UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                                
                     Washington, DC   20549
                                
                            FORM 8-K
                                
                         CURRENT REPORT
                                
             Pursuant to Section 13 or 15(d) of the
                 Securities Exchange Act of 1934
                                

Date of Report (Date of earliest event reported) December 3, 1998


                          CILCORP Inc.
     (Exact name of registrant as specified in its charter)
                                
   Illinois                     1-8946              37-1169387
(State or other              (Commission          (IRS Employer
jurisdiction of                File Number)    Identification No.)
incorporation)

      300 Hamilton Blvd., Suite 300, Peoria, Illinois 61602
            (Address of principal executive offices)

Registrant's telephone number, including area code (309) 675-8810


                                
Item 5.  Other Events

Acquisition of CILCORP Inc. by The AES Corporation

On November 22, 1998, CILCORP Inc., an Illinois corporation (the
"Company"), entered into an Agreement and Plan of Merger (the
"Merger Agreement") with The AES Corporation, a Delaware
corporation ("AES") and Midwest Energy, Inc., an Illinois
corporation and wholly owned subsidiary of AES ("Midwest"),
pursuant to which Midwest will be merged with and into the
Company, with the Company as the surviving corporation (the
"Merger").  Thereafter, at the discretion of AES, the Company may
be merged with and into AES with AES as the surviving corporation
(the "Second Merger"). As a result of the Merger, each
outstanding share of the Company's common stock, no par value
("Company Common Stock"), will be converted into the right to
receive $65 in cash.  In addition, if the Company has satisfied
all other conditions to consummation of the Merger and AES has not
received an order from the Securities and Exchange Commission
("SEC Order") granting an exemption from registration under the
Public Utility Holding Company Act of 1935 (the "PUHCA") within 9
months from the date of the Merger Agreement (unless AES waives such
condition), then the per share consideration will be increased to $66
per share, and will increase by $0.00546448 per day for each day following
the 9 month anniversary of the Merger Agreement until the SEC Order has been
obtained or waived by AES.
If after 9 months, the SEC Order has not been obtained or
waived, but the Company has not yet satisfied all other closing conditions,
no pricing adjustment will occur if AES obtains or waives the SEC Order
before the Company satisfies its closing conditions.  If,
however, the Company satisfies its closing conditions first, but
after 9 months from the date of the Merger Agreement, then the
pricing adjustment to $66 per share along with the per day increase will
come into effect at such time as the conditions are satisified. In no event
will the price per share exceed $68.

The Merger is conditioned upon, among other things, approval by
the shareholders of the Company, the completion of regulatory
procedures at the Illinois Commerce Commission and the Federal
Energy Regulatory Commission and AES obtaining financing for the
transaction.

In the event that the transaction has not been consummated within
18 months (or later if all conditions other than financing are satisified
after the 15 month anniversary of the Merger Agreement) 
from the date of the Merger Agreement,
either side may terminate the Merger Agreement without any
termination fee. The Merger Agreement may also be terminated
without a termination fee if CILCORP is unable to obtain certain
approvals from the Illinois Commerce Commission within one year
from the date of the Merger Agreement.  If AES is unable to
obtain financing within 90 days following the date that all other conditions
under the agreement have been satisfied or waived,
either party may terminate the agreement, and AES will pay to the
Company a termination fee equal to $5.00 per outstanding share of
Company Common Stock.  If AES has not obtained its
PUHCA exemption within 18 months following the date of the Merger
Agreement and the Company has otherwise complied with all of its
obligations under the Merger Agreement, the Company may terminate
the Merger Agreement and receive a termination fee from AES equal
to $1 per outstanding share of Company Common Stock, plus
$0.00546448 per share for each day beginning on the later of the
day after the 9 month anniversary of the Merger Agreement and
five days after the date upon which the Company has obtained
certain orders or approvals from the Illinois Commerce
Commission. The Company may also terminate the Merger Agreement
if, at any time prior to the shareholder's approval of the
transaction, the Company receives an unsolicited offer from a
third party which the Company's board of directors believes in
good faith to be superior to the terms of the Merger Agreement
and for which the failure to agree to that superior offer could
constitute a breach of the board's fiduciary duties under applicable law.
However, if the Company does terminate the Merger Agreement under those
circumstances, the Company must pay AES a termination fee equal
to 3.0% of the aggregate consideration of the Merger.
Correspondingly, if the Company's shareholders do not approve the
transaction and the Company enters into any agreement for an
alternative transaction within 12 months following the date of
the shareholders meeting, then the Company is similarly obligated
to pay AES an amount equal to 3.0% of the aggregate consideration
of the Merger.

Attached (as Exhibit A) is a copy of the Agreement and Plan of
Merger among The AES Corporation, CILCORP Inc., and Midwest
Energy, Inc. dated as of November 22, 1998, under which The AES
Corporation will acquire all of the common shares of CILCORP
Inc., as well as a press release (Exhibit B) issued by CILCORP
Inc. on November 23, 1998, related to this Agreement.


                           SIGNATURES

Pursuant to the requirements of the Securities Act of 1934, the
registrant has duly caused this report to be signed on its behalf
by the undersigned thereunto duly authorized.




                                                  CILCORP Inc.
                                                  (Registrant)
                                                  

Date December 3, 1998                            R. O. Viets
                                                 R. O. Viets
                                    President and Chief Executive Officer



Date December 3, 1998                          T. D. Hutchinson
                                               T. D. Hutchinson
                                                  Controller
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
  
                                                   (Exhibit A)
  
  
  
  
  
                  AGREEMENT AND PLAN OF MERGER
  
                              among
  
                      THE AES CORPORATION,
  
                          CILCORP INC.,
  
                               and
  
                      MIDWEST ENERGY, INC.
  
  
  
  
  
                   __________________________
  
                  Dated as of November 22, 1998
  
                   __________________________
  
  
                  AGREEMENT AND PLAN OF MERGER
  
  
           AGREEMENT AND PLAN OF MERGER, dated as of November
  22, 1998 (this "Agreement"), among The AES Corporation, a
  Delaware corporation ("AES"), CILCORP Inc., an Illinois
  corporation ("CILCORP"), and Midwest Energy, Inc., an Illinois
  corporation and wholly-owned subsidiary of AES ("Merger Sub").
  
                      W I T N E S S E T H :
  
           WHEREAS, the respective Boards of Directors of AES
  and CILCORP each have determined that the acquisition of
  CILCORP by AES is in the best interests of their respective
  stockholders; and
  
           WHEREAS, in furtherance thereof, the respective
  Boards of Directors of AES, CILCORP and Merger Sub have
  approved the merger of Merger Sub with and into CILCORP,
  pursuant to the terms and subject to the conditions set forth
  in this Agreement (the "Merger"); and
  
           WHEREAS, the Board of Directors of AES has determined
  that it may be desirable for AES to merge CILCORP with and
  into AES following but substantially contemporaneously with
  the Merger (the "Second Merger" which, for purposes of this
  Agreement, if it occurs, shall be deemed to occur immediately
  after the Merger).
  
           NOW, THEREFORE, in consideration of the premises and
  the representations, warranties, covenants and agreements
  contained herein, the parties hereto, intending to be legally
  bound hereby, agree as follows:
  
  
                            ARTICLE I
  
                           THE MERGER
  
           Section 1.1    The Merger.  At the Effective Time (as
  defined in Section 1.2 hereof) and upon the terms and subject
  to the conditions of this Agreement and the Illinois Business
  Corporation Act (the "Illinois Act"), Merger Sub shall be
  merged with and into CILCORP, the separate corporate existence
  of Merger Sub shall cease, and CILCORP shall continue as the
  surviving corporation (sometimes hereinafter referred to as
  the "Surviving Corporation").
  
           Section 1.2    Effective Time.  On the Closing Date
  (as defined in Section 3.1 hereof), Articles of Merger
  complying with the requirements of the Illinois Act shall be
  executed and filed by CILCORP and Merger Sub with the
  Secretary of State of the State of Illinois. The Merger shall
  become effective on the date on which the Certificate of
  Merger is issued by the Secretary of State of the State of
  Illinois (the "Effective Time").
  
