ILLINOIS POWER COMPANY

                              AND

              THE FIRST NATIONAL BANK OF CHICAGO,
                           AS TRUSTEE




                  FIRST SUPPLEMENTAL INDENTURE

                  DATED AS OF OCTOBER 1, 1994

                               TO

                           INDENTURE


                  DATED AS OF OCTOBER 1, 1994




9.45% SUBORDINATED DEBENTURES, SERIES A, DUE SEPTEMBER 30, 2043



           THIS FIRST SUPPLEMENTAL INDENTURE, dated as of the 1st
day  of  October,  1994  (this "First  Supplemental  Indenture"),
between ILLINOIS POWER COMPANY, a corporation duly organized  and
existing under the laws of the State of Illinois (the "Company"),
and  THE  FIRST  NATIONAL  BANK OF CHICAGO,  a  national  banking
association organized and existing under the laws of  the  United
States of America, as trustee (the "Trustee") under the Indenture
dated  as of October 1, 1994 between the Company and the  Trustee
(the  "Indenture").   All terms used and not defined  this  First
Supplemental Indenture are used as defined in the Indenture.

            WHEREAS,  the  Company  executed  and  delivered  the
Indenture  to the Trustee to provide for the future  issuance  of
its  subordinated debentures (the "Debentures"), said  Debentures
to  be  issued from time to time in series as might be determined
by  the  Company  under the Indenture, in an unlimited  aggregate
principal  amount which may be authenticated and delivered  under
the Indenture as provided in the Indenture; and

           WHEREAS,  pursuant to the terms of the Indenture,  the
Company desires to provide for the establishment of a new  series
of   its  Debentures  to  be  known  as  its  9.45%  Subordinated
Debentures,  Series  A, due September 30,  2043  (the  "Series  A
Debentures"), the form and substance of such Series A  Debentures
and  the  terms,  provisions  and conditions  of  such  Series  A
Debentures to be set forth as provided in the Indenture and  this
First Supplemental Indenture; and

           WHEREAS,  Illinois  Power Capital,  L.P.,  a  Delaware
limited  partnership ("Illinois Power Capital"), has  offered  to
the   public  its  9.45%  Cumulative  Monthly  Income   Preferred
Securities,  Series  A  (the  "Series A  Preferred  Securities"),
representing limited partner interests in Illinois Power  Capital
and  proposes  to invest the proceeds from such offering  in  the
Series A Debentures; and

           WHEREAS,  upon the occurrence of a Special  Event  (as
defined   in  the  Amended  and  Restated  Agreement  of  Limited
Partnership of Illinois Power Capital, dated September  29,  1994
(the  "Limited Partnership Agreement")), the Company may dissolve
Illinois Power Capital and cause to be distributed to the holders
of the Series A Preferred Securities, on a pro rata basis, Series
A Debentures (a "Dissolution Event"); and

           WHEREAS,  the  Company desires and has  requested  the
Trustee  to  join with it in the execution and delivery  of  this
First  Supplemental Indenture, and all requirements necessary  to
make  this  First Supplemental Indenture a valid  instrument,  in
accordance  with its terms, and to make the Series A  Debentures,
when  executed by the Company and authenticated and delivered  by
the  Trustee,  the  valid obligations of the Company,  have  been
performed and fulfilled, and the execution and delivery  of  this
First  Supplemental  Indenture have been  in  all  respects  duly
authorized:

           NOW  THEREFORE, in consideration of the  purchase  and
acceptance of the Series A Debentures by their holders,  and  for
the  purpose of setting forth, as provided in the Indenture,  the
form  and  substance of the Series A Debentures  and  the  terms,
provisions  and  conditions of them, the  Company  covenants  and
agrees with the Trustee as follows:

                          ARTICLE ONE

                General Terms and Conditions of
                    the Series A Debentures

           SECTION  1.01.   There shall be and  is  authorized  a
series   of   Debentures  designated  the   "9.45%   Subordinated
Debentures,  Series  A,  Due  September  30,  2043,"  limited  in
aggregate  principal  amount to (i)  $97,000,000  plus  (ii)  the
amount of capital contributions made by the Company from time  to
time  as general partner of Illinois Power Capital, which  amount
shall be as set forth in any written order of the Company for the
authentication and delivery of Series A Debentures.  The Series A
Debentures  shall  mature  and the principal  shall  be  due  and
payable  together with all accrued and unpaid interest  on  them,
including Additional Interest (as defined below) on September 30,
2043,  and  shall  be issued in the form of registered  Series  A
Debentures without coupons.

