ATMOS ENERGY CORP
10-K, 1997-12-22
NATURAL GAS DISTRIBUTION
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<PAGE>
 
                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM 10-K
(Mark One)
[X]  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE
     SECURITIES EXCHANGE ACT OF 1934 (Fee Required)

For the fiscal year ended September 30, 1997  OR

[ ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
     SECURITIES EXCHANGE ACT OF 1934 (No Fee Required)

For the transition period from __________ to ____________

Commission File Number   1-10042

                            ATMOS ENERGY CORPORATION
             (Exact name of registrant as specified in its charter)

           TEXAS AND VIRGINIA                        75-1743247
     (State or other jurisdiction of               (IRS Employer
     incorporation or organization)             Identification No.)

     Three Lincoln Centre, Suite 1800
     5430 LBJ Freeway, Dallas, Texas                   75240
 (Address of principal executive offices             (Zip code)

     Registrant's telephone number, including area code: (972) 934-9227

     Securities registered pursuant to Section 12(b) of the Act:

                                         Name of each exchange
     Title of each class                  on which registered
     -------------------                 ---------------------
     Common stock, No Par Value          New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act:

                                      None

          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]
<PAGE>
 
          The aggregate market value of the voting stock held by non-affiliates
of the registrant was $738,585,541 as of November 25, 1997.  On November 25,
1997 the registrant had 29,770,088 shares of common stock outstanding.

                      DOCUMENTS INCORPORATED BY REFERENCE

          Portions of the registrant's definitive proxy statement filed for the
annual meeting of shareholders on February 11, 1998 are incorporated by
reference into Part III.
<PAGE>
 
Cautionary Statement under the Private Securities Litigation Reform Act of 1995

          The matters discussed or incorporated by reference in this Annual
Report on Form 10-K contain "forward-looking statements" within the meaning of
Section 27A of the Securities Act of 1933 or Section 21E of the Securities
Exchange Act of 1934.  All statements other than statements of historical facts
included in this Report including, but not limited to, those contained in the
following sections, Item 7, "Management's Discussion and Analysis of Financial
Condition and Results of Operations", and Notes 2, 5, and 11 of notes to
consolidated financial statements, regarding the Company's financial position,
business strategy and plans and objectives of management of the Company for
future operations, are forward-looking statements made in good faith by the
Company. Although the Company believes that the expectations reflected in such
forward-looking statements are reasonable, it can give no assurance that such
expectations will prove to have been correct.  Such forward-looking statements
are subject to risks and uncertainties that could cause actual results to differ
materially from those expressed or implied in the statements relating to the
Company's operations, markets, services, rates, recovery of costs, availability
of gas supply, and other factors. These risks and uncertainties include, but are
not limited to, economic, competitive, governmental, weather, technological and
other factors.


                                     PART I

ITEM 1.  BUSINESS

          Atmos Energy Corporation (the "Company") was organized under the laws
of the State of Texas in 1983 as a subsidiary of Pioneer Corporation ("Pioneer")
for the purposes of owning and operating Pioneer's natural gas distribution
business in Texas.  Immediate  ly following the transfer of such business, which
had been opera  ted by Pioneer and its predecessors since 1906, Pioneer distrib
uted the outstanding stock of the Company, then known as Energas Company, to
Pioneer shareholders.  In September 1988, the Company changed its name from
Energas Company to Atmos Energy Corporation.  As a result of its merger with
United Cities Gas Company in July 1997, the Company became incorporated in the
Commonwealth of Virginia as well as the State of Texas.

          The Company distributes and sells natural gas and propane to
approximately 1.02 million residential, commercial, industrial, agricultural,
and other customers.  The Company distributes and sells natural gas to
approximately 985,000 customers in 802 cities, towns, and communities in service
areas located in Texas, Louisiana, Kentucky, Colorado, Kansas, Illinois,
Tennessee, Iowa, Virginia, Georgia, South Carolina and Missouri.  The Company
also transports gas for others through parts of its distribution system.  It
also distributes propane to approximately 29,000 customers in Kentucky, North
Carolina, Tennessee and Virginia.
<PAGE>
 
          The Company's Texas distribution system is operated through its
Energas Company division (the "Energas Division") and covers an area having a
population of approximately 950,000 people.  The economy of the area is based
primarily on oil and gas production and agriculture.  The principal cities
served by the Energas Division include Amarillo, Lubbock, Midland, and Odessa.
At September 30, 1997, the Company served 311,571 customers in Texas.

          The Company's Louisiana distribution system is operated through its
Trans Louisiana Gas Company division (the "Trans La Division") and covers an
area having a population of approximately 250,000 people.  The economy of the
area is based primarily on oil and gas production, agriculture, and food
processing.  The principal cities served by the Trans La Division are Lafayette,
Pineville, and Natchitoches.  At September 30, 1997, the Company served 80,053
customers in Louisiana.

          The Company's Kentucky distribution system is operated through its
Western Kentucky Gas Company division (the "Western Kentucky Division") and
covers an area having a population of approximately 680,000 people.  The economy
of the area is based primarily on industry and agriculture.  The principal
cities served by the Western Kentucky Division include Bowling Green, Owensboro,
and Paducah.  At September 30, 1997, the Company served 173,958 customers in
Kentucky.

          The Company's distribution systems in Colorado and parts of Kansas and
Missouri are operated through its Greeley Gas Company division (the "Greeley Gas
Division") and covers an area having a combined population of approximately
228,000 people.  The economies of the areas served are based on oil and gas
production, agriculture and resort business.  The principal cities served by the
Greeley Gas Division include Greeley, Durango and Lamar, Colorado and Bonner
Springs, Herington and Ulysses, Kansas.  At September 30, 1997 the Greeley Gas
Division served 113,185 customers.

          The Company operates natural gas distribution systems in Georgia,
Illinois, Iowa, South Carolina, Tennessee, Virginia, Kansas and Missouri through
its United Cities Gas Company division (the "United Cities Division") and covers
an area having a combined population of approximately 6,695,000 people.  The
economies of the areas served include customers engaged in the manufacture of
asphalt, automobiles, auto parts, chemicals, electronics, food products, metals,
textiles and wire, among others.  The division also serves several colleges and
a major army base.  The principal cities and counties served by the United
Cities Division include Franklin and Murfreesboro, Tennessee; Wyandotte and
Johnson Counties in Kansas; Hannibal, Missouri; and Gainesville and Columbus,
Georgia. At September 30, 1997, the United Cities Division served 306,681
natural gas customers.

                                       2
<PAGE>
 
          The Company also operates certain non-utility businesses through
various wholly-owned subsidiaries.  One subsidiary, United Cities Gas Storage
Company ("UCG Storage"), provides natural gas storage services.  It owns natural
gas storage fields in Kentucky and Kansas to supplement natural gas used by
customers in those states.

          Another subsidiary, UCG Energy Corporation ("UCG Energy"), leases
appliances, real estate and equipment, and vehicles to the United Cities
Division and others, and owns a small interest in a partnership engaged in
exploration and production activities. UCG Energy also owns a 45% interest in
Woodward Marketing, L.L.C. ("WMLLC"), a gas marketing business incorporated in
Texas.  WMLLC provides gas marketing services to industrial customers,
municipalities and local distribution companies, including the United Cities
Division.  UCG Energy utilized equity accounting, effective January 1, 1995, for
this acquisition.  The excess of the purchase price over the value of the net
tangible assets, amounting to approximately $5,400,000, was allocated to
intangible assets consisting of customer contracts and goodwill, which are being
amortized over ten and twenty years, respectively.  In accordance with the
purchase agreement, if certain earnings targets are met, an additional payment
of up to $1,000,000 may be paid over a five-year period.

          UCG Energy also owns United Cities Propane Gas of Tennessee, Inc. (the
"Propane Division"), which is engaged in the retail distribution of propane (LP)
gas, the wholesale supply and transportation of LP gas, the transportation of
certain products for other companies and the direct merchandising and repair of
propane gas appliances.  Each of approximately 15 town operations has its own
storage facility with a total company storage capacity of 2,119,000 gallons.  As
of September 30, 1997, the Propane Division served 29,097 customers in
Tennessee, Kentucky, North Carolina and Virginia.  During the three-year period
ended September 30, 1997, the Propane Division added approximately 8,000
customers through acquisitions of four propane distribution companies and a
propane transport company.

          The natural gas and propane distribution industries are subject to a
number of factors, many of which affect the Company from time to time.  These
include (i) the ongoing need to obtain adequate and timely rate relief from
regulatory authorities to recover costs of service and earn a fair return on
invested capital; (ii) inherent seasonality of the business; (iii) competition
with alternate fuels; (iv) competition with other gas sources for industrial
customers, including the ability of some customers to bypass the Company's
facilities, which could result in loss of revenues and reduction in the
Company's net income; and (v) possible volatility in the supply and price of
natural gas and propane.

                                       3
<PAGE>
 
ACQUISITIONS AND MERGERS

          Since its organization in 1983, the Company has sought to expand its
customer base and to diversify the weather patterns, local economic conditions,
and regulatory environments to which its operations are subject.  As part of
this strategy, the Company acquired Trans Louisiana Gas Company, Inc. ("TLG") in
January 1986, Western Kentucky Gas Utility Corporation in December 1987, Greeley
Gas Company ("GGC") in December 1993, Oceana Heights Gas Company of Thibodaux,
Louisiana in November 1995 and United Cities Gas Company ("UCGC") in July 1997.
The Company continues to consider and pursue, where appropriate, additional
acquisitions of natural gas distribution properties and other business
opportunities.  For further information regarding the UCGC merger, see Note 2 of
notes to consolidated financial statements.



UTILITY AND NON-UTILITY DATA

          The following table summarizes certain information regarding the
operation of the utility and non-utility businesses of the Company for each of
the three years in the period ended September 30, 1997.  Prior periods have been
restated to reflect the pooling of interests with UCGC on July 31, 1997.

<TABLE>
<CAPTION>
 
                         Utility    Non-utility    Total
                        ----------  -----------  ----------
<S>                     <C>         <C>          <C>
                                 (In thousands)
1997
 Operating revenues     $  864,720      $42,115  $  906,835
 Net income                 20,463        3,375      23,838
 Identifiable assets     1,015,818       72,493   1,088,311
 
1996
 Operating revenues     $  837,125      $49,566  $  886,691
 Net income                 36,740        4,411      41,151
 Identifiable assets       926,935       83,675   1,010,610
 
1995
 Operating revenues     $  707,680      $41,875  $  749,555
 Net income                 24,618        4,190      28,808
 Identifiable assets       829,849       71,099     900,948
</TABLE>

          The utility business is comprised of the Company's five utility
divisions:  Energas Division, Greeley Gas Division, Trans La Division, United
Cities Division and Western Kentucky Division.  It includes regulated as well as
certain nonregulated utility businesses such as irrigation, transportation and
gas marketing activities in the utility divisions' respective service areas.

                                       4
<PAGE>
 
          The non-utility business includes the operations of UCG Storage and
UCG Energy, which includes a 45% interest in WMLLC (a gas marketer), the propane
business and leasing of real estate, vehicles and appliances.

OPERATING STATISTICS

          The table on the following page reflects the pooled operating
statistics of Atmos and the United Cities Division for fiscal 1997 and the
restated operating statistics for the previous four years on a pooled basis.  It
is followed by two tables of utility sales and operating statistics by business
unit for 1997 and 1996, respectively.  These two tables are followed by tables
of non-utility net income and propane statistics for 1997, 1996 and 1995.

                                       5
<PAGE>
 
                            ATMOS ENERGY CORPORATION
                         FIVE-YEAR OPERATING STATISTICS
<TABLE>
<CAPTION>
                                                           Year ended September 30,
                                               1997      1996          1995        1994       1993
                                              ------    ------        ------      ------     ------
<S>                                          <C>        <C>         <C>         <C>        <C>    
NUMBER OF CUSTOMERS, at
 end of year
   Residential                                 870,747    860,229    834,376    825,310      789,360
   Commercial                                   92,703     91,960     90,093     93,250       86,124
   Industrial (including agricultural)          17,217     19,403     19,762     20,219        9,564
   Public authority and other                    4,781      4,716      4,982      4,949        3,267
                                            ----------   --------   --------   --------   ----------
        Total natural gas customers            985,448    976,308    949,213    943,728      888,315
      Propane                                   29,097     26,108     23,359     21,693       20,498
                                            ----------  ---------   --------   --------   ----------
        Total Customers                      1,014,545  1,002,416    972,572    965,421      908,813
                                            ==========  =========   ========   ========   ==========
HEATING DEGREE DAYS, (2)
   Actual                                        3,909      4,043      3,706      3,855        4,080
   Percent of normal                                98%       101%        93%        97%         102%
 
SALES VOLUMES - MMcf (3)
   Residential                                  75,214     77,001     69,666     72,561       74,818   
   Commercial                                   37,382     38,247     34,921     35,250       36,307  
   Industrial (including agricultural)          46,417     57,863     57,290     57,638       50,537  
   Public authority and other                    5,195      5,182      4,779      5,242        4,403
                                            ----------  ---------   --------   --------   ----------
        Total                                  164,208    178,293    166,656    170,691      166,065
TRANSPORTATION VOLUMES -  MMcf (3)              48,800     44,146     47,647     47,882       51,665
                                            ----------  ---------   --------   --------   ----------
TOTAL VOLUMES DELIVERED - MMcf (3)             213,008    222,439    214,303    218,573      217,730
                                            ==========  =========   ========   ========   ==========
PROPANE - Gallons (000's)                       32,975     40,723     28,854     23,175       20,180
                                            ==========  =========   ========   ========   ==========
OPERATING REVENUES (000's)
Gas Revenues
   Residential                              $  452,864  $ 409,039   $337,768   $375,450   $  372,770   
   Commercial                                  193,302    186,032    150,949    165,883      165,611  
   Industrial (including agricultural)         168,386    187,693    171,591    188,791      160,410  
   Public authority and other                   23,898     21,738     18,185     22,463       18,315
                                            ----------  ---------   --------   --------   ----------
        Total gas revenues                     838,450    804,502    678,493    752,587      717,106
Transportation Revenues                         19,885     18,872     19,813     21,325       21,937
Other Revenue                                    6,385     13,751      9,374      6,879        8,014
                                            ----------  ---------   --------   --------   ----------
   Total utility revenues                      864,720    837,125    707,680    780,791      747,057
Non-utility revenues
   Propane revenues                             33,194     34,730     22,124     18,510       16,506
   Other revenues                                8,921     14,836     19,751     27,001       31,330
                                            ----------  ---------   --------   --------   ----------
   Total non-utility revenues                   42,115     49,566     41,875     45,511       47,836
                                            ----------  ---------   --------   --------   ----------
Total operating revenues                    $  906,835  $ 886,691   $749,555   $826,302   $  794,893
                                            ==========  =========   ========   ========   ==========
AVERAGE SALES PRICE/Mcf
   Residential                              $     6.02  $    5.31   $   4.85   $   5.17   $     4.98
   Commercial                                     5.17       4.86       4.32       4.71         4.56
   Industrial (including agricultural)            3.63       3.24       3.00       3.28         3.17
   Public authority and other                     4.60       4.19       3.81       4.29         4.16   
        Total                                     5.11       4.51       4.07       4.41         4.32
AVERAGE COST OF GAS/Mcf  SOLD                     3.51       3.15       2.70       3.10         3.04
AVERAGE TRANSPORTATION REVENUES/Mcf                .41        .43        .42        .45          .42
</TABLE>

See footnotes on page 7.

                                       6
<PAGE>
 
         UTILITY SALES AND STATISTICAL DATA BY BUSINESS UNIT - 1997(1)

<TABLE>
<CAPTION>
                                                                          Year ended September 30, 1997
                                                     --------------------------------------------------------------------
                                                                               Western    Greeley    United      Total
                                                       Energas       Trans La  Kentucky     Gas      Cities     Utility
                                                      ---------     ---------  --------   --------   -------    ---------
<S>                                                   <C>           <C>        <C>         <C>       <C>        <C>
UTILITY CUSTOMERS, at end of year
  Residential                                           268,518       73,546    154,219     99,472    274,992      870,747
  Commercial                                             25,234        5,409     17,706     13,328     31,026       92,703
  Industrial (including agricultural)                    15,589          120        460        385        663       17,217
  Public authority and other                              2,230          978      1,573          -          -        4,781
                                                       --------     --------   --------   --------   --------   ----------
  Total                                                 311,571       80,053    173,958    113,185    306,681      985,448
                                                       ========     ========   ========   ========   ========   ==========
HEATING DEGREE DAYS, (2)                                          
  Actual                                                  3,553        1,523      4,178      6,195      3,980        3,909
  Normal                                                  3,531        1,771      4,333      6,274      4,070        3,990
  Percent of normal                                         100%          86%        96%        99%        98%          98%
                                                                  
SALES VOLUMES - MMcf (3)                                          
  Residential                                            24,292        3,558     13,543     10,227     23,595       75,215
  Commercial                                              7,912        1,383      6,070      6,731     15,286       37,382
  Industrial (including agricultural)                    19,084        1,872      6,128      1,907     17,425       46,416
  Public authority and other                              2,689          951      1,555          -          -        5,195
                                                       --------     --------   --------   --------   --------   ----------
  Total                                                  53,977        7,764     27,296     18,865     56,306      164,208
                                                                  
TRANSPORTATION VOLUMES - MMcf (3)                         4,479          624     22,398      3,275     18,024       48,800
                                                       --------     --------   --------   --------   --------   ----------
                                                                  
TOTAL VOLUMES HANDLED - MMcf (3)                         58,456        8,388     49,694     22,140     74,330      213,008
                                                       ========     ========   ========   ========   ========   ==========
                                                                  
OTHER STATISTICS                                                  
  Operating revenues (000's)                           $234,310     $ 51,866   $144,139   $ 91,341   $343,064   $  864,720
  Gross plant (000's)                                  $322,774     $108,822   $175,793   $137,489   $501,972   $1,246,850
  Net plant (000's)                                    $208,289     $ 78,354   $105,393   $ 83,371   $314,591   $  789,998
  Miles of pipe                                          13,214        2,241      3,638      3,864      7,945       30,902
  Employees (4)                                             534          154        330        250      1,031        2,299
  Communities served                                         92           41        163        123        383          802
</TABLE>

(1) Atmos' utility business is comprised of the five utility divisions listed in
the table above.  Their operations include the regulated local distribution
companies and certain unregulated gas marketing subsidiaries located in their
respective service areas.  The Energas plant balances include certain shared
services utilty amounts.

(2) A heating degree day is equivalent to each degree that the average of the
high and the low temperatures for a day is below 65 degrees.  The greater the
number of heating degree days, the colder the climate. Heating degree days are
used in the natural gas industry to measure the relative coldness of weather
experienced and to compare relative temperatures between one geographic area and
another.  Normal degree days is based on 30-year average National Weather
Service data for selected locations.

(3) Volumes are reported as metered in million cubic feet ("MMcf").

(4) This excludes 218 and 235 Atmos shared services employees and 162 and 143
non-utility employees in United Cities in 1997 and 1996, respectively.

                                       7
<PAGE>
 
         UTILITY SALES AND STATISTICAL DATA BY BUSINESS UNIT - 1996 (1)

<TABLE>
<CAPTION>
                                                                          Year ended September 30, 1996
                                                     --------------------------------------------------------------------
                                                                               Western    Greeley    United      Total
                                                        Energas     Trans La   Kentucky     Gas      Cities     Utility
                                                       ---------   ---------   --------   --------   -------    ---------
<S>                                                   <C>           <C>        <C>         <C>       <C>        <C> 
UTILITY CUSTOMERS, at end of year
  Residential                                            266,805     73,414    151,798     97,653    270,559      860,229
  Commercial                                              24,950      5,392     17,334     13,230     31,054       91,960
  Industrial (including agricultural)                     17,780        118        467        401        637       19,403
  Public authority and other                               2,219        956      1,541          -          -        4,716
                                                        --------   --------   --------   --------   --------   ----------
 Total                                                   311,754     79,880    171,140    111,284    302,250      976,308
                                                        ========   ========   ========   ========   ========   ==========
                                                   
HEATING DEGREE DAYS, system average (2)            
  Actual                                                   3,331      1,980      4,610      5,912      4,322        4,043
  Normal                                                   3,528      1,760      4,376      6,234      4,070        3,990
  Percent of normal                                           94%       113%       105%        95%       106%         101%
                                                   
SALES VOLUMES (2)                                  
  Residential                                             22,842      4,205     14,694      9,829     25,458       77,028
  Commercial                                               7,426      1,490      6,351      6,252     16,706       38,225
  Industrial (including agricultural)                     24,978      1,707     10,726      1,028     18,207       56,646
  Public authority and other                               2,529        962      1,685      1,218          -        6,394
                                                        --------   --------   --------   --------   --------   ----------
   Total                                                  57,775      8,364     33,456     18,327     60,371      178,293
                                                   
TRANSPORTATION VOLUMES (3)                                 5,694        562     16,936      3,342     17,612       44,146
                                                        --------   --------   --------   --------   --------   ----------
TOTAL VOLUMES HANDLED (3)                                 63,469      8,926     50,392     21,669     77,983      222,439
                                                        ========   ========   ========   ========   ========   ==========
                                                   
OTHER STATISTICS                                   
  Operating revenues (000's)                            $203,409   $ 53,288   $153,203   $ 73,844   $353,381   $  837,125
  Gross plant (000's)                                   $278,180   $103,809   $158,918   $125,531   $476,855   $1,143,293
  Net plant (000's)                                     $168,014   $ 74,816   $ 96,252   $ 74,485   $301,699   $  715,266
  Miles of pipe                                           13,163      2,090      3,570      3,817      7,523       30,163
  Employees (4)                                              609        167        373        268      1,068        2,485
  Communities served                                          92         41        163        123        383          802
</TABLE>

See footnotes on page 7.

                                       8
<PAGE>
 
  The non-utility business is comprised of the operations of UCG Storage and UCG
Energy. Their net income for 1997, 1996 and 1995 is recapped below:

<TABLE>
<CAPTION>
 
                                 1997     1996    1995
                                -------  ------  ------
<S>                             <C>      <C>     <C>
                                    (In thousands)
Non-utility net income:
 Propane                        $  (89)  $1,276  $1,123
 Rental                          1,109    1,237   1,693
 Interest in WMLLC and other     1,616    1,092     634
 Storage                           739      806     740
                                ------   ------  ------
  Total                         $3,375   $4,411  $4,190
                                ======   ======  ======
</TABLE>

          The Company's Propane Division sells and transports propane to both
wholesale and retail customers.  Propane statistics for 1997, 1996 and 1995 are
shown below.  The division sold 33 million gallons of propane in 1997 as
compared with 41 million gallons in 1996.  The decrease in volume was the result
of winter weather that was 7% warmer than normal in 1997.

PROPANE STATISTICS: 

<TABLE>
<CAPTION> 

                             1997      1996      1995
                           -------   -------   -------
                                (In thousands)
<S>                        <C>       <C>       <C>  
Sales
 Retail                    $19,201   $21,434   $15,932
 Wholesale                  10,349    13,296     6,192
                           -------   -------   -------
                            29,550    34,730    22,124
Cost of sales               20,084    23,832    13,038
                           -------   -------   -------
Gross profit               $ 9,466   $10,898   $ 9,086
                           =======   =======   =======
Gross margin % of sales       32.0%     31.4%     41.1%
Gallons                     32,975    40,723    28,854
</TABLE>

GAS SALES

          The Company's natural gas distribution business is seasonal and highly
dependent on weather conditions in the Company's service areas.  Gas sales to
residential and commercial customers are greater during the winter months than
during the remainder of the year.  The volumes of such sales during the winter
months will vary with the temperatures during such months.  The seasonal nature
of the Company's sales to residential and commercial customers is offset
partially by the Company's sales in the

                                       9
<PAGE>
 
spring and summer months to its agricultural customers in Texas, Colorado and
Kansas who utilize natural gas to operate irrigation equipment.  The Company
also has weather normalization adjustments in its rate jurisdictions in
Tennessee and Georgia, which serve approximately 170,000 customers.  The
Company's management believes that the Company has lessened its sensitivity to
weather risk by diversifying its operations into geographic areas having
different weather patterns.

          In addition to weather, the Company's revenues are affected by the
cost of natural gas and economic conditions in the areas that the Company
serves.  Higher gas costs, which the Company is generally able to pass through
to its customers under purchased gas adjustment clauses, may cause customers to
conserve, or, in the case of industrial customers, to use alternative energy
sources.

          In recent years, natural gas market conditions have changed. Natural
gas prices to distributors have become more volatile and the number of competing
marketers of natural gas has increased. The Company's gas marketing subsidiaries
purchase gas to address requirements for large volume customers in certain
highly competitive markets.

          In certain instances, customers purchase gas directly from others
instead of from the Company and the Company transports such gas through its
distribution systems to the customers' facilities for a fee.  Although
transportation of customer-owned gas reduces the Company's operating revenues
and corresponding purchased gas cost, the transportation revenues received by
the Company may offset the loss to gross profit.

          The Company's distribution systems have experienced aggregate peak day
deliveries of approximately 1.5 billion cubic feet ("Bcf") per day.  The Company
has the ability to curtail deliveries to certain customers under the terms of
interruptible contracts and applicable state statutes or regulations which
enables it to maintain its deliveries to high priority customers. The Company
has not imposed curtailment in its Energas Division since the Company began
independent operations in 1983 or in its Trans La Division since the Company
acquired TLG in 1986.  The Western Kentucky Division curtailed deliveries to
certain interruptible customers during exceptionally cold periods in December
1989, January 1994 and during the winter of 1996. Neither the Greeley Gas
Division nor its predecessor, GGC, have curtailed deliveries to its sales
customers since prior to 1980. The United Cities Division curtails interruptible
service customers from time to time each year in accordance with the
interruptible contracts and tariffs.

                                       10
<PAGE>
 
GAS SUPPLY

          The Western Kentucky Division's gas supply is delivered by the
following pipelines:  Texas Gas, Tennessee Gas, Trunkline and ANR, except that a
small percentage of the requirements are being purchased directly from
intrastate producers that are connected directly to its distribution system.
During 1997, the Western Kentucky Division purchased its supply from various
producers and marketers including Texaco Gas Marketing, Union Pacific Fuels,
Vastar Gas Marketing, Duke Energy, LG&E Natural and Natural Gas Clearinghouse.

          The United Cities Division is served by thirteen interstate pipelines.
The majority of the volumes are transported through East Tennessee Pipeline,
Southern Natural Gas and Williams Natural Gas.  During 1997, the United Cities
Division purchased its supply from various producers and marketers including
TransCanada, Texaco Gas Marketing, Woodward Gas Marketing, and Williams Energy
Service Company.

          Colorado Interstate Gas Company, Williams Natural Gas, Public Service
Company of Colorado, and Northwest Pipeline are the principal transporters of
the Greeley Gas Division's requirements.  Additionally, the Greeley Gas Division
purchased substantial volumes from producers that are connected directly to its
distribution system.  During 1997, the Greeley Gas Division's primary suppliers
were Union Pacific Fuels, Williams Energy Service Company, Duke Energy,
Interenergy and WESTAR.

          The Energas Division receives sales and transportation service from
various KN affiliates.  Also, the Company purchases a significant portion of its
supply from Pioneer Natural Resources (formerly Mesa) which is connected
directly to the Company's Amarillo, Texas distribution system.  During 1997,
other major suppliers included Texaco Gas Marketing, Enron, and Natural Gas
Clearinghouse.

          Louisiana Intrastate Gas Company ("LIG"), Acadian Pipeline, Koch
Gateway and Texas Gas Transmission Company pipelines delivered most of the Trans
La Division's requirements.  The Trans La Division purchased its supply from
various producers and marketers including Acadiana Gas Marketing, Koch Gas
Marketing, LL&E and Engage Energy.

          The Company owns and operates numerous natural gas storage facilities
in Kentucky and Kansas which are used to help meet customer requirements during
peak demand periods and to reduce the need to contract for additional pipeline
capacity to meet such peak demand periods.  Additionally, the Company operates
various propane plants and a liquid natural gas ("LNG") plant for peak shaving
purposes.  The Company also contracts for storage service in underground storage
facilities of many of the interstate pipelines serving it.  See "Item 2.
Properties" for further information regarding the peak shaving facilities.

                                       11
<PAGE>
 
          The United Cities Division normally injects gas into pipeline storage
systems and UCG Storage's storage system during the summer months and withdraws
it in the winter months.  At the present time, the underground storage
facilities of UCG Storage have a maximum daily output capability of
approximately 45,000 Mcf.

          The United Cities Division has the ability to serve approximately 60%
of its peak day load through the use of company owned storage facilities,
storage contracts with its suppliers and peaking facilities throughout the
system.  This ability provides the operational flexibility and security of
supply required to meet the needs of the highly weather sensitive residential
and commercial market.

REGULATION AND RATES

          Regulation.  In the Energas Division, the governing body of each
municipality served by the Company has original jurisdiction over all utility
rates, operations, and services within its city limits except with respect to
sales of natural gas for vehicle fuel and agricultural use.  The Company
operates pursuant to non-exclusive franchises granted by the municipalities it
serves, which franchises are subject to renewal from time to time.  The
franchises granted to the Company permit it to conduct natural gas distribution
within the municipalities' incorporated limits. The Railroad Commission of Texas
("Railroad Commission") has exclusive appellate jurisdiction over all rate and
regulatory orders and ordinances of the municipalities and exclusive original
jurisdiction over rates and services to customers not located within the limits
of a municipality.  In Texas, rates for large industrial customers are routinely
set by contract negotiation between the Company and its customers pursuant to
statutory standards and are filed with and subject to the governmental authority
of the municipalities or the Railroad Commission, depending on whether the
customer is located inside or outside the limits of a municipality.
Historically, the Company's rates for large industrial customers have been
accepted as filed.  Agricultural sales in Texas are not regulated, except that
prices for agricultural sales cannot exceed the prices the Company charges the
majority of its commercial or other similar large-volume users in Texas.

          The Trans La Division is regulated by the Louisiana Public Service
Commission ("Louisiana Commission"), which regulates utility services, rates,
and other matters.  In most of the parishes and incorporated areas in which the
Company operates in Louisiana, it does so pursuant to a non-exclusive franchise
granted by the governing authority of each parish or incorporated area.  The
franchise gives the Company the general privilege to operate its gas
distribution business in, as well as the right to install its distribution lines
along the roadways of, the parish or the incorporated area.  Direct sales of
natural gas to industrial customers in Louisiana who utilize the gas for fuel or

                                       12
<PAGE>
 
in manufacturing processes and sales of natural gas for vehicle fuel are exempt
from regulation.

          The Western Kentucky Division is regulated by the Kentucky Public
Service Commission ("Kentucky Commission"), which regulates utility services,
rates, issuances of securities, and other matters.  The Company operates in the
various incorporated cities served by it in Kentucky pursuant to non-exclusive
franchises granted by such cities.  The franchises grant to the Company the
right to operate its gas distribution business in the city and to install its
distribution lines and related equipment in and along the city's public rights-
of-way.  Sales of natural gas for use as vehicle fuel in Kentucky are not
subject to regulation.

          The Greeley Gas Division is regulated by the Colorado Public Utilities
Commission ("Colorado Commission"), the Kansas Corporation Commission, and the
Missouri Public Service Commis  sion with respect to accounting, rates and
charges, operating matters, and the issuance of securities.  The Company
operates in the various incorporated cities served by it in the states of
Colorado, Kansas and Missouri under terms of non-exclusive franchises granted by
the various cities.  The franchises grant to the Company, among other things,
the right to install and operate its gas distribution system within the city
limits.  Most of the Greeley Gas Division's wholesale gas suppliers are
regulated by various federal and state commissions.

          In each state in which the United Cities Division operates, its rates,
services and operations as a natural gas distribution company are subject to
general regulation by the state public service commission.  Its pipeline
suppliers, but not the United Cities Division or the other utility divisions,
are subject to regulation by the Federal Energy Regulatory Commission ("FERC").
The United Cities Division's rates, which vary in its different regulatory
jurisdictions, are determined by its cost of purchased gas, rate of return, type
of service and volume of use by the customer.  In addition, the issuance of
securities by the Company is subject to approval by the state commissions,
except in South Carolina and Iowa.  Missouri only regulates the issuance of
secured debt.  The United Cities Division operates in each community, where
necessary, under a franchise granted by the municipality for a fixed term of
years.  To date it has been able to renew franchises and expects to continue to
do so in the future.

          The Company is also subject to regulation by the United States
Department of Transportation with respect to safety requirements in the
operation and maintenance of its gas distribution facilities.  The Company's
distribution operations are also subject to various state and federal laws
regulating environmental matters.  From time to time the Company receives
inquiries regarding various environmental matters.  The Company believes that
its properties and operations substantially comply with and are operated in
substantial conformity with applicable

                                       13
<PAGE>
 
safety and environmental statutes and regulations.  There are no administrative
or judicial proceedings arising under environmental quality statutes pending or
known to be contemplated by governmental agencies which, if adversely
determined, would have a material adverse effect on the Company.

          Rates.  Approximately 89% of the Company's revenues in fis  cal 1997
was derived from sales at rates set by or subject to approval by local or state
authorities.  The method of determin  ing regulated rates varies among the
twelve states in which the Company has utility operations.  As a general rule,
the regulatory authority reviews the Company's rate request and establishes a
rate structure intended to generate revenue sufficient to cover the Company's
costs of doing business and provide a reasonable return on invested capital.

          Substantially all of the sales rates charged by the Company to its
customers fluctuate with the cost of gas purchased by the Company.  Rates
established by regulatory authorities are adjusted for increases and decreases
in the Company's purchased gas cost through automatic purchased gas adjustment
mechanisms. Therefore, while the Company's operating revenues may fluctuate,
gross profit (which is defined as operating revenues less purchased gas cost) is
generally not eroded or enhanced because of gas cost increases or decreases.

          The Georgia Commission and Tennessee Regulatory Authority have
approved Weather Normalization Adjustments ("WNAs") that allow the United Cities
Division to increase the base rate portion of customers' bills when weather is
warmer than normal and decrease the base rate when weather is colder than
normal. The net effect of the WNAs was an increase (decrease) in revenues of
$2,643,000, $(2,612,000) and $1,030,000 in 1997, 1996 and 1995, respectively.

                                       14
<PAGE>
 
          The following table sets forth the major rate requests made by the
Company during the most recent five years and the action taken on such requests:

<TABLE>
<CAPTION>
                                       Effective      Amount       Amount
      Jurisdiction                        Date       Requested    Received
      ------------                    ------------  -----------  ----------  
<S>                                   <C>           <C>          <C>  
Texas                               
  West Texas System                       11/18/94  $2,581,000   $1,702,000(a)
                                          11/01/96   7,676,000    5,800,000(a)
                                   
  Amarillo                                11/25/92   4,398,000    2,130,000
                                   
Louisiana                                 03/01/93          (b)     730,000(b)
                                          03/01/94          (b)   1,058,000(b)
                                          03/01/95          (b)   1,071,000(b)
                                   
Kentucky                                  11/01/95   7,665,000    2,300,000(c)
                                          03/01/96                1,000,000(c)
                                   
Colorado                                  05/01/94   4,527,000    3,246,000
                                  
Kansas                                    12/01/93   2,604,000    2,088,000(d)
                                          09/01/95   4,230,000    2,700,000(e)
                                   
Missouri                                  10/14/95   1,100,000      903,000
                                   
South Carolina                            02/07/95     341,000      253,000
                                   
Tennessee                                 11/15/95   3,951,000    2,227,000
                                   
Iowa                                      05/17/96     750,000      410,000
                                   
Georgia                                   12/02/96   5,003,000    3,160,000
                                   
Illinois                                  07/09/97   1,234,000      428,000
                                   
Virginia                                  09/29/95     810,000      103,000
</TABLE>

(a) These increases include $200,000 and $500,000 applicable to areas outside
    the city limits which became effective in January 1995 and April 1997,
    respectively.
(b) A September 1992 rate order approved a Rate Stabilization Clause ("RSC") for
    three years which provided for an annual adjustment of rates to reflect
    changes in expenses and investment.  The RSC provided the Company the
    opportunity to earn a return on common equity between 11.75% and 12.25%.
(c) The Kentucky rate order provided an increase of $2,300,000, lowered
    depreciation rates effective November 1, 1995 and provided an additional
    $1,000,000 beginning March 1, 1996. The order also included a provision for
    a pilot demand side management program which could cost up to $450,000
    annually.
(d) This increase is applicable to the service area of the Greeley Gas Division.
(e) This increase is applicable to the service area of the United Cities
    Division.

                                       15
<PAGE>
 
  COMPETITION

          The Company is not currently in significant direct competition with
any other distributors of natural gas to residential and commercial customers
within its service areas. However, the Company does compete with other natural
gas suppliers and suppliers of alternate fuels for sales to industrial and
agricultural customers.

          The Company competes in all aspects of its business with alternative
energy sources, including, in particular, electrici  ty.  Competition for the
residential and commercial customers is increasing.  Promotional incentives,
improved equipment efficien  cies, and promotional rates all contribute to the
acceptability of electric equipment.  In the United Cities Division, #2 and #6
fuel oil are the primary competition for industrial customers. In addition,
certain customers, primarily industrial, may have the ability to by-pass the
Company's distribution system by connecting directly with a pipeline.

          Beginning in 1985, changes in the federal regulatory environment
through FERC orders and conditions related to markets and gas supply in the
United States have brought increased competition into the natural gas industry.
In 1993, FERC Order 636 was implemented by the interstate pipelines that serve
the United Cities and Western Kentucky Divisions, but FERC policies have not had
a direct impact upon the Company's Energas, Greeley Gas and Trans La Divisions
which are primarily supplied by intrastate pipelines.  However, competition for
large volume customers in the United Cities and Western Kentucky Divisions and
other service areas has increased as a result of FERC Order 636. The Company has
sought regulatory approvals for competitive pricing on a case by case basis.

          The Company participates in the operation of public refueling
facilities for the sale of compressed natural gas ("CNG") for vehicular use.
The most recent of these were opened in Greeley, Colorado in September 1996, at
West Texas A&M University in Canyon, Texas in August 1995, and in Owensboro,
Kentucky in April 1995.  Prior to that time, the Company provided CNG for
vehicular use only in limited situations (such as for school buses in certain
school districts and for the fleet vehicles of certain businesses).  With the
opening of these public refueling stations the Company began competing with
gasoline for vehicular fuel sales.  All of these facilities, except those in
Greeley, Colorado and at West Texas A&M, are located at existing local gasoline
stations.

          The United Cities Division has received approval from all the
regulatory authorities in the states in which it operates, except Iowa, to place
into effect a negotiated tariff rate which allows the United Cities Division to
maintain industrial loads at lower margin rates.  Iowa has rules which allow for
flexible rates.  These rates are competitive with the price of alternative
fuels.  In addition, certain industrial customers have changed

                                       16
<PAGE>
 
from firm to interruptible rate schedules in order to obtain natural gas at a
lower cost.  Additionally, the United Cities Division has received approval from
all state regulatory authorities to provide transportation service of customer-
owned gas.

          UCG Energy's propane subsidiary is in competition with other suppliers
of propane, natural gas and electricity.  Competition exists in the areas of
price and service.  The wholesale cost of propane is subject to fluctuations
primarily based on demand, availability of supply and product transportation
costs.

          UCG Energy, through its 45% interest in WMLLC, competes with other
natural gas brokers in obtaining natural gas supplies for customers.  UCG Energy
also competes with other rental companies.

          UCG Storage charges rates to the United Cities Division that are
subject to review by the various commissions in the states within which the
storage service is provided.  Therefore, UCG Storage's rates must be competitive
with other storage facilities.  UCG Storage also stores natural gas for WMLLC.
As a result, UCG Storage is in competition with other companies that store
natural gas as to rates charged and deliverability of natural gas.  Storage
agreements between UCG Storage and the United Cities Division give it first
priority to any storage services.

Employees

          At September 30, 1997, the Company employed 2,679 persons. See
"Utility Sales and Statistical Data by Business Unit - 1997" for the number of
employees by business unit.  As discussed in Management's Discussion and
Analysis, the Company is in the process of downsizing and restructuring in
connection with the integration of UCGC and its Customer Service Initiative.
The projected complement at the end of fiscal 1998 is currently estimated at
2,223 persons.

ITEM 2.  PROPERTIES

          The Company owns an aggregate of 30,902 miles of underground
distribution and transmission mains throughout its gas distribution systems.
These mains are located on easements or right-of-ways granted to the Company,
which generally provide for perpetual use.  The Company maintains its pipelines
through a program of continuous inspection and repair and believes that its
pipeline system is in good condition.  The Company also owns and operates nine
peak shaving plants with a total capacity of approximately 1,050,000 gallons
that can produce an equivalent of 19,459 Mcf daily and an LNG storage facility
with a capacity of 500,000 Mcf which can inject a daily volume of 30,000 Mcf in
the system, as well as underground storage fields which are used to supplement
the supply of natural gas in periods of peak demand. It has seven underground
gas storage facilities in Kentucky and four in Kansas that have a total storage
capacity of

                                       17
<PAGE>
 
approximately 21.1 Bcf.  However, approximately 10.0 Bcf of gas in the storage
facilities must be retained as cushion gas to maintain reservoir pressure.  The
maximum daily delivery capability of the storage facilities is approximately 154
MMcf.

          Substantially all of the Company's properties in its Greeley Gas
Division and United Cities Division with recorded values of approximately $83.4
million and $314.6 million, respectively, are subject to liens under First
Mortgage Bonds assumed by the Company in its mergers with GGC and UCGC.  At
September 30, 1997, the liens secured $17.0 million of outstanding 9.4% Series J
First Mortgage Bonds due May 1, 2021, and $113.0 million of outstanding Series
N, P, Q, R, S, T, U and V First Mortgage Bonds due at various dates from 2004
through 2022.

          In 1996 the Company consolidated its administrative offices in Dallas,
Texas under one lease.  The Company also maintains field offices throughout its
distribution system, substantially all of which are located in leased premises.

          Net non-utility property at September 30, 1997 amounted to
approximately $19.5 million for propane equipment, $17.4 million for underground
storage facilities, and $19.7 million for rental buildings and equipment.

          The Company holds franchises granted by the incorporated cities and
towns that it serves.  At September 30, 1997, the Company held 413 such
franchises having terms generally ranging from five to 25 years.  The Company
believes that each of its franchises will be renewed.

ITEM 3.  LEGAL PROCEEDINGS

          See Note 5 of notes to consolidated financial statements.

ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

          No matters were submitted to a vote of security holders during the
fourth quarter of fiscal 1997.

                                       18
<PAGE>
 
                      EXECUTIVE OFFICERS OF THE REGISTRANT

       The following table sets forth certain information as of September 30,
1997, regarding the executive officers of the Company.  It is followed by a
brief description of the business experience of each executive officer during
the past five years.

<TABLE>
<CAPTION>
 
                                Years of
    Name                  Age   Service    Office Currently Held
    ----                  ---   --------   ---------------------
<S>                       <C>     <C>      <C>
Robert W. Best            50       -       Chairman, President and Chief Executive Officer
Larry J. Dagley           49       -       Executive Vice President and Chief Financial Officer
J. Charles Goodman        36      13       Executive Vice President of  Operations
Donald E. James           50      16       Senior Vice President of Public Affairs
Mary S. Lovell            46       9       Senior Vice President of  Utility Services
Glen A. Blanscet          40      12       Vice President, General  Counsel and Corporate  Secretary
Wynn D. McGregor          44       9       Vice President, Human Resources
</TABLE>

          Robert W. Best was named Chairman, President and Chief Executive
Officer and was appointed to the Board of Directors in March 1997.  He
previously served as Senior Vice President -regulated businesses, for
Consolidated Natural Gas Company of Pittsburgh, Pennsylvania, since January
1996, responsible for its transmission and distribution companies.  He
previously served as President of Texas Gas Transmission Company of Owensboro,
Kentucky, and Houston, Texas, from 1985 to 1995, and from 1992 to 1995 he was
President of Transco Gas Pipeline.

          Larry J. Dagley was named Executive Vice President and Chief Financial
Officer effective May 1, 1997.  From August 1995 to May 1997, he served as
Senior Vice President and Chief Financial Officer of Pacific Enterprises, a Los
Angeles, California based utility holding company whose principal subsidiary is
Southern California Gas Co., the nation's largest gas distribution utility.
From 1985 until joining Pacific Enterprises, he served as Senior Vice President
and Controller (1985-1993) and Senior Vice President and Chief Financial Officer
(1993-1995) of Transco Energy Company, a Houston, Texas based natural gas
pipeline company.  Prior to joining Transco, Mr. Dagley was an audit partner
with Arthur Andersen & Co., where he supervised audits and financial consulting
engagements in the energy industry.

          J. Charles Goodman was named Executive Vice President, Operations in
April 1995.  He previously served as President of the Company's Trans La Gas
Division from February 1993 until April 1995 and as Chief Engineer from February
1989 until February 1993.

                                       19
<PAGE>
 
          Donald E. James was named Senior Vice President - Public Affairs in
May 1995.  He previously served as Senior Vice President and General Counsel
from January 1994 to May 1995, Senior Vice President - General Counsel and
Corporate Secretary from May 1993 until August 1993, and Senior Vice President
and General Counsel from May 1989 until May 1993.

          Mary S. Lovell was named Senior Vice President, Utility Services in
May 1995.  She previously served as Vice President, Rates and Regulatory Affairs
from August 1990 to May 1995.

          Glen A. Blanscet was named Vice President, General Counsel and
Corporate Secretary in May 1995.  He previously served as Assistant General
Counsel and Corporate Secretary from January 1994 to May 1995, and Assistant
General Counsel from July 1988 to December 1993.

          Wynn D. McGregor was named Vice President, Human Resources in January
1994.  He previously served the Company as Director of Human Resources from
February 1991 to December 1993 and as Manager, Compensation and Employment from
December 1987 to January 1991.

                                    PART II

ITEM 5.  MARKET FOR THE REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER
         MATTERS

     The Company's stock trades on the New York Stock Exchange under the trading
symbol "ATO".  The high and low sale prices and dividends paid per share of the
Company's common stock for fiscal 1997 and 1996 are listed below.  Dividends
paid for 1997 and 1996 have been restated to reflect the merger of Atmos and
UCGC accounted for as a pooling of interests.  Atmos' actual dividends paid in
fiscal 1997 were $.25 for each of the first three quarters and $.255 for the
fourth quarter, and $.24 per quarter for each quarter of fiscal 1996.  The high
and low prices listed are the actual closing NYSE quotes for Atmos shares.
<TABLE>
<CAPTION>
 
                                  1997                       1996
                    -----------------------------  --------------------------
                                        Dividends                   Dividends
                     High     Low         paid      High      Low     paid   
Quarter ended:    --------   -----        ----     ------    ------   -----  
<S>               <C>        <C>        <C>       <C>      <C>      <C>      
 December 31       $ 24 3/4   $  22 5/8  $.251     $23      $18       $.245  
 March 31            26 1/4      22 1/8   .252      23       21        .245  
 June 30             25 1/2      22 1/2   .252      31       22 3/4    .245  
 September 30        27 7/8      24 1/2   .255      30 5/8   20 7/8    .245  
                                         -----                        ----- 
                                         $1.01                        $ .98 
                                         =====                        ===== 
</TABLE>

          See Note 7 of notes to consolidated financial statements for
restriction on payment of dividends. The number of record holders of the
Company's common stock on September 30, 1997 was 29,867.

