DYNEGY INC /IL/
S-3/A, 2000-03-13
CRUDE PETROLEUM & NATURAL GAS
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     As filed with the Securities and Exchange Commission on March 13, 2000.

                                                     Registration No. 333-32036


                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                               Amendment No. 1 to
                                    FORM S-3
                             REGISTRATION STATEMENT
                        UNDER THE SECURITIES ACT OF 1933


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

                                   DYNEGY INC.
             (Exact name of Registrant as specified in its charter)

              Illinois                                          74-2928353
    (State or other jurisdiction                             (I.R.S. Employer
  of incorporation or organization)                       Identification Number)

1000 Louisiana Street, Suite 5800                                  77002
           Houston, Texas                                       (Zip Code)
(Address of Principal Executive Offices)

                               Kenneth E. Randolph
                        1000 Louisiana Street, Suite 5800
                              Houston, Texas 77002
                                 (713) 507-6400
 (Name, Address, Including Zip Code, and Telephone Number, Including Area Code,
                              of Agent For Service)

                                ----------------
                                    Copy to:
                                Julien R. Smythe
                    Akin, Gump, Strauss, Hauer & Feld, L.L.P.
                        1900 Pennzoil Place - South Tower
                                  711 Louisiana
                              Houston, Texas 77002
                                 (713) 220-5800
                                ----------------

            Approximate date of commencement of proposed sale to the public:
From time to time or at one time after the effective date of this registration
statement as determined by the selling stockholder.

            If the only securities being registered on this form are being
offered pursuant to dividend or interest reinvestment plans, please check the
following box. |X|

            If any of the securities being registered on this form are to be
offered on a delayed or continuous basis pursuant to Rule 415 under the
Securities Act of 1933, other than securities offered only in connection with
dividend or interest reinvestment plans, check the following box. |_|

            If this form is filed to register additional securities for an
offering pursuant to Rule 462(b) under the Securities Act, please check the
following box and list the Securities Act registration statement number of the
earlier effective registration statement for the same offering. |_|

            If this form is a post-effective amendment filed pursuant to Rule
462(c) under the Securities Act, check the following box and list the Securities
Act registration statement number of the earlier effective registration
statement for the same offering. |_|

            If delivery of the prospectus is expected to be made pursuant to
Rule 434, please check the following box. |_|

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


The registrant hereby amends this registration statement on such date or dates
as may be necessary to delay its effective date until the registrant shall file
a further amendment which specifically states that this registration statement
shall thereafter become effective in accordance with Section 8(a) of the
Securities Act of 1933 or until the registration statement shall become
effective on such date as the Commission, acting pursuant to said Section 8(a),
may determine.


<PAGE>

                                Explanatory Note

      On February 1, 2000, Dynegy Holdings Inc., a Delaware corporation formerly
known as Dynegy Inc. ("Old Dynegy"), and Illinova Corporation, an Illinois
corporation ("Illinova"), merged with subsidiaries of Dynegy Inc., an Illinois
corporation and the registrant hereunder, formerly known as Energy Convergence
Holding Company ("Dynegy"). As a result of the merger, Old Dynegy and Illinova
are subsidiaries of Dynegy. The merger is more fully described in the Joint
Proxy Statement Prospectus contained within Dynegy's Form S-4 Registration
Statement (File Number 333-84965) filed with the Securities and Exchange
Commission on September 7, 1999. The business of Dynegy consists of the
businesses previously conducted by Old Dynegy, Illinova and their respective
subsidiaries. In connection with the merger, Dynegy assumed all the obligations
of Illinova under Illinova Investment Plus. Immediately subsequent to the
merger, Dynegy amended and restated Illinova Investment Plus and renamed it
Dynegy Investment Plus. This registration statement registers the issuance of
shares by Dynegy under Dynegy Investment Plus.
<PAGE>

                               [DYNEGY INC. LOGO]

                    5,000,000 SHARES OF CLASS A COMMON STOCK

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


                                 March 13, 2000


Dynegy Investment Plus offers you a variety of convenient, low-cost services to
make it easier for you to invest in Class A common stock of Dynegy Inc. The plan
has various features designed for long-term investors who wish to invest and
build their share ownership over time. The plan offers a convenient and
economical means to own shares. Unlike an individual stock brokerage account,
the timing of purchases and sales is subject to the provisions of the plan.
Please read carefully the terms and conditions of the plan.

In addition, the plan will provide Dynegy with a means of raising additional
capital for general corporate purposes through the sale of Class A common stock.
Whether significant additional capital is raised may be affected, in part, by
Dynegy's decision to waive the limitations applicable to optional cash purchases
and, in part, by Dynegy's decision to sell newly issued shares of Class A common
stock to fulfill the requirements of the plan.

You can participate in the plan if you are a registered holder of Dynegy Class A
common stock or a holder of certain equity securities of Illinois Power Company.
If you do not own Class A common stock, you can become a participant by making
your initial purchase directly through the plan. The plan offers you the
opportunity to reinvest dividends and provides an alternative to traditional
methods of buying, holding and selling Class A common stock.

This prospectus contains a more detailed description of the features of the plan
as offered by Dynegy. If you were not a participant in Illinova Investment Plus
and would like to participate in Dynegy Investment Plus, complete the enclosed
enrollment form and mail it to the plan administrator in the reply envelope
provided for your convenience. If you were a participant in Illinova Investment
Plus, you are automatically a participant in Dynegy Investment Plus without
submitting a new enrollment form. If you do not wish to continue participation
in Dynegy Investment Plus, you should submit a Sale/Withdrawal Request Form to
the plan administrator

You should read this prospectus carefully so you know how the plan works and
then retain it for future reference.

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

Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved these securities or determined if this
prospectus is truthful or complete. Any representation to the contrary is a
criminal offense.
<PAGE>

                                TABLE OF CONTENTS

Purpose....................................................................... 1
Key Features of Plan.......................................................... 2
Terms and Conditions of the Plan.............................................. 3
Where You Can Find More Information About Dynegy..............................14
The Company...................................................................16
Use of Proceeds...............................................................16
Legal Matters.................................................................16
Experts.......................................................................16

<PAGE>

                             DYNEGY INVESTMENT PLUS

                                     Purpose

      The purpose of Dynegy Investment Plus is to provide you with a convenient
way to purchase shares of Dynegy Class A common stock and to reinvest all or a
portion of the cash dividends paid on eligible securities in additional shares
of Class A common stock. The plan replaces and assumes, by amendment and
restatement, Illinova Investment Plus. All accounts and all elections, notices,
instructions and authorizations under Illinova Investment Plus automatically
will continue under the plan, and participants in Illinova Investment Plus will
continue as participants in the plan. No action by current participants in
Illinova Investment Plus is required to continue participation in the plan. In
connection with the assumption of Illinova Investment Plus, Dynegy has made some
changes to the plan, including, but not limited to, the following:

      o     The maximum amount allowed for initial and optional investments has
            been changed from $60,000 per year to $10,000 per month;

      o     Under certain circumstances, you may now make initial and optional
            purchases in excess of the monthly maximum;

      o     The minimum amount allowed for an optional cash investment has been
            changed from $25 to $100, except that active employees of New Dynegy
            or one of its subsidiaries may still make optional cash investments
            in even multiples of $1 but not less than $5 per pay period; and

      o     The plan administrator is now Chase Manhattan Bank.

