ATMOS ENERGY CORP
S-8, 1997-07-29
NATURAL GAS DISTRIBUTION
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<PAGE>
 
     As filed with the Securities and Exchange Commission on July 29, 1997
                                                Registration No. 333- __________
================================================================================
           
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D. C. 20549

                                   FORM S-8
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933

                           ATMOS ENERGY CORPORATION
            (Exact name of Registrant as specified in its charter)
     
               TEXAS                                 75-1743247
     (State or other jurisdiction of              (I.R.S. Employer
     incorporation or organization)            Identification Number)
       1800 Three Lincoln Centre
          5430 LBJ Freeway
           Dallas, Texas
(Address of principal executive offices)                 75240
                                                      (Zip Code)

                           ATMOS ENERGY CORPORATION
                         LONG-TERM STOCK PLAN FOR THE
                      UNITED CITIES GAS COMPANY DIVISION
                             (Full Title of Plan)


                                                 Copies to:
           GLEN A. BLANSCET                   BRYAN E. BISHOP
    Vice President, General Counsel      Locke Purnell Rain Harrell
        and Corporate Secretary          (A Professional Corporation)
       Atmos Energy Corporation          2200 Ross Avenue, Suite 2200
       1800 Three Lincoln Centre            Dallas, Texas  75201
           5430 LBJ Freeway
         Dallas, Texas  75240
(Name and address of agent for service)
 
           (972) 934-9227
(Telephone number, including area code,
         of agent for service)
                        CALCULATION OF REGISTRATION FEE
<TABLE> 
<CAPTION> 
================================================================================================================
                                                Proposed maximum      Proposed maximum                                          
  Title of securities         Amount to be       offering price          aggregate               Amount of                        
  to be registered            registered (a)     per share (b)        offering price (b)      registration fee                  
- ----------------------------------------------------------------------------------------------------------------                
<S>                           <C>               <C>                   <C>                     <C> 
Common Stock, no par value...     250,000          $24.34375              $6,085,938               $1,845 
================================================================================================================
</TABLE> 

(a) Includes such additional shares as may be issued as a result of the
    antidilution provisions of the Plan, pursuant to Rule 416 promulgated under
    the Securities Act of 1933.

(b) Estimated solely for the purpose of calculating the registration fee in
    accordance with Rule 457 (h) on the basis of the average of the high and low
    prices of the Registrant's Common Stock as reported on the New York Stock
    Exchange on July 25, 1997.
<PAGE>
 
                                    PART I

               INFORMATION REQUIRED IN SECTION 10(A) PROSPECTUS

     The information specified by Item 1 and Item 2 of Part I of Form S-8 is
omitted from this filing in accordance with the provisions of Rule 428 under the
Securities Act of 1933 (the "Securities Act"), and the introductory note of Part
I of Form S-8.
 
                                    PART II

              INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.   Incorporation of Documents by Reference.
          --------------------------------------- 

     The following documents filed by the Registrant with the Securities and
Exchange Commission (the "Commission") are incorporated by reference in this
Registration Statement:

     (a)  Registrant's Annual Report on Form 10-K for the fiscal year ended
          September 30, 1996;

     (b)  Registrant's Quarterly Reports on Form 10-Q for the quarters ended
          December 31, 1996 and March 31, 1997;
 
     (c)  Registrant's Current Reports on Form 8-K dated November 2, 1996,
          November 16, 1996, February 17, 1997, March 17, 1997, April 4, 1997
          and July 17, 1997; and

     (d)  The description of Registrant's Common Stock contained in the
          Registrant's Registration Statement on Form 8-A dated September 7,
          1988 (Commission File No.1-10042) filed pursuant to Section 12 of the
          Securities Exchange Act of 1934 (the "Exchange Act"), and all
          amendments thereto and reports which have been filed for the purpose
          of updating such description, including, without limitation, the
          Registrant's Current Report on Form 8-K dated November 16, 1996.

     All documents filed by Registrant pursuant to Sections 13(a), 13(c), 14, or
15(d) of the Exchange Act subsequent to the date of this Registration Statement
and prior to the filing of a post-effective amendment which indicates that all
securities offered have been sold or which deregisters all securities then
remaining unsold shall be deemed to be incorporated by reference in this
Registration Statement and to be a part hereof from the date of filing of such
documents.

Item 4.   Description of Securities.
          ------------------------- 

     Not applicable.

                                       2
<PAGE>
 
Item 5.   Interests of Named Experts and Counsel.
          -------------------------------------- 

     The validity of the shares of Registrant's Common Stock offered hereby has
been passed upon for Registrant by the law firm of Locke Purnell Rain Harrell (A
Professional Corporation), Dallas, Texas.  Dan Busbee, a director of Registrant,
is a shareholder of Locke Purnell Rain Harrell (A Professional Corporation).

Item 6.   Indemnification of Directors and Officers.
          ----------------------------------------- 

     Both the Texas Business Corporation Act and the Virginia Stock Corporation
Act permit, and in some cases, require corporations to indemnify directors and
officers who are or have been a party or are threatened to be made a party to
litigation against judgments, penalties (including excise and similar taxes),
fines, settlements, and reasonable expenses under certain circumstances. Article
IX of Registrant's Restated Articles of Incorporation and Article IX of
Registrant's Bylaws provide for indemnification of judgments, penalties
(including excise and similar taxes), fines, settlements, and reasonable
expenses and the advance payment or reimbursement of such reasonable expenses to
directors and officers to the fullest extent permitted by law.

     The Texas Business Corporation Act also allows corporations, with the
approval of its shareholders, to limit the liability of directors for monetary
damages under certain circumstances.  Article X of Registrant's Restated
Articles of Incorporation provides for such limitation of liability to the
fullest extent permitted by law.

     Registrant maintains an officers' and directors' liability insurance policy
insuring officers and directors against certain liabilities, including
liabilities under the Securities Act.  The effect of such policy is to indemnify
the officers and directors of Registrant against losses incurred by them while
acting in such capacities.
 
Item 7.   Exemption From Registration Claimed.
          ----------------------------------- 

     Not applicable.
 
Item 8.   Exhibits.
          ---------

     The exhibits listed in the accompanying Index to Exhibits are furnished as
a part of this Registration Statement.

Item 9.   Undertakings.
          ------------ 

     (a)  The undersigned Registrant hereby undertakes:

          (1)  To file, during any period in which offers or sales are being
               made, a post-effective amendment to this Registration Statement:

                                       3
<PAGE>
 
               (i)    To include any prospectus required by Section 10(a)(3) of
               the Securities Act;

               (ii)   To reflect in the prospectus any facts or events arising
               after the effective date of this Registration Statement (or the
               most recent post-effective amendment hereof) which, individually
               or in the aggregate, represent a fundamental change in the
               information set forth in this Registration Statement;

               (iii)  To include any material information with respect to the
               plan of distribution not previously disclosed in this
               Registration Statement or any material change to such information
               in this Registration Statement;

          provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not
          apply if the information required to be included in a post-effective
          amendment by those paragraphs is contained in periodic reports filed
          with or furnished to the Commission by Registrant pursuant to Section
          13 or Section 15(d) of the Exchange Act that are incorporated by
          reference in this Registration Statement;

          (2)  That, for the purpose of determining any liability under the
               Securities Act, each such post-effective amendment shall be
               deemed to be a new registration statement relating to the
               securities offered therein, and the offering of such securities
               at that time shall be deemed to be the initial bona fide offering
               thereof; and

          (3)  To remove from registration by means of a post-effective
               amendment any of the securities being registered which remain
               unsold at the termination of the offering.

