DYNEGY INC
SC 13D/A, 1999-06-18
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>

                         SECURITIES AND EXCHANGE COMMISSION
                               WASHINGTON, D.C. 20549
                                    ------------

                                    SCHEDULE 13D
                                   (RULE 13d-101)

        INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO 13d-1(a)

                 AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2(a)
                                 (AMENDMENT NO. 5)(1)

                                   Dynegy Inc.
- -------------------------------------------------------------------------------
                                (Name of Issuer)

                          Common Stock, $0.01 par value
- -------------------------------------------------------------------------------
                          (Title of Class of Securities)

                                   26816L 10 2
- -------------------------------------------------------------------------------
                                 (CUSIP Number)

               Jack S. Mustoe                         Alan Talkington
          Senior Vice President, Legal       Orrick, Herrington & Sutcliffe LLP
 and General Counsel NOVA Chemicals Corporation      400 Sansome Street
            645 Seventh Avenue S.W.               San Francisco, CA  94111
          Calgary, Alberta Canada T2P 4G8               (415) 773-5762
                  (403) 290-7636
- -------------------------------------------------------------------------------
   (Name, Address and Telephone Number of Person Authorized to Receive Notices
                               and Communications)

                                  June 14, 1999
- -------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

     If the filing person has previously filed a statement on Schedule 13G to
report the acquisition that is the subject of this Schedule 13D, and is filing
this schedule because of Rule 13-1(e), 13d-1(f) or 13d-1(g), check the following
box  / /.

     NOTE:  Schedules filed in paper format shall include a signed original and
five copies, including all exhibits.  SEE Rule 13d-7(b) for other parties to
whom copies are to be sent.
                           (Continued on following pages)


                                (Page 1 of 9 Pages)

- ----------------
(1)    The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities and for any subsequent amendment containing information which would
alter disclosures provided in a prior cover page.

     The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, SEE the
NOTES).


<PAGE>

- --------------------------                             ------------------------
CUSIP NO. 26816L 10 2                 13D                     PAGE 2 OF 8 PAGES
- --------------------------                             ------------------------

- --------------------------------------------------------------------------------
 1     NAMES OF REPORTING PERSONS
       I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
            NOVA Gas Services (U.S.) Inc.


- -------------------------------------------------------------------------------
 2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*           (a)  / /
                                                                   (b)  /X/
- -------------------------------------------------------------------------------
 3     SEC USE ONLY

- -------------------------------------------------------------------------------
 4     SOURCE OF FUNDS*
            WC, OO

- -------------------------------------------------------------------------------
 5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
       TO ITEM 2(d) or 2(e)                                             / /
- -------------------------------------------------------------------------------
 6     CITIZENSHIP OR PLACE OF ORGANIZATION
            Delaware

- -------------------------------------------------------------------------------
   NUMBER OF            7 SOLE VOTING POWER             38,789,876
  SHARES WITH          --------------------------------------------------------
 BENEFICIALLY           8 SHARED VOTING POWER           0
   OWNED BY            --------------------------------------------------------
     EACH               9 SOLE  DISPOSITIVE POWER       38,789,876
   REPORTNG            --------------------------------------------------------
    PERSON             10 SHARED DISPOSITIVE POWER      0
- -------------------------------------------------------------------------------
 11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
            38,789,876

- -------------------------------------------------------------------------------
 12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
       CERTAIN SHARES*                                                  /X/

- -------------------------------------------------------------------------------
 13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
            25.4%

- -------------------------------------------------------------------------------
 14    TYPE OF REPORTING PERSON*
            CO

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

<PAGE>

- --------------------------                             ------------------------
CUSIP NO. 26816L 10 2                 13D                     PAGE 3 OF 8 PAGES
- --------------------------                             ------------------------

- -------------------------------------------------------------------------------
 1     NAMES OF REPORTING PERSONS
       I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
            NOVA Chemicals Corporation


- -------------------------------------------------------------------------------
 2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*           (a)  / /
                                                                   (b)  /X/
- -------------------------------------------------------------------------------
 3     SEC USE ONLY