           Section 1.3    Effect of the Merger.  At the
  Effective Time, the effect of the Merger shall be as provided
  in the applicable provisions of the Illinois Act.  Without
  limiting the generality of the foregoing, and subject thereto,
  at the Effective Time all the property, rights, privileges,
  powers and franchises of CILCORP and Merger Sub shall vest in
  the Surviving Corporation, and all debts, liabilities and
  duties of CILCORP and Merger Sub shall become the debts,
  liabilities and duties of the Surviving Corporation.
  
           Section 1.4    Subsequent Actions.  If, at any time
  after the Effective Time, the Surviving Corporation shall
  consider or be advised that any deeds, bills of sale,
  assignments, assurances or any other actions or things are
  necessary or desirable to vest, perfect or confirm of record
  or otherwise in the Surviving Corporation its right, title or
  interest in, to or under any of the rights, properties or
  assets of either of CILCORP or Merger Sub acquired or to be
  acquired by the Surviving Corporation as a result of, or in
  connection with, the Merger or otherwise to carry out this
  Agreement, the officers and directors of the Surviving
  Corporation shall be authorized to execute and deliver, in the
  name and on behalf of either CILCORP or Merger Sub, all such
  deeds, bills of sale, assignments and assurances and to take
  and do, in the name and on behalf of each of such corporations
  or otherwise, all such other actions and things as may be
  necessary or desirable to vest, perfect or confirm any and all
  right, title and interest in, to and under such rights,
  properties or assets in the Surviving Corporation or otherwise
  to carry out this Agreement.
  
           Section 1.5    Articles of Incorporation; By-Laws;
  Directors; Officers.
  Unless otherwise determined by AES prior to the Effective
  Time, at the Effective Time:
  
                (a)  The Articles of Merger shall provide that
  the Articles of Incorporation of Merger Sub, as in effect
  immediately prior to the Effective Time, shall be the Articles
  of Incorporation of the Surviving Corporation until thereafter
  amended as provided by law and such Articles of Incorporation.
  
                (b)  The By-Laws of Merger Sub, as in effect
  immediately prior to the Effective Time, shall be the By-Laws
  of the Surviving Corporation until thereafter amended as
  provided by law, the Articles of Incorporation of the
  Surviving Corporation and such By-Laws.
  
                (c)  The members of the Board of Directors of
  Merger Sub immediately prior to the Effective Time shall be
  the members of the Board of Directors of the Surviving
  Corporation, to hold office from the Effective Time until
  their respective successors are duly elected or appointed and
  shall have qualified in the manner provided in the Articles of
  Incorporation and By-Laws of the Surviving Corporation or as
  otherwise provided by law.
  
                (d)  The officers of CILCORP in office
  immediately prior to the Effective Time shall be the officers
  of the Surviving Corporation, to hold office from the
  Effective Time until their respective successors are duly
  elected or appointed and shall be qualified in the manner
  provided in the Articles of Incorporation and By-Laws of the
  Surviving Corporation or as otherwise provided by law.
  
  
                           ARTICLE II
  
                       TREATMENT OF SHARES
  
           Section 2.1    Conversion of Securities.  At the
  Effective Time, by virtue of the Merger and without any action
  on the part of Merger Sub, CILCORP or the holder of any of the
  following securities:
  
                (a)  Each share of common stock, no par value,
  of CILCORP (a "Share"), together with the associated purchase
  rights ("CILCORP Rights") under the CILCORP Rights Agreement
  (as defined in Section 4.18 hereof), issued and outstanding
  immediately prior to the Effective Time (other than any Shares
  to be canceled pursuant to Section 2.1(b) hereof and any
  Dissenting Shares (as defined in Section 2.3(a) hereof) shall
  be canceled and extinguished and be converted into the right
  to receive $65.00, subject to adjustment in accordance with
  Section 2.2 hereof (the "Per Share Amount"), in cash payable
  to the holder thereof, without interest, upon surrender of the
  certificate representing such Share in accordance with Section
  2.4 hereof.  Throughout this Agreement, the term "Shares"
  refers to the Shares together with the associated CILCORP
  Rights and the term "Aggregate Consideration Amount" shall
  mean an amount equal to the product of (x) the Per Share
  Amount as adjusted in accordance with Section 2.2 hereof and
  (y) the number of Shares outstanding on the Closing Date.
  
                (b)  Each Share held in the treasury of CILCORP
  and each Share owned by AES or any direct or indirect
  Subsidiary (as defined in Section 4.1 hereof) of AES or of
  CILCORP immediately prior to the Effective Time shall be
  canceled and extinguished, and no consideration shall be paid
  with respect thereto.
  
                (c)  Each share of common stock, no par value,
  of Merger Sub issued and outstanding immediately prior to the
  Effective Time shall thereafter be converted into and become
  one validly issued, fully paid and nonassessable share of
  common stock, no par value, of the Surviving Corporation.
  
           Section 2.2    Per Share Amount Adjustments.  Subject
  to AES' right of termination set forth in Section 9.1(c)(ii)
  hereof, in the event the SEC Exemption Order (as defined in
  Section 8.3(e) hereof) is issued by the Securities and
  Exchange Commission (the "SEC") after the date which is the
  nine-month anniversary of the date hereof, and provided that
  CILCORP shall have delivered to AES the CILCORP Certificate
  pursuant to Section 6.2(d) hereof, then the Per Share Amount
  shall be increased to $66.00 on the later to occur of (i) the
  day following the nine-month anniversary of the date hereof
  and (ii) the day after the date on which CILCORP delivers to
  AES the CILCORP Certificate.  Throughout this Agreement, the
  date on which the Per Share Amount is increased to $66.00
  pursuant to this Section 2.2 is referred to as the "First
  Adjustment Period." If the CILCORP Certificate is delivered
  after the nine-month anniversary but prior to the SEC
  Exemption Order being issued, then, following the First
  Adjustment Period, the Per Share Amount shall be increased
  from $66.00 by $0.00546448 per day for each day until the SEC
  Exemption Order is issued up to a maximum Per Share Amount of
  $68.00.  Notwithstanding the above, in no event shall the Per
  Share Amount be increased for any period after which AES has
  irrevocably waived the condition set forth in Section
  9.1(c)(ii) hereof.
  
           Section 2.3    Dissenting Shares.
  
                (a)  Notwithstanding anything to the contrary
  contained in this Agreement, to the extent appraisal rights
  are available to CILCORP stockholders pursuant to the Illinois
  Act, any Shares held by a person who objects to the Merger,
  whose Shares either were not entitled to vote or were not
  voted in favor of the Merger and who complies with all of the
  provisions of the Illinois Act concerning the rights of such
  person to dissent from the Merger and to require appraisal of
  such person's Shares and who has not withdrawn such objection
  or waived such rights prior to the Closing Date (as defined in
  Section 3.1 hereof) ("Dissenting Shares") shall not be
  converted into or represent a right to receive cash pursuant
  to Section 2.1 hereof, but shall become the right to receive
  such consideration as may be determined to be due to the
  holder of such Dissenting Shares pursuant to the Illinois Act.
  
                (b)  Notwithstanding the provisions of
  subsection (a) of this Section, each Dissenting Share held by
  a person at the Effective Time who shall, after the Effective
  Time, withdraw the demand for appraisal or lose the right of
  appraisal, in either case pursuant to the Illinois Act, shall
  be deemed to be converted, as of the Effective Time, into the
  right to receive cash as provided in Section 2.1(a) hereof,
  without interest thereon, upon surrender of the certificate or
  certificates representing such Shares in accordance with
  Section 2.4 hereof.
  