           SECTION 1.02.  Except as provided in Section 1.03, the
Series  A  Debentures  shall  be  issued  in  certificated  form.
Principal  of and interest on the Series A Debentures  issued  in
certificated form will be payable, the transfer of such Series  A
Debentures will be registrable and such Series A Debentures  will
be  exchangeable  for the Series A Debentures  bearing  identical
terms  and  provisions at the office or agency of the Company  in
Decatur,  Illinois; provided, however, that payment  of  interest
may  be made at the option of the Company by check mailed to  the
registered  holder  at  such  address  as  shall  appear  in  the
Debenture  Register.  Notwithstanding the foregoing, so  long  as
the  holder of the Series A Debentures is Illinois Power Capital,
the   payment  of  the  principal  of  and  interest   (including
Additional Interest, if any) on the Series A Debentures  will  be
made  at  such place and to such account as may be designated  by
Illinois Power Capital.

           SECTION 1.03.  In connection with a Dissolution Event,
the Series A Debentures in certificated form may be presented  to
the  Trustee by Illinois Power Capital in exchange for  a  Global
Debenture  in  an  aggregate  principal  amount  equal   to   all
Outstanding Series A Debentures, to be registered in the name  of
the  Depository, or its nominee, and delivered by the Trustee  to
the Depository for crediting to the accounts of its participants.
The  Company  upon any such presentation shall execute  a  Global
Debenture in such aggregate principal amount and deliver the same
to  the Trustee for authentication and delivery as provided above
and in the Indenture.  Payments on the Series A Debentures issued
as  a  Global  Debenture  will be made to  the  Depository.   The
Depository  for  the Series A Debentures shall be The  Depository
Trust Company, New York, New York.

           SECTION  1.04.   Each  Series A  Debenture  will  bear
interest at the rate of 9.45% per annum from the original date of
issuance  until the principal of such Series A Debenture  becomes
due  and payable, and on any overdue principal and (to the extent
that  payment  of  such interest is enforceable under  applicable
law) on any overdue installment of interest at the same rate  per
annum,  payable  monthly  in arrears on  the  last  day  of  each
calendar  month  of each year (each, an "Interest Payment  Date,"
with  the  first  such Interest Payment Date  being  October  31,
1994), to the person in whose name such Series A Debenture or any
predecessor  Series A Debenture is registered, at  the  close  of
business   on   the  regular  record  date  for   such   interest
installment, which shall be the close of business on the Business
Day  next  preceding that Interest Payment Date.  If pursuant  to
the  provisions of Section 2.11(c) of the Indenture the Series  A
Subordinated  Debentures are no longer represented  by  a  Global
Debenture, the Company may select a regular record date for  such
interest  installment  which shall be any  date  not  later  than
fifteen  days  preceding  an Interest  Payment  Date.   Any  such
interest (including Additional Interest) not punctually  paid  or
duly  provided for shall immediately cease to be payable  to  the
registered holders on such regular record date, and may  be  paid
to  the  person in whose name the Series A Debenture (or  one  or
more  Predecessor  Debentures) is  registered  at  the  close  of
business on a special record date to be fixed by the Trustee  for
the  payment of such defaulted interest, notice of which  special
record  date  shall  be given to the registered  holders  of  the
Series  A Debentures not less than 10 days prior to such  special
record  date,  or  may be paid at any time in  any  other  lawful
manner  not  inconsistent with the requirements of any securities
exchange on which the Series A Debentures may be listed, and upon
such  notice  as may be required by such exchange,  all  as  more
fully provided in the Indenture.


                          ARTICLE TWO

          Mandatory Prepayment and Optional Redemption
                   of the Series A Debentures

           SECTION  2.01.  If Illinois Power Capital redeems  the
Series A Preferred Securities in accordance with their terms, the
Series  A  Debentures will become due and payable in a  principal
amount  equal  to  the aggregate liquidation  preference  of  the
Series  A  Preferred Securities so redeemed,  together  with  all
accrued   and  unpaid  interest  on  them,  including  Additional
Interest, if any (the "Mandatory Prepayment Price").  Any payment
pursuant to this provision shall be made prior to 12:00 noon, New
York time, on the date of such redemption or at such earlier time
as the Company and Illinois Power Capital shall agree.

           SECTION  2.02.  The Company shall have  the  right  to
redeem the Series A Debentures, in whole or in part, from time to
time, on or after October 6, 1999, at a redemption price equal to
100% of the principal amount to be redeemed plus any accrued  and
unpaid  interest on them, including any Additional  Interest,  if
any,  to  the  date of such redemption (the "Optional  Redemption
Price").  Any redemption pursuant to this paragraph will be  made
upon  not  less  than 30 nor more than 60 days'  notice,  at  the
Optional  Redemption Price.  If the Series A Debentures are  only
partially redeemed pursuant to this Section, the Debentures  will
be redeemed pro rata or by lot or by any other method utilized by
the  Trustee;  provided, that if at the time of  redemption,  the
Series  A  Debentures are registered as a Global  Debenture,  the
Depository  shall determine by lot the principal amount  of  such
Series A Debentures held by each Series A Debentureholder  to  be
redeemed.


