SOUTHWEST GAS CORP
10-K405, 1997-03-28
NATURAL GAS TRANSMISISON & DISTRIBUTION
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<PAGE>   1
 
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                                   FORM 10-K
                ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF
                      THE SECURITIES EXCHANGE ACT OF 1934
 
                  FOR THE FISCAL YEAR ENDED DECEMBER 31, 1996
 
                         COMMISSION FILE NUMBER 1-7850
 
                           SOUTHWEST GAS CORPORATION
              (EXACT NAME OF REGISTRANT SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                                           <C>
                  CALIFORNIA                                    88-0085720
       (STATE OR OTHER JURISDICTION OF                       (I.R.S. EMPLOYER
        INCORPORATION OR ORGANIZATION)                      IDENTIFICATION NO.)

          5241 SPRING MOUNTAIN ROAD
            POST OFFICE BOX 98510
              LAS VEGAS, NEVADA                                 89193-8510
   (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)                     (ZIP CODE)
</TABLE>
 
       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (702) 876-7237
 
          SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:
 
<TABLE>
<CAPTION>
                                                           NAME OF EACH EXCHANGE
             TITLE OF EACH CLASS                            ON WHICH REGISTERED
             -------------------                           ---------------------
<S>                                           <C>
          Common Stock, $1 par value                   New York Stock Exchange, Inc.
                                                       Pacific Stock Exchange, Inc.
 9.125% Trust Originated Preferred Securities          New York Stock Exchange, Inc.
                                                       Pacific Stock Exchange, Inc.
            Stock Purchase Rights                      New York Stock Exchange, Inc.
                                                       Pacific Stock Exchange, Inc.
</TABLE>
 
     Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.  Yes X  No 
                                              ---   ---
     Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [X]
 
               AGGREGATE MARKET VALUE OF THE VOTING STOCK HELD BY
                        NONAFFILIATES OF THE REGISTRANT:
                         $504,395,738 at March 14, 1997
 
               THE NUMBER OF SHARES OUTSTANDING OF COMMON STOCK:
       Common Stock, $1 Par Value, 26,901,106 shares as of March 14, 1997
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
<TABLE>
<CAPTION>
                            DESCRIPTION                                PART INTO WHICH INCORPORATED
                            -----------                                ----------------------------
<S>                                                                    <C>
Annual Report to Shareholders for the Year Ended December 31, 1996          Parts I, II and IV
               Proxy Statement dated March 31, 1997                              Part III
</TABLE>
 
================================================================================
<PAGE>   2
 
                               TABLE OF CONTENTS
 
                                     PART I
 
<TABLE>
<CAPTION>
                                                                                         PAGE
                                                                                         ----
<S>       <C>                                                                            <C>
ITEM 1.   BUSINESS.....................................................................     1
          Natural Gas Operations.......................................................     1
            General Description........................................................     1
            Rates and Regulation.......................................................     2
            Competition................................................................     3
            Demand for Natural Gas.....................................................     3
            Natural Gas Supply.........................................................     4
            Environmental Matters......................................................     4
            Employees..................................................................     5
          Construction Services........................................................     5
ITEM 2.   PROPERTIES...................................................................     5
ITEM 3.   LEGAL PROCEEDINGS............................................................     8
ITEM 4.   SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS..........................     8
                                           PART II
ITEM 5.   MARKET FOR THE REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS....     8
ITEM 6.   SELECTED FINANCIAL DATA......................................................     8
ITEM 7.   MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF
          OPERATIONS...................................................................     8
ITEM 8.   FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA..................................     8
ITEM 9.   CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL
          DISCLOSURE...................................................................     8
                                          PART III
ITEM 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT...........................     8
ITEM 11.  EXECUTIVE COMPENSATION.......................................................     9
ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT...............     9
ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS...............................    10
                                           PART IV
ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K.............    10
          List of Exhibits.............................................................    11
SIGNATURES.............................................................................    15
</TABLE>
<PAGE>   3
 
                                     PART I
 
ITEM 1.  BUSINESS
 
     The registrant, Southwest Gas Corporation (the Company), is incorporated
under the laws of the State of California effective March 1931. The executive
offices of the Company are located at 5241 Spring Mountain Road, P.O. Box 98510,
Las Vegas, Nevada, 89193-8510, telephone number (702) 876-7237.
 
     The Company is principally engaged in the business of purchasing,
transporting, and distributing natural gas to residential, commercial, and
industrial customers in geographically diverse portions of Arizona, Nevada, and
California (Southwest or the natural gas operations segment).
 
     In April 1996, the Company acquired all of the outstanding stock of
Northern Pipeline Construction Co. (Northern or the construction services
segment) pursuant to a definitive agreement dated November 1995. The Company
issued approximately 1,439,000 shares of common stock valued at $24 million in
connection with the acquisition. The construction services segment provides
utility companies with trenching and installation, replacement, and maintenance
services for energy distribution systems.
 
     In January 1996, the Company entered into a definitive agreement with
Norwest Corporation (Norwest) to sell PriMerit Bank, Federal Savings Bank
(PriMerit), a wholly owned subsidiary, to Norwest for $175 million. In April
1996, Norwest elected, pursuant to an option in the original agreement, to
structure the acquisition as a purchase of substantially all of the assets and
liabilities of PriMerit in exchange for consideration of $191 million. The
Company paid an additional $16 million in income taxes by virtue of consummating
the sale as a purchase of assets and assumption of liabilities. The
consideration of $191 million, therefore, provided the economic equivalent to
the Company of a sale of stock of PriMerit for $175 million. The sale closed in
July 1996, following receipt of shareholder and various governmental approvals
and satisfaction of other customary closing conditions. Net proceeds of
approximately $163 million were initially used to pay down short-term debt and a
portion of term-loan facilities. Debt incurred in connection with its investment
in PriMerit was retired in August 1996. For consolidated financial reporting
purposes, the financial services activities are disclosed as discontinued
operations.
 
     Financial information with respect to the Company's industry segments is
included in Note 12 of the Notes to Consolidated Financial Statements which is
included in the Annual Report to Shareholders and is incorporated herein by
reference.
 
                             NATURAL GAS OPERATIONS
 
GENERAL DESCRIPTION
 
     Southwest is subject to regulation by the Arizona Corporation Commission
(ACC), the Public Service Commission of Nevada (PSCN), and the California Public
Utilities Commission (CPUC). These commissions regulate public utility rates,
practices, facilities, and service territories in their respective states. The
CPUC also regulates the issuance of all securities by the Company, with the
exception of short-term borrowings. Certain of the Company's accounting
practices, transmission facilities, and rates are subject to regulation by the
Federal Energy Regulatory Commission (FERC).
 
     Southwest purchases, transports, and distributes natural gas to
approximately 1,092,000 residential, commercial, and industrial customers in
geographically diverse portions of Arizona, Nevada, and California. There were
63,000 customers added to the system during 1996.
 
                                        1
<PAGE>   4
 
     The table below lists Southwest's percentage of operating margin (operating
revenues less net cost of gas) by major customer class for the years indicated:
 
<TABLE>
<CAPTION>
                                                                                        ELECTRIC
                                                                                      GENERATION,
                                           RESIDENTIAL AND     LARGE COMMERCIAL,      RESALE, AND
               FOR THE YEAR ENDED          SMALL COMMERCIAL   INDUSTRIAL AND OTHER   TRANSPORTATION
               ------------------          ----------------   --------------------   --------------
        <S>                                <C>                <C>                    <C>
        December 31, 1996................         80%                   6%                 14%
        December 31, 1995................         79                    7                  14
        December 31, 1994................         79                    7                  14
</TABLE>
 
     Southwest is not dependent on any one or a few customers to the extent that
the loss of any one or several would have a significant adverse impact on
earnings.
 
     Transportation of customer-secured gas to end-users on Southwest's system
accounted for 54 percent of total system throughput in 1996. Although the
volumes were significant, these customers provide a much smaller proportionate
share of operating margin. In 1996, customers who utilized this service
transported 968 million therms, contributing 11 percent of operating margin.
 
     The demand for natural gas is seasonal. Variability in weather from normal
temperatures may materially impact results of operations. It is management's
opinion that comparisons of earnings for interim periods do not reliably reflect
overall trends and changes in Southwest's operations. Also, earnings for interim
periods can be significantly affected by the timing of general rate relief.
 
RATES AND REGULATION
 
     Rates that Southwest is authorized to charge its distribution system
customers are determined by the ACC, CPUC, and PSCN in general rate cases and
are derived using rate base, cost of service, and cost of capital experienced in
a historical test year, as adjusted in Arizona and Nevada, and projected for a
future test year in California. The FERC regulates the northern Nevada
transmission and liquefied natural gas (LNG) storage facilities of Paiute
Pipeline Company (Paiute), a wholly owned subsidiary, and the rates it charges
for transportation of gas directly to certain end-users and to various local
distribution companies (LDCs). The LDCs transporting on Paiute's system are:
Sierra Pacific Power Company (serving Reno and Sparks, Nevada), WP Natural Gas
(serving South Lake Tahoe, California), and Southwest Gas Corporation (serving
North Lake Tahoe, California and various locations throughout northern Nevada).
 
     Rates charged to customers vary according to customer class and are set at
levels allowing for the recovery of all prudently incurred costs, including a
return on rate base sufficient to pay interest on debt, preferred securities
distributions, and a reasonable return on common equity. Southwest's rate base
consists generally of the original cost of utility plant in service, plus
certain other assets such as working capital and inventories, less accumulated
depreciation on utility plant in service, net deferred income tax liabilities,
and certain other deductions. Rate schedules in all of Southwest's service areas
contain purchased gas adjustment (PGA) clauses which allow Southwest to file for
rate adjustments as the cost of purchased gas changes. Generally, Southwest
tariffs provide for annual adjustment dates for changes in purchased gas costs.
However, Southwest may request to adjust its rates more often than once each
year, if conditions warrant. These changes have no direct impact on profit
margin.
 
                                        2
<PAGE>   5
 
     The table below lists the docketed general rate filings initiated and/or
completed within each ratemaking area in 1996:
 
<TABLE>
<CAPTION>
                                                                                     MONTH
                                                                                  FINAL RATES
            RATEMAKING AREA              TYPE OF FILING         MONTH FILED        EFFECTIVE
    -------------------------------  ----------------------    --------------    -------------
    <S>                              <C>                       <C>               <C>
    Arizona:
      Central and Southern           General rate case         November 1996          --
    California:
      Northern                       Operational Attrition     November 1996     January 1997
    Nevada:
      Northern and Southern          General rate case         December 1995       July 1996
    FERC:
      Paiute                         General rate case           July 1996            (1)
</TABLE>
 
- ---------------
 
(1) Interim rates reflecting the increased revenues became effective in January
    1997. The rates are subject to refund until a final order is issued.
 
COMPETITION
 
     Electric utilities are Southwest's principal competitors for the
residential and small commercial markets throughout its service areas.
Competition for space heating, general household, and small commercial energy
needs generally occurs at the initial installation phase when the
customer/builder typically makes the decision as to which type of equipment to
install and operate. The customer will generally continue to use the chosen
energy source for the life of the equipment. As a result of its success in these
markets, Southwest has experienced consistent growth among the residential and
small commercial customer classes.
 
     Unlike residential and small commercial customers, certain large
commercial, industrial, and electric generation customers have the capability to
switch to alternative energy sources. Southwest has been successful in retaining
these customers by setting rates at levels competitive with alternative energy
sources such as fuel oils and coal. As a result, management does not anticipate
any material adverse impact on its operating margin from fuel switching.
 
     Southwest continues to compete with interstate transmission pipeline
companies, such as El Paso Natural Gas Company (El Paso), Kern River Gas
Transmission Company (Kern River), and Tuscarora Gas Transmission Company, to
provide service to large end-users. End-use customers located in close proximity
to these interstate pipelines pose a potential bypass threat and, therefore,
require Southwest to closely monitor each customer's situation and provide
competitive service in order to retain the customer.
 
     Southwest has maintained an intensive effort to mitigate bypass risks
through the use of discounted transportation contract rates, special long-term
contracts with electric generation and cogeneration customers, and new tariff
programs. One such program provides an opportunity for potential bypass
customers in Arizona and all transportation customers in Nevada to purchase
natural gas-related services as a bundled package, including the procurement of
gas supply. Southwest enters into gas supply contracts for eligible customers,
which are not included in its system supply portfolio, and provides nomination
and balancing services on behalf of the customer. This program, as well as
Southwest's other competitive response initiatives and otherwise competitive
rates, has helped mitigate the financial impact from the threat of bypass.
 
DEMAND FOR NATURAL GAS
 
     Deliveries of natural gas by Southwest are made under a priority system
established by each regulatory commission having jurisdiction over Southwest.
The priority system is intended to ensure that the gas requirements of
higher-priority customers, primarily residential customers and nonresidential
customers who use 500 therms of gas per day or less, are fully satisfied on a
daily basis before lower-priority customers, primarily electric utility and
large industrial customers able to use alternative fuels, are provided any
quantity of gas or capacity.
 
                                        3
<PAGE>   6
 
     Demand for natural gas is greatly affected by temperature. On cold days,
use of gas by residential and commercial customers may be as much as eight times
greater than on warm days because of increased use of gas for space heating. To
fully satisfy this increased high-priority demand, gas is withdrawn from
storage, or peaking supplies are purchased from suppliers. If necessary, service
to interruptible lower-priority customers may be curtailed to provide the needed
delivery system capacity. Southwest maintains no backlog on its orders for gas
service.
 
     Southwest has entered the residential cooling market by working with the
manufacturers of gas air conditioning units and the builders of new residential
units in the Arizona and southern Nevada service areas. Gas air conditioning
represents an emerging market with the long-term potential for Southwest to
smooth its currently seasonal earnings.
 
     Natural gas vehicles (NGVs) represent another nontraditional source of
demand for natural gas. Southwest encourages the use of NGVs throughout its
service territories. As of December 31, 1996, there were 38 public- and
nonpublic-access fueling stations and approximately 3,900 NGVs in use throughout
Southwest's service territories. As more public fueling stations come on-line
and stricter vehicle emission standards are adopted, the demand for NGVs should
increase.
 
NATURAL GAS SUPPLY
 
     Southwest believes that natural gas supplies and pipeline capacity will
remain plentiful and readily available. Gas supplies for Southwest's southern
system (the Arizona, southern Nevada and southern California properties) are
primarily obtained from producing regions in New Mexico (San Juan basin), Texas
(Permian basin), and Rocky Mountain areas. For its northern system (the northern
Nevada and northern California properties), Southwest primarily obtains gas from
Rocky Mountain producing areas and from Canada. Southwest arranges for
transportation of gas to its Arizona, Nevada, and California service territories
through the pipeline systems of El Paso, Kern River, Northwest Pipeline
Corporation, and Southern California Gas Company (SoCal). Supply and pipeline
capacity availability on both short- and long-term bases are continually
monitored by Southwest to ensure the continued reliability of service to its
customers.
 
     Southwest's primary objective with respect to gas supply is to ensure that
adequate, as well as economical, supplies of natural gas are available from
reliable sources. Gas is acquired from a wide variety of sources, including
suppliers on the spot market and those who provide firm supplies over short-term
and longer-term durations. Balancing firm supply assurances against the
associated costs dictate a continually changing natural gas purchasing mix
within the supply portfolio. Southwest believes its balanced portfolio provides
security as well as the operating flexibility needed to meet changing market
conditions. During 1996, Southwest acquired gas supplies from over 70 suppliers.
In managing its gas supply portfolio, Southwest does not utilize derivative
financial instruments.
 
     Southwest continues to evaluate natural gas storage as an option to enable
it to take advantage of seasonal price differentials in obtaining natural gas
from a variety of sources to meet the growing demand of its customers.
 
     The purchase of natural gas at the wellhead is not regulated. Natural gas
prices have demonstrated seasonal volatility with higher prices in the heating
season and lower prices during the summer or off-peak consumption period. The
latter part of 1996 witnessed particularly steep price increases. See additional
discussion regarding the effect of changing natural gas prices included in the
Capital Resources & Liquidity section of Management's Discussion and Analysis,
which is included in the Annual Report to Shareholders.
 
ENVIRONMENTAL MATTERS
 
     Federal, state, and local laws and regulations governing the discharge of
materials into the environment have had little direct impact upon Southwest.
Environmental efforts, with respect to matters such as protection of endangered
species and archeological finds, have increased the complexity and time required
to obtain pipeline rights-of-way and construction permits. However, increased
environmental legislation and regulation are also beneficial to the natural gas
industry. Because natural gas is one of the most environmen-
 
                                        4
<PAGE>   7
 
tally safe fuels currently available, its use helps energy users to comply with
stricter environmental standards. For example, legislation, such as the Clean
Air Act Amendments of 1990 and the Energy Policy Act of 1992, has a positive
effect on natural gas demand, including provisions encouraging the use of
natural gas vehicles, cogeneration, and independent power production.
 
EMPLOYEES
 
     At December 31, 1996, the natural gas operations segment had 2,424 regular
full-time equivalent employees. Southwest believes it has a good relationship
with its employees. No employees are represented by a union.
 
     Reference is hereby made to Item 10 in Part III of this report on Form 10-K
for information relative to the executive officers of the Company.
 
                             CONSTRUCTION SERVICES
 
     Northern Pipeline Construction Co. (Northern or the construction services
segment) is a full-service underground piping contractor which provides utility
companies with trenching and installation, replacement, and maintenance of
energy distribution systems. Northern contracts primarily with LDCs to install,
repair, and maintain energy distribution systems from the town border station to
the end-user's meter. The primary focus of business operations is main and
service replacement as well as new business installations. Construction work
varies from relatively small projects to the piping of entire communities.
Construction activity is seasonal with work generally scheduled for the spring
through fall months in colder climate areas, such as the Midwest. In warmer
climate areas, such as the southwestern United States, construction occurs year
round.
 
     Northern's business activities are often concentrated in utility service
territories where existing gas lines are scheduled for replacement. An LDC will
typically contract with Northern to provide pipe replacement services and new
line installations. Contract terms generally specify unit price or fixed-price
arrangements. Unit price contracts establish prices for all of the various
services to be performed during the contract period. These contracts often have
annual pricing reviews. During 1996, more than 90 percent of revenue was earned
under unit price contracts. As of December 31, 1996 no backlog exists with
respect to outstanding construction contracts.
 
     Competition within the industry is limited to several regional competitors
in what can be characterized as a largely fragmented industry. Northern
currently operates in approximately 20 major markets nationwide. Its customers
are the primary LDCs in those markets. Construction companies typically depend
on a few customers for their business. During 1996, Southwest accounted for 37
percent of Northern's revenues. No other customers contributed more than 10
percent of revenues.
 
     Employment fluctuates between seasonal construction periods, which are
normally heaviest in the summer and fall months. At December 31, 1996, Northern
had 1,289 regular full-time equivalent employees. Employment peaked in October
1996 when there were 1,802 employees. The majority of the employees are
represented by collective bargaining agreements which is typical of the
construction industry.
 
     Operations are conducted from 22 field locations with corporate
headquarters located in Phoenix, Arizona. All buildings are leased from third
parties. The lease terms are typically two to three years. Field location
facilities consist of a small building for repairs and acreage to store
equipment.
 
     Northern has acquired and professionally maintained state-of-the-art work
equipment required to ensure high quality performance and maximum efficiency.
Innovative technology is utilized to continuously improve productivity,
efficiency, and customer satisfaction. Northern has a strict policy for
maintaining its equipment and also adheres to a replacement program for the
majority of key equipment in order to minimize downtime and preserve resale
values.
 
ITEM 2. PROPERTIES
 
     The plant investment of Southwest consists primarily of transmission and
distribution mains, compressor stations, peak shaving/storage plants, service
lines, meters, and regulators which comprise the pipeline systems and facilities
located in and around the communities served. Southwest also includes other
properties such as
 
                                        5
<PAGE>   8
 
land, buildings, furnishings, work equipment, and vehicles in plant investment.
Southwest's northern Nevada and northern California properties are referred to
as the northern system; the Arizona, southern Nevada, and southern California
properties are referred to as the southern system. Several properties are leased
by Southwest, including an LNG storage plant on its northern Nevada system and a
portion of the corporate headquarters office complex located in Las Vegas,
Nevada. Total gas plant, exclusive of leased property, at December 31, 1996, was
$1.7 billion, including construction work in progress. It is the opinion of
management that the properties of Southwest are suitable and adequate for its
purposes.
 
     Substantially all of Southwest's gas main and service lines are constructed
across property owned by others under right-of-way grants obtained from the
record owners thereof, on the streets and grounds of municipalities under
authority conferred by franchises or otherwise, or on public highways or public
lands under authority of various federal and state statutes. None of Southwest's
numerous county and municipal franchises are exclusive, and some are of limited
duration. These franchises are renewed regularly as they expire, and Southwest
anticipates no serious difficulties in obtaining future renewals.
 
     With respect to the right-of-way grants, Southwest has had continuous and
uninterrupted possession and use of all such rights-of-way, and the associated
gas mains and service lines, commencing with the initial stages of the
construction of such facilities. Permits have been obtained from public
authorities in certain instances to cross, or to lay facilities along, roads and
highways. These permits typically are revocable at the election of the grantor,
and Southwest occasionally must relocate its facilities when requested to do so
by the grantor. Permits have also been obtained from railroad companies to cross
over or under railroad lands or rights-of-way, which in some instances require
annual or other periodic payments and are revocable at the grantors' elections.
 