                (c)  CILCORP shall give AES (i) prompt notice of
  any written demands for appraisal or payment of the fair value
  of any Shares, withdrawals of such demands, and any other
  instruments served pursuant to the Illinois Act received by
  CILCORP in respect of demands for appraisal or payment of the
  fair value of any Shares and (ii) the opportunity to direct
  all negotiations and proceedings with respect to demands for
  appraisal under the Illinois Act.  CILCORP shall not
  voluntarily make any payment with respect to any demands for
  appraisal and shall not, except with the prior written consent
  of AES, settle or offer to settle any such demands.
  
           Section 2.4    Surrender of Shares; Stock Transfer
  Books.
  
                (a)  Prior to the Effective Time, CILCORP shall
  designate a bank or trust company to act as paying agent (the
  "Paying Agent") for purposes of paying the amounts
  contemplated by Section 2.1 hereof.  At the Effective Time,
  AES shall deposit, or cause to be deposited, with the Paying
  Agent for the benefit of holders of Shares, the aggregate
  consideration to which such holders shall be entitled when and
  as required pursuant to Section 2.1 hereof.
  
                (b)  As soon as practicable after the Effective
  Time, AES shall cause the Paying Agent to mail to each holder
  of record as of the Effective Time of a certificate or
  certificates that have been converted pursuant to Section 2.1
  hereof:  (i) a letter of transmittal (which shall specify that
  delivery shall be effected, and risk of loss and title to the
  certificates shall pass, only upon actual delivery of the
  certificates to the Paying Agent) and (ii) instructions for
  effecting the surrender of the certificates and receiving the
  aggregate consideration to which such holder shall be entitled
  therefor pursuant to Section 2.1 hereof.  Upon surrender of a
  certificate to the Paying Agent for cancellation, together
  with a duly executed letter of transmittal and such other
  documents as the Paying Agent may reasonably require, the
  holder of such certificate shall be entitled to receive in
  exchange therefor cash in an amount equal to the Per Share
  Amount multiplied by the number of Shares represented by such
  certificate.  Until so surrendered, each such certificate
  (other than certificates representing Dissenting Shares and
  certificates representing Shares canceled pursuant to Section
  2.1(b) hereof) shall be deemed at any time after the Effective
  Time to represent solely the right to receive upon such
  surrender the aggregate Per Share Amount relating thereto.  No
  interest shall accrue or be paid on any cash payable upon the
  surrender of a certificate or certificates which immediately
  prior to the Effective Time represented outstanding Shares.
  
                (c)  If payment of cash in respect of canceled
  Shares is to be made to a person other than the person in
  whose name a surrendered certificate or instrument is
  registered in the transfer records of CILCORP, it shall be a
  condition to such payment that the certificate or instrument
  so surrendered shall be properly endorsed or shall be other
  wise in proper form for transfer and shall be accompanied by
  evidence satisfactory to the Paying Agent that any transfer or
  other Taxes (as defined in Section 4.9 hereof) required by
  reason of such payment in a name other than that of the
  registered holder of the certificate or instrument either has
  been paid or is not payable.
  
                (d)  At the Effective Time, the stock transfer
  books of CILCORP shall be closed and there shall not be any
  further registration of transfer of any shares of capital
  stock thereafter on the records of CILCORP.  If, after the
  Effective Time, certificates for Shares are presented to the
  Surviving Corporation or AES, they shall be canceled and
  exchanged for cash as provided in Section 2.1(a) hereof and in
  this Section 2.4.
  
                (e)  Promptly following the date which is six
  months after the Effective Time, the Paying Agent shall
  deliver to AES all cash (including any interest received with
  respect thereto), certificates and other documents in its
  possession relating to the transactions contemplated hereby,
  and the Paying Agent's duties shall terminate.  Thereafter,
  each holder of a certificate representing Shares (other than
  certificates representing Dissenting Shares and certificates
  representing Shares canceled pursuant to Section 2.1(b)
  hereof) shall be entitled to look to the Surviving Corporation
  (subject to applicable abandoned property, escheat and similar
  laws) only as general creditors thereof with respect to the
  aggregate Per Share Amount payable upon due surrender of their
  certificates, without any interest or dividends thereon.
  Notwithstanding the foregoing, neither AES, the Surviving
  Corporation nor the Paying Agent shall be liable to any holder
  of a certificate representing Shares for the Per Share Amount
  delivered to a public official pursuant to any applicable
  abandoned property, escheat or similar law.
  
                (f)  The Per Share Amount paid in the Merger
  shall be net to the holder of Shares in cash, subject to
  reduction only for (i) such amounts as AES or the Paying Agent
  are required to withhold or deduct under the Code (as defined
  in Section 4.9(e) of this Agreement) or any provision of
  state, local or foreign Tax law with respect to the making of
  such payment, and (ii) as set forth in Section 2.4(c) hereof,
  any stock transfer or other Taxes payable by reason of such
  payment being made in a name other than that of the registered
  holder of the certificate or instrument.
  
           Section 2.5    CILCORP Options.  Two business days
  prior to the Closing Date, the CILCORP Shareholder Return
  Incentive Compensation Plan (the "CILCORP Option Plan") shall
  be amended (which such amendment shall be conditioned on the
  Closing occurring) to provide (i) as to all performance shares
  that have been granted under the CILCORP Option Plan and that
  have not been exercised prior to the date of such amendment
  (the "Performance Shares"),  that such Performance Shares
  shall be cancelled as of the Closing Date and (ii) at the
  Closing CILCORP shall pay to each holder of Performance Shares
  a cash payment equal to the number of Performance Shares held
  immediately prior to such amendment multiplied by the excess
  of the Per Share Amount over $36.00 less the amount of all
  applicable federal, state and local withholding Taxes in
  connection with such payment.  CILCORP shall take all actions
  necessary to ensure that such payment extinguishes all rights
  of such participants under the CILCORP Option Plan to receive
  either Shares or shares of common stock of AES at or after the
  Effective Time.
  
  
                           ARTICLE III
  
                           THE CLOSING
  
           Section 3.1    Closing.  The closing of the Merger
  (the "Closing") shall take place at the offices of Skadden,
  Arps, Slate, Meagher & Flom LLP, 919 Third Avenue, New York,
  New York 10022-3897 at 10:00 A.M., New York time, on the
  second business day immediately following the date on which
  the last of the conditions set forth in Article VIII hereof is
  fulfilled or waived, or at such other time, date and place as
  AES and CILCORP shall mutually agree (the "Closing Date").
  
  
                           ARTICLE IV
  
            REPRESENTATIONS AND WARRANTIES OF CILCORP
  
       CILCORP hereby represents and warrants to AES and Merger
  Sub as follows:
  
           Section 4.1    Organization and Qualification.
  CILCORP and each of the CILCORP Subsidiaries (as defined
  below) and, to the knowledge of CILCORP, each of the CILCORP
  Joint Ventures (as defined below) is a corporation or other
  entity duly organized, validly existing and in good standing
  under the laws of its jurisdiction of incorporation or
  organization, has all requisite power and authority and has
  been duly authorized by all necessary approvals and orders to
  own, lease and operate its assets and properties and to carry
  on its business as it is now being conducted and is duly
  qualified and in good standing to do business in each
  jurisdiction in which the nature of its business or the
  ownership or leasing of its assets and properties makes such
  qualification necessary, other than in such jurisdictions
  where the failure to so qualify and be in good standing, when
  taken together with all other such failures, would not have a
  material adverse effect on the business, operations,
  properties, assets, condition (financial or other), prospects
  or the results of operations of CILCORP and the CILCORP
  Subsidiaries taken as a whole or on the consummation of the
  transactions contemplated by this Agreement and the Second
  Merger (any such material adverse effect, a "CILCORP Material
  Adverse Effect").  The term "Subsidiary" of a person shall
  mean any corporation or other entity (including partnerships
  and other business associations and joint ventures) in which
  such person directly or indirectly owns at least a majority of
  the voting power represented by the outstanding capital stock
  or other voting securities or interests having voting power
  under ordinary circumstances to elect a majority of the
  directors or similar members of the governing body, or
  otherwise to direct the management and policies, of such
  corporation or entity and the term "CILCORP Subsidiary" shall
  mean a Subsidiary of CILCORP.  The term "Joint Venture" of a
  person shall mean any corporation or other entity (including
  partnerships and other business associations and joint
  ventures) in which such person directly or indirectly owns an
  equity interest that is less than a majority of any class of
  the outstanding voting securities or equity of any such
  entity, other than equity interests held for passive
  investment purposes which are less than 5% of any class of the
  outstanding voting securities or equity of any such entity,
  and the term "CILCORP Joint Venture" shall mean a Joint
  Venture of CILCORP.
  
