SOUTHWEST GAS CORP
DEF 14A, 1995-04-05
NATURAL GAS TRANSMISISON & DISTRIBUTION
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<PAGE>   1
 
                            SCHEDULE 14A INFORMATION
 
          PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES
                    EXCHANGE ACT OF 1934 (AMENDMENT NO.   )
 
Filed by the Registrant /X/
 
Filed by a Party other than the Registrant / /
 
Check the appropriate box:
 
<TABLE>
<S>                                             <C>
/ /  Preliminary Proxy Statement                / /  Confidential, for Use of the Commission
                                                     Only (as permitted by Rule 14a-6(e)(2))
/X/  Definitive Proxy Statement
/ /  Definitive Additional Materials
/ /  Soliciting Material Pursuant to sec.240.14a-11(c) or sec.240.14a-12
</TABLE>
 
                           SOUTHWEST GAS CORPORATION
- --------------------------------------------------------------------------------
                (Name of Registrant as Specified In Its Charter)
 
- --------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)
 
Payment of Filing Fee (Check the appropriate box):
 
/X/  $125 per Exchange Act Rules 0-11(c)(1)(ii), or 14a-6(i)(1), or 14a-6(i)(2)
     or Item 22(a)(2) of Schedule 14A.
 
/ /  $500 per each party to the controversy pursuant to Exchange Act Rule
     14a-6(i)(3).
 
/ /  Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.
 
     (1)  Title of each class of securities to which transaction applies:
 
     (2)  Aggregate number of securities to which transaction applies:
 
     (3)  Per unit price or other underlying value of transaction computed
          pursuant to Exchange Act Rule 0-11 (Set forth the amount on which the
          filing fee is calculated and state how it was determined):
 
     (4)  Proposed maximum aggregate value of transaction:
 
     (5)  Total fee paid:
 
/ /  Fee paid previously with preliminary materials.
 
/ /  Check box if any part of the fee is offset as provided by Exchange Act Rule
     0-11(a)(2) and identify the filing for which the offsetting fee was paid
     previously. Identify the previous filing by registration statement number,
     or the Form or Schedule and the date of its filing.
 
     (1)  Amount Previously Paid:
 
     (2)  Form, Schedule or Registration Statement No.:
 
     (3)  Filing Party:
 
     (4)  Date Filed:
<PAGE>   2
                       [SOUTHWEST GAS CORPORATION LOGO]
 
   5241 SPRING MOUNTAIN ROAD - P.O. BOX 98510 - LAS VEGAS, NEVADA 89193-8510
 
                    NOTICE OF ANNUAL MEETING OF SHAREHOLDERS
 
                       TO BE HELD THURSDAY, MAY 11, 1995
 
     NOTICE IS HEREBY GIVEN that the annual meeting of shareholders of Southwest
Gas Corporation ("Company") will be held on Thursday, May 11, 1995, at 10:00
a.m. in the auditorium of the Company's Headquarters office building, 5241
Spring Mountain Road, Las Vegas, Nevada, for the following purposes:
 
        (1) To elect 11 directors of the Company;
 
        (2) To consider the continued retention of Arthur Andersen LLP as
            independent public accountants; and
 
        (3) To transact such other business as may properly come before the
            meeting or any adjournment thereof.
 
     The Board of Directors has established Tuesday, March 14, 1995, as the
record date for the determination of shareholders entitled to vote at the annual
meeting and to receive notice thereof. Only holders of the Company's Common
Stock are entitled to vote at the meeting.
 
     Shareholders are cordially invited to attend the meeting in person. WHETHER
OR NOT YOU EXPECT TO ATTEND THE MEETING, PLEASE COMPLETE, DATE AND SIGN THE
ACCOMPANYING PROXY AND RETURN IT PROMPTLY IN THE ENCLOSED POSTAGE PAID ENVELOPE.
 
     Copies of the Summary Annual Report to Shareholders and Form 10-K Annual
Report for the year ended December 31, 1994 are enclosed.
 


                                                          [SIG]

                                                    Thomas J. Trimble
                                          Senior Vice President/General Counsel
                                                 and Corporate Secretary
 
March 31, 1995
<PAGE>   3

[SOUTHWEST GAS CORPORATION LOGO]
 
Michael O. Maffie, President and CEO
 
                                                                  March 31, 1995
 
Dear Shareholder:
 
     You are cordially invited to the Annual Meeting of Shareholders of
Southwest Gas Corporation scheduled to be held on Thursday, May 11, 1995, in the
auditorium of the Company's Headquarters office building, 5241 Spring Mountain
Road, Las Vegas, Nevada, commencing at 10:00 a.m. Your Board of Directors looks
forward to greeting personally those shareholders able to attend.
 
     It is important that your shares are represented and voted at the meeting
regardless of the number of shares you own and whether or not you plan to
attend. Accordingly, we request you to sign, date and mail the enclosed proxy at
your earliest convenience.
 
     Your interest and participation in the affairs of the Company are sincerely
appreciated.
 
                                          Sincerely,

                                           [SIG]

                                           MICHAEL O. MAFFIE

<PAGE>   4
 
                                LOCATION OF 1995
                         ANNUAL MEETING OF SHAREHOLDERS
 
                           5241 SPRING MOUNTAIN ROAD
 
                           *SHAREHOLDER PARKING WILL
                          BE IN THE WEST PARKING LOT.
                          ATTENDANTS WILL BE AVAILABLE
                             TO PROVIDE ASSISTANCE.
 









                                     (MAP)
<PAGE>   5
 
                           SOUTHWEST GAS CORPORATION
   5241 SPRING MOUNTAIN ROAD - P.O. BOX 98510 - LAS VEGAS, NEVADA 89193-8510
 
                                PROXY STATEMENT
 
                                 MARCH 31, 1995
 
     This Statement is furnished in connection with the solicitation by the
Board of Directors of the Company of proxies representing Common Stock to be
voted at the annual meeting of shareholders of the Company to be held on May 11,
1995 and at any adjournment thereof. This proxy statement and accompanying proxy
card are being mailed to shareholders on or about March 31, 1995.
 
     A form of proxy is enclosed for your use. The Company will acknowledge
revocation of any proxy upon request of the record holder made in person or in
writing prior to the exercise of the proxy, or upon receipt of a valid proxy
bearing a later date. Delivery of said revocation or valid proxy bearing a later
date shall be made upon the Corporate Secretary of the Company. If a shareholder
executes two or more proxies with respect to the same shares, the proxy bearing
the most recent date will be honored if otherwise valid. All shares represented
by valid proxies received pursuant to this solicitation will be voted at the
annual meeting. Where a shareholder specifies by means of the proxy a choice
with respect to any matter to be acted upon, his shares will be voted in
accordance with each specification so made.
 
     The entire cost of soliciting proxies will be paid by the Company. In
following up the original mail solicitation of proxies, the Company will make
arrangements with brokerage houses and other custodians, nominees and
fiduciaries to send proxies and proxy material to the beneficial owners of the
shares and will reimburse them for their expenses in so doing. Under an
agreement with the Company, Beacon Hill Partners, New York, New York, will
assist in obtaining proxies from certain larger and other shareholders at an
estimated cost of $3,000 plus certain expenses.
 