     (b)  That, for purposes of determining any liability under the Securities
Act, each filing of the Registrant's annual report pursuant to Section 13(a) or
Section 15(d) of the Exchange Act (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to Section 15(d) of the Exchange
Act) that is incorporated by reference in this Registration Statement shall be
deemed to be a new registration statement relating to the securities offered
therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.
 
     (c)  Insofar as indemnification for liabilities arising under the
Securities Act may be permitted to directors, officers, and controlling persons
of Registrant pursuant to the foregoing provisions, or otherwise, Registrant has
been advised that in the opinion of the Commission such indemnification is
against public policy as expressed in the Securities Act and is, therefore,
unenforceable. In the event that a claim for indemnification against such
liabilities (other than the payment by Registrant of expenses incurred or paid
by a director, officer, or controlling 

                                       4
<PAGE>
 
person of Registrant in the successful defense of any action, suit, or
proceeding) is asserted by such director, officer, or controlling person in
connection with the securities being registered, Registrant will, unless in the
opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities
Act and will be governed by the final adjudication of such issue.

                                       5
<PAGE>
 
                                   SIGNATURE

     Pursuant to the requirements of the Securities Act of 1933, Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-8 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Dallas, State of Texas, on July 29, 1997.


                                    ATMOS ENERGY CORPORATION


                                    By: /s/ ROBERT W. BEST
                                       -----------------------------------------
                                        Robert W. Best
                                        Chairman, President and CEO


                               POWER OF ATTORNEY

     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the dates indicated.  Each person whose signature appears
below hereby constitutes and appoints Robert W. Best his true and lawful
attorney-in-fact and agent, 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 (including post-effective amendments) to this
Registration Statement, 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.

<TABLE>
<CAPTION>
         Signature                     Title                         Date
         ---------                     -----                         ---- 
<S>                          <C>                                  <C>

/s/   ROBERT W. BEST         Chairman, President and CEO   
- --------------------------   (Principal Executive Officer)        July 29, 1997
      Robert W. Best           
</TABLE>

                                       6
<PAGE>
 
<TABLE>
<S>                          <C>                                 <C>  
/s/ LARRY J. DAGLEY          Executive Vice President            July 29, 1997
- --------------------------   (Principal Financial Officer)   
Larry J. Dagley


/s/ DAVID L. BICKERSTAFF     Vice President and Corporate        July 29, 1997
- --------------------------   Controller
David L. Bickerstaff         (Principal Accounting Officer)


/s/ TRAVIS W. BAIN II        Director                            July 29, 1997 
- --------------------------                                                      
Travis W. Bain II


/s/ DAN BUSBEE               Director                            July 29, 1997 
- --------------------------
Dan Busbee


/s/ THOMAS C. MEREDITH       Director                            July 29, 1997 
- --------------------------
Thomas C. Meredith


/s/ PHILLIP E. NICHOL        Director                            July 29, 1997 
- --------------------------                                                      
Phillip E. Nichol


/s/ CARL S. QUINN            Director                            July 29, 1997
- --------------------------
Carl S. Quinn


/s/ LEE E. SCHLESSMAN        Director                            July 25, 1997
- --------------------------
Lee E. Schlessman


/s/ CHARLES K. VAUGHAN       Director                            July 29, 1997
- --------------------------
Charles K. Vaughan


/s/ RICHARD WARE II          Director                            July 23, 1997
- --------------------------
Richard Ware II
</TABLE>

                                       7
<PAGE>
 
                                 EXHIBIT INDEX

<TABLE>
<CAPTION>

      EXHIBIT                         DESCRIPTION                          PAGE
      -------                         -----------                          ----
      NUMBER                                                              NUMBER
      ------                                                              ------
<S>                     <C>                                               <C> 
4.1                     Specimen Common Stock Certificate (Atmos           
                        Energy Corporation) (incorporated by               
                        reference from Exhibit 4(b) of                     
                        Registrant's Annual Report on Form 10-K            
                        (File No. 1-10042) for the fiscal year             
                        ended September 30, 1988).                         

4.2(a)                  Rights Agreement, dated as of April 27,            
                        1988, between Registrant and The First             
                        National Bank of Boston (successor trustee         
                        to Morgan Shareholder Services Trust               
                        Company) (incorporated by reference from           
                        Exhibit 1 of Registrant's Form 8-K (File           
                        No. 0-11249) filed May 10, 1988).                  

4.2.(b)                 Amendment No. 1 to Rights Agreement, dated         
                        August 10, 1994 (incorporated by reference         
                        from Exhibit 4.3(b) of Registrant's Annual         
                        Report on Form 10-K for the fiscal year            
                        ended September 30, 1994 (File No.                 
                        1-10042)).                                         

4.2(c)                  Certificate of Adjusted Price, dated               
                        August 15, 1994 (incorporated by reference         
                        from Exhibit 4.3(c) of Registrant's Annual         
                        Report on Form 10-K (File No. 10042) for           
                        the fiscal year ended September 30, 1994).         

 5.1                    Opinion of Locke Purnell Rain Harrell.             

23.1                    Consent of Locke Purnell Rain Harrell              
                        (included in Exhibit 5.1).                         

23.2                    Consent of Ernst & Young LLP.                      

24.1                    Power of Attorney (included on the                 
                        signature page of this Registration                
                        Statement).                                        

99.1                    Atmos Energy Corporation Long-Term Stock           
                        Plan for the United Cities Gas Company             
                        Division.                                          

99.2                    Form of Cumulative Award Agreement.                
</TABLE>

                                       8

<PAGE>
 
                                                                     EXHIBIT 5.1

                  [LETTERHEAD OF LOCKE PURNELL RAIN HARRELL]



July 29, 1997
 

Atmos Energy Corporation
1800 Three Lincoln Centre
5430 LBJ Freeway
Dallas, TX  75240

Re:  Registration Statement on Form S-8,
     Atmos Energy Corporation Long-Term Stock Plan
     for the United Cities Gas Company Division

Gentlemen:

     We have acted as special counsel for Atmos Energy Corporation, a Texas
Corporation (the "Company"), in connection with the registration under the
Securities Act of 1933, as amended (the "Securities Act"), pursuant to a
Registration Statement on Form S-8 (the "Registration Statement"), of 250,000
shares of common stock, no par value, of the Company (the "Common Stock") to be
offered pursuant to the Atmos Energy Corporation Long-Term Stock Plan for the
United Cities Gas Company Division (the "Plan").