           Section 4.2    Subsidiaries.  Section 4.2 of the
  disclosure schedule delivered by CILCORP to AES concurrent
  with the execution of this Agreement (the "CILCORP Disclosure
  Schedule") sets forth a list of all the CILCORP Subsidiaries
  and the CILCORP Joint Ventures, including the name of each
  such entity, a brief description of the principal line or
  lines of business conducted by each such entity and the
  interest of CILCORP and the CILCORP Subsidiaries therein.
  CILCORP is a "public-utility holding company" (as defined in
  the Public Utility Holding Company Act of 1935, as amended
  ("PUHCA")) exempt from all provisions (other than Section
  9(a)(2)) of PUHCA, pursuant to Section 3(a)(1) in accordance
  with Rule 2 of PUHCA, and Central Illinois Light Company
  ("CILCO") is a "public-utility company" within the meaning of
  Section 2(a)(5) of PUHCA.  With the exception of CILCO, no
  CILCORP Subsidiary or CILCORP Joint Venture is a "holding
  company" or a "public-utility company" within the meaning of
  Sections 2(a)(7) and 2(a)(5) of PUHCA, respectively, nor,
  except with respect to their relationship with CILCORP, are
  any of such entities an "affiliate" or a "subsidiary company"
  of a holding company within the meaning of Sections 2(a)(11)
  and 2(a)(8) of PUHCA, respectively. Except as set forth in
  Section 4.2 of the CILCORP Disclosure Schedule, (i) all of the
  issued and outstanding shares of capital stock of each CILCORP
  Subsidiary are validly issued, fully paid, nonassessable and
  free of preemptive rights and to the extent owned, directly or
  indirectly, by CILCORP, are owned free and clear of any liens,
  claims, encumbrances, security interests, charges and options
  of any nature whatsoever ("Liens"), and (ii) there are no
  outstanding subscriptions, options, calls, contracts, voting
  trusts, proxies or other pledges, security interests, claims,
  equities, charges, encumbrances, commitments, understandings,
  restrictions, arrangements, rights or warrants, including any
  right of conversion or exchange under any outstanding
  security, instrument or other agreement, obligating CILCORP or
  any CILCORP Subsidiary to issue, deliver or sell, pledge,
  grant a security interest or encumber, or cause to be issued,
  delivered or sold, pledged or encumbered or a security
  interest to be granted on, shares of capital stock of any
  CILCORP Subsidiary or obligating CILCORP or any CILCORP
  Subsidiary to grant, extend or enter into any such agreement
  or commitment.
  
           Section 4.3    Capitalization.
  
                (a)  CILCORP.  The authorized capital stock of
  CILCORP consists of 50,000,000 shares of common stock, no par
  value ( the "CILCORP Common Stock"), and 4,000,000 shares of
  preferred stock, no par value, none of which preferred stock
  is outstanding. As of the close of business on November 20,
  1998, (i) 13,610,680 shares of CILCORP Common Stock were
  issued and outstanding (such number of shares is hereinafter
  referred to as the "Outstanding Shares"), (ii) 125,000 shares
  of CILCORP Common Stock were reserved for issuance pursuant to
  the CILCORP Option Plan, and (iii) no shares of CILCORP Common
  Stock were held by CILCORP in its treasury or by its wholly
  owned Subsidiaries.  No bonds, debentures, notes or other
  indebtedness having the right to vote (or convertible into
  securities having the right to vote) on any matters on which
  stockholders may vote ("Voting Debt") are issued or
  outstanding.  All of the issued and outstanding shares of
  CILCORP Common Stock are validly issued, fully paid,
  nonassessable and free of preemptive rights.  Since December
  17, 1996, CILCORP has not issued any shares of capital stock
  of any class of CILCORP other than issuances of shares of
  CILCORP Common Stock pursuant to awards under the CILCORP
  Option Plan.  As of the date of this Agreement, except as set
  forth in Section 4.3(a) of the CILCORP Disclosure Schedule,
  there are no outstanding subscriptions, options, calls,
  contracts, voting trusts, proxies or other pledges, security
  interests, encumbrances, commitments, understandings,
  restrictions, arrangements, rights or warrants, including any
  right of conversion or exchange under any outstanding
  security, instrument or other agreement, obligating CILCORP or
  any CILCORP Subsidiary to issue, deliver or sell, pledge,
  grant a security interest or encumber, or cause to be issued,
  delivered or sold, pledged or encumbered or a security
  interest to be granted on, shares of capital stock or any
  Voting Debt of CILCORP or obligating CILCORP or any CILCORP
  Subsidiary to grant, extend or enter into any such agreement
  or commitment.  Except as set forth in Section 4.3(a) of the
  CILCORP Disclosure Schedule, there is no outstanding
  contractual commitment or obligation of CILCORP or any CILCORP
  Subsidiary to make any investment (in the form of a loan,
  capital contribution or otherwise) in any CILCORP Subsidiary
  or in any other person.
  
                (b)  CILCO.  The authorized capital stock of
  CILCO consists of 20,000,000 shares of common stock, no par
  value; 1,500,000 shares of preferred stock, par value $100 per
  share ("CILCO Preferred Stock"), consisting of 111,264 shares
  of 4.50  percent Series CILCO Preferred Stock ("4.50% Series
  Preferred"), 79,940 shares of 4.64 percent Series CILCO
  Preferred Stock ("4.64% Series Preferred"), and 1,308,796
  shares of Undesignated Series CILCO Preferred Stock
  ("Undesignated Series Preferred"); 3,500,000 shares of Class A
  preferred stock, no par value ("CILCO Class A Preferred
  Stock"), consisting of 220,000 shares of 5.85 percent Series
  CILCO Class A Preferred Stock ("5.85% Series Class A
  Preferred"), 250,000 shares of Flexible Auction Rate Series
  CILCO Class A Preferred Stock ("Flexible Auction Rate Series
  Class A Preferred"); and 3,030,000 shares of Undesignated
  Series CILCO Class A Preferred Stock ("Undesignated Series
  Class A Preferred"); and 2,000,000 shares of Undesignated
  Series CILCO Preference Stock, no par value ("CILCO Preference
  Stock").  With respect to the capital stock of CILCO, (i)
  13,563,871 shares of CILCO Common Stock are issued and
  outstanding, all of which are owned by CILCORP free and clear
  of any Liens and (ii) 111,264 shares of 4.50% Series
  Preferred, 79,940 shares of 4.64% Series Preferred, no shares
  of Undesignated Series Preferred, 220,000 shares of 5.85%
  Class A Series Preferred, 250,000 shares of Flexible Auction
  Rate Series Class A Preferred, 250,000 shares of Undesignated
  Series Class A Preferred and no shares of CILCO Preference
  Stock are issued and outstanding.  No Voting Debt is issued or
  outstanding.  All of the issued and outstanding shares of
  CILCO capital stock are validly issued, fully paid,
  nonassessable and free of preemptive rights.  Since the date
  hereof, CILCO has not issued any shares of capital stock of
  any class of CILCO.  As of the date of this Agreement, except
  as set forth in Section 4.3(b) of the CILCORP Disclosure
  Schedule, there are no outstanding subscriptions, options,
  calls, contracts, voting trusts, proxies or other pledges,
  security interests, encumbrances, commitments, understandings,
  restrictions, arrangements, rights or warrants, including any
  right of conversion or exchange under any outstanding
  security, instrument or other agreement, obligating CILCORP or
  any CILCORP Subsidiary to issue, deliver or sell, pledge,
  grant a security interest or encumber, or cause to be issued,
  delivered or sold, pledged or encumbered or a security
  interest to be granted on, shares of capital stock or any
  Voting Debt of CILCO or obligating CILCORP or any CILCORP
  Subsidiary to grant, extend or enter into any such agreement
  or commitment.
  