     The total number of shares of Common Stock outstanding at March 14, 1995,
the record date for the determination of shareholders entitled to notice of and
to vote at the annual meeting, was 21,507,175. Only holders of Common Stock on
the record date are entitled to notice of and to vote at the annual meeting of
shareholders. The Company will appoint one or three employees to function as
inspectors of election in advance of the meeting to tabulate votes, to ascertain
whether a quorum is present and to determine the voting results on all matters
presented to shareholders. A simple majority of all shares of Common Stock
entitled to vote, represented in person or by proxy, constitutes a quorum. The
affirmative vote of a simple majority of the shares represented and voting at a
duly held meeting (which shares voting affirmatively also constitutes at least a
majority of the required quorum) are necessary for the election of each nominee
for director. Abstentions and broker non-votes are each included in the
determination of the number of shares present; however, they are not counted for
the purpose of determining the election of each nominee for director.
 
     Each share of Common Stock is entitled to one vote. Shareholders have
cumulative voting rights with respect to the election of directors, if certain
conditions are met. Any shareholder otherwise entitled to vote may cumulate his
votes if, prior to the voting, he has given notice, either in person at the
meeting, or by proxy, that he intends to cumulate his votes. A shareholder
electing to cumulate his votes may cast as many votes as there are directors to
be elected, multiplied by the number of shares of Common Stock standing in his
name on the books of the Company at the close of business on the record date. He
may cast all of his votes for one candidate or allocate them among two or more
candidates in any manner he chooses. If any one shareholder has given such
notice, all shareholders may cumulate their votes for candidates in nomination.
 
     The persons named in the proxies solicited by the Board of Directors,
unless otherwise instructed, intend to vote the shares represented by them
equally for each of the 11 candidates for the office of director named in this
Proxy Statement; HOWEVER, if sufficient numbers of shareholders exercise
cumulative voting rights to elect one or more other candidates, the management
 
                                        1
<PAGE>   6
 
proxies will (1) determine the number of directors they are entitled to elect,
(2) select such number from among the named candidates, choosing those having
the greatest number of other votes after taking into consideration all "Withhold
Authority" instructions, (3) cumulate their votes, and (4) cast their votes for
each candidate among the number they are entitled to elect in such manner that
each shall receive, as nearly as possible, the same number of votes.
 
                             ELECTION OF DIRECTORS
                           (ITEM 1 ON THE PROXY CARD)
 
NAMES AND QUALIFICATIONS OF NOMINEES
 
     Each director elected at the annual meeting of shareholders will serve
until the next annual meeting (normally held on the second Thursday of May) and
until his or her successor shall be elected and qualified. The 11 nominees were
elected to their present term of office at the last annual meeting of
shareholders on May 12, 1994.
 
     The names of the nominees for election to the Board of Directors, the
principal occupation of each nominee and his or her employer for the last five
years or longer, and the principal business of the corporation or other
organization, if any, in which such occupation or employment is carried on,
follow.
 
RALPH C. BATASTINI
Former President, Vice Chairman and Chief Financial Officer
The Dial Corp (Formerly The Greyhound Corporation)
 
Director Since: 1992
Board Committees: Audit (Chairman), Pension Plan Investment
 
     Mr. Batastini, 65, received his undergraduate degree from Illinois State
University and his M.B.A. degree in finance from the University of Chicago. He
joined The Greyhound Corporation in 1957 and retired in 1984 as vice chairman
and chief financial officer. At the time of his retirement Mr. Batastini headed
Greyhound's financial group of companies involved in capital equipment leasing,
computer leasing, reinsurance, money orders, mortgage insurance and real estate.
He subsequently served as president of Batastini & Co. from 1985 to 1990. He
currently is the president of the Barrow Neurological Foundation and has been a
director of PriMerit Bank since 1992.
- --------------------------------------------------------------------------------
 
MANUEL J. CORTEZ
President and Chief Executive Officer
Las Vegas Convention and Visitors Authority
 
Director Since: 1991
Board Committees: Nominating and Compensation, Pension Plan Investment
 
     Mr. Cortez, 56, served four terms (1977-1990) on the Clark County
Commission and is a former chairman of the Commission. He has been active on
various boards, including the Environmental Quality Policy Review Board, the Las
Vegas Valley Water District Board of Directors, the University Medical Center
Board of Trustees and served as chairman of the Liquor and Gaming Licensing
Board and the Clark County Sanitation District. He has also held leadership
roles with numerous civic and charitable organizations such as Boys and Girls
Clubs of Clark County, Lied Discovery Childrens Museum and Boys Town. Currently,
Mr. Cortez holds professional memberships in the American Society of Association
Executives, the Professional Convention Managers Association, the International
Association of Convention and Visitors Bureaus and the American Society of
Travel Agents. He has been a director of PriMerit Bank since 1991.
 
                                        2
<PAGE>   7
 
LLOYD T. DYER
Retired President and Chief Executive Officer
Harrah's
 
Director Since: 1978
Board Committees: Executive, Nominating and Compensation
 
     Mr. Dyer, 67, obtained a degree in banking and finance from the University
of Utah prior to his employment with Harrah's, a hotel/gaming corporation with
its principal facilities in Reno and Lake Tahoe, in 1957. He was elected
president and chief operating officer of Harrah's in 1975, and elected president
and chief executive officer in 1978. He remained in those positions with
Harrah's until his retirement in April 1980. Mr. Dyer has been a director of
PriMerit Bank since 1986. He is also a trustee of the William F. Harrah estate.
- --------------------------------------------------------------------------------
 
KENNY C. GUINN
Chairman of the Board
Southwest Gas Corporation and PriMerit Bank
 
Director Since: 1981
Board Committees: Executive (Chairman), Nominating and Compensation
 
     Mr. Guinn, 58, was appointed President and Chief Operating Officer of
Southwest Gas Corporation in 1987, Chairman and Chief Executive Officer in 1988
and was elected Chairman of the Board of Directors in 1993. Mr. Guinn is
actively involved in numerous business, charitable and civic activities. He is
past chairman of the Las Vegas Metropolitan Police Fiscal Affairs Committee and
past chairman of the Board of Trustees for the University of Nevada Las Vegas
Foundation. In May 1994 he was appointed Interim President of the University of
Nevada, Las Vegas and will serve in this capacity for approximately one year. He
is also a director for Oasis Residential, Inc., Boyd Gaming Corporation and Del
Webb Corporation. Mr. Guinn was elected a director of PriMerit Bank in 1980 and
has served as chairman of the board of directors of PriMerit since 1987.
- --------------------------------------------------------------------------------
 
THOMAS Y. HARTLEY
President and Chief Operating Officer
Colbert Golf Design and Development, Inc.
 