                                       20
<PAGE>
 
ITEM 6.  SELECTED FINANCIAL DATA

     The following table sets forth selected financial data of the Company and
should be read in conjunction with the consolidated financial statements
included herein.  Amounts for 1997 reflect the pooled operations of Atmos and
the United Cities Division.  Prior year amounts have been restated for the
pooling.
<TABLE>
<CAPTION>
                                                      Year ended September 30,
                                      ----------------------------------------------------
                                          1997       1996        1995      1994      1993
                                      ----------   ----------  --------  --------  ------- 
                                               (In thousands, except per share data)
<S>                                   <C>          <C>         <C>       <C>       <C> 
Operating revenues                    $  906,835  $  886,691  $749,555  $826,302  $794,893
                                      ==========  ==========  ========  ========  ========
Net income                            $   23,838  $   41,151  $ 28,808  $ 26,772  $ 29,694
                                      ==========  ==========  ========  ========  ========
Net income per share                  $      .81  $     1.42  $   1.06  $   1.05  $   1.21
                                      ==========  ==========  ========  ========  ========
Cash dividends per share              $     1.01  $      .98  $    .96  $    .91  $    .82
                                      ==========  ==========  ========  ========  ========
Total assets at end of year           $1,088,311  $1,010,610  $900,948  $829,385  $786,739
                                      ==========  ==========  ========  ========  ========
Long-term debt at end of year         $  302,981  $  276,162  $294,463  $282,647  $257,696
                                      ==========  ==========  ========  ========  ========
</TABLE>

                                       21
<PAGE>
 
ITEM 7.   MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
          RESULTS OF OPERATIONS

INTRODUCTION

          This section provides management's discussion of Atmos Energy
Corporation's ("the Company" or "Atmos") financial condition, cash flows and
results of operations with specific information on liquidity, capital resources
and results of operations.  It includes management's interpretation of such
financial results, the major factors expected to affect future operating
results, and future investment and financing plans. This discussion should be
read in conjunction with the Company's consolidated financial statements and
notes thereto.  For financial and operating statistics, please see the tables of
restated and pooled data included herein.

Cautionary Statement under the Private Securities Litigation Reform Act of 1995

          The matters discussed or incorporated by reference in this Annual
Report on Form 10-K contain "forward-looking statements" within the meaning of
Section 27A of the Securities Act of 1933 or Section 21E of the Securities
Exchange Act of 1934.  All statements other than statements of historical facts
included in this Report including, but not limited to, those contained in this
Item 7, "Management's Discussion and Analysis of Financial Condition and Results
of Operations", regarding the Company's financial position, business strategy
and plans and objectives of management of the Company for future operations, are
forward-looking statements made in good faith by the Company. Although the
Company believes that the expectations reflected in such forward-looking
statements are reasonable, it can give no assurance that such expectations will
prove to have been correct. Such forward-looking statements are subject to risks
and uncertainties that could cause actual results to differ materially from
those expressed or implied in the statements relating to the Company's
operations, markets, services, rates, recovery of costs, availability of gas
supply, and other factors. These risks and uncertainties include, but are not
limited to, economic, competitive, governmental, weather, technological and
other factors.

Organization

          The Company distributes, sells and transports natural gas and propane
to residential, commercial, industrial and agricultural customers in thirteen
states. The natural gas distribution business is operated through its five
utility divisions, rather than as a holding company.  Such utility business is
subject to regulation by state and/or local authorities in each of the states in
which the Company operates. In addition, the Company's business is affected by
seasonal weather patterns, competition within the energy industry, and economic
conditions in the areas that the Company serves.

                                       22
<PAGE>
 
          With the completion of the merger with United Cities Gas Company this
year, Atmos is the 12th largest natural gas distribution utility company in
terms of total customers in the country, and the fifth largest pure natural gas
utility.  Since its organization in 1983, the Company has sought to expand its
customer base and to diversify the weather patterns, local economic conditions,
and regulatory environments in which it operates.  As part of this strategy, the
Company has completed major acquisitions in 1986, 1987, 1993 and 1997.  In
addition to growing through acquisitions, the Company's strategy includes
building the Atmos team, running the utility operations exceptionally well,
increasing the size and market share of the non-utility operations (gas
marketing and propane), and developing plans to participate in retail energy
services behind the meter.

          In connection with its merger with United Cities Gas Company, as
discussed in Note 2 of notes to consolidated financial statements, the Company
acquired certain non-utility subsidiaries which contributed approximately 14% of
1997 net income and offer potential growth opportunities.

          One non-utility subsidiary, UCG Storage, was formed in 1989 to provide
natural gas storage services.  In 1989, a natural gas storage field was
purchased in Kentucky to supplement natural gas used by customers in Tennessee.
In addition, natural gas storage fields located in Kansas were sold to UCG
Storage and are used to supplement natural gas requirements of Kansas customers.

          The other non-utility subsidiary, UCG Energy, incorporated in 1965,
leases appliances, real estate and equipment, and vehicles to the United Cities
Division and others.  UCG Energy also owns a 45% interest in WMLLC of Houston,
Texas, which provides natural gas services to industrial customers,
municipalities and local distribution companies in the Southeast and Midwest,
including the United Cities Division.  Management services include contract
negotiation and administration, load forecasting, nominations and scheduling,
storage acquisition, capacity utilization and pricing/risk management.  WMLLC
was formed in 1995.

          UCG Energy has two wholly-owned subsidiaries, United Cities Propane
Gas of Tennessee, Inc. and UCG Leasing, Inc.  United Cities Propane Gas of
Tennessee, Inc. is engaged in the retail and wholesale distribution and
transportation of propane (LP) gas.  As of September 30, 1997, the propane
operation served 29,097 customers in Kentucky, North Carolina, Tennessee and
Virginia.  UCG Leasing, Inc. was incorporated under the laws of Georgia in 1987
and leases vehicles, equipment and real estate to the United Cities Division.  A
table of non-utility net income for 1997, 1996 and 1995 appears on page 9
herein.

                                       23
<PAGE>
 
Acquisitions and Mergers

     The Company has expanded its customer base and sought to diversify the
regulations, weather patterns and local economic conditions to which it is
subject through acquisitions in fiscal years 1997, 1994, 1987, and 1986. The
Company plans to continue its acquisition strategy to add new customers and
service areas for both natural gas and propane. It has an excellent track record
of acquiring LDC operations that provide diversity in weather, regulatory
patterns, economies and markets. It has achieved synergies and benefits quickly,
while preserving brand equity.

Ratemaking Activity

     Rates and regulatory initiatives are at the heart of Atmos' utility
operations and are important to both shareholders and customers.  Atmos'
objective is to achieve rates that provide for fair returns for its shareholders
while having these rates at low, competitive levels for its customers.  As the
energy environment and industry change, the process for setting rates in the
future may also need to change.  In that regard, the Company is participating in
a performance-based rates experimental program in Tennessee, which is designed
to reward the Company for performing better than certain benchmarks relating to
purchased gas cost.  A similar program is underway in Georgia.  Atmos believes
that performance-based rate programs benefit customers and reward efficient
service providers like Atmos, and Atmos intends to seek gas cost incentive
arrangements and incentive rates in every jurisdiction possible.

     The Company received rate increases totaling $9.4 million, $6.8 million,
and $5.8 million effective in fiscal 1997, 1996 and 1995, respectively.  For
further information regarding these rate increases please see Note 3 "Rates" in
notes to consolidated financial statements.

Weather and Seasonality

     The Company's natural gas and propane distribution businesses are seasonal
due to weather conditions in the Company's service areas.  Sales are affected by
winter heating season requirements.  Sales to agricultural customers (who use
natural gas as fuel in the operation of irrigation pumps) during the period from
April through September are affected by rainfall amounts.  These factors
generally result in higher operating revenues and net income during the period
from October through March of each year and lower operating revenues and either
net losses or lower net income during the period from April through September of
each year.  For further seasonality information, please see the Supplementary
Quarterly Financial Data following the notes to consolidated financial
statements herein.

                                       24
<PAGE>
 
     The Georgia Public Service Commission and the Tennessee Regulatory
Authority have approved Weather Normalization Adjustments ("WNAs").  The WNAs,
effective October through May each year in Georgia and November through April
each year in Tennessee, allow the United Cities Division to increase the base
rate portion of customers' bills when weather is warmer than normal and decrease
the base rate when weather is colder than normal.  The net effect of the WNAs
was an increase/(decrease) in revenues of $2,643,000, ($2,612,000) and
$1,030,000 in 1997, 1996 and 1995, respectively.

     The Company has not sought weather normalization clauses in its other rate
jurisdictions because of the effect of its geographical diversification strategy
and the potential for increased profits in unusually cold years.

Environmental Matters

     The Company is involved in certain environmental matters as discussed in
Note 5 "Contingencies" of notes to consolidated financial statements.

RESULTS OF OPERATIONS

YEAR ENDED SEPTEMBER 30, 1997 COMPARED WITH YEAR ENDED SEPTEMBER 30, 1996

     To assist in management's discussion of results of operations, the
following table presents the effects for fiscal years 1997, 1996 and 1995 of
certain non-recurring charges as well as weather which affected reported
results.

<TABLE>
<CAPTION>
                                                1997            1996              1995
                                           --------------  ---------------   --------------
                                                     Per              Per              Per
                                           Amount   Share  Amount    Share   Amount   Share
                                           ------   -----  ------    -----   ------   -----
                                               (In thousands, except per share data)
<S>                                        <C>      <C>    <C>       <C>     <C>      <C> 
Net income as                    
  reported                                 $23,838  $ .81  $41,151   $1.42   $28,808  $1.06
                                                                                      
Non-recurring charges:                                                                
  Management reorganization                  2,800    .10        -       -         -      -
  Reserve for potential sharing of                                                       
   merger and integration costs             12,630    .43        -       -         -      -
                                           -------  -----  -------   -----   -------  -----
Normalized net income except for                                                      
 effects of weather                         39,268   1.34   41,151    1.42    28,808   1.06
                                 
Effects of weather                           3,571    .12   (1,838)   (.06)    5,000    .18
                                           -------  -----  -------   -----   -------  -----
Normalized net income                      $42,839  $1.46  $39,313   $1.36   $33,808  $1.24
                                           =======  =====  =======   =====   =======  =====
</TABLE>

                                       25
<PAGE>
 
Net income as reported

          The Company reported net income of $23.8 million, or $.81 per share,
on operating revenues of $906.8 million for the fiscal year ended September 30,
1997.  The 1997 net income includes the effects of non-recurring after-tax
charges related to management reorganization ($2.8 million or $.10 per share)
and reserves related to the UCGC merger and integration ($12.6 million or $.43
per share).  Excluding the effect of these charges, the Company's net income
would have been $39.3 million or $1.34 per share in 1997, compared with $41.2
million, or $1.42 per share for 1996. The 1997 results include United Cities Gas
Company, which merged with Atmos effective July 31, 1997, and prior year
operating results have been restated to reflect the pooling of interests
accounting which was used for the merger.

Non-recurring charges

          The Company completed a management reorganization in 1997 and recorded
a charge of $4.4 million ($2.8 million after-tax) in related costs.

          The cost of the UCGC merger and integration totaled approximately $17
million for the transaction costs and $32 million for the separation and other
costs.  There are substantial longer term benefits to the Company's customers
and shareholders from the merger of the two companies, which the Company expects
to result in cost savings over the next 10 years totaling about $375 million.
The Company believes a significant amount of the costs to achieve these benefits
will be recovered through rates and future operating efficiencies of the
combined operations.  Therefore, the Company recorded as regulatory assets the
costs of the merger and integration of UCGC.  However, the Company has
established a reserve of approximately $20 million ($12.6 million after-tax), to
account for costs that may not be recovered.  The Company recorded these costs
in the fourth quarter of fiscal year 1997 when the merger was completed,
separation plans were approved by the board of directors and announcements were
made to employees.  For further information regarding the merger please see Note
2 of notes to consolidated financial statements.

Effects of weather

          Annual sales volumes and revenues vary in relation to winter heating
degree days and summer irrigation demand.  The Company has weather normalization
adjustments in its rates in Georgia and Tennessee, but not in the other 10
states in which it has natural gas distribution operations.  The estimated
effect on net income of weather different from 30-year normals is included in
the previous table.  The decline in net income, excluding the charges and
reserves, was the result of the effects of warmer than normal weather during the
winter months, which negatively impacted gas throughput and sales as well as
propane sales.  In addition, the spring months were wetter than normal, which
adversely impacted

                                       26
<PAGE>
 
irrigation gas utilization.  Normal weather conditions would have added $.12 per
share to net income.

Rates

          The negative effects of weather were partially offset by rate
increases implemented in fiscal 1996 and 1997 in jurisdictions in Texas,
Kentucky, Illinois, Georgia, Iowa, Tennessee, Missouri and Virginia.  Rate
increases contributed approximately $8 million to gross profit in 1997.

                        The following table summarizes heating degree days and
volumes delivered for 1997, 1996 and 1995.
<TABLE>
<CAPTION>
 
 
                                                  Year ended September 30,
                                                 --------------------------
                                                 1997      1996       1995
                                                 ----      ----       ----
<S>                                            <C>        <C>        <C>
HEATING DEGREE DAYS                      
 Actual                                          3,909      4,043      3,706
 Percent of normal                                  98%       101%        93%
                                         
SALES VOLUMES - MMcf                     
 Residential                                    75,214     77,001     69,666
 Commercial                                     37,382     38,247     34,921
 Industrial (including agricultural)            46,417     57,863     57,290
 Public authority and other                      5,195      5,182      4,779
                                              --------   --------   --------
  Total                                        164,208    178,293    166,656
                                         
TRANSPORTATION VOLUMES - MMcf                   48,800     44,146     47,647
                                              --------   --------   --------
TOTAL VOLUMES DELIVERED - MMcf                 213,008    222,439    214,303
                                              ========   ========   ========
PROPANE - Gallons (000's)                       32,975     40,723     28,854
                                              ========   ========   ========
Total operating revenues (000's)              $906,835   $886,691   $749,555
                                              ========   ========   ========
</TABLE>

          Operating revenues increased approximately 2% to $906.8 million in
1997 from $886.7 million in 1996 due to an increase of 13% in the average sales
price per thousand cubic feet ("Mcf") of gas sold, which more than offset a 4%
decrease in total volumes delivered.  The increase in sales price reflects an
increase in the commodity cost of gas which is passed through to end users and
rate increases implemented in 1996 and 1997.  Average gas sales revenues per Mcf
increased by $.60 to $5.11 in 1997, while the average cost of gas per Mcf sold
increased $.36 to $3.51 in 1997.  The number of meters in service increased to
985,448 at September 30, 1997 compared with 976,308 at September 30, 1996. Sales
to weather sensitive residential, commercial and public authority customers
decreased approximately 2.6 billion cubic feet ("Bcf") in 1997 while sales and
transportation volumes delivered to industrial and agricultural customers
decreased approximately 6.8 Bcf.  Total sales and transportation volumes
delivered decreased 4.2% to 213.0 Bcf in 1997, as compared with 222.4 Bcf in
1996.  The decrease was primarily due to lower

                                       27
<PAGE>
 
irrigation demand as a result of cooler, wetter summer weather in West Texas.

          Gross profit increased by approximately 2% to $329.7 million in 1997
from $324.4 million in 1996.  The primary factor contributing to the higher
gross profit was annual rate increases totalling approximately $16.2 million
implemented in fiscal 1997 and 1996 in Texas, Kentucky, Tennessee, Iowa,
Missouri, Georgia, and Illinois. This was partially offset by a decrease of 9.4
Bcf or 4.2% due to the effect of warmer than normal weather and decreased
irrigation demand as a result of cooler, wetter summer weather in 1997.
Operating expenses, excluding income taxes, increased $31.2 million or 13% to
$263.0 million in 1997. The $25.5 million increase in operation expense was due
primarily to the non-recurring $20.0 million reserve for potential sharing of
merger and integration costs, and the $4.4 million charge for management
reorganization. The $3.6 million increase in depreciation was due to utility
plant additions placed in service in 1996 and 1997. Income taxes decreased to
$14.3 million for 1997 from $23.3 million for 1996. The primary reason for the
decrease was lower pre-tax profits. The effective tax rate increased slightly to
37.5% in 1997 from 36.2% in 1996. This was primarily due to increased state
income tax rates in 1997. Also, prior to the merger in 1997, UCGC's income was
subject to a slightly lower federal tax rate because of the graduated rate
structure. Operating income decreased in 1997 by approximately $17.0 million or
24% to $52.3 million. The decrease in operating income resulted primarily from
the non-recurring charges included in 1997 operating expenses as discussed
above.

          Net income decreased in 1997 by approximately 42% to $23.8 million
from $41.2 million in the prior year.  This $17.3 million decrease in net income
resulted from the $17.0 million decrease in operating income and a $1.9 million
increase in interest expense, which were partially offset by a $1.6 million
increase in other income.  The increase in interest expense was due to higher
average debt outstanding in 1997 than in 1996.  The $1.6 million increase in
other income for 1997 was primarily due to a $1.1 million increase in income
from the Company's investment in Woodward Marketing LLC, a Houston gas marketing
company.  Net income per share decreased to $.81 for 1997 from $1.42 for 1996.
Average shares outstanding increased 1% to 29,409,000 shares in 1997 from 1996.

YEAR ENDED SEPTEMBER 30, 1996 COMPARED WITH YEAR ENDED SEPTEMBER 30, 1995

          Operating revenues increased 18% to $886.7 million in 1996 from $749.6
million in 1995 due to weather that was 9% colder than in 1995 and an 11%
increase in the average sales price per Mcf sold.  Average gas sales revenues
per Mcf increased from 1995 by $.44 to $4.51 in 1996, while the average cost of
gas per Mcf sold increased $.45 to $3.15 in 1996.  The total number of natural
gas and propane customers increased to 1,002,416 at September 30, 1996 compared
with 972,572 at September 30, 1995.

                                       28
<PAGE>
 
Sales to weather sensitive residential, commercial and public authority
customers increased approximately 11.0 Bcf in 1996 while sales and
transportation volumes delivered to industrial and agricultural customers
decreased 2.9 Bcf.  Total volumes delivered increased 4% to 222.4 Bcf in 1996,
as compared with 214.3 Bcf in 1995.  Revenues from gas sales to weather
sensitive customers increased $109.9 million to $616.8 million in fiscal 1996
due to an 11% increase in average sales price and a 10% increase in volumes sold
in 1996.  The increase in volumes sold was due to weather 1% colder than normal
in 1996, as compared with 7% warmer than normal weather in 1995.  Revenues from
gas sold and transported to industrial and agricultural customers increased
$15.2 million due to a $.24 per Mcf or 8% increase in sales price, despite a
slight decrease in volumes delivered.

          Gross profit increased by approximately 8% to $324.4 million in 1996
from $300.2 million in 1995.  The primary factor contributing to the higher
gross profit in 1996 was higher volumes sold to weather-sensitive customers due
to colder weather.  The companywide average margin (sales price per Mcf less
cost of gas per Mcf) did not change significantly in 1996. Operating expenses,
excluding income taxes, increased only slightly to $231.8 million in 1996 from
$228.2 million in 1995. Income taxes increased to $23.3 million in 1996 from
$16.5 million in 1995.  The primary reason for the increase was higher pre-tax
profits.  The effective tax rate decreased slightly to 36.2% in 1996 from 36.5%
in 1995.  Operating income increased in 1996 by approximately 25% to $69.3
million from $55.4 million in 1995.  The increase in operating income resulted
primarily from the increase in 1996 gross profit, partially offset by increases
in operating expenses, primarily income taxes, as discussed above.

          Net income increased in 1996 from 1995 by approximately 43% to $41.2
million from $28.8 million in the prior year.  This increase in net income
resulted primarily from the increase in operating income, which was partially
offset by a $1.5 million increase in interest expense.  This increase in
interest expense was caused by an increase in weighted average short-term debt
outstanding in 1996.  Net income per share increased to $1.42 for 1996 from
$1.06 for 1995.  Average shares outstanding increased 7% to 28,978,000 in 1996.

CAPITAL RESOURCES AND LIQUIDITY (See "Consolidated Statements of Cash Flows")

          Because of the pooling of interests of Atmos, which has a September 30
fiscal year end, with UCGC, which had a December 31 year end, the activities of
UCGC for the quarter ended December 31, 1996 are included in the restated 1996
consolidated statement of cash flows and not the 1997 consolidated statement of
cash flows. As a result, amounts in the 1997 consolidated statement of cash
flows as reported are different than they would have been, had they included a
full 12 month's activity for UCGC.

                                       29
<PAGE>
 
          The following pro forma condensed consolidated statement of cash flows
reflects activities of both Atmos and UCGC for the full 12 months ended
September 30, 1997.

                                       (In thousands) 
Cash flows from operating activities:

 Net income                              $  23,838
 Depreciation                               47,494
 Other                                     (11,054)
                                         ---------
  Net cash provided by operating 
   activities                               60,278
 
Net cash used in investing activities     (131,286)
 
Cash flows from financing activities:
 Increase in notes payable, net             63,600
 Issuance of long-term debt                 40,000
 Repayment of long-term debt               (16,037)
 Issuance of common stock                   10,482
 Cash dividends paid                       (29,778)
                                         ---------
  Net cash provided by financing
   activities                               68,267
                                         ---------
Decrease in cash                            (2,741)
 
Cash at beginning of year                    8,757
                                         ---------
Cash at end of year                      $   6,016
                                         =========

Cash Flows from Operating Activities

     Cash flows from operating activities as reported in the consolidated
statement of cash flows totaled $68.7  million for 1997 compared with $91.7
million for 1996 and $79.1 million for 1995.  Due to non-recurring charges
recorded in 1997 and deducting UCGC's net income for the quarter ended December
31, 1996, the Company reported lower net income for the 1997 Statement of Cash
Flows as compared with 1996 and 1995. Depreciation for the full 12 months of
fiscal 1997 was $2.2 million higher than for 1996 because of increasing utility
plant in service.  Using 1997 beginning balances for UCGC as of December 31,
1996 resulted in large swings in certain seasonal asset and liability accounts
like accounts receivable and accounts payable.  Gas stored underground increased
in 1996 because of higher gas cost, but was lower in 1997 and 1995 because of
substantially lower gas prices during the summers of 1997 and 1995 when the
storage reservoirs were being refilled. The changes in deferred charges and
other assets and other current liabilities in 1997 were related to merger and
integration costs accrued and the related regulatory assets recorded in the
fourth quarter of 1997.  See "Consolidated

                                       30
<PAGE>
 
Statements of Cash Flows" for other changes in assets and liabilities.

Cash Flows from Investing Activities

     A substantial portion of the Company's cash resources is used to fund its
ongoing construction program in order to provide natural gas services to a
growing customer base.  Net cash used in investing activities totaled $121.1
million in 1997 compared with $111.9 million in 1996 and $101.4 million in 1995.
During 1995, UCGC completed construction of a twenty-eight mile main which
connects two of its fastest growing distribution systems located in Middle
Tennessee and is designed to provide the Company's current customers with the
lowest possible priced gas through increased gas supply flexibility.  Included
in the 1995 capital expenditures stated above is $5.7 million related to this
project. Capital expenditures in fiscal 1997 amounted to $122.3 million
(including $26.0 million for the Customer Service Initiative ("CSI")) compared
with $117.6 million in 1996 and $103.9 million in 1995.  Currently budgeted
capital expenditures for 1998 total $109.1 million and include approximately
$41.5 million for completing CSI, as well as funds for additional mains,
services, meters, and vehicles.  The CSI project includes application software,
related technology infrastructure and business process changes.  Benefits
related to the CSI project include enabling the Company's ability to deliver its
vision by positioning for the future, using best practices in the industry,
timely integration of new acquisitions and resolution of Year 2000 issues.
Capital expenditures for fiscal 1998 are planned to be financed from internally
generated funds and financing activities, as discussed below.

                                       31
<PAGE>
 
          The following table reflects the Company's capitalization, including
short-term debt except for the portion related to current storage gas.

<TABLE>
<CAPTION>
 
                               1997            1996
                        ---------------  ---------------
<S>                     <C>       <C>    <C>       <C>
                                 (In thousands)
Working capital
 Short-term debt(1)     $ 48,122         $ 43,350
                        ========         ========
Short-term debt          119,178  15.6%    85,138  12.0%
Long-term debt           318,182  41.6%   292,841  41.4%
Shareholders' equity     327,260  42.8%   329,582  46.6%
                        --------  ----   --------  ----
Total capitalization    $764,620   100%  $707,561   100%
                        ========  ====   ========  ====
</TABLE>
(1) Includes short-term borrowings associated with working gas inventories.

          As of the end of fiscal 1997, the debt to capitalization ratio had
increased to 57.2% from 53.4% in 1996.  The increase was primarily due to
increased cash requirements related to merger and integration costs and CSI
investments in 1997, as well as the effects of the charges and reserves
previously discussed. The Company plans to decrease the debt to capitalization
ratio to nearer its target of 50% over the next three years through cash flow
generated from operations, issuance of new common stock under its Direct Stock
Purchase Plan and ESOP, recovery of CSI and merger/integration costs and
possibly from the sale of certain real estate assets.

Future capital requirements

          Short-term borrowings are expected to continue to increase somewhat in
fiscal 1998 due to budgeted capital expenditures discussed above and scheduled
maturities of long-term debt of $15.2 million.  The Company has access to $35.0
million available under its committed lines of credit and $159.9 million
available under its uncommitted lines.

          Forward looking cash requirements beyond fiscal 1998 include capital
expenditures and possible contingencies and environmental matters as discussed
in the notes to consolidated financial statements.  The Company plans to fund
future requirements through internally generated cash flows, credit facilities
and its access to the public debt and equity capital markets.

Cash Flows from Financing Activities

     Net cash provided by financing activities totaled $47.3 million for 1997
compared with $22.0 million for 1996 and $26.1 million for 1995.  Financing
activities during these periods included issuance of common stock, dividend
payments, short-term

                                       32
<PAGE>
 
borrowings from banks under the Company's credit lines, and issuance and
repayments of long-term debt.

     Cash dividends paid. The Company paid $26.4 million in cash dividends
during 1997 (excluding dividends of $3.4 million paid by UCGC in the quarter
ended December 31, 1996) compared with $28.5 million in 1996 and $26.2 million
in 1995.  Prior to the UCGC merger in July 1997, Atmos increased its actual
annual dividend rate by $.04 in each of the 3 years presented. Including fiscal
1998, the Company has increased its dividend rate for ten consecutive years.

     Short-term financing activities.  At September 30, 1997, the Company had
committed lines of credit totaling $187.0 million, $35.0 million of which was
unused, in order to provide for short-term cash requirements.  These credit
facilities are negotiated at least annually.  At September 30, 1997, the Company
also had uncommitted short-term credit lines of $170.0 million, of which $159.9
million was unused.  During 1997, notes payable increased $38.8 million, after
the application of $40.0 million proceeds from the issuance of long-term debt to
reduce notes payable, compared with an increase of $62.7 million during 1996 and
a decrease of $38.5 million in 1995.  The decrease in fiscal 1995 was primarily
due to repayment of short-term debt with most of the proceeds from the issuance
of $67.0 million of long-term debt.

     Long-term financing activities. In November 1996, the Company issued $40.0
million of 6.09% unsecured notes due in November 1998 to a bank. The proceeds
were used to refinance short-term debt. Long-term debt payments totaled $14.7
million, $20.7 million, and $10.3 million for the years ended September 30,
1997, 1996 and 1995, respectively. The amount for 1997 excludes repayments of
$1.4 million by UCGC in the quarter ended December 31, 1996. Payments of long-
term debt in 1997 consisted of $9.0 million of installments on the Company's
various unsecured Senior Notes, a $2.0 million installment on the 8.69% Series N
First Mortgage Bonds, and installments on various term notes and other long-term
obligations totaling $3.7 million. Payments of long-term debt in 1996 and 1995
likewise consisted of annual installments under the various loan documents. No
long-term debt was issued in 1996. In the first quarter of 1995, the Company
entered into note purchase agreements totaling $40.0 million with two insurance
companies and issued $20.0 million of unsecured Senior Notes at 8.07% payable in
annual installments of $4.0 million beginning October 31, 2002 through October
31, 2006 with semiannual interest payments and $20.0 million of unsecured Senior
Notes at 8.26% payable in annual installments of $1,818,182 beginning October
31, 2004 through October 31, 2014 with semiannual interest payments. In 1995
UCGC issued $22.0 million of medium-term notes under a shelf registration
statement and a $5.0 million term note for its propane company. The $27.0
million proceeds of these notes were used by UCGC to repay short-term
borrowings, retire long-term debt, finance the Company's construction program
and for other corporate purposes.

                                       33
<PAGE>
 
          The loan agreements pursuant to which the Company's Senior Notes and
First Mortgage Bonds have been issued contain covenants by the Company with
respect to the maintenance of certain debt-to-equity ratios and cash flows, and
restrictions on the payment of dividends.  Also see Note 7 of the accompanying
notes to consolidated financial statements.

          UCG Energy and Woodward Marketing, Inc. ("WMI"), sole shareholders of
WMLLC, act as guarantors of a $12,500,000 credit facility for WMLLC with a bank.
No balance was outstanding on this credit facility at September 30, 1997.  UCG
Energy and WMI also act as joint and several guarantors on certain purchases of
natural gas and transportation services from suppliers by WMLLC. These
outstanding obligations amounted to $12.2 million at September 30, 1997.

          Issuance of common stock.  The Company issued 400,578, 995,467 and
2,335,785 shares of common stock in 1997, 1996 and 1995, respectively, for its
Direct Stock Purchase Plan, Employee Stock Ownership Plans, Restricted Stock
Grant Plan, Outside Directors Stock-for-Fee Plan, a public offering in 1995,
acquisitions of Oceana Heights and Monarch Gas Company and an interest in
Woodward Marketing LLC.  See the Consolidated Statements of Shareholders' Equity
for the number of shares issued under each of the plans and for other
transactions. Please see Note 9 of the accompanying notes to consolidated
financial statements for the number of shares registered and available for
future issuance under each of the Company's plans.

          In November 1995 the Company exchanged 313,411 shares of its common
stock valued at approximately $6.4 million in exchange for privately held Oceana
Heights Gas Company of Thibodaux, Louisiana.

          In June 1996, in connection with the acquisition of Monarch Gas
Company ("Monarch"), 207,366 shares of UCGC's common stock were exchanged for
the common stock of Monarch.  The merger added approximately 2,900 natural gas
customers in the Vandalia, Illinois area.  In May 1995, 320,512 shares of UCGC's
common stock valued at $5,000,000 were issued in connection with the purchase of
a 45% interest in Woodward Marketing, LLC ("WMLLC") by UCG Energy.  In June 1995
UCGC issued 1,380,000 shares of common stock under a shelf registration
statement in an underwritten public offering with net proceeds from the sale
amounting to approximately $18.9 million.

     The Company believes that internally generated funds, its credit facilities
and access to the public debt and equity capital markets will provide necessary
working capital and liquidity for capital expenditures and other cash needs for
1998.

                                       34
<PAGE>
 
Inflation

     The Company believes that inflation has caused and will continue to cause
increases in certain operating expenses and has required and will continue to
require assets to be replaced at higher costs.  The Company continually reviews
the adequacy of its gas rates in relation to the increasing cost of providing
service and the inherent regulatory lag in adjusting those gas rates.

                                       35
<PAGE>
 
ITEM 8.   FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA


                                                         Page no.

Reports of independent auditors                              37

Consolidated balance sheets                                  39

Consolidated statements of income                            40

Consolidated statements of shareholders' equity              41

Consolidated statements of cash flows                        43

Notes to consolidated financial statements                   45

Supplementary data (unaudited)                               74

                                       36
<PAGE>
 
REPORT OF ERNST & YOUNG LLP,
INDEPENDENT AUDITORS

Board of Directors
Atmos Energy Corporation

     We have audited the accompanying consolidated balance sheets of Atmos
Energy Corporation at September 30, 1997 and 1996, and the related consolidated
statements of income, shareholders' equity and cash flows for each of the three
years in the period ended September 30, 1997.  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 did
not audit the financial statements of United Cities Gas Company, wholly owned by
Atmos Energy Corporation (see Note 2), which statements reflect total assets of
$513,649,000 as of December 31, 1996 and total revenues of $402,947,000 and
$313,735,000 for the years ended December 31, 1996 and 1995. Those statements
were audited by other auditors whose report has been furnished to us and our
opinion, insofar as it relates to data included for United Cities Gas Company is
based solely on the report of the other auditors.

         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 and the report of other auditors provide a reasonable
basis for our opinion.

     In our opinion, based on our audits and the report of other auditors, the
financial statements referred to above present fairly, in all material respects,
the consolidated financial position of Atmos Energy Corporation at September 30,
1997 and 1996, and its consolidated results of operations and its cash flows for
each of the three years in the period ended September 30, 1997 in conformity
with generally accepted accounting principles.

 

                                              Ernst & Young LLP

Dallas, Texas
November 11, 1997

                                       37
<PAGE>
 
REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

To United Cities Gas Company:

          We have audited the accompanying consolidated balance sheet and
consolidated statements of capitalization of United Cities Gas Company (an
Illinois corporation) and subsidiaries as of December 31, 1996, and the related
consolidated statements of income, retained earnings, capital surplus and common
stock and cash flows for each of the two 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 consolidated financial statements referred to
above present fairly, in all material respects, the financial position of United
Cities Gas Company and subsidiaries as of December 31, 1996, and the results of
their operations and their cash flows for each of the two years in the period
ended December 31, 1996 in conformity with generally accepted accounting
principles.



                                    Arthur Andersen LLP

Nashville, Tennessee
February 14, 1997

                                       38
<PAGE>
 
ATMOS ENERGY CORPORATION
CONSOLIDATED BALANCE SHEETS     

<TABLE> 
<CAPTION> 

                                                                            September 30,
                                                                          1997        1996
                                                                       ----------  ----------
ASSETS                                                           (In thousands, except share data)
<S>                                                                    <C>         <C>
Property, plant and equipment                                          $1,301,004  $1,198,557
Construction in progress                                                   31,668      21,217
                                                                       ----------  ----------
                                                                        1,332,672   1,219,774
Less accumulated depreciation and amort.                                  483,545     449,563
                                                                       ----------  ----------
  Net property, plant and equipment                                       849,127     770,211
Current assets
 Cash and cash equivalents                                                  6,016      11,134
 Accounts receivable, less allowance for doubtful accounts 
  of $2,188 in 1997 and $2,462 in 1996                                     71,217     103,415
 Inventories                                                               12,333      13,895
 Gas stored underground                                                    48,122      43,350
 Prepayments                                                                6,017       2,809
                                                                       ----------  ----------
   Total current assets                                                   143,705     174,603
Deferred charges and other assets                                          95,479      65,796
                                                                       ----------  ----------
                                                                       $1,088,311  $1,010,610
                                                                       ==========  ==========
CAPITALIZATION AND LIABILITIES                                         
Shareholders' equity
 Common stock, no par value (stated at $.005 per share); 
  authorized 75,000,000 shares; issued and outstanding 
  1997 - 29,642,437 shares, 1996 - 29,241,859 shares                   $      148  $      146
 Additional paid-in capital                                               251,174     241,658
 Retained earnings                                                         75,938      87,778
                                                                       ----------  ----------
  Total shareholders' equity                                              327,260     329,582
Long-term debt                                                            302,981     276,162
                                                                       ----------  ----------
  Total capitalization                                                    630,241     605,744
Current liabilities
 Current maturities of long-term debt                                      15,201      16,679
 Notes payable to banks                                                   167,300     128,488
 Accounts payable                                                          62,626      80,321
 Taxes payable                                                                416      11,201
 Customers' deposits                                                       15,098      16,812
 Other current liabilities                                                 52,582      23,866
                                                                       ----------  ----------
  Total current liabilities                                               313,223     277,367
Deferred income taxes                                                      87,828      72,073
Deferred credits and other liabilities                                     57,019      55,426
                                                                       ----------  ----------
                                                                       $1,088,311  $1,010,610
                                                                       ==========  ==========
</TABLE>
See accompanying notes to consolidated financial statements.

                                       39
<PAGE>
 
ATMOS ENERGY CORPORATION
CONSOLIDATED STATEMENTS OF INCOME
<TABLE>
<CAPTION>
 
                                                      Year ended September 30,
                                                ---------------------------------
                                                   1997         1996       1995
                                                -----------  ----------  --------
<S>                                              <C>          <C>        <C>
                                               (In thousands, except per share data)
                                         
Operating revenues                                $906,835    $886,691   $749,555
Purchased gas cost                                 577,181     562,279    449,397
                                                  --------    --------   --------
Gross profit                                       329,654     324,412    300,158
                                         
Operating expenses                       
 Operation                                         173,683     148,196    146,624
 Maintenance                                        11,974      11,719     11,350
 Depreciation and amortization                      45,257      41,666     40,597
 Taxes, other than income                           32,131      30,254     29,626
 Income taxes                                       14,298      23,316     16,544
                                                  --------    --------   --------
  Total operating expenses                         277,343     255,151    244,741
                                                  --------    --------   --------
                                         
Operating income                                    52,311      69,261     55,417
Other income (expense)                   
 Interest and                            
  investment income                                  5,410       3,867      3,290
 Other, net                                           (288)       (300)       287
                                                  --------    --------   --------
  Total other income                     
    (expense)                                        5,122       3,567      3,577
                                         
Interest charges                                    33,595      31,677     30,186
                                                  --------    --------   --------
                                         
Net income                                        $ 23,838    $ 41,151   $ 28,808
                                                  ========    ========   ========
Net income per share                                  $.81       $1.42      $1.06
                                                  ========    ========   ========
Cash dividends per share                             $1.01        $.98       $.96
                                                  ========    ========   ========
Average shares outstanding                          29,409      28,978     27,208
                                                  ========    ========   ========
</TABLE>


         See accompanying notes to consolidated financial statements.

                                       40
<PAGE>
 
ATMOS ENERGY CORPORATION
CONSOLIDATED STATEMENTS OF
SHAREHOLDERS' EQUITY

<TABLE> 
<CAPTION> 
                                               Common stock
                                           -------------------  Additional
                                           Number of    Stated   paid-in  Retained
                                             shares     value    capital  earnings
                                           ----------  -------  --------  --------
                                              (In thousands, except share data)
<S>                                        <C>            <C>   <C>       <C>  
Balance, September 30, 1994                25,910,607     $130  $196,487  $ 70,967
 Net income                                         -        -         -    28,808
 Cash dividends ($.96 per share)                    -        -         -   (26,197)
 Common stock issued:
  Restricted stock grant plan                  13,000        -       202         -
  Direct stock purchase plans                 388,484        2     5,832         -
  ESOP/401(k) plans                           233,789        1     4,173         -
  Woodward Marketing acq.                     320,512        2     4,998         -
  Public offering                           1,380,000        6    18,893         -
 Other                                              -        -        45         -
                                           ----------     ----  --------  --------
Balance, September 30, 1995                28,246,392      141   230,630    73,578
 Net income                                         -        -         -    41,151
 Cash dividends ($.98 per share)                    -        -         -   (28,478)
 Common stock issued:
  Restricted stock grant plan                  41,700        1       733         -
  Direct stock purchase plans                 268,124        1     4,563         -
  Outside directors stock-for-fee plan          3,389        -        76         -
  ESOP                                        161,477        1     3,641         -
  Monarch Gas Co acq.                         207,366        1     1,499       933
  Oceana Heights acq.                         313,411        1       304       594
 Other                                              -        -       212         -
                                           ----------     ----  --------  --------
Balance, September 30, 1996                29,241,859      146   241,658    87,778
</TABLE>



                                  (continued)

                                       41
<PAGE>
 
ATMOS ENERGY CORPORATION
CONSOLIDATED STATEMENTS OF
SHAREHOLDERS' EQUITY

 (continued)

<TABLE> 
<CAPTION> 
                                               Common stock
                                           -------------------  Additional
                                           Number of    Stated   paid-in  Retained
                                             shares     value    capital  earnings
                                           ----------  -------  --------  --------
                                              (In thousands, except share data)
<S>                                       <C>            <C>   <C>       <C>  
Balance, September 30, 1996               29,241,859     $146  $241,658  $ 87,778
 Net income                                        -        -         -    23,838
 Cash dividends ($1.01 per share)                  -        -         -   (26,415)
 Common stock issued:
  Restricted stock grant plan                100,000        1     2,443         -
  Direct stock purchase plans                 85,243        -     1,888         -
  Outside directors stock-for-fee plan         3,008        -        72         -
  ESOP/401(k) plans                          212,327        1     5,113         -
 Less: UCGC net income for the quarter 
  ended December 31, 1996                          -        -         -    (9,263)
                                          ----------  -------  --------  --------
Balance, September 30, 1997               29,642,437     $148  $251,174  $ 75,938
                                          ==========  =======  ========  ========
</TABLE>



         See accompanying notes to consolidated financial statements.

                                       42
<PAGE>
 
ATMOS ENERGY CORPORATION
CONSOLIDATED STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
 
                                                              Year ended September 30,
                                                         --------------------------------
                                                           1997       1996        1995
                                                         --------  ----------  ----------
<S>                                                    <C>         <C>         <C>
                                                                (In thousands)
CASH FLOWS FROM OPERATING ACTIVITIES
Net income                                             $  14,575   $  41,151   $  28,808
Adjustments to reconcile net income to net cash 
 provided by operating activities:
  Depreciation and amortization:
   Charged to depreciation and amortization               39,970      41,666      40,597
   Charged to other accounts                               2,237       3,580       3,601
  Deferred income taxes                                    5,807       7,585       4,652
  Other                                                        -      (1,866)        293
  Change in assets and liabilities:
   (Increase) decrease in accounts receivable             32,198     (12,697)     (9,199)
   (Increase) decrease in inventories                      1,562      (1,238)       (827)
   (Increase) decrease in gas stored underground          (4,772)    (15,949)     11,707
   (Increase) decrease in prepayments                     (3,208)      1,966        (419)
   Increase in deferred charges and other assets         (29,683)     (4,623)    (10,832)
   Increase (decrease) in accounts payable               (17,695)     23,796       3,415
   Increase (decrease) in taxes payable                     (837)      7,099         162
   Increase (decrease) in customers' deposits             (1,714)        592       1,235
   Increase (decrease) in other current liabilities       28,716      (4,165)      5,096
   Increase in deferred credits and other liabilities      1,593       4,836         854
                                                       ---------   ---------   ---------
  Net cash provided by operating activities               68,749      91,733      79,143
 
CASH FLOWS FROM INVESTING ACTIVITIES
 Capital expenditures                                   (122,312)   (117,589)   (103,904)
 Retirements of property, plant and equipment              1,189       5,708       2,456
                                                       ---------   ---------   ---------
  Net cash used in investing activities                 (121,123)   (111,881)   (101,448)
</TABLE>

                                 - Continued -

                                       43
<PAGE>
 
ATMOS ENERGY CORPORATION
CONSOLIDATED STATEMENTS OF CASH FLOWS (continued)

<TABLE>
<CAPTION>
                                                              Year ended September 30,
                                                         --------------------------------
                                                           1997       1996        1995
                                                         --------  ----------  ----------
<S>                                                    <C>         <C>         <C>
                                                                (In thousands)
CASH FLOWS FROM FINANCING ACTIVITIES
 Net increase (decrease) in notes payable               $ 38,812   $ 62,675   $(38,475)
 Proceeds from issuance of long-term debt                 40,000          -     67,000
 Repayment of long-term debt                             (14,659)   (20,734)   (10,347)
 Cash dividends paid                                     (26,415)   (28,478)   (26,197)
 Issuance of common stock                                  9,518      8,523     34,109
                                                        --------   --------   --------
  Net cash provided by financing activities               47,256     21,986     26,090
                                                        --------   --------   --------
Net increase (decrease) in cash and cash equivalents      (5,118)     1,838      3,785
Cash and cash equivalents at beginning of year            11,134      9,296      5,511
                                                        --------   --------   --------
Cash and cash equivalents at end of year                $  6,016   $ 11,134   $  9,296
                                                        ========   ========   ========
</TABLE>



         See accompanying notes to consolidated financial statements.

                                       44
<PAGE>
 
ATMOS ENERGY CORPORATION
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


Contents of Notes to Consolidated Financial Statements

 1.         Summary of significant accounting policies              45
                                                             
 2.         Business combinations                                   48
                                                             
 3.         Rates                                                   50
                                                             
 4.         Income taxes                                            52
                                                             
 5.         Contingencies                                           54
                                                             
 6.         Leases                                                  59
                                                             
 7.         Long-term debt and notes payable                        60
                                                             
 8.         Statement of cash flows supplemental disclosures        62
                                                             
 9.         Common stock and stock options                          62
                                                             
10.         Employee retirement and stock ownership plans           64
                                                             
11.         Other postretirement benefits                           69
 
Supplementary Data - Quarterly Financial Data (Unaudited)           74

1.  Summary of significant accounting policies

          Description of business - Atmos Energy Corporation and its
subsidiaries ("Atmos" or the "Company") are in the business of distributing
natural gas to residential, commercial, industrial and agricultural customers
within service areas located in Texas, Louisiana, Kentucky, Colorado, Kansas,
Illinois, Tennessee, Iowa, Virginia, Georgia, South Carolina and Missouri.  Such
business is subject to federal and state regulation and/or regulation by local
authorities in each of the twelve states in which the Company operates.  In
connection with the acquisition of United Cities Gas Company (See Note 2), the
Company also acquired non-utility businesses operated through UCG Energy
Corporation ("UCG Energy") and United Cities Gas Storage Company ("UCG
Storage"). They are involved in propane sales and distribution, gas marketing,
rental of real estate, equipment and appliances,  and natural gas storage
services.  None of the non-utility operations constitute a material business
segment.

          Principles of consolidation - The accompanying consolidated financial
statements include the accounts of Atmos Energy Corporation and its
subsidiaries.  Each subsidiary is wholly-

                                       45
<PAGE>
 
owned and all material intercompany items have been eliminated. Investments in
50%-or-less owned joint ventures or partnerships are accounted for by the equity
method or the cost method, as appropriate.

          Restatement for pooling of interests - The consolidated financial
statements for all prior periods presented have been restated for the pooling of
interests of the Company with United Cities Gas Company in July 1997.  Certain
changes in account classifications have been made to conform United Cities Gas
Company's classifications to Atmos' presentation.

          Regulation - The Company's utility operations are subject to
regulation with respect to rates, service, maintenance of accounting records and
various other matters by the respective regulatory authorities in the states in
which it operates.  The consolidated financial statements are based on generally
accepted accounting principles.  Atmos' accounting policies recognize the
financial effects of the ratemaking and accounting practices and policies of the
various regulatory commissions.

          Revenue recognition -  Sales of natural gas are billed on a monthly
cycle basis; however, the billing cycle periods for certain classes of customers
do not necessarily coincide with ac  counting periods used for financial
reporting purposes.  The Company follows the revenue accrual method of
accounting for natural gas revenues whereby revenues applicable to gas delivered
to customers but not yet billed under the cycle billing method are estimated and
accrued and the related costs are charged to expense. Estimated losses due to
credit risk are reserved at the time revenue is recognized.

          Property, plant and equipment - Property, plant and equipment is
stated at original cost net of contributions in aid of construction.  The cost
of additions includes an allowance for funds used during construction and
applicable overhead charges. Major renewals and betterments are capitalized,
while the costs of maintenance and repairs are charged to expense as incurred.
Property, plant and equipment is depreciated at various rates on a straight-line
basis over the estimated useful lives of the assets.  The composite rates were
3.9% and 3.7% for the years ended September 30, 1997 and 1996, respectively.  At
the time property, plant and equipment is retired, the cost, plus removal
expenses and less salvage, is charged to accumulated depreciation.

          Inventories - Inventories consist of materials and supplies and
merchandise held for resale.  Inventories are stated at the lower of average
cost or market.

          Gas stored underground - Net additions of inventory gas to underground
storage and withdrawals of inventory gas from storage are priced using the
average cost method for Atmos, except for the United Cities Division, where it
is priced on the first-in first-out method.  Propane is priced at average cost.
Gas stored

                                       46
<PAGE>
underground and owned by UCG Storage is priced on the last-in first-out ("LIFO")
method. In accordance with the United Cities Division's PGA clause, the
liquidation of a LIFO layer would be reflected in subsequent gas adjustments in
customer rates and does not affect the results of operations. Non-current gas in
storage is classified as property, plant and equipment and is priced at cost.