      You should carefully read this prospectus to find out more about Dynegy
Investment Plus. If you wish to continue your participation in Dynegy Investment
Plus you do not need to do anything at this time. If you are a participant in
Illinova Investment Plus and, after reviewing this prospectus, you do not wish
to continue participation in the plan, you should submit a Sale/Withdrawal
Request Form to the plan administrator, Chase Manhattan Bank, c/o ChaseMellon
Shareholder Services, L.L.C., P. O. Box 3338, South Hackensack, New Jersey
07606-1938.


                                       1
<PAGE>

                            Key Features of the Plan

Anyone can participate in the plan

      Interested investors who are not employees of Dynegy or its subsidiaries
or record holders of eligible securities may become participants by making an
initial investment of at least $250 to purchase Class A common stock through the
plan. Employees of Dynegy or its subsidiaries who are not record holders of
eligible securities may become participants by making an initial investment of
at least $100.

How to join the plan

      Record holders of eligible securities may become participants by electing
to have dividend payments on all or a portion of their eligible securities
reinvested in Class A common stock, or by depositing certificates representing
Class A common stock into the plan for safekeeping.

Not all of your dividends have to be reinvested

      You may direct that all or a portion of your dividend payments on eligible
securities be reinvested in additional shares of Class A common stock. Dividend
payments not reinvested will be paid to you in the usual manner.

Optional cash purchases

      In addition to having your dividend payments on eligible securities
reinvested in Class A common stock, you may invest additional funds in Class A
common stock through optional cash investments of at least $100 for any single
investment. Dynegy reserves the right to refuse any optional cash investment
which causes an investor's total investment (initial cash investments plus
optional cash investments plus dividends reinvested) to exceed $10,000 in any
calendar month. In certain instances, however, Dynegy may permit you to make
greater optional cash purchases. Optional cash investments may be made
occasionally or at regular intervals.

Your funds will be fully invested

      Funds paid to the plan are fully invested in Class A common stock through
the purchase of whole shares and fractions of shares.

Share safekeeping

      The plan offers a "safekeeping" service whereby you may deposit, free of
any service charges, certificates representing Class A common stock into the
plan and have your ownership of such Class A common stock maintained on the
administrator's records as part of your account. You can select this service
without participating in any other feature of the plan.

You may sell, withdraw, or transfer your shares at any time

      You may sell or withdraw shares of Class A common stock credited to your
account, including those shares of Class A common stock deposited into the plan
for safekeeping, through the plan. A statement will be mailed to you for each
month in which a transaction takes place. Additionally you may transfer or make
gifts to others of Class A common stock by contacting the administrator.

Plan Administrator

      Chase Manhattan Bank is the administrator. ChaseMellon Shareholder
Services, L.L.C., a registered transfer agent, will provide certain
administrative support to the administrator. You may contact the administrator
by calling 1 (888) 921-5563 or by writing to the administrator at the following
address:


                              Chase Manhattan Bank
                  c/o ChaseMellon Shareholder Services, L.L.C.
                                 P. O. Box 3338
                    South Hackensack, New Jersey 07606-1938.


                                       2
<PAGE>

                        Terms and Conditions of the Plan

Can I participate in the plan?

      Any person or entity, whether or not a record holder of Class A common
stock, is eligible to participate in the plan, provided that

      o     such person or entity fulfills the prerequisites for participation
            described below under "How do I get started?"; and

      o     in the case of citizens or residents of a country other than the
            United States, its territories or possessions, such persons can
            provide the administrator with satisfactory evidence that
            participation would not violate local laws applicable to Dynegy, the
            plan or the participant.

      To the extent required by applicable law in certain jurisdictions, some
persons may be required to be a current record holder of Class A common stock to
participate.

How do I get started?

      You may join the plan at any time after being furnished with a copy of
this prospectus by completing and signing an enrollment form distributed with
this prospectus in the manner set forth below. Requests for copies of enrollment
forms, as well as copies of other plan forms and this prospectus, should be made
in writing or by telephone to the administrator. If you are a record holder of
eligible securities, you should be sure to sign your name on the enrollment form
exactly as it appears on your certificates.

      To become a participant in the plan, you must complete and sign an
enrollment form and return it to the administrator and

      o     make an initial cash investment;

      o     elect to have cash dividends paid on eligible securities of which
            you are the record holder invested in Class A common stock; or

      o     deposit certificates representing shares of Class A common stock
            into the plan for safekeeping.

      If you are a holder of Class A common stock and are currently
participating in Illinova Investment Plus, you will automatically become a
participant in the plan without sending in a new enrollment form. However, if
you wish to change your participation in any way (e.g., from partial to full
reinvestment), you must submit a new enrollment form.

      If you are a current participant in Illinova Investment Plus and want to
end your participation, you may do so at any time by submitting a
Sale/Withdrawal Request Form to the administrator.

      Enrollment forms will be processed as promptly as practicable. You will
become a participant after the administrator receives and approves a properly
completed enrollment form.

What securities are eligible?

      The following equity securities of Dynegy and Illinois Power Company,
Dynegy's indirect wholly owned subsidiary, are eligible to participate in the
plan:

      o     Dynegy Class A common stock (including shares of Class A common
            stock purchased through the plan);

      o     Illinois Power Serial Preferred Stock, $50 par value:

                    4.08% Series Preferred Stock;

                    4.26% Series Preferred Stock;

                    4.70% Series Preferred Stock;

                    4.42% Series Preferred Stock;

                    4.20% Series Preferred Stock; and

                    7.75% Series Preferred Stock.

                                       3
<PAGE>

      In addition, Dynegy may from time to time designate, in its sole
discretion, other equity or debt securities of Dynegy and its subsidiaries as
eligible securities by notifying the administrator in writing of such
designation.

How do I make an initial cash investment and additional optional cash purchases?

      If you are not an employee of Dynegy or its subsidiaries or a record
holder of eligible securities, you must include an initial cash investment of at
least $250 with your completed enrollment form. Employees of Dynegy or its
subsidiaries who are not record holders of eligible securities must include an
initial cash investment of at least $100 with their completed enrollment form.
Such investments may be made

      o     by personal check or money order payable to Dynegy Investment Plus;

      o     by direct debit; or

      o     for active employees of Dynegy or its subsidiaries, by automatic
            payroll deduction (in which case submission of an enrollment form is
            not required).

Do not send cash. You may make additional optional cash investments by
delivering to the administrator a completed enrollment form. Optional cash
investments must be at least $100 for any single investment, except that active
employees of Dynegy or its subsidiaries may make optional cash investments
through payroll deductions in even multiples of $1 but not less than $5 per
period. You can make such an investment

      o     by personal check or money order payable to Dynegy Investment Plus;

      o     by direct debit; or

      o     for active employees of Dynegy or its subsidiaries, by automatic
            payroll deduction (in which case submission of an enrollment form is
            not required).

Do not send cash. Dynegy reserves the right to refuse any optional cash
investment which causes an investor's total investment (initial cash investments
plus optional cash investments plus dividends reinvested) to exceed $10,000 in
any calendar month. In certain instances, however, Dynegy may permit you to make
greater initial investments, as further described in this prospectus. There is
no obligation to make any optional cash investment and the amount and timing of
such investments may vary from time to time.

      Employees participating in the plan may arrange for initial and optional
cash investments under the plan to be made through payroll deductions. A payroll
deduction for optional cash investments may be in even multiples of $1, but not
less than $5 per pay period. To initiate payroll deduction, an employee must
complete, sign and return to the administrator a payroll deduction authorization
form.