Director Since: 1991
Board Committees: Audit, Nominating and Compensation
 
     Mr. Hartley, 61, obtained his degree in business from Ohio University in
1955, and was employed in various capacities by Deloitte Haskins & Sells from
1959 until his retirement as an area managing partner in 1988. Mr. Hartley is
actively involved in numerous business and civic activities. He is chairman of
the University of Nevada Las Vegas Foundation and president of the Las Vegas
Founders Club. He has also held executive positions with the Nevada Development
Authority, the Las Vegas Founders Golf Foundation, the Las Vegas Chamber of
Commerce and the Boulder Dam Area Council of the Boy Scouts of America. He is a
director of Rio Hotel and Casino, Inc., Sierra Health Services, Inc. and has
been a director of PriMerit Bank since 1991.
 
                                        3
<PAGE>   8
 
MICHAEL B. JAGER
Private Investor
Director Since: 1989
 
Board Committees: Audit, Pension Plan Investment
 
     Mr. Jager, 63, obtained a degree in petroleum geology from Stanford
University in 1955. After a four-year employment with the Richfield Oil
Corporation as a petroleum geologist, he joined the Frank H. Ayres & Son
Construction Company and was involved in the construction of subdivisions and
homes in southern California until 1979. Since that time he has consulted in the
single family residential development industry, and owns and manages a number of
businesses in Oregon and Nevada. He has been a director of PriMerit Bank since
1989.
- --------------------------------------------------------------------------------
 
LEONARD R. JUDD
Former President, Chief Operating Officer and Director
Phelps Dodge Corporation
 
Director Since: 1988
Board Committees: Audit, Nominating and Compensation (Chairman)
 
     Mr. Judd, 56, former president, chief operating officer and director of
Phelps Dodge Corporation, joined Phelps Dodge in 1963 and worked at that
company's operations in Arizona, New Mexico and New York City. He was elected to
the Phelps Dodge board of directors in 1987, president of Phelps Dodge Mining
Company in 1988 and became president and chief operating officer of Phelps Dodge
in 1989. He remained in those positions until November, 1991. Mr. Judd is a
member of various professional organizations and is active in numerous civic
groups. He serves as a director of the Kasler Holding Company, the Montana
College of Mineral Science and Technology Foundation, and has been a director of
PriMerit Bank since 1988.
- --------------------------------------------------------------------------------
 
JAMES R. LINCICOME
Retired Executive Vice President and General Manager
Government Electronics Group, Motorola Corporation
 
Director Since: 1987
Board Committees: Audit, Executive, Nominating and Compensation
 
     Mr. Lincicome, 69, was employed by Motorola in its Communications Division
in 1950. After progressing through positions in that Division, he transferred to
the Government Electronics Group, where from 1979 until his retirement in 1987,
he was General Manager responsible for various national defense, space
exploration and other government related programs. Mr. Lincicome is a member of
various professional organizations and is past Chairman of the Arizona State
University Engineering Advisory Council, Junior Achievement of Central Arizona,
the Phoenix Urban League, United for Arizona and the Valley of the Sun United
Way. He has held a number of leadership roles in other civic and charitable
organizations in Arizona, including the Research Committee of the Arizona Town
Hall and Board Member of the Goldwater Institute, and was vice chairman of the
Government Division of the Electronic Industries Association in 1986. He is a
director of Atherton Technology and has been a director of PriMerit Bank since
1988.
 
                                        4
<PAGE>   9
 
MICHAEL O. MAFFIE
President and Chief Executive Officer
Southwest Gas Corporation
 
Director Since: 1988
Board Committees: Executive
 
     Mr. Maffie, 47, joined the company in 1978 as Treasurer after seven years
with Arthur Andersen & Co. He was named Vice President/Finance and Treasurer in
1982, Senior Vice President and Chief Financial Officer in 1984, Executive Vice
President in 1987, President and Chief Operating Officer in 1988 and President
and Chief Executive Officer in 1993. He has been a director of PriMerit Bank
since 1993. A graduate of the University of Southern California, he is a member
of various professional organizations, a board member of United Way of Nevada,
Nevada School of the Arts, Boys and Girls Clubs of Las Vegas and trustee of the
Las Vegas Symphony and the University of Nevada Las Vegas Foundation. He is a
director of the Pacific Coast Gas Association.
- --------------------------------------------------------------------------------
 
CAROLYN M. SPARKS
Co-Founder
International Insurance Services, Ltd.
 
Director Since: 1988
Board Committees: Audit, Pension Plan Investment (Chairman)
 
     Mrs. Sparks, 53, graduated from the University of California at Berkeley in
1963, and with her husband, co-founded International Insurance Services, Ltd. in
Las Vegas in 1966. She has served on the University and Community College System
of Nevada Board of Regents since 1984, and in 1991 was elected to a two-year
term as Chairperson of the Board of Regents. Mrs. Sparks is actively involved
with numerous charitable and civic organizations, including founding chairperson
of the University Medical Center Foundation and the Children's Miracle Network
Telethon. She also serves on the boards for Bishop Gorman High School and the
Las Vegas Center for Children. She is a director of Showboat, Inc., a
hotel/gaming corporation, and has been a director of PriMerit Bank since 1988.
- --------------------------------------------------------------------------------
 
ROBERT S. SUNDT
Retired President
SundtCorp
 
Director Since: 1987
Board Committees: Executive, Pension Plan Investment
 
     Mr. Sundt, 68, has been associated with SundtCorp in a variety of positions
since 1948. He was named President of SundtCorp in 1983. He is now retired and
has no continuing association with SundtCorp. He has been a director of PriMerit
Bank since 1988. He is a member of the American Institute of Constructors,
Consulting Constructors Council of America and a life director of the Associated
General Contractors of America. He is a member of the American Arbitration
Association and serves as an arbitrator on disputes concerning the construction
industry. He is past member of the Construction Industry Presidents Forum. Mr.
Sundt is affiliated with a number of community organizations and is past
chairman of the Tucson Metropolitan Chamber of Commerce.
 
                                        5
<PAGE>   10
 
SECURITIES OWNERSHIP BY NOMINEES AND EXECUTIVE OFFICERS
 
     The following table discloses all Common Stock of the Company beneficially
owned by the nominees for Directors and the executive officers of the Company,
as of March 14, 1995.
 
<TABLE>
<CAPTION>
                                                                       NO. OF
                                                                       SHARES
                                                                     BENEFICIALLY
                            NOMINEE/EXECUTIVE OFFICER                OWNED(1)(2)
            --------------------------------------------------------------------
            <S>                                                       <C>
            Ralph C. Batastini                                          5,549
            Manuel J. Cortez                                            1,152
            Lloyd T. Dyer                                               3,935
            Kenny C. Guinn                                             54,332(3)
            Thomas Y. Hartley                                           7,578
            Michael B. Jager                                            4,818(4)
            Leonard R. Judd                                             2,000
            James R. Lincicome                                          2,000
            Michael O. Maffie                                          22,063(3)
            Carolyn M. Sparks                                           2,276
            Robert S. Sundt                                             4,500
            George C. Biehl                                            11,255(3)
            Dan J. Cheever                                              3,290
            L. Keith Stewart                                            3,465
            Thomas J. Trimble                                           7,154
            Other Executive Officers                                   14,968
</TABLE>
 
- ---------------
 
(1) As of March 14, 1995, the nominees and executive officers of the Company
    beneficially owned 150,335 shares, which represents less than 1% of the
    outstanding shares of the Company's Common Stock. No nominee or named
    executive officer owns any shares of the Company's outstanding Preferred
    Stock. No investor owned more than 5 percent of the outstanding voting stock
    of the Company as of March 1, 1995.
 
