543      321,355     464,936      462,199
Operations and maintenance expenses                          54,621       50,765     163,565      153,796     218,941      206,790
Depreciation, amortization, and general taxes                28,992       28,262      87,066       83,055     115,888      109,306
                                                         -----------  -----------  ----------  ----------- -----------  -----------
Operating income (loss)                                      (5,134)      (2,297)     65,912       84,504     130,107      146,103
Net interest deductions                                      15,657       15,467      44,720       46,806      60,198       63,365
Preferred securities distribution                             1,368        1,368       4,106        4,106       5,475        5,475
                                                         -----------  -----------  ----------  ----------- -----------  -----------
Pretax utility income (loss)                                (22,159)     (19,132)     17,086       33,592      64,434       77,263
Utility income tax expense (benefit)                         (8,815)      (7,550)      6,374       12,742      27,096       25,757
                                                         -----------  -----------  ----------  ----------- -----------  -----------
Net utility income (loss)                                   (13,344)     (11,582)     10,712       20,850      37,338       51,506
Other income (expense), net                                  (1,960)        (212)     (3,327)        (213)     (5,760)      (8,062)
                                                         -----------  -----------  ----------  ----------- -----------  -----------
Contribution to net income (loss) - gas operations          (15,304)     (11,794)      7,385       20,637      31,578       43,444
Contribution to net income (loss) - construction services     1,116          849       3,097        1,857       3,947        2,385
                                                         -----------  -----------  ----------  ----------- -----------  -----------
Net income (loss)                                        $  (14,188)  $  (10,945)  $  10,482   $   22,494  $   35,525   $   45,829
                                                         ===========  ===========  ==========  =========== ===========  ===========

Earnings (loss) per share - gas operations               $    (0.50)  $    (0.41)  $    0.24   $     0.74  $     1.03   $     1.56
Earnings per share - construction services                     0.04         0.03        0.10         0.06        0.13         0.09
                                                         -----------  -----------  ----------  ----------- -----------  -----------
Basic earnings (loss) per share                          $    (0.46)  $    (0.38)  $    0.34   $     0.80  $     1.16   $     1.65
                                                         ===========  ===========  ==========  =========== ===========  ===========
Diluted earnings (loss) per share                        $    (0.46)  $    (0.38)  $    0.34   $     0.80  $     1.15   $     1.64
                                                         ===========  ===========  ==========  =========== ===========  ===========

Average outstanding common shares                            30,742       29,050      30,621       28,028      30,550       27,846
Average shares outstanding (assuming dilution)                   --           --      30,902       28,216      30,824       28,022

The summary statements of income have been prepared by Southwest Gas Corporation
(the Company) using the equity method of accounting for its construction
services subsidiary. This presentation is not in accordance with generally
accepted accounting principles (GAAP). However, it produces the same net income
as the consolidated financial statements and, in management's opinion, is a fair
representation of the operations and contributions to net income of the
Company's operating segments.



SOUTHWEST GAS CORPORATION SUMMARY STATEMENTS OF INCOME (In thousands, except per share amounts) (Unaudited) NINE MONTHS ENDED TWELVE MONTHS ENDED SEPTEMBER 30, SEPTEMBER 30, --------------------------------- -------------------------------- 1999 1998 1999 1998 - --------------------------------------------------------------------------------------------------------------------------------- Gas operating revenues $ 570,979 $ 567,609 $ 802,967 $ 767,961 Net cost of gas sold 254,436 246,254 338,031 305,762 - --------------------------------------------------------------------------------------------------------------------------------- Operating margin 316,543 321,355 464,936 462,199 Operations and maintenance expenses 163,565 153,796 218,941 206,790 Depreciation, amortization, and general taxes 87,066 83,055 115,888 109,306 - --------------------------------------------------------------------------------------------------------------------------------- Operating income 65,912 84,504 130,107 146,103 Net interest deductions 44,720 46,806 60,198 63,365 Preferred securities distribution 4,106 4,106 5,475 5,475 - --------------------------------------------------------------------------------------------------------------------------------- Pretax utility income 17,086 33,592 64,434 77,263 Utility income tax expense 6,374 12,742 27,096 25,757 - --------------------------------------------------------------------------------------------------------------------------------- Net utility income 10,712 20,850 37,338 51,506 Other income (expense), net (3,327) (213) (5,760) (8,062) - --------------------------------------------------------------------------------------------------------------------------------- Contribution to net income - gas operations 7,385 20,637 31,578 43,444 Contribution to net income - construction services 3,097 1,857 3,947 2,385 ================================================================================================================================= Net income $ 10,482 $ 22,494 $ 35,525 $ 45,829 ================================================================================================================================= Earnings per share - gas operations $ 0.24 $ 0.74 $ 1.03 $ 1.56 Earnings per share - construction services 0.10 0.06 0.13 0.09 ================================================================================================================================= Basic earnings per share $ 0.34 $ 0.80 $ 1.16 $ 1.65 ================================================================================================================================= Diluted earnings per share $ 0.34 $ 0.80 $ 1.15 $ 1.64 ================================================================================================================================= Average outstanding common shares 30,621 28,028 30,550 27,846 Average shares outstanding (assuming dilution) 30,902 28,216 30,824 28,022 See Notes to Summary Financial Statements.