                (c)    Indebtedness.  Section 4.3(c)(i) of the
  CILCORP Disclosure Schedule sets forth a true and complete
  statement of the borrowing limit under all loan agreements
  (including indentures) of CILCORP and its Subsidiaries
  existing on the date hereof and Section 4.3(c)(ii) of the
  CILCORP Disclosure Schedule sets forth a true and complete
  statement of the total indebtedness of CILCORP and its
  Subsidiaries outstanding on the date hereof under such
  agreements.
  
           Section 4.4    Authority; Non-Contravention;
  Statutory Approvals; Compliance.
  
                (a)  Authority.  CILCORP has all requisite power
  and authority to enter into this Agreement and, subject to the
  receipt of the CILCORP Stockholders' Approval (as defined in
  Section 4.13 hereof) and the CILCORP Required Statutory
  Approvals (as defined in Section 4.4(c) hereof), to consummate
  the transactions contemplated hereby and, subject to receipt
  of the Second Merger Statutory Approvals (as defined in
  Section 4.4(c) hereof), to consummate the Second Merger if
  such were to be consummated.  The execution and delivery of
  this Agreement and the consummation by CILCORP of the
  transactions contemplated hereby have been duly authorized by
  all necessary corporate action on the part of CILCORP, subject
  to obtaining the CILCORP Stockholders' Approval.  This
  Agreement has been duly and validly executed and delivered by
  CILCORP, and, assuming the due authorization, execution and
  delivery hereof by the other signatories hereto, this
  Agreement constitutes the valid and binding obligation of
  CILCORP enforceable against it in accordance with its terms,
  except as enforceability may be limited by bankruptcy,
  insolvency, reorganization, moratorium or other similar laws
  affecting the enforcement of creditors' rights generally and
  by general equitable principles (regardless of whether such
  enforceability is considered in a proceeding in equity or at
  law).
  
                (b)  Non-Contravention.  The execution and
  delivery of this Agreement by CILCORP do not, and the
  consummation of the Merger and the other transactions
  contemplated hereby and if such were consummated, the Second
  Merger, will not, in any respect, violate, conflict with or
  result in a breach of any provision of, or constitute a
  default (with or without notice or lapse of time or both)
  under, or result in the termination or modification of, or
  accelerate the performance required by, or result in a right
  of termination, cancellation or acceleration of any obligation
  or the loss of a benefit under, or result in the creation of
  any lien, security interest, charge or encumbrance upon any of
  the properties or assets of CILCORP or any of the CILCORP
  Subsidiaries or the imposition or administration of any other
  penalty or fee (any such violation, conflict, breach, default,
  right of termination, modification, cancellation or
  acceleration, loss, creation or imposition, is referred to
  herein as a "Violation" with respect to CILCORP, the CILCORP
  Subsidiaries and the CILCORP Joint Ventures, and such term
  when used in Article V shall have a correlative meaning with
  respect to AES) pursuant to any provisions of (i) the Articles
  of Incorporation, By-Laws or similar governing documents of
  CILCORP or any of the CILCORP Subsidiaries or the CILCORP
  Joint Ventures, (ii) subject to obtaining the CILCORP Required
  Statutory Approvals (as defined in Section 4.4(c) hereof), the
  Second Merger Statutory Approvals (as defined in Section
  4.4(c) hereof) and the receipt of the CILCORP Stockholders'
  Approval, any statute, law, ordinance, rule, regulation,
  judgment, decree, order, injunction, writ, permit or license
  of any court, federal, state, local or foreign governmental or
  regulatory body (including a stock exchange or other
  self-regulatory body) or authority (each, a "Governmental
  Authority") applicable to CILCORP or any of the CILCORP
  Subsidiaries or the CILCORP Joint Ventures or any of their
  respective properties or assets or (iii) subject to obtaining
  the third-party consents set forth in Section 4.4(b)(i) of the
  CILCORP Disclosure Schedule for the Second Merger (the
  "CILCORP Second Merger Required Consents"), and set forth in
  Section 4.4(b)(ii) of the CILCORP Disclosure Schedule for the
  Merger and the other transactions contemplated hereby (the
  "CILCORP Required Consents"), any note, bond, mortgage,
  indenture, deed of trust, license, franchise, permit,
  concession, contract, lease or other instrument, obligation or
  agreement of any kind to which CILCORP or any of the CILCORP
  Subsidiaries or the CILCORP Joint Ventures is a party or by
  which it or any of its properties or assets may be bound or
  affected, excluding from the foregoing clauses (ii) and (iii)
  such Violations which would not, in the aggregate, have a
  CILCORP Material Adverse Effect.
  
                (c)  Statutory Approvals. No declaration, filing
  or registration with, or notice to or authorization, consent
  or approval of, any Governmental Authority is necessary for
  the execution and delivery of this Agreement by CILCORP or the
  consummation by CILCORP of the Merger and the other
  transactions contemplated hereby, except as described in
  Section 4.4(c)(i) of the CILCORP Disclosure Schedule, (the
  "CILCORP Required Statutory Approvals") and except as
  described in Section 4.4(c)(ii) of the CILCORP Disclosure
  Schedule with respect to the Second Merger (the "Second Merger
  Statutory Approvals"), it being understood that references in
  this Agreement to "obtaining" such CILCORP Required Statutory
  Approvals and Second Merger Statutory Approvals shall mean
  making such declarations, filings or registrations; giving
  such notices; obtaining such authorizations, consents or
  approvals; and having such waiting periods expire as are
  necessary to avoid a violation of law.
  
                (d)  Compliance.  Except as set forth in Section
  4.4(d) of the CILCORP Disclosure Schedule or in Section 4.11
  hereof, or as disclosed in the CILCORP SEC Reports (as defined
  in Section 4.5 hereof) filed on or prior to the date of this
  Agreement, neither CILCORP nor any of the CILCORP Subsidiaries
  nor, to the knowledge of CILCORP, any CILCORP Joint Venture is
  in violation of, is, to the knowledge of CILCORP, under
  investigation with respect to any violation of, or has been
  given notice of or been charged with any violation of, any
  law, statute, order, rule, regulation, ordinance or judgment,
  permit, license, concession or franchise (including, without
  limitation, any applicable environmental law, ordinance or
  regulation) of any Governmental Authority, except for
  violations or failures to comply with Environmental Laws
  (which are the subject of Section 4.11 hereof) and except for
  violations which individually or in the aggregate do not, and
  insofar as reasonably can be foreseen will not, have a CILCORP
  Material Adverse Effect. Except as set forth in Section 4.4(d)
  or 4.11 of the CILCORP Disclosure Schedule, CILCORP and the
  CILCORP Subsidiaries and, to the knowledge of CILCORP, the
  CILCORP Joint Ventures have all permits, licenses, franchises
  and other governmental authorizations, consents, approvals and
  exemptions necessary to conduct their businesses as presently
  conducted which are material to the operation of the busi
  nesses of CILCORP and the CILCORP Subsidiaries.  Except as set
  forth in Section 4.4(d) of the CILCORP Disclosure Schedule and
  Section 4.11 hereof, CILCORP and each of the CILCORP
  Subsidiaries and, to the knowledge of CILCORP, each of the
  CILCORP Joint Ventures is not in breach or violation of or in
  default in the performance or observance of any term or
  provision of, and no event has occurred which, with lapse of
  time or action by a third party, could result in a default by
  CILCORP or any CILCORP Subsidiary or, to the knowledge of
  CILCORP, any CILCORP Joint Venture under (i) its Articles of
  Incorporation, By-Laws or other organizational documents or
  (ii) any contract, commitment, agreement, indenture, mortgage,
  loan agreement, note, lease, bond, license, approval or other
  instrument to which it is a party or by which CILCORP or any
  CILCORP Subsidiary or any CILCORP Joint Venture is bound or to
  which any of its property is subject, except in the case of
  clause (ii) above, for violations, breaches or defaults which
  individually or in the aggregate do not, and insofar as
  reasonably can be foreseen will not, have a CILCORP Material
  Adverse Effect.
  