(2) The Common Stock holdings listed in this column include performance shares
    granted to the Company's executive officers under the Company's Management
    Incentive Plan for 1993 and 1994.
 
(3) Number of shares does not include 6,618 shares held by the Southwest Gas
    Corporation Foundation, which is a charitable trust. Messrs. Guinn, Maffie,
    and Biehl are trustees of the Foundation but disclaim beneficial ownership
    of said shares.
 
(4) Number of shares includes 3,000 shares held in trust for Margaret Jager,
    over which Mr. Jager has no control.
- ---------------
 
     The Company has adopted procedures to assist its directors and executive
officers in complying with Section 16(a) of the Securities and Exchange Act of
1934, which includes assisting in the preparation of forms for filing. For 1994,
all the required reports were filed timely. In addition, amended Form 5's for
1992 and 1993 were filed for Lloyd T. Dyer to reflect dividend reinvestment plan
holdings that, through an oversight, were omitted from the original Form 5
filings.
 
                                        6
<PAGE>   11
 
                  SELECTION OF INDEPENDENT PUBLIC ACCOUNTANTS
                           (ITEM 2 ON THE PROXY CARD)
 
     The Board of Directors has selected Arthur Andersen LLP as independent
public accountants for the Company for the year ending December 31, 1995,
subject to ratification by the shareholders. Arthur Andersen LLP has served as
independent public accountants for the Company since 1957. To the knowledge of
the Company, at no time has Arthur Andersen LLP had any direct or indirect
financial interest in or any connection with the Company or any of its
subsidiaries other than in connection with services rendered to the Company as
described below.
 
     The selection of Arthur Andersen LLP by the Board of Directors was based on
the recommendation of the Audit Committee, which is composed wholly of outside
directors. The Audit Committee meets periodically with the Company's internal
auditors and independent public accountants to review the scope and results of
the audit function and the policies relating to auditing procedures. In making
its annual recommendation, the Audit Committee reviews both the audit scope and
estimated fees for the coming year. If the shareholders do not ratify this
appointment, other firms of certified public accountants will be considered by
the Board of Directors upon recommendation of the Audit Committee.
 
     During 1994 the Company or PriMerit Bank, the Company's financial services
subsidiary, paid Arthur Andersen LLP for (1) the examination of the annual
financial statements, (2) reviews of unaudited quarterly financial information,
(3) assistance and consultation in connection with preparing various Securities
and Exchange Commission ("SEC") filings, (4) the examination of the annual
financial statements of the Company's employee benefit plans, (5) consultation
in connection with various tax and accounting matters, and (6) certain other
professional services.
 
     The Audit Committee approved the audit and other professional services and
considered the costs of all such services and what effect, if any, performance
of the other professional services might have on the independence of the
accountants.
 
     Representatives of Arthur Andersen LLP will be present at the annual
meeting of shareholders. They will have the opportunity to make statements, if
they are so inclined, and will be available to respond to appropriate questions.
 
                              GENERAL INFORMATION
 
BOARD OF DIRECTORS
 
     The Board of Directors is responsible for the overall affairs of the
Company and for establishing broad corporate policies.
 
     Regular meetings of the Board of Directors are scheduled for the third
Tuesdays of January, July, September and November, the first Tuesday of March
and the second Wednesday of May. An organizational meeting is also held
immediately following the Annual Meeting of Shareholders. The Board of Directors
held five regular meetings, one special meeting and one organizational meeting
in 1994. The Board of Directors also held eight regular meetings as directors
for PriMerit Bank, the Company's financial services subsidiary. Each director
attended more than 75 percent of the meetings of the Board of Directors and
standing committees on which he or she served during 1994.
 
DIRECTORS COMPENSATION
 
     Outside directors receive an annual retainer of $20,000, plus $900 for each
Board or committee meeting attended. Committee chairpersons receive an
additional $500 for each committee meeting attended. The outside directors also
receive an annual retainer of $16,000 and fees for serving on the Board of
Directors for PriMerit Bank. Each director receives a fee of $700 for each Bank
Board or committee meeting attended, and the Bank committee chairpersons also
receive an additional
 
                                        7
<PAGE>   12
 
$250 for each committee meeting attended. Directors who are full-time employees
of the Company or its subsidiaries receive no additional compensation for Board
service.
 
     Outside directors may defer their compensation until retirement or other
termination of status as a director. Amounts deferred bear interest at 150% of
the Moody's Seasoned Corporate Rate.
 
     The Company also provides a retirement plan for its outside directors. With
a minimum of ten years of service, an outside director can retire and receive a
benefit equal to the annual retainer, at retirement, for serving on the
Company's Board. Directors who retire before age 65, after satisfying the
minimum service obligation will receive retirement benefits upon reaching age
65. A director is also eligible for an increased retirement benefit of $1,000
annually for each ten years of service on the Board beyond the minimum
qualifying service period. This increase in benefits is solely discretionary
with the Board.
 
COMMITTEES OF THE BOARD
 
     In order to assist it in discharging its duties, the Board of Directors has
established four permanent committees: (1) the Executive Committee; (2) the
Audit Committee; (3) the Nominating and Compensation Committee; and (4) the
Pension Plan Investment Committee.
 
     The Executive Committee meets, if necessary, during the months that the
full Board does not meet. The committee considers corporate policy matters
requiring timely action and recommends that certain other matters be considered
and acted upon by the Board of Directors. The Executive Committee consists of
Directors Guinn (Chairman), Dyer, Lincicome, Maffie and Sundt.
 
     The Audit Committee, whose functions are discussed above under the caption
"Selection of Independent Public Accountants," consists of Directors Batastini
(Chairman), Hartley, Jager, Judd, Lincicome and Sparks.
 
     The Nominating and Compensation Committee makes recommendations to the
Board on such matters as director fees, officer compensation and benefit
programs and compensation and benefit programs for all employees. The Nominating
and Compensation Committee also makes recommendations to the Board regarding
nominees to be proposed by the Board for election as directors. In considering
candidates for the Board, the Nominating and Compensation Committee seeks to
achieve an appropriate balance of expertise and diversity of interests
recognizing factors such as the character and quality of individuals,
experience, age, education, geographic location, anticipated participation in
Board activities and other personal attributes or special talents. The
Nominating and Compensation Committee will consider written suggestions from
shareholders regarding potential nominees for election as directors. To be
considered by the Nominating and Compensation Committee for inclusion in the
slate of nominees to be proposed by the Board, such suggestions should be
addressed to the Company's Corporate Secretary. The Nominating and Compensation
Committee consists of Directors Judd (Chairman), Cortez, Dyer, Guinn, Hartley
and Lincicome.
 
     The Pension Plan Investment Committee establishes, monitors and oversees
asset investment policy and practices of the retirement plan on a continuing
basis. The Pension Plan Investment Committee consists of Directors Sparks
(Chairman), Batastini, Cortez, Jager and Sundt.
 