      After the administrator has received the payroll deduction authorization
form and the authority for the payroll deduction has been noted on Dynegy's
payroll records, Dynegy will withhold each month the amount authorized. The
withholding will be made each month from the paycheck for the pay period ending
in that month. The amount withheld will be forwarded to the administrator, and
the administrator will invest the funds in Class A common stock beginning on the
first investment date following the administrator's receipt of the funds. The
amount of payroll deduction can be revised, changed or terminated at any time by
written notice to the administrator. Commencement, revision or termination of
payroll deductions will become effective as soon as practicable after the
administrator receives an employee's request.

When are initial and optional cash investments invested?

      An investment date will occur twice every month, as further described in
this prospectus. Initial and optional cash investments will be invested in Class
A common stock beginning on the first investment date following the
administrators receipt of the funds; but the administrator must receive such
investments no later than one business day prior to an investment date to be
invested beginning on that investment date. Otherwise, the administrator may
hold the investment and invest the funds beginning on the next investment date.
No interest will be paid on funds held by the administrator pending investment.

      At your written request, if the administrator receives such request no
later than one business day prior to the applicable investment date, initial and
optional cash investments not already invested in Class A common stock will be
returned to you. However, the administrator will not refund a check or money
order until the administrator

                                       4
<PAGE>

has actually collected the funds from such instruments. Accordingly, such
refunds may be significantly delayed. If the administrator does not receive the
written request to stop investment at least one business day prior to an
investment date, initial and optional cash investments the administrator then
holds will be invested in Class A common stock on such investment date.

      All initial and optional cash investments are subject to collection by the
administrator of full face value in U.S. funds. The method of delivery of any
initial and optional cash investment is at your election and risk, and will be
deemed received when the administrator actually receives them.

      Cash dividends paid on shares of Class A common stock credited to your
account that were purchased through the plan with initial and optional cash
investments will be reinvested in shares of Class A common stock in accordance
with your reinvestment election designated on a completed enrollment form.

How do I make optional cash purchases over the maximum monthly amount?

      Optional cash purchases in excess of $10,000 per month may be made only
pursuant to a request for waiver accepted by Dynegy. If you wish to make an
optional cash purchase in excess of $10,000 for any month, you must obtain
Dynegy's prior written approval and a copy of such written approval must
accompany any such optional cash purchase. You must contact the administrator to
determine if Dynegy is accepting requests for waiver of the maximum monthly
investment, and to obtain a form for requesting a waiver. You then must submit a
request for waiver to the administrator on the form provided by the
administrator. Dynegy has sole discretion to grant any approval for optional
cash purchases in excess of the allowable maximum amount. The administrator will
notify you if Dynegy has accepted your request for waiver. In deciding whether
to approve a request for waiver, Dynegy will consider relevant factors including

      o     whether the plan is then acquiring shares newly issued directly from
            Dynegy or acquiring shares in the open market or in privately
            negotiated transactions from third parties;

      o     Dynegy's need for additional funds;

      o     the attractiveness of obtaining such additional funds through the
            sale of Class A common stock as compared to other sources of funds;

      o     the purchase price likely to apply to any sale of Class A common
            stock;

      o     the shareholder submitting the request;

      o     the extent and nature of such shareholder's prior participation in
            the plan;

      o     the number of shares of Class A common stock held of record by such
            shareholder; and

      o     the aggregate number of optional cash purchases in excess of $10,000
            for which requests for waiver have been submitted by all
            shareholders.

      If requests for waiver are submitted for any month for an aggregate amount
in excess of the amount Dynegy is then willing to accept, Dynegy may honor such
requests in order of receipt, pro rata or by any other method that Dynegy
determines to be appropriate. With regard to optional cash purchases made
pursuant to a request for waiver, the plan does not provide for a predetermined
maximum limit on the amount that a shareholder may invest or on the number of
shares that may be purchased.

What additional provisions apply to optional cash purchases made pursuant to a
request for waiver?

      Optional cash purchases made pursuant to a request for waiver will be
applied to the purchase of shares of Class A common stock as soon as practicable
on or after the following investment date. Optional cash purchases made pursuant
to a request for waiver will be acquired at a price equal to the average of the
daily high and low sales prices computed up to seven decimal places, if
necessary, of the Class A common stock as reported on the New York Stock
Exchange for the five trading days immediately preceding the applicable
investment date. The period encompassing the five trading days immediately
preceding the next following investment date constitutes the relevant "pricing
period". The administrator will apply all optional cash purchases made pursuant
to a request for a waiver for which good funds are received on or before the
first business day before the pricing period to the purchase of shares of Class
A common stock as soon as practicable on or after the next following investment
date.


                                       5
<PAGE>

      Dynegy may establish for a pricing period a minimum threshold price
applicable to optional cash purchases made pursuant to a request for waiver. At
least three business days prior to the first day of the applicable pricing
period, Dynegy will determine whether to establish a threshold price, and if the
threshold price is established, its amount, and will so notify the
administrator. Dynegy will make the determination in its sole discretion after a
review of current market conditions, the level of participation in the plan, and
current and projected capital needs.

      If a threshold price is established for any pricing period, it will be
stated as a dollar amount that the average of the high and low sale prices of
the Class A common stock on the New York Stock Exchange composite tape listing
for each trading day of the relevant pricing period must equal or exceed. If the
threshold price is not satisfied for a trading day in the pricing period, then
that trading day will be excluded from the pricing period and all trading prices
for that day will be excluded from the determination of the purchase price. A
day will also be excluded if no trades of Class A common stock are made on the
New York Stock Exchange for that day. For example, if the threshold price is not
satisfied for one of the five trading days in a pricing period, then the
purchase price will be based upon the remaining four trading days in which the
threshold price was satisfied.

      In addition, a portion of each optional cash purchase will be returned for
each trading day of a pricing period in which the threshold price is not
satisfied or for each day in which no trades of Class A common stock are
reported on the New York Stock Exchange. The returned amount will equal
one-fifth of the total amount of such optional cash purchase (not just the
amount exceeding $10,000) for each trading day that the threshold price is not
satisfied. For example, if the threshold price is not satisfied or no such sales
are reported for one of the five trading days in a pricing period, 1/5 (or 20%)
of such optional cash purchase will be returned without interest.

      The establishment of the threshold price and the possible return of a
portion of the investment apply only to optional cash purchases made pursuant to
a request for waiver. Setting a threshold price for a pricing period shall not
affect the setting of a threshold price for any subsequent pricing period. For
any particular month, Dynegy may waive its right to set a threshold price.
Neither Dynegy nor the administrator shall be required to provide any written
notice as to the threshold price for any pricing period. You may ascertain
whether a threshold price has been set or waived for any given pricing period by
calling the administrator at (212) 273-8200.

      Each investment date, at the same time the threshold price is determined,
Dynegy may establish discounts from the market price applicable to optional cash
purchases made pursuant to a request for waiver. Such waiver discount may be
between 0% and 3% of the purchase price and may vary each investment date. The
waiver discount will be established at Dynegy's sole discretion after a review
of current market conditions, the level of participation in the plan, discounts
requested by investors, the attractiveness of obtaining such additional funds
through the sale of Class A common stock as compared to other sources of funds
and current and projected capital needs. You may determine whether Dynegy will
accept your waiver discount request by calling the administrator at (212)
273-8200. Setting a waiver discount for a particular investment date shall not
affect the setting of a waiver discount for any subsequent investment date. The
waiver discount will apply only to optional cash purchases of more than $10,000.
The waiver discount will apply to the entire optional cash purchase and not just
the portion of the optional cash purchase that exceeds $10,000. Dynegy reserves
the right to establish in the future a discount from the market price for
optional cash purchases of $10,000 or less.