                         ARTICLE THREE

              Extension of Interest Payment Period

          SECTION 3.01.  So long as the Company is not in default
in  the  payment  of interest on any series of Debentures  issued
under  the  Indenture, the Company shall have the right,  at  any
time  during  the term of the Series A Debentures, from  time  to
time  to  extend  the interest payment period of  such  Series  A
Debentures  for  up  to  60  consecutive  months  (the  "Extended
Interest Payment Period"), at the end of which period the Company
shall  pay  all  interest accrued and unpaid  on  such  Series  A
Debentures  (together with interest on such  accrued  and  unpaid
interest at the rate specified for the Series A Debentures to the
extent  permitted by applicable law); provided that, during  such
Extended Interest Payment Period the Company shall not declare or
pay  any  dividend  on, or redeem, purchase, acquire  or  make  a
liquidation payment with respect to, any of its capital stock  or
make  any guarantee payments with respect to the foregoing (other
than  payments on the Guarantee); and provided further  that  any
such  extended interest payment period may only be selected  with
respect  to  the  Series  A Debentures if  an  extended  interest
payment period of identical length is simultaneously selected for
all  Debentures then Outstanding under the Indenture.   Prior  to
the termination of any such Extended Interest Payment Period, the
Company may further extend such period, provided that such period
together with all such further extensions of it shall not  exceed
60  consecutive  months.  Upon the termination  of  any  Extended
Interest  Payment Period and upon the payment of all accrued  and
unpaid interest and any Additional Interest then due, the Company
may select a new Extended Interest Payment Period, subject to the
foregoing  requirements.  No interest shall be  due  and  payable
during an Extended Interest Payment Period, except at the end  of
such Period.

           SECTION 3.02.  (a)  If Illinois Power Capital  is  the
sole  holder  of the Series A Debentures at the time the  Company
selects  an  Extended Interest Payment Period, the Company  shall
give  both Illinois Power Capital and the Trustee written  notice
of  its  selection of such Extended Interest Payment  Period  one
Business Day prior to the earlier of (i) the next succeeding date
on  which  dividends  on  the Series A Preferred  Securities  are
payable  or  (ii) the date Illinois Power Capital is required  to
give  notice  of the record date or the date such  dividends  are
payable to the New York Stock Exchange or other applicable  self-
regulatory  organization or to holders of the Series A  Preferred
Securities, but in any event not less than one Business Day prior
to  such  record  date.  The Company shall cause  Illinois  Power
Capital  to  give  notice  of  the Company's  selection  of  such
Extended  Interest Payment Period to the holders of the Series  A
Preferred Securities.

           (b)   If Illinois Power Capital is not the sole holder
of  the  Series A Debentures at the time the Company  selects  an
Extended  Interest  Payment Period, the Company  shall  give  the
holders of the Series A Debentures and the Trustee written notice
of  its  selection  of such Extended Interest Payment  Period  10
Business  Days  prior to the earlier of (i) the  next  succeeding
Interest Payment Date or (ii) the date the Company is required to
give  notice  of  the  record or payment date  of  such  interest
payment to the New York Stock Exchange or other applicable  self-
regulatory organization or to holders of the Series A Debentures,
but  in  any event not less than two Business Days prior to  such
record date.

          (c)  The month in which any notice is given pursuant to
paragraphs (a) or (b) of this Section shall constitute one of the
60  mouths  which comprise the maximum Extended Interest  Payment
Period.


                          ARTICLE FOUR

                        Right of Set-Off

          SECTION 4.01.  Notwithstanding anything to the contrary
in  the  Indenture or in this First Supplemental  Indenture,  the
Company  shall  have  the  right to set-off  any  payment  it  is
otherwise required to make under the Indenture or hereunder  with
and  to  the  extent  the  Company has  previously  made,  or  is
concurrently on the date of such payment making, a payment  under
the  Guarantee,  dated  as of October 1, 1994,  executed  by  the
Company  and furnished to Illinois Power Capital for the  benefit
of the holders of the Series A Preferred Securities.


                          ARTICLE FIVE

                  Covenant to List on Exchange

           SECTION  5.01.  If the Series A Debentures are  to  be
issued  as a Global Debenture in connection with the distribution
of  the  Series  A  Debentures to the holders  of  the  Series  A
Preferred  Securities upon a Dissolution Event, the Company  will
use  its  best  efforts to list such Debentures on the  New  York
Stock  Exchange  or  on  such other  exchange  as  the  Series  A
Preferred Securities are then listed and traded on the same  part
of any such exchange.