- -------------------------------------------------------------------------------
 4     SOURCE OF FUNDS*
            WC, OO

- -------------------------------------------------------------------------------
 5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
       TO ITEM 2(d) or 2(e)                                             / /
- -------------------------------------------------------------------------------
 6     CITIZENSHIP OR PLACE OF ORGANIZATION
            Alberta, Canada

- -------------------------------------------------------------------------------
   NUMBER OF       7 SOLE VOTING POWER             0
    SHARES       -------------------------------------------------------------
 BENEFICIALLY
                   8 SHARED VOTING POWER           38,789,876
   OWNED BY      -------------------------------------------------------------
     EACH          9 SOLE  DISPOSITIVE POWER       0
   REPORTNG      -------------------------------------------------------------
  PERSON WITH     10 SHARED DISPOSITIVE POWER      38,789,876

- -------------------------------------------------------------------------------
 11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
            38,789,876
- -------------------------------------------------------------------------------
 12
       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
       CERTAIN SHARES*                                                  /X/

- -------------------------------------------------------------------------------
 13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
            25.4%

- -------------------------------------------------------------------------------
 14    TYPE OF REPORTING PERSON*
            HC
- -------------------------------------------------------------------------------


<PAGE>

- --------------------------                             ------------------------
CUSIP NO. 26816L 10 2                 13D                     PAGE 4 OF 8 PAGES
- --------------------------                             ------------------------

          NOVA Gas Services (U.S.) Inc. (the "Reporting Person") and NOVA
Chemicals Corporation (known prior to January 1, 1999 as NOVA
Corporation), an Alberta, Canada corporation ("NOVA") and the ultimate
parent of the Reporting Person, hereby amend the single joint statement on
Schedule 13D, as amended by Amendments 1, 2, 3 and 4 (the "Schedule 13D"), filed
with the Securities and Exchange Commission, which statement relates to the
shares of Common Stock, par value $0.01 (the "Common Stock"), of Dynegy Inc.
(known prior to July 6, 1998 as NGC Corporation), a Delaware corporation (the
"Issuer") as follows:

ITEM 2.   IDENTITY AND BACKGROUND.

Item 2 shall be deleted and replaced with the following:

          (a, b, c and f)  This Statement is being filed by (i) NOVA Gas
Services (U.S.) Inc., a Delaware corporation (the "Reporting Person"), and
(ii) NOVA Chemicals Corporation (known prior to January 1, 1999 as NOVA
Corporation), an Alberta, Canada, corporation ("NOVA").  The Reporting Person is
a wholly owned subsidiary of NOVA Investments (U.S.) Inc. which is, in turn, a
wholly owned subsidiary of NOVA Chemicals (Canada) Ltd./NOVA Chimie (Canada)
Ltee., which is, in turn, a wholly owned subsidiary of NOVA Petrochemicals Ltd.,
which is in turn a wholly owned subsidiary of NOVA.  The principal office of the
Reporting Person is 400 Frankfort Road, Monaca, Pennsylvania 15601.  The
principal office of NOVA is 645 Seventh Avenue S.W., Calgary, Alberta T2P 4G8
Canada.

          The principal business of the Reporting Person is to hold NOVA's U.S.
gas services investments.  The principal business of NOVA is the manufacturing
and marketing of commodity chemicals.

          Schedules I and II which are attached hereto and incorporated herein
in their entirety by reference, set forth the name, residence or business
address, citizenship and certain employment information of each of the officers
and directors of the Reporting Person and NOVA, respectively.

          (d)  Neither the Reporting Person, nor NOVA, nor to the best knowledge
of either the Reporting Person or NOVA, any entity or person with respect to
which information is provided in response to this Item 2 has, during the last
five years, been convicted in a criminal proceeding (excluding traffic
violations or similar misdemeanors).

          (e)  Neither the Reporting Person, nor NOVA, nor to the best knowledge
of either the Reporting Person or NOVA, any entity or person with respect to
which information is provided in response to this Item has, during the last five
years, been a party to a civil proceeding of a judicial or administrative body
of competent jurisdiction and as a result of such proceeding was or is subject
to a judgment, decree or final order enjoining future violations of, or
prohibiting or mandating activities subject to, federal or state securities laws
or finding any violation with respect to such laws.