How do I reinvest my cash dividends?

      You may elect to reinvest all or a portion of the cash dividends paid on
all or a portion of the eligible securities registered in your name and in the
plan, i.e. Class A common stock that you purchased through the plan which has
been credited to your account and Class A common stock deposited into the plan
for safekeeping, by designating such election on your enrollment form. If you do
not make an election, cash dividends paid on shares of Class A common stock
credited to your account that were purchased through the plan or deposited into
the plan for safekeeping will be paid in cash. If you elect partial reinvestment
of cash dividend payments on any of your eligible securities, you must designate
the specific security for which such partial reinvestment is desired and the
whole dollar amount or whole number of shares for which reinvestment is desired.
Once you elect reinvestment, cash dividend payments made on the designated
eligible securities will be reinvested in shares of Class A common stock. The
amount so reinvested will be reduced by any amount which is required to be
withheld under any applicable tax or other statutes. If you have specified
partial reinvestment, that portion of cash dividend payments not designated for
reinvestment will be sent to you by check in the usual manner.


                                       6
<PAGE>

How do I change plan options?

      You may change plan options by delivering written instructions or a new
enrollment form to the administrator. Such changes include:

      o     changing your reinvestment level (i.e., full, partial or none) of
            cash dividend payments on eligible securities; and

      o     changing the designation of eligible securities on which cash
            dividend payments are subject to reinvestment.

      To be effective with respect to a particular cash dividend payment, the
administrator must receive any such instructions on or before the record date
relating to such cash dividend payment. If the administrator does not receive
such instructions on or before the record date, the instructions will not become
effective until after such dividend is paid. The shares of Class A common stock
purchased with such funds will be credited to your account.

How often do reinvestments occur?

      An investment date under the plan, i.e. when reinvestments will occur,
will be:

      o     in any month in which a cash dividend on eligible securities is
            paid, such dividend payment date and the 15th day of the month or,
            if either day is not a business day, the business day immediately
            following that day; and

      o     in any month in which no dividend payment occurs, the 1st and 15th
            day of the month or, if either day is not a business day, the
            business day immediately following that day.

Where do the shares purchased come from?

      Shares of Class A common stock purchased for you under the plan will be
either newly issued shares or shares held in the treasury of Dynegy or, at
Dynegy's option, shares of Class A common stock purchased in the open market or
in privately negotiated transactions by an independent agent. Dynegy will not
change the source of shares more than once in any three-month period. Such a
change must be accompanied by a determination by the Dynegy board of directors
or the Chief Financial Officer of Dynegy that there is a valid reason for the
change.

      If Dynegy elects to use newly issued or treasury shares, the administrator
will forward to Dynegy all dividends paid on your shares and any initial and
optional cash investments received from you since the last investment date.
Purchases of shares of Class A common stock from Dynegy, whether newly issued or
treasury shares, will be made on the relevant investment date at the average of
the high and low sales prices of the Class A common stock reported on New York
Stock Exchange composite tape as published in The Wall Street Journal on the
investment date on which such shares are purchased. If no trading occurs in the
Class A common stock on the investment date, the purchase price will be the
average of the high and low sales prices on the next preceding trading day. Such
shares will be issued or sold to, and registered in the name of, the
administrator or its nominee as your custodian. Dynegy will only sell or issue
whole shares to the administrator.

      If Dynegy elects to use shares purchased on the open market, the
administrator will forward to an independent agent all dividends paid on your
shares and any initial and optional cash investments received from you since the
last investment date. The independent agent may be chosen be either Dynegy or
the administrator. Purchases in the open market or in privately negotiated
transactions may begin on the relevant investment date and should be completed
no more than 15 days after that investment date, unless completion at a later
date is necessary or advisable under applicable law, including any federal
securities law. Funds not invested in Class A common stock within 30 days of
receipt will be promptly returned to you. The price of any shares of Class A
common stock purchased or sold in the open market or in privately negotiated
transactions for you will be the weighted average price per share of the
aggregate number of shares purchased or sold, as the case may be, with respect
to the relevant investment date. Such shares will be issued or sold to, and
registered in the name of, the administrator or its nominee as your custodian.

      The number of shares (including any fraction of a share rounded to four
decimal places) of Class A common stock credited to your account for a
particular investment date will be determined by dividing the total amount of
cash dividends, optional cash investments and/or initial cash investments to be
invested for you on such


                                       7
<PAGE>

investment date by the relevant purchase price per share.

      With regard to open market purchases and sales of shares of Class A common
stock by an independent agent, none of Dynegy, the administrator, its agents or
any participant will have any authority or power to direct the time or price at
which shares may be purchased or sold, the markets on which the shares are to be
purchased or sold (including on any securities exchange, in the over-the-counter
market or in negotiated transactions), or the selection of the broker or dealer
(other than any independent agent) through or from whom purchases and sales may
be made.

What is the safekeeping service?

      At the time of enrollment, or at any later time, you may take advantage of
the plan's safekeeping services. Class A common stock that you hold in
certificate form may be deposited into the plan, to be held by the administrator
or its nominee, by delivering a completed enrollment form and the Class A common
stock certificates to the administrator. Such certificates should not be
endorsed. The shares of Class A common stock so deposited will be transferred
into the name of the administrator or its nominee, as custodian, and credited to
your account. Thereafter, such shares of Class A common stock will be treated in
the same manner as shares of Class A common stock purchased under the plan and
credited to your account. Cash dividends paid on shares of Class A common stock
credited to your account that were deposited into the plan for safekeeping will
be reinvested in shares of Class A common stock in accordance with your
reinvestment election designated on the enrollment form.

How can I sell my shares subject to the plan?

      You may request, at any time, that all or a portion of the shares of Class
A common stock credited to your account be sold by delivering to the
administrator a completed Sale/Withdrawal Request Form. Only whole shares of
Class A common stock credited to your account may be sold under the plan. The
administrator will forward the sale instructions to an independent agent within
five business days of receipt (except as described in the following paragraph).
An independent agent will sell such shares as soon as practicable after
processing the request and will transmit to you the proceeds of the sale (less
any brokerage commissions and any applicable transfer taxes and service
charges). Proceeds of shares of Class A common stock sold through the plan will
be paid to you by check.

      If instructions for the sale of shares of Class A common stock on which
cash dividends are not being reinvested are received by the administrator on or
after the record date relating to a dividend payment date (see definition below)
but before the dividend payment date, the sale will be processed and a separate
check for the dividends will be mailed to you following the dividend payment
date. If instructions for the sale of shares of Class A common stock on which
cash dividends are being reinvested are received by the administrator on or
after the record date relating to a dividend payment date but before the
dividend payment date, the dividends paid on the dividend payment date will be
invested in Class A common stock through the plan, and

      o     if your sale instructions cover less than all of the shares of Class
            A common stock credited to your account, the sale of such shares
            will be processed and the shares purchased with the reinvested
            dividends will be credited to your account; or

      o     if your sale instructions cover all of the shares of Class A common
            stock credited to your account, the sale instructions will not be
            processed until after the dividends have been invested in Class A
            common stock through the plan at which time all of the shares
            credited to your account, including the shares purchased with the
            reinvested dividends, will be sold and the proceeds transmitted to
            you.

How do I withdraw shares from the plan?