     In 1994 the Executive Committee held one telephonic meeting, the Audit
Committee held three meetings, the Nominating and Compensation Committee held
four meetings and the Pension Plan Investment Committee held two meetings.
 
                      EXECUTIVE COMPENSATION AND BENEFITS
 
EXECUTIVE COMPENSATION REPORT
 
     The Nominating and Compensation Committee of the Board of Directors (the
"Committee") has prepared the following report on the Company's executive
compensation program.
 
                                        8
<PAGE>   13
 
     Under the supervision of the Committee, the Company has developed and
implemented an executive compensation program with the objectives of: (1)
reasonableness; (2) competitiveness; (3) internal equity; and (4) performance.
These objectives are addressed through an executive compensation program
established through industry-based compensation comparisons consisting of annual
salaries and a management incentive plan (the "Incentive Plan") that focuses on
specific annual and long-term Company financial performance objectives.
 
     The nature of the Company's operation has historically led to the
utilization of compensation systems widely used in industry, weighted for
utility companies, and accepted by various utility regulatory agencies.
Companies of comparable size used to establish the peer group index for the
"Performance Graph" were factored into the compensation review. Other utility
and general industry surveys were also used to assess the Company's compensation
program. Continued use of such systems is designed to address the first three
compensation objectives. A range of salaries that are comparable with industry
levels provides an objective standard to judge the reasonableness of the
Company's salaries, maintains the Company's ability to compete for and retain
qualified executive officers, and provides a means for ensuring that internal
responsibilities are properly rewarded. This same strategy is applied in
establishing executive officer salaries for the Company's financial services
subsidiary, PriMerit Bank.
 
     The fourth compensation objective, performance, is addressed through the
Company's Incentive Plan. The Incentive Plan is designed to retain key
management employees and to focus on specific annual and long-term Company
financial performance objectives. For the Company's chief executive and chief
financial officers, these objectives include the annual and long-term
performance objectives of the Company's financial services subsidiary.
 
     Salaries for executive officers are set relative to the mid-point levels
for their positions based on the above-described industry comparisons.
Compensation above those levels is tied to achieving specific financial
performance objectives under the Incentive Plan. An incentive opportunity
expressed as a percentage of salary, is established annually for each
participant. No performance awards are payable unless the Company's Common Stock
dividend equals or exceeds the prior year's dividend and the Company's
performance equals or exceeds a threshold percentage of the return-on-equity
performance target. The maximum award opportunities cannot exceed 140 percent of
the targeted awards for meeting the performance objectives.
 
     Awards under the Incentive Plan are determined by comparing the Company's
utility operations annual financial performance to a return-on-equity target.
The performance factors used to make this determination involve the average of
the Company's utility equity performance over the last three years (which is
weighted and adjusted for inflation), and the Company's current utility return-
on-equity performance in comparison to a peer group of natural gas distribution
companies. If the threshold percentage for either factor is achieved, a
percentage of annual performance awards will have been earned. Financial
performance factors for the Company's financial services subsidiary, which are
outlined below, are also taken into consideration in determining the annual
award for the Company's chief executive and chief financial officers.
 
     If annual performance awards are earned, payment of the awards will be
subject to a possible downward adjustment depending on Plan participants'
satisfaction of individual performance goals. The Committee will make the
individual performance determination for the Company's chief executive officer,
who, in turn, will make such determination for the remaining Incentive Plan
participants. Further, the actual awards will be split, with one-half of the
awards paid in cash and the remaining one-half converted into performance shares
tied to the value of the Company's Common Stock on the date of the awards. The
performance shares will be restricted for a period of three years and the
ultimate payout in Company Common Stock will be subject to continued employment
and the Company's financial performance during the subsequent three-year
restriction period.
 
     Separate peer groups of natural gas utility companies are used to assess
the Company's annual and long-term performance objectives. Natural gas
distribution utilities are used to assess
 
                                        9
<PAGE>   14
 
the annual performance of the Company's utility operations. Diversified natural
gas distribution utilities, consisting of the same companies used to assess the
Company's five-year performance reflected in the "Performance Graph" portion of
this Proxy Statement, are used to assess the Company's overall long-term
performance.
 
     The Company's financial services subsidiary provides performance based
incentive awards through its Executive Compensation Program. Under the plan,
separate incentive awards, each based on a percentage of salary for each
participant, are established for achieving annual and long-term performance
objectives. Annual performance is measured against a return-on-equity target for
core banking operations, while long-term performance is measured against an
average return-on-equity target for core banking operations of a peer group of
financial institutions. Annual awards are paid in cash at the time performance
is measured. Long-term awards, though measured annually, are withheld for the
three-year performance period. No performance awards are payable under the plan
unless actual performance exceeds a threshold percentage return on equity for
core banking operations for each performance period. The maximum award
opportunities cannot exceed 150 percent of the target awards.
 
     The Company's financial performance during 1994 exceeded the threshold
percentages for each of the established return-on-equity targets. The Company's
utility operation exceeded the threshold for the weighted three-year average
utility equity performance factor. The Company's financial services operations
exceeded the threshold for its annual performance goal and exceeded its
long-term performance target for the first year of the three-year performance
period.
 
     Mr. Maffie's salary for 1994, as the Company's chief executive officer, was
set relative to the mid-point level for salaries paid to chief executive
officers of comparable companies, taking into consideration the length of
service in his current position. His performance award opportunities under the
Incentive Plan took into consideration the Company's utility and financial
services operations, weighted 70 percent and 30 percent, respectively. The
performance award opportunities ranged from 30 to 84 percent of his annualized
salary at December 31, 1994, not his actual salary shown in the Summary
Compensation Table.
 
     Mr. Maffie's target performance award for 1994 was set equal to $231,000 or
60 percent of his annualized salary. Based on the Company's overall 1994
financial performance in relation to the established performance goals, Mr.
Maffie earned $124,247 or 54 percent of his target award. The performance of the
Company's utility operations accounted for 64 percent of Mr. Maffie's award, and
was evenly divided between cash and performance shares. The performance of the
Company's financial services subsidiary accounted for 36 percent of his award,
27 percent based on annual performance and 9 percent based on long-term
performance. The annual performance component of the award attributable to the
financial performance of the Company's financial services subsidiary was paid in
cash and the long-term performance component was converted into performance
shares under the provisions of the Incentive Plan.
 
     The Company does not anticipate that the compensation for any of its
executive officers will exceed the $1 million threshold in the near term;
therefore, shareholder approval necessary to maintain the tax deductibility of
compensation at or above that level is not being requested at this time. The
Committee will reconsider this matter if compensation levels approach this
threshold, in light of the tax laws then in effect.
 
                                       10
<PAGE>   15
 
     The Nominating and Compensation Committee believes that the compensation
program addresses the Company's compensation objectives, enhances the commitment
of key management employees and strengthens long-term shareholder value.
 