<PAGE>

- --------------------------                             ------------------------
CUSIP NO. 26816L 10 2                 13D                     PAGE 5 OF 8 PAGES
- --------------------------                             ------------------------

ITEM 4.   PURPOSE OF TRANSACTION.

The following shall be added before the last paragraph of Item 4:

          On June 14, 1999, the Issuer and Illinova Corporation, an Illinois
corporation ("Illinova"), announced the execution of an Agreement and Plan of
Merger (the "Merger Agreement") and other definitive agreements providing for
the combination (the "Merger") of Illinova and the Issuer.  In connection with
the Merger Agreement, the Reporting Person entered into a Voting Agreement (the
"Dynegy Voting Agreement") in which it, among other things, agreed, subject to
the terms thereof (i) to vote in favor of the Merger, (ii) to vote against
certain other transactions, (iii) to waive any provisions of the New NGC
Stockholders Agreement with respect to actions contemplated by the Merger
Agreement and (iv) to not sell, pledge or otherwise transfer any of the shares
of Common Stock.  The Dynegy Voting Agreement terminates upon the first to occur
of the termination of the Merger Agreement and the date of the consummation of
the Merger.  The Merger Agreement and the Dynegy Voting Agreement are attached
as Exhibits 15 and 16, respectively.

          Under the terms of the Merger Agreement, the Issuer's stockholders may
elect to convert their shares of Common Stock into cash (at a fixed price of
$16.50 per share of Common Stock) or common shares of the combined company (at a
fixed exchange ratio of 0.69 shares of the combined company for every share of
Common Stock).  The Reporting Person has agreed to elect to convert its shares
of Common Stock into cash in the Merger pursuant to the Affiliate Agreement
attached as Exhibit 18.  However, if there is insufficient cash for the combined
company to exchange all of the Reporting Person's shares of Common Stock into
cash (due to other stockholders electing cash), then the remainder of such
shares of Common Stock shall be exchanged for convertible preferred stock (the
"Preferred Stock") of the combined company.  The amount of Preferred Stock to be
received by the Reporting Person will depend on the amount of cash elected by
the other stockholders of the Issuer and on the market price of Illinova common
shares prior to the closing of the Merger.  The terms of the Preferred Stock are
described in the Statement of Resolution Establishing Series of Series A
Convertible Preferred Stock attached as Exhibit B to the Merger Agreement.  The
Reporting Person also will receive registration rights covering its Preferred
Stock and the common stock of the combined company into which the Preferred
Stock may be converted.  The Registration Rights Agreement is attached as
Exhibit 17.

          The foregoing descriptions of the Merger Agreement, the Dynegy Voting
Agreement, the Registration Rights Agreement and the Affiliate Agreement are
qualified in their entirety by reference to the complete copies of such
agreements attached or incorporated by reference as exhibits below.

<PAGE>

- --------------------------                             ------------------------
CUSIP NO. 26816L 10 2                 13D                     PAGE 6 OF 8 PAGES
- --------------------------                             ------------------------

ITEM 5.        INTEREST IN SECURITIES OF THE ISSUER.

Item 5 shall be deleted and replaced with the following:

      (a) In computing their respective aggregate percentage ownership of
          Common Stock and the percentages of Common Stock owned by the other
          parties to the New NGC Stockholders Agreement for purposes of this
          Schedule 13D, the Reporting Person and NOVA have relied on the
          quarterly report on Form 10-Q for the quarterly period ended
          March 31, 1999, (Commission File No.1-11156) in which the Issuer
          reported that 152,864,662 shares of Common Stock were outstanding.
          As of the close of business on June 14, 1999, the Reporting Person
          was the beneficial owner of 38,789,876 shares of Common Stock,
          constituting approximately 25.4% of the shares of Common Stock
          outstanding.

          NOVA does not own any shares of the Issuer directly, but may be deemed
          to share beneficial ownership of all of the shares of Common Stock
          owned by the Reporting Person by virtue of the ownership relationship
          described in Item 2.