     Southwest operates two major pipeline transmission systems: (i) a system
owned by Paiute, a wholly owned subsidiary, extending from the Idaho-Nevada
border to the Reno, Sparks, and Carson City areas and communities in the Lake
Tahoe area in both California and Nevada and other communities in northern and
western Nevada; and (ii) a system extending from the Colorado River at the
southern tip of Nevada to the Las Vegas distribution area.
 
                                        6
<PAGE>   9
 
     The map below shows the locations of Southwest's major facilities and major
transmission lines, and principal communities to which Southwest supplies gas
either as a wholesaler or distributor. The map also shows major supplier
transmission lines that are interconnected with Southwest's systems.
 
                                     [MAP]

     [DESCRIPTION: Map of Arizona, Nevada, and southern California indicating
the location of the Company's service areas. Service areas in Arizona include
most of the central and southern areas of the state including Phoenix, Tucson,
Yuma, and surrounding communities. Service areas in northern Nevada include
Carson City, Yerington, Fallon, Lovelock, Winnemuca, and Elko. Service areas in
southern Nevada include the Las Vegas valley (including Henderson and Boulder
City), and Laughlin. Service areas in southern California include Barstow, Big
Bear, Needles, and Victorville. Service areas in northern California include
the north shore of Lake Tahoe. Companies providing gas transportation services
for the Company are indicated by showing the location of their pipelines. Major
transporters include El Paso Natural Gas Company, Kern River Gas Transmission
Company, Northwest Pipeline Corporation, and Southern California Gas Company.
The location of Paiute Pipeline Company's transmission pipeline (extending from
the Idaho/Nevada border to the Reno/Tahoe area) and the Company's pipeline
(extending from Laughlin/Bullhead City to the Las Vegas valley) are indicated.
The LNG facility is located near Lovelock, Nevada. The liquefied petroleum gas
facility is located near Reno, Nevada.]
 
                                        7
<PAGE>   10
 
     The information appearing in Part I, Item 1, page 5 with respect to the
construction services segment is incorporated herein by reference.
 
ITEM 3. LEGAL PROCEEDINGS
 
     The Company has been named as defendant in various legal proceedings. The
ultimate dispositions of these proceedings are not presently determinable;
however, it is the opinion of management that no litigation to which the Company
is subject will have a material adverse impact on its financial position or
results of operations.
 
ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS
 
     None.
 
                                    PART II
 
ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS
 
     The principal markets on which the common stock of the Company is traded
are the New York Stock Exchange and the Pacific Stock Exchange. At March 14,
1997, there were 26,967 holders of record of common stock. The market price of
the common stock was $18.75 as of March 14, 1997. The quarterly market price of
and dividends on the Company's common stock required by this item are included
in the 1996 Annual Report to Shareholders and are incorporated herein by
reference.
 
ITEM 6. SELECTED FINANCIAL DATA
 
     Information required by this item is included in the 1996 Annual Report to
Shareholders and is incorporated herein by reference.
 
ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
        OF OPERATIONS
 
     Information required by this item is included in the 1996 Annual Report to
Shareholders and is incorporated herein by reference.
 
ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
 
     The Consolidated Financial Statements of Southwest Gas Corporation and
Notes thereto, together with the report of Arthur Andersen LLP, Independent
Public Accountants, are included in the 1996 Annual Report to Shareholders and
are incorporated herein by reference.
 
ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
        FINANCIAL DISCLOSURE
 
     None.
 
                                    PART III
 
ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT
 
     (a) Identification of Directors. Information with respect to Directors is
set forth under the heading "Election of Directors" in the Company's definitive
Proxy Statement dated March 31, 1997, which by this reference is incorporated
herein.
 
                                        8
<PAGE>   11
 
     (b) Identification of Executive Officers. The name, age, position and
period position held during the last five years for each of the Executive
Officers of the Company are as follows:
 
<TABLE>
<CAPTION>
                                                                                      PERIOD
                                                                                     POSITION
        NAME          AGE                         POSITION                             HELD
        ----          ---                         --------                           --------
<S>                   <C>    <C>                                                  <C>
Michael O. Maffie     49     President and Chief Executive Officer                1993-Present
                             President and Chief Operating Officer                1992-1993
George C. Biehl       49     Senior Vice President/Chief Financial Officer and    1996-Present
                             Corporate Secretary
                             Senior Vice President and Chief Financial Officer    1992-1996
James P. Kane         50     Senior Vice President/Operations                     1997-Present
                             Vice President/Southern Arizona Division             1993-1997
                             Director/Operations Support                          1992-1993
James F. Lowman       50     Senior Vice President/Central Arizona Division       1992-Present
Dudley J. Sondeno     44     Senior Vice President/Chief Knowledge and            1993-Present
                             Technology Officer
                             Vice President/Engineering and Operations Support    1992-1993
Edward S. Zub         48     Senior Vice President/Regulation and Product         1996-Present
                             Pricing
                             Vice President/Rates & Regulation                    1992-1996
</TABLE>
 
     (c) Identification of Certain Significant Employees. None.
 
     (d) Family Relationships. None of the Company's Directors or Executive
Officers are related to any other either by blood, marriage or adoption.
 
     (e) Business Experience. Information with respect to Directors is described
in (a) above. All Executive Officers have held responsible positions with the
Company for at least five years as described in (b) above.
 
     (f) Involvement in Certain Legal Proceedings. None.
 
     (g) Promoters and Control Persons. None.
 
     Section 16(a) Beneficial Ownership Reporting Compliance. Section 16(a) of
the Securities Exchange Act of 1934 requires the Company's officers and
directors, and persons who own more than ten percent of a registered class of
the Company's equity securities, to file reports of ownership and changes in
ownership with the Securities and Exchange Commission (SEC) and the New York
Stock Exchange. Officers, directors, and beneficial owners of more than ten
percent of any class of equity securities are required by SEC regulation to
furnish the Company with copies of all Section 16(a) forms they file.
 
     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 1996,
all the required reports were filed timely.
 
ITEM 11. EXECUTIVE COMPENSATION
 
     Information with respect to executive compensation is set forth under the
heading "Executive Compensation and Benefits" in the Company's definitive Proxy
Statement dated March 31, 1997, which by this reference is incorporated herein.
 
ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT
 
     (a) Security Ownership of Certain Beneficial Owners. None.
 
     (b) Security Ownership of Management. Information with respect to security
ownership of management is set forth under the heading "Securities Ownership by
Nominees and Executive Officers" in the Company's definitive Proxy Statement
dated March 31, 1997, which by this reference is incorporated herein.
 
     (c) Changes in Control. None.
 
                                        9
<PAGE>   12
 
ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
 
     Information with respect to certain relationships and related transactions
is set forth under the heading "Certain Relationships and Related Transactions"
in the Company's definitive Proxy Statement dated March 31, 1997, which by this
reference is incorporated herein.
 
                                    PART IV
 
ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K
 
     (a) The following documents are filed as part of this report on Form 10-K:
 
        (1) The Consolidated Financial Statements of the Company (including the
            Report of Independent Public Accountants) required to be reported
            herein are incorporated by reference to the information reported in
            the Company's 1996 Annual Report under the following captions:
 
<TABLE>
                <S>                                                                       <C>
                Consolidated Balance Sheets.............................................    36
                Consolidated Statements of Income.......................................    37
                Consolidated Statements of Cash Flows...................................    38
                Consolidated Statements of Stockholders' Equity.........................    39
                Notes to Consolidated Financial Statements..............................    40
                Report of Independent Public Accountants................................    61
</TABLE>
 
        (2) All schedules have been omitted because the required information is
            either inapplicable or included in the Notes to Consolidated
            Financial Statements.
 
        (3) See List of exhibits.
 
     (b) Reports on Form 8-K.
 
     The Company filed a Form 8-K, dated November 4, 1996, filing a consent of
Arthur Andersen LLP, independent public accountants in connection with the
filing of a Form S-3 registration statement.
 
     The Company filed a Form 8-K, dated December 23, 1996, filing the ratio of
earnings to fixed charges for the twelve months ended September 30, 1996.
 
     The Company filed a Form 8-K, dated December 30, 1996, filing documents in
connection with the Company's Medium-Term Notes.
 
     The Company filed a Form 8-K, dated February 11, 1997, reporting summary
financial information for the year ended December 31, 1996.
 
     (c) See List of exhibits.
 
                                       10
<PAGE>   13
 
                                LIST OF EXHIBITS
 
<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                                   DESCRIPTION OF DOCUMENT
 -------                                  -----------------------
<S>           <C>
 2.01(17)     Agreement between Southwest Gas Corporation, The Southwest Companies and
              PriMerit Bank, Federal Savings Bank, as sellers and Norwest Corporation as
              buyer, dated April 10, 1996, regarding sale of assets and liabilities of
              PriMerit Bank.
 3(i)(5)      Restated Articles of Incorporation, as amended.
 3(ii)(10)    Amended Bylaws of Southwest Gas Corporation.
 4.01(1)      Indenture between the Company and Bank of America National Trust and Savings
              Association, as successor by merger to Security Pacific National Bank, as
              Trustee, dated August 1, 1986, with respect to the Company's 9% Series A and
              Series B and 8 3/4% Series C Debentures.
 4.02(7)      First Supplemental Indenture of the Company to Bank of America National Trust
              and Savings Association, as successor by merger to Security Pacific National
              Bank, as Trustee, dated as of October 1, 1986, supplementing and amending the
              Indenture dated as of August 1, 1986, with respect to the Company's 9%
              Debentures, Series A, due 2011.
 4.03(7)      Second Supplemental Indenture of the Company to Bank of America National Trust
              and Savings Association, as successor by merger to Security Pacific National
              Bank, as Trustee, dated as of November 1, 1986, supplementing and amending the
              Indenture dated as of August 1, 1986, with respect to the Company's 9%
              Debentures, Series B, due 2011.
 4.04(8)      Third Supplemental Indenture of the Company to Bank of America National Trust
              and Savings Association, as successor by merger to Security Pacific National
              Bank, as Trustee, dated as of December 1, 1986, supplementing and amending the
              Indenture dated as of August 1, 1986, with respect to the Company's 8 3/4%
              Debentures, Series C, due 2011.
 4.05(8)      Fourth Supplemental Indenture of the Company to Bank of America National Trust
              and Savings Association, as successor by merger to Security Pacific National
              Bank, as Trustee, dated as of February 1, 1987, supplementing and amending the
              Indenture dated as of August 1, 1986, with respect to the Company's 10%
              Debentures, Series D, due 2017.
 4.06(9)      Fifth Supplemental Indenture of the Company to Bank of America National Trust
              and Savings Association, as successor by merger to Security Pacific National
              Bank, as Trustee, dated as of August 1, 1988, supplementing and amending the
              Indenture dated as of August 1, 1986, with respect to the Company's 9 3/8%
              Debentures, Series E, due 2013.
 4.07(10)     Sixth Supplemental Indenture of the Company to Bank of America National Trust
              and Savings Association, as successor by merger to Security Pacific National
              Bank, as Trustee, dated as of June 16, 1992, supplementing and amending the
              Indenture dated as of August 1, 1986, with respect to the Company's 9 3/4%
              Debentures, Series F, due 2002.
 4.08(11)     Indenture between Clark County, Nevada, and Bank of America Nevada as Trustee,
              dated September 1, 1992, with respect to the issuance of $130,000,000
              Industrial Development Revenue Bonds (Southwest Gas Corporation), $30,000,000
              1992 Series A and $100,000,000 1992 Series B.
 4.09(12)     Indenture between Clark County, Nevada, and Harris Trust and Savings Bank as
              Trustee, dated December 1, 1993, with respect to the issuance of $75,000,000
              Industrial Development Revenue Bonds (Southwest Gas Corporation), 1993 Series
              A, due 2033.
 4.10(12)     Indenture between City of Big Bear Lake, California, and Harris Trust and
              Savings Bank as Trustee, dated December 1, 1993, with respect to the issuance
              of $50,000,000 Industrial Development Revenue Bonds (Southwest Gas Corporation
              Project), 1993 Series A, due 2028.
 4.11(22)     Indenture between the Company and Harris Trust and Savings Bank dated July 15,
              1996, with respect to the Company's Debt Securities.
</TABLE>
 
                                       11
<PAGE>   14
 
<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                                   DESCRIPTION OF DOCUMENT
 -------                                  -----------------------
<S>           <C>
 4.12(23)     First Supplement Indenture of the Company to Harris Trust and Savings Bank
              dated August 1, 1996, supplementing and amending the Indenture dated as of July
              15, 1996, with respect to the Company's 7 1/2% and 8% Debentures, due 2006 and
              2026, respectively.
 4.13(25)     Second Supplemental Indenture of the Company to Harris Trust and Savings Bank
              dated December 30, 1996, supplementing and amending the Indenture dated as of
              July 15, 1996, with respect to the Company's Medium-Term Notes.
 4.14(3)      Certificate of Trust of Southwest Gas Capital I.
 4.15(16)     Amended and Restated Declaration of Trust of Southwest Gas Capital I.
 4.16(16)     Form of Preferred Security (attached as Annex I to Exhibit A to the Amended and
              Restated Declaration of Trust of Southwest Gas Capital I included as Exhibit
              4.15 hereto).
 4.17(4)      Form of Guarantee with respect to Preferred Securities.
 4.18(15)     Southwest Gas Capital I Preferred Securities Guarantee by the Company and
              Harris Trust and Savings Bank, dated as of October 31, 1995.
 4.19(15)     Form of Subordinated Debt Security (included in the First Supplemental
              Indenture included as Exhibit 4.20 hereto).
 4.20(15)     Subordinated Debt Securities Indenture between the Company and Harris Trust and
              Savings Bank, dated as of October 31, 1995.
 4.21(15)     First Supplemental Indenture between the Company and Harris Trust and Savings
              Bank, dated as of October 31, 1995, supplementing and amending the Indenture
              dated as of October 31, 1995, with respect to the 9.125% Subordinated Debt
              Securities.
 4.22(2)      Form of Deposit Agreement.
 4.23(2)      Form of Depositary Receipt (attached as Exhibit A to Deposit Agreement included
              as Exhibit 4.22 hereto).
 4.24(18)     Rights Agreement between the Company and Harris Trust Company, as Rights Agent,
              dated as of March 5, 1996.
 4.25         The Company hereby agrees to furnish to the SEC, upon request, a copy of any
              instruments defining the rights of holders of long-term debt issued by
              Southwest Gas Corporation or its subsidiaries.
 9.01         Not applicable.
10.01(6)      Participation Agreement among the Company and General Electric Credit
              Corporation, Prudential Insurance Company of America, Aetna Life Insurance
              Company, Merrill Lynch Interfunding, Bank of America through purchase of Valley
              Bank of Nevada, Bankers Trust Company and First Interstate Bank of Nevada,
              dated as of July 1, 1982.
10.02(24)     Amended and Restated Lease Agreement between the Company and Spring Mountain
              Road Associates, dated as of July 1, 1996.
10.03(12)     Financing Agreement between the Company and Clark County, Nevada, dated
              September 1, 1992.
10.04(12)     Financing Agreement between the Company and Clark County, Nevada, dated as of
              December 1, 1993.
10.05(12)     Project Agreement between the Company and City of Big Bear Lake, California,
              dated as of December 1, 1993.
10.06(13)     Southwest Gas Corporation Executive Deferral Plan, amended and restated May 10,
              1994.
10.07(20)     Southwest Gas Corporation Directors Deferral Plan, together with first
              amendment dated March 5, 1996.
</TABLE>
 
                                       12
<PAGE>   15
 
<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                                   DESCRIPTION OF DOCUMENT
 -------                                  -----------------------
<S>           <C>
10.08(12)     Southwest Gas Corporation Board of Directors Retirement Plan, amended and
              restated effective October 1, 1993.
10.09(13)     Southwest Gas Corporation Management Incentive Plan, amended and restated May
              10, 1994.
10.10(13)     Southwest Gas Corporation Supplemental Retirement Plan, amended and restated as
              of May 10, 1994.
10.11         Form of Employment Agreement with Company officers.
10.12(14)     $200 million Credit Agreement between the Company, Union Bank of Switzerland,
              et al., dated as of January 27, 1995.
10.13(17)     Merger Agreement among the Company and Northern Pipeline Construction Co.,
              dated as of November 13, 1995.
10.14(19)     Southwest Gas Corporation 1996 Stock Incentive Plan.
11.01         Not applicable.
12.01         Computation of Ratios of Earnings to Fixed Charges and Ratios of Earnings to
              Combined Fixed Charges and Preferred Stock Dividends of the Company.
13.01         Portions of 1996 Annual Report incorporated by reference to the Form 10-K.
16.01         Not applicable.
18.01         Not applicable.
21.01         List of subsidiaries of Southwest Gas Corporation.
22.01         Not applicable.
23.01         Consent of Arthur Andersen LLP, Independent Public Accountants.
24.01         Not applicable.
27.01         Financial Data Schedule (filed electronically only).
28.01         Not applicable.
</TABLE>
 
- ---------------
 
 (1) Incorporated herein by reference to the Company's Registration Statement on
     Form S-3, No. 33-7931.
 
 (2) Incorporated herein by reference to the Company's Registration Statement on
     Form S-3, No. 33-55621.
 
 (3) Incorporated herein by reference to the Company's Registration Statement on
     Form S-3, No. 33-62143.
 
 (4) Incorporated herein by reference to the Company's Amendment No. 1 to
     Registration Statement on Form S-3, No. 33-62143.
 
 (5) Incorporated herein by reference to the Company's Registration Statement on
     Form S-3, No. 333-14605.
 
 (6) Incorporated herein by reference to the Company's report on Form 10-K for
     the year ended December 31, 1982.
 
 (7) Incorporated herein by reference to the Company's report on Form 10-K for
     the year ended December 31, 1986.
 
 (8) Incorporated herein by reference to the Company's report on Form 10-Q for
     the quarter ended March 31, 1987.
 
 (9) Incorporated herein by reference to the Company's report on Form 8-K dated
     August 23, 1988.
 
(10) Incorporated herein by reference to the Company's report on Form 10-Q for
     the quarter ended June 30, 1992.
 
(11) Incorporated herein by reference to the Company's report on Form 10-Q for
     the quarter ended September 30, 1992.
 
(12) Incorporated herein by reference to the Company's report on Form 10-K for
     the year ended December 31, 1993.
 
                                       13
<PAGE>   16
 
(13) Incorporated herein by reference to the Company's report on Form 10-Q for
     the quarter ended June 30, 1994.
 
(14) Incorporated herein by reference to the Company's report on Form 10-K for
     the year ended December 31, 1994.
 
(15) Incorporated herein by reference to the Company's report on Form 10-Q for
     the quarter ended September 30, 1995.
 
(16) Incorporated herein by reference to the Company's report on Form 8-K dated
     October 26, 1995.
 
(17) Incorporated herein by reference to the Company's report on Form 10-K for
     the year ended December 31, 1995.
 
(18) Incorporated herein by reference to the Company's report on Form 8-K dated
     March 5, 1996.
 
(19) Incorporated herein by reference to the Company's Proxy Statement dated May
     30, 1996.
 
(20) Incorporated herein by reference to the Company's report on Form 10-Q for
     the quarter ended June 30, 1996.
 
(21) Incorporated herein by reference to the Company's report on Form 8-K dated
     July 19, 1996.
 
(22) Incorporated herein by reference to the Company's report on Form 8-K dated
     July 26, 1996.
 
(23) Incorporated herein by reference to the Company's report on Form 8-K dated
     July 31, 1996.
 
(24) Incorporated herein by reference to the Company's report on Form 10-Q for
     the quarter ended September 30, 1996.
 
(25) Incorporated herein by reference to the Company's report on Form 8-K dated
     December 30, 1996.
 
                                       14
<PAGE>   17
 
                                   SIGNATURES
 
     Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.
 
                                          SOUTHWEST GAS CORPORATION
 
Date: March 26, 1997                      By      /s/ MICHAEL O. MAFFIE
                                            ------------------------------------
                                                     Michael O. Maffie,
                                               President and Chief Executive
                                                           Officer
 
     Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed below by the following persons on behalf of the
registrant and in the capacities and on the dates indicated.
 
<TABLE>
<CAPTION>
                  SIGNATURE                                 TITLE                     DATE
                  ---------                                 -----                     ----      
<C>                                             <C>                              <S>
             /s/ GEORGE C. BIEHL                    Senior Vice President,       March 26, 1997
- ---------------------------------------------    Chief Financial Officer and
              (George C. Biehl)                      Corporate Secretary
 
             /s/ EDWARD A. JANOV                Vice President, Controller and   March 26, 1997
- ---------------------------------------------      Chief Accounting Officer
              (Edward A. Janov)
</TABLE>
 
     Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Company has duly caused this report to be signed below
by the following persons on behalf of the registrant and in the capacities and
on the dates indicated.
 