SOUTHWEST GAS CORPORATION SUMMARY BALANCE SHEET AT SEPTEMBER 30, 1999 (In thousands) (Unaudited) ASSETS UTILITY PLANT Gas plant, net of accumulated depreciation $ 1,502,461 Construction work in progress 43,917 --------------- Net utility plant 1,546,378 --------------- OTHER PROPERTY AND INVESTMENTS Investment in construction services subsidiary 29,718 Other 44,374 --------------- Total other property and investments 74,092 --------------- CURRENT AND ACCRUED ASSETS Cash, working funds and temporary cash investments 5,388 Receivables - less reserve of $1,541 for uncollectibles 31,226 Accrued utility revenue 24,000 Other 35,932 --------------- Total current and accrued assets 96,546 --------------- DEFERRED DEBITS Unamortized debt expense 17,672 Other deferred debits 25,073 --------------- Total deferred debits 42,745 --------------- TOTAL ASSETS $ 1,759,761 =============== CAPITALIZATION AND LIABILITIES CAPITALIZATION Common stockholders' equity Common stock equity, $1 par, 30,799 shares outstanding $ 466,625 Retained earnings 11,093 --------------- Total common stockholders' equity 477,718 35.5 % Preferred securities of Southwest Gas Capital I, 9.125% 60,000 4.5 Long-term debt - NOTE 2 808,781 60.0 --------------- ------------ Total capitalization 1,346,499 100.0 % --------------- ============ CURRENT AND ACCRUED LIABILITIES Notes payable 30,720 Accounts payable 34,372 Customer deposits 26,164 Taxes accrued (including income taxes) 36,075 Deferred purchased gas costs 3,233 Other 55,348 --------------- Total current and accrued liabilities 185,912 --------------- DEFERRED CREDITS Deferred investment tax credits 16,620 Deferred income taxes 160,788 Other 49,942 --------------- Total deferred credits 227,350 --------------- TOTAL CAPITALIZATION AND LIABILITIES $ 1,759,761 =============== See Notes to Summary Financial Statements.

SOUTHWEST GAS CORPORATION SUMMARY STATEMENT OF CASH FLOWS NINE MONTHS ENDED SEPTEMBER 30, 1999 (In thousands) (Unaudited) CASH FLOWS FROM OPERATIONS: Net income $ 10,482 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization 65,480 Change in receivables and payables 46,410 Change in gas cost related balancing items 60,933 Change in accrued taxes 2,374 Change in deferred taxes (18,730) Allowance for funds used during construction (1,503) Other (1,981) ------------- Net cash provided by operating activities 163,465 ------------- CASH FLOWS FROM INVESTING ACTIVITIES: Construction expenditures (150,336) Other 3,772 ------------- Net cash used in investing activities (146,564) ------------- CASH FLOWS FROM FINANCING ACTIVITIES: Net proceeds from stock issuances 9,745 Dividends paid (18,830) Change in notes payable (21,280) Long-term debt issuances, net 5,500 ------------- Net cash used in financing activities (24,865) ------------- Change in cash and temporary cash investments (7,964) Cash at beginning of period 13,352 ------------- Cash at end of period $ 5,388 ============= SUPPLEMENTAL INFORMATION: Interest paid, net of amounts capitalized $ 44,458 Income taxes, net of refunds $ 27,610 See Notes to Summary Financial Statements.