      You may withdraw some or all of the Class A common stock credited to your
account from the plan at any time by delivering to the administrator

      o     a completed Sale/Withdrawal Request Form, if you will be the record
            holder of such Class A common stock after withdrawal; or

      o     a completed Sale/Withdrawal Request Form and a stock assignment
            (stock power), if you will not be the record holder of the Class A
            common stock after withdrawal.


                                       8
<PAGE>

      Upon the administrator's receipt of the proper documentation, certificates
representing the designated Class A common stock will be sent to you, your
broker or any other person that you have designated.

      If a completed Sale/Withdrawal Request Form with regard to shares of Class
A common stock credited to your account on which cash dividends are not being
reinvested is received on or after the record date relating to a dividend
payment date but before the dividend payment date, the withdrawal will be
processed and a separate check for the dividends will be mailed to you following
the dividend payment date. If a completed Sale/Withdrawal Request Form with
regard to shares of Class A common stock credited to your account on which cash
dividends are being reinvested is received by the administrator on or after the
record date relating to a dividend payment date but before the dividend payment
date, the dividends paid on the dividend payment date will be invested in Class
A common stock through the plan, and

      o     if your withdrawal instructions cover less than all of the shares of
            Class A common stock credited to your account, the withdrawal of
            such shares will be processed and the shares purchased with the
            reinvested dividends will be credited to your account; or

      o     if your withdrawal instructions cover all of the shares of Class A
            common stock credited to your account, the withdrawal instructions
            will not be processed until after the dividends have been invested
            in Class A common stock through the plan, at which time certificates
            representing all of the shares credited to your account, including
            the shares purchased with the reinvested dividends, will be sent to
            you or other designated recipient.

      Certificates representing whole shares of Class A common stock withdrawn
from the plan will be sent to you or designated recipient by first class mail as
soon as practicable following the administrator's receipt of the required
documentation, subject to the provisions of the preceding paragraph. Withdrawal
of shares of Class A common stock does not affect reinvestment of cash dividends
on the shares withdrawn unless

      o     you are no longer the record holder of such shares;

      o     you change such reinvestment by delivering a completed enrollment
            form to the administrator; or

      o     you have terminated your participation in the plan.

How can I transfer or give gifts of shares?

      You may transfer or give gifts of Class A common stock to anyone you
choose by contacting the administrator and requesting a transfer. You may give
or transfer Class A common stock to anyone you choose by:

      o     making an initial $250 cash investment to establish an account in
            the recipient's name;

      o     submitting an optional cash investment on behalf of another
            participant in an amount not less than $100 nor more than $10,000;
            or

      o     transferring Class A common stock from your account to the
            recipient.

      You must transfer a whole number of shares unless you elect to transfer
the entire account. You may transfer shares to new or existing participants. To
transfer the ownership of all or part of the whole shares of Class A common
stock held in your plan account, you must mail the administrator a transfer
request along with a properly signed stock power. A stock power form can be
obtained from the administrator, most banks or most stockbrokers. You must have
your signature guaranteed by a financial institution participating in the
medallion guarantee program. The medallion guarantee program ensures that the
individual signing the certificate is in fact the registered owner as it appears
on the stock certificate or stock power. The administrator will automatically
place such new accounts in full dividend reinvestment status. The recipients of
gifts or transfers, at their discretion, may then elect to change participation
but, to do so, they must submit a new enrollment form to the administrator. The
administrator will send recipients of gifts or transfers a notice of such
transfer.

      If you request to either transfer all of your shares or make a partial
sale and transfer the balance of your shares and such request is received during
the three business days prior to a dividend payment date, the processing of your
request may be held until after your account is credited with reinvested
dividends. This hold period could be as long as four weeks.


                                       9
<PAGE>

What happens if I withdraw a some of my shares in the plan?

      If you are reinvesting cash dividends paid on only a portion of the shares
of Class A common stock credited to your account through the plan and you elect
to sell, withdraw or transfer a portion of such shares, cash dividends on the
remainder of the shares credited to your account, up to the number of shares
designated for reinvestment prior to such sale, withdrawal or transfer, will
continue to be reinvested through the plan, except where you give specific
instructions to the contrary in connection with such sale, withdrawal or
transfer. For example, if you had elected to have cash dividends reinvested
through the plan on 50 shares of a total of 100 shares of Class A common stock
credited to your account elected to sell, withdraw or transfer 25 shares, cash
dividends on 50 shares of the remaining 75 shares credited to your account would
be reinvested through the plan. If instead you elected to sell or withdraw 75
shares, cash dividends on the remaining 25 shares credited to your account would
be reinvested through the plan.

Will I receive reports regarding my account?

      You will receive a statement of account for each month in which an
investment, reinvestment, deposit, withdrawal, sale or any other transaction
takes place. You should retain these statements of account to establish the cost
basis, for tax purposes, of shares of Class A common stock acquired under the
plan.

      You will receive copies of all communications sent to holders of Class A
common stock. This may include quarterly reports to shareholders, annual reports
to shareholders, proxy material, and Internal Revenue Service information, if
appropriate, for reporting dividend income. All notices, statements of account
and other communications from the administrator to you will be addressed to the
latest address of record. Therefore, it is important that you promptly notify
the administrator of any change of address.

How do I obtain a certificate for my shares?

      You may obtain, free of charge at any time, a certificate for all or a
part of the whole shares of Class A common stock credited to your account upon
written request to the administrator. Such certificate(s) will be mailed by
first class mail, within two business days of the administrator's receipt of the
written request, to your address of record. Such shares shall continue to have
their dividends reinvested unless you also submit a enrollment form electing to
not have dividends on such shares reinvested. Any remaining whole or fractions
of shares of Class A common stock will continue to be credited to your account.

      Shares of Class A common stock credited to your account may not be pledged
or assigned. A participant who wishes to pledge or assign shares of Class A
common stock must request that they be withdrawn from the plan.

      Certificates for fractions of shares of Class A common stock will not be
issued under any circumstances.

How do I terminate my participation in the plan?

      You may at any time terminate your participation in the plan by delivering
a completed Sale/Withdrawal Request Form to the administrator. Upon the
administrator's receipt of such written notification, you will receive

      o     a certificate for all of the whole shares of Class A common stock
            credited to your account;

      o     a check for any dividends and cash investments credited to your
            account; and

      o     a check for the cash value of any fraction of a share of Class A
            common stock credited to your account.

      Such fraction of a share will be valued at the average of the high and low
sales prices of the Class A common stock reported on the New York Stock Exchange
composite tape as published in The Wall Street Journal for the trading day
preceding the date of receipt of a completed Sale/Withdrawal Request Form.

Will participation cost me anything?

      Dynegy will pay all administrative costs and expenses associated with the
plan. In addition, Dynegy will pay any brokerage commissions and any applicable
transfer taxes and service charges related to shares purchased under the plan.
Participants requesting that the shares of Class A common stock credited to
their accounts be sold in the open market will be required to pay any brokerage
commissions and any applicable transfer taxes and services charges with respect
to any shares of Class A common stock sold. Such costs will be included as
adjustments to sales prices.


                                       10
<PAGE>

What are the tax consequences?

      The following is a summary of the material Federal Income Tax consequences
of participation in the plan. The effect of such tax consequences on you will
depend upon you individual circumstances which, together with the state and
local tax consequences of participation, should be discussed with your tax
advisor.

      You will be required to include in income for federal income tax purposes
the amount of cash dividends paid on eligible securities and shares of Class A
common stock credited to your account which are reinvested in Class A common
stock under the plan even though no such amount is actually received by you in
cash, but instead is applied to the purchase of shares of Class A common stock
for your account. If shares are purchased in the open market you will also be
required to include in income for federal income tax purposes an allocable share
of any brokerage commissions incurred to purchase such shares.