<TABLE>
<CAPTION>
                  SIGNATURE                                 TITLE                     DATE
                  ---------                                 -----                     ----  
<C>                                             <C>                              <S>
           /s/ RALPH C. BATASTINI                          Director              March 26, 1997
- ---------------------------------------------
            (Ralph C. Batastini)
 
            /s/ MANUEL J. CORTEZ                           Director              March 26, 1997
- ---------------------------------------------
             (Manuel J. Cortez)

              /s/ LLOYD T. DYER                            Director              March 26, 1997
- ---------------------------------------------
               (Lloyd T. Dyer)
 
             /s/ KENNY C. GUINN                    Chairman of the Board of      March 26, 1997
- ---------------------------------------------             Directors
              (Kenny C. Guinn)
 
            /s/ THOMAS Y. HARTLEY                          Director              March 26, 1997
- ---------------------------------------------
             (Thomas Y. Hartley)
 
            /s/ MICHAEL B. JAGER                           Director              March 26, 1997
- ---------------------------------------------
             (Michael B. Jager)
 
             /s/ LEONARD R. JUDD                           Director              March 26, 1997
- ---------------------------------------------
              (Leonard R. Judd)
 
           /s/ JAMES R. LINCICOME                          Director              March 26,1997
- ---------------------------------------------
            (James R. Lincicome)
 
            /s/ MICHAEL O. MAFFIE               Director, President and Chief    March 26, 1997
- ---------------------------------------------         Executive Officer
             (Michael O. Maffie)
 
            /s/ CAROLYN M. SPARKS                          Director              March 26, 1997
- ---------------------------------------------
             (Carolyn M. Sparks)
 
             /s/ ROBERT S. SUNDT                           Director              March 26, 1997
- ---------------------------------------------
              (Robert S. Sundt)
</TABLE>
 
                                       15
<PAGE>   18
 
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
EXHIBIT
NUMBER                                  DESCRIPTION OF DOCUMENT
- ------                                  -----------------------
<C>        <S>
10.11      Form of Employment Agreement with Company officers
12.01      Computation of Ratios of Earnings to Fixed Charges and Ratios of Earnings to
           Combined Fixed Charges and Preferred Stock Dividends of the Company
13.01      Portions of 1996 Annual Report incorporated into Form 10-K
21.01      List of Subsidiaries of Southwest Gas Corporation
23.01      Consent of Arthur Andersen LLP, Independent Public Accountants
27.01      Financial Data Schedule (filed electronically only)
</TABLE>

<PAGE>   1
                                                                   EXHIBIT 10.11

                          FORM OF EMPLOYMENT AGREEMENT

      Employment Agreement ("Agreement") entered into as of the 1st day of July,
1996 between SOUTHWEST GAS CORPORATION, a California corporation (the "Company")
and ______________ ("Employee").

1.    DEFINITIONS

      For the purposes of this Agreement:

      (a)   The term "Company" shall include any corporate successor to the
            business presently conducted by the Company.

      (b)   The term "Subsidiary" shall mean any corporation, partnership, joint
            venture or other entity in which the Company has a 20% or greater
            equity interest.

      (c)   "Permanent Disability" shall mean that because of physical or mental
            illness or disability, Employee shall have been continuously unable
            to perform his duties hereunder for a consecutive period of six
            months.

      (d)   Employee shall be deemed to engage in a "Competing Business" if, in
            any capacity, including but not limited to proprietor, partner,
            officer, director or employee, he engages or participates, directly
            or indirectly, in the operation, ownership or management of any
            proprietorship, partnership, corporation or other business entity
            which is in the natural gas distribution business. Indirect
            participation in the operation or ownership of any such entity shall
            include any investment by Employee in any such entity, by way of
            loan, guarantee or stock ownership (other than ownership of 1% or
            less of any class of the entity or other securities of a company
            which is listed and regularly traded on any national securities
            exchange or which is regularly traded over-the-counter).
<PAGE>   2
2.    EMPLOYMENT: TERM OF AGREEMENT

      (a)   Employee shall perform the duties of [Officer's Title] of the
            Company and, as such, shall supervise and direct the
            activities/operation[s] of the Company and, to the extent
            practicable, its Subsidiaries. He shall continue to perform such
            additional duties related to the business and affairs of the Company
            as may be delegated to him from time to time by the Board of
            Directors of the Company (the "Board") [or the President and CEO].

      (b)   Company agrees to employ Employee and Employee agrees to serve
            Company, in accordance with the terms of this Agreement, for an
            initial term of [24 or 36] months, commencing July 1, 1996. Unless
            within 60 days prior to each anniversary date of this Agreement, the
            Company gives to Employee written notice of termination as of the
            then applicable expiration date of this Agreement, the term of this
            Agreement shall automatically be extended for an additional 12
            months. The term of this Agreement shall include any extension
            pursuant to this Paragraph 2(b).

3.    COMPENSATION

      Employee shall receive the following compensation for services during the
term of his employment hereunder:

      (a)   The Employee's minimum base salary shall be $___________ per annum,
            payable as nearly as possible in equal semi-monthly installments,
            subject to adjustment (but not below the minimum base salary
            provided above) in accordance with the regular procedures
            established by the Company for salary adjustments; and

      (b)   The Employee shall participate in: (i) any incentive


                                        2
<PAGE>   3
            compensation plan, pension or profit sharing plans, stock purchase
            plan or executive retirement plan maintained by the Company for its
            employees in accordance with the terms and conditions thereof; (ii)
            any annuity or group insurance benefit plan, medical plan and other
            welfare/ employee benefit plans maintained by the Company for its
            executive employees, in accordance with the terms and conditions
            thereof; and (iii) the Company will provide a suitable automobile
            valued at retail at approximately $___________, with the Company
            assuming the expenses for insurance, repairs and maintenance of the
            automobile.

4.    DUTIES

      Employee agrees that at all times during the term hereof, he will:

      (a)   Faithfully, industriously and to the best of his ability, experience
            and talents, perform all of the duties that may be required of and
            from him and fulfill all of his responsibilities hereunder pursuant
            to the express and explicit terms hereof, to the reasonable
            satisfaction of the Board;

      (b)   Devote all of his undivided time, attention, knowledge and skills,
            during customary business hours to the business and interests of the
            Company, subject to such holidays, personal holidays, reasonable
            vacations and sick leave as are provided under the general policies
            of the Company as they may exist from time to time;

      (c)   Comply with all the general rules and regulations of the Company;

      (d)   Not engage in a Competing Business; and

      (e)   Maintain his residence at a location within the city or in or 


                                        3
<PAGE>   4
            near a suburban community of the city in which the executive offices
            of the Company are located, or the executive offices of a Company
            division if so assigned.

5.    CONFIDENTIALITY

      Employee covenants and agrees to hold in strictest confidence, and not
disclose to any person, firm or corporation, without the express written consent
of the Company, any and all of the Company's confidential data, including but
not limited to information and documents concerning the Company's business,
customers and suppliers, market methods, files, trade secrets, or other
"know-how" or techniques or information not of a published nature which shall
come into his possession, knowledge, or custody concerning the business of the
Company, except as such disclosure may be required by law or in connection with
Employee's employment hereunder. This covenant and agreement of Employee shall
survive this Agreement and continue to be binding upon Employee after the
expiration or termination of this Agreement, whether by passage of time or
otherwise so long as such information and data shall remain confidential. 

6.    TERMINATION DUE TO DEATH OR DISABILITY

      Employee's employment with the Company shall terminate (i) upon the
Employee's death, or (ii) in the event of the Permanent Disability of Employee
upon notice in writing to the Employee to that effect.

7.    OTHER TERMINATION

       The Company may terminate this Agreement for Cause (as hereinafter
defined) upon written notice to Employee. In the event of termination by the
Company of this Agreement for Cause, Employee's salary shall immediately cease
and the Employee shall be entitled to no other payments or benefits pursuant to
this


                                        4
<PAGE>   5
Agreement, except for any vested rights Employee may have in items under
paragraph 3(b) hereof.

      Termination of this Agreement for "Cause" shall mean (i) any material
breach of any material provision of this Agreement by Employee which is not
cured within 60 days after receipt by Employee of written notice of such breach
from the Company, (ii) an adjudication that Employee is bankrupt, (iii)
conviction of Employee of a felony or crime involving moral turpitude (meaning a
crime that necessarily includes the commission of an act of gross depravity,
dishonesty or bad morals) or (iv) any acts or willful malfeasance or gross
negligence in a matter of material importance to the Company.

      Employee may terminate this Agreement for any "Good Reason" as specified
in paragraph 10 (b)(ii) without regard for whether there has been any change in
control under paragraph 10(b)(i). Such a termination by Employee shall be
treated as a termination without cause by the Company under paragraph 8.

8.    TERMINATION WITHOUT CAUSE

      Termination of the employment of Employee by the Company for reason other
than (i) death, (ii) Permanent Disability,(iii) Cause, or (iv) upon expiration
of the term of this Agreement as provided in numbered paragraph 2 hereof, shall
have the following effect:

      (a)   Any such purported termination must be on 60 days advance written
            notice to the Employee, whose employment shall continue during the
            notice period; provided, however, that at the Company's option,
            Employee may be placed on a paid administrative leave for all or any
            part of the 60 days;

      (b)   Any restricted stock awards, stock options or stock
            appreciation rights to purchase or relating to Common 


                                        5
<PAGE>   6
            Stock of the Company held by Employee on the date notice of such
            purported termination is given ("Notice Date") which are not at the
            Notice Date currently vested or exercisable shall on the Notice Date
            automatically become vested or exercisable and be exercisable for 90
            days thereafter; and

      The provisions of this paragraph 8 are not to be construed as modifying in
any way the provisions of paragraph 2 hereof, nor as granting the Company the
right to terminate the employment of the Employee other than for the permissible
reasons specified in clauses (i) through (iv) of the first sentence of this
paragraph; and the effects of such a purported termination specified in clauses
(a) and (b) hereof shall be in addition to and not in limitation of any other
rights the Employee has hereunder as a result of such purported termination.

9.    BENEFITS UPON TERMINATION OF EMPLOYEE BY COMPANY FOR REASONS OTHER THAN
      CAUSE, PERMANENT DISABILITY OR DEATH

      If Employee's employment is terminated by the Company for any reason other
than Cause, Permanent Disability or Employee's death, the Company will:

      (a)   Continue to pay Employee his base salary being paid at the time of
            notification, plus 20% of his base salary in lieu of employee
            benefits referred to in Paragraph 3(b)(ii) for the balance of the
            term of this Agreement;

      (b)   Pay Employee his incentive compensation, which shall be 60% of his
            base salary, for the balance of the term of this Agreement;

      (c)   Pay his expenses which will be normal business expenses, including
            automobile, plus any conventions, seminars or travel scheduled at
            the time of notification of


                                        6
<PAGE>   7
            termination; and

      (d)   Pay benefits under the Company's Deferred Compensation Plan and
            Supplemental Executive Retirement Plan ("SERP"), which are fully
            vested at the "Employment Termination Date", in accordance with the
            payment schedules and any applicable elections; provided, however
            that Employee shall receive additional benefits under the SERP such
            that Employee will be permitted to add to the formula for purposes
            of eligibility for benefits, vesting and calculation of benefits 10
            points which, at the election of Employee, may be applied either to
            an age assumption or continuous Length of Service assumption (e.g.,
            if an officer is 50 and has 20 years of service, he could allocate
            the points so that for purposes of eligibility, vesting and
            calculation of benefits, he is age 60 and has 20 years of service.)
            These enhanced assumptions will be applicable to Employee, including
            Employee who is so designated with the execution of this Agreement
            for purposes of eligibility, vesting and calculation of benefits.

      The termination of Employee's employment (the "Employment Termination
Date") shall be effective upon the 60th day following the notice date.

      In addition, from the Notice Date until the Benefit Termination Date (as
hereinafter defined), the Company will provide Employee with suitable office
space (equivalent to that occupied by Employee on the Notice Date) and private
secretarial services away from the Company's offices in an office complex of
Employee's choice in Las Vegas, Nevada, or the Division Headquarters City
where Employee was last assigned. The "Benefit Termination Date", 


                                        7
<PAGE>   8
shall be the date following the Employment Termination Date which is the later
of (i) the expiration of the term of his Agreement as provided in paragraph 2
hereof, or (ii) the anniversary of the Employment Termination Date.

      Provided that the Company duly performs all of its obligations arising by
virtue of a termination of Employee for reasons other than Cause, Employee will
not publicly disparage the Company or its officers, directors, employees or
agents and will refrain from any action which would reasonably be expected to
cause material adverse public relations or embarrassment to the Company or to
any of such persons. Similarly, the Company (including its officers, directors,
employees and agents) will not disparage Employee and will refrain from any
action which would reasonably be expected to result in embarrassment to Employee
or to materially and adversely affect his opportunities for employment. The
preceding two sentences shall not apply to disclosures required by applicable
law, regulation or order of court or governmental agency.

10.   CHANGE IN CONTROL OF THE COMPANY

      The Board recognizes that the continuing possibility of a change in
control of the Company is unsettling to Employee and other senior executives of
the Company. Therefore, the arrangements set forth below are being made to help
assure a continuing dedication by Employee to his duties to the Company,
notwithstanding the occurrence or potential occurrence of a change in control.
In particular, the Board believes it important, should the Company receive
proposals from third parties with respect to its future, to enable Employee,
without being influenced by the uncertainties of his own situation, to assess
and advise the Board whether such proposals would be in the best interests of
the Company and its shareholders and to take such other action


                                        8
<PAGE>   9
regarding such proposals as the Board might determine to be appropriate. The
Board also wishes to demonstrate to executives of the Company that the Company
is concerned with the welfare of its executives and intends to see that loyal
executives are treated fairly.

      In view of the foregoing and in further consideration of Employee's
continued employment with the Company, the Company agrees as follows:

      (a)   Limited Right to Receive a Severance Benefit 

            In the event that within 24 months after a Change in Control of the
            Company (as hereinafter defined), Employee terminates his employment
            with the Company for Good Reason (as hereinafter defined),
            irrespective of the period then remaining until the end of the term
            of this Agreement under paragraph 2 hereof, Employee shall be
            entitled to severance benefits provided in subparagraph (d) of this
            paragraph 10, provided he terminates his employment within 120 days
            following the occurrence of any of the events specified in (aa)
            through (dd) of subparagraph 10(b)(ii) below.

      (b)   Certain Additional Definitions

            For purposes of this Agreement:

            (i)   Change in Control. 

                  The term "Change in Control of the Company" shall mean any of
                  the following:

                  (aa)  Approval by the shareholders of the Company of the
                        dissolution or liquidation of the Company;

                  (bb)  Approval by the shareholders of the Company of an
                        agreement to merge or consolidate, or otherwise
                        reorganize, with or into one or more


                                        9
<PAGE>   10
                        entities that are not wholly owned by the Company, as a
                        result of which less than 50% of the outstanding voting
                        securities of the surviving or resulting entity
                        immediately after the reorganization are, or will be,
                        owned by shareholders of the Company immediately before
                        such reorganization (assuming for purposes of such
                        determination that there is no change in the record
                        ownership of the Company's securities from the record
                        date for such approval until such reorganization and
                        that such record owners hold no securities of the other
                        parties to such reorganization);

                  (cc)  Approval by the shareholders of the Company of the sale
                        of substantially all of the Company's business and/or
                        assets to a person or entity which is not wholly owned
                        by the Company;

                  (dd)  Any "person" (as such term is used in Sections 13(d) and
                        14(d) of the Exchange Act but excluding any person
                        described in and satisfying the conditions of Rule
                        13d-l(b)(1) thereunder), becomes the beneficial owner
                        (as defined in Rule 13d-3 under the Exchange Act),
                        directly or indirectly, of securities of the Company
                        representing more than 20% of the combined voting power
                        of the Company's then outstanding securities entitled to
                        then vote generally in the election of directors of the
                        Company; or


                                       10
<PAGE>   11
                  (ee)  A majority of the Board not being comprised of
                        Continuing Directors. For purposes of this Agreement,
                        "Continuing Directors" shall mean persons who were
                        members of the Board on the date of execution of this
                        Agreement or nominated for election or elected to the
                        Board with the affirmative vote of at least three-
                        fourths of the directors who were Continuing Directors
                        at the time of such nomination or election.

            (ii)  Good Reason

                  For purposes of this Agreement, "Good Reason" shall mean:

                  (aa)  without Employee's express written consent, the
                        assignment to him of any duties inconsistent with his
                        positions, duties, authority, responsibilities and
                        status with the Company immediately prior to a change in
                        control, or a demotion, or a change in his titles or
                        offices as in effect immediately prior to a change in
                        control, or any removal of him from or any failure to
                        re-elect him to any of such positions, except in
                        connection with the termination of his employment for
                        cause, permanent disability or retirement or as a result
                        of his death or by him other than for Good Reason;

                  (bb)  a reduction by the Company in Employee's base salary as
                        in effect on the date hereof or as the same may be
                        increased from time to time;


                                       11
<PAGE>   12
                        and

                  (cc)  the failure by the Company to continue in effect any
                        thrift, incentive or compensation plan, or any pension,
                        life insurance, health and accident or disability plan
                        in which Employee is participating at the time of a
                        change in control of the Company (or plans providing
                        Employee with substantially similar benefits), the
                        taking of any action by the Company which would
                        adversely affect Employee's participation in or
                        materially reduce his aggregate benefits under all of
                        such plans, when taken together, or deprive him of any
                        material fringe benefit enjoyed by him at the time of
                        the change in control (except for acceleration of stock
                        options or restricted stock contemplated by this
                        Agreement).

                  (dd)  assignment to a new location which would require a
                        round-trip commute to work from Employee's current
                        residence of more than 40 miles per day.

      (c)   Notice of Termination 

            Any termination by Employee under this paragraph 10 shall be
            communicated by written notice to the Company which shall set forth
            in reasonable detail the facts and circumstances claimed to provide
            a basis for such termination.

      (d)   Effect of Termination

            If Employee is entitled to receive a severance benefit 


                                       12
<PAGE>   13
            pursuant to subparagraph 10(a) hereof, the Company will provide
            Employee with only the following severance benefits:

            (i)   a severance payment equal to eighteen months of Employee's
                  yearly base salary in effect as of the date of Employee's
                  notification of termination ("Employee Notice Date"), eighteen
                  months of incentive compensation calculated as 60% of such
                  base salary, and eighteen months' fringe benefits calculated
                  as 20% of such base salary;

            (ii)  suitable office space (equivalent to that occupied by Employee
                  on the Employee's Notice Date) and private secretarial
                  services away from the Company's offices in an office complex
                  of Employee's choice in Las Vegas, Nevada or the Division
                  Headquarters City where Employee was last assigned for a
                  period equal to the earlier of (aa) the second anniversary of
                  the Employee's Notice Date, or (bb) when Employee secures
                  suitable other employment;

            (iii) the benefits specified in subparagraph 8(b) hereof, "Notice
                  Date" in said subparagraphs being deemed to be the Employee's
                  Notice Date;

            (iv)  Amounts fully vested and payable by the Company to Employee
                  under the Company's Deferred Compensation Plan and the
                  Company's Supplemental Executive Retirement Plan ("SERP") in
                  accordance with the payment schedules and any applicable
                  elections set forth under both such plans, such amounts having
                  been deposited with a trustee under an appropriate


                                       13
<PAGE>   14
                  Trust Agreement providing for a so-called Rabbi Trust
                  Arrangement pursuant to I.R.S. Rev. Proc. 92-64, as described
                  in paragraph 20; and

            (v)   Benefits under the SERP, which are fully vested at the
                  "Employment Termination Date", provided, however that Employee
                  shall receive additional benefits under the SERP such that
                  Employee will be permitted to add to the formula for purposes
                  of eligibility for benefits, vesting and calculation of
                  benefits 10 points which, at the election of Employee, may be
                  applied either to an age assumption or a Continuous Length of
                  Service assumption. [See Paragraph 9(d) for illustration.]

11.   RESTRICTIVE COVENANT

      In consideration of the Company's agreements contained herein and the
payments to be made by it to Employee pursuant hereto, Employee agrees that,
during the period of his employment hereunder and for a further period expiring
12 months following the date of termination of this Agreement or any extensions
or renewal thereof, Employee will not, without the written consent of the Board
of Directors of the Company, engage in a Competing Business within the
geographical limits of any state (or such lesser geographical area as may be set
by a court of competent jurisdiction) in which any of the businesses of the
Company are being conducted on the date of any such termination. Employee
acknowledges and agrees that a breach by Employee of the provisions of this
section will constitute such damage as will be irreparable and the exact amount
of which will be impossible to ascertain and, for that reason, agrees that the
Company will be entitled to an injunction to be issued by any court of competent
jurisdiction restraining and


                                       14
<PAGE>   15
enjoining Employee from violating the provisions of this paragraph. The right of
an injunction shall be in addition to and not in lieu of any other remedy
available to the Company for such breach or threatened breach, including the
recovery of damages from Employee.

      Termination of this Agreement, whether by passage of time or any other
cause, shall not constitute a waiver of the Company's rights under this
paragraph 11, nor a release of Employee from his obligations thereunder.