           Section 4.5    Reports and Financial Statements.  The
  filings required to be made by CILCORP and the CILCORP
  Subsidiaries under the Securities Act of 1933, as amended (the
  "Securities Act"), the Securities Exchange Act of 1934, as
  amended (the "Exchange Act"), PUHCA, the Federal Power Act
  (the "Power Act") and applicable state, municipal, local and
  other laws, including franchise and public utility laws and
  regulations, including all forms, statements, reports,
  agreements (oral or written) and all documents, exhibits,
  amendments and supplements appertaining thereto, have been
  filed with the SEC, the Federal Energy Regulatory Commission
  (the "FERC") and the appropriate Illinois or other appropriate
  Governmental Authorities, as the case may be, and complied, as
  of their respective dates, in all material respects with all
  applicable requirements of the appropriate statutes and the
  rules and regulations thereunder.  CILCORP has made available
  to AES a true and complete copy of each report, schedule,
  registration statement and definitive proxy statement and all
  amendments thereto filed with the SEC by CILCORP or any
  CILCORP Subsidiary (or their predecessors) pursuant to the
  requirements of the Securities Act or Exchange Act since
  January 1, 1996 (as such documents have since the time of
  their filing been amended, the "CILCORP SEC Reports").  As of
  their respective dates, the CILCORP SEC Reports did not
  contain any untrue statement of a material fact or omit to
  state a material fact required to be stated therein or
  necessary to make the statements therein, in light of the
  circumstances under which they were made, not misleading.  The
  audited consolidated financial statements and unaudited
  interim financial statements of CILCORP and CILCO included in
  the CILCORP SEC Reports (collectively, the "CILCORP Financial
  Statements") have been prepared in accordance with generally
  accepted accounting principles applied on a consistent basis
  ("GAAP") (except as may be indicated therein or in the notes
  thereto) and fairly present the financial position of CILCORP
  and CILCO, as the case may be, as of the dates thereof and the
  results of their operations and cash flows for the periods
  then ended, subject, in the case of the unaudited interim
  financial statements, to normal, recurring audit adjustments.
  True, accurate and complete copies of the Articles of
  Incorporation and By-Laws of CILCORP and CILCO, as in effect
  on the date of this Agreement, are included (or incorporated
  by reference) in the CILCORP SEC Reports.
  
           Section 4.6    Absence of Certain Changes or Events;
  Absence of Undisclosed Liabilities.
  
                (a)  Absence of Certain Changes or Events.
  Except as set forth in Section 4.6(a) of the CILCORP
  Disclosure Schedule or as disclosed in the CILCORP SEC Reports
  filed prior to the date of this Agreement, since December 31,
  1997, CILCORP and each of the CILCORP Subsidiaries and, to the
  knowledge of CILCORP, each of the CILCORP Joint Ventures, have
  conducted their business only in the ordinary course of
  business consistent with past practice and there has not been,
  and no fact or condition exists which would have or, insofar
  as reasonably can be foreseen, could have, a CILCORP Material
  Adverse Effect.
  
                (b)  Absence of Undisclosed Liabilities.  Except
  as set forth in Section 4.6(b) of the CILCORP Disclosure
  Schedule or as disclosed in the CILCORP SEC Reports filed
  prior to the date of this Agreement, and except for
  liabilities, obligations or contingencies which are accrued or
  reserved against in the consolidated financial statements of
  CILCORP and CILCO or reflected in the notes thereto for the
  year ended December 31, 1997, or which were incurred after
  December 31, 1997 in the ordinary course of business and would
  not, in the aggregate, have a CILCORP Material Adverse Effect,
  neither CILCORP nor any CILCORP Subsidiary, nor, to the
  knowledge of CILCORP, any CILCORP Joint Venture, has any
  liabilities or obligations (whether absolute, accrued,
  contingent or otherwise and including, without limitation,
  margin loans) which are material to CILCORP and the CILCORP
  Subsidiaries taken as a whole.
  
           Section 4.7    Litigation.  Except as set forth in
  Section 4.7 of the CILCORP Disclosure Schedule or as disclosed
  in the CILCORP SEC Reports filed prior to the date of this
  Agreement, (a) there are no claims, suits, actions or
  proceedings pending before any court, Governmental Authority
  or any arbitrator or, to the knowledge of CILCORP, threatened,
  nor are there, to the knowledge of CILCORP, any investigations
  or reviews by any court, Governmental Authority or any
  arbitrator pending or threatened against, relating to or
  affecting CILCORP or any of the CILCORP Subsidiaries or, to
  the knowledge of CILCORP, the CILCORP Joint Ventures, (b)
  there have not been any significant developments since
  December 31, 1997 with respect to such disclosed claims,
  suits, actions, proceedings, investigations or reviews and (c)
  there are no judgments, decrees, injunctions, rules or orders
  of any Governmental Authority or any arbitrator applicable to
  CILCORP or any of the CILCORP Subsidiaries or, to the knowl
  edge of CILCORP, applicable to any of the CILCORP Joint
  Ventures, which, when taken together with any other
  nondisclosures described in clauses (a), (b) or (c), could, if
  determined adversely to CILCORP, any CILCORP Subsidiary or any
  CILCORP Joint Venture, have a CILCORP Material Adverse Effect.
  
           Section 4.8    Proxy Statement.   At the dates mailed
  to stockholders of CILCORP and at the time of the meeting of
  such stockholders to be held in connection with the Merger and
  the other transactions contemplated hereby, the Proxy
  Statement (as defined in Section 7.2(a) hereof),  (i) will not
  contain any untrue statement of a material fact or omit to
  state any material fact required to be stated therein or
  necessary in order to make the statements therein, in light of
  the circumstances under which they are made, not misleading
  and (ii) will comply as to form in all material respects with
  the provisions of the Exchange Act and the rules and
  regulations thereunder, provided, however, CILCORP makes no
  representation or warranty as to any information provided by
  AES pursuant to Section 5.5 hereof.
  
           Section 4.9     Tax Matters.  For purposes of this
  Agreement:  (i) "Taxes" (including, with correlative meaning,
  the word "Tax") shall include any and all federal, state,
  county, local, foreign or other taxes, charges, imposts,
  rates, fees, levies or other assessments, including, without
  limitation, all net income, gross income, sales and use, ad
  valorem, transfer, gains, profits, excise, franchise, real and
  personal property, gross receipt, capital stock, production,
  business and occupation, disability, employment, payroll,
  license, estimated, stamp, custom duties, severance,
  withholding or other taxes, fees, assessments or charges of
  any kind whatsoever, together with any interest and penalties
  (civil or criminal) on or additions to any such taxes and any
  expenses incurred in connection with the determination,
  settlement or litigation of any tax liability, (ii) "Taxing
  Authority" means any Governmental Authority or any
  subdivision, agency, court, commission, instrumentality or
  official thereof or any quasi-governmental or private body
  having jurisdiction over the assessment, determination,
  collection, imposition or administration of any Tax (including
  the Internal Revenue Service (the "IRS")) and (iii)  "Tax
  Return" means any return, report, information return,
  schedule, certificate, statement or other document (including
  any related or supporting information) required to be filed
  with or supplied to, or, where none is required to be filed
  with or supplied to a Taxing Authority, the statement or other
  document issued by, a Taxing Authority in connection with any
  Tax (including, without limitation, any combined, consolidated
  or unitary returns for any group of entities that includes
  CILCORP or any CILCORP Subsidiary).  Except as specifically
  identified in the relevant section of the CILCORP Disclosure
  Schedule:
  
                (a)  Filing of Timely Tax Returns.  CILCORP and
  each of the CILCORP Subsidiaries have timely filed (or there
  has been timely filed on their behalf) all Tax Returns
  required to be filed by or on behalf of each of them under
  applicable law.  All such Tax Returns were and are in all
  material respects true, complete and correct.
  