                          ARTICLE SIX

                   Form of Series A Debenture

            SECTION  6.01.   The  Series  A  Debentures  and  the
Trustee's  Certificate of Authentication to be endorsed  on  them
are to be substantially in the following forms:


                  (FORM OF FACE OF DEBENTURE)

          [If the Series A Debenture is to be a Global Indenture,
insert  _ This Debenture is a Global Debenture within the meaning
of  the Indenture referred to below and is registered in the name
of  a  Depository  or  a  nominee of  a  Depository.   Except  as
otherwise  provided  in  Section  2.11  of  the  Indenture,  this
Debenture may be transferred, in whole but not in part,  only  to
another nominee of the Depository or to a successor Depository or
to a nominee of such successor Depository.

           Unless  this  Debenture is presented by an  authorized
representative of The Depository Trust Company (55 Water  Street,
New  York)  to  the  issuer  or its  agent  for  registration  of
transfer,  exchange  or  payment, and  any  Debenture  issued  is
registered  in  the  name of Cede & Co. or  such  other  name  as
requested by an authorized representative of The Depository Trust
Company  and  any  payment hereon is made  to  Cede  &  Co.,  ANY
TRANSFER,  PLEDGE  OR OTHER USE OF THIS SERIES  A  DEBENTURE  FOR
VALUE  OR  OTHERWISE BY A PERSON IS WRONGFUL since the registered
owner  of this First Supplemental Indenture, Cede & Co.,  has  an
interest in this Debenture.]


No.                                              $_______________

CUSIP No.


ILLINOIS COMMERCE COMMISSION IDENTIFICATION NO. 5906


                     ILLINOIS POWER COMPANY


 9.45% SUBORDINATED DEBENTURE, SERIES A, DUE SEPTEMBER 30, 1994


           ILLINOIS  POWER COMPANY, a corporation duly  organized
and  existing  under  the  laws of the  State  of  Illinois  (the
"Company,"  which  term includes any successor corporation  under
the  Indenture), for value received, hereby promises  to  pay  to
_______________  or  registered assigns,  the  principal  sum  of
__________________________ Dollars on September 30, 2043, and  to
pay  interest on said principal sum from October 6, 1994 or  from
the  most  recent  interest  payment date  (each  such  date,  an
"Interest Payment Date") to which interest has been paid or  duly
provided for, monthly in arrears on the last day of each calendar
month  of each year, commencing October 31, 1994, at the rate  of
9.45%  per  annum  plus Additional Interest, if  any,  until  the
principal  of  this Debenture shall have become due and  payable,
and  on  any overdue principal and premium, if any, and  (to  the
extent  that  payment  of  such  interest  is  enforceable  under
applicable  law)  on any overdue installment of interest  at  the
same  rate  per  annum.  The amount of interest  payable  on  any
Interest Payment Date shall be computed on the basis of a 360-day
year  of  twelve 30-day months.  In the event that  any  date  on
which  interest  is payable on this Debenture is not  a  Business
Day,  then payment of interest payable on such date will be  made
on  the  next succeeding day which is a Business Day (and without
any  interest  or  other payment in respect of any  such  delay),
except  that,  if  such Business Day is in  the  next  succeeding
calendar  year,  such payment shall be made  on  the  immediately
preceding  Business  Day, in each case with the  same  force  and
effect  as  if  made on such date.  The interest  installment  so
payable,  and  punctually  paid or  duly  provided  for,  on  any
Interest Payment Date will, as provided in the Indenture, be paid
to  the  person  in whose name this Debenture  (or  one  or  more
Predecessor   Debentures,  as  defined  in  the   Indenture)   is
registered  at the close of business on the regular  record  date
for  such  interest installment[, which shall  be  the  close  of
business on the Business Day next preceding such Interest Payment
Date].  [If pursuant to the provisions of Section 2.11(c) of  the
Indenture the Series A Debentures are no longer represented by  a
Global  Debenture, the regular record date shall be the close  of
business  on  the ____ Business Day next preceding such  Interest
Payment Date.]  Any such interest installment not punctually paid
or duly provided for shall immediately cease to be payable to the
registered holders on such regular record date, and may  be  paid
to  the  person  in whose name this Debenture  (or  one  or  more
Predecessor Debentures) is registered at the close of business on
a  special record date to be fixed by the Trustee for the payment
of  such defaulted interest, notice of which special record  date
shall  be  given  to  the registered holders of  this  series  of
Debentures  not  less than 10 days prior to such  special  record
date,  or may be paid at any time in any other lawful manner  not
inconsistent with the requirements of any securities exchange  on
which  the Debentures may be listed, and upon such notice as  may
be  required by such exchange, all as more fully provided in  the
Indenture.   The  principal  of (and premium,  if  any)  and  the
interest  on  this Debenture shall be payable at  the  office  or
agency  of  the Company maintained for that purpose  in  Decatur,
Illinois, in any coin or currency of the United States of America
which  at  the  time of payment is legal tender  for  payment  of
public  and  private debts; provided, however,  that  payment  of
interest may be made at the option of the Company by check mailed
to  the registered holder at such address as shall appear in  the
Debenture  Register.  Notwithstanding the foregoing, so  long  as
the  holder  of  this Debenture is Illinois Power  Capital,  L.P.
("Illinois Power Capital"), the payment of the principal of  (and
premium, if any) and interest (including Additional Interest,  if
any)  on  this Debenture will be made at such place and  to  such
account as may be designated by Illinois Power Capital.