12.   ARBITRATION AND LITIGATION

      In the event the Company terminates Employee by reason of his Permanent
Disability or for Cause and Employee disputes the accuracy of the assertion of
Permanent Disability or Cause, or in the event Employee terminates his
employment for Good Reason following a Change in Control of the Company and the
Company disputes the accuracy of such assertion of Good Reason, the accuracy of
such assertion shall be submitted to arbitration in accordance with the then
current commercial arbitration rules of the American Arbitration Association
("Association") or its successor, provided Employee or the Company files a
written demand for arbitration at a regional office of the Association within 30
calendar days following the date the Employee notifies the Company that he
disputes the accuracy of the assertion of Permanent Disability or Cause, or the
Company notifies Employee that it disputes the accuracy of the assertion of Good
Reason. In the event the Arbitrator finds that the termination by the Company
was not for Permanent Disability or not for Cause or that the termination by the
Employee was for Good Reason, Employee shall not be entitled to reinstatement,
but shall be entitled to the benefits of paragraphs 8 and 9 hereof (in the case
of termination by the Company) and paragraph 10 hereof (in the case of
termination by the


                                       15
<PAGE>   16
Employee) and, in either case, payment of his reasonable legal expenses in such
arbitration. In the event the Company shall elect to insure all or part of its
liability for providing health and long-term disability benefits under this
paragraph, Employee shall submit to such reasonable physical examination as the
Company may request.

      Should Employee at any time bring suit against the Company for breach of
this Agreement (not including any matter required to be submitted to arbitration
pursuant to the foregoing provisions of this paragraph 12) and obtain judgment
in his favor, the Company shall pay his reasonable legal expenses and costs of
suit.

13.   BENEFIT AND BINDING EFFECT

      This Agreement shall inure to the benefit of and be binding upon the
Company, its successors and assigns, including but not limited to any
corporation, person or other entity which may acquire all or substantially all
of the assets and business of the Company or any corporation with or into which
the Company may be consolidated or merged and Employee, his heirs, executors,
administrators and legal representatives, provided that the obligations of
Employee hereunder may not be delegated.

14.   OTHER AGREEMENTS OF EMPLOYEE

      Employee represents that the execution and performance of this Agreement
will not result in a breach of any of the terms and conditions of any employment
or other agreement between the Employee and any third party.

15.   NOTICES

      All notices hereunder shall be in writing and delivered personally or sent
by registered or certified mail, postage prepaid:

      If to the Company, to: Southwest Gas Corporation


                                       16
<PAGE>   17
                                    P.O. Box 98510
                                    Las Vegas, Nevada 89193-8510
                                    Attn: General Counsel

      If to the Employee, to:       [Employee's Name]
                                    [Address]
                                    [City, State Zip Code]

Either party may change the address to which notices are to be sent to it by
giving 10 days' written notice of such change of address to the other party in
the manner above provided for giving notice. Notices will be considered
delivered on the date of personal delivery or on the date of deposit in the
United States mail in the manner provided for giving notice by mail.

16.   PARACHUTE PAYMENTS

      If any "payment" (as defined below) hereunder constitutes a "parachute
payment" (as defined in Section 280G(b)(2)(A) of the Internal Revenue Code of
1986, as amended (herein the "Code") or the Treasury Regulations thereunder),
then the maximum amount of all such "payments" to be made under this Agreement
to or for the benefit of Employee shall not be limited by the amount the Company
is entitled to deduct under the Code, but the Employee shall pay any excise tax
which is imposed upon the amount by which such "payments" exceed three times the
Employee's "base amount" (as defined in Section 280G(b)(3)(A) of the Code and
the Regulations thereunder). For purposes of this section, to the extent
required by the Code, the term "payment" shall include any transfer of property
(including, without limitation, the acceleration of vesting of stock options
under Section 8(b) hereof, and the lapse of all restrictions on Common Stock
held by Employee under the Company's Restricted Stock Plans pursuant to Section
8(b) hereof), 


                                       17
<PAGE>   18
with all such property transfers being taken into account at their fair market
value in accordance with the provisions of Section 280G(d)(3)(B) of the Code and
the Regulations thereunder. If Employee elects to litigate any characterization
by the Internal Revenue Service of a payment as a "parachute payment", the
Company will join Employee in such litigation if the Company's General Counsel
determines in good faith that Employee's position has substantial merit and that
the issues should be litigated from the standpoint of the Company's best
interest.

17.   ENTIRE AGREEMENT

      The entire understanding and agreement between the parties has been
incorporated into this Agreement, and this Agreement supersedes all other
agreements and understandings between Employee and the Company with respect to
the employment of Employee by the Company.

18.   GOVERNING LAW

      This Agreement shall be governed by and interpreted in accordance with the
laws of the State of Nevada.

19.   CAPTIONS

      The captions included herein are for convenience and shall not constitute
a part of this Agreement.

20.   FUNDING OF SEVERANCE BENEFITS PAYABLE UNDER PARAGRAPH 10

      The method of providing funding for the amounts payable under paragraph 10
shall be by way of a Rabbi Trust. Such trust shall be established by the Company
with either (i) a major bank located in a major city of the United States or
(ii) any other party located in a major city of the United States that may be
granted corporate trustee powers under state law, in favor of Employee. Such
trust shall not be revocable and shall continue until such trust is terminated
in accordance with the termination provisions set forth 


                                       18
<PAGE>   19
in the Trust Agreement described in paragraph 10.


      IN WITNESS WHEREOF, the Employment Agreement has been executed by the
parties hereto in counterparts, each of which shall be deemed an original, as of
the date first above written.

ATTEST:                             SOUTHWEST GAS CORPORATION

____________________                By:________________________________
Thomas J. Trimble                   Michael O. Maffie
Corporate Secretary                 President and Chief Executive Officer
                                    For COMPANY

                                    ___________________________________
                                    [EMPLOYEE]


                                       19

<PAGE>   1
 
                                                                   EXHIBIT 12.01
 
                           SOUTHWEST GAS CORPORATION
 
               COMPUTATION OF RATIOS OF EARNINGS TO FIXED CHARGES
                             (THOUSANDS OF DOLLARS)
 
<TABLE>
<CAPTION>
                                                           FOR THE YEAR ENDED DECEMBER 31,
                                                   -----------------------------------------------
                                                    1996      1995      1994      1993      1992
                                                   -------   -------   -------   -------   -------
<S>                                                <C>       <C>       <C>       <C>       <C>
CONTINUING OPERATIONS
  1. Fixed charges:
     A) Interest expense.........................  $54,674   $52,844   $48,688   $40,883   $35,533
     B) Amortization.............................    1,494     1,569     1,426     1,330     1,183
     C) Interest portion of rentals..............    6,629     4,435     4,743     4,556     4,468
     D) Preferred securities distributions.......    5,475       913        --        --        --
                                                   -------   -------   -------   -------   -------
          Total fixed charges....................  $68,272   $59,761   $54,857   $46,769   $41,184
                                                   =======   =======   =======   =======   =======
  2. Earnings (as defined):
     E) Pretax income from continuing
       operations................................  $ 6,574   $ 3,493   $38,119   $21,959   $49,752
     Fixed Charges (1. above)....................   68,272    59,761    54,857    46,769    41,184
                                                   -------   -------   -------   -------   -------
          Total earnings as defined..............  $74,846   $63,254   $92,976   $68,728   $90,936
                                                   =======   =======   =======   =======   =======
  3. Ratio of earnings to fixed charges..........     1.10      1.06      1.69      1.47      2.21
                                                   =======   =======   =======   =======   =======
</TABLE>
 
<TABLE>
<CAPTION>
                                                          FOR THE YEAR ENDED DECEMBER 31,
                                                  ------------------------------------------------
                                                   1996      1995       1994      1993      1992
                                                  -------   -------   --------   -------   -------
<S>                                               <C>       <C>       <C>        <C>       <C>
ADJUSTED FOR INTEREST ALLOCATED TO DISCONTINUED
  OPERATIONS
  1. Fixed charges:
     A) Interest expense........................  $54,674   $52,844   $ 48,688   $40,883   $35,533
     B) Amortization............................    1,494     1,569      1,426     1,330     1,183
     C) Interest portion of rentals.............    6,629     4,435      4,743     4,556     4,468
     D) Preferred securities distributions......    5,475       913         --        --        --
     E) Allocated interest......................       --     9,636      7,874     7,874     7,333
                                                  -------   -------    -------   -------   -------
          Total fixed charges...................  $68,272   $69,397   $ 62,731   $54,643   $48,517
                                                  =======   =======    =======   =======   =======
  2. Earnings (as defined):
     F) Pretax income from continuing
       operations...............................  $ 6,574   $ 3,493   $ 38,119   $21,959   $49,752
     Fixed Charges (1. above)...................   68,272    69,397     62,731    54,643    48,517
                                                  -------   -------    -------   -------   -------
          Total earnings as defined.............  $74,846   $72,890   $100,850   $76,602   $98,269
                                                  =======   =======    =======   =======   =======
  3. Ratio of earnings to fixed charges.........     1.10      1.00       1.61      1.40      2.03
                                                  =======   =======    =======   =======   =======
</TABLE>
<PAGE>   2
 
                                                                   EXHIBIT 12.01
 
                           SOUTHWEST GAS CORPORATION
 
               COMPUTATION OF RATIOS OF EARNINGS TO FIXED CHARGES
                            AND PREFERRED DIVIDENDS
                             (THOUSANDS OF DOLLARS)
 
<TABLE>
<CAPTION>
                                                       FOR THE YEAR ENDED DECEMBER 31,
                                           -------------------------------------------------------
                                            1996        1995        1994        1993        1992
                                           -------     -------     -------     -------     -------
<S>                                        <C>         <C>         <C>         <C>         <C>
CONTINUING OPERATIONS
  1. Combined fixed charges:
     A) Total fixed charges..............  $68,272     $59,761     $54,857     $46,769     $41,184
     B) Preferred dividends[1]...........    --            404         826       1,183       1,623
                                           -------     -------     -------     -------     -------
          Total fixed charges and
            preferred dividends..........  $68,272     $60,165     $55,683     $47,952     $42,807
                                           =======     =======     =======     =======     =======
  2. Earnings............................  $74,846     $63,254     $92,976     $68,728     $90,936
                                           =======     =======     =======     =======     =======
  3. Ratio of earnings to fixed charges
     and preferred dividends.............     1.10        1.05        1.67        1.43        2.12
                                           =======     =======     =======     =======     =======
</TABLE>
 
<TABLE>
<CAPTION>
                                                      FOR THE YEAR ENDED DECEMBER 31,
                                          --------------------------------------------------------
                                           1996        1995         1994        1993        1992
                                          -------     -------     --------     -------     -------
<S>                                       <C>         <C>         <C>          <C>         <C>
ADJUSTED FOR INTEREST ALLOCATED TO
  DISCONTINUED OPERATIONS
  1. Combined fixed charges:
     A) Total fixed charges.............  $68,272     $69,397     $ 62,731     $54,643     $48,517
     B) Preferred dividends.............    --            404          826       1,183       1,623
                                          -------     -------     --------     -------     -------
          Total fixed charges and
            preferred dividends.........  $68,272     $69,801     $ 63,557     $55,826     $50,140
                                          =======     =======     ========     =======     =======
  2. Earnings...........................  $74,846     $72,890     $100,850     $76,602     $98,269
                                          =======     =======     ========     =======     =======
  3. Ratio of earnings to fixed charges
     and
       preferred dividends..............     1.10        1.04         1.59        1.37        1.96
                                          =======     =======     ========     =======     =======
</TABLE>
 
- ---------------
[1] Preferred and preference dividends have been adjusted to represent the
    pretax earnings necessary to cover such dividend requirements.

<PAGE>   1
 
CONSOLIDATED SELECTED FINANCIAL STATISTICS
 
(Thousands of dollars, except per share amounts)
 
<TABLE>
<CAPTION>
      Year Ended December 31,            1996           1995          1994          1993          1992
- ---------------------------------------------------------------------------------------------------------
<S>                                   <C>            <C>           <C>           <C>           <C>
Operating revenues                    $   644,061    $  563,502    $   599,553   $  539,105    $  534,390
Operating expenses                        572,488       505,090        510,863      461,423       448,815
- ---------------------------------------------------------------------------------------------------------
Operating income                      $    71,573    $   58,412    $    88,690   $   77,682    $   85,575
=========================================================================================================  
Income from continuing operations     $     6,574    $    2,654    $    23,524   $   13,751    $   32,214
Income (loss) from discontinued
  operations, net of tax (1)                   --       (17,536)         2,777        1,655       (14,553)
- ---------------------------------------------------------------------------------------------------------
Net income (loss)                     $     6,574    $  (14,882)   $    26,301   $   15,406    $   17,661
=========================================================================================================  
Net income (loss) applicable to
  common stock                        $     6,574    $  (15,189)   $    25,791   $   14,665    $   16,610
=========================================================================================================    
Total assets at year end              $ 1,560,269    $1,532,527    $ 1,453,582   $1,362,861    $1,265,380
=========================================================================================================    
Capitalization at year end
  Common equity                       $   379,616    $  356,050    $   348,556   $  335,117    $  329,444
  Preferred and preference stocks              --            --          4,000        8,058        15,316
  Trust originated preferred
    securities                             60,000        60,000             --           --            --
  Long-term debt                          665,221       607,945        678,263      568,600       589,883
- ---------------------------------------------------------------------------------------------------------  
                                      $ 1,104,837    $1,023,995    $ 1,030,819   $  911,775    $  934,643
=========================================================================================================    
Common stock data
  Return on average common equity            1.8%        (4.1)%           7.6%         4.4%          5.1%
  Earnings (loss) per share
    Continuing operations             $      0.25    $     0.10    $      1.09   $     0.63    $     1.51
    Discontinued operations                    --         (0.76)          0.13         0.08         (0.70)
- ---------------------------------------------------------------------------------------------------------  
  Earnings (loss) per share           $      0.25    $    (0.66)   $      1.22   $     0.71    $     0.81
=========================================================================================================    
  Dividends paid per share            $      0.82    $     0.82    $      0.80   $     0.74    $     0.70
  Payout ratio                                N/A           N/A            66%         104%           86%
  Book value per share at year end    $     14.20    $    14.55    $     16.38   $    15.96    $    15.99
  Market value per share at year
    end                               $     19.25    $    17.63    $     14.13   $    16.00    $    13.75
  Market value per share to book
    value per share                          136%          121%            86%         100%           86%
  Common shares outstanding at year
    end (000)                              26,733        24,467         21,282       20,997        20,598
  Number of common shareholders at
    year end                               26,371        25,133         20,765       21,851        22,943
Ratio of earnings to fixed charges
  Continuing operations                      1.10          1.06           1.69         1.47          2.21
  Adjusted for interest allocated
    to discontinued operations               1.10          1.05           1.61         1.40          2.03
</TABLE>
 
- ------------------------------
(1) Contribution from Financial Services Segment, including 1995 loss on sale of
    the Bank.
<PAGE>   2
 
NATURAL GAS OPERATIONS
 
(Thousands of dollars)
 
<TABLE>
<CAPTION>
      Year Ended December 31,            1996           1995          1994          1993          1992
- ---------------------------------------------------------------------------------------------------------
<S>                                   <C>            <C>           <C>           <C>           <C>
Sales                                 $   506,200    $  524,914    $  560,207    $  503,789    $  506,937
Transportation                             40,161        38,588        39,061        34,361        27,190
Other                                          --            --           285           955           263
- ---------------------------------------------------------------------------------------------------------  
Operating revenue                         546,361       563,502       599,553       539,105       534,390
Net cost of gas purchased                 187,580       227,456       249,922       212,290       214,293
- ---------------------------------------------------------------------------------------------------------  
Operating margin                          358,781       336,046       349,631       326,815       320,097
Expenses
  Operations and maintenance              198,364       187,969       178,310       169,921       159,954
  Depreciation and amortization            67,443        62,492        57,284        55,088        52,277
  Other                                    28,156        27,173        25,347        24,124        22,291
- ---------------------------------------------------------------------------------------------------------  
Operating income                      $    64,818    $   58,412    $   88,690    $   77,682    $   85,575
=========================================================================================================    
Contribution to consolidated net
  income (loss)                       $     3,919    $    2,654    $   23,524    $   13,751    $   32,214
=========================================================================================================    
Total assets at year end              $ 1,498,099    $1,357,034    $1,277,727    $1,194,679    $1,103,794
=========================================================================================================    
Net gas plant at year end             $ 1,278,457    $1,137,750    $1,035,916    $  954,488    $  906,420
=========================================================================================================    
Construction expenditures and
  property additions                  $   210,742    $  166,183    $  141,390    $  113,903    $  102,517
=========================================================================================================    
Cash flow, net
  From operating activities           $    47,931    $   97,754    $   84,074    $   50,437    $   81,457
  From investing activities               (41,804)     (163,718)     (141,547)     (116,246)     (103,065)
  From financing activities               (11,456)       71,056        61,422        67,488        (7,792)
- ---------------------------------------------------------------------------------------------------------  
Net change in cash                    $    (5,329)   $    5,092    $    3,949    $    1,679    $  (29,400)
=========================================================================================================    
Total throughput (thousands of
  therms)
  Sales                                   818,329       805,884       881,868       850,557       825,521
  Transportation                          968,208     1,016,011       914,791       725,023       651,141
- ---------------------------------------------------------------------------------------------------------  
Total throughput                        1,786,537     1,821,895     1,796,659     1,575,580     1,476,662
=========================================================================================================    
Weighted average cost of gas
  purchased ($/therm)                 $      0.27    $     0.21    $     0.30    $     0.29    $     0.26
Customers at year end                   1,092,000     1,029,000       980,000       932,000       897,000
Employees at year end                       2,424         2,383         2,359         2,318         2,285
Degree days -- actual (1)                   1,896         1,781         2,091         2,097         1,908
Degree days -- ten year average (1)         2,033         2,021         2,068         2,064         2,043
</TABLE>
 
- ------------------------------
(1) Prior years degree days are adjusted to reflect the current year customer
    mix by rate jurisdiction.
<PAGE>   3
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
AND RESULTS OF OPERATIONS
 
      The following discussion of Southwest Gas Corporation and subsidiaries
(the Company) includes information related to its regulated natural gas
transmission and distribution activities and nonregulated activities. Also
discussed is the sale of PriMerit Bank, Federal Savings Bank (the Bank), which
is reported as discontinued operations.
 
CONTINUING OPERATIONS
 
      The Company is principally engaged in the business of purchasing,
transporting, and distributing natural gas (Southwest or natural gas operations
segment). Southwest is the largest distributor in Arizona, selling and
transporting natural gas in most of southern, central, and northwestern Arizona,
including the Phoenix and Tucson metropolitan areas. Southwest is also the
largest distributor and transporter of natural gas in Nevada, and serves the Las
Vegas metropolitan area and northern Nevada. In addition, Southwest distributes
and transports natural gas in portions of California, including the Lake Tahoe
area in northern California and high desert and mountain areas in San Bernardino
County.
      As of December 31, 1996, Southwest had 1,092,000 residential, commercial,
industrial, and other customers, of which 633,000 customers were located in
Arizona, 346,000 in Nevada, and 113,000 in California. Residential and
commercial customers represented over 99 percent of the total customer base.
During 1996, Southwest added 63,000 customers, a six percent increase, of which
28,000 customers were added in Arizona, 29,000 in Nevada, and 6,000 in
California. Customer growth over the past three years averaged five percent
annually. These additions are largely attributed to population growth in the
service areas. Based on current commitments from builders, customer growth is
expected to approximate five percent in 1997. During 1996, 56 percent of
operating margin was earned in Arizona, 34 percent in Nevada, and 10 percent in
California. These patterns are consistent with prior years and are expected to
continue.
      In April 1996, the Company acquired all of the outstanding stock of
Northern Pipeline Construction Co. (Northern or construction services segment)
pursuant to a definitive agreement dated November 1995. The Company issued
approximately 1,439,000 shares of common stock valued at $24 million in
connection with the acquisition. The acquisition was accounted for as a
purchase. Goodwill in the amount of approximately $10 million was recorded by
Northern and is being amortized over a period of approximately 25 years.
Northern provides utility companies with trenching and installation,
replacement, and maintenance services for energy distribution systems.
 
DISCONTINUED OPERATIONS
 
      In January 1996, the Company signed a definitive agreement to sell the
Bank to Norwest Corporation for $175 million. The original agreement specified a
sale of Bank stock, however, the agreement provided for an alternative
permitting Norwest to purchase assets and assume liabilities. In April 1996,
Norwest elected the asset purchase alternative.
<PAGE>   4
 
      The disposition of the Bank resulted in a net loss of $13 million, which
included a pretax book loss of $3.1 million plus income taxes of $9.9 million.
The income taxes resulted because the Company's tax basis in the Bank was lower
than its book basis. The net loss was reported as loss on disposal of a
discontinued segment in the consolidated financial statements.
      Shareholders of the Company voted on and approved the principal terms of
the sale at the annual meeting held in July 1996. The sale closed in July 1996.
Net proceeds of $163 million were used to pay down debt.
 