                (b)  Payment of Taxes.  CILCORP and each of the
  CILCORP Subsidiaries have, within the time and in the manner
  prescribed by law, paid all Taxes that are due and payable
  from them.
  
                (c)  Tax Reserves.   The accrual for Taxes on
  the most recent CILCORP Financial Statements is in an amount
  at least equal to the sum of CILCORP' and the CILCORP
  Subsidiaries' liability for Taxes (other than Taxes previously
  paid over to the appropriate Taxing Authority) for all Tax
  periods (and portions thereof) ending on or before the date of
  such financial statements plus their deferred Tax liability.
  
                (d)  Tax Liens.  There are no Tax liens upon the
  assets, properties or business of CILCORP or any of the
  CILCORP Subsidiaries except liens for Taxes not yet due or
  being contested in good faith through appropriate proceedings
  and for which adequate reserves have been established in the
  CILCORP Financial Statements.
  
                (e)  Withholding Taxes.  CILCORP and each of the
  CILCORP Subsidiaries have complied in all material respects
  with the provisions of the Internal Revenue Code of 1986, as
  amended (the "Code") and all other applicable laws relating to
  the payment and withholding of Taxes, including, without
  limitation, the withholding and reporting requirements under
  Code Sections 1441 through 1464, 3401 through 3406 and 6041
  through 6049, as well as similar provisions under any other
  laws, and have, within the time and in the manner prescribed
  by law, withheld from employee wages and paid over to the
  proper Taxing Authorities all amounts required.
  
                (f)  Extensions of Time for Filing Tax Returns.
  Neither CILCORP nor any of the CILCORP Subsidiaries has
  requested any extension of time within which to file any Tax
  Return, which Tax Return has not since been timely filed.
  
                (g)  Waivers of Statute of Limitations.  Neither
  CILCORP nor any of the CILCORP Subsidiaries has executed any
  outstanding waivers or comparable consents regarding the
  application of the statute of limitations with respect to any
  Taxes or Tax Returns.
  
                (h)  Expiration of Statute of Limitations.  The
  statutes of limitations for the assessment of all Taxes with
  respect to all Tax Returns of CILCORP and the CILCORP
  Subsidiaries for all Tax periods have expired.  Prior to the
  date of this Agreement, CILCORP has provided AES with written
  schedules of (i) the Tax years of CILCORP and each CILCORP
  Subsidiary for which any statute of limitation with respect to
  any Tax has not expired and (ii) with respect to any franchise
  Tax and any Tax based on net income, gross receipts or gross
  income, for all Tax years of CILCORP and each CILCORP
  Subsidiary for which the statutes of limitations have not yet
  expired, those years for which examinations have been
  completed, those years for which examinations are presently
  being conducted, and those years for which examinations have
  not yet been initiated. No deficiency for any Taxes has been
  proposed, asserted or assessed against CILCORP or any of the
  CILCORP Subsidiaries that has not been resolved and paid in
  full.
  
                (i)  Audit, Administrative and Court
  Proceedings.  No audits or other proceedings by any Taxing
  Authority are presently pending, or, to the knowledge of
  CILCORP or any of the CILCORP Subsidiaries, threatened, with
  regard to any Taxes or Tax Returns of CILCORP or any of the
  CILCORP Subsidiaries.
  
                (j)  Powers of Attorney.  No power of attorney
  currently in force has been granted by CILCORP or any of the
  CILCORP Subsidiaries concerning any Tax matter.
  
                (k)  Tax Rulings.  Neither CILCORP nor any of
  the CILCORP Subsidiaries has received or requested a Tax
  Ruling or entered into a Closing Agreement with any taxing
  authority that would have a continuing adverse effect after
  the Closing Date.  "Tax Ruling," as used in this Agreement,
  shall mean any written ruling of (or other written guidance
  from) a Taxing Authority relating to Taxes.  "Closing
  Agreement," as used in this Agreement, shall mean a written
  and legally binding agreement with a Taxing Authority relating
  to Taxes.
  
                (l)  Availability of Tax Returns.  CILCORP has
  made available to AES complete and accurate copies of (i) all
  Tax Returns for open years, and any amendments thereto, filed
  by or on behalf of CILCORP or any of the CILCORP Subsidiaries,
  (ii) all audit reports or written proposed adjustments
  (whether formal or informal) received from any Taxing
  Authority relating to any Tax Return filed by or on behalf of
  CILCORP or any of the CILCORP Subsidiaries and (iii) any Tax
  Ruling or request for a Tax Ruling applicable to CILCORP or
  any of the CILCORP Subsidiaries and Closing Agreements entered
  into by CILCORP or any of the CILCORP Subsidiaries.
  
                (m)  Tax Sharing Agreements.  Neither CILCORP
  nor any CILCORP Subsidiary is a party to, is bound by, or has
  any obligation under, any agreement relating to the allocation
  or sharing of Taxes or has any liability for the Taxes of any
  person other than CILCORP or the CILCORP Subsidiaries, as a
  transferee, or successor or otherwise (including, without
  limitation, any liability under Treasury Regulation Section
  1.1502-6 or any similar provision of state, local or foreign
  law).
  
                (n)  Code Section 341(f).  Neither CILCORP nor
  any of the CILCORP Subsidiaries has filed (or will file prior
  to the Closing) a consent pursuant to Code Section 341(f) or
  has agreed to have Code Section 341(f)(2) apply to any disposi
  tion of a subsection (f) asset (as that term is defined in
  Code Section 341(f)(4)) owned by CILCORP or any of the CILCORP
  Subsidiaries.
  
                (o)  Code Section 168.  No property of CILCORP
  or any of the CILCORP Subsidiaries is property that CILCORP or
  any CILCORP Subsidiary or any party to this transaction is or
  will be required to treat as being owned by another person
  pursuant to the provisions of Code Section 168(f)(8) (as in
  effect prior to its amendment by the Tax Reform Act of 1986)
  or is "tax-exempt use property" within the meaning of Code
  Section 168(h).
  
                (p)  Code Section 481 Adjustments.  Neither
  CILCORP nor any of the CILCORP Subsidiaries is required to
  include in income for any Tax period ending after the date
  hereof any adjustment pursuant to Code Section 481(a) by
  reason of a voluntary change in accounting method of CILCORP
  or any of the CILCORP Subsidiaries, nor has the IRS proposed
  any such adjustment or change in accounting method.
  
                (q)  Acquisition Indebtedness.  No indebtedness
  of CILCORP or any of the CILCORP Subsidiaries is "corporate
  acquisition indebtedness" within the meaning of Code Section
  279(b) or an "applicable high yield discount obligation"
  within the meaning of Code Section 163(i).
  
                (r)  Consolidated Tax Returns.  Neither CILCORP
  nor any of the CILCORP Subsidiaries has ever been a member of
  an affiliated group of corporations (within the meaning of
  Code Section 1504(a)) filing consolidated Tax Returns, other
  than the affiliated group of which CILCORP is the common
  parent.
  
                (s)  5% Foreign Stockholders.  Based on any
  Schedule 13D and 13G filings with the SEC with respect to
  CILCORP and any other relevant information within CILCORP's
  knowledge, no foreign person has owned 5% or more of the
  outstanding shares of CILCORP Common Stock at any time during
  the five year period ending on the Closing Date.
  
           Section 4.10   Employee Matters; ERISA.
  