     Based upon our examination of such papers and documents and the
investigation of such matters of law as we have deemed relevant or necessary in
rendering this opinion, we hereby advise you that we are of the opinion that:

     1.  The Company is duly incorporated, validly existing and in good standing
under the laws of the State of Texas.

     2.  Assuming, with respect to shares of Common Stock issued after the date
hereof, (i) the receipt of proper consideration for the issuance thereof, (ii)
the availability of a sufficient number of shares of Common Stock authorized by
the Company's Restated Articles of Incorporation then in effect, (iii)
compliance with the terms of any agreement entered into in connection with
awards under the Plan and (iv) no change occurs in the applicable law or the
pertinent facts, the shares of Common Stock issuable under any award under the
Plan will be duly authorized and validly issued, fully paid and non-assessable
shares of Common Stock.
<PAGE>
 
     We consent to the use of our name in the Registration Statement filed by
the Company with the Securities and Exchange Commission for the registration
under the Securities Act of 250,000 shares of Common Stock of the Company in
connection with the Plan and to the filing of a copy of this opinion as Exhibit
5.1 to the Registration Statement. In giving such consent, we do not hereby 
admit that we are within the category of persons whose consent is required by 
Section 7 of the Securities Act or the related rules promulgated by the 
Securities and Exchange Commission.


                                    Very truly yours,
 
                                    LOCKE PURNELL RAIN HARRELL
                                    (A Professional Corporation)



                                    By: /s/ BRYAN E. BISHOP
                                    ------------------------------------------ 
                                            Bryan E. Bishop

<PAGE>
 
                                                                    Exhibit 23.2

                        CONSENT OF INDEPENDENT AUDITOR

We consent to the incorporation by reference in the Registration Statement (Form
S-8) of Atmos Energy Corporation for the registration of 250,000 shares of its
common stock of our report dated November 4, 1996 with respect to the
consolidated financial statements of Atmos Energy Corporation included in its
Annual Report on Form 10-K for the year ended September 30, 1996, filed with the
Securities and Exchange Commission.

                                                               ERNST & YOUNG LLP


Dallas, Texas
July 29, 1997

<PAGE>
 
                                                                    EXHIBIT 99.1


                           ATMOS ENERGY CORPORATION
                         LONG-TERM STOCK PLAN FOR THE
                      UNITED CITIES GAS COMPANY DIVISION

     WHEREAS, the Board of Directors of United Cities Gas Company, an Illinois
and Virginia corporation ("United Cities"), duly established the United Cities
Long-Term Stock Plan of 1989 (the "United Cities Plan"); and
 
     WHEREAS, on April 28, 1989, a majority of the shareholders of United Cities
approved the establishment of the United Cities Plan; and
 
     WHEREAS, on July 19, 1996, Atmos Energy Corporation (the "Company") and
United Cities entered into that certain Agreement and Plan of Reorganization,
which was amended on October 3, 1996 by Amendment No. 1 to the Agreement and
Plan of Reorganization (collectively, the "Agreement") , pursuant to which
United Cities was merged with and into the Company on July 31, 1997 (the
"Merger"); and
 
     WHEREAS, pursuant to Section 4.9 of the Agreement, the Company agreed to
continue in effect the United Cities Plan, following the consummation of the
Merger; and
 
     WHEREAS, the Board of Directors of the Company approved the adoption of the
United Cities Plan and the assumption of all outstanding rights previously
granted to each participant thereunder through its approval of the Agreement;
and
 
     WHEREAS, a majority of the shareholders of the Company approved the
adoption of the United Cities Plan through their approval of the Merger, the
Agreement and the related Plan of Merger on November 12, 1996; and
 
     WHEREAS, in compliance with Section 4.9 of the Agreement, the United Cities
Plan has been amended and restated as the Atmos Energy Corporation Long-Term
Stock Plan for the United Cities Gas Company Division (the "Plan"); and
 
     WHEREAS, although it may do so, the Company does not contemplate granting
or awarding any further Incentive Stock Options, Nonqualified Stock Options,
Restricted Stock or Stock Appreciation Rights or any combination thereof under
the Plan, but only to allow all outstanding grants originally awarded under the
United Cities Plan to be exercised, pursuant to which the holders will receive
shares of Stock (as defined below) in lieu of shares of United Cities common
stock.
 
1.   Purpose
     -------

     The purposes of the Plan are to:

     a.   Provide incentives to Key Employees (as defined below) to perform in
          the best interests of the shareholders of the Company and its
          customers.
<PAGE>
 
     b.   Encourage Key Employees to increase their proprietary interest in the
          Company and thereby increase their interest in the success of the
          Company and its shareholders.

     c.   Provide a means of retaining a high quality of employees and
          strengthen their desire to remain in the employ of the Company.

     To meet these purposes, the Plan provides for the granting of Incentive
     Stock Options, Nonqualified Stock Options, Restricted Stock and Stock
     Appreciation Rights or any combination thereof.

2.   Definitions
     -----------

     The following definitions shall be applicable throughout the Plan:

     a.   Award" means a grant provided to any Key Employee in accordance with
          the provisions of the Plan in the form of Incentive Stock Options,
          Nonqualified Stock Options, Restricted Stock or Stock Appreciation
          Rights (as such terms are defined below) or any combination thereof.

     b.   "Award Agreement" means the written agreement evidencing each Award
          granted by the Company to a Key Employee under the Plan.

     c.   "Board" means the Board of Directors of the Company.

     d.   "Change of Control" means the occurrence of an event defined in
          Section 10 hereof.

     e.   "Code" means the Internal Revenue Code of 1986, as amended.

     f.   "Committee" means the Human Resources Committee of the Board or any
          such other committee as may be designated by the Board to administer
          the Plan, the membership of such committee not being less than three
          members of the Board, all of whom are "non-employee directors" as
          defined under Rule 16b-3 of the Exchange Act.

     g.   "Date of Grant" with respect to any Award means the actual date that
          the grant of such Award under the Plan is approved by the Committee.

     h.   "Disability" means total disability as defined in Section 422 of the
          Code and the rules and regulations promulgated thereunder.

     i.   "Exchange Act" means the Securities Exchange Act of 1934.

                                       2
<PAGE>
 
     j.   "Fair Market Value" means, as of any date, the closing price for one
          share of Stock (as defined below) on such date, or if such date is
          not a trading day, for the trading day immediately prior to such date,
          in either case where the closing price shall be the last quoted price,
          or, if not so quoted, the closing price as reported on the New York
          Stock Exchange Composite Tape.

     k.   "Incentive Stock Option" means an incentive stock option within the
          meaning of Section 422 of the Code.

     l.   "Key Employee" means an employee of the Company who is a former United
          Cities employee, including any former United Cities director who was
          also an employee of United Cities, who was deemed, in the judgment of
          the Board of Directors of United Cities, or a committee appointed by
          it, to be a "key employee".

     m.   "Nonqualified Stock Option" means any stock option other than an
          Incentive Stock Option.

     n.   "Options" means collectively each Incentive Stock Option and
          Nonqualified Stock Option awarded under the Plan.

     o.   "Restricted Stock" means Stock (as defined below) awarded under
          Section 8 hereof.

     p.   "Retirement" means normal or early retirement from the Company as
          defined in United Cities' principal retirement plan in effect at July
          31, 1997.

     q.   "Securities Act" means the Securities Act of 1933.

     r.   "Stock" means the common stock, no par value, of the Company.

     s.   "Stock Appreciation Right" or "SAR" means a stock appreciation right
          awarded under Section 9 hereof.

     t.   "Subsidiary" means any corporation in which the Company, or any
          Subsidiary thereof, owns, directly or indirectly, capital stock having
          a voting power equal to 50% or more of the total combined voting power
          of all capital stock of such corporation and which is designated by
          the Board to participate in the Plan.