          To the knowledge of the Reporting Person and NOVA, only the following
          persons listed on Schedules I and II owns any of the Issuer's shares
          of Common Stock:

<TABLE>
<CAPTION>
                        Name                   Number of Shares
                        ----                   ----------------
                 <S>                           <C>
                 Jeffrey M. Lipton                     10,251*
                 A. Terence Poole                       6,189
                 Jack S. Mustoe                         2,757
                 Robert L. Pierce                         500
</TABLE>

          *Includes 800 shares held indirectly.

          The Reporting Person and NOVA disclaim ownership of any such shares of
          Common Stock.

      (b) Subject to its obligations under the agreements described in this
          Schedule 13D, the Reporting Person has the sole power to vote and
          dispose of the 38,789,876 shares of Common Stock owned directly by it.
          Although the Reporting Person has sole voting rights, NOVA may be
          deemed to share voting and dispositive power with regard to such
          shares by virtue of its ownership of 100% of the Reporting Person.

<PAGE>

- --------------------------                             ------------------------
CUSIP NO. 26816L 10 2                 13D                     PAGE 7 OF 8 PAGES
- --------------------------                             ------------------------

     (c)  The Reporting Person had no transactions in the shares of Common Stock
          in the sixty-day period ended June 14, 1999.

     (d)  Except as described above, no other person is known to have the right
          to receive or the power to direct the receipt of dividends from or the
          proceeds from the sale of such shares of Common Stock beneficially
          owned by the Reporting Person and NOVA.

     (e)  Not applicable.

ITEM 6.   CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH
          RESPECT TO SECURITIES OF THE ISSUER.


The following shall be added before the last paragraph of Item 6:

          The contracts, arrangements, understandings and relationships with
respect to the Merger and related transactions are described in Item 4 and
are incorporated by reference in response to this Item 6.

ITEM 7.   MATERIAL TO BE FILED AS EXHIBITS.

The following shall be added after the last Exhibit in Item 7:

     15.  Agreement and Plan of Merger, dated as of June 14, 1999, by and among
Illinova Corporation, an Illinois corporation, Energy Convergence Holding
Company, an Illinois corporation, Dynegy Acquisition Corporation, a Delaware
corporation, Energy Convergence Acquisition Corporation, an Illinois
corporation, and Dynegy Inc., a Delaware corporation (incorporated by reference
to Exhibit 2.1 to the Issuer's Current Report on Form 8-K dated June 14, 1999).

     16.  Voting Agreement, dated as of June 14, 1999, by and between Illinova
Corporation, an Illinois corporation, and NOVA Gas Services (U.S.) Inc., a
Delaware corporation (incorporated by reference to Exhibit 10.4 to the Issuer's
Current Report on Form 8-K dated June 14, 1999).

     17.  Registration Rights Agreement, dated as of June 14, 1999, by and among
Energy Convergence Holding Company, an Illinois corporation, British Gas
Atlantic Holdings BV, a Netherlands corporation, and NOVA Gas Services (U.S.)
Inc., a Delaware corporation (incorporated by reference to Exhibit 10.7 to the
Issuer's Current Report on Form 8-K dated June 14, 1999).

     18.  Affiliate Agreement, dated as of June 14, 1999, by NOVA Gas Services
(U.S.) Inc., a Delaware corporation, to Energy Convergence Holding Company, an
Illinois corporation.

<PAGE>

- --------------------------                             ------------------------
CUSIP NO. 26816L 10 2                 13D                     PAGE 8 OF 8 PAGES
- --------------------------                             ------------------------

          After reasonable inquiry and to the best of the undersigneds'
knowledge and believe, the undersigned hereby certify that the information set
forth in this statement is true, complete and correct.

Dated:  June 18, 1999

                         NOVA CHEMICALS CORPORATION


                         By:  /s/ Bentley Woudstra
                              -------------------------------------------
                              Name:     Bentley Woudstra
                              Title:    Vice President and Corporate Secretary

                         NOVA GAS SERVICES (U.S.) INC.