      Your tax basis for shares of Class A common stock purchased under the plan
will be equal to the price at which the shares are credited by the administrator
to your account. If shares are purchased in the open market, the allocable
shares of any brokerage commissions incurred are added to your tax basis. Shares
of Class A common stock purchased under the plan will have a holding period
beginning on the day after the shares are allocated to your account.

      You will not realize any taxable income when you receive certificates for
whole shares credited to your account under the plan. Gain or loss will be
recognized by you when you sell such whole shares and will be recognized by you
when a fractional share credited to your account is sold pursuant to the terms
of the plan.

What if Dynegy has a stock split, a stock dividend or a rights offering?

      Any shares or other securities representing stock splits or noncash
distributions on shares of Class A common stock credited to your account will be
credited to your account. Stock splits, combinations, recapitalization and
similar events affecting shares of Class A common stock credited to your account
will be credited to your account on a pro rata basis.

      In the event of a rights offering, you will receive rights based upon the
total number of whole shares of Class A common stock credited to your account.

Will I be able to vote my shares purchased through the plan?

      You will have the exclusive right to exercise all voting rights respecting
shares of Class A common stock credited to your account. The administrator will
forward all shareholder materials relating to shares of Class A common stock
credited to your account to you. You may vote any whole shares of Class A common
stock credited to your account in person or by proxy. Your proxy card will
include whole shares of Class A common stock credited to your account and shares
of Class A common stock registered in your name. Shares of Class A common stock
credited to your account will not be voted unless you or your proxy votes them.
You are not permitted to vote fractions of shares.

      Your vote, under a proxy or consent provision that is applicable to all
holders of Class A common stock, and your option to exercise under a tender or
exchange offer may be solicited by Dynegy's management or others. The
administrator will notify you of occasions when you may exercise your voting
rights or your rights with respect to a tender offer or exchange offer within a
reasonable period of time prior to when those rights are to be exercised.

Limitation of liability

      The plan provides that neither Dynegy, the administrator (including Dynegy
if it is acting as such) in administering the plan nor any independent agent
will be liable for any act done in good faith or for the good faith omission to
act in connection with the plan, including, without limitation, any claim of
liability arising out of failure to terminate your account upon your death prior
to receipt of notice in writing of such death, or with respect to the prices at
which shares of Class A common stock are purchased or sold for your account and
the times when such purchases and sales are made, or with respect to any loss or
fluctuation in the market value after the purchase or sale of such shares. The
foregoing does not represent a waiver of any rights you may have under
applicable securities laws.


                                       11
<PAGE>

Interpretation and regulation of the plan

      Dynegy may adopt any rules or regulations with respect to the plan which
are necessary or desirable for the administration of the plan. Dynegy also has
the power and authority to interpret the terms and provisions of the plan and
reconcile any inconsistency or supply any omitted detail so long as it is
consistent with the general terms and provisions of the plan.

Dynegy may change or terminate the plan at its option

      Dynegy may suspend, modify or terminate the plan at any time, in whole, in
part or in respect of participants in one or more jurisdictions, without the
approval of participants. Notice of such suspension, modification or termination
will be sent to all affected participants, who will in all events have the right
to withdraw from participation. Upon any whole or partial termination of the
plan by Dynegy, each affected participant will receive

      o     a certificate for all of the whole shares of Class A common stock
            credited to their account;

      o     a check for any dividends and cash investments credited to their
            account; and

      o     a check for the cash value of any fraction of a share of Class A
            common stock credited to their account.

Such fraction of a share shall be valued at the average of the high and low
sales prices of the Class A common stock reported on the New York Stock Exchange
composite tape as published in The Wall Street Journal for the trading day
preceding the date of termination. You will be notified by the administrator
promptly if the plan is suspended, modified or terminated.

When may Dynegy end my participation in the plan?

      If you do not have at least one whole share of Class A common stock
credited to your account, or do not own any eligible securities for which cash
dividends are designated for reinvestment pursuant to the plan, your
participation in the plan may be terminated by Dynegy upon written notice to
you. Additionally, Dynegy may terminate your participation in the plan after
written notice mailed in advance to you at the address appearing on the
administrator's records. If your participation has been terminated you will
receive

      o     a certificate for all of the whole shares of Class A common stock
            credited to your account;

      o     a check for any dividends and cash investments credited to your
            account; and

      o     a check for the cash value of any fraction of a share of Class A
            common stock credited to your account.

Such fraction of a share shall be valued at the average of the high and low
sales prices of the Class A common stock reported on the New York Stock Exchange
composite tape as published in The Wall Street Journal for the trading day
preceding the date of termination. Dynegy may at any time in its sole discretion
suspend, modify, amend or terminate the plan, in whole, in part or in respect of
participants in one or more jurisdictions. Such amendment may not decrease the
account of any participant or result in a distribution to Dynegy of any amount
credited to the account of any participant.

What if I have questions about the plan?

      Any questions you have about buying or selling shares or any other
services offered by the plan should be directed to the administrator at its
toll-free number:

                                 1-888-921-5563

      A customer service representative will assist you. Once enrolled, you may
also use the administrator's automated voice response system, which will furnish
information regarding your account -- for example, the number of shares held in
the plan, amount of last dividend check or the closing stock price. You may also
write to the administrator at the following address:

                              Chase Manhattan Bank
                  c/o ChaseMellon Shareholder Services, L.L.C.
                                 P. O. Box 3338
                    South Hackensack, New Jersey 07606-1938.

      Be sure to include your name, address, account key and daytime phone
number on all correspondence.


                                       12
<PAGE>

      The administrator has been appointed by Dynegy and such appointment may be
revoked and the administrator may resign at any time with reasonable notice to
Dynegy. If no administrator is appointed, Dynegy will be deemed the plan
administrator. The administrator has the authority to take any actions necessary
to fulfill it's duties under the plan and will keep records of your account.
Dynegy will arrange for the administrator's compensation.

Your acceptance of the terms and conditions of the plan

      By completing the enrollment form or, if you were a participant in
Illinova Investment Plus, by your continuing participation in the plan, you and
your heirs, executors, administrators, legal representatives and assigns
approves and agrees to be bound by the provisions of the plan and any subsequent
amendments to the plan, as well as the actions of Dynegy and the administrator
in connection with the plan.


                                       13
<PAGE>

                Where You Can Find More Information About Dynegy

General

      Dynegy files annual, quarterly and current reports, proxy statements and
other information with the Securities and Exchange Commission. You may read and
copy any documents we have filed at the Commission's Public Reference Section of
the Commission at 450 Fifth Street, N.W., Washington, D.C. 20549 at prescribed
rates. The Commission maintains a Web site at www.sec.gov that contains reports,
proxy and other information regarding Dynegy. In addition, copies of such
reports and other information concerning Dynegy may also be inspected and copied
at the library of the New York Stock Exchange, 20 Broad Street, New York, New
York 10005.

Information we file with the Commission

      The Commission allows us to incorporate by reference the information we
have previously filed with them. Incorporation by reference means that we can
disclose important information to you by referring you to those documents. The
information incorporated by reference is considered to be part of this
prospectus, and later information that we file with the Commission will
automatically update and supersede this information. We incorporate by reference
the documents listed below and future filings made with the Commission by Dynegy
(File Number 1-11156) under Sections 13(a), 13(c), 14 or 15(d) of the Exchange
Act until we sell all the Class A common stock covered by this prospectus.

      o     The description of the Class A common stock in Dynegy's Registration
            Statement on Form 8-A (Securities Act of 1933 Commission File Number
            333-84965) filed on February 2, 2000.