                                       3
<PAGE>
 
3.   Administration
     --------------

          The Plan shall be administered by the Committee.  No member of the
     Committee shall be eligible to receive an Award under the Plan.  Subject to
     the provisions of the Plan, the Committee shall have exclusive power to:
 
     a.   Select employees to participate in the Plan.
 
     b.   Determine the amount, duration and type of Awards to be made.
 
     c.   Determine the times(s) when Awards will be made and the terms and
          conditions to which Awards may be subject.

          The Committee shall have full power, discretion and authority to
     interpret, construe and administer the Plan.  The Committee's decisions
     regarding Awards need not be uniform and may be made selectively among Key
     Employees.  The Committee's interpretation of the Plan and any Awards
     granted under the Plan and all decisions and determinations by the
     Committee with respect to the Plan shall be final, binding and conclusive
     on all parties.  The Committee may, subject to the provisions of the Plan,
     establish, alter or repeal such rules and regulations as it deems necessary
     or advisable for the proper administration of the Plan.

4.   Shares Subject to the Plan
     --------------------------

          The aggregate number of shares of Stock which may be awarded under the
     Plan, subject to purchase by exercising Options and subject to Stock
     Appreciation Rights granted under the Plan shall not exceed 250,000 shares.
     Such number of shares shall be subject to adjustment in accordance with
     Section 12 hereof.  Such shares of Stock may be authorized and unissued
     shares, treasury shares or shares purchased on the open market or by
     private purchase at prices no higher than the Fair Market Value of Stock at
     the time of purchase.  If, for any reason, any shares of Stock (including
     Restricted Stock) awarded, or subject to an unexercised portion of an
     Option or a Stock Appreciation Right granted under the Plan which has
     expired, are forfeited, surrendered, canceled or terminated, such shares of
     Stock shall again become available for Award under the Plan.

5.   Effective Date and Term of the Plan
     -----------------------------------

          The Plan shall be in effect as of July 31, 1997, and, subject to the
     provisions of Section 13 hereof, the Plan shall remain in effect and Awards
     may be made as provided herein for a period of ten years, ending December
     31, 1998.  Notwithstanding the expiration or termination of the Plan as
     herein provided, the Plan shall continue in effect until all matters
     relating to the payment of Awards and administration of the Plan have been
     settled; provided, however, that upon such expiration or termination no
     further Awards may be granted under the Plan.

                                       4
<PAGE>
 
6.   Grant of Awards
     ---------------

          Each Award granted under the Plan shall be evidenced by a written
     Award Agreement.  Such agreement shall be subject to and incorporate the
     express terms and conditions, if any, required under the Plan or required
     by the Committee.

7.   Stock Options
     -------------

          The Committee may, at any time and in its discretion, authorize the
     grant of one or more Options to any Key Employee.  Each Option so granted
     shall be subject to the following terms (in addition to any other terms
     contemplated hereunder):

     a.   OPTION TERM:  The Option awarded may be exercised at such times and
          subject to such conditions as determined by the Committee; provided,
          however, that no Option shall be exercisable after ten (10) years from
          the Date of Grant.

     b.   OPTION PRICE:  The Option price per share shall be determined by the
          Committee at the time such Option is awarded and shall not be less
          than the Fair Market Value of one share of Stock on the Date of Grant.

     c.   EXERCISE: An Option may be exercised by the Key Employee to whom it is
          granted in accordance with its terms as provided in the Award
          Agreement by delivering to the Company written notice to that effect.
          The purchase price of the shares of Stock as to which an Option is
          exercised shall be paid to the Company at the time of exercise either
          in cash or Stock (or a combination thereof) already owned by the
          person exercising such Option having a total Fair Market Value equal
          to the option price of the shares of Stock the subject of the exercise
          of the Option at the time it is exercised.  No shares of Stock shall
          be issued until full payment has been received therefor and the person
          exercising the Option shall have complied with the requirements set
          forth in the Plan and the Award Agreement.

     d.   TERMINATION OF EMPLOYMENT:  In the event that the employment of a Key
          Employee to whom an Option has been awarded has been terminated for
          any reason (including a termination by the Company whether or not for
          good cause and a termination by reason of the death, Disability or
          Retirement of the Key Employee), other than a termination associated
          with a Change of Control as described in Section 10, such Option shall
          be canceled coincident with the effective date of termination.  The
          Committee in its sole discretion may provide in the Award Agreement
          that in the event that the employment of the Key Employee to whom an
          Option the subject of such Award Agreement is being granted has been
          terminated (i) by reason of death or Disability, such Option may be
          exercised for a period of up to one (1) year after the date of such
          termination, or (ii) by reason of Retirement, such Option may be
          exercised for a period of up to three (3) months after the date of
          such termination; provided, however, that in no event 

                                       5
<PAGE>
 
          may such Option be exercised beyond the expiration date set forth in
          the Award Agreement, and provided, further, that such Option is or
          becomes otherwise exercisable by its terms prior to the expiration of
          the applicable period after such termination.

     e.   TRANSFER:  Options shall not be transferable except by will or the
          laws of descent and distribution and shall be exercisable during the
          lifetime of the Key Employee to whom such Options were granted only by
          such Key Employee.

     f.   CHANGE OF CONTROL:  Notwithstanding any other provisions contained in
          the Plan or the Award Agreement, any Option which has not expired
          under its term and is held by a Key Employee at the time of a Change
          of Control shall be exercisable as of the date of such Change of
          Control, unless the Committee in its sole discretion otherwise
          determines.

     g.   INCENTIVE STOCK OPTIONS:  The Committee, with respect to each Award of
          an Option to a Key Employee, shall determine whether such Option shall
          be an Incentive Stock Option or a Nonqualified Stock Option, and, upon
          making such determination, shall designate such Option as either an
          Incentive Stock Option or a Nonqualified Stock Option, as the case may
          be, in the Award Agreement.

     h.   AWARD AGREEMENT:  Each Option shall be evidenced by an Award Agreement
          which shall set forth the number of shares of Stock the subject of
          such Option, the time or period for its exercise, the exercise price
          per share and such other terms and conditions as the Committee shall
          require or otherwise deems desirable.

     i.   LIMITATION OF STOCK PURCHASES:  To the extent required by the Code,
          the aggregate Fair Market Value (as determined at the time of the Date
          of Grant of Incentive Stock Options) of the Stock with respect to
          which any Incentive Stock Options are exercisable by an Key Employee
          for the first time during any calendar year shall not exceed $100,000
          for such Key Employee, plus the amount of any unused limit carryover
          from any prior years.

     j.   LIMITATION OF AWARD OF INCENTIVE STOCK OPTIONS:  No Incentive Stock
          Option may be granted to any employee (whether or not then a Key
          Employee) who at the time such Incentive Stock Option would otherwise
          be granted (but for the provisions contained in this limitation) owns
          more than ten percent (10%) of the total combined voting power of all
          classes of capital stock of the Company unless (i) the Option price in
          respect of each share of Stock the subject of such Incentive Stock
          Option is not less than 110% of the Fair Market Value of each share of
          Stock on the Date of Grant, and (ii) such Incentive Stock Option is
          not exercisable after the end of the fifth year from the Date of
          Grant.