                         By:  /s/ Ernest V. Dean
                              -------------------------------------------
                              Name:     Ernest V. Dean
                              Title:    Secretary

<PAGE>


                                     SCHEDULE I


       Set forth below is the information required by Item 2 of Schedule 13D
      for each executive officer and director of NOVA Gas Services (U.S.) Inc.


<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------------------
 NAME                      DIRECTOR/           CITIZENSHIP    PRINCIPAL                                           BUSINESS OF
                           OFFICER                            OCCUPATION           NAME AND ADDRESS OF EMPLOYER   EMPLOYER
- -----------------------------------------------------------------------------------------------------------------------------------
 <S>                       <C>                 <C>            <C>                  <C>                            <C>
 Ernest V. Dean            Director/Officer    U.S.           Secretary            NOVA Chemicals Inc.            See Item 2
                                                                                   400 Frankfort Road
                                                                                   Monaca, Pennsylvania
                                                                                   15061
- -----------------------------------------------------------------------------------------------------------------------------------
 Jeffrey M. Lipton         Director            U.S.           President and Chief  NOVA Chemicals Corporation     See Item 2
                                                              Executive Officer    2300 - 645 7th Avenue S.W.
                                                              of NOVA Chemicals    Calgary, Alberta
                                                              Corporation          T2P 4G8
- -----------------------------------------------------------------------------------------------------------------------------------
 Jack S. Mustoe            Director            Canada         Senior Vice          NOVA Chemicals Corporation     See Item 2
                                                              President, Legal     2300 - 645 7th Avenue S.W.
                                                              and General Counsel  Calgary, Alberta
                                                              of NOVA Chemicals    T2P 4G8
                                                              Corporation
- -----------------------------------------------------------------------------------------------------------------------------------
 John R. Umlah             Director/Officer    U.S.           President            NOVA Chemicals Inc.            See Item 2
                                                                                   400 Frankfort Road
                                                                                   Monaca, Pennsylvania
                                                                                   15061
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

                                                                I-1

<PAGE>


                                     SCHEDULE II

       Set forth below is the information required by Item 2 of Schedule 13D
       for each executive officer and director of NOVA Chemicals Corporation.