CAPITAL RESOURCES AND LIQUIDITY
 
      The capital requirements and resources of the Company generally are
determined independently for the natural gas operations and construction
services segments. Each business activity is generally responsible for securing
its own financing sources. The capital requirements and resources of the
construction services segment are not material to the overall capital
requirements and resources of the Company.
      Southwest has been and continues to experience unprecedented population
growth throughout its service territories. This growth has required large
amounts of capital to finance the investment in infrastructure, in the form of
new transmission and distribution plant, to satisfy consumer demand. For
example, during the three-year period ended December 31, 1996, total gas plant
increased from $1.3 billion to $1.7 billion, or at an annual rate of nine
percent. More than 80 percent of 1996 construction expenditures represent new
construction and the balance represents costs associated with routine
replacement of existing transmission, distribution, and general plant.
      The investment in gas plant has required capital resources in excess of
the amount of cash flow generated from operating activities (net of dividends
paid). During 1996, capital expenditures were $211 million. Cash flow from
operating activities (net of dividends) provided $27 million of the required
capital resources pertaining to these construction expenditures. The remainder
was provided from net external financing activities. Normally, internally
generated funds provide a larger proportionate share of capital resources
required for construction expenditures. However, cash flows from operating
activities were unfavorably impacted in 1996 by warmer than normal weather and
unusually high working capital requirements.
      Southwest estimates construction expenditures during the three-year period
ending December 31, 1999 will be approximately $468 million. It is currently
estimated that cash flow from operating activities (net of dividends) will fund
approximately one-half of the gas operations' total construction expenditures
for the three-year period ending December 31, 1999. A portion of the
construction expenditure funding will be provided by $30 million of funds held
in trust at December 31, 1996, from the issuance of industrial development
revenue bonds. The remaining cash requirements are expected to be provided by
external financing sources. The timing, types, and amounts of these additional
external financings will be dependent on a number of factors, including
conditions in the capital markets, timing and amounts of rate relief, and growth
factors in
<PAGE>   5
 
Southwest's service areas. These external financings may include the issuance of
both debt and equity securities, bank and other short-term borrowings, and other
forms of financing. Due to the significant size of the current construction
program, differences between estimated and actual results are expected to occur.
Actual events, and the timing of those events, frequently do not occur as
expected, and can impact, favorably or unfavorably, anticipated cash flows.
      In August 1996, the Company issued $75 million of 7 1/2 percent debentures
due 2006 and $75 million of 8 percent debentures due 2026. Net proceeds of $148
million as well as a portion of the $163 million net proceeds from the PriMerit
sale were used to refund or retire $219 million of outstanding callable
debentures and pay down short-term debt. The remaining amount was used for
general corporate purposes, including the acquisition of property for the
construction, completion, extension, and improvement of Southwest's pipeline
systems. The refinancing achieved a 126 basis point reduction in the related
average interest rate.
      In October 1996, the Company filed a $250 million shelf registration
statement. In connection with this new registration statement, the Company may
offer, up to the registered amount, any combination of debt securities,
preferred stock, depositary shares, and common stock. This registration
statement includes a carryforward of $60 million remaining from a prior shelf
registration statement declared effective by the Securities and Exchange
Commission in October 1995. The Company filed a prospectus supplement in
December 1996 identifying $150 million of the shelf as medium-term notes. In
January 1997, the Company issued $25 million of 7.59 percent notes due January
2017. In February 1997, the Company issued $25 million of 7.78 percent notes due
February 2022.
      Liquidity refers to the ability of an enterprise to generate adequate
amounts of cash to meet its cash requirements. General factors that could
significantly affect capital resources and liquidity in future years include
inflation, growth in the economy, changes in income tax laws, the level of
natural gas prices, interest rates, and changes in the ratemaking policies of
regulatory commissions.
      Cash flows from operating activities were significantly affected during
the current year by warm weather and increases in the cost of gas during the
fourth quarter of 1996. In prior periods, operating cash flow was greater due to
a cost of gas which was generally lower than the rate authorized to be
recovered, resulting in an amount payable to ratepayers. However, during the
fourth quarter of 1996, gas costs increased resulting in costs exceeding
authorized recovery rates. See additional discussion regarding the deferred
purchased gas adjustment (PGA) mechanism below. Cash flows used in investing
activities were significantly impacted by increased construction expenditures
and the sale of the Bank. Financing activities include use of proceeds from the
Bank sale to retire debt issued in connection with the Company's investment in
the Bank, as well as the refinancing of a significant portion of long-term debt.
      Southwest's rate schedules in all of its service areas contain PGA clauses
which permit adjustments to rates as the cost of purchased gas changes. The PGA
mechanism allows Southwest to
<PAGE>   6
 
change the gas cost component of the rates charged to its customers to reflect
increases or decreases in the price expected to be paid to its suppliers and
companies providing interstate pipeline transportation service. In addition,
Southwest uses this mechanism to either refund amounts overcollected or recoup
amounts undercollected as compared to the price paid for natural gas during the
period since the last PGA rate change went into effect. Generally, Southwest's
tariffs provide for annual adjustment dates for changes in purchased gas costs.
In addition, Southwest may request to adjust its rates more often than once each
year, if conditions warrant. These changes have no direct impact on profit
margin.
      While the changes relating to PGA have no direct net income impact, cash
flows are impacted. At December 31, 1995, Southwest had a purchased gas cost
liability of $32.8 million, reflecting a cumulative overcollection of rates paid
by customers versus payments to suppliers and pipelines. However, as a result of
refunds and gas price increases, particularly in the fourth quarter of 1996, the
overcollection from customers was reduced to $9.4 million at December 31, 1996,
a $23.4 million change during the twelve-month period. The following table shows
the most recent PGA changes authorized by rate jurisdiction (thousands of
dollars):
 
<TABLE>
<CAPTION>
                                                   Annualized
                                                    Revenue                       Effective
                  Jurisdiction                     Adjustment     Percentage         Date
- ---------------------------------------------------------------------------------------------
<S>                                                <C>            <C>            <C>
Arizona:
  Central and Southern                              $(20,900)         (17)%       August 1995
California:
  Northern                                          $    900           18%       October 1993
  Southern                                          $  4,300            9%        August 1996
Nevada:
  Northern                                          $ (4,000)          (9)%         July 1996
  Southern                                          $(10,100)          (8)%         July 1996
</TABLE>
 
      In October 1996, Southwest submitted an out-of-period PGA filing, in
compliance with its last general rate case order, with the Public Service
Commission of Nevada (PSCN) which would have resulted in an annual revenue
decrease of $700,000 in the southern Nevada rate jurisdiction and an increase of
$500,000 in the northern Nevada rate jurisdiction. However, as a result of the
fourth quarter increases in the amounts paid by Southwest for natural gas
procured on behalf of its sales customers, Southwest filed a revised PGA request
in January 1997. If approved as filed, the proposed revisions would result in
annual increases of $16.4 million, or 16 percent, in the southern Nevada rate
jurisdiction and $6 million, or 15 percent, in the northern Nevada rate
jurisdiction. The change was requested to become effective in the second quarter
of 1997.
      In November 1996, in conjunction with the filing of a general rate case,
Southwest filed a PGA change with the Arizona Corporation Commission (ACC) which
would have resulted in an annual
<PAGE>   7
 
revenue decrease of $26.4 million, or eight percent. As a result of the increase
in the amount paid for natural gas in the fourth quarter of 1996, Southwest
alerted the ACC in January 1997 of the circumstances contributing to the
increases.
      The Company has established a common stock dividend policy which states
that common stock dividends will be paid at a prudent level that is within the
normal dividend payout range for its respective businesses, and that the
dividend will be established at a level considered sustainable in order to
minimize business risk and maintain a strong capital structure throughout all
economic cycles. The Company's quarterly common stock dividend was 20.5 cents
per share throughout 1996.
      Securities ratings issued by nationally recognized ratings agencies
provide a method for determining the credit worthiness of an issuer. The
Company's debt ratings are important because long-term debt constitutes a
significant portion of total capitalization. These debt ratings are a factor
considered by lenders when determining the cost of debt for the Company (i.e.,
the better the rating, the lower the cost to borrow funds).
      In July 1996, Moody's upgraded the Company's unsecured long-term debt
rating from Baa3 to Baa2. Moody's debt ratings range from Aaa (best quality) to
C (lowest quality). Moody's applies a Baa2 rating to obligations which are
considered medium grade obligations (i.e., they are neither highly protected nor
poorly secured).
      Also in July 1996, Duff & Phelps Credit Rating Co. upgraded the Company's
unsecured long-term debt rating to BBB from BBB-. Duff & Phelps debt ratings
range from AAA (highest rating possible) to DD (defaulted debt obligation). The
Duff & Phelps rating of BBB indicates that the Company's credit quality is
considered prudent for investment.
      The Company's unsecured long-term debt rating from Standard and Poor's
(S&P) is BBB-. S&P debt ratings range from AAA (highest rating possible) to D
(obligation is in default). According to S&P, the BBB- rating indicates the debt
is regarded as having an adequate capacity to pay interest and repay principal.
      A securities rating is not a recommendation to buy, sell, or hold a
security and is subject to change or withdrawal at any time by the rating
agency.
      The impact of inflation on results of operation has diminished in recent
years. Natural gas, labor, and construction costs are the categories most
significantly impacted by inflation. Changes to Southwest's cost of gas are
generally recovered through PGA mechanisms and do not significantly impact net
earnings. Labor is a component of the cost of service, and construction costs
are the primary component of rate base. In order to recover increased costs, and
earn a fair return on rate base, general rate cases are filed by Southwest, when
deemed necessary, for review and approval by its regulatory authorities.
Regulatory lag, that is, the time between the date increased costs are incurred
and the time such increases are recovered through the ratemaking process, can
impact earnings. See RATES AND REGULATORY PROCEEDINGS for discussion of recent
rate case proceedings.
<PAGE>   8
 
CONSOLIDATED RESULTS OF OPERATIONS
 
<TABLE>
<CAPTION>
                Contribution to Net Income
                  Year Ended December 31,                     1996         1995        1994
- ---------------------------------------------------------------------------------------------
                                                                  (Thousands of dollars)
<S>                                                          <C>         <C>          <C>
Continuing operations:
  Natural gas operations                                     $ 3,919     $  2,654     $23,524
  Construction services                                        2,655           --          --
- ---------------------------------------------------------------------------------------------
                                                               6,574        2,654      23,524
Discontinued operations -- financial services                     --      (17,536)      2,777
- ---------------------------------------------------------------------------------------------
Net income (loss)                                            $ 6,574     $(14,882)    $26,301
=============================================================================================
</TABLE>
 
1996 vs. 1995
 
      Earnings per share for the year ended December 31, 1996 were $0.25, a
$0.15 increase from $0.10 per share of earnings from continuing operations
recorded for the year ended December 31, 1995. Current-year earnings were
composed of $0.15 per share from natural gas operations and $0.10 per share from
construction services. Average shares outstanding increased by 2.7 million
shares between years. This increase is the result of a 1.4 million share
issuance in April 1996 to acquire Northern, a public offering in May 1995 and
issuances under the Company's Dividend Reinvestment and Stock Purchase Plan.
 
1995 vs. 1994
 
      Loss per share for the year ended December 31, 1995 was $0.66, a $1.88
decline from earnings per share of $1.22 recorded for the year ended December
31, 1994. The loss was composed of per share earnings of $0.10 from natural gas
operations and a per share loss of $0.76 from discontinued operations. Average
shares outstanding increased by 2.1 million shares between years primarily
resulting from a 2.1 million share public offering in May 1995. Dividends paid
in 1995 were $0.82 per share reflecting the first full year of the dividend
increase authorized by the Board in 1994.
<PAGE>   9
 
RESULTS OF NATURAL GAS OPERATIONS
 
<TABLE>
<CAPTION>
                Year Ended December 31,                     1996          1995         1994
- ---------------------------------------------------------------------------------------------
                                                                (Thousands of dollars)
<S>                                                       <C>           <C>          <C>
Gas operating revenues                                     $546,361     $563,502     $599,553
Net cost of gas                                             187,580      227,456      249,922
- ---------------------------------------------------------------------------------------------
  Operating margin                                          358,781      336,046      349,631
Operations and maintenance expense                          198,364      187,969      178,310
Depreciation and amortization                                67,443       62,492       57,284
Taxes other than income taxes                                28,156       27,173       25,347
- ---------------------------------------------------------------------------------------------
  Operating income                                           64,818       58,412       88,690
Other income (expense), net                                    (760)        (652)      (1,110)
- ---------------------------------------------------------------------------------------------
  Income before interest and income taxes                    64,058       57,760       87,580
Net interest deductions                                      53,971       53,354       49,461
Preferred securities distributions                            5,475          913           --
Income tax expense                                            1,274          839       14,595
- ---------------------------------------------------------------------------------------------
  Net income before allocations                               3,338        2,654       23,524
Allocation of carrying costs, net of tax                        581           --           --
- ---------------------------------------------------------------------------------------------
  Contribution to consolidated net income                  $  3,919     $  2,654     $ 23,524
=============================================================================================
</TABLE>
 
1996 vs. 1995
 
      Contribution to consolidated net income increased $1.3 million from 1995.
The increase was due to an increase of operating income, partially offset by an
increase in financing costs between periods.
      Weather was the dominant factor affecting the financial performance of the
gas segment in both years. Nevada experienced its second hottest year on record
in 1996 while Arizona experienced one of its hottest years on record. Warm
weather was particularly prevalent in the fourth quarter of 1995 and the first
quarter of 1996. As a result, operating margin was approximately $23 million
less than anticipated during 1996, and $28 million less than anticipated during
1995.
      Despite the warm weather, operating margin increased $22.7 million, or
seven percent, in 1996 when compared to 1995. Rate relief and record customer
growth contributed to the improvement between periods. Effective July 1996,
Southwest received a $13.8 million general rate increase applicable to its
Nevada rate jurisdictions, providing $5 million in additional operating margin
in
<PAGE>   10
 
1996. During 1996, Southwest added 63,000 customers, resulting in approximately
$13 million of additional operating margin. This continues a growth trend which
has resulted in nearly 300,000 new customers during the 1990's. Approximately 30
percent of Southwest's current customer base has been added during this period.
      Operations and maintenance expenses increased $10.4 million, or six
percent, reflecting increases in labor and maintenance costs, including the
incremental expenses associated with meeting the needs of Southwest's growing
customer base.
      Depreciation expense and taxes other than income taxes increased $5.9
million, or seven percent, as a result of additional plant in service. Average
gas plant in service increased $142 million, or nine percent, during the current
period. This is attributable to the upgrade of existing operating facilities and
the expansion of the system to accommodate customer growth.
      Financing costs during the current year increased $5.2 million from 1995.
The increase is attributable primarily to the $60 million issuance of preferred
securities in October 1995. The current year reflects the full annual cost of
these securities. Financing activities also included the refunding or retirement
of a significant portion of the Company's outstanding debentures with the
proceeds from the sale of $150 million of debentures and proceeds from the Bank
sale. During 1996, average debt outstanding decreased $18 million and consisted
of an $11 million decrease in long-term debt and a $7 million decrease in
short-term debt. Interest rates were generally lower on variable-rate debt.
 
1995 vs. 1994
 
      Contribution to consolidated net income decreased $20.9 million from 1994.
The decrease was primarily attributed to a decrease in operating margin between
periods. Increased operating costs and net interest deductions also contributed
to the decrease.
      Operating margin decreased $13.6 million, or four percent, during 1995
compared to 1994. Record-breaking warm weather throughout Southwest's service
territories for much of the 1995 heating seasons was the primary factor
influencing the change. Temperatures in the Southwest were significantly above
normal in January, February, November and December, the prime heating months. As
a result, operating margin was approximately $28 million less than would be
expected if normal weather had been experienced. However, record customer growth
and rate relief in southern Arizona and California partially mitigated the
negative impact of warmer weather, contributing an additional $15 million of
operating margin between years. During 1995, 49,000 new customers were added, an
increase of 5 percent.
      Operations and maintenance expenses increased $9.7 million, or five
percent, reflecting increases in labor and maintenance costs, including the
incremental expenses associated with meeting the needs of Southwest's growing
customer base.
<PAGE>   11
 
      Depreciation expense and taxes other than income taxes increased $7
million, or nine percent, primarily due to an increase in average gas plant in
service of $130 million, or nine percent. This is attributable to capital
expenditures for the upgrade of existing operating facilities and the expansion
of the system to accommodate customer growth.
      Net interest deductions increased $3.9 million, or eight percent, in 1995,
after deducting interest costs associated with discontinued operations. The
change is attributed to an overall increase in average debt outstanding during
1995 of six percent, which consisted of a $70 million net increase in average
long-term debt offset by a $27 million decrease in average short-term debt. The
increase in long-term debt is attributed to the draw down of IDRB funds
previously held in trust and replacement of the $165 million term facilities
with a new $200 million term loan facility. The proceeds from the common stock
issuance in May 1995 and the preferred securities issuance in October 1995 are
the primary factors for the decrease in average short-term debt. Higher interest
rates on variable-rate debt also contributed to the increase in net interest
deductions.
 
RATES AND REGULATORY PROCEEDINGS
 
California
 
      In January 1994, Southwest filed a general rate application to increase
annual margin by $1.1 million. In December 1994, the California Public Utilities
Commission (CPUC) approved the $1.1 million increase as part of a settlement
agreement, effective January 1995. The settlement, which is in effect through
1998, suspended the supply adjustment mechanism (SAM) previously utilized and
implemented a form of performance-based ratemaking. SAM was a mechanism by which
actual margin was adjusted to the margin authorized in the Southwest tariff.
Although still cost of service based, the settlement allows Southwest to retain
all margin generated from additional volumes sold, but places Southwest at risk
for reductions in margin resulting from lower than projected sales volumes. The
settlement suspends required annual attrition filings for southern California,
but retains attrition adjustments in northern California for certain
safety-related improvements. In addition, no sharing or penalty mechanisms are
required to capture efficiency gains or losses during the settlement period.
 
Nevada
 
      In December 1995, Southwest filed general rate cases with the PSCN seeking
approval to increase revenues by $15.8 million, or 12 percent, annually for its
southern Nevada rate jurisdiction and $5 million, or 10 percent, annually for
its northern Nevada rate jurisdiction. Southwest was seeking recovery of
increased operating and maintenance costs, construction-related financing, tax,
insurance, and depreciation expenses associated with its expanding customer
base. In April 1996, the PSCN approved a settlement of the general rate cases
providing Southwest with a $10.6 million
<PAGE>   12
 
general rate increase in southern Nevada and a $3.2 million increase in northern
Nevada. The settlement achieved a number of rate design and tariff restructuring
changes resulting in rates that more closely reflect the true costs of serving
the various customer classes. Over 86 percent of annual margin is now
recoverable from core customers classes, those most responsible for the
increased operating costs. The settlement adjusts rate design by equalizing
margins earned from sales and transportation customers, resulting in consistent
margin regardless of the type of service chosen by a customer. The settlement
also specifies a moratorium on future general rate increase requests until April
1999. The new rates became effective July 1, 1996.
 
Arizona
 
      In November 1996, Southwest filed a general rate application with the ACC
seeking approval to increase revenues by $49.3 million annually for both of its
Arizona rate jurisdictions. Southwest is seeking rate relief for increased
operating costs, changes in financing costs, and improvements and additions to
the distribution system. The rate application also proposes a number of rate
design improvements including consolidation of the southern and central Arizona
rate jurisdictions and better matching of rates with the costs of servicing
various customer classes. The exact amount of rate relief that will ultimately
be authorized is not known. Absent successful negotiation of a settlement, the
hearing process is scheduled to begin in the third quarter of 1997 and no
changes in rates are expected prior to January 1998.
 
FERC
 
      In July 1996, Paiute Pipeline Company, a wholly owned subsidiary of the
Company, filed a general rate case with the Federal Energy Regulatory Commission
(FERC) seeking approval to increase revenues by $6.9 million annually. Paiute is
seeking rate relief for increased costs associated with transmission system
additions and improvements, higher depreciation rates, operating cost increases
including labor, and an increase in the allowed rate of return. Interim rates
reflecting the increased revenues became effective in January 1997, subject to
refund until a final order is issued. The exact amount of rate relief that will
ultimately be authorized is not known. In the event a settlement can be reached,
a final order could be received by the end of 1997. Under normal procedural
schedules, final rates would become effective by the second or third quarter of
1998.
<PAGE>   13
 
RESULTS OF CONSTRUCTION SERVICES OPERATIONS
 
      For the eight months ended December 31, 1996, the construction services
segment contributed $2.7 million to consolidated net income. This included peak
construction season revenues and profits which are not indicative of results
expected during a twelve-month period. Construction activity is seasonal with
work generally scheduled for the spring through fall months in colder climate
areas, such as the Midwest. In warmer climate areas, such as the southwestern
United States, construction occurs year round. Construction revenues during 1996
were $97.7 million. The related costs of construction were $88.6 million,
resulting in gross profit of $9.1 million. Labor and equipment costs are the
primary components of construction costs. General and administrative expenses
were $2.1 million and interest expense was $942,000. Comparative information is
not included since Northern was acquired in April 1996.
 
RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS
 
      In June 1996, the Financial Accounting Standards Board (FASB) issued
Statement of Financial Accounting Standards (SFAS) No. 125, "Accounting for
Transfers and Servicing of Financial Assets and Extinguishments of Liabilities,"
which establishes consistent accounting and reporting standards as they relate
to transfers and servicing of financial assets and liability extinguishments.
SFAS No. 125 became effective on January 1, 1997. The Company does not
anticipate any material effects to the financial statements as a result of SFAS
No. 125. In February 1997, the FASB issued SFAS No. 128, "Earnings Per Share,"
and SFAS No. 129, "Disclosure of Information about Capital Structure." Both
statements become effective for 1997 year-end financial statements.
 