          The indebtedness evidenced by this Debenture is, to the
extent  provided  in the Indenture, subordinate  and  subject  in
right  of  payment  to the prior payment in full  of  all  Senior
Indebtedness,  and  this  Debenture  is  issued  subject  to  the
provisions   of   the   Indenture  with   respect   such   Senior
Indebtedness.   Each Holder of this Debenture, by  accepting  the
same,  (a)  agrees to and shall be bound by such provisions,  (b)
authorizes  and  directs the Trustee on such Holder's  behalf  to
take   such  action  as  may  be  necessary  or  appropriate   to
acknowledge or effectuate the subordination so provided  and  (c)
appoints the Trustee such Holder's attorney-in-fact for  any  and
all  such  purposes.   Each  Holder of this  Debenture,  by  such
Holder's acceptance of this Debenture, waives all notice  of  the
acceptance  of  the  subordination provisions contained  in  this
Debenture  and  in  the  Indenture  by  each  holder  of   Senior
Indebtedness, whether now outstanding or incurred after the  date
of  this Indenture, and waives reliance by each such Holder  upon
said provisions.

           This  Debenture shall not be entitled to  any  benefit
under  the  Indenture,  be  valid or become  obligatory  for  any
purpose until the Certificate of Authentication on this Debenture
shall have been signed by or on behalf of the Trustee.

           Unless  the  Certificate  of  Authentication  on  this
Debenture  has been executed by the Trustee referred  to  on  the
reverse  side  of  this Debenture, this Debenture  shall  not  be
entitled  to  any  benefit under the Indenture  or  be  valid  or
obligatory for any purpose.

           The provisions of this Debenture are contained on  the
reverse  side of  it and such continued provisions shall for  all
purposes have the same effect as though fully set forth  at  this
place.

           IN  WITNESS  WHEREOF,  the  Company  has  caused  this
Instrument to be executed.

Dated___________________

                              ILLINOIS POWER COMPANY

[SEAL]

                              By:
                                   Vice President

Attest:




          Secretary


            (FORM OF CERTIFICATE OF AUTHENTICATION)

                 CERTIFICATE OF AUTHENTICATION

           This  is  one  of  the Debentures  of  the  series  of
Debentures described in the within-mentioned Indenture.

The First National Bank of Chicago




     as Trustee                    or   as Authentication Agent



By                                 By
       Authorized   Signatory                          Authorized
Signatory



                 (FORM OF REVERSE OF DEBENTURE)

           This  Debenture is one of a duly authorized series  of
Debentures  of the Company (the "Debentures"), specified  in  the
Indenture, all issued or to be issued in one or more series under
and  pursuant to an Indenture dated as of October 1,  1994,  duly
executed and delivered between the Company and The First National
Bank  of  Chicago, a national banking association duly  organized
and  existing under the laws of the United States of America,  as
Trustee   (the   "Trustee"),  as  supplemented   by   the   First
Supplemental  Indenture dated as of October 1, 1994  between  the
Company and the Trustee (as so supplemented, the "Indenture"), to
which  Indenture and all indentures supplemental to it  reference
is  made  for a description of the rights, limitations of rights,
obligations, duties and immunities under it the Indenture of  the
Trustee, the Company and the holders of the Debentures.   By  the
terms  of  the Indenture, the Debentures are issuable  in  series
which  may vary as to amount, date of maturity, rate of  interest
and  in other respects as provided in the Indenture.  This series
of  Debentures  is  limited  in  aggregate  principal  amount  as
specified in said First Supplemental Indenture.