SOUTHWEST GAS CORPORATION NOTES TO SUMMARY FINANCIAL STATEMENTS (In thousands) (Unaudited) NOTE 1 - BASIS OF PRESENTATION: The summary financial statements have been prepared by Southwest Gas Corporation (the Company) using the equity method of accounting for its construction services subsidiary. This presentation is not in accordance with generally accepted accounting principles (GAAP), and certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been omitted. The summary financial statement presentation in this report produces the same net income as the consolidated financial statements and, in management's opinion, is a fair representation of the operations and contributions to net income of the Company's operating segments. NOTE 2 - LONG-TERM DEBT: Revolving credit facility, variable rate Debentures and notes: $ 200,000 Debentures, 9.75% series F, due 2002 100,000 Debentures, 7.50% series, due 2006 75,000 Debentures, 8% series, due 2026 75,000 Medium-term notes, 7.59% series, due 2017 25,000 Medium-term notes, 7.78% series, due 2022 25,000 Medium-term notes, 7.92% series, due 2027 25,000 Medium-term notes, 6.89% series, due 2007 17,500 Medium-term notes, 6.76% series, due 2027 7,500 Medium-term notes, 6.27% series, due 2008 25,000 Industrial development revenue bonds: Variable-rate bonds, Series A, due 2028 - net of funds held in trust 35,356 7.30% 1992 Series A, due 2027 30,000 7.50% 1992 Series B, due 2032 100,000 6.50% 1993 Series A, due 2033 75,000 Unamortized discount on long-term debt (6,575) ------------- TOTAL LONG-TERM DEBT $ 808,781 ============= ESTIMATED CURRENT MATURITIES $ -- =============

SOUTHWEST GAS CORPORATION SELECTED STATISTICAL DATA SEPTEMBER 30, 1999 FINANCIAL STATISTICS Market value to book value per share at quarter end 174% Twelve months to date return on equity -- total company 7.3% -- gas segment 6.8% Common stock dividend yield at quarter end 3.0% GAS OPERATIONS SEGMENT Authorized Authorized Authorized Return on Rate Base Rate of Common Rate Jurisdiction (In thousands) Return Equity - -------------------------------- ----------------- -------------- ---------------- Arizona (1) $ 541,104 9.38 % 11.25 % Southern Nevada (1) 237,165 9.50 11.55 Northern Nevada (1) 63,986 9.67 11.55 Southern California 69,486 9.94 11.35 Northern California 22,255 10.02 11.35 Paiute Pipeline Company (1) 72,054 9.69 11.60 (1) Estimated amounts based on rate case settlements. SYSTEM THROUGHPUT BY CUSTOMER CLASS NINE MONTHS ENDED TWELVE MONTHS ENDED SEPTEMBER 30, SEPTEMBER 30, ---------------------------------- ---------------------------------- (In dekatherms) 1999 1998 1999 1998 - --------------------------------------------------------------------------------------------------------------------------------- Residential 42,517,543 44,893,515 56,318,193 58,021,097 Small commercial 19,988,237 20,332,720 26,649,200 26,703,795 Large commercial 4,995,617 6,116,845 6,811,334 7,819,232 Industrial / Other 11,637,753 13,206,848 15,136,892 15,842,753 Transportation 88,181,939 73,183,218 115,135,917 95,983,545 - --------------------------------------------------------------------------------------------------------------------------------- Total system throughput 167,321,089 157,733,146 220,051,536 204,370,422 ================================================================================================================================= HEATING DEGREE DAY COMPARISON - --------------------------------------------------------------------------------------------------------------------------------- Actual 1,472 1,740 2,044 2,352 Ten-year average 1,450 1,444 2,040 2,033 =================================================================================================================================