COMMON STOCK PRICE AND DIVIDEND INFORMATION
 
<TABLE>
<CAPTION>
                                          1996                 1995             Dividends Paid
                                   -----------------     -----------------     -----------------
                                     HIGH      LOW         High      Low        1996       1995
- ------------------------------------------------------------------------------------------------
<S>                                <C>       <C>         <C>       <C>         <C>        <C>
First Quarter                      $18 5/8   $15 5/8     $15 1/4   $13 5/8     $0.205     $0.205
Second Quarter                      17 3/8    15 3/4      14 7/8    13 5/8      0.205      0.205
Third Quarter                       18 3/8    14 7/8      16 3/4    14          0.205      0.205
Fourth Quarter                      19 7/8    17 3/8      18 3/8    14 7/8      0.205      0.205
                                                                               -----------------
                                                                               $0.820     $0.820
                                                                               =================
</TABLE>
 
      The principal markets on which the common stock of the Company is traded
are the New York Stock Exchange and the Pacific Stock Exchange. At March 14,
1997 there were 26,967 holders of record of common stock. The market price of
the common stock was $18 3/4 as of March 14, 1997.
<PAGE>   14
 
CONSOLIDATED BALANCE SHEETS
 
(Thousands of dollars, except par value)
 
<TABLE>
<CAPTION>
                             December 31,                                   1996             1995
- ----------------------------------------------------------------------------------------------------
<S>                                                                      <C>              <C>
                                               ASSETS
Utility plant
  Gas plant                                                               $1,732,405      $1,579,665
  Less: accumulated depreciation                                            (505,984)       (474,891)
  Acquisition adjustments                                                      5,866           6,298
  Construction work in progress                                               46,170          26,678
- ----------------------------------------------------------------------------------------------------
    Net utility plant (Note 2)                                             1,278,457       1,137,750
- ----------------------------------------------------------------------------------------------------
Other property and investments                                                71,245          35,128
- ----------------------------------------------------------------------------------------------------
Current assets
  Cash and cash equivalents                                                    8,280          11,168
  Accounts receivable, net of allowances (Note 3)                             69,000          38,186
  Accrued utility revenue                                                     46,500          43,900
  Deferred tax benefit (Note 10)                                               8,009          17,089
  Prepaids and other current assets                                           28,029          31,386
  Net assets of discontinued operations (Note 14)                                 --         175,493
- ----------------------------------------------------------------------------------------------------
    Total current assets                                                     159,818         317,222
- ----------------------------------------------------------------------------------------------------
Deferred charges and other assets (Note 4)                                    50,749          42,427
- ----------------------------------------------------------------------------------------------------
Total assets                                                              $1,560,269      $1,532,527
====================================================================================================
                                   CAPITALIZATION AND LIABILITIES
Capitalization
  Common stock, $1 par (authorized -- 45,000,000 shares; issued and
    outstanding -- 26,732,688 and 24,467,499 shares)                      $   28,363      $   26,097
  Additional paid-in capital                                                 349,132         312,631
  Retained earnings                                                            2,121          17,322
- ----------------------------------------------------------------------------------------------------
    Total common equity                                                      379,616         356,050
  Company-obligated mandatorily redeemable preferred securities of the
    Company's subsidiary, Southwest Gas Capital I, holding solely
    $61.8 million principal amount of 9.125% subordinated notes of the
    Company due 2025 (Note 5)                                                 60,000          60,000
  Long-term debt, less current maturities (Note 6)                           665,221         607,945
- ----------------------------------------------------------------------------------------------------
    Total capitalization                                                   1,104,837       1,023,995
- ----------------------------------------------------------------------------------------------------
Commitments and contingencies (Note 8)
Current liabilities
  Current maturities of long-term debt (Note 6)                                6,675         120,000
  Short-term debt (Note 7)                                                   121,000          37,000
  Accounts payable                                                            49,951          41,864
  Customer deposits                                                           21,133          21,406
  Accrued taxes                                                                9,977          29,116
  Accrued interest                                                             9,800          11,107
  Deferred purchased gas costs (Note 4)                                        9,432          32,776
  Other current liabilities                                                   33,369          36,942
- ----------------------------------------------------------------------------------------------------
    Total current liabilities                                                261,337         330,211
- ----------------------------------------------------------------------------------------------------
Deferred income taxes and other credits
  Deferred income taxes and investment tax credits (Note 10)                 152,063         138,893
  Other deferred credits (Note 4)                                             42,032          39,428
- ----------------------------------------------------------------------------------------------------
    Total deferred income taxes and other credits                            194,095         178,321
- ----------------------------------------------------------------------------------------------------
Total capitalization and liabilities                                      $1,560,269      $1,532,527
====================================================================================================
</TABLE>
 
The accompanying notes are an integral part of these statements.
<PAGE>   15
 
CONSOLIDATED STATEMENTS OF INCOME
 
(In thousands, except per share amounts)
 
<TABLE>
<CAPTION>
                Year Ended December 31,                     1996         1995         1994
- --------------------------------------------------------------------------------------------
<S>                                                       <C>          <C>          <C>
Operating revenues:
  Gas operating revenues                                  $546,361     $563,502     $599,553
  Construction revenues                                     97,700           --           --
- --------------------------------------------------------------------------------------------
     Total operating revenues                              644,061      563,502      599,553
- --------------------------------------------------------------------------------------------
Operating expenses:
  Net cost of gas                                          187,580      227,456      249,922
  Operations and maintenance                               198,364      187,969      178,310
  Depreciation and amortization                             73,699       62,492       57,284
  Taxes other than income taxes                             28,156       27,173       25,347
  Construction expenses                                     84,689           --           --
- --------------------------------------------------------------------------------------------
     Total operating expenses                              572,488      505,090      510,863
- --------------------------------------------------------------------------------------------
Operating income                                            71,573       58,412       88,690
- --------------------------------------------------------------------------------------------
Other income and (expenses):
  Net interest deductions                                  (54,913)     (53,354)     (49,461)
  Preferred securities distributions (Note 5)               (5,475)        (913)          --
  Other income (deductions), net                              (737)        (652)      (1,110)
- --------------------------------------------------------------------------------------------
     Total other income and (expenses)                     (61,125)     (54,919)     (50,571)
- --------------------------------------------------------------------------------------------
Income from continuing operations before income taxes       10,448        3,493       38,119
Income tax expense (Note 10)                                 3,874          839       14,595
- --------------------------------------------------------------------------------------------
Net income from continuing operations                        6,574        2,654       23,524
- --------------------------------------------------------------------------------------------
Discontinued operations (Note 14):
  Income (loss) from discontinued segment, net of tax
     expense (benefit) of $0, $(2,306) and $3,127               --       (4,513)       2,777
  Loss on disposal of discontinued segment, including
     tax expense of $9,900 in 1995                              --      (13,023)          --
- --------------------------------------------------------------------------------------------
Net income (loss) from discontinued operations                  --      (17,536)       2,777
- --------------------------------------------------------------------------------------------
Net income (loss)                                            6,574      (14,882)      26,301
Preferred/preference stock dividend requirements                --          307          510
- --------------------------------------------------------------------------------------------
Net income (loss) applicable to common stock              $  6,574     $(15,189)    $ 25,791
============================================================================================
Earnings per share from continuing operations             $   0.25     $   0.10     $   1.09
Earnings (loss) per share from discontinued operations          --        (0.76)        0.13
- --------------------------------------------------------------------------------------------
Earnings (loss) per share of common stock (Note 13)       $   0.25     $  (0.66)    $   1.22
============================================================================================
Average number of common shares outstanding                 25,888       23,167       21,078
============================================================================================
</TABLE>
 
The accompanying notes are an integral part of these statements.
<PAGE>   16
 
CONSOLIDATED STATEMENTS OF CASH FLOWS
 
(Thousands of dollars)
 
<TABLE>
<CAPTION>
                   Year Ended December 31,                        1996          1995          1994
- ----------------------------------------------------------------------------------------------------
<S>                                                             <C>           <C>           <C>
CASH FLOW FROM OPERATING ACTIVITIES:
  Net income (loss)                                             $  6,574      $(14,882)     $ 26,301
  Adjustments to reconcile net income (loss) to net cash
    provided by operating activities:
    Depreciation and amortization                                 73,699        62,492        57,284
    Deferred income taxes                                         17,453       (15,314)       (9,178)
    Changes in current assets and liabilities:
       Accounts receivable                                       (17,886)       19,719        (6,487)
       Accrued utility revenue                                    (2,600)        3,633        (1,300)
       Deferred purchased gas costs                              (23,344)       47,995         9,014
       Accounts payable                                            4,964        (7,101)       (2,811)
       Accrued taxes                                             (19,139)      (13,820)       11,594
       Other current assets and liabilities                        2,498         3,661         6,681
    Other                                                          9,976          (205)          649
    Undistributed (income) loss from discontinued operations          --        11,576        (7,673)
- ----------------------------------------------------------------------------------------------------
    Net cash provided by operating activities                     52,195        97,754        84,074
- ----------------------------------------------------------------------------------------------------
CASH FLOW FROM INVESTING ACTIVITIES:
  Construction expenditures and property additions              (218,835)     (166,183)     (141,390)
  Proceeds from bank sale                                        191,662            --            --
  Other                                                          (22,112)        2,465          (157)
- ----------------------------------------------------------------------------------------------------
    Net cash used in investing activities                        (49,285)     (163,718)     (141,547)
- ----------------------------------------------------------------------------------------------------
CASH FLOW FROM FINANCING ACTIVITIES:
  Issuance of common stock                                        18,110        44,844         4,773
  Issuance of trust originated preferred securities                   --        57,713            --
  Reacquisition of preferred/preference stocks                        --        (4,000)       (4,058)
  Dividends paid                                                 (21,311)      (19,575)      (17,411)
  Issuance of long-term debt                                     164,876        49,407        73,000
  Retirement of long-term debt                                  (248,531)       (2,285)         (648)
  Issuance (repayment) of short-term debt                         81,058       (55,000)        6,000
  Other                                                               --           (48)         (234)
- ----------------------------------------------------------------------------------------------------
    Net cash provided by (used in) financing activities           (5,798)       71,056        61,422
- ----------------------------------------------------------------------------------------------------
  Change in cash and temporary cash investments                   (2,888)        5,092         3,949
  Cash at beginning of period                                     11,168         6,076         2,127
- ----------------------------------------------------------------------------------------------------
  Cash at end of period                                         $  8,280      $ 11,168      $  6,076
====================================================================================================
Supplemental information:
  Interest paid, net of amounts capitalized                     $ 60,008      $ 62,377      $ 55,167
  Income taxes paid, net of refunds                             $ 18,682      $ 20,413      $  3,574
</TABLE>
 
The accompanying notes are an integral part of these statements.
<PAGE>   17
 
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
 
(In thousands, except per share amounts)
 
<TABLE>
<CAPTION>
                                              Common Stock     Additional
                                            ----------------    Paid-in     Retained
                                            Shares   Amount     Capital     Earnings    Total
- -----------------------------------------------------------------------------------------------
<S>                                         <C>      <C>       <C>          <C>        <C>
December 31, 1993                           20,997   $22,627    $268,725    $ 43,765   $335,117
Common stock issuances                         285       285       4,488                  4,773
Net income                                                                    26,301     26,301
Dividends declared
  Preferred: $9.50 per share                                                    (437)      (437)
  Second preference: $3.00 per share                                             (73)       (73)
  Common: $0.81 per share                                                    (17,125)   (17,125)
Redemption of second preference stock                                  4          (4)        --
- -----------------------------------------------------------------------------------------------
December 31, 1994                           21,282    22,912     273,217      52,427    348,556
Common stock issuances                       3,185     3,185      41,659                 44,844
Issuance costs, preferred securities                              (2,287)                (2,287)
Net loss                                                                     (14,882)   (14,882)
Dividends declared
  Preferred: $9.50 per share                                                    (307)      (307)
  Common: $0.82 per share                                                    (19,826)   (19,826)
Redemption of preferred stock                                         42         (90)       (48)
- -----------------------------------------------------------------------------------------------
December 31, 1995                           24,467    26,097     312,631      17,322    356,050
Common stock issuances                       2,266     2,266      36,501                 38,767
Net income                                                                     6,574      6,574
Dividends declared
  Common: $0.82 per share                                                    (21,775)   (21,775)
- -----------------------------------------------------------------------------------------------
December 31, 1996                           26,733*  $28,363    $349,132    $  2,121   $379,616
===============================================================================================
</TABLE>
 
* At December 31, 1996, 1.4 million common shares were registered and available
  for issuance under provisions of the Employee Investment Plan and the
  Company's Dividend Reinvestment and Stock Purchase Plan.
 
The accompanying notes are an integral part of these statements.
<PAGE>   18
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
NOTE 1 -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
      Nature of Operations.  Southwest Gas Corporation and subsidiaries (the
Company) is principally engaged in the business of purchasing, transporting, and
distributing natural gas to customers in portions of Arizona, Nevada, and
California (Southwest or the natural gas operations segment). Southwest's public
utility rates, practices, facilities, and service territories are subject to
regulatory oversight. The timing and amount of rate relief can materially impact
results of operations. Natural gas sales are seasonal, peaking during the winter
months. Variability in weather from normal temperatures can materially impact
results of operations. The Company also provides, through Northern Pipeline
Construction Co. (Northern or the construction services segment), local gas
distribution companies with installation, replacement, and maintenance services
for underground natural gas distribution systems.
      Basis of Presentation.  The Company follows generally accepted accounting
principles (GAAP) in accounting for all of its businesses. Accounting for the
natural gas utility operations conforms with GAAP as applied to regulated
companies and as prescribed by federal agencies and the commissions of the
various states in which the utility operates. The preparation of the financial
statements in conformity with GAAP requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements and the reported amounts of revenue and expenses during the reporting
period. Actual results could differ from those estimates.
      Consolidation.  The accompanying financial statements are presented on a
consolidated basis and include the accounts of Southwest Gas Corporation and all
wholly owned subsidiaries. All significant intercompany balances and
transactions have been eliminated with the exception of transactions between
Southwest and Northern. Statement of Financial Accounting Standards (SFAS) No.
71, "Accounting for the Effects of Certain Types of Regulation," provides that
intercompany profits on sales to regulated affiliates should not be eliminated
in consolidation if the sales price is reasonable and if future revenues
approximately equal to the sales price will result from the rate-making process.
Management believes these two criteria will be met. The financial services
segment is classified as discontinued operations.
      Net Utility Plant.  Net utility plant includes gas plant at original cost,
less the accumulated provision for depreciation and amortization, plus the
unamortized balance of acquisition adjustments. Original cost includes
contracted services, material, payroll and related costs such as taxes and
benefits, general and administrative expenses, and an allowance for funds used
during construction less contributions in aid of construction.
      Deferred Purchased Gas Costs.  Southwest is authorized by the various
regulatory authorities having jurisdiction to adjust its billing rates for
changes in the cost of gas purchased. The difference
<PAGE>   19
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 
 
between the current cost of gas purchased and the cost of gas recovered in
billed rates is deferred. Generally, these deferred amounts are recovered or
refunded within one year.
      Income Taxes.  The Company uses the asset and liability method of
accounting for income taxes. Under the asset and liability method, deferred tax
assets and liabilities are recognized for the future tax consequences
attributable to differences between the financial statement carrying amounts of
existing assets and liabilities and their respective tax bases. Deferred tax
assets and liabilities are measured using enacted tax rates expected to apply to
taxable income in the years in which those temporary differences are expected to
be recovered or settled. The effect on deferred tax assets and liabilities of a
change in tax rates is recognized in the period that includes the enactment
date.
      For regulatory and financial reporting purposes, investment tax credits
(ITC) related to gas utility operations are deferred and amortized over the life
of related fixed assets.
      Gas Operating Revenues.  Revenues are recorded when customers are billed.
Customer billings are based on monthly meter reads and are calculated in
accordance with applicable tariffs. Southwest also recognizes accrued utility
revenues for the estimated amount of services rendered between the meter-reading
dates in a particular month and the end of such month.
      Construction Revenues.  The majority of Northern's contracts are performed
under unit price contracts. These contracts state prices per unit of
installation. Revenues are recorded as installations are completed. Fixed-price
contracts use the percentage of completion method of accounting and, therefore,
take into account the cost, estimated earnings, and revenue to date on contracts
not yet completed. The amount of revenue recognized is based on costs expended
to date relative to anticipated final contract costs. Revisions in estimates of
cost and earnings during the course of the work are reflected in the accounting
period in which the facts requiring revision become known. If a loss on a
contract becomes known or is anticipated, the entire amount of the estimated
ultimate loss is recognized at that time in the financial statements.
      Depreciation and Amortization.  Utility plant depreciation is computed on
the straight-line remaining life method at composite rates considered sufficient
to amortize costs over estimated service lives, including components which
adjust for salvage value and removal costs, as approved by the appropriate
regulatory agency. When plant is retired from service, the original cost of
plant, including costs of removal, less salvage, is charged to the accumulated
provision for depreciation. Acquisition adjustments are amortized, as ordered by
regulatory bodies, over periods which approximate the remaining estimated life
of the acquired properties. Costs related to refunding utility debt and debt
issuance expenses are deferred and amortized over the weighted average lives of
the new issues. Nonutility property and equipment are depreciated on a
straight-line method based on the estimated useful lives of the related assets.
<PAGE>   20
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
      Allowance for Funds Used During Construction (AFUDC).  AFUDC represents
the cost of both debt and equity funds used to finance utility construction.
AFUDC is capitalized as part of the cost of utility plant. The Company
capitalized $1.8 million, $1.2 million, and $805,000 of AFUDC related to natural
gas utility operations for each of the years ended December 31, 1996, 1995, and
1994, respectively. The debt portion of AFUDC is reported in the consolidated
statements of income as an offset to net interest deductions and the equity
portion is reported as other income. Utility plant construction costs, including
AFUDC, are recovered in authorized rates through depreciation when completed
projects are placed into operation, and general rate relief is requested and
granted.
      Earnings Per Common Share.  Earnings per common share are calculated by
dividing net income (loss) applicable to common stock by the weighted average
number of shares outstanding during the period. Common stock equivalents (stock
options and performance shares) are immaterial and are not included in the
earnings per share calculation.
      Cash Flows.  For purposes of reporting consolidated cash flows, cash and
cash equivalents include cash on hand and financial instruments with a maturity
of three months or less, but exclude funds held in trust for industrial
development revenue bonds.
 
NOTE 2 -- UTILITY PLANT
 
      Net utility plant as of December 31, 1996 and 1995 was as follows
(thousands of dollars):
 
<TABLE>
<CAPTION>
                          December 31,                                1996           1995
- --------------------------------------------------------------------------------------------
<S>                                                                <C>            <C>
Gas plant:
  Storage                                                          $    3,216     $   14,546
  Transmission                                                        150,898        143,989
  Distribution                                                      1,360,438      1,206,503
  General                                                             179,795        179,378
  Other                                                                38,058         35,249
- --------------------------------------------------------------------------------------------
                                                                    1,732,405      1,579,665
Less: accumulated depreciation                                       (505,984)      (474,891)
Acquisition adjustment, net                                             5,866          6,298
Construction work in progress                                          46,170         26,678
- --------------------------------------------------------------------------------------------
  Net gas utility property                                         $1,278,457     $1,137,750
============================================================================================
</TABLE>
 
      Depreciation expense on gas plant was $66.9 million, $62 million, and
$56.5 million during the years ended December 31, 1996, 1995, and 1994,
respectively.
      Leases and Rentals.  The Company leases the liquefied natural gas (LNG)
facilities on its northern Nevada system, a portion of its corporate
headquarters office complex in Las Vegas, and its administrative offices in
Phoenix. The leases provide for current terms which expire in 2003, 2017, and
2004, respectively, with optional renewal terms available at the expiration
dates. The rental
<PAGE>   21
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 
 
payments for the LNG facilities are $6.7 annually and $43.3 million in the
aggregate. The rental payments for the corporate headquarters office complex are
$2.4 million in 1997, $1.8 million for each year 1998 through 2001, and $31.9
million thereafter. The rental payments for the Phoenix administrative offices
are $1.3 million in 1997, $1.2 million for each year 1998 through 2000, $1.3
million in 2001, and $3.6 million cumulatively thereafter. These leases are
accounted for as operating leases and are treated as such for regulatory
purposes. Rentals included in operating expenses with respect to these leases
were $11.6 million in 1994, $11.3 million in 1995, and $11.1 million in 1996.
Other operating leases of the Company are immaterial individually and in the
aggregate.
      Effective for fiscal years beginning January 1, 1996, SFAS No. 121,
"Accounting for the Impairment of Long-Lived Assets and for Long-Lived Assets to
Be Disposed Of," requires the review of long-lived assets for impairment
whenever events or changes in circumstances indicate that the carrying amount of
an asset may not be recoverable. The adoption of this standard did not have a
material impact on the Company's current financial condition or results of
operations.
 