      The following documents previously filed with the SEC by Dynegy
(Commission File Number 1-11156) are incorporated by reference into this
document:

      o     Dynegy's Annual Report on Form 10-K for the fiscal year ended
            December 31, 1999;

      o     Dynegy's Current Report on Form 8-K filed with the SEC on January 6,
            2000, February 2, 2000 and February 29, 2000.

      This prospectus is part of a registration statement that we filed with the
Commission.

      You may request a copy of these filings, at no cost, by writing or calling
us at:

                                  Dynegy Inc.
                       1000 Louisiana Street, Suite 5800
                              Houston, Texas 77002
                                (713) 507-6400.

      Our website address is www.dynegy.com. The information on our web site is
not incorporated by reference into this prospectus. You should rely only on the
information incorporated by references or provided in this prospectus or any
prospectus supplement. We have not authorized anyone else to provide you with
different information. We are only offering these securities in states where the
offer is permitted. You should not assume that the information in this
prospectus or any prospectus supplement is accurate as of any date other than
the date on the front of those documents.


                                       14
<PAGE>

                    UNCERTAINTY OF FORWARD LOOKING STATEMENTS

      This prospectus, any accompanying prospectus supplement and the additional
information described under the heading "Where You Can Find More Information
About Dynegy" may contain forward-looking statements within the meaning of the
Private Securities Litigation Reform Act of 1995. These statements are subject
to risks and uncertainties and are based on the beliefs and assumptions of our
management, based on information currently available to our management. When we
use words such as "believes," "expects," "anticipates," "intends," "plans,"
"estimates," "should" or similar expressions, we are making forward-looking
statements. Forward-looking statements include the information concerning
possible or assumed future results of operations set forth under "Business"
and/or "Management's Discussion and Analysis of Financial Conditions and Results
of Operations" in our annual report on Form 10-K and quarterly reports on Form
10-Q incorporated by reference into this prospectus.

      Forward-looking statements are not guarantees of performance. They involve
risks, uncertainties and assumptions. Our future results and shareholder value
may differ materially from those expressed in these forward-looking statements.
Many of the factors that will determine these results and value are beyond our
ability to control or predict. These statements are necessarily based upon
various assumptions involving judgments with respect to the future including,
among others:

      o     competitive practices in the industries in which Dynegy competes;

      o     fluctuations in commodity prices for natural gas, electricity,
            natural gas liquids, crude oil or coal;

      o     fluctuations in energy commodity prices which have not been properly
            hedged or which are inconsistent with Dynegy's open position in its
            energy marketing activities;

      o     operational and systems risks;

      o     general economic and capital market conditions, including
            fluctuations in interest rates; and

      o     the impact of current and future laws and governmental regulations
            (particularly environmental regulations) affecting the energy
            industry in general and Dynegy's operations in particular.

      You are cautioned not to put undue reliance on any forward-looking
statements. For those statements, we claim the protection of the safe harbor for
forward-looking statements contained in the Private Securities Litigation Reform
Act of 1995.

      You should also consider any other factors contained in this prospectus or
in any accompanying supplement, including the information incorporated by
reference into this prospectus or into any accompanying supplement.


                                       15
<PAGE>

                                   The Company

      Dynegy is a leading provider of energy products and services in North
America and the United Kingdom. On February 1, 2000, Dynegy Inc., a Delaware
corporation (since renamed Dynegy Holdings Inc.) ("Old Dynegy") and Illinova
Corporation, an Illinois corporation ("Illinova"), merged in a transaction in
which Old Dynegy and Illinova became wholly owned subsidiaries of Dynegy. The
merger is more fully described in the Joint Proxy Statement Prospectus contained
within Dynegy's Form S-4 Registration Statement (File Number 333-84965) filed
with the Commission on September 7, 1999.

      Products marketed by Old Dynegy's wholesale marketing operations include
natural gas, electricity, coal, natural gas liquids, crude oil, liquid petroleum
gas and related services. Old Dynegy's wholesale marketing operations are
supported by ownership or control of an extensive asset base and transportation
network that includes unregulated power generation, gas and liquids storage
capacity, gas, power and liquids transportation capacity and gas gathering,
processing and fractionation facilities.

      Illinova is the holding company for: Illinois Power Company, an electric
and natural gas utility that serves approximately 650,000 customers over a
15,000 square-mile area of Illinois; Illinova Generating, Inc., which invests
in, develops and operates independent power projects worldwide; and Illinova
Energy Partners, Inc., which markets energy and energy-related services in the
United States and Canada.

      Our principal office is located at 1000 Louisiana, Suite 5800, Houston,
Texas 77002, and the telephone number is (713) 507-6400.

                                 Use of Proceeds

      Dynegy intends to use the proceeds of the sale of any newly issued or
treasury shares of Class A common stock under the plan for general corporate
purposes. Since the price of the shares of Class A common stock offered under
the plan is based on future market prices, Dynegy is unable to make an advance
determination of the price at which shares of Class A common stock will be sold
to plan participants or the proceeds of such sale.

                   Description of Securities to be Registered

      The authorized capital stock of Dynegy consists of 300,000,000 shares of
Class A common stock, 120,000,000 shares of Class B common stock and 70,000,000
shares of preferred stock. The description of the Class A common stock in
Dynegy's Form S-4 Registration Statement (File Number 333-84965) filed with the
Commission on September 7, 1999 is incorporated by reference into this
prospectus. At February 4, 2000, there were approximately 98 million shares of
Class A common stock issued and outstanding.

                                  Legal Matters

      Troutman Sanders LLP will issue an opinion regarding certain legal matters
in connection with the Class A common stock offered pursuant to this prospectus.

                                     Experts

      The audited consolidated financial statements and schedule of Dynegy
incorporated by reference herein, have been audited by Arthur Andersen LLP,
independent public accountants, as indicated in their report with respect
thereto, and are incorporated by reference herein in reliance upon the authority
of said firm as experts in accounting and auditing in giving said report.


                                       16
<PAGE>

                                   Dynegy Inc.
                        1000 Louisiana Street, Suite 5800
                              Houston, Texas 77002
                                 (713) 507-6400.


                                       17
<PAGE>

               Part II. INFORMATION NOT REQUIRED IN THE PROSPECTUS

      Item 14. Other Expenses of Issuance and Distribution

      The following table sets forth all expenses in connection with the
distribution of the shares of Class A common stock being registered. All amounts
shown below are estimates, except the registration fee:

            Registration fee of Securities and
            Exchange Commission................................$ 64,350.00
            New York Stock Exchange listing fees..................4,375.00
            Accountants' fees and expenses.......................50,000.00
            Legal fees and expenses.............................100,000.00
            Miscellaneous........................................80,000.00

            TOTAL..............................................$298,725.00

      Item 15. Indemnification of Directors and Officers

      Illinois law permits corporations to adopt a provision in their charters
eliminating the liability of a director to the corporation or its shareholders
for monetary damages for breach of the director's fiduciary duty of care.

      Illinois corporations are not permitted to eliminate monetary liability
where such liability is based on:

            (1)   any breach of the director's duty of loyalty to the
                  corporation or its shareholders;

            (2)   acts or omissions not in good faith or that involve
                  intentional misconduct or a knowing violation of law;

            (3)   liability of directors for unlawful payment of dividends or
                  unlawful stock purchases or redemptions; or

            (4)   any transaction from which the director derived an improper
                  personal benefit.