           If Illinois Power Capital redeems its 9.45% Cumulative
Monthly  Income  Preferred Securities, Series A  (the  "Series  A
Preferred  Securities")  in  accordance  with  their  terms,  the
Debentures  will  become due and payable in  a  principal  amount
equal  to  the  aggregate stated liquidation  preference  of  the
Series  A  Preferred Securities so redeemed,  together  with  any
interest  accrued  on  them, including Additional  Interest  (the
"Mandatory  Prepayment Price").  Any payment  of  such  Mandatory
Prepayment  Price  shall be made prior to 12:00  noon,  New  York
time,  on the date of such redemption or at such earlier time  as
the Company and Illinois Power Capital shall agree.  At such time
as   there   are  no  Series  A  Preferred  Securities  remaining
outstanding  and  subject to the terms of Article  Three  of  the
Indenture,  the  Company  shall have the  right  to  redeem  this
Debenture  at  the  option  of the Company,  without  premium  or
penalty,  in whole or in part at any time on or after October  6,
1999  (an "Optional Redemption"), at a redemption price equal  to
100%  of  the principal amount of this Debenture plus any accrued
but  unpaid interest, including any Additional Interest, if  any,
to the date of such redemption (the "Optional Redemption Price").
Any  redemption pursuant to this paragraph will be made upon  not
less  than  30  nor more than 60 days' notice,  at  the  Optional
Redemption Price.  If the Debentures are only partially  redeemed
by the Company pursuant to an Optional Redemption, the Debentures
will  be  redeemed  pro rata or by lot or  by  any  other  method
utilized  by  the  Trustee; provided  that  if  at  the  time  of
redemption, the Debentures are registered as a Global  Debenture,
the  Depository  shall determine by lot the principal  amount  of
such Debentures held by each Debentureholder to be redeemed.

           In  the event of redemption of this Debenture in  part
only,  a  new  Debenture or Debentures of  this  series  for  the
unredeemed portion of this Debenture will be issued in  the  name
of  the  Holder of this Debenture upon the cancellation  of  this
Debenture.

           In  case  an  Event  of Default,  as  defined  in  the
Indenture,  shall have occurred and be continuing, the  principal
of  all  of  the  Debentures  may  be  declared,  and  upon  such
declaration  shall become, due and payable, in the  manner,  with
the  effect  and  subject  to  the  conditions  provided  in  the
Indenture.

          The Indenture contains provisions for defeasance at any
time of the entire indebtedness of this Debenture upon compliance
by   the  Company  with  certain  conditions  set  forth  in  the
Indenture.

            The  Indenture  contains  provisions  permitting  the
Company and the Trustee, with the consent of the Holders  of  not
less  than  a  majority  in  aggregate principal  amount  of  the
Debentures  of  each series affected at the time outstanding,  as
defined in the Indenture, to execute supplemental indentures  for
the purpose of adding any provisions to or changing in any manner
or  eliminating any of the provisions of the Indenture or of  any
supplemental indenture or of modifying in any manner  the  rights
of the Holders of the Debentures; provided, however, that no such
supplemental indenture shall (i) extend the fixed maturity of any
Debentures of any series, or reduce the principal amount of them,
or  reduce the rate or extend the time of payment of interest  on
them,  or reduce any premium payable upon the redemption of them,
without  the consent of the holder of each Debenture so  affected
or  (ii)  reduce  the  aforesaid percentage  of  Debentures,  the
holders of which are required to consent to any such supplemental
indenture,  without the consent of the holders of each  Debenture
then  outstanding and affected by such reduction.  The  Indenture
also contains provisions permitting the Holders of a majority  in
aggregate principal amount of the Debentures of all series at the
time  outstanding affected thereby, on behalf of the  Holders  of
the  Debentures of such series, to waive any past default in  the
performance  of any of the covenants contained in the  Indenture,
or  established  pursuant to the Indenture with respect  to  such
series, and its consequences, except a default in the payment  of
the  principal of or premium, if any, or interest on any  of  the
Debentures  of  such series.  Any such consent or waiver  by  the
registered  Holder of this Debenture (unless revoked as  provided
in  the  Indenture)  shall be conclusive and  binding  upon  such
Holder  and upon all future Holders and owners of this  Debenture
and  of any Debenture issued in exchange for or in place of  this
Debenture  (whether  by registration of transfer  or  otherwise),
irrespective  of whether or not any notation of such  consent  or
waiver is made upon this Debenture.

           No reference in this Debenture to the Indenture and no
provision  of this Debenture or of the Indenture shall  alter  or
impair  the  obligation  of the Company, which  is  absolute  and
unconditional, to pay the principal of and premium, if  any,  and
interest on this Debenture at the time and place and at the  rate
and in the money prescribed in this Debenture.

          The Company shall have the right at any time during the
term  of the Debentures, from time to time to extend the interest
payment period of such Debentures to up to 60 consecutive  months
(the  "Extended Interest Payment Period"), at the  end  of  which
period the Company shall pay all interest then accrued and unpaid
(together  with interest on such accrued and unpaid  interest  at
the  rate specified for the Debentures to the extent that payment
of  such  interest is enforceable under applicable law); provided
that,  during such Extended Interest Payment Period  the  Company
shall  not  declare or pay any dividend on, or redeem,  purchase,
acquire or make a liquidation payment with respect to, any of its
capital stock or make any guarantee payments with respect to  the
foregoing  (other than payments on the Guarantee);  and  provided
further  that any such extended interest payment period may  only
be  selected  with  respect  to the Series  A  Debentures  if  an
extended   interest  payment  period  of  identical   length   is
simultaneously selected for all Debentures then outstanding under
the  Indenture.   Prior to the termination of any  such  Extended
Interest  Payment  Period, the Company may  further  extend  such
Extended  Interest  Payment  Period, provided  that  such  Period
together with all such further extensions of it shall not  exceed
60  consecutive months.  At the termination of any such  Extended
Interest  Payment Period and upon the payment of all accrued  and
unpaid  interest and any additional amounts then due, the Company
may select a new Extended Interest Payment Period.