<TABLE>
<S>                             <C>
                        Nominating and Compensation Committee
 
                        Leonard R. Judd, Chairman       Kenny C. Guinn
                        Manuel J. Cortez                Thomas Y. Hartley
                        Lloyd T. Dyer                   James R. Lincicome
</TABLE>
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
     The above-named committee members served on the Company's Nominating and
Compensation Committee during 1994. Mr. Guinn retired as Chairman and Chief
Executive Officer of the Company on May 12, 1993 and retired as a full-time
employee of the Company on August 31, 1993. Mr. Guinn became a member of the
Committee after his retirement as an officer of the Company.
 
SUMMARY COMPENSATION TABLE
 
     The following table provides for fiscal years ended December 31, 1992, 1993
and 1994, compensation earned by the Company's Chief Executive Officer and each
of the four other most highly compensated executive officers of the Company.
 
                         SUMMARY COMPENSATION TABLE (1)
<TABLE>
<CAPTION>
                                                                          LONG-TERM COMPENSATION(2)
                                                                      ---------------------------------
                                                                              AWARDS            PAYOUTS
                                                                      -----------------------   -------
                                        ANNUAL COMPENSATION            RESTRICTED               
                               -------------------------------------      STOCK                  LTIP        ALL OTHER
       NAME AND                SALARY     BONUS      OTHER ANNUAL       AWARD(S)      OPTIONS/  PAYOUTS   COMPENSATION($)
  PRINCIPAL POSITION    YEAR     ($)     ($)(3)     COMPENSATION($)   ($)(3)(4)(5)    SARS(#)     ($)        (6)(7)(8)
- ----------------------  ----   -------   -------   -----------------  -------------   -------   -------   ----------------
<S>                     <C>    <C>       <C>              <C>             <C>           <C>       <C>          <C>
Michael O. Maffie       1994   370,616    73,149           0              51,098        N/A       N/A          32,898
 President/C.E.O.       1993   316,904    48,510           0              48,510        N/A       N/A          31,070
                        1992   256,503   109,100           0                 N/A        N/A       N/A          22,696
Dan J. Cheever          1994   226,770    69,913           0                 N/A        N/A       N/A          12,484
  President/C.E.O.      1993   208,725    75,000           0                 N/A        N/A       N/A           4,497
  PriMerit Bank         1992   178,771         0           0                 N/A        N/A       N/A           1,638
Thomas J. Trimble       1994   209,178    20,413           0              20,413        N/A       N/A          39,404
  Senior Vice           1993   206,345    19,219           0              19,219        N/A       N/A          38,223
  President/            1992   204,000    46,400           0                 N/A        N/A       N/A          31,178
  General Counsel/
  Corporate Secretary
George C. Biehl         1994   187,068    25,124           0              16,988        N/A       N/A           9,148
  Senior Vice           1993   175,449    16,632           0              16,632        N/A       N/A           8,732
  President/            1992   144,553    46,400           0                 N/A        N/A       N/A           6,681
  Chief Financial
  Officer
L. Keith Stewart        1994   154,712    15,359           0              15,359        N/A       N/A          11,650
  Senior Vice           1993   144,622    13,861           0              13,861        N/A       N/A          11,170
  President/            1992   132,432    30,000           0                 N/A        N/A       N/A           9,528
  Operations
</TABLE>
 
- ---------------
 
(1) All compensation reflected in the Summary Compensation Table is reported on
    an earned basis for each fiscal year.
 
(2) For 1992, the Company had no restricted stock, stock options or other
    long-term incentive programs.
 
(3) Bonuses and performance shares accrued for calendar year 1993 and 1994 were
    paid and awarded in 1994 and 1995, respectively.
 
(4) Dividends equal to the dividends paid on the Company's Common Stock will be
    paid on the performance shares awarded under the long-term component of the
    Company's management incentive plan during the restriction period.
 
(5) Messrs. Maffie, Trimble, Biehl and Stewart were awarded performance shares
    under the Company's management incentive plan. Mr. Cheever does not
    participate in the Company's plan. The total number of
 
                                       11
<PAGE>   16
 
    performance shares granted in 1994, for calendar year 1993, and their value
    based on the market price of Company Common Stock at December 30, 1994 for
    each individual are as follows:
 
<TABLE>
<CAPTION>
                                                  SHARES          VALUE
                                                  ------         -------
     <S>                                          <C>            <C>
     Mr. Maffie                                   2,864          $40,454
     Mr. Trimble                                  1,135           16,032
     Mr. Biehl                                      982           13,871
     Mr. Stewart                                    818           11,554
</TABLE>
 
(6) For Messrs. Maffie, Trimble, Biehl and Stewart, the amounts shown in this
    column for each year consist of above-market interest on deferred
    compensation and matching contributions under the Company's executive
    deferral plan. Under the plan, executive officers may defer up to 50% of
    their annual compensation for payment at retirement or at some other
    employment terminating event. Interest on such deferrals is set at 150% of
    the Moody's Seasoned Corporate Rate. As part of the plan, the Company
    provides matching contributions that parallel the contributions made under
    the Company's 401(k) plan, which is available to all Company employees,
    equal to one-half of the deferred amount, up to 6% of their annual salary.
 
(7) For Mr. Cheever, the amounts shown in this column consist of above-market
    interest on deferred compensation and matching contributions under PriMerit
    Bank's 401(k) and executive deferral plans. Under the Bank's executive
    deferral plan, which was adopted in 1994, Mr. Cheever may defer up to 50% of
    his annual compensation for payment at retirement or at some other
    employment terminating event. Interest on executive plan deferrals is set at
    150% of the Moody's Seasoned Corporate Rate. The Bank provides matching
    contributions equal to the amount deferred under each plan, up to 6% of Mr.
    Cheever's annual compensation.
 
(8) All Other Compensation consists of matching contributions under the
    Company's or PriMerit Bank's deferral plans and interest on such deferrals
    in excess of 120% of the Applicable Federal Long-term [bond] Rate. The
    breakdown of such compensation for each named executive officer is as
    follows:
 
<TABLE>
<CAPTION>
                                              INTEREST         CONTRIBUTIONS
                                              --------         -------------
       <S>                                    <C>              <C>
       Mr. Maffie                             $ 21,954            $10,944
       Mr. Cheever                               1,211             11,273
       Mr. Trimble                              33,129              6,275
       Mr. Biehl                                 3,540              5,608
       Mr. Stewart                               7,011              4,639
</TABLE>
- ---------------
 
                   LONG-TERM INCENTIVE PLAN AWARDS FOR 1994
 
     The following table summarizes the long-term cash incentive award earned by
Dan Cheever under PriMerit Bank's performance based executive compensation plan
for the three-year performance cycle of March 1, 1994 through February 28, 1997.
Of the named executive officers, only Mr. Cheever was eligible to participate in
the PriMerit Bank plan.
                         