          Income taxes - The Company provides deferred income taxes for
significant temporary differences in the recognition of revenues and expenses
for tax and financial reporting purposes.

          Cash and cash equivalents - The Company considers all highly liquid
debt instruments purchased with a maturity of three months or less to be cash
equivalents.

          Deferred charges and other assets - Deferred charges and other assets
at September 30, 1997 and 1996 include assets of the Company's qualified defined
benefit retirement plans in excess of the plans' obligations in the amounts of
$11,557,000 and $11,810,000, respectively, and Company assets related to the
nonqualified retirement plans at September 30, 1997 and 1996 of $21,210,000 and
$17,808,000, respectively.

          Deferred credits and other liabilities - Deferred credits and other
liabilities include customer advances for construction of $10,072,000 and
$9,753,000 at September 30, 1997 and 1996, respectively; obligations under
capital leases of $3,047,000 and $2,769,000 at September 30, 1997 and 1996,
respectively; and obligations under the Company's nonqualified retirement plans
of $22,167,000 and $20,313,000 at September 30, 1997 and 1996, respectively.

          Earnings per share - The calculation of primary earnings per share is
based on reported net income divided by weighted average common shares
outstanding.  The Company does not have other classes of stock or dilutive
common stock equivalents.

          Use of estimates - The preparation of financial statements in
conformity with generally accepted accounting principles 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 revenues and expenses during the reporting period.
Actual results could differ from those estimates.

Recently Issued Accounting Standards Not Yet Adopted

          The Company has not yet adopted Statement of Financial Accounting
Standards No. 128 "Earnings per Share."  The Statement is effective for Atmos'
fiscal year 1998 and earlier adoption is not permitted.  The Statement requires
restatement of all prior-period EPS data presented.

          The Company has not yet adopted Statement of Financial Accounting
Standards No. 130 "Reporting Comprehensive Income." The Statement will be
effective for Atmos' fiscal year 1999.  It establishes standards for reporting
and display of comprehensive income and its components (revenues, expenses,
gains, and losses) in a full set of general-purpose financial statements.
Reclassification of financial statements for earlier periods provided for
comparative purposes is required.

                                       47
<PAGE>
 
          The Company has not yet adopted Statement of Financial Accounting
Standards No. 131 "Disclosures about Segments of an Enterprise and Related
Information."  The Statement will be effective for Atmos' fiscal year 1999.  It
establishes standards for the way that public business enterprises report
information about operating segments in annual financial statements and requires
that those enterprises report selected information about operating segments in
interim financial reports issued to shareholders.  In the initial year of
application, comparative information for earlier years is to be restated.

          The Company believes that adoption of these Statements will not have a
material impact on its financial condition, results of operations, or cash
flows.

2.   Business combinations

          On July 31, 1997 Atmos acquired by means of a merger all of the assets
and liabilities of United Cities Gas Company ("UCGC") in accordance with the
terms and provisions of an Agreement and Plan of Reorganization dated July 19,
1996 and amended October 3, 1996.  A total of 13,320,221 shares of Atmos common
stock were issued in a one-for-one exchange for all outstanding shares of UCGC
common stock.  UCGC was a natural gas utility company engaged in the
distribution and sale of natural gas to approximately 306,000 customers in
Georgia, Illinois, Iowa, Kansas, Missouri, South Carolina, Tennessee, and
Virginia, and in the sale of propane to approximately 29,000 customers in
Kentucky, North Carolina, Tennessee, and Virginia.  Its assets consisted of the
property, plant and equipment used in its natural gas and propane sales and
distribution businesses.  With the completion of the merger, Atmos serves over
1,000,000 customers in 13 states.

          UCGC was merged with and into Atmos by means of a tax-free
reorganization.  The transaction was accounted for as a pooling of interests;
therefore, all historical financial statements and notes thereto have been
restated.  UCGC prepared its financial statements on a December 31 fiscal year
end.  UCGC's fiscal year has been changed to September 30 to conform to the
Company's year end.  The restated September 30, 1996 balance sheet, as
presented, is the combined balance sheets of Atmos as of September 30, 1996 and
UCGC as of December 31, 1996.  The restated consolidated statements of income
and cash flows for the years ended September 30, 1996 and 1995 include Atmos
operations for the years then ended and UCGC operations for the years ended
December 31, 1996 and 1995.  The consolidated statement of income for the year
ended September 30, 1997 includes Atmos and UCGC operations for the twelve
months then ended.  As a result, UCGC's operations for the three months ended
December 31, 1996 (operating revenues of $122,971,000 and net income of
$9,263,000) are included in both the 1997 and 1996 consolidated statements of
income, the UCGC net income for this period has been deducted in calculating the
shareholders' equity balances at September 30, 1997 and cash flows for the year
then ended.  Certain account

                                       48
<PAGE>
 
reclassifications were made to conform UCGC's classifications to Atmos'
presentation.

          Following the merger, UCGC's business has been operated as United
Cities Gas Company, a division of Atmos ("United Cities Division") and
integration of the companies has begun.  The United Cities Division will be
structured like other divisions of Atmos. To achieve this structure,
approximately 560 utility positions in the United Cities Division will be
eliminated by September 1998.  An additional 75 Atmos positions will be
eliminated as part of the integration, resulting in approximately 635 total
position reductions in the combined company by September 1998.  Atmos also has
initiated plans to enhance its customer service in Texas, Louisiana, Kentucky,
Colorado, Kansas and Missouri through business process changes which will result
in a net reduction of approximately 240 positions.  These changes include
restructuring business office operations, establishing a network of payment
centers and creating a customer support call center.

          Atmos estimates the cost of the merger and integration will total
approximately $17,000,000 for the transaction costs and $32,000,000 for the
separation and other costs.  The Company believes there are substantial longer
term benefits to its customers and shareholders from the merger of the two
companies, which are expected to result in operating cost savings over the next
10 years totaling approximately $375,000,000.  The Company believes a
significant amount of the costs to achieve these benefits will be recovered
through rates and future operating efficiencies of the combined operations.

          The Company recorded as regulatory assets the costs of the merger and
integration of the United Cities Division as discussed above, along with the
costs of the customer service initiative, which are primarily separation costs
and are estimated to be approximately $12,000,000 through September 30, 1997.
However, the Company established a general reserve of approximately $20,340,000
($12,630,000 after-tax), to account for costs that may not be recovered through
rates. Since the substantial portion of the costs are related to position
eliminations between July 31, 1997 and July 31, 1998 and fees payable at the
close of the merger, the Company recorded these costs in the fourth quarter of
fiscal year 1997 when the merger was completed, separation plans were approved
by the Board of Directors, and announcements were made to employees.

                                       49
<PAGE>
 
          Results of operations and net income for the previously separate
companies for the periods prior to the merger are as follows:

<TABLE>
<CAPTION>
 
                       10 Months ended            Year ended
                           July 31,              September 30,
                             1997             1996         1995
                       ----------------  --------------  --------
                         (Unaudited)     (In thousands)
<S>                    <C>               <C>             <C>
Operating revenues:
  Atmos                       $474,069        $483,744   $435,820
  UCGC                         356,325         402,947    313,735
                              --------        --------   --------
                              $830,394        $886,691   $749,555
                              ========        ========   ========
Net income:
  Atmos                       $ 23,079        $ 23,949   $ 18,873
  UCGC                          19,434          17,202      9,935
                              --------        --------   --------
                              $ 42,513        $ 41,151   $ 28,808
                              ========        ========   ========
Dividends per share:
 Atmos                        $    .75        $    .96   $    .92
 UCGC                         $    .76        $   1.02   $   1.02
</TABLE>

3. Rates
 
          As of September 30, 1997, the Company did not have any rate cases
currently pending except for a "show cause" hearing scheduled to review rates in
Colorado before the Colorado Public Utility Commission in December 1997.  Rate
cases completed during the three years ended September 30, 1997 are summarized
below.

          In November 1996, UCGC filed to increase rates on an annual basis by
$1,234,000 to approximately 23,000 customers in the state of Illinois.
Effective July 9, 1997, the Illinois Commerce Commission granted a rate increase
of $428,000 in annual revenues.  The increase will be followed by a rate
moratorium until June 2000.  Effective December 2, 1996, UCGC received an annual
rate increase of $3,160,000 for approximately 70,000 customers in the state of
Georgia.  UCGC had filed in May 1996 to increase rates by $5,003,000 on an
annual basis.  Effective May 17, 1996, UCGC received an annual rate increase of
$410,000 in the state of Iowa.  UCGC had filed to increase rates by $750,000 on
an annual basis.  Included in the rate increase in Iowa was the recovery of
$1,787,000 over a ten-year period related to UCGC's agreement with Union
Electric Company ("Union Electric") whereby Union Electric agreed to assume
responsibility for UCGC's continuing investigation and environmental response
action obligations as outlined in the feasibility study pertaining to a
manufactured gas plant site in Keokuk, Iowa.

          Effective November 15, 1995, UCGC received an annual rate increase of
$2,227,000 in the state of Tennessee.  UCGC had filed

                                       50
<PAGE>
 
to increase rates by $3,951,000 on an annual basis.  Effective October 14, 1995,
UCGC received an annual rate increase of $903,000 in the state of Missouri.
UCGC had filed to increase rates by $1,100,000 on an annual basis.  Effective
September 1, 1995, UCGC received an annual rate increase of $2,700,000 in the
state of Kansas.  UCGC had filed to increase rates by $4,230,000 on an annual
basis. Effective February 7, 1995, UCGC received an annual rate increase of
$253,000 in the state of South Carolina. UCGC had filed to increase rates by
$341,000 on an annual basis.

          The Georgia Public Service Commission and the Tennessee Regulatory
Authority have approved Weather Normalization Adjustments ("WNAs").  The WNAs,
effective October through May each year in Georgia and November through April
each year in Tennessee, allow the United Cities Division to increase the base
rate portion of customers' bills when weather is warmer than normal and decrease
the base rate when weather is colder than normal.  The net effect of the WNAs
was an increase/(decrease) in revenues of $2,643,000, ($2,612,000) and
$1,030,000 in 1997, 1996 and 1995, respectively.

          In April 1995, UCGC filed to increase rates on an annual basis by
$810,000 to approximately 18,000 customers in the state of Virginia.  UCGC was
granted permission by the Virginia State Corporation Commission ("Virginia
Commission") to implement the proposed 3% rate increase, subject to refund,
effective September 29, 1995.  In May 1997, the Virginia Commission issued an
order approving a rate increase of .4%, effective September 29, 1995, which is
expected to generate additional annual revenues of $103,000.  Money over-
collected from customers under the interim rates was credited to customer
accounts with interest.

          Effective April 1, 1995, and for an experimental two-year period, the
PGA clause in Tennessee was modified by an incentive rate program which compares
UCGC purchased gas prices to market prices.  The gains or losses recognized by
UCGC as a result of the incentive program were limited to a maximum of $25,000
per month in the plan year ended March 31, 1996, and limited to a maximum of
$600,000 per year in the plan year ended March 31, 1997.  UCGC recognized gains
related to the incentive programs in Tennessee of $675,000 and $213,000 for
fiscal 1996 and 1995, respectively.  On March 5, 1997, the Tennessee Court of
Appeals (the "Court") issued a decision reversing and remanding the Tennessee
Regulatory Authority's order which approved the incentive rate program for the
plan year ending March 31, 1997. UCGC has filed to make the program permanent,
effective April 1, 1997 and a hearing has not been held as of this date.  An
experimental incentive rate program similar to the Tennessee program has also
been approved in Georgia for a two-year period that began April 1, 1997.

          In May 1996, the Company filed to increase revenues by approximately
$7.7 million for a portion of its Energas Division service area, which includes
approximately 200,000 customers inside the city limits of 67 cities in West
Texas.  All cities

                                       51
<PAGE>
 
either approved, or took no action to reject, a settlement allowing a $5.3
million increase in annual revenues to be effective for bills rendered on or
after November 1, 1996.  In October 1996, the Company filed a rate request with
the Railroad Commission of Texas to increase revenues by approximately $.5
million for the remaining 22,000 rural customers in West Texas. The rate request
was approved and became effective in April 1997.

          In February 1995, the Company filed with the Kentucky Public Service
Commission (the "Kentucky Commission") for a rate increase for its Western
Kentucky Division, which includes approximately 171,000 customers.  In October
1995, the Kentucky Commission issued an order authorizing the Company to
increase its rates by $2.3 million annually effective November 1, 1995, and by
an additional $1.0 million annually beginning in March 1996.  The settlement
included a decrease in depreciation rates, recovery of expenses related to
adoption of Statement of Financial Accounting Standards No. 106 and included a
provision for the Company to begin a three-year demand-side management pilot
program for the 1996-97 heating season, which could cost up to $450,000
annually, resulting in a total annual operating in  come increase of
approximately $4.0 million.  In fiscal 1997 the Company incurred costs of
approximately $218,000 on the demand-side management pilot program.


4. Income taxes

     The components of income tax expense for 1997, 1996 and 1995 are as
follows:

                            1997      1996      1995
                          --------  --------  --------
                                 (In thousands)
Current                   $ 8,917   $16,156   $12,319
Deferred                    5,807     7,585     4,652
Investment tax credits       (426)     (425)     (427)
                          -------   -------   -------
                          $14,298   $23,316   $16,544
                          =======   =======   =======

          Included in the provision for income taxes are state income taxes of
$2,000,000, $2,801,000, and $1,552,000 for 1997, 1996, and 1995, respectively.

          Deferred income taxes reflect the tax effect of differences between
the basis of assets and liabilities for book and tax purposes.  The tax effect
of temporary differences that give rise to significant components of the
deferred tax liabilities and deferred tax assets at September 30, 1997 and 1996
are presented below:

                                       52
<PAGE>
 
<TABLE>
<CAPTION> 
                                                           1997         1996
                                                         --------     --------
<S>                                                       <C>       <C>
                                                            (In thousands)
Deferred tax assets
 Costs expensed for book purposes and capitalized for 
  tax purposes                                           $     641   $  1,087
 Accruals not currently deductible for tax purposes         12,398      3,460
 Customer advances                                           3,160      2,629
 Nonqualified benefit plans                                  9,118      8,238
 Postretirement benefits                                     5,757      3,819
 Unamortized investment tax credit                           1,723      1,593
 Regulatory liabilities                                      3,117      3,035
 Other, net                                                  3,758      1,776
                                                         ---------   --------
   Total deferred tax assets                                39,672     25,637
 
Deferred tax liabilities
 Difference in net book value and net tax value 
  of assets                                               (102,038)   (87,604)
 Pension funding                                            (4,190)    (4,734)
 Gas cost adjustment                                        (6,568)      (655)
 Regulatory assets                                          (8,673)    (1,529)
 Other, net                                                 (6,031)    (3,188)
                                                         ---------   --------
   Total deferred tax liabilities                         (127,500)   (97,710)
                                                         ---------   --------
Net deferred tax liabilities                             $ (87,828)  $(72,073)
                                                         =========   ========
SFAS No. 109 deferred accounts for rate regulated 
 entities (included in other deferred credits)           $  15,072   $ (3,904)
                                                         =========   ========
</TABLE>

          Reconciliations of the provisions for income taxes computed at the
statutory rate to the reported provisions for income taxes for 1997, 1996 and
1995 are set forth below:

<TABLE>
<CAPTION>
                                                    Liability Method
                                              ----------------------------
                                               1997       1996      1995
                                              --------  --------  --------
<S>                                           <C>       <C>       <C>
(In thousands)
Tax at statutory rate of 35%                  $13,348   $22,564   $15,873
 
Common stock dividends deductible for tax 
 reporting                                       (706)     (684)     (619)
State taxes                                     1,300     2,000       951
Other, net                                        356      (564)      339
                                              -------   -------   -------
Provision for income taxes                    $14,298   $23,316   $16,544
                                              =======   =======   =======
</TABLE>

                                       53
<PAGE>
 
5.  Contingencies

Litigation

          On March 15, 1991, suit was filed in the 15th Judicial District Court
of Lafayette Parish, Louisiana, by the "Lafayette Daily Advertiser" and others
against Trans Louisiana Gas Company ("Trans La Division"), Trans Louisiana
Industrial Gas Company, Inc. ("TLIG"), a wholly owned subsidiary of the Company,
and Louisiana Intrastate Gas Corporation and certain of its affiliates ("LIG").
LIG is the Company's primary supplier of natural gas in Louisiana and is not
otherwise affiliated with the Company.

          The plaintiffs purported to represent a class consisting of all
residential and commercial gas customers in the Trans La Division's service
area.  Among other things, the lawsuit alleged that the defendants violated
antitrust laws of the state of Louisiana by manipulating the cost-of-gas
component of the Trans La Division's gas rate to the purported customer class,
thereby causing such purported class members to pay a higher rate.  The
plaintiffs made no specific allegation of an amount of damages.

          On July 14, 1995, the Louisiana Commission entered an order approving
a settlement with the Company and TLIG in connection with its investigation of
the costs included in the Trans La Division's purchased gas adjustment component
in its rates.  The order exonerated the Company of any wrongdoing with respect
to the manipulation of the cost of gas component of its gas rate to residential
and commercial customers.  In the settlement, the Company agreed to refund
approximately $541,000 plus interest to the Trans La Division's customers over a
two-year period due to certain issues related to the calculation of the weighted
average cost of gas.  The refund totaling approximately $1,016,000, which
includes interest calculated through October 1, 1995, began in September 1995
and was credited to customer bills along with interest that accrued after
October 1, 1995.  The Company completed the refunds, refunding $533,000 under
the settlement for the twelve months ended September 30, 1997.  Most of the
issues that generated the refunds arose before Trans Louisiana Gas Company was
acquired by the Company in 1986.

          On April 18, 1997, the Louisiana Commission entered its Order
approving a settlement between LIG and the Louisiana Commission pursuant to
which LIG will make a payment of $10,275,000 to the Trans La Division for the
benefit of its ratepayers.  This settlement resolves all remaining issues in the
Louisiana proceeding discussed above.  Pursuant to the Order, the Trans La
Division has been ordered to flow through a total of $9,725,000 of the LIG
settlement, plus accrued interest, to its customers in the form of credits to
customers' bills for the months November 1997 through March 1998.  The remaining
$550,000 will be credited one half to TLIG with the other half credited to the
Trans La Division for legal fees.  The Order became final on June 2, 1997 when
no appeals had been filed during the appeal period which ended June 1, 1997.

                                       54
<PAGE>
 
          As a result of the settlements reached in the Louisiana proceedings, a
Joint Motion was filed in the Court on July 29, 1997, requesting the Court to
lift the stay of the proceedings entered by the Court on January 19, 1993 to
permit the consummation of the proposed settlement, certify a class for purposes
of settlement and to preliminarily approve the settlement between the plaintiff
class and all defendants.  On July 30, 1997, the Court entered its order lifting
the stay of the proceedings, certifying a class of current Trans La Division 
ratepayers for purposes of settlement and receipt of proceeds of settlement,
preliminarily approving the proposed settlement between the plaintiff class and
the defendants, approving the form of notice to potential class members, and
setting a fairness hearing regarding the proposed settlement and disbursement of
proceeds.  At the fairness hearing, which is set for December 15, 1997, final
approval of the settlement by the Court will be sought.  If final approval of
the Court is granted, the suit will be dismissed.

          In Colorado, Greeley Gas Company ("Greely Gas Division") is a
defendant in several lawsuits filed as a result of a fire in a building in
Steamboat Springs, Colorado on February 3, 1994. The plaintiffs claim that the
fire resulted from a leak in a severed gas service line owned by the Greeley Gas
Division. On January 12, 1996, the jury awarded the plaintiffs approximately
$2.5 million in compensatory damages and approximately $2.5 million in punitive
damages. The jury assessed the Company with liability for all of the damages
awarded. The Company has appealed the judgment to the Colorado Court of Appeals.
The Company believes it has meritorious issues for such appeal but cannot
assess, at this time, the likelihood of success in the appeal. The Company has
adequate insurance to cover the compensatory damages awarded. The Company's
insurance carrier has also recently informed the Company that any punitive
damages which may be awarded against the Company would be covered by the
Company's insurance policy.

          In March 1997, Western Kentucky Gas Company ("Western Kentucky
Division") was named as a defendant in a lawsuit in the District Court in
Danville, Kentucky, as a result of an explosion and fire at a residence in
Danville, Kentucky on March 4, 1997. The plaintiffs, Lisa Benedict, et al, who
were leasing the residence, suffered serious burns in the accident and have
alleged that the Western Kentucky Division was negligent in installing and
servicing gas lines at the residence. The plaintiffs, who are also suing the
landlord/owner of the house, have asked for punitive damages and compensatory
damages in the case. Discovery has just begun; accordingly, the Company cannot
assess, at this time, the likelihood of success in this case. However, the
Company has adequate insurance and reserves to cover any damages that may be
awarded.

          In November 1997, a jury in Plaquemine, Louisiana awarded Brian L.
Heard General Contractor, Inc. ("Heard"), a total of $177,929 in actual damages
and $15 million in punitive damages resulting from

                                       55
<PAGE>
 
a lawsuit by Heard against the Trans La Division, the successor in interest to
Oceana Heights Gas Company, which the Company acquired in November 1995. The
trial judge also awarded interest on the total judgment amount. The claims are
for events that occurred prior to the time Atmos acquired Oceana Heights Gas
Company. Heard claimed damages associated with delays he allegedly incurred in
constructing a sewer system in Iberville Parish, Louisiana. Heard filed the suit
against the Trans La Division and two other defendants, alleging that gas leaks
had caused delays in Heard's completion of a sewer project, resulting in lost
business opportunities for the contractor during 1994. The Company believes that
the gas leaks claimed in the lawsuit were minor leaks, common in normal
operations of gas systems, and were repaired in accordance with standard
industry practices and did not cause the damages claimed.

          The jury awarded punitive damages under a prior Louisiana statute that
allowed punitive damages to be awarded in cases involving hazardous substances,
which, as defined in the statute, included natural gas.  Although not
retroactive, the Louisiana legislature repealed the statute in 1996.  The
Company does not believe that punitive damages are applicable in the case and
should not be awarded because there were no direct damages caused by natural
gas. The Company plans to immediately appeal the verdict and to aggressively
pursue obtaining reversal of the judgment.  However, the Company cannot assess,
at this time, the likelihood of the judgment being reversed on appeal.  The
Company is in the process of reviewing its insurance coverage with respect to
this case.  Although Oceana Heights Gas Company was insured, it appears that a
claim of this nature will not be covered by such insurance.  However, the
Company does not expect the final outcome of this case to have a material
adverse effect on the financial condition, the results of operations or the net
cash flows of the Company.

          From time to time, other claims are made and lawsuits are filed
against the Company arising out of the ordinary business of the Company.  In the
opinion of the Company's management, liabilities, if any, arising from these
other claims and lawsuits are either covered by insurance, adequately reserved
for by the Company or would not have a material adverse effect on the financial
condition, results of operations, or cash flows of the Company.

Environmental Matters

          UCGC is the owner or previous owner of manufactured gas plant sites
which were used to supply gas prior to the availability of natural gas.
Manufactured gas was an inexpensive source of fuel for lighting and heating
nationwide.  As a result of the gas manufacturing process, certain by-products
and residual materials, including coal-tar, were produced and may have been
accumulated at the plant sites.  This was an acceptable and satisfactory process
at the time such operations were being

                                       56
<PAGE>
 
conducted.  Under current environmental protection laws and regulations, the
Company may be responsible for response actions with respect to such materials,
if response actions are necessary.

          In June 1995, UCGC entered into an agreement to pay $1,787,000 to
Union Electric whereby Union Electric agreed to assume responsibility for UCGC's
continuing investigation and environmental response action obligations as
outlined in the feasibility study related to a former manufactured gas plant
site in Keokuk, Iowa.  At September 30, 1997, the Company had $714,600 accrued
for its remaining liability related to the agreement. This amount is to be paid
in equal annual payments over each of the next two years.  UCGC deferred the
agreement amount of $1,787,000 and was granted recovery over a ten-year period
in the May 1996 Iowa rate increase.

          The United Cities Division owns or owned former manufactured gas plant
sites in Johnson City and Bristol, Tennessee, Hannibal, Missouri and Americus,
Georgia.  UCGC and the Tennessee Department of Environment and Conservation
entered into a consent order effective January 23, 1997, for the purpose of
facilitating the investigation, removal and remediation of the Johnson City
site.  UCGC began the implementation of the consent order in the first quarter
of 1997.  The Company is unaware of any information which suggests that the
Bristol site gives rise to a present health or environmental risk as a result of
the manufactured gas process or that any response action will be necessary.  The
Missouri Department of Natural Resources ("MDNR") conducted a site
reconnaissance and sampling at the Hannibal site.  In its most recent report the
MDNR concludes that hazardous substances and hazardous wastes are present on
site, and that a release of hazardous substances to soils has occurred; however,
the risk of human exposure appears to be minimal.  Additional site work is
likely.  As of September 30, 1997, the Company had incurred and deferred for
recovery $352,000, including $258,000 related to an insurance recoverability
study, and accrued and deferred for recovery an additional $750,000 associated
with the preliminary survey and invasive study of these three sites.  The
Tennessee Regulatory Authority granted UCGC permission to defer, until its next
rate case, all costs incurred in Tennessee in connection with state and
federally mandated environmental control requirements.  On May 14, 1997, the
Georgia Environmental Protection Division requested that UCGC enter into a
proposed voluntary consent order for the remediation of the Americus site.
Subsequently, the other responsible parties at the site advised UCGC that they
would be willing to enter into a "cashout" settlement for a one-time payment by
the Company of $250,000. The Company is willing to pay $250,000 for a "cashout"
settlement.  The Company has provided its comments to the proposed settlement
agreement and expects to conclude those discussions shortly.  As of September
30, 1997, the Company had accrued and deferred for recovery amounts related to
this site.

                                       57
<PAGE>
 
          Pursuant to the Tennessee Petroleum Underground Storage Tank Act, the
Company is required to upgrade or remove certain underground storage tanks
("USTs") situated in Tennessee.  As of September 30, 1997, the Company had
identified a small number of USTs in this category in Tennessee and had incurred
and deferred for recovery $98,000 and, based on available current information,
accrued and deferred for recovery an additional $70,000 for the upgrade or
removal of these USTs.  The Tennessee Regulatory Authority granted UCGC
permission to defer, until its next rate case, all costs incurred in connection
with state and federally mandated environmental control requirements.  In
addition, the Company may be able to recover a portion of any corrective action
costs from the Tennessee Underground Storage Tank Fund for certain of the UST
sites in Tennessee.

          In October 1995, UCGC received two Notices of Violation ("NOVs") from
the Tennessee Department of Environment and Conservation ("TDEC") concerning
historic releases from a UST in Kingsport, Tennessee.  This UST was formerly
owned by Holston Oil Co., Inc. ("Holston"), which at one time was a wholly-owned
subsidiary of Tennessee-Virginia Energy Corporation ("TVEC"). Prior to TVEC's
merger with UCGC in 1986, TVEC sold the common stock of Holston to an unrelated
party.  UCGC responded to the NOVs advising the TDEC that UCGC was not a
responsible party for any environmental contamination at the site.  The Company
does not anticipate incurring any response action costs at this site.

          The Kansas Department of Health and Environment ("KDHE") identified
the need to investigate gas industry activities which utilize mercury equipment
in Kansas.  The Company and KDHE have signed a Consent Order for the
investigation and possible response action for mercury contamination at any gas
pipeline site which is identified as exceeding the KDHE's established acceptable
concentration levels.  As of September 30, 1997, the Company had identified
approximately 720 meter sites where mercury may have been used and had incurred
and deferred for recovery $100,000 and, based on available current information,
accrued and deferred for recovery an additional $280,000 for the investigation
of these sites.  UCGC has received an order from the Kansas Corporation
Commission ("KCC") allowing UCGC to defer and seek recovery in future rate
proceedings the reasonable and prudent costs and expenses associated with the
Consent Order.  In the order, the Commission approved a Stipulation and
Agreement which provides a cap of $1,500,000 on amounts deferred with the
ability to exceed this cap if reasonable costs of response action are incurred.
Based on a decision by the KCC concerning the recovery of environmental response
action costs incurred by another company, the Company expects recovery of the
costs involved in the investigation and response action associated with the
mercury meter sites in Kansas.

          The Company addresses other environmental matters from time to time in
the regular and ordinary course of its business. Management expects that future
expenditures related to response action at any site will be recovered through
rates or insurance,

                                       58
<PAGE>
 
or shared among other potentially responsible parties. Therefore, the costs of
responding to these sites are not expected to materially affect the results of
operations, financial condition or cash flows of the Company.

6. Leases

          The Company has entered into noncancelable leases involving office
space and warehouse space.  The remaining lease terms range from one to 20 years
and generally provide for the payment of taxes, insurance and maintenance by the
lessee.  Net property, plant and equipment included amounts for capital leases
of $2,327,000 and $2,511,000 at September 30, 1997 and 1996, respectively.

           The related future minimum lease payments at September 30, 1997 were
as follows:

<TABLE>
<CAPTION>
                                     Capital   Operating
                                     leases     leases
                                     -------   ---------
<S>                                  <C>       <C>    
  1998                               $   699   $  9,841
  1999                                   699      9,583
  2000                                   760      9,187
  2001                                   568      8,607
  2002                                   568      8,344  
  Thereafter                           2,279     61,044
                                     -------   -------- 
Total minimum lease payments           5,573   $106,606
                                     =======   ========
Less amount representing interest     (2,526)
                                     -------
Present value of net minimum
 lease payments                      $ 3,047
                                     =======
</TABLE>

          Consolidated rent expense amounted to $10,522,000, $9,710,000 and
$9,175,000 for fiscal 1997, 1996 and 1995, respectively.  Rents for the
regulated business are expensed and the Company receives rate treatment as a
cost of service on a pay-as-you-go basis.

                                       59
<PAGE>
 
7.  Long-term debt and notes payable

          Long-term debt at September 30, 1997 and 1996 consisted of the
following:

<TABLE>
<CAPTION>
                                                   1997       1996
                                                 --------  ---------
                                                  (In thousands)
<S>                                             <C>        <C>
Unsecured 7.95% Senior Notes, due 2006, 
 payable in annual installments of $1,000       $  9,000   $ 10,000
Unsecured 9.57% Senior Notes, due 2006, 
 payable in annual installments of $2,000         18,000     20,000
Unsecured 9.76% Senior Notes, due 2004, 
 payable in annual installments of $3,000         24,000     27,000
Unsecured 11.2% Senior Notes, due 2002, 
 payable in annual installments of $2,000         12,000     14,000
Unsecured 10% Notes, due 2011                      2,303      2,303
Unsecured 6.09% Note, due 1998                    40,000          -
Unsecured 8.07% Senior Notes, due 2006,
 payable in annual installments of $4,000 
  beginning 2002                                  20,000     20,000
Unsecured 8.26% Senior Notes, due 2014,
 payable in annual installments of
 $1,818 beginning 2004                            20,000     20,000
Unsecured 9.75% Senior Notes, due 1996                 -      1,000
 
First Mortgage Bonds
 Series J, 9.40% due 2021                         17,000     17,000
 Series N, 8.69% due 2002                          5,000      7,000
 Series P, 10.43% due 2017                        25,000     25,000
 Series Q, 9.75% due 2020                         20,000     20,000
 Series R, 11.32% due 2004                        15,000     15,000
 Series T, 9.32% due 2021                         18,000     18,000
 Series U, 8.77% due 2022                         20,000     20,000
 Series V, 7.50% due 2007                         10,000     10,000
 
Medium term notes
 Series A, 1995-1, 6.67%, due 2025                10,000     10,000
 Series A, 1995-2, 6.27%, due 2020                10,000     10,000
 Series A, 1995-3, 6.20%, due 2000                 2,000      2,000
 
Rental property, propane and other term notes 
 due in installments through 2013                 20,879     24,538
                                                --------   --------
  Total long-term debt                           318,182    292,841
Less current maturities                          (15,201)   (16,679)
                                                --------   --------
                                                $302,981   $276,162
                                                ========   ========
</TABLE>

          The Company may prepay most of the Senior Notes or First Mortgage
Bonds in whole at any time, subject to a prepayment

                                       60
<PAGE>
 
premium.  The note agreements provide for certain cash flow requirements and
restrictions on additional indebtedness, sale of assets and payment of
dividends.  Under the most restrictive of such covenants, cumulative cash
dividends paid after December 31, 1988 may not exceed the sum of accumulated net
income for periods after December 31, 1988 plus $15,038,000.  At September 30,
1997, approximately $37,489,000 of retained earnings was not so restricted.

          As of September 30, 1997, all of the Greeley Gas Division utility
plant assets with a net book value of approximately $83,371,000 are subject to a
lien under the 9.4% Series J First Mortgage Bonds assumed by the Company in the
acquisition of GGC. Also, substantially all of the United Cities Division
utility plant assets, totaling approximately $314,591,000 are subject to a lien
under the Indenture of Mortgage of the Series N through V First Mortgage Bonds.

          UCG Energy and Woodward Marketing, Inc. ("WMI"), sole shareholders of
WMLLC, act as guarantors of a $12,500,000 credit facility for WMLLC with a bank.
No balance was outstanding on this credit facility at September 30, 1997.  UCG
Energy and WMI also act as joint and several guarantors on certain purchases of
natural gas and transportation services from suppliers by WMLLC. These
outstanding obligations amounted to $12,200,000 at September 30, 1997.

          Based on the borrowing rates currently available to the Company for
debt with similar terms and remaining average maturities, the fair value of
long-term debt at September 30, 1997 and 1996 is estimated using discounted cash
flow analysis to be $348,261,000 and $329,811,000, respectively.  It is not
currently advantageous for the Company to refinance its long-term debt because
of prepayment costs set forth in the various debt agreements.

         Maturities of long-term debt are as follows (in thousands):

               1998                         $ 15,201
               1999                           56,578
               2000                           14,790
               2001                           14,141
               2002                           14,205
               Thereafter                    203,267
                                            --------
                                            $318,182
                                            ========

Notes payable to banks

     The Company has committed short-term, unsecured bank credit facilities
totaling $187,000,000, $35,000,000 of which was unused at September 30, 1997.
One facility of $175,000,000 requires a commitment fee of .06% on the unused
portion.  A second facility for $12,000,000 requires a commitment fee of 5/32 of
1% on the

                                       61
<PAGE>
 
unused portion.  The committed lines are renewed or renegotiated at least
annually.

          The Company also had aggregate uncommitted credit lines of
$170,000,000, of which $159,900,000 was unused as of September 30, 1997. The
uncommitted lines have varying terms and the Company pays no fee for the
availability of the lines. Borrowings under these lines are made on a when and
as-available basis at the discretion of the banks.

          The weighted average interest rates on short-term borrowings
outstanding at September 30, 1997 and 1996 were 6.1% and 6.3%, respectively.

8.  Statement of cash flows supplemental disclosures

          Supplemental disclosures of cash flow information for 1997, 1996 and
1995 are presented below:

<TABLE>
<CAPTION>
 
                     1997     1996     1995
                    -------  -------  -------
<S>                 <C>      <C>      <C>
                         (In thousands)
Cash paid for
 Interest           $25,216  $32,778  $27,667
 Income taxes         9,736   14,562   18,746
</TABLE>

9. Common stock and stock options

          The Company issued 100,000 shares of its common stock in fiscal 1997
in connection with its Restricted Stock Grant Plan.

          Atmos has an Employee Stock Ownership Plan ("ESOP") and the United
Cities Division has a 401(k) savings plan, as discussed in Note 10.  Atmos
issued 200,482 shares under its ESOP in 1997. The Company has registered
1,600,000 shares for issuance under the ESOP, of which 512,871 shares were
available for future issuance on September 30, 1997.

          The Company also has a Direct Stock Purchase Plan ("DSPP").
Participants in the DSPP may have all or part of their dividends reinvested at a
3% discount from market prices. DSPP participants may purchase additional shares
of Company common stock as often as weekly with voluntary cash payments of at
least $25, up to an annual maximum of $100,000. At September 30, 1997, 712,596
shares were available for future issuance under the plan.

          On April 27, 1988, the Company adopted a Shareholders' Rights Plan and
declared a dividend of one right (a "Right") for each outstanding pre-split
share of common stock of the Company, payable to shareholders of record as of
May 10, 1988.  Each Right will entitle the holder thereof, until the earlier of
May 10, 1998 or the date of redemption of the Rights, to buy one share of common
stock of the Company at an exercise price of $30 per share, subject to
adjustment by the Board of Directors upon the

                                       62
<PAGE>
 
occurrence of certain events.  The Rights will be represented by the common
stock certificates and are not exercisable or transferable apart from the common
stock until a "Distribution Date" (which is defined in the Rights Agreement
between the Company and the Rights Agent as the date upon which the Rights
become separate from the common stock).

          At no time will the Rights have any voting rights.  The exercise price
payable and the number of shares of common stock or other securities or property
issuable upon exercise of the Rights are subject to adjustment from time to time
to prevent dilution.  Until the Distribution Date, the Company will issue one
Right with each share of common stock that becomes outstanding so that all
shares of common stock will have attached Rights.  After a Distribution Date,
the Company may issue Rights when it issues common stock if the Board deems such
issuance to be necessary or appropriate.

          The Rights have certain anti-takeover effects and may cause
substantial dilution to a person or entity that attempts to acquire the Company
on terms not approved by the Board of Directors except pursuant to an offer
conditioned upon a substantial number of Rights being acquired.  The Rights
should not interfere with any merger or other business combination approved by
the Board of Directors because, prior to the time the Rights become exercisable
or transferable, the Rights may be redeemed by the Company at $.05 per Right.

          In November 1997, the Board of Directors approved the adoption of new
shareholders' rights plan that will go into effect upon the expiration of the
existing shareholders' rights plan on May 10, 1998.  The provisions of the new
rights plan are similar to those of the existing rights plan.  However, the new
rights plan does differ from the existing plan in certain respects, including,
but not limited to the following: (i) the exercise price under the new plan will
be $80 per share vs. $30 per share under the existing plan; (ii) the rights
under the new plan may be redeemed by the Company prior to the time they become
exercisable or transferable at $.01 per right vs. $.05 per right under the
existing plan; and (iii) the nature of the events that will make the rights
exercisable has been modified to reflect new developments in the securities
markets since 1988.

          The Company's Restricted Stock Grant Plan for management and key
employees of the Company, which became effective October 1, 1987 and was amended
and restated in November 1997, provides for awards of common stock that are
subject to certain restrictions. The plan is administered by the Board of
Directors.  The members of the Board who are not employees of the Company make
the final determinations regarding participation in the plan, awards under the
plan, and restrictions on the restricted stock awarded.  The restricted stock
may consist of previously issued shares purchased on the open market or shares
issued directly from the Company.  The Company has registered 900,000 shares for
issuance under the plan.  Compensation expense of $437,000, $795,000 and

                                       63
<PAGE>
 
$1,015,000 was recognized in 1997, 1996 and 1995, respectively, in connection
with the issuance of shares under the plan.  At September 30, 1997, 252,500
shares were available for future award under the plan.

          In November 1994, the Board adopted the Outside Directors Stock-for-
Fee Plan, which plan was approved by the shareholders of the Company in February
1995 and was amended and restated in November 1997.  The plan permits non-
employee directors to receive all or part of their annual retainer and meeting
fees in stock rather than in cash.  The Company has registered 50,000 shares,
44,685 of which were available for future issuance under the plan as of
September 30, 1997.

          In October 1995, the FASB issued Statement No. 123 ("SFAS 123"),
"Accounting for Stock-Based Compensation."  This statement establishes a fair-
value-based method of accounting for employee stock options or similar equity
instruments and encourages, but does not require, all companies to adopt that
method of accounting for all of their employee stock compensation plans. SFAS
123 allows companies to continue to measure compensation cost for employee stock
options or similar equity instruments using the intrinsic value method of
accounting described in Accounting Principles Board Opinion No. 25, "Accounting
for Stock Issued to Employees."  The Company has elected to remain with this
method.  Because of the limited nature of the Company's stock-based compensation
plans, the adoption of SFAS 123 was immaterial.

10.  Employee retirement and stock ownership plans

          At September 30, 1997, the Company had four defined benefit pension
plans, covering the Western Kentucky Division employees, the Greeley Gas
Division employees, and the United Cities Division employees, while the fourth
covers all other Atmos employees.  The plans provide essentially the same
benefits to all employees.  Except for the United Cities Division, the plans'
benefits are based on years of service and the employee's compensation during
the highest paid five consecutive calendar years within the last 10 years of
employment.  The United Cities Division plan provides benefits based on years of
service and final average salary.  The Company's funding policy is to contribute
annually an amount in accordance with the requirements of the Employee
Retirement Income Security Act of 1974. Contributions are intended to provide
not only for benefits attributed to service to date but also for those expected
to be earned in the future.

                                       64
<PAGE>
 
          The following table sets forth the Atmos plan's funded status at
September 30, 1997 and 1996:

<TABLE>
<CAPTION>
 
                                                                                 1997                1996
                                                                               ---------           --------
<S>                                                  <C>                                                       <C>        <C>
                                                                                       (In thousands)
Actuarial present value of benefit obligations:
 
 Accumulated benefit obligation, including vested benefits of
    $75,027 and $77,089 in 1997 and 1996, respectively                         $ (78,591)          $(77,513)
                                                                               =========           ========
 Projected benefit obligation                                                  $ (87,999)          $(86,571)
 Plan assets at fair value                                                       102,865             90,157
                                                                               ---------           --------
 Funded status                                                                    14,866              3,586
 Unrecognized net asset being recognized over 15 years                                 -               (198)
 Unrecognized prior service cost                                                  (1,217)            (1,359)
 Unrecognized net (gain) loss                                                    (15,273)            (3,086)
                                                                               ---------           --------
 Accrued pension cost                                                          $  (1,624)          $ (1,057)
                                                                               =========           ========
</TABLE> 
 
        Net periodic pension cost for the Atmos plan for 1997, 1996 and 1995
included the following components:

<TABLE> 
<CAPTION> 
 
                                            1997        1996        1995
                                          --------   --------     --------
                                                  (In thousands)  
<S>                                       <C>          <C>        <C> 
Service cost                              $  2,263     $  2,235   $  1,862
Interest cost on projected                           
 benefit obligation                          6,356        6,434      6,060
Actual return on plan assets               (16,588)     (11,342)   (12,200)
Net amortization and deferral                8,322        3,298      5,007
                                          --------     --------   --------
Net periodic pension cost                 $    353     $    625   $    729
                                          ========     ========   ========
</TABLE> 
 

                                       65
<PAGE>
 
          The following table sets forth the Western Kentucky Division
plan's funded status at September 30, 1997 and 1996:

<TABLE> 
<CAPTION> 
                                                                             1997           1996
                                                                           --------       --------
                                                                                (In thousands)
<S>                                                                        <C>             <C> 
Actuarial present value of benefit obligations:
 
 Accumulated benefit obligation, including vested benefits of
    $31,877 and $30,984 in 1997 and 1996, respectively                      $(32,752)     $(30,983)
                                                                            ========      ========
 Projected benefit obligation                                               $(36,293)     $(35,673)
 Plan assets at fair value                                                    53,289        46,478
                                                                            --------      --------
 Funded status                                                                16,996        10,805
 Unrecognized prior service cost                                               3,976         4,829
 Unrecognized net (gain) loss                                                (10,065)       (4,361)
                                                                            --------      --------
 Prepaid pension cost                                                       $ 10,907      $ 11,273
                                                                            ========      ========
</TABLE> 
 
          Net periodic pension cost for 1997, 1996 and 1995 included the
following components:
 
<TABLE> 
<CAPTION> 
                                                        1997      1996     1995
                                                       ------    ------   ------
                                                             (In thousands)
<S>                                                  <C>        <C>        <C>  
Service cost                                         $   734    $    672   $    706
Interest cost                                          2,619       2,431      2,306
Actual return on plan assets                          (8,456)     (5,771)    (6,355)
Net amortization and deferral                          5,081       2,356      3,399
                                                     -------    --------   --------
Net periodic pension cost (benefit)                  $   (22)   $   (312)  $     56
                                                     ========   ========   ========
</TABLE>

          The weighted-average discount rates used in determining the actuarial
present value of the projected benefit obligations of the Atmos and Western
Kentucky Division retirement plans was 7.5% at June 30, 1997 and 1996. The rate
of increase in future compensation levels reflected in such determination was
4.0% for the years ended September 30, 1997 and 1996. The expected long-term
rate of return on plan assets was 9.0%, 9.5% and 10.0% for the years ended
September 30, 1997, 1996 and 1995, respectively. The plan assets consist
primarily of investments in common stocks, interest bearing securities and
interests in commingled pension trust funds. Prepaid pension cost is included in
deferred charges and other assets.

                                       66
<PAGE>
 
          The following table sets forth the Greeley Gas Division plan's funded
status at September 30, 1997 and 1996:

<TABLE>
<CAPTION>
 
                                        1997       1996
                                      ---------  ---------
<S>                                   <C>        <C>
                                         (In thousands)
Actuarial present value of benefit
 obligations:
 
 Accumulated benefit obligation,
  including vested benefits of
   $15,361 and $15,110 in 1997
   and 1996, respectively             $(16,033)  $(15,252)
                                      ========   ========
 Projected benefit obligation         $(17,700)  $(17,666)
 Plan assets at fair value              17,535     16,086
                                      --------   --------
 Funded status                            (165)    (1,580)
 Unrecognized net asset being
  recognized over 15 years              (1,231)    (1,521)
 Unrecognized prior service cost         1,344      1,480
 Unrecognized net (gain) loss             (372)     1,375
                                      --------   --------
 Accrued pension cost                 $   (424)  $   (246)
                                      ========   ========
</TABLE>

          Net periodic pension cost (credit) for the Greeley Gas Division plan
for 1997, 1996 and 1995 included the following components:

<TABLE>
<CAPTION>
 
                                   1997      1996      1995
                                 --------  --------  --------
<S>                              <C>       <C>       <C>
                                         (In thousands)
Service cost                     $   485   $   453   $   328
Interest cost on projected
 benefit obligation                1,277     1,185     1,208
Actual return on plan assets      (2,724)   (2,390)   (2,530)
Net amortization and deferral      1,167       810     1,217
                                 -------   -------   -------
Net periodic pension cost        $   205   $    58   $   223
                                 =======   =======   =======
</TABLE>

          Accumulated plan benefits were computed using the Projected Unit
Credit funding method.  The discount rate and rate of in  crease in future
compensation levels used in determining the actuarial present value of the
projected benefit obligations were 7.5% and 4.0% in both 1997 and 1996.  The
expected long-term rate of return on plan assets was 9.0%, 9.5% and 10.0% in
1997, 1996 and 1995, respectively.  Plan assets consist primarily of corporate
bonds, equity securities, mutual funds, partnership interests, and other
miscellaneous investments.

                                       67
<PAGE>
 
          The following table sets forth the United Cities Division plan's
funded status at September 30, 1997 and 1996:

<TABLE>
<CAPTION>
                                        1997       1996
                                      ---------  ---------
<S>                                   <C>        <C>
                                         (In thousands)
Actuarial present value of benefit
 obligations:
 
 Accumulated benefit obligation,
  including vested benefits of
   $60,086 and $45,528 in 1997
   and 1996, respectively             $(66,873)  $(54,130)
                                      ========   ========
 Projected benefit obligation          (75,159)   (69,652)
 Plan assets at fair value              86,162     71,978
                                      --------   --------
 Funded status                          11,003      2,326
 Unrecognized net asset being
  recognized over 15 years                 142        191
 Unrecognized prior service cost         1,750      1,143
 Unrecognized net (gain) loss          (15,785)    (1,819)
                                      --------   --------
 Prepaid (accrued) pension cost       $ (2,890)  $  1,841
                                      ========   ========
</TABLE>

          Net periodic pension cost (credit) for the United Cities Division plan
for 1997, 1996 and 1995 included the following components:

<TABLE>
<CAPTION>
 
                                   1997       1996      1995
                                 ---------  --------  ---------
<S>                              <C>        <C>       <C>
                                          (In thousands)
Service cost                     $  3,157   $ 3,116   $  3,451
Interest cost on projected
 benefit obligation                 5,050     4,720      4,296
Actual return on plan assets      (17,461)   (7,936)   (10,365)
Net amortization and deferral      11,420     2,372      5,772
                                 --------   -------   --------
Net periodic pension cost        $  2,166   $ 2,272   $  3,154
                                 ========   =======   ========
 
</TABLE>

          The weighted-average discount rates used in determining the actuarial
present value of the projected benefit obligations of the United Cities Division
retirement plan was 7.5% at September 30, 1997 and December 31, 1996.  The rate
of increase in future compensation levels reflected in such determination was
5.5% for the years ended September 30, 1997 and December 31, 1996.  The expected
long-term rate of return on plan assets was 9.0% for the years ended September
30, 1997, and December 31, 1996 and 1995. The plan assets consist primarily of
marketable equity securities, corporate and government debt securities, and
deposits with insurance companies.  Prepaid pension cost is included in deferred
charges and other assets.