<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------------------------
                           OFFICER/                           PRINCIPAL                                          BUSINESS OF
 NAME                      DIRECTOR            CITIZENSHIP    OCCUPATION           NAME AND ADDRESS OF EMPLOYER  EMPLOYER
- -----------------------------------------------------------------------------------------------------------------------------------
 <S>                       <C>                 <C>            <C>                  <C>                           <C>
 Dr. F. Peter Boer         Director            U.S.           President and Chief  Tiger Scientific, Inc.        Science and
                                                              Executive Officer    47 Country Road South         technology,
                                                              of Tiger             Village of Golf, Florida      consulting and
                                                              Scientific, Inc.     33436                         investments
                                                                                   U.S.A.
- -----------------------------------------------------------------------------------------------------------------------------------
 Robert E. Dineen, Jr.     Director            U.S.           Partner of Shearman  Shearman & Sterling           Attorneys-at-Law
                                                              & Sterling           566 Lexington Avenue
                                                                                   New York. N.Y.  10022
                                                                                   U.S.A.
- -----------------------------------------------------------------------------------------------------------------------------------
 L. Yves Fortier, C.C.,    Director            Canadian       Chairman and Senior  Ogilvy Renault                Barristers and
 Q.C.                                                         Partner of Ogilvy    1981 McGill College Avenue,   Solicitors
                                                              Renault              Suite 1200
                                                                                   Montreal, PQ
                                                                                   H3A 3C1
- -----------------------------------------------------------------------------------------------------------------------------------
 Kerry L. Hawkins          Director            Canadian       President of         Cargill Limited               Grain handlers
                                                              Cargill Limited      Box 5900                      and merchants,
                                                                                   300, 240 Graham Avenue        transporters and
                                                                                   Winnipeg, MB                  processors of
                                                                                   R3C 4C5                       agricultural
                                                                                                                 products
- -----------------------------------------------------------------------------------------------------------------------------------
 Jeffrey M. Lipton         Director/Officer    U.S.           President and Chief  NOVA Chemicals Corporation    See Item 2
                                                              Executive Officer    2300 - 645 7th Avenue S.W.
                                                              of NOVA Chemicals    Calgary, Alberta
                                                              Corporation          T2P 4G8
- -----------------------------------------------------------------------------------------------------------------------------------
 Gerald J. Maier           Director            Canadian       Chairman Emeritus    TransCanada PipeLines         Energy services
                                                              of TransCanada       Limited
                                                              PipeLines and Vice   3400, 237 Fourth Avenue S.W.
                                                              Chairman of NOVA     Calgary, Alberta
                                                              Chemicals            T2P 5A4
                                                              Corporation
- -----------------------------------------------------------------------------------------------------------------------------------
 James M. Edward (Ted)     Director            Canadian       Chairman of NOVA     Newall and Associates         See Item 2
 Newall O.C.                                                  Chemicals            2015, 855 - 2nd Street S.W.
                                                              Corporation          Calgary, Alberta
                                                                                   T2P 4J8
- -----------------------------------------------------------------------------------------------------------------------------------
 Dr. Nicholas Pappas       Director            U.S.           President and Chief  BioTraces, Inc.               Environmental
                                                              Executive Officer    606 Swallow Hollow Road       consulting
                                                              of BioTraces, Inc.   Centerville, Delaware  19807
                                                                                   U.S.A.
- ----------------------------------------------------------------------------------------------------------------------------------
 Robert L. Pierce, Q.C.    Director            U.S./Canadian  Chairman and Chief   Foothills Pipe Lines Ltd.     Pipeline
                                                              Executive Officer    c/o 33rd Floor, 707 - 8th     transportation
                                                              of Foothills Pipe    Avenue S.W.
                                                              Lines Ltd.           Calgary, Alberta
                                                                                   T2P
- -----------------------------------------------------------------------------------------------------------------------------------

                                                                II-1

<PAGE>

- ----------------------------------------------------------------------------------------------------------------------------------
                           OFFICER/                           PRINCIPAL                                           BUSINESS OF
 NAME                      DIRECTOR            CITIZENSHIP    OCCUPATION           NAME AND ADDRESS OF EMPLOYER   EMPLOYER
- -----------------------------------------------------------------------------------------------------------------------------------
 <S>                       <C>                 <C>            <C>                  <C>                            <C>
 Janice G. Rennie, F.C.A.  Director            Canadian       President of         Research Technology            Technology
                                                              Research Technology  Management Inc.                consulting
                                                              Management Inc.      720 University Extension
                                                                                   Centre
                                                                                   8303 - 112 Street
                                                                                   Edmonton, Alberta
                                                                                   T6G 1K4
- -----------------------------------------------------------------------------------------------------------------------------------
 Joseph D. Thompson        Director            Canadian       Chairman of PCL      PCL Construction Group Inc.    General
                                                              Construction Group   5410 - 99th Street             construction
                                                              Inc.                 Edmonton, Alberta              contractors
                                                                                   T6E 3P4
- -----------------------------------------------------------------------------------------------------------------------------------
 A. Terence Poole          Officer             Canadian       Executive Vice       NOVA Chemicals Corporation     See Item 2
                                                              President, Finance   2300 - 645 7th Avenue S.W.
                                                              and Strategy of      Calgary, Alberta
                                                              NOVA Chemicals       T2P 4G8
                                                              Corporation
- -----------------------------------------------------------------------------------------------------------------------------------
 Daniel W. Boivin          Officer             Canadian       Senior Vice          NOVA Chemicals Corporation     See Item 2
                                                              President and        2300 - 645 7th Avenue S.W.
                                                              President, Olefins/  Calgary, Alberta
                                                              Polyolefins of NOVA  T2P 4G8
                                                              Chemicals
                                                              Corporation
- -----------------------------------------------------------------------------------------------------------------------------------
 Wes W. Lucas              Officer             U.S.           Senior Vice          NOVA Chemicals Inc.            Manufacturing and
                                                              President and        400 Frankfort Road             marketing of
                                                              President,           Monaca, Pennsylvania           commodity
                                                              Styrenics of NOVA    15061                          chemicals
                                                              Chemicals
                                                              Corporation
- -----------------------------------------------------------------------------------------------------------------------------------
 Wayne E. Lunt             Officer             Canadian       Senior Vice          NOVA Chemicals Corporation     See Item 2
                                                              President and Chief  2300 - 645 7th Avenue S.W.
                                                              Financial Officer    Calgary, Alberta
                                                              of NOVA Chemicals    T2P 4G8
                                                              Corporation
- -----------------------------------------------------------------------------------------------------------------------------------
 Lawrence A. MacDonald     Officer             Canadian       Senior Vice          NOVA Chemicals Corporation     See Item 2
                                                              President,           2300 - 645 7th Avenue S.W.
                                                              Manufacturing East   Calgary, Alberta
                                                              of NOVA Chemicals    T2P 4G8
                                                              Corporation
- -----------------------------------------------------------------------------------------------------------------------------------
 Jack S. Mustoe            Officer             Canadian       Senior Vice          NOVA Chemicals Corporation     See Item 2
                                                              President, Legal     2300 - 645 7th Avenue S.W.
                                                              and General Counsel  Calgary, Alberta
                                                              of NOVA Chemicals    T2P 4G8
                                                              Corporation
- -----------------------------------------------------------------------------------------------------------------------------------
 Sheila H. O'Brien         Officer             Canadian       Senior Vice          NOVA Chemicals Corporation     See Item 2
                                                              President, Human     2300 - 645 7th Avenue S.W.
                                                              Resources, Public    Calgary, Alberta
                                                              Affairs and          T2P 4G8
                                                              Investor Relations
                                                              of NOVA Chemicals
                                                              Corporation