NOTE 3 -- RECEIVABLES AND RELATED ALLOWANCES
 
      Business activity with respect to gas utility operations is conducted with
customers located within the three-state region of Arizona, Nevada, and
California. At December 31, 1996, gas segment receivables were $46.3 million.
Approximately 58 percent of the gas utility customers were in Arizona, 32
percent in Nevada, and 10 percent in California. Although the Company seeks to
minimize its credit risk related to utility operations by requiring security
deposits from new customers, imposing late fees, and actively pursuing
collection on certain accounts, some accounts are ultimately not collected.
Provisions for uncollectible accounts are recorded monthly, as needed, and are
included in the ratemaking process as a cost of service. Activity in the
allowance for uncollectibles is summarized as follows (thousands of dollars):
 
<TABLE>
<CAPTION>
                                                                               Allowance for
                                                                               Uncollectibles
- ---------------------------------------------------------------------------------------------
<S>                                                                            <C>
Balance, December 31, 1993                                                           $ 1,683
  Additions charged to expense                                                         1,445
  Accounts written off, less recoveries                                               (1,575)
- --------------------------------------------------------------------------------------------
Balance, December 31, 1994                                                             1,553
  Additions charged to expense                                                         1,295
  Accounts written off, less recoveries                                               (1,621)
- --------------------------------------------------------------------------------------------
Balance, December 31, 1995                                                             1,227
  Additions charged to expense                                                         1,285
  Accounts written off, less recoveries                                               (1,002)
- --------------------------------------------------------------------------------------------
Balance, December 31, 1996                                                           $ 1,510
============================================================================================
</TABLE>
<PAGE>   22
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 
 
NOTE 4 -- REGULATORY ASSETS AND LIABILITIES
 
      Natural gas operations are subject to the regulation of the Arizona
Corporation Commission (ACC), the Public Service Commission of Nevada (PSCN),
the California Public Utilities Commission (CPUC), and the Federal Energy
Regulatory Commission (FERC). The Company's accounting policies conform to
generally accepted accounting principles applicable to rate-regulated
enterprises and reflect the effects of the ratemaking process. Such effects
concern mainly the time at which various items enter into the determination of
net income in accordance with the principle of matching costs with related
revenues.
      The following table represents existing regulatory assets and liabilities
(thousands of dollars):
 
<TABLE>
<CAPTION>
                             December 31,                                1996         1995
- --------------------------------------------------------------------------------------------
<S>                                                                     <C>         <C>
Regulatory assets:
  SFAS No. 109 -- Income taxes, net                                     $11,431     $ 13,211
  Unamortized premium on reacquired debt                                 17,440       10,848
  Other                                                                  16,601       15,686
- --------------------------------------------------------------------------------------------
                                                                         45,472       39,745
Regulatory liabilities:
  Supplier and other rate refunds due customers                          (3,828)      (4,844)
  Deferred purchased gas costs                                           (9,432)     (32,776)
  Other                                                                  (2,204)      (3,389)
- --------------------------------------------------------------------------------------------
Net regulatory assets (liabilities)                                     $30,008     $ (1,264)
============================================================================================
</TABLE>
 
NOTE 5 -- PREFERRED STOCK AND PREFERRED SECURITIES
 
      In December 1995, the Company redeemed all remaining outstanding $100
Cumulative Preferred Stock, 9.5% Series. Scheduled annual mandatory redemption
requirements were 8,000 shares, or $800,000 per year, through 1999. After the
1995 annual mandatory redemption requirement was satisfied, the Company
exercised its option to redeem an additional 8,000 shares at par. The remaining
24,000 shares were redeemed at $102 per share, plus accrued and unpaid
dividends. The stock was redeemed because other less costly financing options
were available.
      Preferred Securities of Southwest Gas Capital I.  In October 1995,
Southwest Gas Capital I (the Trust), a consolidated wholly owned subsidiary of
the Company, issued $60 million of 9.125% Trust Originated Preferred Securities
(the Preferred Securities). In connection with the Trust's issuance of the
Preferred Securities and the related purchase by the Company of all of the
Trust's common securities (the Common Securities), the Company issued to the
Trust $61.8 million principal amount of its 9.125% Subordinated Deferrable
Interest Notes, due 2025 (the Subordinated Notes). The sole assets of the Trust
are and will be the Subordinated Notes. The interest and other payment dates on
the Subordinated Notes correspond to the distribution and other payment dates
<PAGE>   23
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
on the Preferred Securities and Common Securities. Under certain circumstances,
the Subordinated Notes may be distributed to the holders of the Preferred
Securities and holders of the Common Securities in liquidation of the Trust. The
Subordinated Notes are redeemable at the option of the Company on or after
December 31, 2000, at a redemption price of $25 per Subordinated Note plus
accrued and unpaid interest. In the event that the Subordinated Notes are
repaid, the Preferred Securities and the Common Securities will be redeemed on a
pro rata basis at $25 per Preferred Security and Common Security plus
accumulated and unpaid distributions. The Company's obligations under the
Subordinated Notes, the Declaration of Trust (the agreement under which the
Trust was formed), the guarantee of payment of certain distributions, redemption
payments and liquidation payments with respect to the Preferred Securities to
the extent the Trust has funds available therefor and the indenture governing
the Subordinated Notes, including the Company's agreement pursuant to such
indenture to pay all fees and expenses of the Trust, other than with respect to
the Preferred Securities and Common Securities, taken together, constitute a
full and unconditional guarantee on a subordinated basis by the Company of
payments due on the Preferred Securities. As of December 31, 1996, 2.4 million
Preferred Securities were outstanding.
      The Company has the right to defer payments of interest on the
Subordinated Notes by extending the interest payment period at any time for up
to 20 consecutive quarters (each, an Extension Period). If interest payments are
so deferred, distributions will also be deferred. During such Extension Period,
distributions will continue to accrue with interest thereon (to the extent
permitted by applicable law) at an annual rate of 9.125% per annum compounded
quarterly. There could be multiple Extension Periods of varying lengths
throughout the term of the Subordinated Notes. If the Company exercises the
right to extend an interest payment period, the Company shall not during such
Extension Period (i) declare or pay dividends on, or make a distribution with
respect to, or redeem, purchase or acquire or make a liquidation payment with
respect to, any of its capital stock, or (ii) make any payment of interest,
principal or premium, if any, on or repay, repurchase, or redeem any debt
securities issued by the Company that rank pari passu with or junior to the
Subordinated Notes; provided, however, that restriction (i) above does not apply
to any stock dividends paid by the Company where the dividend stock is the same
as that on which the dividend is being paid. The Company has no present
intention of exercising its right to extend the interest payment period.
<PAGE>   24
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
NOTE 6 -- LONG-TERM DEBT
 
<TABLE>
<CAPTION>
               December 31,                          1996                       1995
                                            ----------------------     ----------------------
                                            CARRYING       MARKET      Carrying       Market
                                             AMOUNT        VALUE        Amount        Value
                                                         (Thousands of dollars)
<S>                                         <C>           <C>          <C>           <C>
Debentures:
  9% Series A, due 2011                     $      --     $     --     $  26,890     $ 27,663
  9% Series B, due 2011                            --           --        31,213       32,110
  8 3/4% Series C, due 2011                        --           --        18,353       18,881
  9 3/8% Series D, due 2017                        --           --       120,000      126,150
  10% Series E, due 2013                           --           --        23,069       23,963
  9 3/4% Series F, due 2002                   100,000      112,960       100,000      117,600
  7 1/2% Series, due 2006                      75,000       76,740            --           --
  8% Series, due 2026                          75,000       78,600            --           --
  Unamortized discount                         (3,137)          --        (6,209)          --
- ---------------------------------------------------------------------------------------------
                                              246,863                    313,316
- ---------------------------------------------------------------------------------------------
Term-loan facilities                          184,000      184,000       200,000      200,000
- ---------------------------------------------------------------------------------------------
Industrial development revenue bonds:
  Variable-rate bonds
     Series due 2028                           50,000       50,000        50,000       50,000
     Less funds held in trust                 (30,261)          --       (32,942)          --
- ---------------------------------------------------------------------------------------------
                                               19,739                     17,058
- ---------------------------------------------------------------------------------------------
  Fixed-rate bonds
     7.30% 1992 Series A, due 2027             30,000       32,029        30,000       31,560
     7.50% 1992 Series B, due 2032            100,000      107,232       100,000      106,500
     6.50% 1993 Series A, due 2033             75,000       75,241        75,000       75,000
     Unamortized discount                      (3,654)          --        (3,757)          --
     Less funds held in trust                      --           --        (3,672)          --
- ---------------------------------------------------------------------------------------------
                                              201,346                    197,571
- ---------------------------------------------------------------------------------------------
Other                                          19,948                         --
- ---------------------------------------------------------------------------------------------
                                              671,896                    727,945
Less current maturities                        (6,675)                  (120,000)
- ---------------------------------------------------------------------------------------------
                                            $ 665,221                  $ 607,945
=============================================================================================
</TABLE>
<PAGE>   25
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 
 
      In August 1996, the Company issued $75 million of 7 1/2 percent debentures
due 2006 and $75 million of 8 percent debentures due 2026. Net proceeds of $148
million as well as a portion of the $163 million net proceeds from the PriMerit
sale were used to refund or retire $219 million of outstanding callable
debentures and pay down short-term debt. The remaining amount was used for
general corporate purposes, including the acquisition of property for the
construction, completion, extension, and improvement of Southwest's pipeline
systems. The refinancing achieved a 126 basis point reduction in the related
average interest rate.
      In October 1996, the Company filed a $250 million shelf registration
statement. In connection with this new registration statement, the Company may
offer, up to the registered amount, any combination of debt securities,
preferred stock, depositary shares, and common stock. This registration
statement includes a carryforward of $60 million remaining from a prior shelf
registration statement declared effective by the Securities and Exchange
Commission in October 1995. The Company filed a prospectus supplement in
December 1996 identifying $150 million of the shelf as medium-term notes. In
January 1997, the Company issued $25 million of 7.59 percent notes due January
2017. In February 1997, the Company issued $25 million of 7.78 percent notes due
February 2022.
      The $200 million term-loan facility provides for a revolving period
through January 1999 at which time any amounts borrowed under the agreement
become payable on demand. A letter of credit is available to provide credit
support for the issuance of commercial paper. In addition, direct borrowing
options are available which provide for interest at either the London Interbank
Offering Rate (LIBOR) or certificate of deposit rate, plus a margin based on the
Company's credit rating, or the prime rate. The average cost of this facility
was 6.28 percent in 1996 and 6.86 percent in 1995. Amounts outstanding at both
year ends consisted of commercial paper.
      The interest rate on the variable-rate industrial development revenue
bonds (IDRB) is established on a weekly basis and averaged 4.16 percent in 1996,
4.80 percent in 1995, and 3.85 percent in 1994. At the option of the Company,
the interest period can be converted from a weekly rate to a daily-term or
variable-term rate.
      The fair value of the term-loan facilities approximates carrying value.
Market values for the debentures and fixed-rate IDRB were determined based on
dealer quotes using trading records for December 31, 1996 and 1995, as
applicable, and other secondary sources which are customarily consulted for data
of this kind. The carrying value of the IDRB Series due 2028 was used as the
estimate of fair value based upon the variable interest rate of the bonds.
      Estimated maturities of long-term debt for the next five years are
expected to be $6.7 million, $5.9 million, $188 million, $2.9 million, and
$185,000, respectively.
      In June 1996, the Financial Accounting Standards Board (FASB) issued SFAS
No. 125, "Accounting for Transfers and Servicing of Financial Assets and
Extinguishments of Liabilities." This
<PAGE>   26
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 
 
statement provides accounting and reporting standards for transfers and
servicing of financial assets and extinguishments of liabilities. This statement
became effective January 1, 1997. The Company does not anticipate any material
effect on its financial position or results of operations from this statement.
 
NOTE 7 -- SHORT-TERM DEBT
 
      The Company has an agreement with several banks for committed credit lines
which aggregate $150 million at December 31, 1996. The agreement provides for
the payment of interest at competitive market rates. The lines of credit also
require the payment of a commitment fee based on the long-term debt rating of
the Company. The committed credit lines have no compensating balance
requirements and expire in July 1997. Short-term borrowings were $121 million
and $37 million at December 31, 1996 and 1995, respectively. The weighted
average interest rates on these borrowings were 6.83 percent at December 31,
1996 and 6.64 percent at December 31, 1995.
 
NOTE 8 -- COMMITMENTS AND CONTINGENCIES
 
      Legal Proceedings. The Company has been named as defendant in various
legal proceedings. The ultimate dispositions of these proceedings are not
presently determinable; however, it is the opinion of management that no
litigation to which the Company is subject will have a material adverse impact
on its financial position or results of operations.
      Northern California Expansion. In 1995, Southwest initiated a multi-year,
three-phase construction project to expand its northern California service
territory and extend service into Truckee, California. The CPUC imposed a $29
million cost cap on the project as a condition of granting Southwest a
certificate of public convenience and necessity to serve the expansion areas.
      In 1995, Southwest completed Phase I of the expansion project, which
involved transmission system reinforcement and distribution system expansion to
accommodate 940 additional customers. Construction costs of $7.1 million were on
target with the cost estimate approved by the CPUC.
      Phase II of the project involved extending the transmission system to
Truckee, California and distribution system expansion to accommodate 4,200
customers. The cost cap apportioned to Phase II was approximately $13.8 million.
The incurred cost of Phase II through December 1996 was $26.9 million, with
approximately $1.2 million remaining to complete this phase in 1997. An
estimated $9.2 million of the cost overrun was due to changes in project scope,
such as adjustments for design changes required by governmental bodies, changes
in facilities beyond Southwest's control and costs incurred to accommodate
customer service requests.
      Examples of adjustments for changes in project scope are: Southwest was
required to haul excavated soil offsite to be screened whereas normal and
anticipated practice is to screen on site; asphalt repairs were greater than
expected as a result of increased paving requirements imposed after construction
started, poor road conditions, and the installation of more facilities under
asphalt
<PAGE>   27
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (Continued)
 
than anticipated. Other unanticipated or externally imposed costs pertained to
extended yard lines, underground boring, environmental studies, right-of-way
acquisitions, and engineering design work.
      Phase III of the construction project involving distribution system
expansion to add 4,200 customers has a cost cap apportionment of approximately
$8.2 million. Management is currently reexamining construction requirements, and
the scope of this phase in light of the cost overruns and difficult construction
environment experienced in Phase II of the project. As a result, no estimate of
the overall expansion cost or final construction timeline is currently
available.
      Management believes that because of the cost overruns which have occurred
in Phase II of the project, an impairment of its expansion assets up to the
amount of the cost overruns could occur in the future if the CPUC either
directly or indirectly denies recovery of the excess costs. An impairment has
not occurred because Southwest is currently on a form of performance-based
ratemaking (PBR) in California (see Rates and Regulatory Proceedings section of
Management's Discussion and Analysis) which effectively provides for recovery of
the northern California expansion assets and an acceptable return on investment.
It is management's intention to request a further extension of the PBR mechanism
in California during 1997. Management believes it is probable that Southwest
will receive the proposed extension, and will continue earning a return on the
northern California expansion assets.
 
NOTE 9 -- EMPLOYEE BENEFITS
 
      Southwest has a qualified retirement plan covering its employees. The plan
is noncontributory with defined benefits, and covers substantially all
employees. Southwest's policy is to fund the plan at not less than the minimum
required contribution nor more than the tax deductible limit. Plan assets are
held in a master trust whose investments consist of common stock, corporate
bonds, government obligations, real estate, a mutual fund investing in foreign
stocks, an insurance company contract, and cash or cash equivalents.
      The plan provides that an employee may earn benefits for a period of up to
30 years and will be vested after 5 years of service. Retirement plan costs were
$7.2 million in 1996, $6.8 million in 1995, and $7.8 million in 1994.
<PAGE>   28
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 
 
      The following table sets forth the plan's funded status and amounts
recognized on the Consolidated Balance Sheets and Statements of Income.
 
<TABLE>
<CAPTION>
                           December 31,                               1996          1995
- -------------------------------------------------------------------------------------------
                                                                    (Thousands of dollars)
<S>                                                                 <C>           <C>
Actuarial present value of benefit obligations:
Accumulated benefit obligation, including vested benefits of
  $(124,156) and $(111,035), respectively                           $(133,752)    $(119,340)
===========================================================================================
Projected benefit obligation for service rendered to date           $(187,183)    $(167,414)
Market value of plan assets                                           195,994       169,524
- -------------------------------------------------------------------------------------------
Assets in excess of projected benefit obligation                        8,811         2,110
Unrecognized net transition obligation being amortized through
  2004                                                                  5,816         6,652
Unrecognized net loss (gain)                                          (14,741)       (8,669)
Unrecognized prior service cost                                           409           466
- -------------------------------------------------------------------------------------------
Prepaid retirement plan asset included in the Consolidated Balance
  Sheets                                                            $     295     $     559
===========================================================================================
Assumptions used to develop pension obligations were:
  Discount rate                                                          7.00%         7.25%
  Long-term rate of return on assets                                     9.00%         9.00%
  Rate of increase in compensation levels                                4.75%         4.75%
</TABLE>
 
<TABLE>
<CAPTION>
                Year Ended December 31,                     1996         1995         1994
- --------------------------------------------------------------------------------------------
                                                                (Thousands of dollars)
<S>                                                       <C>          <C>          <C>
Net retirement plan costs include the following
  components:
  Service cost                                            $  8,762     $  7,153     $  7,805
  Interest cost                                             11,993       11,084       10,164
  Actual return on plan assets                             (23,511)     (35,557)         254
  Net amortization and deferrals                             9,976       24,136      (10,440)
- --------------------------------------------------------------------------------------------
Net periodic retirement plan cost                         $  7,220     $  6,816     $  7,783
============================================================================================
</TABLE>
 
      In addition to the basic retirement plan, Southwest has a separate
unfunded supplemental retirement plan which is limited to certain officers. The
plan is noncontributory with defined benefits. Senior officers who retire with
ten years or more of service with Southwest are eligible to receive benefits.
Other officers who retire with 20 years or more of service with Southwest are
eligible to receive benefits. Plan costs were $1.8 million in 1996, $2 million
in 1995, and $2 million in 1994. The accumulated benefit obligation of the plan
was $15.4 million, including vested
<PAGE>   29
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 
 
benefits of $14.2 million, at December 31, 1996. Southwest also has an unfunded
retirement plan for directors not covered by the employee retirement plan. The
cost and liability for this plan are not significant.
      The Employees' Investment Plan provides for purchases of the Company's
common stock or certain other investments by eligible Southwest employees
through deductions of up to 16 percent of base compensation, subject to IRS
limitations. Southwest matches one-half of amounts deferred up to six percent of
an employee's annual compensation. The cost of the plan was $2.6 million in
1996, $2.3 million in 1995, and $2.6 million in 1994. Northern has a separate
plan, the cost and liability for which are not significant.
      Southwest has a deferred compensation plan for all officers and members of
the Board. The plan provides the opportunity to defer from a minimum of $2,000
up to 50 percent of annual compensation. Southwest matches one-half of amounts
deferred up to six percent of an officer's annual salary. Payments of
compensation deferred, plus interest, commence upon the participant's retirement
in equal monthly installments over 10, 15, or 20 years, as determined by
Southwest. Deferred compensation earns interest at a rate determined each
January. The interest rate represents 150 percent of Moody's Seasoned Corporate
Bond Index.
      Southwest provides postretirement benefits other than pensions (PBOP) to
its qualified retirees for health care, dental, and life insurance. Southwest
accounts for PBOP on an accrual basis. The PSCN, CPUC, and FERC have approved
the use of accrual accounting for ratemaking purposes, subject to certain
conditions, including funding. Southwest did not receive approval to recover
PBOP costs on an accrual basis in its Arizona rate jurisdictions, but was
authorized to continue to recover the pay-as-you-go costs for ratemaking
purposes. Southwest began funding the non-Arizona portion of the PBOP liability
in 1994. Plan assets are combined with the pension plan assets in a master trust
for investment purposes.
<PAGE>   30
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 
 
      The following table sets forth the PBOP funded status and amounts
recognized on the Company's Consolidated Balance Sheets and Statements of
Income.
 