                                       68
<PAGE>
 
          Effective October 1, 1987, the Company adopted a nonquali  fied
Supplemental Executive Benefits Plan ("Supplemental Plan") which provides
additional pension, disability and death benefits to the officers and certain
other employees of the Company. Expense recognized in connection with the
Supplemental Plan during fiscal 1997, 1996, and 1995 was $3,491,000, $2,708,000
and $2,158,000, respectively.  The Supplemental Plan was amended and restated in
May 1997 and amended again in August 1997 and November 1997.

          Atmos sponsors an Employee Stock Ownership Plan ("ESOP") for employees
other than those in the United Cities Division. Full time employees who have
completed one year of service, as defined in the plan, are eligible to
participate. Each participant enters into a salary reduction agreement with the
Company pursuant to which the participant's salary is reduced by an amount not
less than 2% nor more than 10%. Taxes on the amount by which the participant's
salary is reduced are deferred pursuant to Section 401(k) of the Internal
Revenue Code. The amount of the salary reduction is contributed by the Company
to the ESOP for the account of the participant. The Company may make a matching
contribution for the account of the participant in an amount determined each
year by the Board of Directors, which amount must be at least equal to 25% of
all or a portion of the participant's salary reduction. For the 1997 plan year,
the Board of Directors elected to match 100% of each participant's salary
reduction contribution up to 4% of the participant's salary. Matching
contributions to the ESOP amounted to $2,077,000, $1,944,000, and $1,977,000 for
1997, 1996 and 1995, respectively. The Directors may also approve discretionary
contributions, subject to the provisions of the Internal Revenue Code of 1986
and applicable regulations of the Internal Revenue Service. The Company recorded
a charge of $1,500,000 for a discretionary contribution in the year ended
September 30, 1996. Company contributions to the plan are expensed as incurred.

          The Company sponsors a 401(k) savings plan for the United Cities
Division employees.  The plan allows participants to make contributions toward
retirement savings.  Each participant may contribute up to 15% of qualified
compensation.  For employee contributions up to 6% of the participant's
qualified compensation, the Company will contribute 30% of the employee's
contribution.  The Company may also contribute up to an additional 20% of the
employee's contribution based on certain criteria specified in the plan.
Effective January 1, 1995, any additional contribution made by the Company will
be through the issuance of the Company's common stock.  The Company contributed
$694,000 for the nine months ended September 30, 1997, and $826,000 and $478,000
for the years ended December 31, 1996 and 1995, respectively.

11.  Other postretirement benefits

          Atmos sponsors two defined benefit postretirement plans other than
pensions.  Each provides health care benefits to

                                       69
<PAGE>
 
retired employees.  One provides benefits to the United Cities Division.  The
other Atmos plan offers medical benefits to all other retired Atmos employees.

          Effective October 1, 1993, the Company adopted Financial Accounting
Standards No. 106 ("SFAS No. 106"), "Employers' Accounting for Postretirement
Benefits Other Than Pensions". SFAS No. 106 focuses principally on
postretirement health care benefits and significantly changed the practice of
accounting for postretirement benefits on a pay-as-you-go basis by requiring
accrual of such benefit costs on an actuarial basis from the date each employee
reaches age 45 until the date of full eligibility for such benefits.  The
Company is amortizing on a straight line basis its initial transition
obligations over 20 years.  The initial transition obligation of the United
Cities Division was $8,894,000.  The initial transition obligation for all other
Divisions was $33,354,000.

          Substantially all of the Company's employees other than the United
Cities Division become eligible for these benefits if they reach retirement age
while working for the Company and attain 10 consecutive years of service after
age 45.  Participant contributions are required under these plans.  Prior to
June 1994, the plans were not funded.  In June 1994, the Company made its first
quarterly payment to the external trust set up to fund SFAS No. 106 costs in
excess of the pay-as-you-go cost in Kansas in accordance with an order of the
Kansas Corporation Commission. In April, 1995 it began external funding in
Colorado in accordance with an order of the Colorado Public Utility Commission.
The amount of funding will ultimately depend upon the ratemaking treatment
allowed in the Company's various rate jurisdictions.

          The components of net periodic postretirement benefits cost for the
Atmos plans for each of the years ended September 30, 1997, 1996 and 1995 are as
follows:

<TABLE>
<CAPTION>
                                  1997     1996     1995
                                 -------  -------  -------
<S>                              <C>      <C>      <C>
                                      (In thousands)
 
Service cost                     $1,599   $1,469   $1,497
Interest cost                     2,371    2,224    2,322
Actual return on plan assets        (28)     (39)     (18)
Amortization of transition
 obligation                       1,550    1,550    1,549
Prior service cost                  202        -        -
Net amortization and deferral      (217)     (80)    (150)
                                 ------   ------   ------
Net periodic postretirement
 benefits cost                   $5,477   $5,124   $5,200
                                 ======   ======   ======
</TABLE>

                                       70
<PAGE>
 
          The following is a reconciliation of the funded status of the Atmos
plans to the net postretirement benefits liability on the balance sheet as of
September 30, 1997 and 1996:

<TABLE>
<CAPTION>
                                               1997       1996
                                             ---------  ---------
                                                (In thousands)
<S>                                          <C>        <C>
Accumulated postretirement
 benefits obligation
Retirees                                     $(22,575)  $(19,849)
Fully eligible employees                         (721)    (6,426)
Other employees                               (10,328)    (4,644)
                                             --------   --------
                                              (33,624)   (30,919)
 
Plan assets                                     1,278        927
                                             --------   --------
Accumulated postretirement benefits
 obligation in excess of plan assets          (32,346)   (29,992)
Unrecognized net gain                          (6,602)    (4,775)
Unrecognized transition obligation             25,802     26,342
                                             --------   --------
Accrued postretirement benefits liability    $(13,146)  $ (8,425)
                                             ========   ========
</TABLE>

          In the latest actuarial calculation of the accrued postre  tirement
benefits liability, the assumed health care cost trend rate used to estimate the
cost of postretirement benefits was 7.5% for 1997 and 1998 and is assumed to
decrease gradually to 5.0% by 2001 and remain at that level thereafter.  The
trend for vision benefits is assumed to remain level for all years at 4.5%. The
effect of a 1% increase in the assumed health care cost trend rate for each
future year is $376,000 and $344,000 on the annual aggregate of the service and
interest cost components of net periodic postretirement benefit costs and
$2,760,000 and $2,377,000 on the accumulated postretirement benefits obligation
as of September 30, 1998 and 1997, respectively.  The assumed discount rate, the
rate at which liabilities could be settled, was 7.5% as of September 30, 1997
and 1996.  The expected long-term rate of return on plan assets was 5.3% for
1997 and 1996.

                                       71
<PAGE>
 
          The Company maintains a separate postretirement health care benefits
plan for the United Cities Division.  Substantially all of its employees will
become eligible for these benefits if they reach the normal retirement age while
working for the Company.

          The components of net periodic postretirement benefits cost for the
United Cities Division for each of the years ended September 30, 1997, 1996 and
1995 are as follows:

<TABLE>
<CAPTION>
                                  1997     1996     1995
                                 -------  -------  -------
                                       (In thousands)
<S>                              <C>      <C>      <C> 
Service cost                     $   86   $   89   $  120
Interest cost                       926      897    1,051
Actual return on plan assets       (274)    (212)    (107)
Amortization of transition
 obligation                         364      364      445
Net amortization and deferral       298      232      182
                                 ------   ------   ------
Net periodic postretirement
 benefits cost                   $1,400   $1,370   $1,691
                                 ======   ======   ======
</TABLE>

          The following is a reconciliation of the funded status of the United
Cities Division plan to the net postretirement benefits liability on the balance
sheet as of September 30, 1997 and 1996:

<TABLE>
<CAPTION>
 
                                               1997       1996
                                             ---------  ---------
                                                (In thousands)
<S>                                          <C>        <C> 
Accumulated postretirement
 benefits obligation
Retirees                                     $(16,331)  $(11,546)
Fully eligible employees                         (213)    (1,007)
Other employees                                  (750)      (816)
                                             --------   --------
                                              (17,294)   (13,369)
 
Plan assets                                     4,336      3,715
                                             --------   --------
Accumulated postretirement benefits
 obligation in excess of plan assets          (12,958)    (9,654)
Unrecognized net gain                           7,837      5,186
Unrecognized transition obligation              5,280      5,821
                                             --------   --------
Accrued postretirement benefits liability    $    159   $  1,353
                                             ========   ========
</TABLE>

          In the latest actuarial calculation of the accrued postre  tirement
benefits liability for the United Cities Division, the assumed health care cost
trend rate used to estimate the cost of postretirement benefits was 7.5% for
1997 and 1998, and is

                                       72
<PAGE>
 
assumed to decrease gradually to 5.0% by 2001 and remain at that level
thereafter.  The effect of a 1% increase in the assumed health care cost trend
rate for each future year is $88,000 and $79,000 on the annual aggregate of the
service and interest cost components of net periodic postretirement benefit
costs and $1,732,000 and $1,099,000 on the accumulated postretirement benefits
obligation as of September 30, 1997 and December 31, 1996, respectively.  The
assumed discount rate, the rate at which liabilities could be settled, was 7.5%
as of September 30, 1997 and December 31, 1996, respectively.  The expected
long-term rate of return on plan assets was 4.3% for 1997 and 1996.

          The Company is currently recovering other postretirement benefits
("OPEB") costs through its regulated rates under SFAS No. 106 accrual accounting
in Colorado, Kansas, the majority of its Texas service area and in Kentucky
(effective November 1, 1995).  It receives rate treatment as a cost of service
item for OPEB costs on the pay-as-you-go basis in Louisiana.  OPEB costs have
been specifically addressed in rate orders in each jurisdiction served by the
United Cities Division or have been included in a rate case and not disallowed.
However, the Company was required to recover the portion of the UCGC transition
obligation applicable to Virginia operations over 40 years, rather than 20
years, as in other states.  Management believes that accrual accounting in
accordance with SFAS No. 106 is appropriate and will continue to seek rate
recovery of accrual-based expenses in its ratemaking jurisdictions that have not
yet approved the recovery of these expenses.

                                       73
<PAGE>
 
SUPPLEMENTARY DATA

Quarterly Financial Data (Unaudited)

Summarized unaudited quarterly financial data are presented below. The sum of
net income per share by quarter may not equal the net income per share for the
year due to variations in the weighted average shares outstanding used in
computing such amounts.  The Company's natural gas and propane distribution
businesses are seasonal due to weather conditions in the Company's service
areas.  For further information on its effects on quarterly results, please see
the "Seasonality" discussion included in the "Management's Discussion and
Analysis of Financial Condition and Results of Operations" section herein.

<TABLE>
<CAPTION>
 
                                                                                 Quarter ended
                                      -------------------------------------------------------------------------------------
                                          December 31,           March 31,              June 30,           September 30,
                                      --------------------  --------------------  --------------------  -------------------
                                         1996       1995      1997        1996      1997       1996       1997       1996
                                      ---------   --------  --------    --------  -------    ---------  -------    --------
<S>                                   <C>         <C>       <C>         <C>       <C>        <C>        <C>        <C>
                                                                          (In thousands, except per share data)
 
Operating revenues                     $280,624   $253,439  $362,636    $341,867  $143,714   $175,240   $119,861   $116,145
Gross profit                             97,269     89,707   124,249     120,231    59,546     68,220     48,590     46,254
Operating income (loss)                  25,968     24,365    37,075      41,216     4,599      6,853    (15,331)    (3,173)
Net income (loss)                        18,155     18,496    30,625      35,906    (3,018)    (2,795)   (21,924)   (10,456)
Net income (loss) per share                 .62        .64      1.04        1.26      (.10)      (.10)      (.74)      (.36)
</TABLE>

                                       74
<PAGE>
 
ITEM 9.   CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON   ACCOUNTING AND
          FINANCIAL DISCLOSURE

None

                                    PART III

ITEM 10.  DIRECTORS, EXECUTIVE OFFICERS, PROMOTERS AND CONTROL PERSONS OF THE
          REGISTRANT

          Information regarding directors is incorporated herein by reference
from the Company's definitive proxy statement for the annual meeting of
shareholders on February 11, 1998.

          Information regarding executive officers is included in Part I.

ITEM 11.  EXECUTIVE COMPENSATION

          Incorporated herein by reference from the Company's definitive proxy
statement for the annual meeting of shareholders on February 11, 1998.

ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND   MANAGEMENT

          Incorporated herein by reference from the Company's definitive proxy
statement for the annual meeting of shareholders on February 11, 1998.

ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

          Incorporated herein by reference from the Company's definitive proxy
statement for the annual meeting of shareholders on February 11, 1998.

                                       75
<PAGE>
 
                                    PART IV

ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K

(a) 1 and 2. Financial statements and financial statement schedules.

          The financial statements listed in the accompanying Index to Financial
Statements are filed as part of this annual report.  No financial statement
schedules are required in this filing.

     3. Exhibits

          The exhibits listed in the accompanying Exhibits Index are filed as
part of this annual report.  The exhibits numbered 10.21(a) through 10.31(a) are
management contracts or compensatory plans or arrangements.

(b)  Reports on Form 8-K

     The Company filed a Form 8-K Current Report dated June 10, 1997 reporting
under Item 5, Other Events the following:

    (1) On June 10, 1997, Atmos, United Cities and the staff of the Illinois
        Commerce Commission jointly filed a proposed order, which if granted,
        would approve the merger of United Cities and Atmos.

    (2) The Illinois Commerce Commission issued an order dated June 25, 1997,
        approving the merger of United Cities and Atmos.

          The Company also filed a Form 8-K Current Report dated July 29, 1997
reporting under Item 2, Acquisition or Disposition of Assets, that the merger of
United Cities Gas Company with and into Atmos had closed effective July 31,
1997.  It also incorporated by reference the Financial Statements of the
Business Acquired and the required Pro Forma Financial Information under Item 7
Financial Statements and Exhibits.

                                       76
<PAGE>
 
                         INDEX TO FINANCIAL STATEMENTS
                            (Item 8, 14(a) 1 and 2)
<TABLE>
<CAPTION>
 
                                                       Page
<S>                                                    <C>
Number
 
Independent auditors' reports                             37
 
Financial statements:
 Consolidated balance sheets at September 30,
1997 and 1996                                             39
 
 Consolidated statements of income for the
  years ended September 30, 1997, 1996 and 1995           40
 
 Consolidated statements of shareholders'
  equity for the years ended September 30,
  1997, 1996 and 1995                                     41
Consolidated statements of cash flows for the years
  ended September 30, 1997, 1996 and 1995                 43
 
 Notes to consolidated financial statements            45-73
 
</TABLE>

          All financial statement schedules are omitted because the required
information is not present, or not present in amounts sufficient to require
submission of the schedule, or because the information required is included in
the financial statements and accompanying notes thereto.

                                       77
<PAGE>
 
                                   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.


                                      ATMOS ENERGY CORPORATION
                                            (Registrant)

                                     By  /s/ David L. Bickerstaff
                                        ------------------------
                                         David L. Bickerstaff
                                         Vice President and Controller

Date:   December 12, 1997


                         POWER OF ATTORNEY


          KNOW ALL MEN BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints Robert W. Best and Larry J.
Dagley, or either of them acting alone or together, as his true and lawful
attorney-in-fact and agent with full power to act alone, with full power of
substitution and resubstitution, for him and in his name, place and stead, in
any and all capacities, to sign any and all amendments to this Form 10-K, and to
file the same, with all exhibits thereto, and all other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorney-in-fact and agent full power and authority to do and perform each and
every act and thing requisite and necessary to be done, as fully to all intents
and purposes as he might or could do in person, hereby ratifying and confirming
all that said attorney-in-fact and agent, or his substitute or substitutes, may
lawfully do or cause to be done by virtue hereof.


          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 date indicated:



/s/ Robert W. Best           Chairman,          December 12, 1997
- -------------------------    President and
    Robert W. Best           Chief Executive
                             Officer

                                       78
<PAGE>
 
/s/ Larry J. Dagley          Executive Vice     December 12, 1997
- -------------------------    President and
    Larry J. Dagley          Chief Financial
                             Officer



/s/ David L. Bickerstaff     Vice President     December 12, 1997
- -------------------------    and Controller
    David L. Bickerstaff     (Principal
                             accounting officer)



/s/ Travis W. Bain, II       Director           December 12, 1997
- -------------------------
    Travis W. Bain, II



/s/ Dan Busbee               Director           December 12, 1997
- -------------------------
    Dan Busbee



/s/ Richard W. Cardin        Director           December 12, 1997
- -------------------------
    Richard W. Cardin



/s/ Thomas J. Garland        Director           December 12, 1997
- -------------------------
    Thomas J. Garland



/s/ Gene C. Koonce           Director           December 12, 1997
- -------------------------
    Gene C. Koonce



/s/ Vincent J. Lewis         Director           December 12, 1997
- -------------------------
    Vincent J. Lewis

                                       79
<PAGE>
 
/s/ Thomas C. Meredith       Director           December 12, 1997
- -------------------------
    Thomas C. Meredith



/s/ Phillip E. Nichol        Director           December 12, 1997
 -------------------------
    Phillip E. Nichol



/s/ Carl S. Quinn           Director           December 12, 1997
 -------------------------
    Carl S. Quinn



/s/ Lee E. Schlessman        Director           December 12, 1997
 -------------------------
    Lee E. Schlessman



/s/ Charles K. Vaughan       Director           December 12, 1997
- -------------------------
   Charles K. Vaughan



/s/ Richard Ware II          Director           December 12, 1997
 -------------------------
    Richard Ware II

                                       80
<PAGE>
 
                                 EXHIBITS INDEX
                                Item 14. (a) (3)

                                                         Page Number or
 Exhibit                                                Incorporation by
 Number                  Description                      Reference to
 --------   ------------------------------------    -------------------------

                   Plan of Reorganization
                   ----------------------

2.1         Agreement and Plan of Reorganization   Exhibit 2.1 of Form S-4
            dated July 19, 1996, by and between    filed October 4, 1996
            the Registrant and United Cities Gas
            Company

2.2         Amendment No. 1 to Agreement and       Exhibit 2.1(a) of Form S-
            Plan of Reorganization dated October   4 filed October 4, 1996
            3, 1996
            Articles of Incorporation and Bylaws

3.1         Restated Articles of Incorporation
            of the Company, as Amended (as of
            July 31, 1997)

3.2         Bylaws of the Company (Amended and
            Restated as of November 12, 1997)
            Instruments Defining Rights of
            Security Holders

4.1         Specimen Common Stock Certificate      Exhibit (4)(b) of Form
            (Atmos Energy Corporation)             10-K for fiscal year
                                                   ended September 30, 1988
                                                   (File No. 1-10042)

4.2(a)      Rights Agreement, dated as of April    Exhibit (1) of Form 8-K
            27, 1988, between the Company and      filed May 10, 1988 (File
            Morgan Shareholder Services Trust      No. 0-11249)
            Company

4.2(b)      Amendment No. 1 to Rights Agreement,   Exhibit 4.3(b) of Form
            dated August 10, 1994                  10-K for fiscal year
                                                   ended September 30, 1994
                                                   (File No. 1-10042)

4.2(c)      Certificate of Adjusted Price, dated   Exhibit 4.3(c) of Form
            August 15, 1994                        10-K for fiscal year
                                                   ended September 30, 1994
                                                   (File No. 1-10042)

4.3         Rights Agreement, dated as of          Exhibit 4.1 of Form 8-K
            November 12, 1997, between the         dated November 12, 1997
            Company and BankBoston, N.A.

                                       81
<PAGE>
 
                                                         Page Number or
 Exhibit                                                Incorporation by
 Number                  Description                      Reference to
 --------   ------------------------------------    -------------------------

9           Not applicable

            Material Contracts
            ------------------

10.1(a)     Note Purchase Agreement, dated as of   Exhibit 10(c) of Form 8-K
            December 21, 1987, by and between      filed January 7, 1988
            the Company and John Hancock Mutual    (File No. 0-11249)
            Life Insurance Company

            Note Purchase Agreement, dated as of
            December 21, 1987, by and between
            the Company and John Hancock
            Charitable Trust I (Agreement is
            identical to Hancock Agreement
            listed above except as to the
            parties thereto.)

            Note Purchase Agreement dated as of
            December 21, 1987, by and between
            the Company and Mellon Bank, N.A.,
            Trustee under Master Trust Agreement
            of AT&T Corporation, dated January
            1, 1984, for Employee Pension Plans
            - AT&T - John Hancock - Private
            Placement (Agreement is identical to
            Hancock Agreement listed above
            except as to the parties thereto.)

10.1(b)     Amendment to Note Purchase             Exhibit (10)(b)(ii) of
            Agreement, dated October 11, 1989,     Form 10-K for fiscal year
            by and between the Company and John    ended September 30, 1989
            Hancock Mutual Life Insurance          (File No. 1-10042)
            Company revising Note Purchase
            Agreement dated December 21, 1987
 
            Amendment to Note Purchase
            Agreement, dated October 11, 1989,
            by and between the Company and John
            Hancock Charitable Trust I revising
            Note Purchase Agreement dated
            December 21, 1987.  (Amendment is
            identical to Hancock amendment
            listed above except as to the
            parties thereto.)

                                       82
<PAGE>
 
                                                         Page Number or
 Exhibit                                                Incorporation by
 Number                  Description                      Reference to
 --------   ------------------------------------    -------------------------

            Amendment to Note Purchase
            Agreement, dated October 11, 1989,
            by and between the Company and
            Mellon Bank, N.A., Trustee under
            Master Trust Agreement of AT&T
            Corporation, dated January 1, 1984,
            for Employee Pension Plans - AT&T -
            John Hancock - Private Placement
            revising Note Purchase Agreement
            dated December 21, 1987 (Amendment
            is identical to Hancock amendment
            listed above except as to the
            parties thereto.)

10.1(c)     Amendment to Note Purchase             Exhibit 10(b)(iii) of
            Agreement, dated November 12, 1991,    Form 10-K for fiscal year
            by and between the Company and John    ended September 30, 1991
            Hancock Mutual Life Insurance          (File No. 1-10042)
            Company revising Note Purchase
            Agreement dated December 21, 1987

            Amendment to Note Purchase
            Agreement, dated November 12, 1991,
            by and between the Company and John
            Hancock Charitable Trust I revising
            Note Purchase Agreement dated
            December 21, 1987.  (Amendment is
            identical to Hancock amendment
            listed above except as to the
            parties thereto.)

            Amendment to Note Purchase
            Agreement, dated November 12, 1991,
            by and between the Company and
            Mellon Bank, N.A., Trustee under
            Master Trust Agreement of AT&T
            Corporation, dated January 1, 1984,
            for Employee Pension Plans - AT&T -
            John Hancock - Private Placement
            revising Note Purchase Agreement
            dated December 21, 1987.  (Amendment
            is identical to Hancock amendment
            above except as to the parties
            thereto.)

10.2(a)     Note Purchase Agreement, dated as of   Exhibit 10(c) of Form 10-
            October 11, 1989, by and between the   K for fiscal year ended
            Company and John Hancock Mutual Life   September 30, 1989 (File
            Insurance Company                      No. 1-10042)

                                       83
<PAGE>
 
                                                         Page Number or
 Exhibit                                                Incorporation by
 Number                  Description                      Reference to
 --------   ------------------------------------    -------------------------

10.2(b)     Amendment to Note Purchase             Exhibit 10(c)(ii) of Form
            Agreement, dated as of November 12,    10-K for fiscal year
            1991, by and between the Company and   ended September 30, 1991
            John Hancock Mutual Life Insurance     (File No. 1-10042)
            Company revising Note Purchase
            Agreement dated October 11, 1989

10.3(a)     Note Purchase Agreement, dated as of   Exhibit 10(f)(i) of Form
            August 29, 1991, by and between the    10-K for fiscal year
            Company and The Variable Annuity       ended September 30, 1991
            Life Insurance Company                 (File No. 1-10042)

10.3(b)     Amendment to Note Purchase             Exhibit 10(f)(ii) of Form
            Agreement, dated November 26, 1991,    10-K for fiscal year
            by and between the Company and The     ended September 30, 1991
            Variable Annuity Life Insurance        (File No. 1-10042)
            Company revising Note Purchase
            Agreement dated August 29, 1991

10.4        Note Purchase Agreement, dated as of   Exhibit (10)(f) of Form
            August 31, 1992, by and between the    10-K for fiscal year
            Company and The Variable Annuity       ended September 30, 1992
            Life Insurance Company                 (File No. 1-10042)

10.5        Note Purchase Agreement, dated         Exhibit 10.1 of Form 10-Q
            November 14, 1994, by and among the    for quarter ended
            Company and New York Life Insurance    December 31, 1994 (File
            Company, New York Life Insurance and   No. 1-10042)
            Annuity Corporation, The Variable
            Annuity Life Insurance Company,
            American General Life Insurance
            Company, and Merit Life Insurance
            Company

10.6        Loan Agreement by and between the      Exhibit 10.1 of Form 10-Q
            Company and NationsBank of Texas,      for quarter ended
            N.A. dated as of November 26, 1996     December 31, 1996 (File
                                                   No. 1-10042)

10.7        Indenture of Mortgage, dated as of     Exhibit to Registration
            July 15, 1959, from United Cities      Statement of United
            Gas Company to First Trust of          Cities Gas Company on
            Illinois, National Association, and    Form S-3 (File No. 33-
            M.J. Kruger, as Trustees, as amended   56983).
            and supplemented through December 1,
            1992 (the Indenture of Mortgage
            through the 20th Supplemental
            Indenture)

                                       84
<PAGE>
 
                                                         Page Number or
 Exhibit                                                Incorporation by
 Number                  Description                      Reference to
 --------   ------------------------------------    -------------------------

10.7(a)     Twenty-First Supplemental Indenture
            dated as of February 5, 1997 by and
            among United Cities Gas Company and
            Bank of America Illinois and First
            Trust National Association and
            Russell C. Bergman supplementing
            Indenture of Mortgage dated as of
            July 15, 1959

10.7(b)     Twenty-Second Supplemental Indenture
            dated as of July 29, 1997 by and
            among the Company and First Trust
            National Association and Russell C.
            Bergman supplementing Indenture of
            Mortgage dated as of July 15, 1959

10.8        Form of Indenture between United       Exhibit to Registration
            Cities Gas Company and First Trust     Statement of United
            of Illinois, National Association,     Cities Gas Company on
            as Trustee dated as of November 15,    Form S-3 (File No. 33-
            1995                                   56983)

10.8(a)     First Supplemental Indenture between
            the Company and First Trust of
            Illinois, National Association, as
            Trustee dated as of July 29, 1997

10.9(a)     Seventh Supplemental Indenture,        Exhibit 10.1 of Form 10-Q
            dated as of October 1, 1983 between    for quarter ended June
            Greeley Gas Company ("the Greeley      30, 1994 (File No. 1-
            Gas Division") and the Central Bank    10042)
            of Denver, N.A. ("Central Bank")

10.9(b)     Ninth Supplemental Indenture, dated    Exhibit 10.2 of Form 10-Q
            as of April 1, 1991, between the       for quarter ended June
            Greeley Gas Division and Central       30, 1994 (File No. 1-
            Bank                                   10042)

10.9(c)     Bond Purchase Agreement, dated as of   Exhibit 10.3 of Form 10-Q
            April 1, 1991, between the Greeley     for quarter ended June
            Gas Division and Central Bank          30, 1994 (File No. 1-
                                                   10042)

10.9(d)     Tenth Supplemental Indenture, dated    Exhibit 10.4 of Form 10-Q
            as of December 1, 1993, between the    for quarter ended June
            Company and Colorado National Bank,    30, 1994 (File No. 1-
            formerly Central Bank                  10042)

                                       85
<PAGE>
 
                                                         Page Number or
 Exhibit                                                Incorporation by
 Number                  Description                      Reference to
 --------   ------------------------------------    -------------------------

            Gas Supply Contracts

10.10(a)    Firm Gas Transportation Agreement
            No. 123535 dated November 1, 1995
            between Greeley Gas Company and
            Public Service Company of Colorado

10.10(b)    Transportation Storage Service         Exhibit 10.6(b) of Form
            Agreement No. TA-0544 between          10-K for fiscal year
            Greeley Gas Company and Williams       ended September 30, 1994
            Natural Gas Company dated October 1,   (File No. 1-10042)
            1993

10.10(c)    No-Notice Transportation Service       Exhibit 10.6(c) of Form
            Agreement No. 31013, Rate Schedule     10-K for fiscal year
            NNT-1, between Greeley Gas Company     ended September 30, 1994
            and Colorado Interstate Gas Company,   (File No. 1-10042)
            as amended, dated October 1, 1993
            (term extended to April 30, 2000 by
            letter dated January 2, 1996)

10.10(d)    Firm Transportation Service            Exhibit 10.6(d) of Form
            Agreement No. 35009, Rate Schedule     10-K for fiscal year
            TF-2, between Greeley Gas Company      ended September 30, 1994
            and Colorado Interstate Gas Company,   (File No. 1-10042)
            as amended, dated October 1, 1993
            (term extended to April 30, 2000 by
            letter dated January 2, 1996)

10.11       Amarillo Supply Agreement dated        Exhibit 10.7(a) of Form
            January 2, 1993 between Energas and    10-K for fiscal year
            Pioneer Natural Resources , USA,       ended September 30, 1994
            Inc. (formerly Mesa Operating          (File No. 1-10042)
            Company)

10.12(a)    Agreement for Natural Gas Service      Exhibit 10(o)(ii) of Form
            for Distribution and Resale between    10-K for fiscal year
            Trans La and LIG dated October 28,     ended September 30, 1991
            1991                                   (File No. 1-10042)

10.12(b)    Agreement for Intrastate               Exhibit 10(o)(iii) of
            Transportation of Natural Gas          Form 10-K for fiscal year
            between Trans La and LIG dated         ended September 30, 1991
            October 28, 1991                       (File No. 1-10042)

10.13(a)    Gas Transportation Agreement between   Exhibit 10.3 of Form 10-Q
            Texas Gas and Western Kentucky Gas     for quarter ended
            dated November 1, 1993 (Contract no.   December 31, 1993 (File
            T3355, zone 3)                         No. 1-10042)

                                       86
<PAGE>
 
                                                         Page Number or
 Exhibit                                                Incorporation by
 Number                  Description                      Reference to
 --------   ------------------------------------    -------------------------

10.13(b)    Gas Transportation Agreement between   Exhibit 10.4 of Form 10-Q
            Texas Gas and Western Kentucky Gas     for quarter ended
            dated November 1, 1993 (Contract no.   December 31, 1993 (File
            T3819, zone 4)                         No. 1-10042)

10.13(c)    Gas Transportation Agreement between   Exhibit 10.5 of Form 10-Q
            Texas Gas and Western Kentucky Gas     for quarter ended
            dated November 1, 1993 (Contract no.   December 31, 1993 (File
            N0210, zone 2, Contract no. N0340,     No. 1-10042)
            zone 3, Contract no. N0435, zone 4)

10.14(a)    Gas Transportation Agreement,          Exhibit 10.17(a) of Form
            Contract No. 2550, dated September     10-K for fiscal year
            1, 1993, between Tennessee Gas         ended September 30, 1993
            Pipeline Company, a division of        (File No. 1-10042)
            Tenneco, Inc. ("Tennessee Gas"), and
            Western Kentucky, Campbellsville
            Service Area

10.14(b)    Gas Transportation Agreement,          Exhibit 10.17(b) of Form
            Contract No. 2546, dated September     10-K for fiscal year
            1, 1993, between Tennessee Gas and     ended September 30, 1993
            Western Kentucky, Danville Service     (File No. 1-10042)
            Area

10.14(c)    Gas Transportation Agreement,          Exhibit 10.17(c) of Form
            Contract No. 2385, dated September     10-K for fiscal year
            1, 1993, between Tennessee Gas and     ended September 30, 1993
            Western Kentucky, Greensburg et al     (File No. 1-10042)
            Service Area

10.14(d)    Gas Transportation Agreement,          Exhibit 10.17(d) of Form
            Contract No. 2551, dated September     10-K for fiscal year
            1, 1993, between Tennessee Gas and     ended September 30, 1993
            Western Kentucky, Harrodsburg          (File No. 1-10042)
            Service Area

10.14(e)    Gas Transportation Agreement,          Exhibit 10.17(e) of Form
            Contract No. 2548, dated September     10-K for fiscal year
            1, 1993, between Tennessee Gas and     ended September 30, 1993
            Western Kentucky, Lebanon Service      (File No. 1-10042)
            Area

10.15       Gas Service Agreement (Service for     Exhibit 10.5 of Form 10-Q
            Firm Transportation) between Energas   for quarter ended
            and Westar Transmission Company        December 31, 1996 (File
            dated January 1, 1996.                 No. 1-10042)

                                       87
<PAGE>
 
                                                         Page Number or
 Exhibit                                                Incorporation by
 Number                  Description                      Reference to
 --------   ------------------------------------    -------------------------

10.16       Gas Service Agreement (Service for     Exhibit 10.7 of Form 10-Q
            Firm Transportation) between Westar    for quarter ended
            Transmission Company and EnerMart      December 31, 1996 (File
            dated January 1, 1996                  No. 1-10042)

10.17       Gas Service Agreement (Service for     Exhibit 10.8 of Form 10-Q
            Firm Transportation) between KN        for quarter ended
            Westex and EnerMart Trust dated        December 31, 1996 (File
            January 1, 1996                        No. 1-10042)

10.18       Gas Sales Agreement (Irrigation)       Exhibit 10.11 of Form 10-
            between KN Marketing and EnerMart      Q for quarter ended
            Trust dated March 1, 1996.             December 31, 1996 (File
                                                   No. 1-10042)

10.19       Gas Sales Agreement (Swing) between    Exhibit 10.13 of Form 10-
            Energas and KN Marketing, dated        Q for quarter ended
            January 1, 1996.                       December 31, 1996 (File
                                                   No. 1-10042)

10.20       Operating Agreement between Energas    Exhibit 10.15 of Form 10-
            and Westar Transmission Company,       Q for quarter ended
            effective December 1, 1996.            December 31, 1996 (File
                                                   No. 1-10042)

            Executive Compensation Plans and
            Arrangements

10.21(a)    *Severance Agreement dated April 1,    Exhibit 10.3 of Form 10-Q
            1995 between the Company and J.        for quarter ended June
            Charles Goodman                        30, 1995 (File No. 1-
                                                   10042)

10.21(b)    *Severance Agreement amended and       Exhibit 10(r)(iii) of
            restated as of August 8, 1991,         Form 10-K for fiscal year
            between the Company and Don E. James   ended September 30, 1991
                                                   (File No. 1-10042)

10.21(c)    *Severance Agreement dated May 3,      Exhibit 10.2 of Form 10-Q
            1995 between the Company and Mary S.   for quarter ended June
            Lovell                                 30, 1995 (File No. 1-
                                                   10042)

10.21(d)    *Severance Agreement dated August      Exhibit 10.18(g) of Form
            14, 1996, between the Company and      10-K for fiscal year
            Glen A. Blanscet                       ended September 30, 1996
                                                   (File No. 1-10042)

                                       88
<PAGE>
 
                                                         Page Number or
 Exhibit                                                Incorporation by
 Number                  Description                      Reference to
 --------   ------------------------------------    -------------------------

10.21(e)    *Severance Agreement dated March 10,   Exhibit 10.1 of Form 10-Q
            1997, between the Company and Robert   for quarter ended March
            W. Best                                31, 1997 (File No. 1-
                                                   10042)

10.21(f)    *Severance Agreement dated May 10,
            1997, between the Company and Larry
            J. Dagley

10.22       *Atmos Energy Corporation Mini-Med     Exhibit 10.22 of Form 10-
            Plan, as restated effective July 1,    K for fiscal year ended
            1996                                   September 30, 1996 (File
                                                   No. 1-10042)

10.23       *Atmos Energy Corporation Deferred     Exhibit 10(x) of Form 10-
            Compensation Plan for Outside          K for fiscal year ended
            Directors                              September 30, 1992 (File
                                                   No. 1-10042)

10.24       *Atmos Energy Corporation Retirement   Exhibit 10(y) of Form 10-
            Plan for Outside Directors             K for fiscal year ended
                                                   September 30, 1992 (File
                                                   No. 1-10042)

10.24(a)    *Amendment No. 1 to the Atmos Energy   Exhibit 10.2 of Form 10-Q
            Corporation Retirement Plan for        for quarter ended
            Outside Directors                      December 31, 1996 (File
                                                   No. 1-10042)

10.25(a)    *Description of Car Allowance          Exhibit 10.26(a) of Form
            Payments                               10-K for fiscal year
                                                   ended September 30, 1993
                                                   (File No. 1-10042)

10.25(b)    *Description of Financial and Estate
            Planning Program

10.25(c)    *Description of Sporting Events        Exhibit 10.26(c) of Form
            Program                                10-K for fiscal year
                                                   ended September 30, 1993
                                                   (File No. 1-10042)

10.26       *Atmos Energy Corporation              Exhibit 10.1 of Form 10-Q
            Supplemental Executive Benefits Plan   for quarter ended June
            (Amended and Restated May 14, 1997)    30, 1997 (File No. 1-
                                                   10042)

10.26(a)    *Amendment No. 1 to the Atmos Energy
            Corporation Supplemental Executive
            Benefits Plan

                                       89
<PAGE>
 
                                                         Page Number or
 Exhibit                                                Incorporation by
 Number                  Description                      Reference to
 --------   ------------------------------------    -------------------------

10.26(b)    *Amendment No. 2 to the Atmos Energy
            Corporation Supplemental Executive
            Benefits Plan

10.27       *Atmos Energy Corporation Restricted
            Stock Grant Plan (Amended and
            Restated as of November 12, 1997)

10.28       *Atmos Energy Corporation Outside
            Directors Stock-for-Fee Plan
            (Amended and Restated as of November
            12, 1997)

10.29       *Atmos Energy Corporation Executive    Exhibit 10.4 of Form 10-Q
            Annual Performance Bonus Plan          for quarter ended
            (Amended and Restated as of November   December 31, 1996 (File
            13, 1996)                              No. 1-10042)

10.30       *Consulting Agreement between the      Exhibit 10.2 of Form 10-Q
            Company and Charles K. Vaughan,        for quarter ended June
            effective October 1, 1994              30, 1997 (File No. 1-
                                                   10042)

10.30(a)    *Amendment No. 1 to Consulting         Exhibit 10.3 of Form 10-Q
            Agreement between the Company and      for quarter ended June
            Charles K. Vaughan, dated May 14,      30, 1997 (File No. 1-
            1997                                   10042)

10.31       *The Atmos Energy Corporation
            Executive Retiree Life Plan

10.31(a)    *Amendment No. 1 to The Atmos Energy
            Corporation Executive Retiree Life
            Plan

11          Not applicable

12          Not applicable

13          Not applicable

16          Not applicable

18          Not applicable

                                       90
<PAGE>
 
                                                         Page Number or
 Exhibit                                                Incorporation by
 Number                  Description                      Reference to
 --------   ------------------------------------    -------------------------

            Other Exhibits, as indicated

21          Subsidiaries of the registrant

22          Not applicable

23.1        Consent of independent auditors,
            Ernst & Young LLP

23.2        Consent of independent auditors,
            Arthur Andersen LLP

24          Power of Attorney                      Signature page of Form
                                                   10-K for fiscal year
                                                   ended September 30, 1997

27          Financial Data Schedule for Atmos
            for year ended September 30, 1997

28          Not applicable

- --------------------------
* This exhibit constitutes a "management contract or compensatory plan,
contract, or arrangement."

                                       91

<PAGE>
 
                                                                     Exhibit 3.1

                       RESTATED ARTICLES OF INCORPORATION
                                       OF
                            ATMOS ENERGY CORPORATION
                                   AS AMENDED


                                  ARTICLE ONE

     Atmos Energy Corporation, pursuant to the provisions of Article 4.07 of the
Texas Business Corporation Act, adopted Restated Articles of Incorporation,
which accurately copied the Articles of Incorporation and all amendments thereto
that were in effect to date and such Restated Articles of Incorporation
contained no change in any provision thereof.

                                  ARTICLE TWO

     Such Restated Articles of Incorporation were adopted by resolution of the
board of directors of the corporation on the 8th day of November, 1989.

                                 ARTICLE THREE

     The Restated Articles of Incorporation have been further amended pursuant
to that certain Plan of Merger by and between Atmos Energy Corporation and
United Cities Gas Company, an Illinois and Virginia corporation.  The Articles
of Incorporation and all amendments and supplements thereto as superseded by the
Restated Articles of Incorporation and as amended pursuant to the Plan of Merger
are as follows:
 
                                   ARTICLE I.

     The name of the corporation shall be Atmos Energy Corporation (the
"Corporation").

                                       1
<PAGE>
 
                                  ARTICLE II.

     The purposes for which the Corporation is organized are the transaction of
any or all lawful business for which corporations may be incorporated under the
Texas Business Corporation Act, including, but not limited to, the
transportation and distribution of natural gas by pipeline as a public utility,
except that with respect to the Commonwealth of Virginia, the Corporation may
only conduct such business as is permitted to be conducted by a public service
company engaged in the transportation and distribution of natural gas by
pipeline.

                                  ARTICLE III.

     The Corporation is incorporated in the State of Texas and the Commonwealth
of Virginia. The post office address of the registered office of this
Corporation in the State of Texas is Three Lincoln Centre, Suite 1800, 5430 LBJ
Freeway, Dallas, Texas 75240, and the registered agent for service of this
Corporation at the same address is Glen A. Blanscet.  The post office address of
the registered office of this Corporation in the Commonwealth of Virginia is
Riverfront Plaza, East Tower, 951 East Byrd Street, Richmond, Virginia 23219-
4074, and the registered agent for service of this Corporation at the same
address is Allen C. Goolsby, III, such registered agent being a resident of the
Commonwealth of Virginia and a member of the Virginia State Bar.

                                  ARTICLE IV.

     The period of the Corporation's duration shall be perpetual.

                                   ARTICLE V.

     The Corporation shall not commence business until it has received for the
shares consideration of the value of One Thousand Dollars ($1,000) consisting of
money, labor done or property actually received.


                                  ARTICLE VI.

     1.   Number of Directors.  The number of directors constituting the present
board of directors is thirteen (13); however, thereafter the number of directors
constituting the Board of Directors shall be fixed by the Bylaws of the
Corporation.  No director shall be removed during his term of office except for
cause and by the affirmative vote of the holders of seventy-five percent (75%)
of the shares then entitled to vote at an election of directors.  The names and
addresses of the persons who are to serve as directors until the next annual
meeting of the shareholders or until their successors are duly elected and
qualified are as follows:

                                       2
<PAGE>
 
           Name                          Address

     Travis W. Bain II              2001 Coit Road
                                    Suite 130
                                    Plano, TX 75075

     Robert W. Best                 Three Lincoln Centre
                                    Suite 1800
                                    5430 LBJ Freeway
                                    Dallas, Texas 75240

     Dan Busbee                     2200 Ross Avenue
                                    Suite 2200
                                    Dallas, TX 75201

     Richard W. Cardin              107 Sheffield Court
                                    Nashville, TN 37215

     Thomas J. Garland              Tusculum College
                                    McCormick Hall, 1st Floor
                                    Greeneville, TN 37743

     Gene C. Koonce                 5300 Maryland Way
                                    Brentwood, TN 37027

     Vincent Lewis                  Meadows Office Complex
                                    301 Route #17, North
                                    Rutherford, NJ 07070

     Thomas C. Meredith             Western Kentucky University
                                    Bowling Green, KY  42101

     Phillip E. Nichol              301 Commerce
                                    Suite 2800
                                    Ft. Worth, TX 76102

     Carl S. Quinn                  14 East 75th Street, #8B
                                    New York, NY 10021

     Lee E. Schlessman              1301 Pennsylvania Street
                                    Penn Center
                                    Suite 800
                                    Denver, CO  80203

     Charles K. Vaughan             Three Lincoln Centre
                                    Suite 1800
                                    5430 LBJ Freeway
                                    Dallas, TX 75240

     Richard Ware II                Plaza One/Box One
                                    Amarillo, TX  79105

     2.   Election and Term.  The directors shall be divided into 

                                       3
<PAGE>
 
three classes, designated Class I, Class II and Class III. Each class shall
consist, as nearly as may be possible, of one-third of the total number of
directors constituting the entire Board of Directors. At each annual meeting of
shareholders, successors to the class of directors whose term expires at that
annual meeting shall be elected for a three-year term. Directors shall be
elected by a majority vote of the shares of the Common Stock entitled to vote in
the election of directors and represented in person or by proxy at a meeting of
shareholders at which a quorum is present. If the number of directors is
changed, any increase or decrease shall be apportioned among the classes so as
to maintain the number of directors in each class as nearly equal as possible,
and any additional director of any class elected by the shareholders to fill a
vacancy resulting from an increase in such class shall hold office for a term
that shall coincide with the remaining term of that class, but in no case will a
decrease in the number of directors shorten the term of any incumbent director.
A director shall hold office until the annual meeting for the year in which his
term expires and until his successor shall be duly elected and qualified,
subject, however, to prior death, resignation, retirement, disqualification or
removal from office.

                                  ARTICLE VII.

     1.   Capitalization.

     The aggregate number of shares which the Corporation shall have the
authority to issue is Seventy-Five Million (75,000,000) shares of Common Stock
having no par value.

     2.   Designation and Statement of Preferences, Limitations and Relative
Rights of Common Stock.

     2.01 Subject to the provisions of law, including the Texas Business
Corporation Act and the Virginia Stock Corporation Act and to the conditions set
forth in any law, including resolution of the Board of Directors of the
Corporation, such dividends (payable in cash, stock or otherwise) as may be
determined by the Board of Directors may be declared and paid on the Common
Stock from time to time out of any funds legally available therefor.

     2.02 The holders of the Common Stock shall exclusively possess full voting
power for the election of directors and for all other purposes.  In the exercise
of its voting power, the Common Stock shall be entitled to one vote for each
share held.

     3.   Provisions Applicable to All Classes of Stock.

     3.01 Subject to applicable law, the Board of Directors may in its
discretion issue from time to time authorized but unissued shares for such
consideration as it may determine.  The 

                                       4
<PAGE>
 
shareholders shall have no pre-emptive rights, as such holders, to purchase any
shares or securities of any class which may at any time be sold or offered for
sale by the Corporation.

     3.02 At each election for directors every shareholder entitled to vote at
any meeting shall have the right to vote, in person or by proxy, the number of
shares owned by him for as many persons as there are directors to be elected.
Cumulative voting of shares of stock in the election of directors or otherwise
is hereby expressly prohibited.

     3.03 The Corporation shall be entitled to treat the person in whose name
any share or other security is registered as the owner thereof, for all
purposes, and shall not be bound to recognize any equitable or other claim to or
interest in such shares or other security on the part of any other person,
whether or not the Corporation shall have notice thereof.