           As  provided in the Indenture and subject  to  certain
limitations  set  forth in it, this Debenture is transferable  by
the registered holder of this Debenture on the Debenture Register
of the Company, upon surrender of this Debenture for registration
of  transfer  at the office or agency of the Company in  Decatur,
Illinois  accompanied by a written instrument or  instruments  of
transfer in form satisfactory to the Company or the Trustee  duly
executed  by  the  registered holder of this  Debenture  or  such
holder's attorney duly authorized in writing, upon which  one  or
more  new Debentures of authorized denominations and for the same
aggregate  principal  amount and series will  be  issued  to  the
designated transferee or transferees.  No service charge will  be
made  for any such transfer, but the Company may require  payment
of a sum sufficient to cover any tax or other governmental charge
payable in relation to such transfer.

           Prior  to due presentment for registration of transfer
of this Debenture, the Company, the Trustee, any paying agent and
any  Debenture Registrar may deem and treat the registered holder
of  this  Debenture  as  the absolute  owner  of  this  Debenture
(whether   or   not   this  Debenture  shall   be   overdue   and
notwithstanding  any  notice  of ownership  or  writing  on  this
Debenture made by anyone other than the Debenture Registrar)  for
the  purpose  of  receiving payment  of  or  on  account  of  the
principal of this Debenture and premium, if any, and interest due
on  this  Debenture and for all other purposes, and  neither  the
Company  nor  the Trustee nor any paying agent nor any  Debenture
Registrar shall be affected by any notice to the contrary.

           No  recourse  shall  be had for  the  payment  of  the
principal of or the interest on this Debenture, or for any  claim
based  on  this  Debenture,  or  otherwise  in  respect  of  this
Debenture,  or  based on or in respect of the Indenture,  against
any incorporator, stockholder, officer or director, past, present
or  future,  as  such, of the Company or of  any  predecessor  or
successor  corporation, whether by virtue  of  any  constitution,
statute  or  rule of law, or by the enforcement of any assessment
or  penalty  or  otherwise,  all such  liability  being,  by  the
acceptance of this Debenture and as part of the consideration for
the issuance of this Debenture, expressly waived and released.

           The  Debentures  of this series are issuable  only  in
registered form without coupons in denominations of $25  and  any
integral  multiple of $25.  This Global Debenture is exchangeable
for  Debentures  in  definitive form only under  certain  limited
circumstances  set  forth in the Indenture.  Debentures  of  this
series  so  issued are issuable only in registered  form  without
coupons in denominations of $25 and any integral multiple of $25.
As  provided  in the Indenture and subject to certain limitations
set forth in this Debenture and the Indenture, Debentures of this
series  so issued are exchangeable for a like aggregate principal
amount  of  Debentures  of this series of a different  authorized
denomination, as requested by the Holder surrendering the same.

           All terms used in this Debenture which are defined  in
the  Indenture shall have the meanings assigned to  them  in  the
Indenture.


                         ARTICLE SEVEN

             Original Issue of Series A Debentures

           SECTION  7.01.  Series A Debentures in  the  aggregate
principal  amount  of  $97,000,000 plus  the  amount  of  capital
contributions  made by the Company from time to time  as  general
partner  of Illinois Power Capital, may, upon execution  of  this
First Supplemental Indenture, or from time to time thereafter, be
executed  by  the  Company  and  delivered  to  the  Trustee  for
authentication,  and the Trustee shall upon  such  execution  and
delivery authenticate and deliver said Debentures to or upon  the
written order of the Company, signed by its Chairman or any  Vice
President  and  its Treasurer or an Assistant Treasurer,  without
any further action by the Company.