- -----------------------------------------------------------------------------------------------------------------------------------
 Dale H. Spiess            Officer             U.S.           Senior Vice          NOVA Chemicals Inc.            Manufacturing and
                                                              President,           200 Cliff Mine Road            marketing of
                                                              Polyethylene Sales   Pittsburgh, Pennsylvania       commodity
                                                              and Marketing of     15275                          chemicals
                                                              NOVA Chemicals
                                                              Corporation

- -----------------------------------------------------------------------------------------------------------------------------------
 John L. Wheeler           Officer             U.S.           Senior Vice          NOVA Chemicals Corporation     See Item 2
                                                              President and        2300 - 645 7th Avenue S.W.
                                                              Chief Information    Calgary, Alberta
                                                              Officer of NOVA      T2P 4G8
                                                              Chemicals
                                                              Corporation
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>

                                    EXHIBIT INDEX


     EXHIBIT


     15.  Agreement and Plan of Merger, dated as of June 14, 1999, is by and
among Illinova Corporation, an Illinois corporation, Energy Convergence Holding
Company, an Illinois corporation, Dynegy Acquisition Corporation, a Delaware
corporation, Energy Convergence Acquisition Corporation, an Illinois
corporation, and Dynegy Inc., a Delaware corporation (incorporated by reference
to Exhibit 2.1 to the Issuer's Current Report on Form 8-K dated June 14, 1999).

     16.  Voting Agreement, dated as of June 14, 1999, by and between Illinova
Corporation, an Illinois corporation, and NOVA Gas Services (U.S.) Inc., a
Delaware corporation (incorporated by reference to Exhibit 10.4 to the Issuer's
Current Report on Form 8-K dated June 14, 1999).

     17.  Registration Rights Agreement, dated as of June 14, 1999, by and among
Energy Convergence Holding Company, an Illinois corporation, British Gas
Atlantic Holdings BV, a Netherlands corporation, and NOVA Gas Services (U.S.)
Inc., a Delaware corporation (incorporated by reference to Exhibit 10.7 to the
Issuer's Current Report on Form 8-K dated June 14, 1999).