     4.   Provisions Applicable to Certain Business Combinations.

     4.01 The affirmative vote of the holders of not less than seventy-five
percent (75%) of the outstanding shares of "Voting Stock" (as hereinafter
defined) held by stockholders other than a "Substantial Shareholder" (as
hereinafter defined) shall be required for the approval or authorization of any
"Business Combination" (as hereinafter defined) of the Corporation with any
Substantial Shareholder; provided, however, that the seventy-five percent (75%)
voting requirement shall not be applicable if either:

          (i) The "Continuing Directors" (as hereinafter defined) of the
     Corporation by the affirmative vote of at least a majority (a) have
     expressly approved in advance the acquisition of the outstanding shares of
     Voting Stock that caused such Substantial Shareholder to become a
     Substantial Shareholder, or (b) have expressly approved such Business
     Combination either in advance of or subsequent to such Substantial
     Shareholder's having become a Substantial Shareholder; or

          (ii)   The cash or fair market value (as determined by at least a
     majority of the Continuing Directors) of the property, securities or other
     consideration to be received per share by holders of Voting Stock of the
     Corporation in the Business Combination is not less than the "Highest Per
     Share Price" or the "Highest Equivalent Price" (as these terms are
     hereinafter defined) paid by the Substantial Shareholder in acquiring any
     of its holdings of the Corporation's Voting Stock.

                                       5
<PAGE>
 
     4.02  For purposes of this paragraph 4 of Article VII:

          (i) The term "Business Combination" shall include, without limitation,
     (a) any merger or consolidation of the Corporation, or any entity
     controlled by or under common control with the Corporation, with or into
     any Substantial Shareholder, or any entity controlled by or under common
     control with the Substantial Shareholder, (b) any merger or consolidation
     of a Substantial Shareholder, or any entity controlled by or under common
     control with the Corporation, (c) any sale, lease, exchange, transfer or
     other disposition of all or substantially all of the property and assets of
     the Corporation, or any entity controlled by or under common control with
     the Corporation, to a Substantial Shareholder, or any entity controlled by
     or under common control with the Substantial Shareholder, (d) any purchase,
     lease, exchange, transfer or other acquisition of all or substantially all
     of the property and assets of a Substantial Shareholder or any entity
     controlled by or under common control with the Corporation, (e) any
     recapitalization of the Corporation that would have the effect of
     increasing the voting power of a Substantial Shareholder, and (f) any
     agreement, contract or other arrangement providing for any of the
     transactions described in this definition of Business Combination.

          (ii) The term "Substantial Shareholder" shall mean and include any
     individual, corporation, partnership or other person or entity which,
     together with its "Affiliates" and "Associates" (as those terms are defined
     in Rule 12b-2 of the General Rules and Regulations promulgated under the
     Securities Exchange Act of 1934 (the "Exchange Act") as in effect at the
     date of the adoption hereof), "Beneficially Owns" (as defined in Rule 13d-3
     of the Exchange Act) an aggregate of 10 percent or more of the outstanding
     Voting Stock of the Corporation, and any Affiliate or Associate of any such
     individual, corporation, partnership or other person or entity.

                                       6
<PAGE>
 
          (iii)  Without limitation, any share of Voting Stock of the
     Corporation that any Substantial Shareholder has the right to acquire at
     any time (notwithstanding that Rule 13d-3 of the Exchange Act deems such
     shares to be beneficially owned only if such right may be exercised within
     60 days) pursuant to any agreement, or upon exercise of conversion rights,
     warrants or options, or otherwise, shall be deemed to be Beneficially Owned
     by the Substantial Shareholder and to be outstanding for purposes of clause
     (ii) above.

          (iv) For the purposes of subparagraph 4.01(ii) of this paragraph 4 of
     Article VII, the term "other consideration to be received" shall include,
     without limitation, Common Stock or other capital stock of the Corporation
     retained by its existing stockholders other than Substantial Shareholders
     or other parties to such Business Combination in the event of a Business
     Combination in which the Corporation is the surviving corporation.

          (v) The term "Voting Stock" shall mean all of the outstanding shares
     of Common Stock entitled to vote on each matter on which the holders of
     record of Common Stock shall be entitled to vote, and each reference to a
     proportion of shares of Voting Stock shall refer to such proposition of the
     votes entitled to be cast by such shares.

          (vi) The term "Continuing Director" shall mean a Director who was a
     member of the Board of Directors of the Corporation immediately prior to
     the time that the Substantial Shareholder involved in a Business
     Combination became a Substantial Shareholder.

          (vii)  A Substantial Shareholder shall be deemed to have acquired a
     share of the Voting Stock of the Corporation at the time when such
     Substantial Shareholder became the Beneficial Owner thereof.  With respect
     to the shares owned by Affiliates, Associates or other persons whose
     ownership is attributed to a Substantial Shareholder under the foregoing
     definition of Substantial Shareholder, if the price is paid by such
     Substantial Shareholder for such shares is not determinable by a majority
     of the Continuing Directors, the price so paid shall be deemed to be the
     higher of (a) the price paid upon the acquisition thereof by the Affiliate,
     Associate or other person or (b) the market price of the shares in question
     at the time when the Substantial Shareholder became the Beneficial Owner
     thereof.

                                       7
<PAGE>
 
          (viii)  The terms "Highest Per Share Price" and "Highest Equivalent
     Price" as used in this paragraph 4 of Article VII shall mean the highest
     price that can be determined to have been paid at any time by the
     Substantial Shareholder for any share or shares of that class of capital
     stock.  If there is more than one class of capital stock of the Corporation
     issued and outstanding, the Highest Equivalent Price shall mean with
     respect to each class and series of capital stock of the Corporation the
     amount determined by a majority of the Continuing Directors, on whatever
     basis they believe is appropriate, to be the highest per share price
     equivalent to the highest price that can be determined to have been paid at
     any time by the Substantial Shareholder for any share or shares of any
     class or series of capital stock of the Corporation. In determining the
     Highest Per Share Price and Highest Equivalent Price, all purchases by the
     Substantial Shareholder shall be taken into account regardless of whether
     the shares were purchased before or after the Substantial Shareholder
     became a Substantial Shareholder.  The Highest Per Share Price and the
     Highest Equivalent Price shall include any brokerage commissions, transfer
     taxes and soliciting dealers' fees paid by the Substantial Shareholder with
     respect to the shares of capital stock of the Corporation acquired by the
     Substantial Shareholder.  In the case of any Business Combination with a
     Substantial Shareholder, the Continuing Directors shall determine the
     Highest Per Share Price or the Highest Equivalent Price for each class and
     series of the capital stock of the Corporation.

     4.03 The provisions set forth in this paragraph 4 of Article VII may not be
amended, altered, changed or repealed in any respect unless such action is
approved by the affirmative vote of the holders of not less than seventy-five
percent (75%) of the outstanding shares of Voting Stock (as defined in this
Article VII) of the Corporation at a meeting of the shareholders duly called for
the consideration of such amendment, alteration, change or repeal; provided,
however, that if there is a Substantial Shareholder (as defined in this Article
VII), such action must also be approved by the affirmative vote of the holders
of not less than seventy-five percent (75%) of the outstanding shares of Voting
Stock held by the shareholders other than the Substantial Shareholder.

                                 ARTICLE VIII.

     The power to alter, amend or repeal the Corporation's bylaws, and to adopt
new bylaws, is hereby vested in the Board of Directors, subject, however, to
repeal or change by the affirmative vote of the holders of seventy-five percent
(75%) of 

                                       8
<PAGE>
 
the outstanding shares entitled to vote thereon.

                                  ARTICLE IX.

     The Corporation shall indemnify, to the fullest extent permitted by law,
any person who was, is, or is threatened to be made a named defendant or
respondent in any threatened, pending, or completed action, suit, or proceeding,
whether civil, criminal, administrative, arbitrative, or investigative, any
appeal in such action, suit, or proceeding, and any inquiry or investigation
that could lead to such an action, suit, or proceeding, by reason of the fact
that such person is or was a director or officer of the Corporation, or, while
such person was a director of the Corporation, is or was serving at the request
of the Corporation as a director, officer, partner, venturer, proprietor,
trustee, employee, agent, or similar functionary of another corporation,
partnership, joint venture, sole proprietorship, trust, employee benefit plan,
or other enterprise, against judgments, penalties (including excise and similar
taxes), fines, settlements, and reasonable expenses (including attorney's fees)
actually incurred by such person in connection with such action, suit, or
proceeding.  In addition to the foregoing, the Corporation shall, upon request
of any such person described above and to the fullest extent permitted by law,
pay or reimburse the reasonable expenses incurred by such person in any action,
suit, or proceeding described above in advance of the final disposition of such
action, suit, or proceeding.
 
                                   ARTICLE X.

     No director of the Corporation shall be personally liable to the
Corporation or its shareholders for monetary damages for an act or omission in
such director's capacity as a director, except for liability for (i) a breach of
the director's duty of loyalty to the Corporation or its shareholders; (ii) an
act or omission not in good faith or that involves intentional misconduct or a
knowing violation of the law; (iii) a transaction from which the director
received an improper benefit, whether or not the benefit resulted from an action
taken within the scope of the director's office; (iv) an act or omission for
which the liability of a director is expressly provided by statute; or (v) an
act related to an unlawful stock repurchase or payment of a dividend.  If the
laws of the State of Texas or the Commonwealth of Virginia are hereafter amended
to authorize corporate action further eliminating or limiting the personal
liability of a director of the Corporation, then the liability of a director of
the Corporation shall thereupon automatically be eliminated or limited to the
fullest extent permitted by the laws of the State of Texas and the Commonwealth
of Virginia.  Any repeal or modification of this Article X by the shareholders
of the Corporation shall not adversely affect any right or protection of a
director existing at the time of such repeal or modification 

                                       9
<PAGE>
 
with respect to such events or circumstances occurring or existing prior to such
time.

                                       10

<PAGE>
 
                                                                     EXHIBIT 3.2

                                     BYLAWS
                                       OF
                            ATMOS ENERGY CORPORATION

                 (Amended and Restated as of November 12, 1997)

                                ----- *** -----
                                        

                                   ARTICLE I

                                    OFFICES

    1.01  Registered Office.  The registered office in the State of Texas shall
be located in the City of Dallas, County of Dallas, State of Texas.  The
registered office in the Commonwealth of Virginia shall be located in the City
of Richmond, Commonwealth of Virginia.

    1.02  Other Offices.  The corporation also may have offices at such other
places both within and without the State of Texas or the Commonwealth of
Virginia as the Board of Directors may from time to time determine or as the
business of the corporation may require.

                                   ARTICLE II

                            MEETINGS OF SHAREHOLDERS

    2.01  Place of Meetings.  All meetings of shareholders for the election of
directors or for any other proper purposes shall be held at such place within or
without the State of Texas or the Commonwealth of Virginia as the Board of
Directors may from time to time designate, as stated in the notice of such
meeting or a duly executed waiver of notice thereof.

    2.02  Annual Meeting.  An annual meeting of shareholders shall be held at
11:00 a.m. on the second Wednesday of February of each year commencing in 1989,
unless such day is a legal holiday, in which case such meeting shall be held at
the specified time on the next full business day thereafter which is not a legal
holiday, or on such day and at such time as shall be determined by the Board of
Directors.  At such meeting the shareholders entitled to vote thereat shall
elect a Board of Directors and may transact such other business as may properly
be brought before the meeting.

    2.03  Special Meetings.  Special meetings of shareholders may be called by
the Chairman of the Board of Directors, the President, a majority of the Board
of Directors, or as otherwise provided in the Articles of Incorporation, the
Texas Business Corporation Act, or the Virginia Stock Corporation Act.

    2.04  Notice of Annual or of Special Meeting.  Written or printed notice
stating the place, day and hour of the meeting and, in case of a special
meeting, the purpose or purposes for 
<PAGE>
 
which the meeting is called, shall be delivered not less than ten (10) nor more
than sixty (60) days before the date of the meeting. However, notice of a
meeting of shareholders to act upon an amendment of the Articles of
Incorporation, a plan of merger or share exchange, a proposed sale of all or
substantially all of the assets, or the dissolution of the corporation shall be
given not less than twenty-five (25) nor more than sixty (60) days before the
meeting date. Notice may be given either personally or by mail, by or at the
direction of the Chairman of the Board, President, Secretary, or the officer or
person calling the meeting to each shareholder of record entitled to vote at
such meeting. If mailed, such notice shall be deemed to be delivered when
deposited in the United States mail, addressed to the shareholder at his address
as it appears on the stock transfer books of the corporation, with postage
thereon prepaid.

    2.05  Notice of Shareholder Proposals.  At any annual meeting, only such
business shall be conducted as shall have been brought before the annual meeting
by or at the direction of the Board of Directors or by any shareholder who
complies with the procedures set forth in this Section 2.05.

    Except as otherwise provided by the Articles of Incorporation, the only
business which shall be conducted at any annual meeting of the shareholders
shall (i) have been specified in the written notice of the meeting (or any
supplement thereto) given as provided in Section 2.04 of the Bylaws, (ii) be
brought before the meeting at the direction of the Board of Directors or the
Chairman of the meeting or (iii) have been specified in a written notice (a
"Shareholder Proposal Notice") given to the corporation, in accordance with all
of the following requirements, by or on behalf of any shareholder who shall have
been a shareholder of record on the record date for such meeting and who shall
continue to be entitled to vote thereat.  Each Shareholder Proposal Notice must
be delivered or mailed by first class United States mail, postage prepaid, to
and received by, the Secretary of the corporation, at the principal executive
offices of the corporation, not less than sixty (60) days nor more than eighty-
five (85) days prior to the annual meeting; provided, however, that if less than
seventy-five (75) days' notice or prior public disclosure of the date of the
annual meeting is given or made to shareholders, notice by the shareholder to be
timely must be received by the Secretary of the corporation not later than the
close of business on the tenth (10/th/) day following the day on which such
notice of the date of the annual meeting was mailed or such public disclosure
was made. To be included in the corporation's proxy statement for mailing to all
shareholders, a Shareholder Proposal Notice must be delivered or mailed by first
class United States mail, postage prepaid, to and received by, the Secretary of
the corporation, at the principal executive offices of the corporation, not less
than one hundred twenty (120) days in advance of the date of the corporation's
release of its proxy statement to shareholders in connection with the previous
year's annual meeting of 

                                       2
<PAGE>
 
shareholders.

    Each Shareholder Proposal Notice shall set forth: (i) a description of each
item of business proposed to be brought before the meeting; (ii) the name and
address of the shareholder proposing to bring such item of business before the
meeting; (iii) the class and number of shares of stock held of record, owned
beneficially and represented by proxy by such shareholder as of the record date
for the meeting (if such date shall then have been made publicly available) and
as of the date of such Shareholder Proposal Notice; and (iv) all other
information which would be required to be included in a proxy statement filed
with the Securities and Exchange Commission if, with respect to any such item of
business, such shareholder were a participant in a solicitation subject to
Section 14 of the Securities Exchange Act of 1934.  No business shall be brought
before any meeting of shareholders of the corporation otherwise than as provided
in this paragraph or the Articles of Incorporation.

    2.06  Business at Special Meeting.  The business transacted at any special
meeting of shareholders shall be limited to the purposes stated in the notice
thereof.

    2.07  Quorum of Shareholders.  Unless otherwise provided in the Articles of
Incorporation, the holders of a majority of the shares entitled to vote,
represented in person or by proxy, shall constitute a quorum at a meeting of
shareholders.  If, however, a quorum shall not be present or represented at any
meeting of the shareholders, the shareholders present in person or represented
by proxy shall have the power to adjourn the meeting from time to time, without
notice other than announcement at the meeting, until a quorum shall be present
or represented.  If the date of the adjourned meeting is at least one hundred
twenty (120) days after the date of the original meeting, notice of such
adjourned meeting must be provided to shareholders as of the new record date.
At such adjourned meeting at which a quorum shall be present or represented, any
business may be transacted which might have been transacted at the meeting as
originally notified.

    2.08  Act of Shareholders' Meeting.  With respect to any matter, other than
a matter for which the affirmative vote of the holders of a specified portion of
the shares may be required by the Texas Business Corporation Act or the Virginia
Stock Corporation Act, the affirmative vote of the holders of a majority of the
shares entitled to vote on a matter and represented in person or by proxy at a
meeting at which a quorum is present, shall be the act of the shareholders,
unless the vote of a greater number is required by law or the Articles of
Incorporation

    2.09  Voting of Shares.  Each outstanding share, regardless of class, shall
be entitled to one vote on each matter submitted to a vote at a meeting of
shareholders, except to the extent that 

                                       3
<PAGE>
 
the voting rights of the shares of any class are limited or denied by the
Articles of Incorporation or are otherwise provided by law. Cumulative voting in
the election of directors or otherwise is expressly prohibited by the Articles
of Incorporation. At each election for directors, every shareholder entitled to
vote at such election shall have the right to vote, in person or by proxy, the
number of shares owned by him for as many persons as there are directors to be
elected and for whose election he has the right to vote.

    2.10  Proxies.  At any meeting of the shareholders, each shareholder having
the right to vote shall be entitled to vote either in person or by proxy
executed in writing by the shareholder or by his duly authorized attorney-in-
fact.  Any such proxy shall be delivered to the secretary of such meeting at or
prior to the time designated by the chairman of the meeting or in the order of
business for so delivering such proxies.  No proxy shall be valid after eleven
(11) months from the date of its execution unless otherwise provided in the
proxy.  Each proxy shall be revocable unless expressly provided therein to be
irrevocable and unless otherwise made irrevocable by law.  Unless required by
statute or determined by the chairman of the meeting to be advisable, the vote
on any question need not be by ballot. On a vote by ballot, each ballot shall be
signed by the shareholder voting or by such shareholder's proxy, if there be
such proxy.

    2.11  Voting List.  The officer or agent having charge of the stock transfer
books for shares of the corporation shall make, at least ten (10) days before
each meeting of shareholders, a complete list of the shareholders entitled to
vote at such meeting or any adjournment thereof, arranged in alphabetical order,
with the address of and number of shares held by each shareholder, which list,
for a period of ten (10) days prior to such meeting, shall be kept on file at
the registered office of the corporation and shall be subject to the inspection
by any shareholder at any time during usual business hours.  Such list shall
also be produced and kept open at the time and place of the meeting and shall be
subject to the inspection of any shareholder during the whole time of the
meeting.  The original stock transfer books shall be prima facie evidence as to
who are the shareholders entitled to examine such list or transfer books or to
vote at any such meeting of shareholders.

    2.12  Order of Business.  The order of business of each meeting of the
shareholders of the corporation shall be determined by the chairman of the
meeting.  The chairman of the meeting shall have the right and authority to
prescribe such rules, regulations, and procedures and to do all such acts and
things as are necessary or desirable for the conduct of the meeting, including,
without limitation, the establishment of the procedures for the dismissal of
business not properly presented, maintenance of order and safety, limitations on
the time allotted to questions or comments on the affairs of the corporation,

                                       4
<PAGE>
 
restrictions on entry to such meetings after the time prescribed for
commencement thereof, and the opening and closing of the voting polls.

    2.13  Action by Written Consent without a Meeting.  Any action required or
permitted by law, the Articles of Incorporation or these Bylaws to be taken at a
meeting of the shareholders may be taken without a meeting if a consent in
writing, setting forth the action so taken, is signed by all of the shareholders
entitled to vote with respect to the subject matter thereof.  Such consent shall
have the same force and effect as a unanimous vote of shareholders.

                                  ARTICLE III

                               BOARD OF DIRECTORS

    3.01  Powers.  The business and affairs of the corporation shall be managed
under the direction of its Board of Directors which may exercise all such powers
of the corporation and do all such lawful acts and things as are not by law, the
Articles of Incorporation or these Bylaws directed or required to be exercised
and done by the shareholders.

    3.02  Number of Directors.  The number of directors of the corporation
constituting the Board of Directors shall be not less than three (3) or more
than fifteen (15).  The number of directors shall be determined in accordance
with these Bylaws by resolution of the Board of Directors or of the
shareholders, but no decrease shall have the effect of shortening the term of
any incumbent director.  Any change in the range for the size of the Board of
Directors or a change from a variable-range to a fixed size Board or vice versa
may be effected following shareholder approval.

     3.03  Election and Term.  The directors shall be divided into three
classes, designated Class I, Class II and Class III. Each class shall consist,
as nearly as may be possible, of one-third of the total number of directors
constituting the entire Board of Directors.  At the 1989 annual meeting of
shareholders, Class I directors shall be elected for a one-year term, Class II
directors for a two-year term and Class III directors for a three-year term.  At
each succeeding annual meeting of shareholders beginning in 1990, successors to
the class of directors whose term expires at that annual meeting shall be
elected for a three-year term.  Directors shall be elected by a majority vote of
the outstanding shares entitled to vote in the election of directors and
represented in person or by proxy at a meeting of shareholders at which a quorum
is present.  If the number of directors is changed, any increase or decrease
shall be apportioned among the classes so as to maintain the number of directors
in each class as nearly equal as possible, and any additional director of any
class elected to fill a vacancy resulting from an increase in such class shall
hold office for a 

                                       5
<PAGE>
 
term that shall coincide with the remaining term of that class, but in no case
will a decrease in the number of directors shorten the term of any incumbent
director. A director shall hold office until the annual meeting for the year in
which his term expires and until his successor shall be elected and shall
qualify, subject, however, to prior death, resignation, retirement,
disqualification or removal from office.

    3.04  Nominations of Directors.  Nominations for election to the Board of
Directors of the corporation at a meeting of shareholders may be made by the
Board of Directors, or by any shareholder of the corporation entitled to vote
for the election of directors at such meeting.  Such nominations, other than
those made by the Board of Directors, shall be made by notice in writing
delivered or mailed by first class United States mail, postage prepaid, to and
received by the Secretary of the corporation, at the principal executive offices
of the corporation, not less than sixty (60) days nor more than eighty-five (85)
days prior to any meeting of shareholders called for the election of directors;
provided, however, that if less than seventy-five (75) days' notice or prior
public disclosure of the date of the meeting is given or made to shareholders,
such nomination shall have been received by the Secretary of the corporation not
later than the close of business on the tenth (10/th/) day following the day on
which the notice of meeting was mailed or such public disclosure was made.  Such
notice shall set forth:  (i)  the name and address of the shareholder who
intends to make the nomination and of the person or persons to be nominated;
(ii)  the class and number of shares of stock held of record, owned beneficially
and represented by proxy by such shareholder as of the record date for the
meeting (if such date shall then have been made publicly available) and of the
date of such notice; (iii)  a representation that the shareholder is a holder of
record of stock of the corporation entitled to vote at such meeting and that the
shareholder intends to appear in person or by proxy at the meeting to nominate
the person or persons specified in the notice; (iv)  a description of all
arrangements or understandings between such shareholder and each nominee and any
other person or persons (naming such person or persons) pursuant to which the
nomination or nominations are to be made by such shareholder; (v) such other
information regarding each nominee proposed by such shareholder as would be
required to be disclosed in solicitations for proxies for election of directors
pursuant to the proxy rules of the Securities and Exchange Commission; and (vi)
the consent of each nominee to serve as a director of the corporation if so
elected.  The presiding officer of the meeting may refuse to acknowledge the
nomination of any person not made in compliance with the foregoing procedure.

    3.05  Vacancies.  Any vacancy occurring in the Board of Directors may be
filled by the affirmative vote of a majority of the remaining directors although
less than a quorum of the Board of Directors.   The term of office of a director
elected to fill a vacancy shall continue only until the next succeeding election

                                       6
<PAGE>
 
of one or more directors by the shareholders.  Any directorship to be filled by
reason of an increase in the number of directors may be filled by election at an
annual meeting or special meeting of shareholders called for that purpose or may
be filled by the Board of Directors for a term of office continuing only until
the next election of one or more directors by the shareholders; provided,
however, that the Board of Directors may not fill more than two such
directorships during the period between any two successive annual meetings of
shareholders.

    3.06  Resignation and Removal.  Any director may resign at any time upon
giving written notice to the Board of Directors, Chairman of the Board,
President or Secretary of the corporation. No director shall be removed during
his term of office except for cause and by the affirmative vote of the holders
of seventy-five percent (75%) of the shares then entitled to vote at an election
of directors.   A director may be removed by the shareholders only at a meeting
called for the purpose of removing him.  The notice for such a meeting shall
state that the purpose, or one of the purposes of the meeting, is the removal of
the director.

    3.07  Compensation of Directors.  As specifically prescribed from time to
time by resolution of the Board of Directors, the directors of the corporation
may be paid their expenses of attendance at each meeting of the Board and may be
paid a fixed sum for attendance at each meeting of the Board or a stated salary
in their capacity as directors.  This provision shall not preclude any director
from serving the corporation in any other capacity and receiving compensation
therefor.  Members of special or standing committees may be allowed like
compensation for attending committee meetings.

                                   ARTICLE IV

                             MEETINGS OF THE BOARD

    4.01  First Meeting.  The first meeting of each newly elected Board of
Directors shall be held without further notice immediately following and at the
same place as the annual meeting of shareholders unless, by unanimous consent of
the directors then elected and serving, such time or place shall be changed.

    4.02  Regular Meeting.  Regular meetings of the Board of Directors may be
held with or without notice at such time and at such place either within or
without the State of Texas or the Commonwealth of Virginia as from time to time
shall be prescribed by resolution of the Board of Directors.

    4.03  Special Meetings.  Special meetings of the Board of Directors may be
called by the Chairman of the Board of Directors or the President, and shall be
called by the Chairman of the Board of Directors, the President or the Secretary
on the written request of two directors.  Written notice of special meetings of
the Board of Directors shall be given to each director at least 

                                       7
<PAGE>
 
twenty-four (24) hours before the time of the meeting.

    4.04  Business at Regular or Special Meeting.  Neither the business to be
transacted at, nor the purpose of, any regular or special meeting of the Board
of Directors need be specified in the notice or waiver of notice of such
meeting.

    4.05  Quorum of Directors.  A majority of the Board of Directors shall
constitute a quorum for the transaction of business, unless a greater number is
required by law or the Articles of Incorporation.  If a quorum shall not be
present at any meeting of the Board of Directors, the directors present thereat
may adjourn the meeting from time to time, without notice other than
announcement of the meeting, until a quorum shall be present.

    4.06  Act of Directors' Meeting.  The act of a majority of the directors
present at a meeting at which a quorum is present shall be the act of the Board
of Directors unless the act of a greater number is required by law, the Articles
of Incorporation, or these Bylaws.

    4.07  Action by Written Consent without a Meeting.  Any action required or
permitted by law, the Articles of Incorporation or these Bylaws to be taken at a
meeting of the Board of Directors or any committee thereof may be taken without
a meeting if a consent in writing, setting forth the action so taken, is signed
by all members of the Board of Directors or committee, as the case may be.  Such
consent shall have the same force and effect as a unanimous vote at such
meeting.  Action by written consent is effective when the last director signs
the consent unless the consent specifies a different effective date, in which
event the action taken is effective as of the date specified therein, provided
the consent states the date of execution of each director.

                                   ARTICLE V

                                   COMMITTEES

    The Board of Directors, by resolution adopted by a majority of the full
Board of Directors, may designate from among its members an executive committee
and one or more other committees, each of which shall be comprised of two or
more members and, to the extent provided in such resolution or in the Articles
of Incorporation or in these Bylaws, shall have and may exercise all of the
authority of the Board of Directors, except that no such committee shall have
the authority of the Board of Directors in reference to (i) amending the
Articles of Incorporation, (ii) proposing to the shareholders a reduction in the
stated capital of the corporation, (iii) approving a plan of merger, share
exchange or conversion of the corporation, (iv) recommending to the shareholders
the sale, lease, or exchange of all or substantially all of the property and
assets of the corporation 

                                       8
<PAGE>
 
otherwise than in the usual and regular course of its business, (v) recommending
to the shareholders a voluntary dissolution of the corporation or a revocation
thereof, (vi) amending, altering, or repealing the Bylaws of the corporation or
adopting new Bylaws for the corporation, filling vacancies in the Board of
Directors or filling vacancies in or designating alternate members of any
committee, (vii) filling any directorship to be filled by reason of an increase
in the number of directors, (viii) electing or removing officers, members of the
Board of Directors or members of any committee, (ix) fixing the compensation of
any member of a committee, (x) altering or repealing any resolution of the Board
of Directors which by its terms provides that it shall not be so amendable or
repealable or (xi) approving, authorizing or recommending to shareholders any
other action that the Virginia Stock Corporation Act requires to be approved by
shareholders. No committee shall have the power or authority to declare a
dividend, authorize or approve any other type of distribution to shareholders,
or to authorize the issuance, sale or contract for sale of shares of the
orporation. The Board of Directors shall fill vacancies in the membership of
each committee at a regular or special meeting of the Board. Each committee
shall keep regular minutes of its proceedings and report the same to the Board
when required. The designation of each such committee and the delegation thereto
of authority shall not operate to relieve the Board of Directors, or any member
thereof, of any responsibility imposed upon it or him by law.

                                   ARTICLE VI

                                    NOTICES

    6.01  Methods of Giving Notice.  Whenever any notice is required to be given
to any shareholder or director under the provisions of any statute, the Articles
of Incorporation or these Bylaws, it shall be given in writing and delivered
personally or mailed to such shareholder or director at such address as appears
on the books of the corporation, and such notice shall be deemed to be given at
the time when the same shall be deposited in the United States mail with
sufficient postage thereon prepaid. Notice to directors may also be given by
telegram or electronic communication including facsimile transmission, and
notice given by such means shall be deemed given at the time it is delivered to
the telegraph office or transmitted by means of electronic communication.

    6.02  Waiver of Notice.  Whenever any notice is required to be given to any
shareholder or director under the provisions of any law, the Articles of
Incorporation or these Bylaws, a waiver thereof in writing signed by the person
or persons entitled to said notice, whether before or after the time stated
therein, shall be deemed equivalent to the giving of such notice.

    6.03  Attendance as Waiver.  Attendance of a director at or participation in
a meeting shall constitute a waiver of notice of 

                                       9
<PAGE>
 
such meeting, unless such director at the beginning of the meeting or promptly
upon his arrival, objects to holding the meeting or to the transaction of any
business at such meeting and who does not thereafter vote for or assent to
action taken at the meeting. Attendance of a shareholder at a meeting of
shareholders shall constitute a waiver of objection to lack of notice or
defective notice of such meeting, unless such shareholder at the beginning of
the meeting objects to holding the meeting or to transacting business at such
meeting.

                                  ARTICLE VII

                       ACTION WITHOUT A MEETING BY USE OF
                              CONFERENCE TELEPHONE
                      OR SIMILAR COMMUNICATIONS EQUIPMENT

    Subject to the provisions requiring or permitting notice of meeting, unless
otherwise restricted by the Articles of Incorporation or these Bylaws,
shareholders, members of the Board of Directors or members of any committee
designated by such Board may participate in and hold a meeting of such
shareholders, Board or committee by means of conference telephone or similar
communications equipment by means of which all persons participating in the
meeting can hear each other, and participation in such a meeting shall
constitute presence in person at such meeting, except where a person
participates in the meeting for the express purpose of objecting to the
transaction of any business, and in the case of a director, who does not
thereafter vote for or assent to action taken at the meeting.

                                  ARTICLE VIII

                                    OFFICERS

    8.01  Executive Officers.  The officers of the corporation shall consist of
a President, one or more Vice Presidents, a Secretary, and a Treasurer, and may
also include the Chairman of the Board if so designated as an officer by the
Board of Directors and such other officers as are provided for in Section 8.03
of this Article.  Any Vice President of the corporation may, by the addition of
a number or a word or words before or after the title "Vice President", be
designated "Senior Executive", "Executive", "Senior", "Trust", "Second" or
"Assistant" Vice President.  Each officer of the corporation shall be elected or
appointed by the Board of Directors as provided in Sections 8.02 and 8.03 of
this Article.  Any two or more offices may be held by the same person.

    8.02  Election and Qualification.  The Board of Directors, at its first
meeting after each annual meeting of shareholders, shall choose a President, one
or more Vice Presidents, a Secretary, and a Treasurer, none of whom need be a
member of the Board.  The Board also may elect one or more Assistant Secretaries
and Assistant Treasurers.

                                       10
<PAGE>
 
    8.03  Other Officers and Agents.  The Board of Directors may elect or
appoint such other officers, assistant officers and agents as may be necessary,
who shall hold their offices for such terms and shall exercise such powers and
perform such duties as shall be determined from time to time by the Board.

    8.04  Compensation.  The compensation of all officers and agents of the
corporation shall be fixed by resolution of the Board of Directors.

    8.05  Term, Removal and Vacancies.  Each officer of the corporation shall
hold office until his successor is chosen and qualified or until his death,
resignation or removal.  Any officer may resign at any time upon giving written
notice to the corporation which resignation will not affect the corporation's
contract rights, if any, with such officer.  Any officer or agent or member of a
committee elected or appointed by the Board of Directors may be removed by the
Board of Directors whenever in its judgment the best interest of the corporation
will be served thereby, but such removal shall be without prejudice to such
removed person's contract rights, if any, with the corporation. Election or
appointment of an officer or agent or member of a committee shall not of itself
create contract rights.  Any vacancy occurring in any office of the corporation
by death, resignation, removal or otherwise shall be filled by the Board of
Directors.

    8.06  Chief Executive Officer.  In the event such positions are held by
different individuals, the Board of Directors shall designate whether the
Chairman of the Board or the President shall be the chief executive officer of
the corporation.  The chief executive officer shall have all of the powers and
duties as usually pertain to such position, including the power to make and sign
contracts and agreements in the name of and on behalf of the corporation and all
other powers and duties granted by these Bylaws to the President of the
corporation.  In the event the Chairman of the Board is designated the chief
executive officer of the corporation, the Chairman of the Board shall have
supervisory powers over the President, all other officers of the corporation,
and the business activities of the corporation.

    8.07  President.  The President shall be the chief operating officer of the
corporation and shall have such powers and duties as usually pertain to such
office, except as the same may be modified by the Board of Directors.  The
President shall have general powers of oversight, supervision and management of
the business and affairs of the corporation, shall see that all orders and
resolutions of the Board of Directors are carried into effect, and shall have
the power to make and sign contracts and agreements in the name and on behalf of
the corporation and to do or perform all other acts incident to the office of
President or that are authorized or required by law.  In the event that
different persons hold such positions, the President shall preside at meetings
of the shareholders in the absence of the 

                                       11
<PAGE>
 
Chairman of the Board. If the President is also a member of the Board, he shall
be ex-officio a member of all committees of the Board and shall preside, in the
absence of the Chairman of the Board, at meetings of the Board, if the President
is not also serving as the Chairman of the Board at that time.

    8.08  Vice President.  Unless otherwise determined by the Board of
Directors, one of the Vice Presidents shall, in the absence or disability of the
President, perform the duties and exercise the powers of the President.  The
various Vice Presidents shall perform such other duties and have such other
powers as the Board of Directors shall prescribe.

    8.09  Secretary.  The Secretary shall attend all meetings of the Board of
Directors and of the shareholders, record all the proceedings of the meetings of
the Board of Directors and of the shareholders in a book to be kept for that
purpose and shall perform like duties for the standing committees when required.
He shall give, or cause to be given, notice of all meetings of the shareholders
as may be prescribed by the Board of Directors, Chairman of the Board, or the
President.  He shall keep in safe custody the seal of the corporation, and, when
authorized by the Board of Directors, affix the same to any instrument requiring
it, and, when so affixed, it shall be attested by his signature or by the
signature of the Treasurer or an Assistant Secretary.

    8.10  Assistant Secretaries.  An Assistant Secretary, unless otherwise
determined by the Board of Directors, shall, in the absence or disability of the
Secretary, perform the duties and exercise the powers of the Secretary.  They
shall perform such other duties and have such other powers as the Board of
Directors may from time to time prescribe.

    8.11  Treasurer.  The Treasurer shall have the custody of the corporate
funds and securities, shall keep full and accurate accounts of receipts and
disbursements in books belonging to the corporation and shall deposit all moneys
and other valuable effects in the name and to the credit of the corporation in
such depositories as may be designated by the Board of Directors.  He shall
disburse the funds of the corporation as may be ordered by the Board of
Directors, taking proper vouchers for such disbursements, and shall render to
the Chairman of the Board (if he is the chief executive officer), President, and
the Board of Directors at its regular meetings, or when the Board of Directors
so requires, an account of all his transactions as Treasurer, and of the
financial condition of the corporation.

    8.12  Assistant Treasurers.  An Assistant Treasurer, unless otherwise
determined by the Board of Directors, shall, in the absence or disability of the
Treasurer, perform the duties and exercise the powers of the Treasurer.  They
shall perform such other duties and have such other powers as the Board of
Directors from time to time may prescribe.

                                       12
<PAGE>
 
    8.13  Officer's Bond.  If required by the Board of Directors, any officer so
required shall give the corporation a bond (which shall be renewed as the Board
may require) in such sum and with such surety or sureties as shall be
satisfactory to the Board of Directors for the faithful performance of the
duties of his office and for the restoration to the corporation, in case of his
death, resignation, retirement or removal from office, of any and all books,
papers, vouchers, money and other property of whatever kind in his possession or
under his control belonging to the corporation.

                                   ARTICLE IX

                   INDEMNIFICATION OF OFFICERS AND DIRECTORS

    Subject to any limitation which may be contained in the Articles of
Incorporation, the corporation shall indemnify, to the fullest extent permitted
by law, any person who was, is, or is threatened to be made a named defendant or
respondent in any threatened, pending, or completed action, suit, or proceeding,
whether civil, criminal, administrative, arbitrative, or investigative, any
appeal in such action, suit, or proceeding, and any inquiry or investigation
that could lead to such an action, suit or proceeding, by reason of the fact
that such person is or was a director or officer of the corporation, or, such
person who, while a director or officer of the corporation, is or was serving at
the request of the corporation as a director, officer, partner, venturer,
proprietor, trustee, employee, agent, or similar functionary of another
corporation, partnership, joint venture, sole proprietorship, trust, employee
benefit plan, or other enterprise, against judgments, penalties (including
excise and similar taxes), fines, settlements, and reasonable expenses
(including attorney's fees) actually incurred by such person in connection with
such action, suit, or proceeding.  In addition to the foregoing, the corporation
shall, upon request of any such person described above and to the fullest extent
permitted by law, pay or reimburse the reasonable expenses incurred by such
person in any action, suit, or proceeding described above in advance of the
final disposition of such action, suit, or proceeding.

                                   ARTICLE X

                            CERTIFICATES FOR SHARES

    10.01 Certificates Representing Shares. The corporation shall deliver
certificates representing all shares to which shareholders are entitled. Such
certificates shall be numbered and shall be entered in the books of the
corporation as they are issued, and shall be signed by the Chairman of the
Board, President, or a Vice President, and the Secretary or an Assistant
Secretary of the corporation, and may be sealed with the seal of the corporation
or a facsimile thereof. The signatures of the Chairman of the Board, President,
or Vice President, and the

                                       13
<PAGE>
 
Secretary or Assistant Secretary, upon a certificate may be facsimiles, if the
certificate is countersigned by a transfer agent or registered by a registrar,
either of which is other than the corporation itself or an employee of the
corporation. In case any officer who has signed or whose facsimile signature has
been placed upon such certificate shall have ceased to be such officer before
such certificate is issued, it may be issued by the corporation with the same
effect as if he were such officer at the date of its issuance. If the
corporation is authorized to issue shares of more than one class, each
certificate representing shares issued by the corporation (1) shall
conspicuously set forth on the face or back of the certificate a full statement
of (a) all of the designations, preferences, limitations and relative rights of
the shares of each class authorized to be issued and, (b) if the corporation is
authorized to issue shares of any preferred or special class in series, the
variations in the relative rights and preferences of the shares of each such
series to the extent the same have been fixed and determined and the authority
of the Board of Directors to fix and determine the relative rights and
preferences of subsequent series; or (2) shall conspicuously state on the face
or back of the certificate that (a) such a statement is set forth in the
Articles of Incorporation on file in the office of the Secretary of State of
Texas and the State Corporation Commission of Virginia and (b) the corporaton
will furnish a copy of such statement to the record holder of the certificate
without charge on written request to the corporation at its principal place of
business or registered office. If the corporation has by its Articles of
Incorporation limited or denied the preemptive right of shareholders to acquire
unissued or treasury shares of the corporation, each certificate representing
shares issued by such corporation (1) shall conspicuously set forth on the face
or back of the certificate a full statement of the limitation or denial of
preemptive rights contained in the Articles of Incorporation, or (2) shall
conspicuously state on the face or back of the certificate that (a) such a
statement is set forth in the Articles of Incorporation on file in the office of
the Secretary of State of Texas and the State Corporation Commission of Virginia
and (b) the corporation will furnish a copy of such statement to the record
holder of the certificate without charge on request to the corporation at its
principal place of business or registered office. Each certificate representing
shares shall state upon the face thereof that the corporation is organized under
the laws of the State of Texas and the Commonwealth of Virginia, the name of the
person to whom issued, the number and class of shares and the designation of the
series, if any, which such certificate represents and the par value of each
share represented by such certificate or a statement that the shares are without
par value. No certificate shall be issued for any share until the consideration
therefor, fixed as provided by law, has been fully paid.

    10.02  Restrictions on Transfer of Shares.  If any restriction on the
transfer, or registration of the transfer, of 

                                       14
<PAGE>
 
shares shall be imposed or agreed to by the corporation, as permitted by law,
the Articles of Incorporation or these Bylaws, each certificate representing
shares so restricted (1) shall conspicuously set forth a full or summary
statement of the restrictions on the face of the certificate, or (2) shall set
forth such statement on the back of the certificate and conspicuously refer to
the same on the face of the certificate, or (3) shall conspicuously state on the
face or back of the certificate that such restrictions exist pursuant to a
specified document and (a) that the corporation will furnish to the record
holder of the certificate without charge upon written request to the corporation
at its principal place of business or registered office a copy of the specified
document, or (b) if such document is one required or permitted to be and has
been filed under applicable law, that such specified document is on file in the
Office of the Secretary of State of Texas or the State Corporation Commission of
Virginia and contains a full statement of such restrictions. Unless such
document was on file in the Office of the Secretary of State of Texas or the
State Corporation Commission of Virginia at the time of the request, as required
by applicable law, if the corporation fails within a reasonable time to furnish
the record holder of a certificate, upon such request and without charge, a copy
of the specified document, the corporation shall not be permitted thereafter to
enforce its rights under the restrictions imposed on the shares represented by
such certificate. Any restriction on the transfer, or registration of transfer,
of shares of the corporation, if reasonable and noted conspicuously on the
certificates representing such shares, may be enforced against the holder of the
restricted shares or any successor or transferee of the holder, including an
executor, administrator, trustee, guardian, or other fiduciary entrusted with
like responsiility for the person or estate of the holder. Unless noted
conspicuously on the certificates representing such shares, a restriction, even
though otherwise enforceable, is ineffective except against a person with actual
knowledge of the restriction.

    10.03  Transfer of Shares.  Upon surrender to the corporation or the
transfer agent of the corporation of a certificate for shares duly endorsed or
accompanied by proper evidence of succession, assignment or authority to
transfer, it shall be the duty of the corporation to issue a new certificate to
the person entitled thereto, cancel the old certificate, and record the
transaction upon its books.

    10.04  Lost, Stolen or Destroyed Certificates.  The Board of Directors may
direct a new certificate or certificates to be issued in place of any
certificate or certificates theretofore issued by the corporation alleged to
have been lost, stolen or destroyed upon the making of an affidavit of that fact
by the person claiming the certificate of stock to be lost, stolen or destroyed.
When authorizing such issue of a new certificate or certificates, the Board of
Directors, in its discretion and as a condition precedent to the issuance
thereof, may require the 

                                       15
<PAGE>
 
owner of such lost, stolen or destroyed certificate or certificates, or his
legal representative, to advertise the same in such manner as it shall require
and/or to give the corporation a bond in such sum as it may direct as indemnity
against any claim that may be made against the corporation with respect to the
certificate alleged to have been lost, stolen or destroyed.

    10.05  Closing of Transfer Books and Fixing Record Date. For the purpose of
determining shareholders entitled to notice of or to vote at any meeting of
shareholders or any adjournment thereof, or entitled to receive payment of any
dividend, or in order to make a determination of shareholders for any other
proper purpose, the Board of Directors may provide that the stock transfer books
shall be closed for a stated period but not to exceed, in any case, sixty (60)
days.  If the stock transfer books shall be closed for the purpose of
determining shareholders entitled to notice of or to vote at a meeting of
shareholders, such books shall be closed for at least ten (10) days immediately
preceding such meeting or such longer period as may be required by law.  In lieu
of closing the stock transfer books, the Board of Directors may fix in advance a
date as the record date for any such determination of shareholders, such date in
any case to be not more than sixty (60) days and, in case of a meeting of
shareholders, not less than ten (10) days prior to the date on which the
particular action requiring such determination of shareholders is to be taken,
except with respect to a meeting of shareholders at which the shareholders will
be asked to act on an amendment of the Articles of Incorporation, a plan of
merger or share exchange, a proposed sale of all or substantially all of the
assets or the dissolution of the corporation, not less than twenty-five (25)
days prior to the date on which the particular action requiring such
determination of shareholders is to be taken.  If the stock transfer books are
not closed and no record date is fixed for the determination of shareholders
entitled to notice of or to vote at a meeting of shareholders, or shareholders
entitled to receive payment of a dividend, the date prior to the day notice of
the meeting is mailed or the date on which the resolution of the Board of
Directors declaring such dividend is adopted, respectively, shall be the record
date for such determination of shareholders.  When a determination of
shareholders entitled to vote at any meeting of shareholders has been made as
provided in this Section 10.05, such determination shall apply to any
adjournment thereof, except where the determination has been made through the
closing of stock transfer books and the stated period of closing has expired.
However, if a meeting is adjourned to a date which is at least one hundred
twenty (120) days after the date fixed for the original meeting, the Board of
Directors shall fix a new record date and provide notice of such to
shareholders.

    10.06  Registered Shareholders.  The corporation shall be entitled to
recognize the exclusive right of a person registered on its books as the owner
of shares to receive dividends, and to vote as such owner, and shall not be
bound to recognize any 

                                       16
<PAGE>
 
equitable or other claim to or interest in such share or shares on the part of
any other person, whether or not it shall have express or other notice thereof,
except as otherwise provided by the laws of the State of Texas and the
Commonwealth of Virginia.

                                   ARTICLE XI

                               GENERAL PROVISIONS

    11.01  Dividends.  The Board of Directors from time to time may declare, and
the corporation may pay, dividends on its outstanding shares in cash, in
property, or in its own shares, except if (i) after giving effect to the
distribution, the corporation would be insolvent, (ii) the distribution would
exceed the surplus of the corporation, (iii) the payment thereof would cause the
corporation's total assets to be less than the sum of its total liabilities
based on the application of accounting practices and principles that are
reasonable under the circumstances, (iv) the payment thereof would cause the
corporation to be unable to pay its debts as they become due in the usual course
of business, or (v) the declaration or payment thereof would be contrary to any
restrictions contained in the Articles of Incorporation.  The corporation may
make a distribution of its own shares to shareholders, as allowed by applicable
law.  Such dividends may be declared at any regular or special meeting of the
Board, and the declaration and payment thereof shall be subject to all
applicable provisions of law, the Articles of Incorporation and these Bylaws.

    11.02 Reserves.  Before payment of any dividend, there may be set aside out
of any funds of the corporation available for dividends such sum or sums as the
directors from time to time, in their absolute discretion, deem proper as a
reserve fund to meet contingencies, or for equalizing dividends, or for
repairing or maintaining any property of the corporation, or for such other
purpose as the directors shall deem conducive to the interest of the
corporation, and the directors may modify or abolish any such reserve in the
manner in which it was created.

    11.03  Reports.  The Board of Directors shall, when requested by the holders
of at least a majority of the outstanding shares of the corporation, present
full and clear written reports, not more often than quarterly, of the amount of
business and the financial condition of the corporation.