<TABLE> 
<CAPTION>
                                                LONG-TERM INCENTIVE PLAN TABLE
                                                ------------------------------
                                                                   ESTIMATED FUTURE PAYOUT UNDER
                                                PERFORMANCE       NON-STOCK PRICE-BASED PLANS(1)
                                NUMBER OF         OR OTHER       ---------------------------------
                              SHARES, UNITS     PERIOD UNTIL                   TARGET      MAXIMUM
                                OR OTHER         MATURATION      THRESHOLD      ($ OR       ($ OR
              NAME              RIGHTS(#)        OF PAYOUT       ($ OR #)        #)          #)
    ------------------------  -------------     ------------     ---------     -------     -------
    <S>                            <C>             <C>            <C>          <C>         <C>
    Dan Cheever                    N/A             1994-1997      $23,170      $23,170     $23,170
</TABLE>
- ---------------
 
(1) The long-term performance award earned by Mr. Cheever represents 20 percent
    or the first year's percentage of such award. The award is not subject to
    further adjustment during the performance period; however, if PriMerit Bank
    fails to maintain a threshold weighted average return on equity for its core
    bank operations for the performance period, the award will be reduced to
    zero.
- ---------------
 
                                       12
<PAGE>   17
 
BENEFIT PLANS
 
     Southwest Gas Basic Retirement Plan.  The named executive officers
participate in the Company's non-contributory, defined benefit retirement plan,
which is available to all employees of the Company and its subsidiaries (except
PriMerit Bank which has a separate plan). Benefits are based upon an employee's
years of service, up to a maximum of 30 years, and the employee's highest five
consecutive years salary within the final 10 years of service.
 
                            PENSION PLAN TABLE(1)(2)
 
<TABLE>
<CAPTION>
                                    YEARS OF SERVICE
   ANNUAL      -----------------------------------------------------------
COMPENSATION     10           15           20           25           30
- -------------  -------     --------     --------     --------     --------
<S>            <C>         <C>          <C>          <C>          <C>
  $ 50,000     $ 8,750     $ 13,125     $ 17,500     $ 21,875     $ 26,250
   100,000      17,500       26,250       35,000       43,750       52,500
   150,000      26,250       39,375       52,500       65,625       78,750
   200,000      35,000       52,500       70,000       87,500      105,000
   250,000      43,750       65,625       87,500      109,375      131,250
   300,000      52,500       78,750      105,000      131,250      157,500
   350,000      61,250       91,875      122,500      153,125      183,750
   400,000      70,000      105,000      140,000      175,000      210,000
   450,000      78,750      118,125      157,500      196,875      236,250
   500,000      87,500      131,250      175,000      218,750      262,500
</TABLE>
 
- ---------------
 
(1) Years of service beyond 30 years will not increase benefits under the basic
    retirement plan.
 
(2) For 1995, the maximum annual compensation that can be considered in
    determining benefits under the Plan is $150,000. For future years the
    maximum annual compensation will be adjusted to reflect changes in the cost
    of living as established by the Internal Revenue Service.
- ---------------
 
     Compensation covered under the basic retirement plan is based on salary
depicted in the Summary Compensation Table. As of December 31, 1994, the
credited years of service for the named executive officers shown in the Summary
Compensation Table are as follows: Mr. Maffie, 16 years; Mr. Biehl, 9 years; Mr.
Stewart, 10 years; and Mr. Trimble, 8 years.
 
     Amounts shown in the pension plan table are straight life annuity amounts
notwithstanding the availability of joint survivorship benefit provisions.
Benefits paid under the basic and supplemental retirement plans are not reduced
by any Social Security benefits received.
 
     Supplemental Retirement Plan.  The named executive officers also
participate in the Company's supplemental retirement plan. Such officers with 10
or more years of service may retire at age 55 or older and will receive benefits
under the plan. Such benefits, when added to benefits received under the basic
retirement plan, will equal 60% of their highest 12-months of compensation with
the Company. The total benefit may be reduced if an officer retires prior to age
60, depending upon his age and total years of service with the Company. The cost
to the Company for benefits under the supplemental retirement plan for any one
of the named executive officers cannot be properly allocated or determined
because of the overall plan assumptions and options available.
 
                                       13
<PAGE>   18
 
     PriMerit Bank Retirement Income Plan.  Mr. Cheever, who is a named
executive officer, participates in PriMerit Bank's non-contributory, defined
benefit retirement plan. Through March 1994, benefits were based upon an
employee's years of service, up to a maximum of 15 years, and the employee's 60
highest paid consecutive months of employment with the Bank. Commencing April 1,
1994, the plan was curtailed. Employees hired on or after that date will not be
able to participate in the plan, while existing employees will not be able to
increase benefits under the plan through additional years of service with the
Bank. Salary changes for existing employees, however, will continue to affect
plan benefits.
 
                            PENSION PLAN TABLE(1)(2)
 
<TABLE>
<CAPTION>
                                   YEARS OF SERVICE
   ANNUAL              ----------------------------------------
COMPENSATION              5              10               15
- -------------          -------         -------         --------
<S>                    <C>             <C>             <C>
  $ 50,000             $ 5,833         $11,667         $ 17,500
   100,000              11,667          23,333           35,000
   150,000              17,500          35,000           52,500
   200,000              23,334          46,667           70,000
   250,000              29,138          58,336           87,500
   300,000              34,965          70,004          105,000
</TABLE>
 
- ---------------
 
(1) Prior to March 31, 1994, years of service beyond 15 years would not increase
    benefits under the plan. With the curtailment of the plan, additional years
    of service will no longer increase benefits under the plan.
 
(2) For 1995, the maximum annual compensation that can be considered in
    determining benefits under the Plan is $150,000. For future years the
    maximum annual compensation will be adjusted to reflect changes in the cost
    of living as established by the Internal Revenue Service.
- ---------------
 
     Compensation covered under the basic retirement plan is based on salary
depicted in the Summary Compensation Table. At the time the plan was curtailed,
Mr. Cheever had 5 years of service with the Bank. Only future salary changes
will affect Mr. Cheever's benefits under the plan.
 
     Amounts shown in the pension plan table are straight life annuity amounts
notwithstanding the availability of joint survivorship benefit provisions.
Benefits paid under the Bank's basic and supplemental retirement plans are not
reduced by any Social Security benefits.
 
     PriMerit Bank Supplemental Executive Retirement Plan.  Mr. Cheever also
participates in the Bank's supplemental retirement plan. Participation in the
supplemental plan is limited to officers of the Bank selected by the Bank's
Board of Directors. Benefits under the plan, when added to benefits received
under the defined benefit retirement plan, will equal 60 percent of the
participant's average annual salary over the 60 highest paid consecutive months
of service. The total benefit will be reduced if a participant retires prior to
age 65, and with less than 15 years of service with the Bank. The cost to the
Bank for benefits under the supplemental retirement plan for Mr. Cheever cannot
be properly determined because of the overall plan assumptions and options
available.
 
CHANGE IN CONTROL ARRANGEMENT
 
     PriMerit Bank, during 1994, entered into an agreement with Mr. Cheever that
is designed to support his continued employment with the Bank. Under the terms
of the agreement, Mr. Cheever would be entitled to a lump sum benefit payment of
$500,000 if he is employed by the Bank at the time of a change in control of the
Bank. Such payment would become due and payable only after the occurrence of a
change in control. The agreement also provides that Mr. Cheever would be
entitled to a lump sum deferred compensation benefit equal to 200% of his annual
salary if his employment with the Bank is terminated (or his responsibilities
are substantially changed without his consent) within 12 calendar months of a
change in control for other than cause, death, disability or retirement. The
agreement expires in May 1995; however, it may be extended for successive
one-year periods.
 