                                       6
<PAGE>
 
8.   Restricted Stock
     ----------------

          The Committee may, at any time and in its discretion, authorize the
     grant of Awards of Stock constituting Restricted Stock to any Key Employee.
     Each Award of Restricted Stock shall be subject to the following terms (in
     addition to any other terms contemplated hereunder):

     a.   RESTRICTIONS:  Any Award of Stock pursuant to this Section 8 shall be
          subject to such restrictions and terms, and all other conditions with
          respect to the grant thereof, including (without limitation) any
          required payments to be made by the Key Employee in respect thereof,
          as the Committee in its discretion may determine (such Stock being
          herein referred to as "Restricted Stock").  At the time a Restricted
          Stock Award is made, the Committee shall establish a period (after
          which restrictions will lapse) during which all restrictions in
          respect of the Stock constituting the Restricted Stock shall apply,
          which shall be a period commencing on the Award Date of Grant and
          ending on such date as the Committee shall determine (the "Restriction
          Period").  The Committee may provide for the lapse of restrictions in
          installments where it deems appropriate.  At the discretion of the
          Committee, each Restricted Stock Award may have a different
          Restriction Period.

     b.   TERMINATION OF EMPLOYMENT:  Except as may be otherwise determined by
          the Committee, in the event that the employment of a Key Employee to
          whom an Award of Restricted Stock has been granted has been terminated
          for any reason (including a termination by the Company whether or not
          for good cause and a termination by reason of the death, Disability or
          Retirement of the Key Employee), other than a termination associated
          with a Change of Control as described in Section 10 hereof, before the
          expiration of the Restriction Period, all shares of Restricted Stock
          still subject to restriction shall be forfeited and shall be
          reacquired by the Company.

     c.   TRANSFER:  No shares of Restricted Stock shall be sold, exchanged,
          transferred, pledged, hypothecated or otherwise disposed of during the
          Restriction Period except that such Restricted Stock may be bequeathed
          in a testamentary will during the Restriction Period.

     d.   WAIVER OF RESTRICTIONS:  In cases of death, Disability, Retirement,
          Change of Control as described in Section 10 hereof or special
          circumstances (as determined by the Committee), the Committee may, in
          its sole discretion, when it finds that a waiver would be in the best
          interests of the Company, elect to waive any or all remaining
          restrictions with respect to a Key Employee's Restricted Stock.

                                       7
<PAGE>
 
     e.   CHANGE OF CONTROL:  Notwithstanding any other provisions contained
          herein or in the Award Agreement, all restrictions on any Restricted
          Stock shall lapse immediately upon a Change of Control, unless the
          Committee in its sole discretion otherwise determines, except for
          restrictions, if any, on the transferability of such shares required
          to satisfy applicable federal and state securities laws.

     f.   AWARD AGREEMENT:  Each Restricted Stock Award shall be evidenced by an
          Award Agreement which shall define the Restriction Period and contain
          such other terms and conditions as the Committee shall require or
          otherwise deems desirable.

     g.   STOCK CERTIFICATES:  As soon as practicable after the Award of
          Restricted Stock, the Company shall cause to be issued a Stock
          certificate, registered in the name of the Key Employee to whom such
          Award has been granted, evidencing the number of shares of Stock the
          subject of the Restricted Stock Award.  Unless such certificate is
          deposited with a custodian pursuant to Paragraph (h) of this Section
          8, each such certificate shall bear the following legend (in addition
          to any other restrictive legends otherwise applicable in respect of
          the shares covered thereby):

               "The transferability of this certificate and the shares of stock
               represented hereby are subject to the restrictions, terms and
               conditions (including forfeiture and restrictions against
               transfer) contained in the Atmos Energy Corporation Long-Term
               Stock Plan for the United Cities Gas Company Division and an
               Award Agreement entered into between the registered owner of such
               shares and Atmos Energy Corporation. A copy of the Plan and Award
               Agreement is on file in the office of the Secretary of Atmos
               Energy Corporation, 5430 LBJ Freeway, Three Lincoln Centre, Suite
               1800, Dallas, Texas 75240."

          Such legend shall not be removed from any Stock certificate evidencing
          such Restricted Stock until the lapse of restrictions applicable
          thereto.

     h.   CUSTODIAN:  As an alternative to delivery of a Stock certificate to
          the Key Employee pursuant to Paragraph (g) of this Section 8
          containing the legend set forth therein, any Stock certificate
          evidencing an Award of Restricted Stock may be deposited by the
          Company with a custodian to be designated by the Committee. The
          Company shall cause the custodian to issue the Key Employee a receipt
          for any Restricted Stock deposited with it in accordance with this
          Paragraph. Such custodian shall hold the deposited certificates and
          deliver the same to the Key Employee in whose name the shares of Stock
          evidenced thereby are registered only after the restrictions
          applicable thereto shall have lapsed.

                                       8
<PAGE>
 
     i.   RIGHTS AS A SHAREHOLDER:  Upon delivery of Restricted Stock to the Key
          Employee (or the custodian, if any) as a Restricted Stock Award, the
          Key Employee shall, except as set forth in Paragraph (c) of this
          Section 8, have all the rights of a shareholder with respect to the
          Restricted Stock, including the right to vote the shares of Restricted
          Stock and receive all dividends or other distributions paid or made
          with respect to the Restricted Stock.

     j.   REPAYMENT TO THE KEY EMPLOYEE: The Company shall repay to the Key
          Employee all amounts, if any, actually paid to the Company by such Key
          Employee for shares of Restricted Stock which are forfeited to the
          Company as a result of the application of the terms of the Plan and/or
          the Award Agreement, such repayment to be in cash or property, as the
          Committee in its sole discretion shall determine.

9.   Stock Appreciation Rights
     -------------------------

          The Committee may, at any time and in its discretion, authorize the
     grant to any Key Employee of the Company who is granted an Award of an
     Option, simultaneously with the grant of such Award, the right (herein
     referred to as a "Stock Appreciation Right") to surrender such Option in
     whole or in part (to the extent such Option is otherwise exercisable) and
     to receive from the Company an amount equal to the excess, if any, of the
     aggregate Fair Market Value of the Stock with respect to which the Option
     is otherwise exercisable on the date such Option is surrendered over the
     Option price of the shares of Stock the subject thereof.  Each Stock
     Appreciation Right shall be subject to the following terms (in addition to
     any other terms contemplated hereunder):

     a.   TERMS:  The Committee in its discretion may limit the period or
          periods during which the Stock Appreciation Rights may be exercised
          and may provide such other terms and conditions (which need not be the
          same with respect to each optionee) under which a Stock Appreciation
          Right may be granted and/or exercised.  A Stock Appreciation Right may
          be exercised only so long as the related Option is exercisable and
          shall terminate on the surrender (except in connection with the
          exercise thereof), termination, expiration or forfeiture of the
          related Option.  In no event may a Stock Appreciation Right be
          exercised more than ten (10) years after the Date of Grant of the
          related Option.

     b.   PAYMENT:  Payment by the Company of the amount receivable by the Key
          Employee upon the exercise of a Stock Appreciation Right may be made
          by the delivery of Stock or cash or any combination of Stock or cash,
          as determined in the sole discretion of the Committee from time to
          time; provided, however, that no cash payment shall be made to such
          Key Employee in respect of a Stock Appreciation Right if such Stock
          Appreciation Right or any related Option shall have been exercised
          during the first six (6) months of their respective terms, except in
          the case of the exercise thereof following the death or Disability of
          the Key Employee to whom such Awards were granted.  No fractional
          shares of Stock 