    11.04  Checks.  All checks or demands for money and notes of the corporation
shall be signed by such officer or officers or such other person or persons as
the Board of Directors from time to time may designate.

    11.05  Fiscal Year.  The fiscal year of the corporation shall be fixed by
resolution of the Board of Directors.

    11.06  Seal.  The corporation may have a corporate seal and, 

                                       17
<PAGE>
 
if the Board of Directors adopts a corporate seal, the corporate seal shall have
inscribed thereon the name of the corporation and may be used by causing it or a
facsimile thereof to be impressed or affixed or in any other manner reproduced.

    11.07  Opt-out of Certain Provisions of Virginia Law.  The provisions of
Sections 13.1-728.1 through 13.1-728.9, "Control Share Acquisitions", of the
Virginia Stock Corporation Act shall not apply to the corporation or to
acquisitions of common stock of the corporation.
 
                                  ARTICLE XII

                                   AMENDMENTS

    The initial Bylaws of the corporation shall be adopted by the Board of
Directors.  The power to alter, amend, or repeal the Bylaws or adopt new Bylaws,
subject to repeal or change by action of the shareholders, is vested in the
Board of Directors.  Thus, these Bylaws may be altered, amended, or repealed or
new Bylaws may be adopted at any regular or special meeting of the Board of
Directors by the affirmative vote of a majority of the Board of Directors,
subject to repeal or change at any regular or special meeting of shareholders at
which a quorum is present or represented by the affirmative vote of seventy-five
percent (75%) of the shares entitled to vote at such meeting and present or
represented thereat provided notice of the proposed repeal or change is
contained in the notice of such meeting of shareholders.  The Bylaws may contain
any provision for the regulation and management of the affairs of the
corporation not inconsistent with applicable law or the Articles of
Incorporation.
 

                                       18

<PAGE>
 
                                                                 Exhibit 10.7(a)

                      Twenty-First Supplemental Indenture

                          Dated as of February 5, 1997
                                        

                                  By and Among

                           United Cities Gas Company

                                      and

                            Bank of America Illinois

                                      and

                        First Trust National Association

                                      and

                               Russell C. Bergman

                      Supplementing Indenture of Mortgage

                           Dated as of July 15, 1959
<PAGE>
 
     This Twenty-First Supplemental Indenture, dated as of February 5, 1997,
made by and among United Cities Gas Company, a corporation organized under the
laws of the State of Illinois and the Commonwealth of Virginia (hereinafter
called the "Company"), whose address is 5300 Maryland Way, Brentwood, Tennessee
37027, Bank of America Illinois, an Illinois state bank having its office at 231
South LaSalle Street, Chicago, Illinois 60697, First Trust National Association,
a national banking association having its office at One Illinois Center, 111
East Wacker Drive, Suite 3000, Chicago, Illinois 60601 (hereinafter called
"First Trust"), and Russell C. Bergman, residing in the Village of Frankfort,
Illinois.


                                   Recitals:

     The background of this Twenty-First Supplemental Indenture is:

       1. The Company heretofore executed and delivered to City National Bank
and Trust Company of Chicago and R. Emmett Hanley, as Trustees, its Indenture of
Mortgage dated as of July 15, 1959 (hereinafter sometimes referred to as the
"Original Indenture"), providing for the issuance thereunder from time to time
of First Mortgage Bonds of the Company, issuable in one or more series, and
wherein and whereby the Company did grant, convey, mortgage, warrant to, the
said Trustees, and each of them, and their respective successors and assigns,
and create a security interest in, certain property of the Company in said
Original Indenture as more particularly described therein for the security of
all First Mortgage Bonds issued and to be issued thereunder.

       2. The Company has heretofore executed and delivered twenty supplemental
indentures to the Original Indenture, designated as First through Twenty (the
Original Indenture and all supplemental indentures, including this Twenty-First
Supplemental Indenture, being herein called the "Indenture"), for the purpose of
subjecting to the lien of the Indenture certain additional property heretofore
and hereafter acquired by the Company, creating additional series of First
Mortgage Bonds, and amending and supplementing the Indenture in certain
respects.

       3. There have been issued under the Indenture various series of First
Mortgage Bonds designated as Series A through V, inclusive, of which
$115,000,000 in aggregate principal amount are outstanding as of December 31,
1996.  The bonds of Series A, B, C, D, E, F, G, H, I, J, K, L, M, O and S have
been retired as of December 31, 1996.

     4.   On September 1, 1961, City National Bank and Trust Company of Chicago
was merged with Continental Illinois National Bank and Trust Company of Chicago,
formerly known as Continental Bank, National Association, a national banking
association, which changed from a national banking association to an Illinois
state bank on June 29, 1994, and is now known as Bank of America Illinois
("BAI").  BAI and certain of its affiliates entered into 

                                       2
<PAGE>
 
a Purchase and Assumption Agreement with First Bank National Association, the
parent company of First Trust, which provided that First Bank National
Association, or an affiliate, would purchase substantially all of the Illinois
trust and agency appointments of BAI, including the appointment under the
Indenture. First Trust and BAI thereupon entered into an Instrument of Transfer
and Assignment of certain Illinois Appointments from BAI to First Trust, which
provided for the succession by First Trust of substantially all of the Illinois
trust and agency appointments of BAI, including the Indenture.

     5.   Pursuant to Section 3-3 of the Corporate Fiduciary Act of the State of
Illinois, 205 ILCS 620, (the "Act"), and the No-Objection Letter No. 95-1021
dated July 21, 1995, from the Illinois Commissioner of Banks and Trust
Companies, title under the Indenture to all estate, properties, rights, powers
and trusts under the Indenture held by the Trustee is vested by law in First
Trust provided such succession is not prohibited by the Indenture.  The sale by
BAI of its corporate trust business to First Trust resulted in automatic
succession by First Trust of the transferred accounts pursuant to the provisions
of the Act, as such succession is not prohibited by the Indenture and First
Trust is qualified and eligible to act as Trustee under the Indenture.

       6. On October 15, 1966, Ray F. Myers became individual trustee under the
Indenture as successor to R. Emmett Hanley who resigned.  On March 15, 1981, M.
J. Kruger became individual trustee under the Indenture as successor to Ray F.
Myers who resigned.  Russell C. Bergman has agreed to become the individual
trustee under the Indenture as successor to M. J. Kruger, who has resigned,
pending the appointment of a new individual trustee by First Trust.

       7. This Twenty-First Supplemental Indenture is executed, acknowledged and
recorded to give notice to all persons that all power to act as Trustee and all
right, title and interest of BAI to all estate, properties, rights, powers and
trusts under the Indenture is now vested in First Trust, and that Russell C.
Bergman has been appointed as the successor individual trustee under the
Indenture.

                                  Article One

          Section 1.01.  Appointment of First Trust as Successor Trustee. BAI
hereby confirms the appointment of First Trust as Trustee under the Indenture
and the vesting of all estate, properties, rights, powers and trusts under the
Indenture in First Trust as Trustee under the Indenture.

          Section 1.02.  Acceptance of Appointment by First Trust.  First Trust
hereby confirms its acceptance of all duties, obligations and powers as Trustee
under the Indenture and agrees to perform all duties and obligations of the
Trustee under the Indenture.

                                       3
<PAGE>
 
          Section 1.03.  Ratification of Certain Actions Taken by BAI. First
Trust hereby ratifies any and all action taken by BAI at the direction of First
Trust after the effective time of the succession by First Trust of all duties
and obligations as Trustee under the Indenture, including, but not limited to,
any and all property releases made by BAI in accordance with the terms and
provisions of the Indenture.

          Section 1.04.  Appointment of Individual Trustee.  First Trust hereby
appoints Russell C. Bergman, as Individual Trustee under the Indenture as the
successor to M. J. Kruger.

          Section 1.05.  Acceptance of Appointment by Individual Trustee.
Russell C. Bergman hereby confirms his acceptance as of February 5, 1997, of all
duties and powers as Individual Trustee under the Indenture.

     In witness whereof, said United Cities Gas Company has caused its corporate
name to be hereunto subscribed by its Senior Vice President and Treasurer and
its corporate seal to be hereunto affixed and attested by its Secretary or by an
Assistant Secretary, and said Bank of America Illinois has caused its corporate
name to be hereunto subscribed by one of its Vice Presidents and its corporate
seal to be affixed and attested by                       and said First Trust
National Association, to evidence its acceptance of the trust hereby created and
in it reposed, has caused its corporate name to be hereunto subscribed by its
           and its corporate seal to be affixed and attested by a             ,
and said Russell C. Bergman, to evidence his acceptance of the trust hereby
created and in him reposed, has hereunto subscribed his name and affixed his
seal, all as of the day and year first above written.

                                         United Cities Gas Company
[Corporate Seal]
                                         By /s/ James B. Ford
                                            -------------------------
                                           James B. Ford,
                                           Senior Vice President
                                             and Treasurer
Attest:

Shirley Hawkins, Secretary
Witnesses as to United Cities Gas Company:


                                         Bank of America Illinois,
                                         as predecessor trustee
                                         under the Indenture
[Corporate Seal]
                                         By
                                         Its
Attest:

Its

                                       4
<PAGE>
 
Witnesses as to Bank of America Illinois:


                                         First Trust National
                                         Association, as successor
                                         trustee under the
                                         Indenture
[Corporate Seal]
                                         By
Its
Attest:

Witnesses as to First Trust,National Association:


                                         Russell C. Bergman,
                                         Individual Trustee

Attest:

Witnesses to Russell C. Bergman:

                                       5
<PAGE>
 
State of Tennessee      )
                        )  SS.
County of Williamson    )

     I, Debra S. Johnson, Notary Public in and for the County and State
aforesaid, do hereby certify that on this 6th day of February, 1997, personally
appeared before me James B. Ford and Shirley Hawkins, to me personally known,
and personally known to me to be the same persons whose names are subscribed to
the foregoing instrument, who, being by me duly sworn, did say that they are
Senior Vice President and Treasurer and Secretary, respectively, of United
Cities Gas Company, a corporation organized under the laws of the State of
Illinois and the Commonwealth of Virginia, that the seal affixed to the above
and foregoing instrument is the corporate seal of said corporation and that said
instrument was signed by them and sealed and delivered on behalf of said
corporation by authority of its Board of Directors duly given, and the said
Senior Vice President and Treasurer and Secretary acknowledged said instrument
to be their free and voluntary act and deed and the free and voluntary act and
deed of said corporation for the uses and purposes therein set forth.

     In Witness Whereof, I have hereunto set my hand and official seal this 6th
day of February, 1997.

                                      /s/ Debra S. Johnson
                                     ------------------------
                                     Notary Public in and for 
                                     the County and State
                                     aforesaid
[Notarial Seal]
My commission expires:

                                       6
<PAGE>
 
State of California     )
                        )  SS.
County of San Francisco )

     I, Kay Anderson-Wiebe, a Notary Public in and for the County and State
aforesaid, do hereby certify that on this 25th day of February, 1997, personally
appeared before me M. J. Kruger and Peet Saaret, to me personally known, and
personally known to me to be the same persons whose names are subscribed to the
foregoing instrument, who being by me duly sworn, did say that they are the Vice
President and the Vice President, respectively, of Bank of America Illinois, an
Illinois state bank, that the seal affixed to the above and foregoing instrument
is the corporate seal of said association and that said instrument was signed by
them and sealed and delivered on behalf of said association by authority of its
Board of Directors duly given, and the said Vice President and Vice President
acknowledged said instrument to be their free and voluntary act and deed and the
free and voluntary act and deed of said association for the uses and purposes
therein set forth.

     In Witness Whereof, I have hereunto set my hand and official seal this 25th
day of February, 1997.

                                       /s/ Kay Anderson-Webe
                                      -----------------------
                                      Notary Public in and for 
                                      the County and State
                                      aforesaid
[Notarial Seal]
My commission expires:

                                       7
<PAGE>
 
State of Illinois       )
                        )  SS.
County of Cook          )

     I, J.W. Jones, a Notary Public in and for the County and State aforesaid,
do hereby certify that on this 28th day of February, 1997, personally appeared
before me George N. Reaves and Brian King, to me personally known, and
personally known to me to be the same persons whose names are subscribed to the
foregoing instrument, who being by me duly sworn, did say that they are the Vice
President and the Asst. Vice President, respectively, of First Trust National
Association, a national banking association organized and existing under the
national banking laws of the United States of America, that the seal affixed to
the above and foregoing instrument is the corporate seal of said association and
that said instrument was signed by them and sealed and delivered in behalf of
said association by authority of its Board of Directors duly given, and the said
George N. Reaves and Brian King acknowledged said instrument to be their free
and voluntary act and deed and the free and voluntary act and deed of said
association for the uses and purposes therein set forth.

     In Witness Whereof, I have hereunto set my hand and official seal this 28th
day of February, 1997.

                                       /s/ J. W. Jones
                                      ------------------------
                                      Notary Public in and for 
                                      the County and State
                                      aforesaid
[Notarial Seal]
My commission expires:

                                       8
<PAGE>
 
State of Illinois       )
                        )  SS.
County of Cook          )

     I, Stacy M. Coleman, a Notary Public in and for the County and State
aforesaid, do hereby certify that on this 27th day of February, 1997, personally
appeared before me Russell C. Bergman, personally known to me to be the person
described in and who executed and whose name is subscribed to the foregoing
instrument, and acknowledged that he signed and delivered the said instrument as
his free and voluntary act and deed for the uses and purposes therein set forth.

     In Witness Whereof, I have hereunto set my hand and official seal this 27th
day of February, 1997.

                                      /s/ Stacy M. Coleman
                                     ---------------------------
                                     Notary Public in and for 
                                     the County and State
                                     aforesaid
[Notarial Seal]
My commission expires:

State of Tennessee      )
                        )  SS.
County of Williamson    )

     Personally appeared before me Teresa Morris, who, being duly sworn, says
that she saw the corporate seal of United Cities Gas Company affixed to the
foregoing instrument and that she also saw James B. Ford, Senior Vice President
and Treasurer, and Shirley Hawkins, Secretary of said United Cities Gas Company,
sign and attest the same, and that she, with Pamela Todd witnessed the execution
and delivery thereof as the act and deed of said United Cities Gas Company.

                                     /s/ Teresa Morris
                                    --------------------------
                                            Witness
[Notarial Seal]

Sworn to before me this      day of                    , 1997.

                                    Notary Public in and for the
                                    County and State aforesaid
My commission expires:

                                       9
<PAGE>
 
State of California     )
                        )  SS.
County of San Franciso  )

     Personally appeared before me Karen Mitani, who, being duly sworn, says
that she saw the corporate seal of the Bank of America Illinois affixed to the
foregoing instrument and that she also saw M. J. Kruger, Vice President, and
Peet Saaret, Vice President of said Bank of America Illinois, sign and attest
the same, and that she, with J. Savage, witnessed the execution and delivery
thereof as the act and deed of the said Bank of America Illinois.

                                      /s/ Karen Mitani
                                     --------------------------
[Notarial Seal]                           Karen Mitani,
                                             Witness

Sworn to before me this 25th day of February, 1997.

                                     Notary Public in and for the
                                     County and State aforesaid

My commission expires:  March 15, 2000

                                       10
<PAGE>
 
State of Illinois       )
                        )  SS.
County of Cook          )

     Personally appeared before me M.T. Martin, who, being duly sworn, says that
she saw the corporate seal of the First Trust National Association affixed to
the foregoing instrument and that she also saw George N. Reaves, Vice President
and Brian King, Assistant Vice President of said First Trust National
Association, sign and attest the same, and that she, with S. Rhoden, witnessed
the execution and delivery thereof as the act and deed of the said First Trust
National Association.


                                     /s/ M.T. Martin
                                    -------------------------
[Notarial Seal]                          M.T. Martin,
                                           Witness

Sworn to before me this 27th day of February, 1997.

                                    Notary Public in and for the
                                    County and State aforesaid

My commission expires:  December 2, 2000

                                       11
<PAGE>
 
State of Illinois       )
                        )  SS.
County of Cook          )

     Personally appeared before me Frank J. Layo, who, being duly sworn, says
that he saw the within named Russell Bergman sign, seal, and as his act and
deed, deliver the foregoing instrument and that he, with Thomas Tomaszewski,
witnessed the execution thereof.

                                         /s/ Frank J. Layo
                                        ----------------------
                                        Frank J. Layo, Witness
[Notarial Seal]

Sworn to before me this 27th day of February, 1997.

                                     Notary Public in and for the
                                     County and State aforesaid

My commission expires:  May 2, 1998

This Document was Prepared by:
Kristi A. Maher, Esq.
Chapman and Cutler
111 West Monroe Street
Suite 1600
Chicago, IL  60603-4080

                                       12

<PAGE>
 
                                                                 Exhibit 10.7(b)



                      Twenty-Second Supplemental Indenture

                           Dated as of July 29, 1997



                                  By and Among

                            Atmos Energy Corporation

                                      and

                        First Trust National Association

                                      and

                               Russell C. Bergman

                      Supplementing Indenture of Mortgage

                           Dated as of July 15, 1959
<PAGE>
 
     This Twenty-Second Supplemental Indenture, dated as of July 29, 1997, is
made by and among Atmos Energy Corporation, a corporation organized under the
laws of the State of Texas (hereinafter sometimes referred to as "Atmos"), whose
address is 1800 Three Lincoln Center, 5430 LBJ Freeway, Dallas, Texas 75240,
First Trust National Association, a national banking association having its
offices at One Illinois Center, 111 East Wacker Drive, Suite 3000, Chicago,
Illinois  60601 (hereinafter sometimes referred to as "First Trust"), and
Russell C. Bergman, residing in the Village of Frankfort, Illinois.

                                   Recitals:

     The background of this Twenty-Second Supplemental Indenture is:

       1. United Cities Gas Company, a corporation organized under the laws of
the State of Illinois and the Commonwealth of Virginia (hereinafter sometimes
referred to as "UCG"), heretofore executed and delivered to City National Bank
and Trust Company of Chicago and R. Emmett Hanley, as Trustees, its Indenture of
Mortgage dated as of July 15, 1959 (hereinafter sometimes referred to as the
"Original Indenture"), providing for the issuance thereunder from time to time
of First Mortgage Bonds of UCG, issuable in one or more series, and wherein and
whereby UCG did grant, convey, mortgage, warrant to, the said Trustees, and each
of them, and their respective successors and assigns, and create a security
interest in, certain property of UCG in said Original Indenture as more
particularly described therein for the security of all First Mortgage Bonds
issued and to be issued thereunder.

       2. UCG has heretofore executed and delivered twenty-one supplemental
indentures to the Original Indenture, designated as First through Twenty-First
(the Original Indenture and all supplemental indentures, including this Twenty-
Second Supplemental Indenture, are hereinafter referred to as the "Indenture"),
for the purpose of subjecting to the lien of the Indenture certain additional
property heretofore and hereafter acquired by UCG, creating additional series of
First Mortgage Bonds, and amending and supplementing the Indenture in certain
respects.

       3. There have been issued under the Indenture various series of First
Mortgage Bonds designated as Series A through V, inclusive, of which
$115,000,000 in aggregate principal amount are outstanding as of June 30, 1997.
The bonds of Series A, B, C, D, E, F, G, H, I, J, K, L, M, O and S have been
retired as of June 30, 1997.

       4. On September 1, 1961, City National Bank and Trust Company of Chicago
was merged with Continental Illinois National Bank and Trust Company of Chicago,
formerly known as Continental Bank, National Association, a national banking
association, which changed from a national banking association to an Illinois
state 

                                       2
<PAGE>
 
bank on June 29, 1994, and is now known as Bank of America Illinois ("BAI"). BAI
and certain of its affiliates entered into a Purchase and Assumption Agreement
with First Bank National Association, the parent company of First Trust, which
provided that First Bank National Association, or an affiliate, would purchase
substantially all of the Illinois trust and agency appointments of BAI,
including the appointment under the Indenture. First Trust and BAI thereupon
entered into an Instrument of Transfer and Assignment of certain Illinois
appointments from BAI to First Trust, which provided for the succession by First
Trust of substantially all of the Illinois trust and agency appointments of BAI,
including the Indenture.

       5. The Twenty-First Supplemental Indenture dated as of February 5, 1997,
was executed, delivered, acknowledged and recorded by UCG, First Trust and BAI,
to give notice to all persons that the power to act as Trustee and all right,
title and interest of BAI to all estate, properties, rights, powers and trusts
under the Indenture is now vested in First Trust.

       6. On October 15, 1966, Ray F. Myers became individual trustee under the
Indenture as successor to R. Emmett Hanley who resigned.  On March 15, 1981, M.
J. Kruger became individual trustee under the Indenture as successor to Ray F.
Myers who resigned.  On February 5, 1997, Russell C. Bergman became individual
trustee under the Indenture as successor to M. J. Kruger who resigned.

       7. Pursuant to an Agreement and Plan of Reorganization dated July 19,
1996, as amended by Amendment No. 1 to the Agreement and Plan of Reorganization
dated October 3, 1996, and the Plan of Merger provided for therein, UCG will be
merged with and into Atmos in a statutory merger to become effective under the
laws of the State of Illinois, the State of Texas and the Commonwealth of
Virginia, with Atmos to be the surviving corporation and the successor to UCG
(the "Merger").  Atmos agrees that at the effective time of the Merger (the
"Effective Time"), pursuant to the terms and provisions contained in the
Indenture, it will assume (i) the due and punctual payment of the principal and
interest of the First Mortgage Bonds secured by the Indenture, and (ii) the
performance of all covenants and conditions under the Indenture.

       8. In addition, Atmos agrees that effective as of the Effective Time the
Indenture will be amended as hereinafter set forth and Atmos will not certify or
issue any additional First Mortgage Bonds under the Indenture as hereinafter set
forth.

       9. UCG has obtained and filed with the Trustees the written consent of
the holders of the requisite percentage of the outstanding First Mortgage Bonds
to the amendments to the Indenture herein contained.  All acts and things
necessary to make this Twenty-Second Supplemental Indenture a valid and binding
instrument effective as of the Effective Time in accordance with its terms and
for the purposes herein expressed, 

                                       3
<PAGE>
 
have been done and performed.

       10.  Atmos represents to the Trustees that at the time of the Merger and
after giving effect thereto, no "event of default" (as defined in Section 6.01
of the Indenture) shall or would exist.

     Now, therefore, in consideration of the premises and of the sum of One
Dollar ($1.00) to Atmos duly paid by the Trustees at or before the ensealing and
delivery hereof and for other good and valuable considerations, the receipt
whereof is hereby acknowledged, Atmos hereby covenants to and with the Trustees
and their successors in the trusts under the Indenture, for the equal and pro
rata benefit of all present and future holders of all First Mortgage Bonds
issued, and of the coupons, if any, thereto appertaining, without any
preference, priority or distinction whatsoever, as follows:

                                  Article One

                     Substitution of Successor Corporation

          Section 1.01.  Assumption of Indenture Obligations.  Effective as of
the Effective Time, Atmos, as successor to UCG, assumes the due and punctual
payment of the principal of and interest and premium on the First Mortgage Bonds
secured by the lien of the Indenture and the performance of all the covenants
and conditions contained in the Indenture on the part of UCG.

          Section 1.02.  Mortgage of Property.  Atmos, in order to better secure
the principal of and interest and premium on the First Mortgage Bonds at any
time outstanding under the Indenture according to their tenor and effect and the
performance of and compliance with the covenants and conditions contained in the
Indenture, does hereby mortgage, assign, grant, bargain, sell and convey unto
the Trustees and to their successors in said trust, forever, all of the
property, rights and franchises owned by UCG immediately prior to the Effective
Time which are subject to the lien of the Indenture including the properties
described in Schedule 1 attached hereto and hereby made a part hereof.  The
Indenture shall not by reason of the Merger, or otherwise, constitute or become
a lien upon, and the term "mortgaged property" as used in the Indenture shall
not include or comprise:
              (1) Any property or franchises owned prior to the Effective Time
     by Atmos or which, prior to the Effective Time, were not subject to the
     lien of the Indenture; and
              (2) Any property or franchises which may be purchased, constructed
     or otherwise acquired by Atmos after the Effective Time; excepting only
     betterments, extensions, improvements, additions, repairs, renewals,
     replacements, substitutions and alterations of, to, upon and for, and
     comprising and constituting appurtenances of, or fixtures to, the property
     subject to the lien of the Indenture immediately prior to the Effective
     Time, and renewals, modifications or substitutions of or for contracts
     mortgaged under the Indenture immediately prior to the Effective Time,

                                       4
<PAGE>
 
     which may be purchased, constructed, or otherwise acquired by Atmos from
     and after the Effective Time, which shall be and become subject to the lien
     and operation of the Indenture, notwithstanding the Merger.

Atmos pursuant to Section 8.02(2) of the Indenture does hereby mortgage, assign,
grant, bargain, sell and convey unto the Trustees and their successors the
following properties acquired by Atmos on or after the Effective Time, to wit:

     all betterments, extensions, improvements, additions, repairs, renewals,
     replacements, substitutions and alterations of, to, upon and for, and
     comprising and constituting appurtenances of, or fixtures to, the property
     subject to the lien of the Indenture immediately prior to the Effective
     Time, and renewals, modifications or substitutions of or for contracts
     mortgaged under the Indenture immediately prior to the Effective Time,
     which may be purchased, constructed, or otherwise acquired by Atmos from
     and after the Effective Time, which shall be and become subject to the lien
     and operation of the Indenture, notwithstanding the Merger.

     Subject to such liens and encumbrances as are of the character specified in
Section 3.09 of the Indenture, as amended by this Twenty-Second Supplemental
Indenture;

     But Specifically Reserving and Excepting from the foregoing grant:

       A. All cash, notes, bills and accounts receivable not specifically
pledged under the Indenture;

       B. All stocks, bonds and securities not specifically pledged under the
Indenture;

       C. All merchandise held for resale and consumable materials and supplies
(other than Cushion Gas as defined in clause (c) of Section 5.01 of the
Sixteenth Supplemental Indenture to the Original Indenture);

       D. The last day of the term of each leasehold estate;

       E. All automotive equipment; and

       F. All inventory of pipe, meters and equipment (excluding any such
inventory constituting a part of the operating system).

     To Have and to Hold all said properties, real, personal and mixed,
mortgaged and conveyed by Atmos, as aforesaid, or intended so to be, unto the
Trustees and their successors forever; subject, however, to the exclusions,
encumbrances, reservations, covenants, conditions, uses and trusts set forth in
the Indenture.

     In Trust, Nevertheless, for the same purposes and upon the same conditions
as are set forth in the Indenture, without preference or priority of any series
of bonds or of any bonds within a series over any of the other bonds by reason
of priority of time of maturity or of the negotiation thereof or otherwise.

                                       5
<PAGE>
 
                                  Article Two
                            Amendments to Indenture

          Section 2.01.  Amendments to Section 3.09 of the Indenture. (a)
Section 3.09 of the Indenture is amended effective as of the Effective Time by
adding a new subsection (p) which shall read in its entirety as follows:

              (p) any mortgage, pledge, encumbrance, lien or charge of any kind
     on (i) properties or assets of any character owned by Atmos immediately
     prior to the Effective Time, or (ii) any properties or assets of any
     character acquired by the Company on or after the Effective Time, except
     any after acquired properties or assets which constitute "mortgaged
     property" subject to the lien of this Indenture.

       (b) Subsection 3.09(n) is amended effective as of the Effective Time by
deleting the word "and" after the semicolon at the end of the Subsection.

       (c) Subsection 3.09(o) is amended effective as of the Effective Time by
replacing the period (.) at the end of the Subsection with "; and.".

          Section 2.02.  Amendment to Section 3.13 of the Indenture.  The figure
"$500" appearing in the first sentence of Section 3.13 of the Indenture is
amended effective as of the Effective Time to read "$200,000".

          Section 2.03.  Amendment to Section 3.14 of the Indenture.  The figure
"$5,000" appearing twice in Section 3.14 of the Indenture is amended effective
as of the Effective Time in each place to read "$200,000".

          Section  2.04.  Amendment to Section 3.15 of the Indenture.  (a) The
figure "$20,000" appearing in Section 3.15 of the Indenture is amended effective
as of the Effective Time to read "$2,000,000".

       (b) The figure "$990,000" appearing in Section 3.15 of the Indenture is
amended effective as of the Effective Time to read "$5,000,000".

          Section 2.05.  Addition of Section 3.19.  Effective as of the
Effective Time, the following provision shall be added to Article 3 of the
Indenture as Section 3.19 immediately following Section 3.18 of the Indenture
and shall read in its entirety as follows:

          Section 3.19.  The aggregate principal amount of all of the Company's
     Secured Indebtedness outstanding shall not at any time exceed thirty
     percent (30%) of the Net Property of the Company.  For the purposes of this
     Section 3.19, "Net Property" shall mean the aggregate amount of the assets
     of the Company includible in the categories of "property, plant and
     equipment" less the amount of accumulated depreciation and amortization
     attributable to such assets, that is reflected on the Company's balance
     sheet prepared in accordance with generally accepted accounting principles,
     consistently applied, and "Secured Indebtedness" shall mean indebtedness of
     the Company for money borrowed and secured by a lien upon the property of
     the Company.

          Section 2.06.  Amendment to Section 7.02(d) of the Indenture.  The
figure "$5,000" appearing twice in Section 7.02(d) of the Indenture is amended
effective as of the Effective Time in each place to read "$200,000".

          Section 2.07.  Amendments to Section 12.05 of the Indenture. 

                                       6
<PAGE>
 
Section 12.05 is amended effective as of the Effective Time as follows:

              (a) Subsection (t) of Section 12.05 shall be restated in its
     entirety to read as follows:

                  (t) "Prior Liens" means any mortgages or other instruments
          constituting a lien upon property hereafter acquired by the Company
          prior to the lien of this Indenture; provided, however, that Prior
          Liens shall not include any liens on properties, (i) owned by Atmos
          immediately prior to the Effective Time, or (ii) acquired by the
          Company after the Effective Time, except any after acquired properties
          which constitute "mortgaged property" subject to the lien of this
          Indenture.

            (b) The following new Subsections (v), (w), (x), (y) and (z) are
     added to Section 12.05 following Subsection (u):

                  (v) "Atmos" means Atmos Energy Corporation, a corporation
          organized under the laws of the State of Texas immediately prior to
          the Effective Time and organized under the laws of the State of Texas
          and Commonwealth of Virginia on and after the Effective Time.

                  (w) "Effective Time" shall have the meaning set forth in
          Recital 7 of the Twenty-Second Supplemental Indenture.

                  (x) "Merger" shall have the meaning set forth in Recital 7 of
          the Twenty-Second Supplemental Indenture.

                  (y) "Net Property" shall have the meaning set forth in Section
          2.05 of the Twenty-Second Supplemental Indenture.

                  (z) "Secured Indebtedness" shall have the meaning set forth in
          Section 2.05 of the Twenty-Second Supplemental Indenture.

                                 Article Three
                       Agreement Not to Issue Additional
                    First Mortgage Bonds under the Indenture

     On and after the Effective Time, Atmos hereby agrees not to certify or
issue any additional First Mortgage Bonds or series of First Mortgage Bonds
under the terms and provisions of the Indenture, including but not limited to,
Sections 1.01, 2.02 and 2.03, except as to transfers, substitutions and
exchanges of First Mortgage Bonds provided for in the Indenture with respect to
First Mortgage Bonds outstanding immediately prior to the Effective Time.

                                  Article Four
                                 Miscellaneous

          Section 4.01.  Incorporation of Original Indenture.  This Twenty-
Second Supplemental Indenture shall be construed in connection with and as a
part of the Original Indenture and all terms used in this Twenty-Second
Supplemental Indenture which are defined in the Original Indenture shall, unless
the context 

                                       7
<PAGE>
 
otherwise requires, have the meanings set forth in the Original Indenture.

          Section 4.02.  Successors and Assigns.  Whenever in this Twenty-Second
Supplemental Indenture any of the parties hereto is named or referred to, this
shall be deemed to include the successors or assigns of such party, and all the
covenants and agreements in this Twenty-Second Supplemental Indenture contained
shall bind and inure to the benefit of the respective successors and assigns of
such parties, whether so expressed or not.

          Section 4.03.  Multiple Counterparts.  This Twenty-Second Supplemental
Indenture may be simultaneously executed in any number of counterparts and all
said counterparts executed and delivered, each as an original, shall constitute
but one and the same instrument.

     IN WITNESS WHEREOF, said Atmos Energy Corporation has caused its corporate
name to be hereunto subscribed by its Vice President and its corporate seal to
be hereunto affixed and attested by an Assistant Secretary, and said First Trust
National Association, to evidence its acceptance of the trust hereby created and
in it reposed, has caused its corporate name to be hereunto subscribed by its
Vice President, and its corporate seal to be affixed and attested by an
Assistant Secretary, and said Russell C. Bergman, to evidence his acceptance of
the trust hereby created and in him reposed, has hereunto subscribed his name
and affixed his seal, all as of the day and year first above written.

                                                       Atmos Energy Corporation
[Corporate Seal]
                                                       By
                                                       Glen A. Blanscet
                                                       Vice President
Attest:
By
  Its
Witnesses as to Atmos Energy Corporation:


                                                       First Trust National
                                                       Association, Trustee
[Corporate Seal]
                                                       By
Frank Sgaraglino, Vice President
Attest:

 Witnesses as to First TrustNational Association:

                                                       Russell C. Bergman,
                                                       Individual Trustee
Attest:

Witnesses to Russell C. Bergman:

                                       8
<PAGE>
 
State of Texas          )
                        )  SS.
County of Dallas        )

     I,       , a Notary Public in and for the County and State aforesaid, do
hereby certify that on this      day of           , 1997, personally appeared
before me Glen A. Blanscet and        , to me personally known, and personally
known to me to be the same persons whose names are subscribed to the foregoing
instrument, who being by me duly sworn, did say that they are the Vice President
and the Assistant Secretary, respectively, of Atmos Energy Corporation, a
corporation organized under the laws of the State of Texas, that the seal
affixed to the above and foregoing instrument is the corporate seal of said
corporation and that said instrument was signed by them and sealed and delivered
on behalf of said corporation by authority of its Board of Directors duly given,
and the said          and                acknowledged said instrument to be
their free and voluntary act and deed and the free and voluntary act and deed of
said corporation for the uses and purposes therein set forth.

     In Witness Whereof, I have hereunto set my hand and official seal this
day of               , 1997.
 
                                      Notary Public in and for 
                                      the County and State 
                                      aforesaid
[Notarial Seal]
My commission expires:

                                       9
<PAGE>
 
State of Illinois       )
                        )  SS.
County of Cook          )

     I, Remonia Jamison, a Notary Public in and for the County and State
aforesaid, do hereby certify that on this 23rd day of July, 1997, personally
appeared before me Frank Sgaraglino and Frank Layo, to me personally known, and
personally known to me to be the same persons whose names are subscribed to the
foregoing instrument, who being by me duly sworn, did say that they are the Vice
President and the Assistant Secretary, respectively, of First Trust National
Association, a national banking association organized and existing under the
national banking laws of the United States of America, that the seal affixed to
the above and foregoing instrument is the corporate seal of said association and
that said instrument was signed by them and sealed and delivered on behalf of
said association by authority of its Board of Directors duly given, and the said
Frank Sgaraglino and Frank Layo acknowledged said instrument to be their free
and voluntary act and deed and the free and voluntary act and deed of said
association for the uses and purposes therein set forth.

     In Witness Whereof, I have hereunto set my hand and official seal this 23rd
day of July, 1997.
 
                                      Notary Public in and for 
                                      the County and State 
                                      aforesaid
[Notarial Seal]
My commission expires:

                                       10
<PAGE>
 
State of Illinois       )
                        )  SS.
County of Cook          )

     I, Remonia Jamison, a Notary Public in and for the County and State
aforesaid, do hereby certify that on this 23rd day of July, 1997, personally
appeared before me Russell C. Bergman, personally known to me to be the person
described in and who executed and whose name is subscribed to the foregoing
instrument, and acknowledged that he signed and delivered the said instrument as
his free and voluntary act and deed for the uses and purposes therein set forth.

     In Witness Whereof, I have hereunto set my hand and official seal this 23rd
day of July, 1997.
 
                                        Notary Public in and for 
                                        the County and State 
                                        aforesaid
[Notarial Seal]
My commission expires:

                                       11
<PAGE>
 
State of Texas          )
                        )  SS.
County of Dallas        )

     Personally appeared before me                 , who, being duly sworn, 
says that             saw the corporate seal of Atmos Energy Corporation 
affixed to the foregoing instrument and that         also saw Glen A. Blanscet,
Vice President and          , Assistant Secretary of said Atmos Energy 
Corporation, sign and attest the same, and that             , with           ,
witnessed the execution and delivery thereof as the act and deed of said 
Atmos Energy Corporation.
 
                                 Witness
[Notarial Seal]
Sworn to before me this      day of               , 1997.

                         Notary Public in and for the County and           
                         State aforesaid
My commission expires:

                                       12
<PAGE>
 
State of Illinois       )
                        )  SS.
County of Cook          )

     Personally appeared before me Sandra Rhoden, who, being duly sworn, says
that she saw the corporate seal of the First Trust National Association affixed
to the foregoing instrument and that she also saw Frank Sgaraglino, Vice
President and Frank Layo, Assistant Secretary of said First Trust National
Association, sign and attest the same, and that she, with Pamela Burrows,
witnessed the execution and delivery thereof as the act and deed of the said
First Trust National Association.
 
[Notarial Seal]                                                         Witness

Sworn to before me this 23rd day of July, 1997.

                         Notary Public in and for the County and           
                         State aforesaid
My commission expires:

                                       13
<PAGE>
 
State of Illinois       )
                        )  SS.
County of Cook          )

     Personally appeared before me Pamela Burrows, who, being duly sworn, says
that she saw the within named Russell C. Bergman sign, seal, and as his act and
deed, deliver the foregoing instrument and that she, with Sandra Rhoden,
witnessed the execution thereof.
 
                                 Witness
[Notarial Seal]

Sworn to before me this 23rd day of July, 1997.

                         Notary Public in and for the County and           
                         State aforesaid

My commission expires:

This Document was Prepared by:
Kristi A. Maher, Esq.
Chapman and Cutler
111 West Monroe Street
Suite 1600
Chicago, IL  60603-4080

                                       14
<PAGE>
 
                                     Schedule 1

To Twenty-Second Supplemental Indenture

Dated as of July 29, 1997

Descriptions of Additional Mortgaged Property

     The following gas distribution systems acquired by the Company, together
with all pipelines, mains, connection, service pipes, fittings, meters,
regulators, regulator stations and buildings, tools, instruments, appliances,
apparatus, facilities, machinery and other property used or provided for use, in
the construction, maintenance, repair or operation thereof and together also
with all of the rights, privileges, rights-of-way, franchises, licenses,
easements, grants and permits with respect to the construction, maintenance,
repair and operation of such gas distribution systems:

            1.      The operating system of Stark Natural Gas acquired by the
                    Company located in the county of Neosho, Kansas.
            2.      The operating system of Palmyra Natural Gas System acquired
                    by the Company located in the county of Marion, Missouri.
            3.      The operating system of Monarch Gas Company acquired by the
                    Company by merger located in the counties of Fayette,
                    Illinois, and Effingham, Illinois.

                                       15

<PAGE>
 
                                                                 Exhibit 10.8(a)


                            Atmos Energy Corporation


               (Successor by Merger to United Cities Gas Company)


                                       to


                        First Trust National Association


                                   as Trustee


 


                          First Supplemental Indenture


                           Dated as of July 29, 1997
                                        
<PAGE>
 
     This First Supplemental Indenture, dated as of the 29th day of July, 1997,
by and between Atmos Energy Corporation, ("Atmos"), a corporation duly organized
and existing under and by virtue of the laws of the State of Texas (hereinafter
sometimes called the "Company"), and First Trust National Association, successor
to Bank of America Illinois, as Trustee, a national banking association
organized and existing under the laws of the United States, having its principal
place of business in Chicago, Illinois, as Trustee (hereinafter sometimes
referred to as "Trustee"),

                                   Witnesseth

     Whereas, United Cities Gas Company ("United Cities") has heretofore
executed and delivered to the Trustee an Indenture dated as of November 15,
1995;

     Whereas, there are currently outstanding three tranches, all of the same
series, of medium-term notes under the Indenture designated, respectively,
"Medium-Term Notes, Series A 1995-1, 6.67% due December 15, 2025," "Medium-Term
Notes, Series A 1995-2, 6.27% due December 19, 2010," and "Medium-Term Notes,
Series A 1995-3, 6.20%, due December 19, 2000" (hereinafter referred to as the
"Medium-Term Notes" or the "Outstanding Securities").

     Whereas, effective on the date hereinafter written, United Cities merged
with and into Atmos (the "Merger") and Atmos is the surviving company of the
Merger.

     Whereas, as a result of the Merger, all property, rights, privileges,
powers and franchises of United Cities vested in Atmos, and all rights of the
Trustee and the holders of the Outstanding Securities were preserved unimpaired,
and are enforceable against Atmos to the same extent as if it had been named a
party to the Indenture.

     Whereas, Article Eleven of the Indenture permits United Cities to merge
with and into another corporation provided that the surviving corporation
executes and delivers to the Trustee a supplemental indenture in and by which it
expressly assumes the due and punctual payment of the principal of and premium,
if any, and interest, if any, on all Outstanding Securities according to their
tenor, and the due and punctual performance of every covenant of the Indenture
to be performed or observed by United Cities.

     Whereas, the execution and delivery of this First Supplemental Indenture
has been duly authorized by Atmos and all conditions precedent to the execution
and delivery hereof by Atmos and the Trustee provided for in the Indenture have
been complied with, and all acts and things necessary to constitute this First
Supplemental Indenture a valid indenture and agreement according to the terms
thereof have been done and performed.

     Whereas, the Trustee has duly determined to execute this First Supplemental
Indenture and to be bound, insofar as lawful, 

                                       2
<PAGE>
 
by the provisions thereof;

     Now, Therefore, in consideration of the premises, the covenants and
agreements hereinafter contained, and for other valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, Atmos, for the equal
and proportionate benefit of the respective holders from time to time of the
Medium-Term Notes, has executed and delivered this First Supplemental Indenture;
and Atmos, for itself and its successors and assigns, does hereby covenant and
agree to and with the Trustee and its successors as follows:

                                     Part I
                    Assumption of Obligations and Liabilities

     Atmos (i) assumes and agrees to pay, duly and punctually, the principal of,
premium, if any, and interest, if any, on all Medium-Term Notes according to
their terms and the terms of the Indenture and (ii) agrees to perform and
observe, duly and punctually, all other terms, covenants and conditions of the
Indenture to be performed or observed by United Cities thereunder or in
connection therewith.

                                    Part II
                             Concerning the Trustee

     The Trustee accepts the trusts hereunder and agrees to perform the same but
only upon the terms and conditions set forth in the Indenture.  Without limiting
the generality of the foregoing, the Trustee assumes no responsibility for the
correctness of the recitals of fact herein contained, which shall be taken as
the statements of Atmos.  The Trustee makes no representations and shall have no
responsibility as to the validity of this First Supplemental Indenture.

                                    Part III
                           Reaffirmation of Indenture

     As supplemented by this First Supplemental Indenture, the Indenture is in
all respects ratified and confirmed, and the Indenture and the First
Supplemental Indenture shall be read, taken and construed as one and the same
instrument.

                                    Part IV
                                 Miscellaneous

     This First Supplemental Indenture may be executed in several counterparts,
and all such counterparts, executed and delivered, each as an original, shall
constitute but one and the same instrument.

     In Witness Whereof, Atmos Energy Corporation has caused this First
Supplemental Indenture to be signed and acknowledged by its President or one of
its Vice Presidents, and its corporate seal to be affixed hereunto, and the same
to be attested by its 

                                       3
<PAGE>
 
Secretary or one of its Assistant Secretaries, and First Trust National
Association has caused this First Supplemental Indenture to be signed and
acknowledged by one of its Vice Presidents, and its corporate seal to be affixed
hereunto, and the same to be attested by one of its Assistant Secretaries, all
as of the day and year first above written

                                 Signature Page

                                             Atmos Energy Corporation
                                             By
                                              President
                                                     (Seal)Attest:

                                              Secretary

                                              First Trust National
                                              Association, as Trustee



                                              By:
                                              Vice President and 
                                                Assistant Secretary
 

(Seal)                                Attest:

                                              Assistant Secretary


State of Texas      )
                    )    SS:
County of           )

     On the     day of          , 1997, before me personally came to me known,
who, being by me duly sworn, did depose and say that he is the                of
Atmos Energy Corporation, a Texas and Virginia corporation, one of the
corporations described in and which executed the foregoing instrument; that he
knows the seal of said corporation; that the seal affixed to said instrument is
such corporation's seal; that it was so affixed by authority of the Board of
Directors of said corporation; and that he signed his name thereto by like
authority.

 
                                                        Notary Public

(Notarial Seal)

                                       4
<PAGE>
 
State of Illinois   )
                    )    SS:
County of Cook      )

     On the      day of         , 1997, before me personally came
to me known, who, being by me duly sworn, did depose and say that he is the Vice
President and Assistant Secretary of First Trust National Association, one of
the corporations described in and which executed the foregoing instrument; that
he knows the seal of said corporation; that the seal affixed to said instrument
is such corporation's seal; that it was so affixed by authority of the Board of
Directors of said corporation; and that he signed his name thereto by like
authority.


 
                                                Notary Public

(Notarial Seal)

                                       5

<PAGE>
 
                                                                EXHIBIT 10.10(a)

                                                              Contract No.123535


                   FIRM GAS TRANSPORTATION SERVICE AGREEMENT

     THIS SERVICE AGREEMENT (Agreement), made and entered into as of this 1st
day of November, 1995, by and between Public Service Company of Colorado
(Company), a Colorado corporation, having a mailing address of P.O. Box 840,
Denver, Colorado, 80202, and Greeley Gas Company, a Division of Atmos Energy
Corporation (Shipper), a Texas corporation, having a mailing address of 700
Three Lincoln Centre, 5430 LBJ Freeway, P.O. Box 650205, Dallas, Texas 75265-
0205.  Company and Shipper are collectively referred to as the "Parties."


                            THE PARTIES REPRESENT:

     Shipper has by separate agreement acquired supplies of natural gas,
hereinafter referred to as "Shipper's Gas";

     Shipper has made the necessary arrangements and/or has entered into
separate agreements to cause Shipper's Gas to be delivered to Company's Receipt
Point(s) as specified in Exhibit(s)"A-1"-"C-2";

     Shipper has requested and Company agrees to receive and transport Shipper's
Gas from the Receipt Point(s) to the Delivery Point(s), as specified in
Exhibit(s) "A-1"-"C-2", on a firm capacity basis and, if applicable, to sell gas
to Shipper on a firm supply reservation basis; and

     Shipper assumes responsibility for the installation and maintenance costs
for a communication line necessary for electronic metering for the facility(s)
specified in Exhibit(s) "A-1", "B-1" and "C-1".


                   THEREFORE, THE PARTIES AGREE AS FOLLOWS:

     1.  Shipper acknowledges and agrees that gas transportation service
provided hereunder is subject to the terms and conditions of Company's
applicable gas transportation tariff as on file and in effect  from time to time
with the Public Utilities Commission of the State of Colorado (Commission) and
such terms and conditions are incorporated herein as part of this Agreement.

     2.  Rates and Payment:  Transportation service, Firm Capacity service and
Firm Supply Reservation service provided by Company under this Service Agreement
shall be paid for by Shipper at the charges under the standard rate set forth in
Company's gas transportation tariff unless otherwise specified in Exhibit(s) "A-
1"-"C-2".  Applicable facility charges shall be paid at the 
<PAGE>
 
rate set forth in Company's Gas Transportation Tariff unless otherwise specified
in Exhibit(s) "A-1"-"C-2".