<TABLE>
<CAPTION>
                     December 31,                            1996               1995
- ------------------------------------------------------------------------------------------
                                                              (Thousands of dollars)
<S>                                                     <C>                <C>
Accumulated postretirement benefit obligation (APBO)
  Retirees                                                    $(14,291)           $(15,030)
  Fully eligible actives                                        (2,322)             (1,956)
  Other active participants                                     (7,275)             (6,182)
- ------------------------------------------------------------------------------------------
     Total                                                     (23,888)            (23,168)
Market value of plan assets                                      2,408               1,647
- ------------------------------------------------------------------------------------------
APBO in excess of plan assets                                  (21,480)            (21,521)
Unrecognized transition obligation                              13,871              14,738
Unrecognized prior service cost                                     --                  --
Unrecognized loss                                                2,543               3,003
- ------------------------------------------------------------------------------------------
Accrued postretirement benefit liability                      $ (5,066)           $ (3,780)
==========================================================================================
Assumptions used to develop postretirement benefit
  obligations were:
  Discount rate                                                   7.00%               7.25%
  Medical inflation                                     8% graded to 5%     9% graded to 5%
  Salary increases                                                4.75%               4.75%
</TABLE>
 
      The Company makes fixed contributions, based on age and years of service,
to retiree spending accounts for the medical and dental costs of employees who
retire after 1988. The Company pays up to 100 percent of the medical coverage
costs for employees who retired prior to 1989. The medical inflation assumptions
in the table above apply to the benefit obligations for pre-1989 retirees only.
The inflation assumption at December 31, 1996, was estimated at eight percent
for 1997, and decreases one-half of one percent per year until 2003, at which
time the average annual increase is projected to be five percent. A one percent
increase in these assumptions would change the accumulated postretirement
benefit obligation by approximately $1.2 million at December 31, 1996. Future
annual benefit costs would increase $130,000.
<PAGE>   31
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 
 
<TABLE>
<CAPTION>
                    Year Ended December 31,                       1996       1995       1994
- ---------------------------------------------------------------------------------------------
                                                                    (Thousands of dollars)
<S>                                                              <C>        <C>        <C>
Net periodic postretirement benefit costs include the following
  components:
  Service cost                                                   $  521     $  399     $  473
  Interest cost                                                   1,638      1,562      1,472
  Actual return on plan assets                                     (252)      (286)        --
  Net amortization and deferrals                                    997      1,061        911
- ---------------------------------------------------------------------------------------------
Net periodic postretirement benefit cost                         $2,904     $2,736     $2,856
=============================================================================================
</TABLE>
 
      In October 1995, the FASB issued SFAS No. 123, "Accounting for Stock-Based
Compensation." This new standard permits the continued use of accounting methods
prescribed by Accounting Principles Board (APB) Opinion No. 25, "Accounting for
Stock Issued to Employees," or use of the fair value based method of accounting
as encouraged by the statement. The following disclosure complies with the
requirements of the new standard.
      At December 31, 1996, the Company had two stock-based compensation plans.
These plans are accounted for in accordance with APB Opinion No. 25, "Accounting
for Stock Issued to Employees." In connection with the stock-based compensation
plans, the Company recognized compensation expense of $571,000 in 1996 and
$300,000 in 1995. Had compensation cost been determined based on the fair value
of the awards at the grant dates, net income and earnings per share would have
reflected the pro forma amounts indicated below (thousands of dollars, except
per share amounts):
 
<TABLE>
<CAPTION>
                                                                          1996        1995
- --------------------------------------------------------------------------------------------
<S>                                          <C>                         <C>        <C>
Net income (loss)                            As reported                 $6,574     $(14,882)
                                             Pro forma                   $6,523     $(14,871)
Primary earnings (loss) per share            As reported                 $ 0.25     $  (0.66)
                                             Pro forma                   $ 0.25     $  (0.66)
</TABLE>
 
      With respect to the first plan, the Company may grant options to purchase
shares of common stock to key employees and outside directors. Each option has
an exercise price equal to the market price of Company common stock on the date
of grant and a maximum term of 10 years. In July 1996, 350,000 options were
granted. The options vest 40 percent at the end of year one and 30 percent at
the end of years two and three. The grant date fair value of the options was
estimated
<PAGE>   32
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 
 
using the extended binomial option pricing model. The following assumptions were
used in the valuation calculation:
 
<TABLE>
<CAPTION>
                                                                         1996
- ------------------------------------------------------------------------------------------
<S>                                                          <C>
Dividend yield                                                                        4.65%
Risk-free interest rate                                          RANGING FROM 5.83 TO 6.42%
Expected volatility                                                  RANGING FROM 22 TO 25%
Expected life                                                                 1 TO 3 YEARS
</TABLE>
 
      As of the grant date, the weighted average fair value of the options
granted was $1.79. At December 31, 1996, the weighted average remaining
contractual life of the options was 9.5 years.
      In addition to the option plan, the Company may issue restricted stock in
the form of performance shares to encourage key employees to remain in its
employment to achieve short-term and long-term performance goals. Plan
participants are eligible to receive a cash bonus (i.e., short-term incentive)
and performances shares (i.e., long-term incentive). The performance shares vest
over a period of three years and are subject to a final adjustment as determined
by the Board of Directors. The following table summarizes the activity of this
plan:
 
<TABLE>
<CAPTION>
                  Year Ended December 31,                     1996         1995        1994
- ---------------------------------------------------------------------------------------------
<S>                                                          <C>          <C>         <C>
Nonvested performance shares at beginning of year             41,422      18,001           --
Performance shares granted                                    63,968      25,363       18,001
Performance shares forfeited                                      --          --           --
Shares vested and issued                                     (12,104)     (1,942)          --
- ---------------------------------------------------------------------------------------------
Nonvested performance shares at end of year                   93,286      41,422       18,001
=============================================================================================
Grant date fair value of award                               $ 17.75      $15.25      $17.625
=============================================================================================
</TABLE>
<PAGE>   33
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 
 
NOTE 10 -- INCOME TAXES
 
      Income tax expense (benefit) consists of the following (thousands of
dollars):
 
<TABLE>
<CAPTION>
                 Year Ended December 31,                     1996         1995        1994
- --------------------------------------------------------------------------------------------
<S>                                                        <C>          <C>          <C>
Current:
  Federal                                                  $(15,087)    $ 13,588     $16,481
  State                                                      (1,566)       1,985       2,701
- --------------------------------------------------------------------------------------------
                                                            (16,653)      15,573      19,182
- --------------------------------------------------------------------------------------------
Deferred:
  Federal                                                    18,832      (13,752)     (4,441)
  State                                                       1,695         (982)       (146)
- --------------------------------------------------------------------------------------------
                                                             20,527      (14,734)     (4,587)
- --------------------------------------------------------------------------------------------
     Total income tax expense                              $  3,874     $    839     $14,595
============================================================================================
</TABLE>
 
      Deferred income tax expense (benefit) consists of the following
significant components (thousands of dollars):
 
<TABLE>
<CAPTION>
                 Year Ended December 31,                     1996         1995        1994
- --------------------------------------------------------------------------------------------
<S>                                                         <C>         <C>          <C>
Deferred federal and state:
  Property-related items                                    $11,586     $  4,921     $ 2,441
  Purchased gas cost adjustments                              8,437      (16,488)     (5,531)
  Self insurance                                                (90)        (885)      1,161
  All other deferred                                          1,462       (1,414)     (1,782)
- --------------------------------------------------------------------------------------------
     Total deferred federal and state                        21,395      (13,866)     (3,711)
Deferred investment tax credit, net                            (868)        (868)       (876)
- --------------------------------------------------------------------------------------------
  Total deferred income tax expense (benefit)               $20,527     $(14,734)    $(4,587)
============================================================================================
</TABLE>
<PAGE>   34
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
      The consolidated effective income tax rate for the period ended December
31, 1996 and the two prior periods differs from the federal statutory income tax
rate. The sources of these differences and the effect of each are summarized as
follows:
 
<TABLE>
<CAPTION>
                       Year Ended December 31,                         1996     1995      1994
- ----------------------------------------------------------------------------------------------
<S>                                                                    <C>      <C>       <C>
Federal statutory income tax rate                                      35.0%     35.0%    35.0%
  Net state tax liability                                               5.0       9.0      4.3
  Property-related items                                                8.8      24.1      2.1
  Tax credits                                                          (8.3)    (22.7)    (2.3)
  Tax exempt interest                                                  (3.7)    (13.8)      --
  Corporate-owned life insurance                                       (4.0)    (12.5)    (1.4)
  All other differences                                                 4.3       4.9      0.6
- ----------------------------------------------------------------------------------------------
Consolidated effective income tax rate                                 37.1%     24.0%    38.3%
==============================================================================================
</TABLE>
 
      Deferred tax assets and liabilities consist of the following (thousands of
dollars):
 
<TABLE>
<CAPTION>
                            December 31,                                1996         1995
- -------------------------------------------------------------------------------------------
<S>                                                                   <C>          <C>
Deferred tax assets:
  Deferred income taxes for future amortization of ITC                $ 12,729     $ 13,256
  Employee benefits                                                      6,194        5,306
  Regulatory balancing accounts                                          3,832       12,411
  Other                                                                  4,415        3,017
  Valuation allowance                                                       --           --
- -------------------------------------------------------------------------------------------
                                                                        27,170       33,990
- -------------------------------------------------------------------------------------------
Deferred tax liabilities:
  Property-related items, including accelerated depreciation           114,176      101,133
  Property-related items previously flowed-through                      24,160       26,467
  Unamortized ITC                                                       19,006       19,874
  Debt-related costs                                                     6,757        4,462
  Other                                                                  7,125        3,858
- -------------------------------------------------------------------------------------------
                                                                       171,224      155,794
- -------------------------------------------------------------------------------------------
Net deferred tax liabilities                                          $144,054     $121,804
===========================================================================================
Current                                                               $ (8,009)    $(17,089)
Noncurrent                                                             152,063      138,893
- -------------------------------------------------------------------------------------------
Net deferred tax liabilities                                          $144,054     $121,804
===========================================================================================
</TABLE>
 
NOTE 11 -- ACQUISITION OF NORTHERN PIPELINE CONSTRUCTION CO.
 
      On April 29, 1996, the Company acquired all of the outstanding stock of
Northern Pipeline Construction Co. (the construction services segment) pursuant
to a definitive agreement dated November 1995. The Company issued approximately
1,439,000 shares of common stock valued at $24 million in connection with the
acquisition. The acquisition was accounted for as a purchase.
<PAGE>   35
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
Goodwill in the amount of approximately $10 million was recorded by the
construction services segment and is being amortized over a period of
approximately 25 years. The construction services segment provides utility
companies with trenching and installation, replacement, and maintenance services
for energy distribution systems.
 
      During the period from the acquisition date through December 31, 1996, the
construction services segment recognized $36 million of revenues generated from
contracts with Southwest. These revenues and associated profits are included in
the consolidated financial statements of the Company and were not eliminated
during consolidation. SFAS No. 71, "Accounting for the Effects of Certain Types
of Regulation," provides that intercompany profits on sales to regulated
affiliates should not be eliminated in consolidation if the sales price is
reasonable and if future revenues approximately equal to the sales price will
result from the rate-making process. Management believes these two criteria will
be met. As of year end, accounts receivable includes $6.4 million which was not
eliminated during consolidation.
 
      The assets acquired and the liabilities assumed at the acquisition date
were as follows (thousands of dollars):
 
<TABLE>
<S>                                                                                 <C>
Other property and investments                                                      $26,490
Receivables, net                                                                     12,928
Prepaids and other current assets                                                     2,545
Deferred charges and other assets                                                    11,340
- -------------------------------------------------------------------------------------------
  Total assets acquired                                                              53,303
- -------------------------------------------------------------------------------------------
Long-term debt and capital leases, including current maturities                      14,691
Short-term debt                                                                       2,942
Accounts payable                                                                      3,123
Other current liabilities                                                             6,759
Deferred income taxes                                                                 4,737
Other deferred credits                                                                  394
- -------------------------------------------------------------------------------------------
  Total liabilities assumed                                                          32,646
- -------------------------------------------------------------------------------------------
Net noncash assets acquired                                                          20,657
Cash acquired in acquisition and included in cash flow statement                      3,343
- -------------------------------------------------------------------------------------------
Total common equity issued in acquisition                                           $24,000
===========================================================================================
</TABLE>
<PAGE>   36
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
NOTE 12 -- SEGMENT INFORMATION
 
      The financial information pertaining to the Company's natural gas
operations and construction services segments for each of the three years in the
period ended December 31, 1996, is as follows (thousands of dollars):
 
<TABLE>
<CAPTION>
                                                                       1996
                                                    ------------------------------------------
                                                       GAS         CONSTRUCTION
                                                    OPERATIONS       SERVICES         TOTAL
- ----------------------------------------------------------------------------------------------
<S>                                                 <C>            <C>              <C>
Revenues from unaffiliated customers                $  546,361      $   61,646      $  608,007
Intersegment sales                                          --          36,054          36,054
- ----------------------------------------------------------------------------------------------
  Total                                             $  546,361      $   97,700      $  644,061
==============================================================================================
Operating income                                    $   64,818      $    6,755      $   71,573
==============================================================================================
Depreciation, depletion and amortization            $   67,443      $    6,256      $   73,699
==============================================================================================
Construction expenditures and property additions    $  210,743      $    8,092      $  218,835
==============================================================================================
Indentifiable assets                                $1,498,099      $   62,170      $1,560,269
==============================================================================================
</TABLE>
 
<TABLE>
<CAPTION>
                                                                        1995
                                                     ------------------------------------------
                                                        Gas         Construction
                                                     Operations       Services         Total
- -----------------------------------------------------------------------------------------------
<S>                                                  <C>            <C>              <C>
Operating revenues                                   $  563,502       $     --       $  563,502
===============================================================================================
Operating income                                     $   58,412       $     --       $   58,412
===============================================================================================
Depreciation, depletion and amortization             $   62,492       $     --       $   62,492
===============================================================================================
Construction expenditures and property additions     $  166,183       $     --       $  166,183
===============================================================================================
Indentifiable assets                                 $1,357,034       $     --       $1,357,034
===============================================================================================
</TABLE>
 
<TABLE>
<CAPTION>
                                                                        1994
                                                     ------------------------------------------
                                                        Gas         Construction
                                                     Operations       Services         Total
- -----------------------------------------------------------------------------------------------
<S>                                                  <C>            <C>              <C>
Operating revenues                                   $  599,553       $     --       $  599,553
===============================================================================================
Operating income                                     $   88,690       $     --       $   88,690
===============================================================================================
Depreciation, depletion and amortization             $   57,284       $     --       $   57,284
===============================================================================================
Construction expenditures and property additions     $  141,390       $     --       $  141,390
===============================================================================================
Indentifiable assets                                 $1,277,727       $     --       $1,277,727
===============================================================================================
</TABLE>

<PAGE>   37
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 
 
NOTE 13 -- QUARTERLY FINANCIAL DATA (UNAUDITED)
 
<TABLE>
<CAPTION>
             Quarter Ended               March 31     June 30   September 30  December 31
- -----------------------------------------------------------------------------------------
                                         (Thousands of dollars, except per share amounts)
<S>                                      <C>          <C>       <C>           <C>
1996
Operating revenues                       $188,352     $123,611      $125,255     $206,843
Operating income (loss)                    38,539       (4,747)       (8,404)      46,185
Net income (loss)                          14,859      (11,943)      (14,638)      18,296
Net income (loss) applicable to common
  stock                                    14,859      (11,943)      (14,638)      18,296
Earnings (loss) per common share*            0.60        (0.46)        (0.55)        0.69
 
1995
Operating revenues                       $203,521     $122,189      $ 91,433     $146,359
Operating income (loss)                    36,829       (2,873)       (9,215)      33,671
Income (loss) from continuing
  operations                               14,449       (9,951)      (13,353)      11,509
Income (loss) from discontinued
  operations                                  196          610           522      (18,864)
Net income (loss)                          14,645       (9,341)      (12,831)      (7,355)
Net income (loss) applicable to common
  stock                                    14,550       (9,436)      (12,926)      (7,377)
Earnings (loss) per share from
  continuing operations*                     0.67        (0.44)        (0.56)        0.47
Earnings (loss) per share from
  discontinued operations*                   0.01         0.03          0.02        (0.77)
Earnings (loss) per common share*            0.68        (0.41)        (0.54)       (0.30)
 
1994
Operating revenues                       $207,369     $108,407      $ 92,245     $191,532
Operating income (loss)                    47,519       (4,251)       (8,302)      53,725
Income (loss) from continuing
  operations                               21,734      (10,735)      (11,911)      24,436
Income (loss) from discontinued
  operations                                  976          954           746          101
Net income (loss)                          22,710       (9,781)      (11,165)      24,537
Net income (loss) applicable to common
  stock                                    22,571       (9,919)      (11,303)      24,442
Earnings (loss) per share from
  continuing operations*                     1.03        (0.52)        (0.57)        1.15
Earnings (loss) per share from
  discontinued operations*                   0.04         0.05          0.03           --
Earnings (loss) per common share*            1.07        (0.47)        (0.54)        1.15
</TABLE>
 
- ------------------------------
* The sum of quarterly earnings (loss) per average common share may not equal
  the annual earnings (loss) per share due to the ongoing change in the weighted
  average number of common shares outstanding.
<PAGE>   38
 
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS 
 
      The demand for natural gas is seasonal, and it is management's opinion
that comparisons of earnings for the interim periods do not reliably reflect
overall trends and changes in the Company's operations. Also, the timing of
general rate relief can have a significant impact on earnings for interim
periods. See Management's Discussion and Analysis for additional discussion of
the Company's operating results.
 
NOTE 14 -- DISCONTINUED OPERATIONS -- FINANCIAL SERVICES ACTIVITIES
 
      On July 19, 1996, the Company completed the sale of the assets and
liabilities of PriMerit Bank (the Bank) to Norwest Corporation for $191 million.
Proceeds from the sale were used by the Company to retire debt incurred in
connection with its investment in the Bank. The loss on the sale, recorded
during the fourth quarter of 1995, was $13 million, including taxes. Income tax
expense resulted from the loss due to the Company's investment in the Bank being
lower for tax purposes than book purposes. The results of operations of the Bank
have been included as discontinued operations in the accompanying financial
statements.
<PAGE>   39
 
REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To the Shareholders,
  Southwest Gas Corporation:
 
      We have audited the accompanying consolidated balance sheets of Southwest
Gas Corporation (a California corporation, hereinafter referred to as the
Company) and subsidiaries as of December 31, 1996 and 1995, and the related
consolidated statements of income, stockholders' equity and cash flows for each
of the three years in the period ended December 31, 1996. These financial
statements are the responsibility of the Company's management. Our
responsibility is to express an opinion on these financial statements based on
our audits.
 
      We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
      In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of the Company and its
subsidiaries as of December 31, 1996 and 1995, and the results of their
operations and their cash flows for each of the three years in the period ended
December 31, 1996 in conformity with generally accepted accounting principles.
 
                                          ARTHUR ANDERSEN LLP
 
Las Vegas, Nevada
February 7, 1997

<PAGE>   1
 
                                                                   EXHIBIT 21.01
 
                           SOUTHWEST GAS CORPORATION
                     LIST OF SUBSIDIARIES OF THE REGISTRANT
                              AT DECEMBER 31, 1996
 
<TABLE>
<CAPTION>
                                             STATE OF INCORPORATION
            SUBSIDIARY NAME                   OR ORGANIZATION TYPE
            ---------------                  ----------------------   
<S>                                       <C>
LNG Energy, Inc.                                     Nevada
Paiute Pipeline Company                              Nevada
Northern Pipeline Construction Co.                   Nevada
Southwest Gas Transmission Company            Partnership between
                                           Southwest Gas Corporation
                                          and Utility Financial Corp.
Southwest Gas Capital I                             Delaware
Utility Financial Corp.                              Nevada
</TABLE>

<PAGE>   1
 
                                                                   EXHIBIT 23.01
 
                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
     As independent public accountants, we hereby consent to the incorporation
of our report dated February 7, 1997, incorporated by reference in this Form
10-K, into Southwest Gas Corporation's previously filed registration statements
on Form S-8 (File No. 33-58135), Form S-3 (File No. 33-58137), Form S-3 (File
No. 333-14605), and Form S-3 (File No. 333-17667).
 
                                          ARTHUR ANDERSEN LLP
 
Las Vegas, Nevada
March 25, 1997

<TABLE> <S> <C>

<ARTICLE> UT
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM SOUTHWEST
GAS CORPORATION'S FORM 10-K FOR THE YEAR ENDED DECEMBER 31, 1996 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<BOOK-VALUE>                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                    1,278,457
<OTHER-PROPERTY-AND-INVEST>                     71,245
<TOTAL-CURRENT-ASSETS>                         159,818
<TOTAL-DEFERRED-CHARGES>                             0
<OTHER-ASSETS>                                  50,749
<TOTAL-ASSETS>                               1,560,269
<COMMON>                                        28,363
<CAPITAL-SURPLUS-PAID-IN>                      349,132
<RETAINED-EARNINGS>                              2,121
<TOTAL-COMMON-STOCKHOLDERS-EQ>                 379,616
                                0
                                          0
<LONG-TERM-DEBT-NET>                           665,221
<SHORT-TERM-NOTES>                             121,000
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                       0
<LONG-TERM-DEBT-CURRENT-PORT>                    6,675
                            0
<CAPITAL-LEASE-OBLIGATIONS>                          0
<LEASES-CURRENT>                                     0
<OTHER-ITEMS-CAPITAL-AND-LIAB>                 387,757<F1>
<TOT-CAPITALIZATION-AND-LIAB>                1,560,269
<GROSS-OPERATING-REVENUE>                      644,061
<INCOME-TAX-EXPENSE>                             3,874
<OTHER-OPERATING-EXPENSES>                     572,488
<TOTAL-OPERATING-EXPENSES>                     572,488
<OPERATING-INCOME-LOSS>                         71,573
<OTHER-INCOME-NET>                             (6,212)<F2>
<INCOME-BEFORE-INTEREST-EXPEN>                  65,361
<TOTAL-INTEREST-EXPENSE>                        54,913
<NET-INCOME>                                     6,574
                          0
<EARNINGS-AVAILABLE-FOR-COMM>                    6,574
<COMMON-STOCK-DIVIDENDS>                        21,311
<TOTAL-INTEREST-ON-BONDS>                            0
<CASH-FLOW-OPERATIONS>                          52,195
<EPS-PRIMARY>                                     0.25
<EPS-DILUTED>                                     0.25
<FN>
<F1>Includes: trust originated preferred securities of $60,000, current
liabilities, net of current long-term debt maturities, of $133,663 and deferred
income taxes and other credits of $194,095.
<F2>Includes distributions related to trust originated preferred securities of
$5,475 and other expense of $737.
</FN>
        

</TABLE>


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