                                       9
<PAGE>
 
          shall be issued in payment upon the exercise of a Stock Appreciation
          Right, and in lieu of the issuance of fractional shares the Committee
          may provide for the elimination of fractional shares without
          adjustment or for the payment to such Key Employee of the Fair Market
          Value of a whole share of Stock on the date the Stock Appreciation
          Right is exercised multiplied by the fractional share interest
          otherwise issuable, subject to the proviso set forth in the preceding
          sentence.

     c.   TRANSFER:  Stock Appreciation Rights shall not be transferable except
          by will or the laws of descent and distribution and shall be
          transferable only in conjunction with a permitted transfer of the
          Option to which such Stock Appreciation Right relates and only to the
          transferee of such Option.  Stock Appreciation Rights shall be
          exercisable during the lifetime of the Key Employee to whom they are
          granted only by such Key Employee.

     d.   AWARD AGREEMENT:  Each Stock Appreciation Right shall be evidenced by
          an Award Agreement which shall set forth the shares of Stock the
          subject thereof, the Option to which it relates and such other terms
          and conditions as the Committee shall require or otherwise deems
          desirable.

     e.   LIMITATION:  Notwithstanding anything to the contrary contained
          herein, in no event shall the aggregate number of shares of Stock the
          subject of all Stock Appreciation Rights granted to any Key Employee
          under the Plan and then outstanding exceed 33% of the aggregate number
          of shares of Stock the subject of all Options granted to such Key
          Employee under the Plan and then outstanding.

10.  Change of Control
     -----------------

     For the purpose of the Plan, a "Change of Control", shall mean the
     consummation of a Business Combination as defined under Article Seven of
     the Articles of Incorporation of United Cities Gas Company in existence on
     the date the Merger becomes effective.

11.  General
     -------

     a.   GOVERNMENT AND OTHER REGULATIONS:  The obligation of the Company to
          make payment of Awards in Stock or otherwise shall be subject to all
          applicable laws, rules and regulations, and to such approvals by
          governmental agencies as may be required.

     b.   TAX WITHHOLDING:  The Company shall have the right to deduct and
          withhold from all Awards and from the cash and/or Stock issuable upon
          exercise thereof, if any, all federal, state and local taxes required
          by law to be withheld with respect thereto including the right to
          withhold shares of Stock otherwise issuable or deliverable in
          connection with such Award or the exercise thereof having an aggregate
          Fair Market Value on the Date of Grant of the Award or the date of the

                                       10
<PAGE>
 
          exercise thereof, as the case may be, equal to the amount the Company
          is required to withhold.

     c.   CLAIM TO AWARDS AND EMPLOYMENT RIGHTS:  No employee or other person
          shall have any claim or right to be granted an Award under the Plan.
          Neither the Plan nor any action taken hereunder shall be construed as
          giving any employee any right to be retained in the employ of the
          Company.

     d.   NONTRANSFERABILITY:  A person's rights and interests under the Plan,
          including amounts payable, may not be assigned, pledged, hypothecated
          or transferred except, in the event of an employee's death, by will,
          or if there be no will, under the laws of descent and distribution,
          subject at all times to the terms of the Plan.

     e.   INDEMNIFICATION:  Each person who is or shall have been a member of
          the Committee or of the Board shall be indemnified and held harmless
          by the Company against and from any loss, cost, liability, or expense
          that may be imposed upon or reasonably incurred by him or her in
          connection with or resulting from any claim, action, suit, or
          proceeding to which he or she may be a party or in which he or she may
          be involved by reason of any action taken or failure to act under the
          Plan and against and from any and all amounts paid by him or her in
          satisfaction of any judgment in any such action, suit, or proceeding.
          He or she shall give the Company an opportunity, at its own expense,
          to handle and defend the same before he or she undertakes to handle
          and defend it on his or her own behalf. The foregoing right of
          indemnification shall not be exclusive of any other rights of
          indemnification to which such persons may be entitled under the
          Articles of Incorporation or Bylaws of the Company, as a matter of
          law, or otherwise, or any power that the Company may have to indemnify
          them or hold them harmless.

     f.   RELIANCE ON REPORTS:  Each member of the Committee and each member of
          the Board shall be fully justified in relying or acting in good faith
          upon any report made by the firm of independent public accountants
          regularly employed by the Company and upon any other information
          furnished in connection with the Plan by any person other than himself
          or herself. In no event shall any person who is or shall have been a
          member of the Committee or of the Board be liable for any
          determination made or other action taken or any omission to act in
          reliance upon any such report or information or for any action taken,
          including the furnishing of information, or any failure to act, if
          done in good faith.

     g.   RELATIONSHIP TO OTHER BENEFITS:  No compensation payment under the
          Plan shall be taken into account in determining any benefits under any
          pension, retirement, profit sharing, group insurance or other benefit
          plan of the Company.

     h.   EXPENSES: The expenses of administering the Plan shall be borne by the
          Company.

                                       11
<PAGE>
 
     i.   PRONOUNS:  Masculine pronouns and other words of masculine gender
          shall refer to both men and women where the context makes such
          reference appropriate.

     j.   TITLES AND HEADINGS:  The titles and headings of the sections in the
          Plan are for convenience of reference only, and in the event of
          conflict, the text of the Plan, rather than such titles or headings,
          shall control.

     k.   RIGHT AS A SHAREHOLDER: An optionee shall have no right as a
          shareholder with respect to any Stock covered by an Option or
          receivable upon the exercise of an Option or a Stock Appreciation
          Right until such optionee shall have become the registered holder of
          such Stock, and no adjustments shall be made for dividends in cash or
          other property or other distributions or rights in respect of Stock
          for any period or at any time prior to the date upon which such
          optionee in fact shall have become the registered holder of the shares
          of Stock acquired pursuant to the exercise of such Option or Stock
          Appreciation Right.

     l.   GOVERNING LAW: The Plan and all determinations made and actions taken
          in respect thereof shall be governed by and construed in accordance
          with the laws of the State of Illinois.

     m.   SEVERABILITY:  The illegality or unenforceability of any part of the
          Plan shall not affect the legality or enforceability of any other
          provision contained herein.

12.  Changes In Capital Structure
     ----------------------------

          The aggregate number of shares of Stock subject to the Plan, and all
     Options, Stock Appreciation Rights, Restricted Stock Awards and any Award
     Agreements evidencing such Awards, may, at the sole discretion of the
     Committee, be subject to adjustment by the Committee as to the number and
     price of shares of Stock or other consideration subject to such Awards in
     the event of changes in the outstanding Stock by reason of stock dividends,
     stock splits, recapitalizations, reorganizations, mergers, consolidations,
     combinations, exchanges, or other relevant changes in capitalization
     occurring after the Date of Grant of any such Awards.
 