     18.  Affiliate Agreement, dated as of June 14, 1999, by NOVA Gas Services
(U.S.) Inc., a Delaware corporation, to Energy Convergence Holding Company, an
Illinois corporation.


<PAGE>

                                                                      Exhibit 18


                                   June 14, 1999



Energy Convergence Holding Company
c/o Dynegy Inc.
1000 Louisiana Street, Suite 5800
Houston, Texas  77002

Ladies and Gentlemen:

          Reference is made to the Agreement and Plan of Merger (the "Merger
Agreement") dated as of the date hereof among Illinova Corporation, an Illinois
corporation ("Illinova"), Energy Convergence Holding Company, an Illinois
corporation ("Newco"), Dynegy Acquisition Company, a Delaware corporation, and a
wholly owned subsidiary of Newco ("DAC"), Energy Convergence Acquisition
Company, an Illinois corporation, and a wholly owned subsidiary of Newco
("IAC"), and Dynegy Inc., a Delaware corporation ("Dynegy"), pursuant to which
DAC will be merged with and into Dynegy, and IAC will be merged with and into
Illinova.

          Pursuant to the terms and conditions of the Merger Agreement, the
undersigned hereby agrees that it will make or cause to be made an election
pursuant to Section 4.1(d) of the Merger Agreement to receive Cash Election
Shares (as defined in the Merger Agreement) and that upon consummation of the
transactions contemplated thereby, each share of common stock, par value $.01
per share, of Dynegy owned by the undersigned as of the Effective Time (as
defined in the Merger Agreement) will be converted into and exchangeable for
cash and certain securities of Newco.

          The undersigned understands that it may be deemed to be an "affiliate"
of Dynegy or Illinova for purposes of Rule 145 promulgated under the Securities
Act of 1933, as amended (the "Act"). The undersigned is delivering this letter
of undertaking and commitment pursuant to Section 8.17 of the Merger Agreement.

          With respect to such securities of Newco as may be received by the
undersigned pursuant to the Merger Agreement (the "Shares"), the undersigned
represents to and agrees with Newco that:

          A.   The undersigned will not make any offer to sell or any sale or
other disposition of all or any part of the Shares in violation of the Act or
the rules and regulations thereunder, including Rule 145, and will hold all the
Shares subject to all applicable provisions of the Act and the rules and
regulations thereunder.

<PAGE>

Energy Convergence Holding Company
June 14, 1999
Page 2


          B.   The undersigned has been advised that the offering, sale and
delivery of the Shares to the undersigned pursuant to the Merger Agreement will
be registered under the Act on a Registration Statement on Form S-4. The
undersigned has also been advised, however, that, since the undersigned may be
deemed an "affiliate" of Dynegy or Illinova, any public reoffering or resale by
the undersigned of any of the Shares will, under current law, require either (i)
the further registration under the Act of the Shares to be sold, (ii) compliance
with Rule 145 promulgated under the Act (permitting limited sales under certain
circumstances) or (iii) the availability of another exemption from registration
under the Act.

          C.   The undersigned also understands that, if Newco should deem it
necessary to comply with the requirements of the Act, stop transfer instructions
will be given to its transfer agents with respect to the Shares and that there
will be placed on the certificates for the Shares, or any substitutions
therefor, a legend stating in substance:

          "The securities represented by this certificate were issued in a
          transaction under Rule 145 promulgated under the Securities Act of
          1933, as amended (the "Act"), and may be sold, transferred or
          otherwise disposed of only upon receipt by the Corporation of an
          opinion of counsel acceptable to it that the securities are being sold
          in compliance with the limitations of Rule 145 or that some other
          exemption from registration under the Act is available, or pursuant to
          a registration statement under the Act."

          Execution of this letter shall not be considered an admission on the
part of the undersigned that the undersigned is an "affiliate" of Dynegy or
Illinova for purposes of Rule 145 under the Act or as a waiver of any rights the
undersigned may have to any claim that the undersigned is not such an affiliate
on or after the date of this letter.

                                        Very truly yours,


                                        /s/ Jack S. Mustoe

                                        Jack S. Mustoe,
                                        Senior Vice President, Legal
                                        & General Counsel




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