     3.  Back-up Supply Sales Service:  In the event that adequate supplies of
Shipper's gas are not available for receipt by Company,  Company shall sell to
Shipper sufficient quantity(s) of natural gas as necessary to meet Shipper's
backup natural gas supply needs, up to the Total Peak Day Quantity for the Firm
Supply Reservation Service (if any) as specified in Exhibit(s) "A-1"-"C-2", but
in no event greater at any Delivery Point than the Firm Capacity Peak Day
Quantity at such Delivery Point as specified in Exhibit(s) "A-1"-"C-2", except
as provided for in paragraph 10 hereof.  To the extent that the Shipper does not
purchase Firm Supply Reservation Service or exceeds the Firm Capacity Peak Day
Quantity at any Delivery Point, Company will provide Back-up Supply Sales
Service on an interruptible basis, as available.

     All natural gas sold by Company to Shipper shall be at the Back-up Supply
Sales Charge specified in Company's gas transportation tariff.

     4.  Quality:  Gas delivered by the Shipper or for the Shipper's account at
the Receipt Point(s) as specified in Exhibit(s) "A-1"-"C-2" shall conform  to
the specifications for gas as specified in Exhibit "D" and Exhibit "E".

     5.  Term - Effective Date:  This Agreement shall be effective November 1,
1995, and shall continue in full force and effect until the Service Termination
Date(s) specified on Exhibit(s) "A-1"-"C-2" or October 1, 1996, and from year to
year thereafter, until terminated by either party effective upon such Service
Termination Date(s) or October 1 of any suceeding year upon thirty (30) days
prior written notice.
 
     6.  Notices:  Except as otherwise provided, any notice or information that
either party may desire to give to the other regarding this agreement shall be
in writing to the following address, or to such other address as either of the
parties shall designate in writing.

COMPANY:                                      SHIPPER:
Payments Only:                                Invoices only
Public Service Company of Colorado            Greeley Gas Company, a
P.O. Box 17230                                Division of Atmos
Denver, Colorado 80217-0230                   Energy Corporation
(303) 623-1234                                Attn:  IntraState Gas 
SupplyFax: (303) 294-2136                     P.O. Box 650205
                                              Dallas, Texas 75265-0205
                                              Phone: (214) 788-3747
                                              Fax: (214) 788-3773

                                       2
<PAGE>
 
All Others
Public Service Company                        Greeley Gas Company, a
of Colorado                                   Division of
Seventeenth Street Plaza                      Atmos Energy Corporation
1225 17th Street, Suite 1100                  Attn:  IntraState Gas Supply
Denver, Colorado 80202-5533                   P.O. Box 650205
Attn:  Unit Manager, Gas                      Dallas, Texas 75265-0205
Transportation                                Phone: (214) 788-3749
Phone: (303) 294-2012                         Fax: (214) 788-3773
Fax: (303) 294-2757


     Routine communications, including monthly statements and payments, shall be
considered as duly delivered or furnished three (3) days after being mailed or
when transmitted electronically.

     7.  Assignment - Consent:  This Service Agreement shall not be assigned by
either party hereto, without the prior written consent of the other party.
Consent for assignment of Service Agreement shall not be unreasonably withheld
by or from either party.

     8.  Cancellation of Prior Agreement:  This Service Agreement supersedes,
cancels and terminates, as of the date of this Service Agreement, the following
agreements and any amendments thereto:

     Gas Transportation Service Agreement, dated 6/29/92 (Document No.123535),
     between Greeley Gas Company and Western Gas Supply Company (predecessor to
     Company).

     Gas Transportation Service Agreement, dated 7/16/92 (Document No.123530),
     between Greeley Gas Company and Western Gas Supply Company (predecessor to
     Company).

     Gas Transportation Service Agreement, dated 6/29/92 (Document No.124252),
     between Greeley Gas Company and Western Gas Supply Company (predecessor to
     Company).

     Gas Transportation Service Agreement, dated 7/16/92 (Document No.122111),
     between Greeley Gas Company and Western Gas Supply Company (predecessor to
     Company).

     Service Agreement, dated 10/02/92 (Document No.50772), between Greeley Gas
     Company and Western Gas Supply Company (predecessor to Company).

     Service Agreement, dated 10/21/83 (Document No.7926), (Document No. 7926),
     between Greeley Gas Company and Western Gas Supply Company (predecessor to
     Company).

     Service Agreement, dated 10/21/83 (Document 7846),

                                       3
<PAGE>
 
     between Greely Gas Company and Western Gas Supply Company (predecessor
     to Company).

     Service Agreement, dated 11/08/84 (Document No.7954), between Greeley Gas
     Company and Western Gas Supply Company (predecessor to Company).

     9.  Cancellation of this Service Agreement:    Shipper may cancel this
Service Agreement upon thirty (30) days' written notice.  If Receiving Party(s)
then chooses to return to full firm natural gas service from Company, Company
will, at Receiving Party's request, subject to availability of sufficient
volumes of firm natural gas from Company's suppliers, reinstate Receiving Party
with full firm service under the appropriate tariffs as they may be filed with
the Commission.  Shipper shall be responsible for costs, if any, which may be
incurred by Company due to such termination.

     In the event Shipper no longer desires Firm Transportation Service and
Receiving Party(s) obtains interruptible sales or interruptible transportation
service or converts to an alternate fuel prior to the end of the Contract Period
or any subsequent Contract Period, Shipper may terminate this Agreement by
paying Company a termination charge.  The termination charge shall equal the
Firm Capacity Charge and the Firm Supply Reservation Charge, if applicable,
multiplied by the Receiving Party(s) Peak Day Quantity(s), as described on
Exhibit(s) "A-1"-"C-2", multiplied by the number of months remaining in the
Contract Period.  The parties agree that Shipper shall owe no termination charge
in the event the Agreement is terminated in accordance with paragraph 5 above.

     Either party shall have the further right to terminate this Agreement if
the other party, within ten days following receipt of written notification of a
claim of a material breach hereunder, fails to remedy such material breach and
to indemnify such party for the consequences thereof.  Such termination shall
become effective on the eleventh day following such notification or, if the
notification provides for a different termination date which is later than the
ten-day notification period, on the date specified in such notification..  For
purposes of this paragraph, "material breach" shall include, but not be limited
to, a continuing or repeated failure to perform a basic obligation under this
Agreement and shall not include periodic or isolated failures to perform or
other liquidated claims which can be resolved pursuant to monetary or volume
adjustments.

     This Agreement shall be governed by and construed in accordance with the
laws of the State of Colorado.

     10. Delivery Point Peak Day Quantity:  Peak day volumes identified in the
attached Exhibits represent Shipper's current 

                                       4
<PAGE>
 
and best information of delivery point peaking volumes. Shipper and Company
agree that the parties will reevaluate these volumes on a periodic basis, but at
least once annually, to determine if and at what level any adjustments to the
individual delivery point peaking volumes are needed.

On a monthly basis, Company will review the actual deliveries made to these
points and, provided the total volumes delivered do not exceed the total
contracted-for volume available for that Exhibit area, Company will authorize
any volume exceeding the delivery point Peak Day quantity as authorized overrun
gas. Should delivered volumes at any point consistently exceed the Peak Day
quantity for that point, Shipper will request and Company will accept, subject
to available capacity, an increase in the contracted-for peak day quantity at
the specified delivery point.  In increasing the contracted volume at a receipt
point, Shipper may shift volumes from other points within the same Exhibit area
if volumes at such other points do not exceed maximum peak day quantities in
which case Shipper may request an increase in the overall Contract Maximum Peak
Day quantity, as necessary.

     11. Maximum capacity by Exhibit:  Administrative circumstances require the
separation of electronically metered and non-electronically metered volumes into
two separate Exhibits covering the same regional area, such as Exhibit "A-1"
Electronically Metered Front Range and Exhibit "A-2" Non-Electronically Metered
Front Range, Exhibit "B-1" Electronically Metered Southern and Exhibit "B-2"
Non-Electronically Metered Southern, and Exhibit "C-1" Electronically Metered
Western and Exhibit "C-2" Non-Electronically Metered Western.  This agreement is
intended to make available firm transportation service up to the maximum
contracted volume by Exhibit area, i.e., the Front Range Area (Exhibits "A-1"
and "A-2"), the Southern Area (Exhibit "B-1" and "B-2"), and the Western Area
(Exhibits"C-1" and "C-2"). Therefore, in instances where the total delivered
volumes under any Electronically Metered or Non-Electronically Metered Exhibit
exceed the Maximum Daily Contract quantity for that Exhibit, the parties agree
that transportation will be authorized provided available capacity exists on the
corresponding Electronically Metered or Non-Electronically Metered Exhibit area.

     12. For all Delivery Points listed on Exhibits "A-2", "B-2", and "C-2",
Shipper will nominate transportation volumes based on a percentage volume
provided by Company, therefore, the balancing provisions of Company's Tariff as
they would apply to this Agreement, are waived.

     13. Exhibit(s) and Addendums:  All exhibits attached hereto are
incorporated into the terms of this Agreement.

                                       5
<PAGE>
 
     IN WITNESS WHEREOF, the parties have executed this Firm Gas Transportation
Service Agreement as of the day and year first above written.


Contract No.: 123535


COMPANY:                                 SHIPPER:
PUBLIC SERVICE COMPANY OF COLORADO       GREELEY GAS COMPANY,
                                         A DIVISION OF
                                         ATMOS ENERGY CORPORATION

By: /s/ Merciu Arizone                   By: /s/ Toby A. Priolo
    -----------------------------            ----------------------------
Title: Mgr, Gas Plng, Mktg & Sply        Title: Vice President
       --------------------------                ------------------------

Taxpayer I.D. No. 84-0296600             Taxpayer I.D. No.
                                                          ---------------
Witness/Attest:                          Witness/Attest:

- ---------------------------------        --------------------------------
(please type name)                       (please type name)

 
 

                                       6
<PAGE>
 
                                                            Contract No.: 123535
                     Effective Date Of Agreement: 11/01/95
                       Effective Date of Exhibit: 4/1/96

               EXHIBIT "A-1" ELECTRONICALLY METERED FRONT RANGE

                 TO THE FIRM TRANSPORTATION SERVICE AGREEMENT

                                    BETWEEN

                      GREELEY GAS COMPANY, A DIVISION OF
                      ATMOS ENERGY CORPORATION (Shipper)

                                      AND

                 PUBLIC SERVICE COMPANY OF COLORADO (Company)


     1.  PRIMARY RECEIPT POINT(S)

     Receipt Point             Peak Day Quantity   Utilization Curve
                                     Dth/Day

Associated Natural Gas, Inc.        22,058              General
Mewborn  Residue Plant
Associated Natural Gas, Inc.         4,598              General
Eaton Residue Plant
Associated Natural Gas, Inc.         9,196              General
Roggen Residue Plant
Associated Natural Gas, Inc.         4,598              General
Spindle Residue Plant

     2.  FIRM CAPACITY SERVICE - DELIVERY POINT(S)

<TABLE>
<CAPTION>
                              Firm       Service                Transpor-
                            Capacity       and       Specific     tation    Term   Date Of     Effective     Termin-
 Receiving         Load     Peak Day     Facility    Facility    Commodity  of      First       Date Of       ation
   Party           Point    Quantity     Charge      Charge       Charge    Rate   Delivery     Service      Date of
 & Service                   (Dth)                                                                           Service
  Address
<S>              <C>        <C>          <C>         <C>         <C>        <C>    <C>        <C>          <C>
Ault #1       306412692        800        1st        $185       TF        1yr.    08/26/90    11/1/95     9/30/96
                                           meter
Eaton #1      206412763        500      add'l        $125       TF        1yr.    08/26/90    11/1/95     9/30/96
                                           meter
Kersey Group     706412713      1,000      add'l        $125       TF        1yr.    08/26/90    11/1/95     9/30/96
                                           meter
Lasalle          406412719        900      add'l        $125       TF        1yr.    08/26/90    11/1/95     9/30/96
                                           meter
Lucerne #1    606412723        200      add'l        $125       TF        1yr.    08/26/90    11/1/95     9/30/96
                                           meter
Monfort          706412727        500      add'l        $125       TF        1yr.    08/26/90    11/1/95     9/30/96
 Measuring                                 meter
 Station
North Greeley    106412730     14,000      add'l        $125       TF        1yr.    08/26/90    11/1/95     9/30/96
                                           meter
Platteville      906412745       1000      add'l        $125       TF        1yr.    08/26/90    11/1/95     9/30/96
                                           meter
</TABLE>

                                       7
<PAGE>
 
                                                            Contract No.: 123535
                     Effective Date Of Agreement: 11/01/95
                       Effective Date of Exhibit: 4/1/96


               EXHIBIT "A-1" ELECTRONICALLY METERED FRONT RANGE
                                   (cont'd.)



     2.  FIRM CAPACITY SERVICE - DELIVERY POINT(S)

<TABLE>
<CAPTION>
                               Firm     Service              Transpor-
                             Capacity     and      Specific   tation    Term    Date Of    Effective  Termin-
  Receiving        Load      Peak Day   Facility   Facility  Commodity   of      First      Date Of    ation
    Party          Point     Quantity    Charge     Charge     Charge   Rate    Delivery    Service   Date of
  & Service                    (Dth)                                                                  Service
   Address
<S>              <C>        <C>         <C>       <C>       <C>        <C>     <C>        <C>        <C>
South Greeley    106412754      2,000    addt'l.      $125     TF       1yr.    08/26/90    11/1/95   9/30/96
                                          meter
West Greeley     606412761     18,715    addt'l.      $125     TF       1yr.    08/26/90    11/1/95   9/30/96
                                          meter
</TABLE>

     Total Firm Capacity Reservation Peak Day Quantity: 39,615Dth


     3.  FIRM SUPPLY RESERVATION SERVICE

    Front Range          Effective Date      Termination Date
 Peak Day Quantity         Of Service           Of Service
      Dth/Day
      31,684               11/01/95             May 31, 1996

Total Firm Supply Reservation Peak Day Quantity:  31,684 Dth

                                       8
<PAGE>
 
                                                            Contract No.: 123535

                     Effective Date Of Agreement: 11/01/95
                       Effective Date of Exhibit: 4/1/96

             EXHIBIT "A-2" NON-ELECTRONICALLY METERED FRONT RANGE

                 TO THE FIRM TRANSPORTATION SERVICE AGREEMENT

                                    BETWEEN

                      GREELEY GAS COMPANY, A DIVISION OF
                      ATMOS ENERGY CORPORATION (Shipper)

                                      AND

                 PUBLIC SERVICE COMPANY OF COLORADO (Company)


     1.  PRIMARY RECEIPT POINT(S)


        Receipt Point              Peak Day     Utilization
                                   Quantity        Curve
                                    Dth/Day
 
Associated Natural Gas, Inc.         1928          General
Mewborn  Residue Plant
Associated Natural Gas, Inc.          402          General
Eaton Residue Plant
Associated Natural Gas, Inc.          804          General
Roggen Residue Plant
Associated Natural Gas, Inc.          401          General
Spindle Residue Plant

     2.  FIRM CAPACITY SERVICE - DELIVERY POINT(S)
<TABLE> 
<CAPTION>
                               Firm      Service               Transpor-
                              Capacity     and      Specific    tation    Term    Date Of    Effective    Termin-
 Receiving       Load         Peak Day   Facility   Facility   Commodity   of      First      Date Of      ation
  Party          Point        Quantity   Charge      Charge     Charge    Rate    Delivery    Service     Date of
 & Service                    (Dth)                                                                       Service
 Address
 
<S>            <C>            <C>       <C>        <C>        <C>        <C>     <C>         <C>          <C>
Corsey Group    906412694         20        1st       $185       TF       1yr.    08/26/90    11/1/95     9/30/96
                                          meter
East            606412695         50    addt'l.       $125       TF       1yr.    08/26/90    11/1/95     9/30/96
Keenesburg                                meter
 
Gilcrest        506412766        425    addt'l.       $125       TF       1yr.    08/26/90    11/1/95     9/30/96
                                          meter
Hill-N-Park     206412697        360    addt'l.       $125       TF       1yr.    08/26/90    11/1/95     9/30/96
                                          meter
Hudson          406412700        375    addt'l.       $125       TF       1yr.    08/26/90    11/1/95     9/30/96
                                          meter
Keenesburg      306412710        340    addt'l.       $125       TF       1yr.    08/26/90    11/1/95     9/30/96
                                          meter
Nunn            206412739        175    addt'l.       $125       TF       1yr.    08/26/90    11/1/95     9/30/96
                                          meter
</TABLE>

                                       9
<PAGE>
 
                                                            Contract No.: 123535

                     Effective Date Of Agreement: 11/01/95
                       Effective Date of Exhibit: 4/1/96

             EXHIBIT "A-2" NON-ELECTRONICALLY METERED FRONT RANGE
                                   (cont'd.)


     2.  FIRM CAPACITY SERVICE - DELIVERY POINT(S)

<TABLE>
<CAPTION>
                                Firm     Service             Transpor-
                              Capacity     and     Specific   tation    Term  Date Of   Effective   Termin-
 Receiving Party     Load     Peak Day   Facility  Facility  Commodity   of    First     Date Of     ation
   & Service         Point    Quantity   Charge     Charge    Charge    Rate  Delivery   Service    Date of
   Address                     (Dth)                                                                Service
<S>                <C>        <C>        <C>       <C>       <C>        <C>   <C>        <C>        <C>
Pierce             606412742     400     addt'l.      $125     TF      1yr.   08/26/90    11/1/95   9/30/96
                                           meter
Roggen             706412751      70     addt'l.      $125     TF      1yr.   08/26/90    11/1/95   9/30/96
                                           meter
South Gate         106412768      50     addt'l.      $125     TF      1yr.   08/26/90    11/1/95   9/30/96
Trailer                                   meter
South Roggen       106412773      15     addt'l.      $125     TF      1yr.   08/26/90    11/1/95   9/30/96
                                           meter
West Hudson        306412705     300     addt'l.      $125     TF      1yr.   08/26/90    11/1/95   9/30/96
                                           meter
West LaSalle       506412771      35     addt'l.      $125     TF      1yr.   08/26/90    11/1/95   9/30/96
Group                                     meter
Prospect Valley    306412748      55     addt'l.      $125     TF      1yr.   08/26/90    11/1/95   9/30/96
                                           meter
Miscellaneous                  1,700                           TF      1yr.   08/26/90    11/1/95   9/30/96
Farmtaps
</TABLE>

     Total Firm Capacity Reservation Peak Day Quantity: 4,370 Dth

                                       10
<PAGE>
 
                                                            Contract No.: 123535
                                           Effective Date Of Agreement: 11/01/95
                       Effective Date of Exhibit: 4/1/96

                 EXHIBIT "B-1" ELECTRONICALLY METERED SOUTHERN

                 TO THE FIRM TRANSPORTATION SERVICE AGREEMENT

                                    BETWEEN

                      GREELEY GAS COMPANY, A DIVISION OF
                      ATMOS ENERGY CORPORATION (Shipper)

                                      AND

                 PUBLIC SERVICE COMPANY OF COLORADO (Company)

     1.  PRIMARY RECEIPT POINT(S)

           Receipt Point           Peak Day         Utilization Curve
                                   Quantity
                                    Dth/Day
 
         Outlet of Tiffany           6,500              Stabilized
         Compressor Station


     2.  FIRM CAPACITY SERVICE - DELIVERY POINT(S)

<TABLE>
<CAPTION>
                                 Firm     Service              Transpor-
                               Capacity     and     Specific    tation    Term   Date Of   Effective  Termination
   Receiving        Load       Peak Day   Facility  Facility   Commodity   of     First     Date Of     Date of
    Party           Point      Quantity   Charge     Charge     Charge    Rate   Delivery   Service     Service
   & Service                    (Dth)
    Address
<S>               <C>         <C>        <C>        <C>        <C>       <C>    <C>        <C>        <C>
Crested Butte     406412639        700    addt'l      $125       TF       1yr.   11/28/90    11/1/95     9/30/96
Town                                       meter
Border Station
East Gunnison     306412687      2,500    addt'l      $125       TF       1yr.   05/06/87    11/1/95     9/30/96
Town                                       meter
Border Station
Salida Town       206412701      2,600    addt'l      $125       TF       1yr.   05/06/87    11/1/95     9/30/96
Border Station                             meter
 
</TABLE>

     Total Firm Capacity Reservation Peak Day Quantity: 5,800 Dth

                                       11
<PAGE>
 
                                                            Contract No.: 123535
                                           Effective Date Of Agreement: 11/01/95
                                               Effective Date of Exhibit: 4/1/96

               EXHIBIT "B-2" NON-ELECTRONICALLY METERED SOUTHERN

                 TO THE FIRM TRANSPORTATION SERVICE AGREEMENT

                                    BETWEEN

                      GREELEY GAS COMPANY, A DIVISION OF
                      ATMOS ENERGY CORPORATION (Shipper)

                                      AND

                 PUBLIC SERVICE COMPANY OF COLORADO (Company)



     1.  PRIMARY RECEIPT POINT(S)

          Receipt Point         Peak Day Quantity       Utilization Curve
                                     Dth/Day
Outlet of Tiffany Compressor          1,115                Stabilized
Station

     2.  FIRM CAPACITY SERVICE - DELIVERY POINT(S)

<TABLE>
<CAPTION>
                                Firm     Service               Transpor-
                              Capacity     and       Specific   tation    Term   Date Of   Effective  Termin-
Receiving Party     Load      Peak Day   Facility    Facility  Commodity   of     First     Date Of    ation
   & Service        Point     Quantity   Charge       Charge     Charge   Rate  Delivery    Service   Date of
    Address                     (Dth)                                                                 Service
<S>                <C>        <C>        <C>         <C>       <C>       <C>    <C>        <C>        <C>
Poncha Springs     706412690      100     addt'l.      $125       TF      1yr.   11/28/90    11/1/95   9/30/96
                                            meter
Chalk Creek        206412678       85     addt'l.      $125       TF      1yr.   05/06/87    11/1/95   9/30/96
                                            meter
Tomichi Village    106412706       40     addt'l.      $125       TF      1yr.   05/06/87    11/1/95   9/30/96
                                            meter
West Gunnison      906412707      375     addt'l.      $125       TF      1yr.   05/06/87    11/1/95   9/30/96
Town Border                                 meter
Micellaneous                      800                             TF      1yr.   05/06/87    11/1/95   9/30/96
Farmtaps
</TABLE>

     Total Firm Capacity Reservation Peak Day Quantity: 1,400 Dth

                                       12
<PAGE>
 
                                                            Contract No.: 123535
                                           Effective Date Of Agreement: 11/01/95
                                               Effective Date of Exhibit: 4/1/96

                 EXHIBIT "C-1" ELECTRONICALLY METERED WESTERN

                 TO THE FIRM TRANSPORTATION SERVICE AGREEMENT

                                    BETWEEN

                      GREELEY GAS COMPANY, A DIVISION OF
                      ATMOS ENERGY CORPORATION (Shipper)

                                      AND

                 PUBLIC SERVICE COMPANY OF COLORADO (Company)

     1.  PRIMARY RECEIPT POINT(S)


 Receipt Point         Peak Day Quantity        Utilization Curve
                            Dth/Day
KNGWRD                         680                   General
MOFRRO                         575                   General
LONGCA                         266                   General
NF1GCA                       1,770                   General
NF1GHC                       3,540                   General
NF2GCA                       3,540                   General
ROSGCA                          89                   General
TERGCA                          22                   General
TWIGCA                          66                   General 


     2.  FIRM CAPACITY SERVICE - DELIVERY POINT(S)

<TABLE>
<CAPTION>
                                 Firm     Service              Transpor-
                               Capacity     and     Specific    tation    Term   Date Of    Effective   Termin-
  Receiving        Load        Peak Day   Facility  Facility   Commodity  of      First      Date Of     ation
    Party          Point       Quantity   Charge     Charge     Charge    Rate   Delivery    Service    Date of
  & Service                     (Dth)                                                                   Service
   Address
<S>               <C>          <C>        <C>       <C>       <C>        <C>   <C>        <C>          <C>
Craig             206412744      4,648    addt'l      $125        TF      1yr.   10/20/86    11/1/95     9/30/96
                                           meter
Meeker            706413010      1,000    addt'l      $125        TF      1yr.   10/20/86    11/1/95     9/30/96
                                           meter
Hayden Town       506412747        700    addt'l      $125        TF      1yr.   10/20/86    11/1/95     9/30/96
Border Station                             meter
 
Mt. Werner #1     506412752      2,600    addt'l      $125        TF      1yr.   10/20/86    11/1/95     9/30/96
                                           meter
Steamboat Town    306412772      1,215    addt'l      $125        TF      1yr.   10/20/86    11/1/95     9/30/96
Border Station                             meter
 
</TABLE>

     Total Firm Capacity Reservation Peak Day Quantity: 10,163 Dth

                                       13
<PAGE>
 
                                                            Contract No.: 123535
                                           Effective Date Of Agreement: 11/01/95
                                               Effective Date of Exhibit: 4/1/96

               EXHIBIT "C-2" NON-ELECTRONICALLY METERED WESTERN

                 TO THE FIRM TRANSPORTATION SERVICE AGREEMENT

                                    BETWEEN

                      ATMOS ENERGY CORPORATION (Shipper)

                                      AND

                      GREELEY GAS COMPANY, A DIVISION OF
                 PUBLIC SERVICE COMPANY OF COLORADO (Company)


     1.  PRIMARY RECEIPT POINT(S)

       Receipt Point     Peak Day Quantity         Utilization Curve
                              Dth/Day
 
KNGWRD                          88                      General
MOFRRO                          75                      General
LONGCA                          34                      General
NF1GCA                         230                      General
NF1GHC                         460                      General
NF2GCA                         460                      General
ROSGCA                          11                      General
TERGCA                           3                      General
TWIGCA                           9                      General 

     2.  FIRM CAPACITY SERVICE - DELIVERY POINT(S)

<TABLE>
<CAPTION>
                                Firm      Service               Transpor-
                               Capacity     and      Specific    tation    Term   Date Of   Effective   Termin-
 Receiving         Load        Peak Day   Facility   Facility   Commodity   of     First     Date Of     ation
   Party           Point       Quantity    Charge     Charge     Charge    Rate   Delivery   Service    Date of
 & Service                     (Dth)                                                                    Service
  Address
<S>               <C>         <C>         <C>        <C>        <C>        <C>   <C>        <C>        <C>
Thompson Hill     406412762         45    addt'l.      $125        TF      1yr.   10/20/86    11/1/95   9/30/96
                                            meter
Milner Town       106412749         65    addt'l.      $125        TF      1yr.   10/20/86    11/1/95   9/30/96
Border                                     meter
 
Steamboat II      206412758        200    addt'l.      $125        TF      1yr.   10/20/86    11/1/95   9/30/96
West                                       meter
 
Brooklyn Group    606412737        627    addt'l.      $125        TF      1yr.   10/20/86    11/1/95   9/30/96
                                            meter
Miscellaneous                    1,233                             TF      1yr.   10/20/86    11/1/95   9/30/96
Farmtaps
</TABLE>

     Total Firm Capacity Reservation Peak Day Quantity:  2,170 Dth

                                       14
<PAGE>
 
                                                            Contract No.: 123535
                                           Effective Date Of Agreement: 11/01/95
                                             Effective Date of Exhibit: 11/01/95

                                  EXHIBIT "D"

                            GAS UTILIZATION CURVES

                         Stabilized Utilization Curve

A graph depicting PSCo's stabilized utilization curve appeared here in the
original document.

The Utilization Curve is a general representation of the natural gas quality
which is acceptable from a utilization standpoint.  However, the gas composition
must be known in order to determine if a supply is acceptable and can be
interchanged with supplies in a pipeline system.  PSCo reserves the right in all
instances to evaluate gas composition to determine system compatibility and to
refuse any gas which is unacceptable from a utilization basis.

                                       15
<PAGE>
 
                                                            Contract No.: 123535
                                           Effective Date Of Agreement: 11/01/95
                                             Effective Date of Exhibit: 11/01/95

                                  EXHIBIT "E"

                            GAS UTILIZATION CURVES


                           General Utilization Curve

A graph depicting PSCo's general utilization curve appeared here in the original
document.


The Utilization Curve is a general representation of the natural gas quality
which is acceptable from a utilization standpoint.  However, the gas composition
must be known in order to determine if a supply is acceptable and can be
interchanged with supplies in a pipeline system.  PSCo reserves the right in all
instances to evaluate gas composition to determine system compatibility and to
refuse any gas which is unacceptable from a utilization basis.

                                       16

<PAGE>
 
                                                                EXHIBIT 10.21(f)
May 14, 1997


Mr. Larry J. Dagley
Atmos Energy Corporation
P.O. Box 650205
Dallas, Texas 75265

Dear Mr. Dagley:

     Atmos Energy Corporation (the "Company") considers it essential to the best
interests of its shareholders to foster the continuous employment of key
management personnel.  In this connection, the Board of Directors of the Company
(the "Board") recognizes that, as is the case with many publicly held
corporations, the possibility of a change in control may exist and that such
possibility, and the uncertainty and questions which it may raise among
management, may result in the departure or distraction of management personnel
to the detriment of the Company and its shareholders.

     The Board has determined that appropriate steps should be taken to
reinforce and encourage the continued attention and dedication of members of the
Company's management, including yourself, to their assigned duties without
distraction in the face of potentially disturbing circumstances arising from the
possibility of a change in control of the Company.

     In order to induce you to remain in the employ of the Company and in
consideration of your agreement set forth in Subsection 2(ii) hereof, the
Company agrees that you shall receive the severance benefits set forth in this
letter agreement ("Agreement") in the event your employment with the Company is
terminated subsequent to a "change in control of the Company" (as defined in
Section 2 hereof) under the circumstances described below.

     1.   Term of Agreement.  This Agreement shall commence on the date hereof
and shall continue in effect through December 31, 1997; provided, however, that
commencing on January 1, 1998 and each January 1 thereafter, the term of this
Agreement shall automatically be extended for one additional year unless, not
later than July 1 of the preceding year, the Company shall have given notice
that it does not wish to extend this Agreement; provided, further, if a change
in control of the Company shall have occurred during the original or extended
term of this Agreement, this Agreement shall continue in effect for a period of
thirty-six (36) months beyond the month in which such change in control
occurred.
<PAGE>
 
     Change in Control.  (i)  No benefits shall be payable hereunder unless
there shall have been a change in control of the Company, as set forth below.
For purposes of this Agreement, a "change in control of the Company" shall be
deemed to have occurred if (A) any "person" (as such term is used in Sections
13(d) and 14(d) of the Securities Exchange Act of 1934, as amended (the
"Exchange Act")), other than a trustee or other fiduciary holding securities
under an employee benefit plan of the Company, is or becomes the "beneficial
owner" (as defined in Rule 13d-3 under the Exchange Act), directly or
indirectly, of securities of the Company representing 33 1/3% or more of the
combined voting power of the Company's then outstanding securities; or (B)
during any period of two consecutive years (not including any period prior to
the execution of this Agreement), individuals who at the beginning of such
period constitute the Board and any new director (other than a director
designated by a person who has entered into an agreement with the Company to
effect a transaction described in clauses (A) or (C) of this Subsection) whose
election by the Board or nomination for election by the Company's shareholders
was approved by a vote of at least two-thirds (2/3) of the directors then still
in office who either were directors at the beginning of the period or whose
election or nomination for election was previously so approved, cease for any
reason to constitute a majority thereof; or (C) the shareholders of the Company
approve a merger or consolidation of the Company with any other corporation,
other than a merger or consolidation which would result in the voting securities
of the Company outstanding immediately prior thereto continuing to represent
(either by remaining outstanding or by being converted into voting securities of
the surviving entity) at least 60% of the combined voting power of the voting
securities of the Company or such surviving entity outstanding immediately after
such merger or consolidation, or the shareholders of the Company approve a plan
of complete liquidation of the Company or an agreement for the sale or
disposition by the Company of all or substantially all the Company's assets.

          (ii)  For purposes of this Agreement, a "potential change in control
of the Company" shall be deemed to have occurred if (A) the Company enters into
an agreement, the consummation of which would result in the occurrence of a
change in control of the Company, (B) any person (including the Company)
publicly announces an intention to take or to consider taking actions which if
consummated would constitute a change in control of the Company; (C) any person,
other than a trustee or other fiduciary holding securities under an employee
benefit plan of the Company, who is or becomes the beneficial owner, directly or
indirectly, of securities of the Company representing 9.5% or more of the
combined voting power of the Company's then outstanding securities, increases
his beneficial ownership of such securities by 5% or more over the percentage so
owned by such person on the date hereof; or (D) the Board adopts a resolution to
the effect that, for purposes of this Agreement, a potential change in control
of the Company has occurred.  You 

                                       2
<PAGE>
 
agree that, subject to the terms and conditions of this Agreement, in the event
of a potential change in control of the Company, you will remain in the employ
of the Company until the earliest of (i) a date which is six (6) months after
the occurrence of such potential change in control of the Company, (ii) the
termination by you of your employment by reason of Disability or Retirement (at
your normal retirement age), as defined in Subsection 3(i), or (iii) the
occurrence of a change in control of the Company.

          (iii)     Notwithstanding any other provision of this Agreement, the
definitions set forth in Sections 2(i) and (ii) above regarding "change in
control of the Company" and "potential change in control of the Company" do not
include, and shall not be deemed to include or be applicable to, the merger, or
approval by the Company's shareholders of the merger, contemplated by the
Agreement and Plan of Reorganization dated July 19, 1996, executed by and
between the Company and United Cities Gas Company.

     3.   Termination Following Change in Control.  If any of the events
described in Subsection 2(i) hereof constituting a change of control shall have
occurred, you shall be entitled to the benefits provided in Subsection 4(iii)
hereof upon the subsequent termination of your employment during the term of
this Agreement unless such termination is (A) because of your death, Disability
or Retirement, (B) by the Company for Cause, or (C) by you other than for Good
Reason.

          (i)  Disability; Retirement.  If, as a result of your incapacity due
to physical or mental illness, you shall have been absent from the full-time
performance of your duties with the Company for twelve (12) consecutive months,
and within thirty (30) days after written Notice of Termination (as defined in
Subsection (iv) below) is given you shall not have returned to the full-time
performance of your duties, your employment may be terminated for "Disability."
Termination by the Company or you of your employment based on "Retirement" shall
mean termination in accordance with the Company's retirement policy, including
early retirement, generally applicable to its salaried employees or in
accordance with any retirement arrangement established with your consent with
respect to you.

          (ii)  Cause.  Termination by the Company of your employment for
"Cause" shall mean termination upon (A) the willful and continued failure by you
to substantially perform your duties with the Company (other than any such
failure resulting from your incapacity due to physical or mental illness or any
such actual or anticipated failure after the issuance of a Notice of Termination
by you for Good Reason, as defined in Subsections 3(iv) and 3(iii),
respectively) after a written demand for substantial performance is delivered to
you by the Board, which demand specifically identifies the manner in which the
Board believes that you have not substantially performed your 

                                       3
<PAGE>
 
duties, or (B) the willful engaging by you in conduct which is demonstrably and
materially injurious to the Company, monetarily or otherwise. For purposes of
this Subsection, no act, or failure to act, on your part shall be deemed
"willful" unless done, or omitted to be done, by you not in good faith and
without reasonable belief that your action or omission was in the best interest
of the Company. Notwithstanding the foregoing, you shall not be deemed to have
been terminated for Cause unless and until there shall have been delivered to
you a copy of a resolution duly adopted by the affirmative vote of not less than
three-quarters (3/4) of the entire membership of the Board at a meeting of the
Board called and held for such purpose (after reasonable notice to you and an
opportunity for you, together with your counsel, to be heard before the Board),
finding that in the good faith opinion of the Board you were guilty of conduct
set forth above in clauses (A) or (B) of the first sentence of this Subsection
and specifying the particulars thereof in detail.

          (iii)     Good Reason.  You shall be entitled to terminate your
employment for Good Reason.  For purposes of this Agreement, "Good Reason" shall
mean, without your express written consent, the occurrence after a change in
control of the Company of any of the following circumstances unless, in the case
of Paragraphs (A), (E), (F), (G), or (H), such circumstances are fully corrected
prior to the Date of Termination specified in the Notice of Termination, as
defined in Subsections 3(v) and 3(iv), respectively, given in respect thereof:

               (A) the assignment to you of any duties inconsistent with your
     status as a senior executive officer of the Company or a substantial and
     adverse alteration in the nature or status of your responsibilities from
     those in effect immediately prior to the change in control of the Company;

               (B) a reduction by the Company in your annual base salary as in
     effect on the date hereof or as the same may be increased from time to time
     except for across-the-board salary reductions similarly affecting all
     senior executives of the Company and all senior executives of any person in
     control of the Company;

               (C) the Company's requiring you to be based anywhere other than
     the offices at which you were based immediately prior to the change in
     control of the Company except for required travel on the Company's business
     to an extent substantially consistent with your present business travel
     obligations;

               (D) the failure by the Company, without your consent, to pay to
     you any portion of your current compensation except pursuant to an across-
     the-board compensation deferral similarly affecting all senior executives
     of the Company and all senior executives of any 

                                       4
<PAGE>
 
     person in control of the Company, or to pay to you any portion of an
     installment of deferred compensation under any deferred compensation
     program of the Company, within seven (7) days of the date such compensation
     is due;

               (E)  the failure by the Company to continue in effect any
     compensation plan, in which you participate immediately prior to the change
     in control of the Company which is material to your total compensation,
     including, but not limited to, the Company's Retirement Plan, Employee
     Stock Ownership Plan, Supplemental Executive Benefits Plan and Excess
     Medical Expense Insurance Plan or any substitute plans adopted prior to the
     change in control, unless an equitable arrangement (embodied in an ongoing
     substitute or alternative plan) has been made with respect to such plan, or
     the failure by the Company to continue your participation therein (or in
     such substitute or alternative plan) on a basis not materially less
     favorable, both in terms of the amount of benefits provided and the level
     of your participation relative to other participants, as existed at the
     time of the change in control;

               (F)  the failure by the Company to continue to provide you with
     benefits substantially similar to those enjoyed by you under any of the
     Company's pension, life insurance, medical, health and accident, or
     disability plans in which you were participating at the time of the change
     in control of the Company, the taking of any action by the Company which
     would directly or indirectly materially reduce any of such benefits or
     deprive you of any material fringe benefit enjoyed by you at the time of
     the change in control of the Company, or the failure by the Company to
     provide you with the number of paid vacation days to which you are entitled
     on the basis of years of service with the Company in accordance with the
     Company's normal vacation policy in effect at the time of the change in
     control of the Company;

               (G) the failure of the Company to obtain a satisfactory agreement
     from any successor to assume and agree to perform this Agreement; or

               (H) any purported termination of your employment which is not
     effected pursuant to a Notice of Termination satisfying the requirements of
     Subsection (iv) below (and, if applicable, the requirements of Subsection
     (ii) above); for purposes of this Agreement, no such purported termination
     shall be effective.

Your right to terminate your employment pursuant to this Subsection shall not be
affected by your incapacity due to physical or mental illness.  Your continued
employment shall not constitute consent to, or a waiver of rights with respect
to, any circumstance constituting Good Reason hereunder.

                                       5
<PAGE>
 
          (iv) Notice of Termination.  Any purported termination of your
employment by the Company or by you shall be communicated by written Notice of
Termination to the other party hereto in accordance with Section 7 hereof.  For
purposes of this Agreement, a "Notice of Termination" shall mean a notice which
shall indicate the specific termination provision in this Agreement relied upon
and shall set forth in reasonable detail the facts and circumstances claimed to
provide a basis for termination of your employment under the provision so
indicated.

          (v) Date of Termination, Etc.  "Date of Termination" shall mean (A) if
your employment is terminated for Disability, thirty (30) days after Notice of
Termination is given (provided that you shall not have returned to the full-time
performance of your duties during such thirty (30) day period), and (B) if your
employment is terminated for any reason other than Disability, thirty (30) days
after Notice of Termination is given.

     4.   Compensation Upon Termination or During Disability. Following a change
in control of the Company, as defined by Subsection 2(i), upon termination of
your employment or during a period of disability you shall be entitled to the
following benefits:

          (i) During any period that you fail to perform your full-time duties
with the Company as a result of incapacity due to physical or mental illness,
you shall continue to receive your base salary at the rate in effect at the
commencement of any such period, together with all compensation payable to you
under any disability plan of the Company until this Agreement is terminated
pursuant to Subsection 3(i) hereof.  Thereafter, or in the event your employment
shall be terminated by the Company or by you for Retirement, or by reason of
your death, your benefits shall be determined under the Company's retirement,
insurance and other compensation programs then in effect in accordance with the
terms of such programs.

          (ii)  If your employment shall be terminated by the Company for Cause
or by you other than for Good Reason, Disability, death or Retirement, the
Company shall pay you your full base salary, and continue to provide you with
life, disability, accident, health insurance and other benefits, through the
Date of Termination at the rate in effect at the time Notice of Termination is
given, plus all other amounts to which you are entitled under any compensation
plan of the Company at the time such payments are due, and the Company shall
have no further obligations to you under this Agreement.

          (iii)  If your employment by the Company shall be terminated (a) by
the Company other than for Cause, Retirement, death or Disability or (b) by you
for Good Reason, then you shall be entitled to the benefits provided below

               (A) the Company shall pay you your full base 

                                       6
<PAGE>
 
     salary, and continue to provide you with life, disability, accident, health
     insurance and other benefits, through the Date of Termination at the rate
     in effect at the time Notice of Termination is given, plus all other
     amounts to which you are entitled under any compensation plan of the
     Company, at the time such payments are due, except as otherwise provided
     below;

               (B) in lieu of any further salary payments to you for period
     subsequent to the Date of Termination, the Company shall pay as severance
     pay to you a lump sum severance payment (the "Severance Payment") equal to
     2.99 times your "Base Amount", as defined in Section 280G of the Internal
     Revenue Code of 1986 as amended (the "Code").

               (C) Notwithstanding any other provision of this Agreement, in the
     event that any payment or benefit received or to be received by you in
     connection with a change in control of the Company (whether pursuant to the
     terms of this Agreement or any other plan, arrangement or agreement with
     (i) the Company, (ii) any person whose actions result in a change in
     control of the Company, or (iii) any person affiliated with the Company or
     such person) (all such payments and benefits including the Severance
     Payment, being hereinafter called "Total Payments") would be subject (in
     whole or part), to the excise tax imposed under Section 4999 of the Code
     (the "Excise Tax"), then the Severance Payment shall be reduced to the
     extent necessary so that no portion of the Total Payments is subject to the
     Excise Tax if, and only in the event that, the amount of such Total
     Payments, as so reduced, (and after deduction of the net amount of federal,
     state and local income tax on such reduced Total Payments) is greater than
     the excess of (i) the amount of such Total Payments, without reduction (but
     after deduction of the net amount of federal, state and local income tax on
     such Total Payments), over (ii) the amount of Excise Tax to which you would
     be subject in respect of such Total Payments.  For purposes of determining
     whether and the extent to which the Total Payments will be subject to the
     Excise Tax, (i) no portion of the Total Payments the receipt or enjoyment
     of which you shall have effectively waived in writing prior to the date of
     payment of the Severance Payment shall be taken into account; (ii) no
     portion of the Total Payments shall be taken into account which in the
     opinion of tax counsel selected by the Company's independent auditors does
     not constitute a "parachute payment" within the meaning of Section
     280G(b)(2) of the Code, (including by reason of Section 280G(b)(4)(A) of
     the Code); (iii) in calculating the Excise Tax, no portion of such Total
     Payments shall be taken into account which constitutes reasonable
     compensation for services actually rendered, within the meaning of Section
     280G(b)(4)(B) of the Code, in excess of your base amount (as defined in
     Section 280G(b)(3) of the Code) allocable to such reasonable compensation;
     and (iv) the value of any non-cash benefit or any deferred 

                                       7
<PAGE>
 
     payment or benefit included in the Total Payments shall be determined by
     the Company in accordance with the principles of Sections 280G(d)(3) and
     (4) of the Code; and

               (D) the Company also shall pay to you all legal fees and expenses
     incurred by you as a result of such termination (including all such fees
     and expenses, if any, incurred in contesting or disputing any such
     termination or in seeking to obtain or enforce any right or benefit
     provided by this Agreement or in connection with any tax audit or
     proceeding to the extent attributable to the application of Section 4999 of
     the Code to any payment or benefit provided hereunder) except to the extent
     that the payment of such fees and expenses would not be, or would cause any
     other portion of the Total Payments not to be, deductible by reason of
     Section 280G of the Code.

          (iv) You shall not be required to mitigate the amount of any payment
provided for in this Section 4 by seeking other employment or otherwise, nor
shall the amount of any payment or benefit provided for in this Section 4 be
reduced by any compensation earned by you as the result of employment by another
employer, by retirement benefits, by offset against any amount claimed to be
owed by you to the Company, or otherwise except as specifically provided in this
Section 4.

          (v) In addition to all other amounts payable to you under this Section
4, you shall be entitled to all rights and benefits provided to you under the
terms of any other plan or agreement between you and the Company.

     5.   Letter of Credit Preceding Termination.  In the event a potential
change in control of the Company shall have occurred, the Company will promptly
(and in no event more than seven (7) days thereafter) establish an irrevocable
letter of credit (the "Letter of Credit") in your favor in an amount equal to
the amount which would be payable to you pursuant to Subsection 4(iii) hereof as
if you were immediately entitled to payment pursuant thereto, such Letter of
Credit to be issued by a commercial bank which is not an affiliate of the
Company, but which is a national banking association or established under the
laws of one of the states of the United States, and which has equity in excess
of $100 million (the "Bank").  The Letter of Credit shall be in form and
substance reasonably satisfactory to you and the Company and will provide that
the Bank shall pay you the amount of your draft, at sight, on presentation to
the Bank of a statement, signed by you or your authorized representative,
setting forth (i) a statement that pursuant to Subsection 4(iii) of this
Agreement, you are entitled to payments of not less than the amount of such
draft, and (ii) the Date of Termination of your employment.  Each time you shall
draw on the Letter of Credit, you shall provide the Company with a copy of such
draft and the accompanying statement referred to above.  The Company shall
maintain the Letter of Credit in effect for a period of two 

                                       8
<PAGE>
 
years from the date on which it is issued; provided, however, that (i) if during
any such two-year period any event shall occur which, pursuant to this Section
5, would have required the Company to establish a Letter of Credit had none then
existed, then the Company shall maintain the Letter of Credit in effect for a
period of two years following such event, unless further extended pursuant to
this provision, and (ii) if a change in control of the Company shall occur, then
the Company shall maintain the Letter of Credit in effect for a period of three
years following such change in control. During the period in which a Letter of
Credit is required to be maintained, the Company shall, at six-month intervals
commencing with the date the Letter of Credit is established, calculate the
amount which would be payable to you pursuant to Subsection 4(iii) hereof as if
you were immediately entitled to payment pursuant thereto. If the amount exceeds
the amount available to be drawn upon under the Letter of Credit then in effect,
the Company shall promptly (and in no event later than seven (7) days
thereafter) cause the amount payable under the Letter of Credit to be increased
by the amount of such excess.

     The payment by the Bank of the amount of your draft in accordance with the
terms hereof and of the Letter of Credit shall not constitute a waiver by the
Company of, or in any way preclude the Company from asserting, any claim against
you that you are not entitled to some or all of such payment.  In addition, your
drawing upon the Letter of Credit shall not constitute a waiver by you, or in
any way preclude you from asserting, any claim against the Company that you are
entitled to amounts pursuant to this Agreement which were not paid by amounts
received under the Letter of Credit.

     6.   Successors; Binding Agreement.  (i)  The Company will require any
successor (whether direct or indirect, by purchase, merger, consolidation or
otherwise) to all or substantially all of the business and/or assets of the
Company to expressly assume and agree to perform this Agreement in the same
manner and to the same extent that the Company would be required to perform it
if no such succession had taken place.  Failure of the Company to obtain such
assumption and agreement prior to the effectiveness of any such succession shall
be a breach of this Agreement and shall entitle you to compensation from the
Company in the same amount and on the same terms as you would be entitled to
hereunder if you terminate your employment for Good Reason following a change in
control of the Company, except that for purposes of implementing the foregoing,
the date on which any such succession becomes effective shall be deemed the Date
of Termination.  As used in this Agreement, "Company" shall mean the Company as
hereinbefore defined and any successor to its business and/or assets as
aforesaid which assumes and agrees to perform this Agreement by operation of
law, or otherwise.