13.  Amendments and Termination
     --------------------------

     a.   RIGHT TO AMEND:  The Board may terminate the Plan, in whole or in
          part, may suspend the Plan, in whole or in part, from time to time,
          including (without limitation) amendments deemed necessary or
          desirable to qualify the Options and/or the Stock Appreciation Rights
          under the rules and regulations promulgated by the Securities and
          Exchange Commission with respect to employees who are subject to the
          provisions of Section 16 of the Exchange Act and under the laws, rules
          and regulations of any governmental regulatory authority or commission
          having jurisdiction over the Company or any Subsidiary, or to correct
          any defect or supply any omission or reconcile any inconsistency in
          the Plan or in any 

                                       12
<PAGE>
 
          Option, Stock Appreciation Right or Restricted Stock Award granted
          hereunder, without the approval of the shareholders of the Company;
          provided, however, that no action shall be taken without the approval
          of the shareholders of the Company to increase the number of shares of
          Stock on which Awards of Stock Appreciation Rights, Restricted Stock
          and Options may be granted except for increases and adjustments made
          pursuant to Section 12 hereof, or change the manner of determining the
          Option price or change the manner of determining the amount payable
          upon exercise of a Stock Appreciation Right or otherwise materially
          increase the benefits accruing to Key Employees under the Plan, or
          change the class of employees eligible to participate or materially
          modify the requirements as to eligibility for participation in the
          Plan, or withdraw administration from the Committee, or permit any
          person while a member of the Committee to be eligible to receive or
          hold an Option, a Stock Appreciation Right or Restricted Stock granted
          under the Plan. 

     b.   REPLACEMENT AND EXTENSION OF TERMS:  The Committee from time to time
          may permit a Key Employee to whom an Option and Stock Appreciation
          Right, if any, has been granted under the Plan to surrender for
          cancellation any unexpired outstanding Option and related Stock
          Appreciation Right, if any, and receive from the Company in exchange
          therefor an Option for such number of shares of Stock as may be
          designated by the Committee, together with related Stock Appreciation
          Rights, if any, as the Committee may determine, all on the terms and
          conditions which the Committee in its sole discretion may prescribe.
          The Committee may extend the duration of any Option and/or Stock
          Appreciation Right for a period not to exceed the remainder of the
          life of the Plan, subject to the other limitations set forth herein,
          on such other terms and conditions as the Committee deems desirable,
          and, in the case of Incentive Stock Options, upon changing the Option
          price thereunder to reflect the present Fair Market Value of each
          share of Stock the subject thereof as of the date of such extension.

     c.   LIMITATION OF AMENDMENTS:  Notwithstanding the foregoing, no amendment
          or termination or modification of the Plan shall in any manner affect
          any Award of an Option, Stock Appreciation Right or Restricted Stock
          theretofore granted without the written consent of the Key Employee to
          whom the Award was granted, except that the Committee may amend or
          modify the Plan in a manner that does affect any Option, Stock
          Appreciation Right or Restricted Stock theretofore granted upon a
          finding by the Committee that such amendment or modification is in the
          best interest of holders of outstanding Options, Stock Appreciation
          Rights or Restricted Stock affected thereby.

                                       13

<PAGE>

                                                                    EXHIBIT 99.2

                           ATMOS ENERGY CORPORATION
                         LONG-TERM STOCK PLAN FOR THE
                      UNITED CITIES GAS COMPANY DIVISION

                          CUMULATIVE AWARD AGREEMENT
                          --------------------------

     THIS AGREEMENT, made this _____  day of July, 1997, between Atmos Energy
Corporation, a Texas corporation (the "Company"), and
___________________________ (the "Optionee"), entered into pursuant to the Atmos
Energy Corporation Long-Term Stock Plan for the United Cities Gas Company
Division, as the same may be amended from time to time (the "Plan").

                                  WITNESSETH:

     WHEREAS, on July 19, 1996, Atmos Energy Corporation (the "Company") and
United Cities Gas Company, an Illinois and Virginia corporation ("United
Cities") entered into that certain Agreement and Plan of Reorganization, which
was amended on October 3, 1996 by Amendment No. 1 to the Agreement and Plan of
Reorganization (collectively, the "Reorganization Agreement"), pursuant to which
United Cities will be merged with and into the Company on July 31, 1997 (the
"Merger") with the Company as the surviving corporation; and
 
     WHEREAS, pursuant to Section 4.9 of the Reorganization Agreement, the
Company agreed to continue in effect the former United Cities Long-Term Stock
Plan of 1989 (the "United Cities Plan"), following the consummation of the
Merger; and
 
     WHEREAS, although it may do so, the Company does not contemplate granting
or awarding any further Incentive Stock Options, Nonqualified Stock Options and
Stock Appreciation Rights or any combination thereof under the Plan.  The
Company also does not contemplate issuing any Restricted Stock, none of which
was issued by United Cities.  The Company plans only to allow all outstanding
grants originally awarded under the United Cities Plan to be exercised, pursuant
to which the holders will receive shares of common stock, no par value of the
Company ("Stock") in lieu of shares of United Cities common stock, no par value
("United Cities Stock"); and
 
     WHEREAS the Optionee was regarded as a "Key Employee", as defined in the
United Cities Plan, and the Compensation Committee of the Board of Directors of
United Cities had determined that it was to the advantage and in the interest of
United Cities to grant the options provided for herein to the Optionee as an
inducement to remain in the service of United Cities or of one of its
subsidiaries ("Subsidiaries") and as an incentive for increased effort during
such service; and

                                       1
<PAGE>
 
     WHEREAS, the Company desires to enter into this Agreement with the Optionee
in order to assume the obligation pursuant to Section 4.9 of the Reorganization
Agreement to issue Stock pursuant to the exercise of all options (both non-
qualified and incentive) and stock appreciation rights ("SARs") granted by
United Cities prior to the consummation of the Merger.

     NOW, THEREFORE, in consideration of the premises and subject to the terms
and conditions set forth herein and in the Plan, the parties hereto agree that
this Agreement is subject in all respects to the terms of the Plan, all of which
terms are made a part of and incorporated into this Agreement, and further agree
as follows:

     1.  Grant of Option
         ---------------

     Pursuant to the provisions of the United Cities Plan, United Cities had
granted, on the dates reflected in Appendix A, to the Optionee an option (the
"Option") to purchase from United Cities pursuant to the type of Option (whether
non-qualified or incentive) set forth in Appendix A, the number of shares of
United Cities Stock set forth in Appendix A at the purchase price set forth in
Appendix A, which was the fair market value as of the date of grant.  Pursuant
to Section 4.9 of the Reorganization Agreement, the Company will assume the
obligation to issue an equivalent number of shares of Stock upon the exercise of
each outstanding Option beginning August 1, 1997.
 
     2.   Period of Exercise of Options
          -----------------------------

     Subject to the provisions of Section 4, "Termination," if the Optionee is
employed by the Company or a Subsidiary on any anniversary date specified in
Appendix A, and has been continuously employed with the Company or a Subsidiary
since the effective time of the Merger on July 31, 1997, then each Option
outstanding on July 31, 1997, as set forth in Appendix A, will vest an
additional twenty percent (20%) on each such anniversary date occurring after
July 31, 1997 and will be exercisable on such date, except to the extent
previously exercised.  Each Option shall expire ten years after the date of its
respective grant.

     3.   Method of Exercise and Payment
          ------------------------------

     An Option shall be exercised by delivery to the Company on any business day
of written notice in a format acceptable to the Company specifying the number of
option shares the Optionee then desires to purchase. The option exercise notice
shall be accompanied by payment of the aggregate option price for such number of
option shares in cash or stock already owned by the person exercising such
Option, or any combination thereof.
 