                                       14
<PAGE>   19
 
                               PERFORMANCE GRAPH
 
     The performance graph below compares the five-year cumulative total return
on the Company's Common Stock, assuming reinvestment of dividends, with the
total returns on the Standard & Poor's 500 Stock Composite Index (S&P 500) and
the Edward D. Jones Natural Gas Diversified Index, a peer-group index compiled
by Edward D. Jones & Company, consisting of the Company and 21 other diversified
natural gas distribution companies.
 
COMPARISON OF 5-YEAR CUMULATIVE TOTAL RETURNS
 
<TABLE>
<CAPTION>
                                                              E. D. JONES
                                                              NATURAL GAS
  MEASUREMENT PERIOD                                          DIVERSIFIED
(FISCAL YEAR COVERED)        SOUTHWEST GAS      S&P 500          INDEX
- ---------------------        -------------      -------       -----------
        <S>                      <C>             <C>             <C>
        1989                     100             100             100
        1990                      83.1            96.9            88.0
        1991                      73.4           126.3            74.5
        1992                     100.0           135.9            79.0
        1993                     121.5           149.5            90.3
        1994                     112.4           151.6            78.4
</TABLE>
 
- ---------------
 
(1) The Company selected the Edward D. Jones Natural Gas Diversified Index as a
    peer-group index because it provides a representative sample of natural gas
    distribution companies with at least 30%, but less than 90%, of their gross
    revenues from distribution operations. This index should be available on a
    continuing basis.
 
(2) The Edward D. Jones Natural Gas Diversified Index, which is weighted
    according to each respective issuer's market capitalization at the beginning
    of each period, consists of the following companies; Alabama/Tennessee
    Resources, Inc., Chesapeake Utilities Corp., Columbia Gas System,
    Consolidated Natural Gas, Eastern Enterprises, Energen Corp., Enserch Corp.,
    Equitable Resources, Inc., KN Energy, Inc., National Fuel Gas Co., National
    Gas & Oil Co., Noram Energy Corp., Oneok, Inc., Pacific Enterprises,
    Pennsylvania Enterprises, Inc., Questar Corp., South Jersey Industries,
    Southwest Gas Corporation, Southwestern Energy Co., UGI Corp., and Valley
    Resources, Inc.
- ---------------
 
                                       15
<PAGE>   20
 
                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
 
     During 1994 some directors and executive officers of the Company were
depositors of, and had transactions with, PriMerit Bank, the Company's financial
services subsidiary. These transactions were on the same terms (including
interest rates, repayment terms and collateral) as those prevailing at the time
for comparable transactions with other persons of similar credit-worthiness and,
in the opinion of the Board of Directors of PriMerit Bank, do not involve more
than a normal risk of collectibility or other unfavorable characteristics.
 
                    OTHER MATTERS TO COME BEFORE THE MEETING
 
     If any business not described herein should come before the meeting for
shareholder action, it is intended that the shares represented by proxies will
be voted in accordance with the best judgment of the persons voting them. At the
time this proxy statement was mailed, the Company knew of no other matters which
might be presented for shareholder action at the meeting.
 
                      SUBMISSION OF SHAREHOLDER PROPOSALS
 
     Shareholders are advised that any shareholder proposal intended for
consideration at the 1996 annual meeting must be received in writing by the
Company on or before December 4, 1995 to be considered for inclusion in the
proxy materials for the 1996 annual meeting. All proposals must comply with
applicable SEC rules. It is recommended that shareholders submitting proposals
direct them to the Corporate Secretary of the Company and utilize Certified
Mail-Return Receipt Requested in order to ensure timely delivery.
 
                                            By Order of the Board of Directors


                                                          [SIG]

                                                    Thomas J. Trimble
                                          Senior Vice President/General Counsel
                                                 and Corporate Secretary
 
                                       16
<PAGE>   21
 
                           SOUTHWEST GAS CORPORATION
                 P.O. Box 98510, Las Vegas, Nevada 89193-8510
 
          THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS
 
    The undersigned hereby appoints Kenny C. Guinn and Lloyd T. Dyer as      
Proxies, each with the power to appoint his substitute, and hereby           P
authorizes them to represent and to vote as designated below, all the        R
shares of common stock of the undersigned at the annual meeting of           O
shareholders to be held on Thursday, May 11, 1995, at the Company's          X
Headquarters at 5241 Spring Mountain Road, Las Vegas, Nevada, and any        Y
adjournments thereof; and at their discretion, with authorization to vote 
such common shares on any other matters as may properly come before the 
meeting or any adjournments thereof.
 
1. ELECTION OF DIRECTORS
<TABLE>
   <S>                          <C>                          <C>                          <C>
   Ralph C. Batastini           Kenny C. Guinn               Leonard R. Judd              Carolyn M. Sparks
   Manuel J. Cortez             Thomas Y. Hartley            James R. Lincicome           Robert S. Sundt
   Lloyd T. Dyer                Michael B. Jager             Michael O. Maffie
</TABLE>
 
/ /  FOR all the foregoing nominees      / /  WITHHOLD AUTHORITY to vote for all
                             the foregoing nominees
 
  NOTE:  TO WITHHOLD AUTHORITY TO VOTE FOR ANY INDIVIDUAL NOMINEE, STRIKE A LINE
  THROUGH THAT NOMINEE'S NAME. UNLESS AUTHORITY TO VOTE FOR ALL THE FOREGOING
  NOMINEES IS WITHHELD, THIS PROXY WILL BE DEEMED TO CONFER AUTHORITY TO VOTE
  FOR EVERY NOMINEE WHOSE NAME IS NOT STRUCK.

2. PROPOSAL TO APPROVE THE APPOINTMENT OF ARTHUR ANDERSEN LLP as the independent
   public accountants of the corporation:
                / /  FOR        / /  AGAINST        / /  ABSTAIN
 
               (IMPORTANT -- SIGNATURE REQUIRED ON REVERSE SIDE)
 
P       THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED
R    HEREIN BY THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS
O    PROXY  WILL BE VOTED FOR PROPOSALS 1 AND 2. FURTHER, IF CUMULATIVE VOTING
X    RIGHTS  FOR THE ELECTION OF DIRECTORS (PROPOSAL 1) ARE EXERCISED, THE
Y    PROXIES,  UNLESS OTHERWISE INSTRUCTED, WILL CUMULATIVELY VOTE THEIR
     SHARES AS  PROVIDED FOR IN THE PROXY STATEMENT.
 
                                                        Dated:            , 1995

                                                              (Signature)

                                                           (Signature if held
                                                                jointly)
                                                        Please sign exactly as
                                                        name(s) appears on this
                                                        proxy. When shares are
                                                        held by joint tenants,
                                                        both should sign. When
                                                        signing as attorney,
                                                        executor, administrator,
                                                        trustee or guardian,
                                                        please give full title
                                                        as such. If a
                                                        corporation, please sign
                                                        in full corporate name
                                                        by president or other
                                                        authorized officer. If a
                                                        partnership, please sign
                                                        in partnership name by
                                                        authorized person.
Y


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