                         ARTICLE EIGHT

                Special Covenants of the Company

           SECTION  8.01.   So long as any Debentures  issued  in
connection with the application of the proceeds from the issuance
and  sale  of  a  series of Series A Preferred Securities  remain
outstanding, the Company will (i) remain the sole general partner
of  Illinois  Power  Capital and maintain 100%-ownership  of  the
general  partner  interests of Illinois Power  Capital;  provided
that  any  permitted successor of the Company under the Indenture
may  succeed  to  its duties as general partner, (ii)  contribute
capital  to  the extent required to maintain its  capital  at  an
amount equal to at least 3% of the total capital contributions to
Illinois  Power Capital, (iii) not voluntarily dissolve,  wind-up
or terminate Illinois Power Capital, except in connection with  a
distribution  of  Debentures  and  in  connection  with   certain
mergers, consolidations or amalgamations permitted by the Limited
Partnership Agreement, (iv) timely perform all of its  duties  as
General  Partner  (including the duty to  pay  dividends  on  the
Preferred Securities of Illinois Power Capital) and (v)  use  its
reasonable  efforts to cause Illinois Power Capital to  remain  a
limited  partnership except in connection with a distribution  of
Debentures and in connection with certain mergers, consolidations
or  amalgamations permitted by the Limited Partnership Agreement,
and  otherwise continue to be treated as a partnership for United
States  federal income tax purposes except in connection  with  a
distribution of Debentures.


                          ARTICLE NINE

                       Sundry Provisions

           SECTION  9.01.  Except as otherwise expressly provided
in  this First Supplemental Indenture or in the form of Series  A
Debenture  or otherwise clearly required by the context  of  this
First  Supplemental Indenture or the form of Series A  Debenture,
all  terms used in this First Supplemental Indenture or  in  said
form  of  Series  A Debenture that are defined in  the  Indenture
shall have the several meanings respectively assigned to them  by
the Indenture.

           SECTION 9.02.  The Indenture, as supplemented by  this
First  Supplemental  Indenture, is in all respects  ratified  and
confirmed, and this First Supplemental Indenture shall be  deemed
part of the Indenture in the manner and to the extent provided in
this First Supplemental Indenture or in the Indenture.

           SECTION  9.03.  The recitals contained in  this  First
Supplemental  Indenture are made by the Company and  not  by  the
Trustee,  and  the  Trustee  assumes no  responsibility  for  the
correctness of them.  The Trustee makes no representation  as  to
the validity or sufficiency of this First Supplemental Indenture.

          SECTION 9.04.  This First Supplemental Indenture may be
executed in any number of counterparts each of which shall be  an
original; but such counterparts shall together constitute but one
and the same instrument.

          IN WITNESS WHEREOF, the parties hereto have caused this
First  Supplemental  Indenture to be  duly  executed,  and  their
respective  corporate  seals  to  be  affixed  unto  this   First
Supplemental  Indenture  and  attested,  on  the  date  or  dates
indicated in the acknowledgments and as of the day and year first
above written.

                              ILLINOIS POWER COMPANY



                              By:  /s/Larry S. Brodsky
                                 -----------------------------
                                   Vice President

Attest:


/s/Gary B. Pasek
- -----------------------
Assistant Secretary


                              THE FIRST NATIONAL BANK OF CHICAGO
                                as Trustee



                              By: /s/Steven M. Wagner
                                 -----------------------------
                                   Title: Vice President
                                         ---------------------
Attest:



/s/L. B. Jenkins
- ------------------------
Title: Trust Officer
      ------------------
STATE OF ILLINOIS   )
                    )    ss.: October   2, 1994
COUNTY OF MACON     )         -------- ---

           On  the  2nd day of October, in the year one  thousand
nine  hundred ninety-four, before me personally came L.S. Brodsky
and  Gary B. Pasek to me known, who, being by me duly sworn,  did
depose  and  say that they are the Vice President  and  Assistant
Secretary,  respectively, of ILLINOIS POWER COMPANY, one  of  the
corporations   described  in  and  which   executed   the   above
instrument;   that  they  know  the  corporate   seal   of   said
corporation; that the seal affixed to the said instrument is such
corporation  seal;  that it was so affixed by  authority  of  the
Board  of  Directors of said corporation, and  that  they  signed
their respective names thereto by like authority.


                         /s/Richard G. Boersma
                         ----------------------------------
                                                  NOTARY PUBLIC


                         My Commission Expires December 20, 1994


STATE OF ILLINOIS   )
                    )    ss.:  October      2, 1994
COUNTY OF COOK      )

           On  the  4th day of October, in the year one  thousand
nine  hundred  ninety-four, before me personally came  Steven  M.
Wagner  and  L.  B. Jenkins to me known, who, being  by  me  duly
sworn,  did  depose and say that they are the Vice President  and
Trust  Officer,  respectively, of  THE  FIRST  NATIONAL  BANK  OF
CHICAGO,  one of the corporations described in and which executed
the  above instrument; that they know the corporate seal of  said
corporation;  that  the seal affixed to said instrument  is  such
corporate seal; that it was so affixed by authority of the  Board
of  Directors  of  said corporation and that  they  signed  their
respective names to the instrument by like authority.



                              /s/ Ann Longino
                              -----------------------------------
                              NOTARY PUBLIC

                              My Commission Expires May 17, 1998