     Within a reasonable period of time after the Option exercise, the Company
shall issue shares of Stock to the Optionee provided full payment has been
received thereon and the person exercising the Option shall have complied with
all requirements set forth in the Plan this Agreement.

                                       2
<PAGE>
 
     4.   Termination
          -----------
 
          Each Option as set forth in Appendix A shall terminate upon the
          occurrence of the first of the following events:

          A.  The expiration of the Option.

          B.  The termination of the Optionee's employment with the Company or
              Subsidiary, except in the case of the Optionee's retirement, death
              or disability.
 
          C.  The expiration of a three month period commencing on the date of
              the Optionee's retirement.

          D.  The expiration of a one year period commencing on the date of the
              Optionee's termination of employment because of death or
              disability.

          E.  If applicable, the termination of the Option in accordance with
              Section 8, "Result of Exercising SAR's on Related Option."

     5.   Grant of Stock Appreciation Rights
          ----------------------------------

     Pursuant to the provisions of the Plan, United Cities had granted to the
Optionee stock appreciation rights ("SARs") with respect to the number of shares
of United Cities Stock subject to an Option as set forth in Appendix A.
Pursuant to Section 4.9 of the Reorganization Agreement, the Company will assume
the obligation with respect to such SARs beginning July 31, 1997.   SARs shall
entitle the Optionee to surrender such Option in whole or in part, to the extent
such Option is otherwise exercisable, and to receive from the Company cash
and/or shares of Stock in an amount equal to the excess of the aggregate fair
market value of the Stock with respect to which the Option is otherwise
exercisable on the date such Option is surrendered over the option price of the
shares of Stock the subject thereof.

     6.   Period of Exercise of SARs
          --------------------------

     SARs shall be exercisable during the period of time that the corresponding
portion of the applicable Option is exercisable. The Committee may, in its
discretion, impose such conditions upon the exercise of any SARs granted
hereunder as it deems in the best interests of the Optionee or the Company,
including such conditions as may be imposed in accordance with rules promulgated
by the Securities and Exchange Commission.

     7.   Exercise and Payment of SARs
          ----------------------------

     All or any portion of SARs hereby granted shall be exercised by the
Optionee by delivery to the Company on any business day on which such SARs are
exercisable in accordance with Section 6 a written notice in a format acceptable
to the Company specifying the number of option 

                                       3
<PAGE>
 
shares in respect of which the Optionee desires SARs to be exercised. The SAR
exercise notice shall state that the Optionee is surrendering the portion of the
Option relating to the number of option shares covered by the notice.

     The Committee shall determine whether the Optionee will be paid in cash or
in shares of Stock or in any combination thereof.  Any shares of Stock
transferred to the Optionee upon the exercise of any SAR's hereunder shall be
valued at its fair market value on the SAR exercise date.  Within a reasonable
period of time after the SAR exercise, the Company shall deliver shares of Stock
or pay the cash payment, as determined by the Committee, to the Optionee in
consideration of the exercise of SARs and shall cancel the related portion of
the applicable Option as provided in Section 8 below.

     8.   Result of Exercising SARs on Related Option
          -------------------------------------------

     The right of an Optionee to exercise SARs shall terminate to the extent
that such SARs are exercised or to the extent that such Optionee exercises such
applicable Option. The right of an Optionee to exercise such Option shall
terminate to the extent exercised or to the extent that option shares covered by
such Option are used to calculate amounts receivable upon the exercise of SARs
under Section 7 herein.

     9.   Tax Withholding
          ---------------

     The delivery of any Stock certificates by the Company shall not be made
until the Optionee has made arrangements for the payment of any amounts required
to be withheld or paid under any applicable federal, state, or local income
taxes.  Any cash payment shall be made net of any applicable federal, state and
local withholding taxes.

     10.  Construction
          ------------

     Any determination or interpretation by the Committee under this Agreement
shall be final and conclusive on all persons.  In the event of a conflict
between any term of this Agreement and the terms of the Plan, the terms of the
Plan shall control. The Optionee hereby acknowledges receipt of a copy of the
Plan and agrees to be bound by all the terms and provisions thereof.
 
     11.  Amendment
          ---------

     The Committee shall have the right to amend this Agreement from time to
time as provided in the Plan in any manner for the purpose of promoting the
objectives of the Plan, provided that no such amendment shall impair the
Optionee's rights under this Agreement without the Optionee's consent.

     12.  Change of Control
          -----------------
 
     Notwithstanding any other provisions of this Agreement, any Option which
has not expired under its terms and is held by the Optionee at the time of a
Change of Control, with 

                                       4
<PAGE>
 
respect to the Company, which shall mean the consummation of a Business
Combination, as defined under the Articles of Incorporation of United Cities as
they existed at July 31, 1997, shall be exercisable as of the date of such
Change of Control.
 
     13.  Notices
          -------

     Any notice required or permitted under this Agreement shall be in writing
and shall be deemed to have been duly given when received, if delivered
personally, or when mailed, if sent by prepaid first class mail addressed as
follows:
 
          A.  If to the Company or the Committee:

                    Atmos Energy Corporation
                    Attn: Secretary
                    5430 LBJ Freeway
                    Three Lincoln Centre, Suite 1800
                    Dallas, TX  75240

          B.  If to the Optionee, at his address as shown on the records of the
              Company, or at such other address as the Optionee, by notice to
              the Company, may designate in writing from time to time.

     IN WITNESS WHEREOF, Atmos Energy Corporation has caused this Agreement to
be executed on its behalf by its duly authorized officer, and the Optionee has
hereunto set his hand, both as of the day and year first above written.
 

_____________________________________    ____________________________________ 
Chairman of Human Resources Committee                 President
 of the Board of Directors


                                         ____________________________________
                                                     Optionee

                                       5
<PAGE>
 
                                  APPENDIX A
                          CUMULATIVE AWARD AGREEMENT

                           ATMOS ENERGY CORPORATION
                      LONG-TERM STOCK OPTION PLAN FOR THE
                      UNITED CITIES GAS COMPANY DIVISION

                        NAME: _________________________

                   I. INCENTIVE STOCK OPTIONS AS OF 7-31-97

- ----------------------------------------------------------------------------
 Date       Grant      Options    Vesting    Options    Options     Options
Issued    Price ($)    Granted       %       Vested    Exercised   Available  
- ----------------------------------------------------------------------------

- ----------------------------------------------------------------------------

- ----------------------------------------------------------------------------

- ----------------------------------------------------------------------------


                II.A NON-QUALIFIED STOCK OPTIONS AS OF 7-31-97

- ----------------------------------------------------------------------------
 Date       Grant      Options    Vesting    Options    Options     Options
Issued    Price ($)    Granted       %       Vested    Exercised   Available  
- ----------------------------------------------------------------------------

- ----------------------------------------------------------------------------

- ----------------------------------------------------------------------------

- ----------------------------------------------------------------------------

            II.B STOCK APPRECIATION RIGHTS ("SAR'S") AS OF 7-31-97

    --------------------------------------------------------------------
      Date      SAR's      Vesting      SAR's       SAR's        SAR's
     Issued    Granted        %         Vested    Exercised    Available
    --------------------------------------------------------------------

    --------------------------------------------------------------------

    --------------------------------------------------------------------

    --------------------------------------------------------------------

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