      The Dynegy articles of incorporation also provide for broad mandatory
indemnification, generally extending to any person who is or was a director or
officer who acted in good faith and in a manner he reasonably believed to be not
opposed to the best interests of the corporation. Such articles also eliminate
the liability of directors to the fullest extent permissible under Illinois law,
as such law exists currently or as it may be amended in the future. The Dynegy
bylaws provide that Dynegy may indemnify an employee or agent of the corporation
in a proceeding, including those by or in the right of the corporation, because
he or she is or was acting in the scope of his or her duties, in good faith, and
in a manner he or she reasonably believed to be in the best interests of the
corporation.

      The merger agreement provides that Dynegy will indemnify the present and
former directors and officers of Old Dynegy, Illinova and their respective
subsidiaries and fiduciaries under their benefit plans against all losses,
damages, costs or expenses (including attorneys' fees), liabilities or amounts
paid in settlement arising out of actual or alleged actions or omissions
existing at or before the effective date of the merger. The indemnification will
be to the fullest extent permitted under Illinois law or Dynegy's articles of
incorporation and bylaws in effect on the date of such indemnification and Old
Dynegy's and Illinova's indemnification obligations in effect as of the date of
the merger agreement. Dynegy will also be obligated to advance expenses as
incurred to the fullest extent permitted by law. The determination of compliance
with the indemnification requirements will be made by independent counsel
mutually acceptable to Dynegy and the indemnified person.

      For six years after the effective date of the merger, Dynegy will maintain
Illinova's and Old Dynegy's existing directors' and officers' liability
insurance policies covering the existing directors and officers to the extent
related to liabilities prior to the merger. The coverage will be at least as
favorable as the existing coverage, but Dynegy will not be required to spend
over 150% of the higher of the annual premium paid by Old Dynegy or Illinova for
its existing coverage.

      Item 16. Exhibits

      The Exhibits filed herewith are set forth on the Index to Exhibits filed
as a part of this Registration Statement.

                                      II-1
<PAGE>
      Item 17. 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:

            (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 the registration statement (or the most recent
post-effective amendment thereof) which, individually or in the aggregate,
represent a fundamental change in the information set forth in the registration
statement. Notwithstanding the foregoing, any increase or decrease in volume of
securities offered (if the total dollar value of securities offered would not
exceed that which was registered) and any deviation from the low or high end of
the estimated maximum offering range may be reflected in the form of prospectus
filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the
changes in volume and price represent no more than 20 percent change in the
maximum aggregate offering price set forth in the "Calculation of Registration
Fee" table in the effective registration statement.

            (iii) To include any material information with respect to the plan
of distribution not previously disclosed in the registration statement or any
material change to such information in the registration statement.

            Provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not
apply if the registration statement is on Form S-3, Form S-8 or Form F-3 and 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 the registrant pursuant to Section 13 or Section 15(d) of the
Exchange Act that are incorporated by reference in the 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.

            (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) The undersigned registrant hereby undertakes 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 the 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 the registrant pursuant to the foregoing provisions, or otherwise, the
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 the registrant of expenses
incurred or paid by a director, officer or controlling person of the 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, the 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.


                                      II-2
<PAGE>

                                   SIGNATURES


      Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this Amendment No. 1 to
Registration Statement on Form S-3 to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Houston, State of Texas,
on March 13, 2000.


                                    DYNEGY INC.


                                    By: /s/ C. L. Watson
                                        -------------------------------
                                        C. L. Watson
                                        Chairman of the Board and Chief
                                        Executive Officer


      The undersigned directors and officers of Dynegy hereby constitute and
appoint C. L. Watson and Kenneth E. Randolph with full power to act without the
other and with full power of substitution, our true and lawful attorneys-in-fact
with full power to execute in our name and behalf in the capacities indicated
below any and all amendments (including post-effective amendments and amendments
thereto) to this Amendment No. 1 to Registration Statement on Form S-3 and to
file the same, with all exhibits thereto and other documents in connection
therewith with the Commission and hereby ratify and confirm all that such
attorneys-in-fact, or either of them, or their substitutes shall lawfully do or
cause to be done by virtue hereof.

      Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement on Form S-3 has been signed below by the following
persons in the capacities indicated on March 13, 2000.


Signature                                  Title
- ---------                                  -----


/s/ C.L. Watson                            Chairman of the Board, Director
- ---------------------------------------    and Chief Executive Officer
C. L. Watson                               (Principal Executive Officer)


                  *                        Executive Vice President and
- ---------------------------------------    Chief Financial Officer
John U. Clarke                             (Principal Financial Officer)


                  *                        Senior Vice President and Controller
- ---------------------------------------    (Principal Accounting Officer)
Bradley P. Farnsworth


                  *                        Director
- ---------------------------------------
Charles E. Bayless


                  *                        Director
- ---------------------------------------
Stephen W. Bergstrom


                                      II-3
<PAGE>



Signature                                  Title
- ---------                                  -----


                  *                        Director
- ---------------------------------------
J. Otis Winters


                  *                        Director
- ---------------------------------------
Daniel L. Dienstbier


                  *                        Director
- ---------------------------------------
Patricia A. Woertz


                  *                        Director
- ---------------------------------------
Darald W. Callahan


                  *                        Director
- ---------------------------------------
Richard H. Matzke


                  *                        Director
- ---------------------------------------
J. Joe Adorjan


                  *                        Director
- ---------------------------------------
C. Steven McMillan


                  *                        Director
- ---------------------------------------
Robert M. Powers


                  *                        Director
- ---------------------------------------
Sheli Z. Rosenberg


                  *                        Director
- ---------------------------------------
Joe J. Stewart


                  *                        Director
- ---------------------------------------
John D. Zeglis


* /s/ Kenneth E. Randolph
- ---------------------------------------
      Kenneth E. Randolph, Attorney-in-Fact

<PAGE>

                                INDEX TO EXHIBITS

Exhibit
 Number           Description of Exhibits
 ------           -----------------------


  4.1+            Dynegy Investment Plus

  5.1+            Opinion of Troutman Sanders LLP as to the legality of the
                  shares being registered

  23.1+           Consent of Troutman Sanders LLP (included in the opinion filed
                  as Exhibit 5.1 to this Registration Statement)

  23.2*           Consent of Arthur Andersen LLP

  24.1+           Powers of Attorney (included in the signature page of this
                  Registration Statement)

  99.1+           Cover letter to accompany the prospectus to be sent to
                  participants in Illinova Investment Plus

  99.2+           Cover letter to accompany the prospectus to be sent to holders
                  of eligible securities not participating in Illinova
                  Investment Plus

  99.3+           Enrollment form for Dynegy Investment Plus.

  99.4+           Schedule of anticipated investment dates for Dynegy
                  Investment Plus.

- ----------
* filed herewith

+ filed as exhibit to Dynegy's Registration Statement on Form S-3 filed with
  the Commission on March 9, 2000.




                                                                    EXHIBIT 23.2

                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

As independent public accountants, we hereby consent to the incorporation by
reference in this registration statement of our report dated February 28, 2000
included in Dynegy Inc.'s Form 10-K for the year ended December 31, 1999 and to
all references to our Firm included in this registration statement.


                                        /s/ Arthur Andersen LLP
                                        -----------------------
                                        ARTHUR ANDERSEN LLP

Houston, Texas
March 13, 2000




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