          (ii) This Agreement shall inure to the benefit of and be enforceable
by your personal or legal representatives, 

                                       9
<PAGE>
 
executors, administrators, successors, heirs, distributees, devisees and
legatees. If you should die while any amount would still be payable to you
hereunder if you had continued to live, all such amounts, unless otherwise
provided herein, shall be paid in accordance with the terms of this Agreement to
your devisee, legatee or other designee or, if there is no such designee, to
your estate.

     7.   Notice.  For the purpose of this Agreement, notices and all other
communications provided for in the Agreement shall be in writing and shall be
deemed to have been duly given when delivered or mailed by United States
registered mail, return receipt requested, postage prepaid, addressed to the
respective addresses set forth on the first page of this Agreement, provided
that all notice to the Company shall be directed to the attention of the Board
with a copy to the Secretary of the Company, or to such other address as either
party may have furnished to the other in writing in accordance herewith, except
that notice of change of address shall be effective only upon receipt.

     8.   Miscellaneous.  No provision of this Agreement may be modified,
waived, or discharged unless such waiver, modification or discharge is agreed to
in writing and signed by you and such officer as may be specifically designated
by the Board.  No waiver by either party hereto at any time of any breach by the
other party hereto of, or compliance with, any condition or provision of this
Agreement to be performed by such other party shall be deemed a waiver of
similar or dissimilar provisions or conditions at the same or at any prior or
subsequent time.  No agreements or representations, oral or otherwise, express
or implied, with respect to the subject matter hereof have been made by either
party which are not expressly set forth in this Agreement.  The validity,
interpretation, construction and performance of this Agreement shall be governed
by the laws of the State of Texas.  All references to sections of the Exchange
Act or the Code shall be deemed also to refer to any successor provisions to
such sections.  Any payments provided for hereunder shall be paid net of any
applicable withholding required under federal, state or local law.  The
obligations of the Company under Section 4 shall survive the expiration of the
term of this Agreement.

     9.   Validity.  The invalidity or unenforceability of any provision of this
Agreement shall not affect the validity or enforceability of any other provision
of this Agreement, which shall remain in full force and effect.

     10.  Counterparts.  This Agreement may be executed in several counterparts,
each of which shall be deemed to be an original but all of which together will
constitute one and the same instrument.

     11.  Arbitration.  Any dispute or controversy arising under or in
connection with this Agreement shall be settled exclusively 

                                       10
<PAGE>
 
by arbitration in Dallas, Texas in accordance with the rules of the American
Arbitration Association then in effect. Judgment may be entered on the
arbitrator's award in any court having jurisdiction; provided, however, that you
shall be entitled to seek specific performance of your right to be paid until
the Date of Termination during the pendency of any dispute or controversy
arising under or in connection with this Agreement.

     If this letter sets forth our agreement on the subject matter hereof,
kindly sign and return to the Company the enclosed copy of this letter which
will then constitute our agreement on this subject.

                                    Sincerely,

                                    ATMOS ENERGY CORPORATION



                                    By   /s/ Robert W. Best
                                      ----------------------
                                      Robert W. Best
                                      Chairman of the Board, President and
                                      Chief Executive Officer



Agreed to this 14th
day of May, 1997.



/s/ Larry J. Dagley
- -----------------------
Larry J. Dagley

                                       11

<PAGE>
 
                                                                Exhibit 10.25(b)

                                                                   Date Revised:
                                                                 August 13, 1997



                            ATMOS ENERGY CORPORATION

                           FINANCIAL PLANNING PROGRAM


I.   ELIGIBILITY

     This financial planning program is available to all Corporate Officers and
     operating company Presidents.

II.  PROVISIONS

A.        The firm of Ernst and Young has been selected to provide all financial
          planning activities, and income tax preparation services.

B.        The company will pay all fees associated with the financial planning
          activities described below.

C.        The company will pay all fees associated with the preparation of the
          individual's federal and state income tax return up to a maximum of
          $2,000 per individual per year.

D.        Fees for services rendered to a specific individual are includable as
          income.  However, most all fees would be deductible subject to IRS
          limitations for itemized deductions.

E.        Billing for services rendered will be sent to the Vice President,
          Human Resources for recordkeeping and payment.

F.        The company will not pay for financial planning or income tax
          preparation services rendered by any firm except Ernst and Young.

<PAGE>
 
                                                                Exhibit 10.26(a)

                               AMENDMENT NO. 1 TO
                          THE ATMOS ENERGY CORPORATION
                      SUPPLEMENTAL EXECUTIVE BENEFITS PLAN

     THIS AMENDMENT NO. 1 TO THE ATMOS ENERGY CORPORATION SUPPLEMENTAL EXECUTIVE
BENEFITS PLAN (the "Amendment") is effective this 13th day of August, 1997.

     WHEREAS, ATMOS ENERGY CORPORATION (the "Company") has heretofore adopted
The Atmos Energy Corporation Supplemental Executive Benefits Plan (the "Plan")
which was last amended and restated in its entirety on May 14, 1997; and

     WHEREAS, pursuant to Section 9.1 of the Plan which permits the Company to
amend the Plan from time to time, the Company desires to amend the Plan in
certain respects as hereinafter provided.
 
     NOW, THEREFORE, the Company does hereby amend the Plan in the following
respects:
 
     Section 2.1(e)(iii) of the Plan which defines one component of the term
"Compensation" for purposes of the Plan is hereby amended to read in its
entirety as follows:

     "(iii)  The Participant's annual car allowance at the date of his
     termination of employment, or in the event the Participant is provided a
     Company car in lieu of an annual car allowance, that amount equivalent to
     the annual car allowance provided by the Company to a person who is a Vice
     President of the Company at the time of the Participant's termination of
     employment."

     IN WITNESS WHEREOF, the Company has caused this AMENDMENT NO. 1 TO THE
ATMOS ENERGY CORPORATION SUPPLEMENTAL EXECUTIVE BENEFITS PLAN to be executed in
its name and on its behalf this 13th day of August, 1997.


                                    ATMOS ENERGY CORPORATION


                                    By:  /s/ Robert W. Best
                                       -----------------------
                                         Robert W. Best,
                                    Chairman, President and CEO

<PAGE>
 
                                                                Exhibit 10.26(b)

                                AMENDMENT NO. 2
                                       TO
                          THE ATMOS ENERGY CORPORATION
                      SUPPLEMENTAL EXECUTIVE BENEFITS PLAN
              Amended and Restated in its Entirety:  May 14, 1997

     This Amendment No. Two to The Atmos Energy Corporation Supplemental
Executive Benefits Plan Amended and Restated in its Entirety (the "Plan"),
effective as of May 14, 1997, amends the Plan pursuant to the provisions of
Section 9.1 of the Plan as follows:

     Section 7.1 is amended by striking the introductory sentence of said
     Section and substituting the following:

          "A Participant shall be entitled to a Death Benefit if he meets the
          requirements of either (a) or (b) or (c) as follows:"

     Section 7.1 is further amended by adding a new subsection (c) as follows:

          "(c)  He is entitled to a Supplemental Pension pursuant to the
          provisions of Subsection 5.1(b) or Subsection 5.5(a) of this Plan, but
          dies before the commencement of his Supplemental Pension."

     Section 7.2 is amended by adding a new subsection (c) as follows:

          "(c)  Deferred Retirement Death.  In the case of a Participant who
          dies as provided in Subsection 7.1(c), a Death Benefit will be paid as
          provided in (i) or (ii) as follows:

                In the case of a Participant who dies prior to reaching age 55,
                to the beneficiary (determined as of the Participant's date of
                death) and in the amount that would have been applicable had the
                Participant lived to age 55, commenced his Supplemental Pension
                in the month immediately following the month in which he reached
                age 55 and died immediately after his Supplemental Pension
                commenced.

                In the case of a Participant who dies after reaching age 55, in
                the amount and to the beneficiary that would have been
                applicable had the Participant's Supplemental Pension commenced
                in the month of his death."

     Section 7.4 is amended by striking said Section and substituting in lieu
     thereof the following:
<PAGE>
 
          "Section 7.4.  Commencement of Death Benefits:

          The Death Benefits payable pursuant to Subsection 7.2(a) shall be
          paid, with respect to the Lump Sum Death Benefit, or shall commence,
          with respect to the Monthly and Dependent Death Benefits, as of the
          first day of the month next following the Participant's death.

          The Death Benefits payable pursuant to Subsections 7.2(b) and (c)
          shall commence as of the first day of the month next following the
          Participant's death, except in the case of the Death Benefit payable
          pursuant of Subsection 7.2(c)(i) which, unless earlier commencement is
          elected as provided below, shall commence as of the first day of the
          month following the month in which the Participant would have reached
          age 55.  At the beneficiary's option, the Death Benefit payable under
          Subsection 7.2(c)(i) may commence on the first day of any month
          following the Participant's death.  The earlier benefit to be paid
          shall be the actuarial equivalent of the benefit that would have been
          payable at the Participant's attainment of age 55, as determined under
          Subsection 7.2(c)(i).  For purposes of this paragraph, an "actuarial
          equivalent" benefit shall be determined based upon an interest rate of
          8.0% per annum and the 'IRS Applicable Table" as prescribed under
          Internal Revenue Code Section 417(e)(3)(A)(ii)(I).

          If the beneficiary entitled to receive the Death Benefits payable
          pursuant to Sections 7.2(b) or (c) is the Participant's surviving
          spouse and such spouse dies before commencement of the payment of
          these Death Benefits as provided in paragraph (b) above, then no Death
          Benefits shall be payable under Subsection 7.2(b) or (c)."

     Executed this 12th day of November, 1997, effective as of the date set
     forth herein.


                              ATMOS ENERGY CORPORATION


                              By:  /s/ Robert W. Best
                                  -------------------------
                                 Robert W. Best,
                                 Chairman, President and CEO

                                       2

<PAGE>
 
                                                                   Exhibit 10.27



                           Atmos Energy Corporation

                          Restricted Stock Grant Plan







Effective October 1, 1987
Amended and Restated as of November 12, 1997
<PAGE>
 
                            ATMOS ENERGY CORPORATION
                          RESTRICTED STOCK GRANT PLAN
                 (Amended and Restated as of November 12, 1997)


I.   Purpose of Plan

     The Atmos Energy Corporation Restricted Stock Grant Plan (the "Plan") has
     been established to align the interests of its participants more directly
     with those of the Company's shareholders, to retain and attract managerial
     and professional personnel of exceptional ability and to encourage strong
     commitment to corporate objectives.

II.  Plan Definitions

     All rights and conditions under the Plan are specified in the following
     paragraphs subject to compliance with applicable laws and regulations.  As
     used in the Plan, the following terms and phrases shall have the meanings
     ascribed to them below:

     A.   "Board" or "Board of Directors" shall mean the Board of Directors of
          Atmos Energy Corporation.

     B.   "Common Stock" shall mean the common stock of Atmos Energy
          Corporation.

     C.   "Company" shall mean Atmos Energy Corporation.

     D.   "Disability" shall mean such total and permanent disability as
          qualifies the participant for benefits under the Company's Long-Term
          Disability Plan covering the participant at the time.

     E.   "Exchange Act" shall mean the Securities Exchange Act of 1934.

     F.   "Fair Market Value" with regard to the Restricted Stock on a
          particular date shall mean the closing price of a share of Common
          Stock as reported by the New York Stock Exchange-Composite
          Transactions on that date.  However, if no trading in the Common Stock
          occurs on the New York Stock Exchange on that date, the "Fair Market
          Value" shall mean the closing price as reported on the immediately
          preceding date.  In the event the Common Stock is traded on an
          exchange other than the New York Stock Exchange, the Board of
          Directors shall select a suitable substitute published stock quotation
          system, which system shall be in compliance with all relevant
          regulatory provisions.

     G.   "Subsidiary" shall mean any direct or indirect subsidiary of Atmos
          Energy Corporation.

III. Eligibility

                                       2
<PAGE>
 
     The participants in the Plan shall be such employees of the Company or any
Subsidiary as may be selected from time to time by the Board in its discretion.
Directors of the Company who are not also employees of the Company shall not be
eligible to participate in the Plan. In order to receive Restricted Stock,
participants must not, at the time the grant of Restricted Stock is made, be
subject to any agreement with the Company that restricts the acquisition of
shares of Common Stock.

IV.  Stock Subject to Plan

     The stock subject to the Plan shall consist of shares of Common Stock to
which the restrictions specified in Section V.F. are attached. This stock is
hereafter referred to as "Restricted Stock".  The total number of shares of
Restricted Stock, subject to adjustment as provided in Section XII, that may be
awarded by the Company under the Plan shall not be more than 900,000 shares.
Restricted Stock awarded under the Plan shall, in the sole discretion of the
Board of Directors, consist of either previously issued shares purchased on the
open market or shares purchased from the Company as original issue shares or
treasury shares.

V.   Terms and Conditions of Restricted Stock Awards

     Each share of Restricted Stock awarded under the Plan shall be subject to
the following restrictions:

     A.   Shares of Restricted Stock awarded to a Plan participant may not be
          sold, transferred, pledged, hypothecated, encumbered, or otherwise
          alienated in any manner, whether voluntarily, by operation of law, or
          otherwise, until the restrictions on such shares are removed pursuant
          to the Plan and said shares are delivered to the participant.

     B.   Shares of Restricted Stock awarded to a Plan participant will be
          forfeited if, prior to the removal of restrictions on the Restricted
          Stock awarded hereunder, the recipient terminates employment for any
          reason other than death, disability, or retirement.

     C.   At the time and on the date of a participant's death, disability, or
          retirement (upon or after attaining the age of 62) while employed by
          the Company  or Subsidiary, all restrictions placed on each share of
          Restricted Stock awarded to that participant shall be removed and such
          shares shall be delivered to the participant or to his legal
          representatives, beneficiaries, or heirs.  From and after such date,
          the participant or the participant's estate, personal representative
          or beneficiary, as the case may be, shall have full rights of transfer
          or resale with respect to such stock subject to applicable state and
          federal regulations.  The restrictions on shares of 

                                       3
<PAGE>
 
          Restricted Stock awarded to a participant shall not be removed due to
          the participant's retirement prior to attaining the age of 62, unless
          such removal is expressly approved by the Board of Directors.

     D.   Stock certificates representing the number of shares of Restricted
          Stock granted to an employee of the Company or Subsidiary shall be
          registered in the employee's name, but the certificates representing
          any shares of Restricted Stock shall be held in the custody of the
          Company for the participant's account.  All dividends and
          distributions (other than stock dividends and distributions) on shares
          held in the custody of the Company shall be paid to the participant,
          however, regardless of the fact that the shares are being held in
          behalf of the participant.  Any new, additional, or different shares
          or securities issued (due to a stock split, stock dividend, or other
          stock distribution) with respect to Restricted Stock previously
          awarded under the Plan shall be held by the Company as Restricted
          Stock for the participant's account and shall have the same
          restrictions as the underlying Restricted Stock with respect to which
          such new, additional, or different shares or securities were issued.
          At such time as restrictions are removed from any portion of the
          Restricted Stock held by the Company for the participant, certificates
          representing such shares shall be delivered free of all restrictions
          to the participant or to the participant's legal representatives,
          beneficiaries, or heirs.

     E.   Additional grants of Restricted Stock to a participant after the
          initial grant to such participant may have restriction provisions
          different from those provided in Section VI.  If such is the case, the
          award of such stock will be conditioned upon the acceptance by the
          participant of such different provisions.

     F.   Each certificate issued in respect of shares of Restricted Stock
          granted to a participant under the Plan shall bear the following, or
          similar legend:

               "The transferability of this certificate and the shares of stock
               represented hereby are subject to the terms and conditions
               (including forfeitures) contained in the Atmos Energy Corporation
               Restricted Stock Grant Plan. A copy of the Plan is on file in the
               office of Atmos Energy Corporation, 1800 Three Lincoln Centre,
               5430 LBJ Freeway, Dallas, Texas 75240."


VI.  Removal of Restrictions

                                       4
<PAGE>
 
     A participant who receives a Restricted Stock award pursuant to the Plan
shall be entitled to delivery of shares free and clear of all restrictions, if
such participant is an employee of the Company or Subsidiary at the time
(subject to the provisions of Sections V.C. and V.E. herein), according to the
following schedule:

                                                 Percentage of Original
           Completed Years of Service                 Grant Delivered
             After Date of Grant                       to Participant

                     3                                       25%
                     4                                       25%
                     5                                       25%
                     6                                       25%

     Notwithstanding the foregoing provisions, each participant shall, in the
event of a Change of Control of the Company, receive free of restriction all
Restricted Stock granted to the participant on or before the effective date of
such Change of Control.  As used in the Plan, a "Change in Control" of the
Company shall be deemed to have occurred if:

     (A)  Any "Person" (as defined in subparagraph (ii) below), other than (1)
          the Company or any Subsidiary, (2) a trustee or other fiduciary
          holding securities under an employee benefit plan of the Company or
          any of its affiliates, as defined in Rule 12b-2 promulgated under
          Section 12 of the Exchange Act ("Affiliates"), (3) an underwriter
          temporarily holding securities pursuant to an offering of such
          securities, or (4) a corporation owned, directly or indirectly, by the
          shareholders of the Company, in substantially the same proportions as
          their ownership of stock of the Company, who is or becomes the
          "beneficial owner" (as defined in subparagraph (ii) below), directly
          or indirectly, of securities of the Company (not including in the
          securities beneficially owned by such person any securities acquired
          directly from the Company or its Affiliates) representing 33-1/3% or
          more of the combined voting power of the Company's then outstanding
          securities, or 33-1/3% or more of the then outstanding common stock of
          the Company, excluding any Person who becomes such a beneficial owner
          in connection with a transaction described in subparagraph (C)(1)
          below.

     (B)  During any period of two consecutive years (the "Period"), individuals
          who at the beginning of the Period constitute the Board of the Company
          and any "new director" (as defined in subparagraph (ii) below) cease
          for any reason to constitute a majority of the Board.

     (C)  There is consummated a merger or consolidation of the Company or any
          Subsidiary with any other corporation, except if:

                                       5
<PAGE>
 
          (i)  the merger or consolidation would result in the voting securities
               of the Company outstanding immediately prior thereto continuing
               to represent (either by remaining outstanding or by being
               converted into voting securities of the surviving entity or any
               parent thereof) at least 60% of the combined voting power of the
               voting securities of the Company or such surviving entity or any
               parent thereof outstanding immediately after such merger or
               consolidation; or

               the merger or consolidation is effected to implement a
               recapitalization of the Company (or similar transaction) in which
               no Person is or becomes the beneficial owner, directly or
               indirectly, of securities of the Company (not including in the
               securities beneficially owned by such Person any securities
               acquired directly from the Company or its Affiliates other than
               in connection with the acquisition by the Company or its
               Affiliates of a business) representing 60% or more of the
               combined voting power of the Company's then outstanding
               securities.

     (D)  The shareholders of the Company approve a plan of complete liquidation
          or dissolution of the Company or an agreement for the sale or
          disposition by the Company of all or substantially all the Company's
          assets, other than a sale or disposition by the Company of all or
          substantially all of the Company's assets to an entity, at least 60%
          of the combined voting power of the voting securities of which are
          owned by the stockholders of the Company in substantially the same
          proportions as their ownership of the Company immediately prior  to
          such sale.

          (ii) For purposes of subparagraph (i) above,

               (A)  "Person" shall have the meaning given in Section 3(a)(9) of
               the Exchange Act, as modified and used in Sections 13(d) and
               14(d) of the Exchange Act.

               "Beneficial owner" shall have the meaning provided in Rule 13d-3
               under the Exchange Act.

               "New director" shall mean an individual whose election by the
               Company's Board or nomination for election by the Company's
               shareholders was approved by a vote of at least 2/3's of the
               directors then still in office who either were directors at the
               beginning of the Period or whose election or nomination for
               election was previously so approved or recommended. However, "new
               director" shall not include a director whose 

                                       6
<PAGE>
 
               initial assumption of office is in connection with an actual or
               threatened election contest, including but not limited to a
               consent solicitation relating to the election of directors of the
               Company.

VII. Stock Withholding Requirement

     Upon the removal or lapse of the restrictions on any Restricted Stock
awarded to a participant, the number of shares issuable by the Company to the
participant shall be subject to applicable withholding requirements for income
and employment taxes arising from the removal or lapse of the restrictions on
the Restricted Stock.

VIII. Forfeited Shares

     If shares of Restricted Stock are forfeited according to the terms of the
Plan, the number of shares forfeited may be added back to the number of shares
available for issuance under the Plan.  Any shares of Restricted Stock that are
forfeited according to the terms of the Plan shall be held by the Company as
treasury shares and shall be available for reissuance under the Plan.

IX.  Rights of Recipients as Shareholders

     Except as otherwise provided in the Plan, a recipient of a Restricted Stock
grant under the Plan shall have all of the rights of a shareholder of the
Company with respect to such shares of Restricted Stock, including the right to
vote such shares and receive the dividends and other distributions paid or made
with respect to such shares in accordance with Section V.D. above.

X.   Administration of the Plan

     The Board shall have full authority to manage and control the operation and
administration of the Plan.  Any action taken by the Board with respect to the
Plan shall be taken upon the affirmative vote of a majority of the directors.
The Board shall have the power to construe and interpret the Plan in accordance
with its terms and to establish and amend the rules and regulations for its
administration.  All determinations of the Board shall be final and shall not be
subject to appeal.  The Board shall designate those employees of the Company and
its Subsidiaries who are eligible to participate in the Plan subject to the
provisions of Section III and shall designate the amounts of Restricted Stock to
be granted.

XI.    Amendment and Termination

     The Board in its discretion may terminate the Plan at any time with respect
to any shares of Restricted Stock which have not theretofore been granted.  The
Board shall have the right to 

                                       7
<PAGE>
 
alter or amend the Plan or any part thereof from time to time; provided, that no
change in any Restricted Stock theretofore granted may be made which would
impair the rights of the grantee without the consent of such grantee; and
provided, further, that the Board may not make any alteration or amendment which
would materially increase the benefits accruing to participants under the Plan,
materially increase the aggregate number of shares which may be issued pursuant
to the provisions of the Plan, change the class of employees eligible to receive
grants under the Plan, withdraw the administration of the Plan from the Board or
permit any non-employee member of the Board to be eligible to receive a grant
under the Plan without the approval of the stockholders of the Company.

XII. Adjustment Upon Changes in Stock

     If there shall be any change in the number of shares of Common Stock
subject to the Plan or to any Restricted Stock granted thereunder, through
subdivision, combination, or reclassification of shares, or through merger,
consolidation, reorganization, recapitalization, stock dividend, stock split or
other change in the corporate structure, appropriate adjustment shall be made by
the Board in the aggregate number of shares subject to the Plan.

XIII. No Employment Rights

     The adoption of the Plan does not confer upon any employee of the Company
or a Subsidiary any right to continue employment with the Company or Subsidiary,
as the case may be, nor does it interfere in any way with the right of the
Company or a Subsidiary to terminate the employment of any of its employees at
any time.

     IN WITNESS WHEREOF, and as conclusive evidence of its adoption of this
Amended and Restated Restricted Stock Grant Plan, the Company has caused this
Plan to be duly executed on this 12/th/ day of November, 1997.

                         ATMOS ENERGY CORPORATION

 
                         By:  /s/ Robert W. Best
                             -----------------------------
                              Robert W. Best
                              Chairman, President and
                              Chief Executive Officer

                                       8

<PAGE>
 
                                                                   Exhibit 10.28



                            Atmos Energy Corporation

                      Outside Directors Stock-for-Fee Plan



Effective February 8, 1995
Amended and Restated as of November 12, 1997
<PAGE>
 
                            Atmos Energy Corporation
                      Outside Directors Stock-for-Fee Plan
                 (Amended and Restated as of November 12, 1997)


I.    Plan Purpose

      Section 1.1.  Atmos Energy Corporation ("Atmos" or the "Company") hereby
      establishes the Atmos Energy Corporation Outside Directors Stock-for-Fee
      Plan (the "Plan"), which provides the non-employee directors of Atmos the
      option to receive all or part of their Fees (as defined below) in Atmos
      common stock.  The purpose of this Plan is to increase the proprietary
      interest of the Outside Directors in the Company's long-term prospects and
      the strategic growth of its business.

II.   Definitions

      Section 2.1.  "Board" or "Board of Directors" shall mean the Board of
      Directors of Atmos Energy Corporation.

      Section 2.2.  "Common Stock" means the Company's no par value common
      stock.

      Section 2.3.     "Election" means an Outside Director's delivery of
      written notice of election to the Corporate Secretary of the Company
      electing to receive his or her Fees or a portion thereof in the form of
      Common Stock.

      Section 2.4.  "Fair Market Value" means, as of any specified date, the
      closing price of a share of Common Stock of the Company as reported by the
      New York Stock Exchange-Composite Transactions on that date.  However, if
      no trading in the Common Stock occurs on the New York Stock Exchange on
      that date, the "Fair Market Value" shall mean the closing price as
      reported on the immediately preceding date.  In the event the Common Stock
      is traded on an exchange other than the New York Stock Exchange, the Board
      of Directors shall select a suitable substitute published stock quotation
      system, which system shall be in compliance with all relevant regulatory
      provisions.

      Section 2.5.  "Fees" means the annual retainer (paid in quarterly
      installments) and meeting fees earned by an Outside Director for his or
      her service as a member of the Atmos Board of Directors during a Fiscal
      Year or portion thereof.

                                       2
<PAGE>
 
      Section 2.6.  "Fiscal Year" means the 12-month period beginning October
      1/st/ of any year and ending September 30th of the next year.

      Section 2.7.  "Outside Director" means a member of the Company's Board of
      Directors who is not an employee of the Company.

      Section 2.8.  "Quarter" means the 3-month period beginning October 1,
      January 1, April 1, or July 1 of each Fiscal Year.

III.  Shares Authorized for Issuance

      Section 3.1.  A maximum of 50,000 shares of Common Stock may be issued
      under the Plan.  The Common Stock issued under the Plan may, at the option
      of the Board of Directors, be either original issue by the Company or
      purchased on the open market.  In the event of any change in the number of
      shares  outstanding of Common Stock by reason of a stock split, stock
      dividend, merger, consolidation, reorganization, or other similar change
      in capitalization, the number or kind of shares that may be issued under
      the Plan shall be automatically adjusted so that the proportionate
      interest of the shares issuable under the Plan is maintained as before the
      occurrence of such event.

IV.   Administration

      Section 4.1.  Each Outside Director may elect to receive all or a portion
      (in 25% increments) of his or her Fees in shares of Common Stock by
      executing and delivering an election form to the Corporate Secretary of
      the Company at least two weeks prior to the beginning of the Quarter in
      order to be effective for Fees earned in that Quarter.  Each Outside
      Director must execute the election form previously approved by the
      Corporate Secretary in order for such Election to be effective.  The
      election form is deemed delivered when received by the Corporate
      Secretary.

      Section 4.2.  An Outside Director making an Election may designate a
      beneficiary or beneficiaries who will receive any shares of Common Stock
      owed to such Outside Director hereunder in the event of the Outside
      Director's death.

      Section 4.3.  Each Outside Director may revoke or modify his or her
      Election that is then currently in effect by executing and delivering a
      written revocation/modification form, which must be delivered to the
      Corporate Secretary at least two weeks prior 

                                       3
<PAGE>
 
      to the beginning of the immediately succeeding Quarter, in order to be
      effective for Fees earned in that Quarter. This form is deemed delivered
      when received by the Corporate Secretary. In addition, each Outside
      Director may make changes in the designation of a beneficiary at any time.

      Section 4.4.  An Election shall result in the deferral of the Common Stock
      portion of the payment of the Fees earned in each Quarter for which the
      Election is effective until the end of each such Quarter.  Shares of
      Common Stock shall be issued to the Outside Director as soon as possible
      following the last business day of each such Quarter.  The number of
      shares of Common Stock issued in accordance with an Election shall be
      equal to the amount of Fees that would have been paid to the Outside
      Director during a Quarter divided by the Fair Market Value on the last
      business day of such Quarter.  Only whole numbers of shares of Common
      Stock shall be issued; fractional shares shall be paid in cash.  If the
      Election is for only a portion of the Fees, the remaining portion of the
      Fees to be paid in cash shall be paid at the time the cash payment would
      normally be paid by the Company to the Outside Director.

      Section 4.5.  The Board of Directors shall be responsible for the
      administration of the Plan.  The Board of Directors, by majority action of
      its members, is authorized to interpret the Plan, prescribe, amend, and
      rescind rules and regulations relating to the Plan, provide for conditions
      and assurances deemed necessary or advisable to protect the interests of
      the Company, and make all other determinations necessary or advisable for
      the administration of the Plan, but only to the extent not contrary to the
      express provisions of the Plan. No member of the Board of Directors shall
      be liable for any action or determination made in good faith. The
      determinations, interpretations, and other actions of the Board of
      Directors pursuant to the provisions of the Plan shall be binding and
      conclusive for all purposes and on all persons.

V.    Effective Date

      Section 5.1.  The Plan, as originally drafted, was approved and adopted by
      a vote of  the shareholders of the Company on February 8, 1995 and became
      effective immediately upon such approval.

                                       4
<PAGE>
 
VI.   Amendment and Termination

      Section 6.1.  The Board of Directors of the Company may at any time
      terminate, and from time to time may amend or modify the Plan, provided,
      however, that no amendment or modification may become effective without
      approval by the shareholders of the Company if shareholder approval is
      required to enable the Plan to satisfy any applicable statutory or
      regulatory requirements or if the Board of Directors, on advice of
      counsel, determines that shareholder approval is otherwise necessary or
      advisable.


      IN WITNESS WHEREOF and as conclusive evidence of its adoption of this
Amended and Restated Directors Stock-for-Fee Plan, the Company has caused this
Plan to be duly executed this 12th day of November, 1997.

                              ATMOS ENERGY CORPORATION



                              By:  /s/ Robert W. Best
                                 -----------------------
                                  Robert W. Best
                                  Chairman, President and
                                  Chief Executive Officer
 

                                       5

<PAGE>
 
                                                                   Exhibit 10.31



                          THE ATMOS ENERGY CORPORATION

                          EXECUTIVE RETIREE LIFE PLAN



                        Effective Date: November 9, 1994
<PAGE>
 
                               TABLE OF CONTENTS
 
Article                                                 Page
 
 ARTICLE I     Purpose and Effective Date                  1
               Section 1.1. Purpose                        1
               Section 1.2. Effective Date                 1
 
ARTICLE II     Definitions and Construction                1
               Section 2.1. Definitions                    1
               Section 2.2. Construction                   2
               Section 2.3. Governing Law                  2
 
ARTICLE III    Eligibility and Participation               2
               Section 3.1. Employees Eligible
                      to Participate                       2
 
ARTICLE IV     Assets Used for Benefits                    2
               Section 4.1. Amounts Provided
                      by the Employer                      2
 
ARTICLE V      Death Benefits                              3
               Section 5.1. Eligibility For
                     Death Benefits                        3
               Section 5.2. Amount of Death Benefit        3
               Section 5.3. Form of Payment and
                     Beneficiary of Death Benefit          4
               Section 5.4. Payment of Death Benefits      4
 
 
ARTICLE VI     Administration                              4
               Section 6.1. Plan Administrator             4
               Section 6.2. Powers of Plan
                     Administrator                         4
 
ARTICLE VII    Miscellaneous Provisions                    5
               Section 7.1. Amendment or Termination
                     of the Plan                           5
               Section 7.2. Nonguarantee of Employment     5
               Section 7.3. Nonalienation of Benefits      6
               Section 7.4. Liability.                     6
               Section 7.5. Successors to the Employer     6

                                       2
<PAGE>
 
                         THE ATMOS ENERGY CORPORATION
                          EXECUTIVE RETIREE LIFE PLAN

                                   ARTICLE I
                          Purpose and Effective Date

     Section 1.1.   Purpose: The purpose of this Plan is to provide death
benefits for retired corporate officers of Atmos Energy Corporation.

     Section 1.2.   Effective Date: The Plan shall become effective on November
9, 1994.


                                   ARTICLE II

                          Definitions and Construction

     Section 2.1.   Definitions:

(a)       Beneficiary: The person or persons entitled to receive the Death
          Benefit in accordance with Section 5.3 of this Plan.

(b)       Death Benefit: The benefit provided under Article V of this Plan upon
          the death of a Participant, which benefit is calculated in this Plan
          on a pre-tax basis.

(c)       Employer: Atmos Energy Corporation.

(d)       Life Plan: The Group Life Insurance Plan for Employees of Atmos Energy
          Corporation, as in effect from time to time.

(e)       Participant: An eligible corporate officer of the Employer who retires
          and meets the requirements to participate in the Plan in accordance
          with the provisions of Article III hereof.

(f)       Plan: The Atmos Energy Corporation Executive Retiree Life Plan, as set
          forth herein and as amended from time to time.

(g)       Plan Administrator: The Vice President, Human Resources of the
          Employer.

(h)       Plan Year: Each twelve (12) month period beginning on January 1 and
          ending on December 31, except that the first Plan Year shall be a
          short year beginning on November 9, 1994 and ending on December 31,
          1994.

     Section 2.2.   Construction: The masculine gender, whenever appearing in
this Plan, shall be deemed to include the feminine gender; the singular may
include the plural; and vice versa, unless the context clearly indicates to the
contrary.

                                       3
<PAGE>
 
     Section 2.3. Governing Law: This Plan shall be construed in accordance with
and governed by the laws of the State of Texas, except to the extent otherwise
preempted by the Employee Retirement Income Security Act of 1974, as amended, or
any other Federal law.


                                  ARTICLE III

                         Eligibility and Participation

     Section 3.1.   Employees Eligible to Participate: Any employee who retires
from the employ of the Employer on or after September 30, 1994 and on or after
attaining age 55 and who, immediately prior to his retirement, is a corporate
officer of the Employer shall be eligible to participate in this Plan and shall
become a Participant upon his retirement.


                                   ARTICLE IV

                            Assets Used for Benefits

     Section 4.1.   Amounts Provided by the Employer: Benefits payable under
this Plan shall constitute general obligations of the Employer in accordance
with the terms of this Plan. The employer may, but is not obligated to establish
a trust, the assets of which shall at all times before actual payment of
benefits to a Participant's Beneficiary remain subject to the claims of general
creditors of the Employer.  Nothing herein, however, shall be construed to
create or require the creation of a trust for the purpose of paying benefits
owing under this Plan. The Employer also may, but is not obligated to purchase
one or more life insurance policies or contracts to provide for its obligations
hereunder. Any such policies or contracts may, but shall not be required to name
the Employer or any trust as beneficiary and sole owner, with all incidents of
ownership therein, including (but not limited to) the right to cash and loan
values, dividends (if any), death benefits, and the right of termination. Any
such policies or contracts purchased hereunder shall remain a general
unrestricted asset of the Employer (or of any trust). Neither the Participant
nor any Beneficiary shall have any right, title or interest in or to, or any
claim, preferred or otherwise, in or to any particular assets of the Employer or
any trust that the Employer may establish hereunder, as a result of
participation in this Plan.

                                   ARTICLE V

                                 Death Benefits
                                        
     Section 5.1.   Eligibility For Death Benefits: A Participant shall be
entitled to a Death Benefit if he dies prior to attaining age 70.

                                       4
<PAGE>
 
     Section 5.2.   Amount of Death Benefit: The Death Benefit shall be
determined as follows:

(a)       If, at the time of the Participant's death, he is at least age 55 but
          less than age 65, the Death Benefit shall equal fifty percent (50%) of
          the Participant's Basic Life Insurance Amount in effect under the Life
          Plan immediately prior to his retirement from the employ of the
          Employer.

(b)       If, at the time of the Participant's death, he is at least age 65 but
          less than age 70, the Death Benefit shall equal twenty-five percent
          (25%) of the Participant's Basic Life Insurance Amount in effect under
          the Life Plan immediately prior to his retirement from the employ of
          the Employer.

     Section 5.3.   Form of Payment and Beneficiary of Death Benefit: The Death
Benefit shall be paid in a lump sum to the person or persons designated by the
Participant for this purpose, and, if applicable, shall be divided in such
manner, as specified by the Participant, on the appropriate form supplied by the
Employer.

     Section 5.4.   Payment of Death Benefits: The Death Benefits payable to a
deceased Participant's Beneficiary or Beneficiaries shall be paid as soon as
administratively possible following the Participant's death.

                                   ARTICLE VI

                                 Administration
                                        
     Section 6.1.   Plan Administrator: The Plan shall be administered by the
Plan Administrator.

     Section 6.2.   Powers of Plan Administrator: The Plan Administrator shall
have the discretionary power and authority to interpret and administer the Plan
according to its terms, including the power to construe and interpret the Plan,
to supply any omissions therein, to reconcile and correct any errors or
inconsistencies, to decide any questions in the administration and application
of the Plan, and to make equitable adjustments for any mistakes or errors in the
administration and application of the Plan. Any decision of the Plan
Administrator relating to any question concerning or involving the
interpretation of the Plan, however, shall be subject to the approval of the
President or Chief Executive Officer of the Company, whose decision in such
regard shall be final and conclusive.

                                  ARTICLE VII

                            Miscellaneous Provisions
                                        
     Section 7.1.   Amendment or Termination of the Plan:

                                       5
<PAGE>
 
(a)       In General. Subject to the remaining provisions of this Section 7.1,
          the Employer, by appropriate resolution of its Board of Directors,
          may, in its absolute discretion, from time to time, amend, suspend, or
          terminate any or all of the provisions of the Plan. Any amendment to
          the Plan shall be effectuated by a written instrument signed by the
          President, Chief Executive Officer or any Vice President of the
          Company.

(b)       Amendment That Decreases Death Benefits. If the Employer amends the
          Plan and the amendment decreases the Death Benefit otherwise payable
          to a Participant at the time of the amendment, that Participant shall
          receive the Death Benefit, determined without regard to the amendment,
          if he thereafter dies while still entitled to a Death Benefit.

     If the Employer terminates the Plan and the termination adversely affects
the Death Benefits payable at the time of such termination, a Participant shall
receive the Death Benefit determined without regard to the termination, if he
thereafter dies while still entitled to a Death Benefit.

     Section 7.2.   Nonguarantee of Employment: Nothing contained in this Plan
shall be construed as a contract of employment between the Employer and any
employee, as a right of any employee to be continued in the employment of the
Employer or to be continued as an officer of the Employer, or as a limitation of
the right of the Employer to discharge any of its employees, with or without
cause.

     Section 7.3.   Nonalienation of Benefits: To the extent permitted by law,
benefits payable under this Plan shall not, without the Plan Administrator's
consent, be subject in any manner to anticipation, alienation, sale, transfer,
assignment, pledge, encumbrance, charge, garnishment, execution, or levy of any
kind, either voluntary or involuntary. Any unauthorized attempt to anticipate,
alienate, sell, transfer, assign, pledge, encumber, charge, or otherwise dispose
of any right to benefits payable hereunder shall be void. No part of the assets
of the Employer shall be subject to seizure by legal process resulting from any
attempt by creditors of or claimants against any Participant or Beneficiary or
any person claiming under or through the foregoing to attach his interest under
the Plan.

     Section 7.4.   Liability: No director, officer, or employee of the Employer
shall be liable for any act or action, whether of commission or omission, taken
by any other director, officer, employee, or agent of the Employer under the
terms of the Plan or, except in circumstances involving his bad faith, for
anything done or omitted to be done by him under the terms of the Plan.

     Section 7.5.   Successors to the Employer: Any successor to the Employer
hereunder, which successor continues or acquires any of the business of the
Employer, shall be bound by the terms of 

                                       6
<PAGE>
 
this Plan in the same manner and to the same extent as the Employer.

     IN WITNESS WHEREOF, and as conclusive evidence of its adoption of this
Retired Officer Life Plan, the Employer has caused this Plan to be duly executed
on this    day of     , 1995, to be effective as of the date set forth in 
Section 1.2 above.


                              ATMOS ENERGY CORPORATION
 

                              By:  /s/ Robert F. Stephens
                                  ------------------------
                                        Robert F. Stephens
                                        President and Chief
                                        Operating Officer

                                       7

<PAGE>
 
                                                                Exhibit 10.31(a)

                               AMENDMENT NO. 1 TO
                          THE ATMOS ENERGY CORPORATION
                          EXECUTIVE RETIREE LIFE PLAN

     THIS AMENDMENT NO. 1 TO THE ATMOS ENERGY CORPORATION EXECUTIVE RETIREE LIFE
PLAN (the "Amendment") is executed and effective this 13th day of August, 1997.

     WHEREAS, ATMOS ENERGY CORPORATION (the "Company") heretofore adopted The
Atmos Energy Corporation Executive Retiree Life Plan (the "Plan") which became
effective on November 9, 1994; and

     WHEREAS, pursuant to Section 7.1 of the Plan which permits the Company to
amend the Plan from time to time, the Company desires to amend the Plan to
include operating company presidents of the Company in the Plan, as hereinafter
provided.
 
     NOW, THEREFORE, the Company does hereby amend the Plan in the following
respects:
 
     1.  Definitions.  All capitalized terms used and not otherwise defined
herein shall have the meanings given such terms in the Plan.

     2.  Amendment of Section 1.1.  Section 1.1 of the Plan describing the
purpose of the Plan is hereby amended to read in its entirety as follows:

          "Section 1.1.  Purpose:  The purpose of this Plan is to provide death
          benefits for retired corporate officers and operating company
          presidents of Atmos Energy Corporation."


     3.  Amendment of Section 2.1(e).  Subsection (e) of Section 2.1,
"Definitions", in which a  "Participant" of the Plan is defined, is hereby
amended to read in its entirety as follows:

          "(e) Participant:  An eligible corporate officer or operating company
          president of the Employer who retires and meets the requirements to
          participate in the Plan in accordance with the provisions of Article
          III hereof."

     4.  Amendment of Section 3.1.  Section 3.1, describing employees eligible
to participate in the Plan, is hereby amended to read in its entirety as
follows:
 
          "Section 3.1.  Employees Eligible to Participate: Any employee who
          retires from the employ of  the Employer on or after September 30,
          1994 and on or 
<PAGE>
 
          after attaining age 55 and who, immediately prior to his retirement,
          is a corporate officer or operating company president of the Employer,
          shall be eligible to participate in this Plan and shall become a
          Participant upon his retirement."
 
      5.  Amendment of Section 7.2.  Section 7.2, concerning nonguarantee of
employment, is hereby amended to read in its entirety as follows:
 
     "Section 7.2.  Nonguarantee of Employment:  Nothing contained in this Plan
          shall be construed as a contract of employment between the Employer
          and any employee, as a right of any employee to be continued in the
          employment of the Employer or to be continued as a corporate officer
          or operating company president of the Employer, or as a limitation of
          the right of the Employer to discharge any of its employee, with or
          without cause."

     IN WITNESS WHEREOF, the Company has caused this AMENDMENT NO. 1 TO THE
ATMOS ENERGY CORPORATION EXECUTIVE RETIREE LIFE PLAN to be executed in its name
and on its behalf this 13/th/ day of August, 1997.


                                    ATMOS ENERGY CORPORATION


                                    By: /s/ Robert W. Best
                                      ---------------------
                                      Robert W. Best
                                      Chairman, President and CEO

                                       2

<PAGE>
 
                                                                      Exhibit 21

                    SUBSIDIARIES OF ATMOS ENERGY CORPORATION

                                            State of         Percent of    
                  Name                    Incorporation         Stock    
                                                            

Atmos Energy Services, Inc.                 Delaware            100%

EGASCO, Inc.                                  Texas             100%

ENERMART, INC                               Delaware            100%

ENERMART TRUST (a Pennsylvania            Pennsylvania          100% 
Business Trust and a wholly-owned                              
subsidiary of Enermart, Inc.)
 
Trans Louisiana Industrial Gas              Louisiana           100%
 Company, Inc
 
UCG Energy Corporation                      Delaware            100%

UCG Leasing, Inc. (wholly-owned              Georgia            100%         
subsidiary of UCG Energy Corporation)                           
 
United Cities Gas Storage Company           Delaware            100%

United Cities Propane Gas of                Tennessee           100%         
Tennessee, Inc. (wholly-owned                                   
subsidiary of UCG Energy Corporation)
 
Western Kentucky Gas Resources              Delaware            100%
 Company d/b/a NRG, Inc.

<PAGE>
 
                                                                    Exhibit 23.1



                         CONSENT OF INDEPENDENT AUDITOR


We consent to the incorporation by reference in the Registration Statements
(Form S-3 No. 33-37869, Form S-3 No. 33-70212, Form S-3 No. 33-58220, Form S-3
No. 33-56915, Form S-3 No. 333-03339, Form S-3 No. 333-32475, Form S-4 No. 333-
13429, Form S-8 No. 33-57687, Form S-8 No. 33-68852, Form S-8 No. 33-57695, and
Form S-8 No. 333-32343) of Atmos Energy Corporation and in the related
Prospectuses of our report dated November 11, 1997, with respect to the
consolidated financial statements of Atmos Energy Corporation included in this
Annual Report (Form 10-K) for the year ended September 30, 1997.



                                                               ERNST & YOUNG LLP

Dallas, Texas
December 19, 1997

<PAGE>
 
                                                                    Exhibit 23.2



                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent public accountants, we hereby consent to the use of our report
dated February 14, 1997 on the consolidated financial statements of United
Cities Gas Company, Inc. and subsidiaries included in Atmos Energy Corporation's
Form 10-K for the fiscal year ended September 30, 1997.



                                                             ARTHUR ANDERSEN LLP

Nashville, Tennessee
December 19, 1997

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> UT
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED FINANCIAL STATEMENTS OF ATMOS ENERGY CORPORATION FOR THE YEAR ENDED
SEPTEMBER 30, 1997, AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-END>                               SEP-30-1997
<BOOK-VALUE>                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                      849,127
<OTHER-PROPERTY-AND-INVEST>                          0
<TOTAL-CURRENT-ASSETS>                         143,705
<TOTAL-DEFERRED-CHARGES>                        95,479
<OTHER-ASSETS>                                       0
<TOTAL-ASSETS>                               1,088,311
<COMMON>                                           148
<CAPITAL-SURPLUS-PAID-IN>                      251,174
<RETAINED-EARNINGS>                             75,938
<TOTAL-COMMON-STOCKHOLDERS-EQ>                 327,260
                                0
                                          0
<LONG-TERM-DEBT-NET>                           302,981
<SHORT-TERM-NOTES>                             167,300
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                       0
<LONG-TERM-DEBT-CURRENT-PORT>                   15,201
                            0
<CAPITAL-LEASE-OBLIGATIONS>                      2,665
<LEASES-CURRENT>                                   382
<OTHER-ITEMS-CAPITAL-AND-LIAB>                 272,522
<TOT-CAPITALIZATION-AND-LIAB>                1,088,311
<GROSS-OPERATING-REVENUE>                      906,835
<INCOME-TAX-EXPENSE>                            14,298
<OTHER-OPERATING-EXPENSES>                     840,226
<TOTAL-OPERATING-EXPENSES>                     854,524
<OPERATING-INCOME-LOSS>                         52,311
<OTHER-INCOME-NET>                               5,122
<INCOME-BEFORE-INTEREST-EXPEN>                  57,433
<TOTAL-INTEREST-EXPENSE>                        33,595
<NET-INCOME>                                    23,838
                          0
<EARNINGS-AVAILABLE-FOR-COMM>                   23,838
<COMMON-STOCK-DIVIDENDS>                        26,415
<TOTAL-INTEREST-ON-BONDS>                       12,569
<CASH-FLOW-OPERATIONS>                          68,749
<EPS-PRIMARY>                                     1.01
<EPS-DILUTED>                                     1.01
        

</TABLE>


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