                (a)  Benefit Plans.  Section 4.10(a) of the
  CILCORP Disclosure Schedule contains a true and complete list
  of each employee benefit plan, practice, program or
  arrangement currently sponsored, maintained or contributed to
  by CILCORP or any of the CILCORP Subsidiaries for the benefit
  of employees, former employees or directors and their
  beneficiaries in respect of services provided to any such
  entity, including, but not limited to, any employee benefit
  plans within the meaning of Section 3(3) of the Employee
  Retirement Income Security Act of 1974, as amended ("ERISA"),
  any employee pension benefit plan, program, arrangement or
  agreement, any health, medical, welfare, disability, life
  insurance, bonus, option, stock appreciation plan, performance
  stock plan, restricted stock plan, deferred compensation plan,
  retiree benefits plan, severance pay and other employee
  benefit or fringe benefit plan and any employment, consulting,
  non-compete, severance or change in control agreement
  (collectively, the "CILCORP Benefit Plans"), together with,
  for any option, stock appreciation plan, performance stock
  plan, restricted stock plan, deferred compensation plan and
  supplemental retirement plan, the current amounts or benefits
  granted or payable under each and reasonable details
  (including exercise prices) regarding the outstanding options
  to purchase shares of CILCORP Common Stock (the "CILCORP
  Options") or other securities which represent the right
  (contingent or other) to purchase or receive shares of CILCORP
  Common Stock or, following the Merger, of the common stock, no
  par value, of the Surviving Corporation or of the common
  stock, par value $.01 per share, of AES ("AES Common Stock").
  For the purposes of this Section 4.10, the term "CILCORP"
  shall be deemed to include predecessors thereof.
  
                (b)  Contributions.  Except as set forth in
  Section 4.10(a) of the CILCORP Disclosure Schedule, all
  material contributions and other payments required to be made
  by CILCORP or any of the CILCORP Subsidiaries to any CILCORP
  Benefit Plan (or to any person pursuant to the terms thereof)
  have been timely made or the amount of such payment or
  contribution obligation has been reflected in the CILCORP
  Financial Statements.  Except as set forth in Section 4.10(a)
  of the CILCORP Disclosure Schedule, (i) the current value of
  all accrued benefits under any CILCORP Benefit Plan does not
  exceed the current value of the assets of such plan and (ii)
  neither CILCORP nor any entity which is or ever has been
  considered as a single employer together with CILCORP or CILCO
  pursuant to Section 414 of the Code contributes or has
  contributed, during the eight-year period immediately prior to
  the date of this Agreement, to a multiemployer plan (as
  defined in Section 3(37) of ERISA), or has any liability under
  ERISA Section 4203 or Section 4205 in respect of any such
  plan.
  
                (c)  Qualification; Compliance.  Except as set
  forth in Section 4.10(c) of the CILCORP Disclosure Schedule,
  each of the CILCORP Benefit Plans intended to be "qualified"
  within the meaning of Section 401(a) of the Code has been
  determined by the IRS to be so qualified, and no circumstances
  exist that are reasonably expected by CILCORP to result in the
  revocation of any such determination.  CILCORP and each of the
  CILCORP Subsidiaries are in compliance in all material
  respects with, and each CILCORP Benefit Plan is and has been
  operated in all material respects in compliance with the terms
  thereof and all applicable laws, rules and regulations
  governing such plan, including, without limitation, ERISA and
  the Code.  Each CILCORP Benefit Plan intended to provide for
  the deferral of income, the reduction of salary or other
  compensation or to afford other income Tax benefits complies
  in all material respects with the requirements of the
  applicable provisions of the Code or other laws, rules and
  regulations required to provide such income Tax benefits.
  
                (d)  Liabilities.  With respect to the CILCORP
  Benefit Plans individually and in the aggregate, there are no
  actions, suits, claims (other than claims for benefits in the
  ordinary course) pending or, to the knowledge of CILCORP,
  threatened and no event has occurred, and, there exists no
  condition or set of circumstances that could subject CILCORP
  or any of the CILCORP Subsidiaries to any liability arising
  under the Code, ERISA or any other applicable law including,
  without limitation, any liability of any kind whatsoever,
  whether direct or indirect, contingent, inchoate or otherwise,
  to any such plan or the Pension Benefit Guaranty Corporation
  (the "PBGC"), or under any indemnity agreement to which
  CILCORP or any of the CILCORP Subsidiaries is a party, in each
  such case, which liability, individually or in the aggregate,
  could reasonably be expected to have a CILCORP Material
  Adverse Effect.
  
                (e)  Welfare Plans.  Except as set forth in
  Section 4.10(e) of the CILCORP Disclosure Schedule, none of
  the CILCORP Benefit Plans that are "welfare plans", within the
  meaning of Section 3(1) of ERISA, provides for any benefits
  payable to or on behalf of any employee or director after
  termination of employment or service, or after retirement, as
  the case may be, other than elective continuation required
  pursuant to Code Section 4980B or coverage which expires at
  the end of the calendar month following such event.  Each such
  plan that is a "group health plan" (as defined in Code Section
  4980B(g)) has been operated in compliance with Code Section
  4980B in all material respects at all times.
  
                (f)  Documents Made Available.  CILCORP has made
  available to AES a true and correct copy of each collective
  bargaining agreement to which CILCORP or any of the CILCORP
  Subsidiaries is a party or under which CILCORP or any of the
  CILCORP Subsidiaries has obligations, and with respect to each
  CILCORP Benefit Plan, to the extent applicable, (i) such plan
  and summary plan description (including all amendments to each
  such document), (ii) the most recent annual report filed with
  the IRS, (iii) each related trust agreement, insurance
  contract, service provider or investment management agreement
  (including all amendments to each such document), (iv) the
  most recent determination of the IRS with respect to the
  qualified status of such plan, (v) the most recent actuarial
  report or valuation and (vi) all material employee
  communications.
  
                (g)  Payments Resulting from Merger and Other
  Severance Payments.  Except as set forth in Section 4.10(g) of
  the CILCORP Disclosure Schedule or as specifically provided
  for in this Agreement, (i) the announcement or consummation of
  the Merger or any other transaction contemplated by this
  Agreement or the Second Merger will not (either alone or upon
  the occurrence of any additional or further acts or events,
  including, without limitation, termination of employment)
  result in any (A) payment (whether of severance pay or
  otherwise) becoming due from CILCORP or any of the CILCORP
  Subsidiaries to any officer, employee, former employee or
  director thereof or to the trustee under any "rabbi trust" or
  similar arrangement or (B) benefit being established or
  becoming accelerated, vested or payable under any CILCORP
  Benefit Plan and (ii) neither CILCORP nor any of the CILCORP
  Subsidiaries is a party to (A) any management, employment,
  deferred compensation, severance (including any payment, right
  or benefit resulting from a  change in  control), bonus or
  other contract for personal services with any officer,
  director or employee, (B) any consulting contract with any
  person who prior to entering into such contract was a director
  or officer of CILCORP or any of the CILCORP Subsidiaries or
  (C) any material plan, agreement, arrangement or understanding
  similar to the foregoing.
  
                (h)  Labor Agreements.  As of the date hereof,
  except as set forth in Section 4.10(h) of the CILCORP
  Disclosure Schedule, neither CILCORP nor any of the CILCORP
  Subsidiaries is a party to or bound by any collective
  bargaining agreement or other labor agreement with any union
  or labor organization, or work rules or practices agreed to
  with any labor organization or employee association applicable
  to employees of CILCORP or any of the CILCORP Subsidiaries.
  To the knowledge of CILCORP, as of the date hereof, there is
  no current union representation question involving employees
  of CILCORP or any of the CILCORP Subsidiaries, nor does
  CILCORP know of any activity or proceeding of any labor
  organization (or representative thereof) or employee group to
  organize any such employees.  There are no written personnel
  policies, rules or procedures applicable to employees of
  CILCORP or any of the CILCORP Subsidiaries, other than those
  set forth in Section 4.10(h) of the CILCORP Disclosure
  Schedule, true and correct copies of which have heretofore
  been delivered to AES.  Except as set forth in Section 4.10(h)
  of the CILCORP Disclosure Schedule, (i) there is no grievance
  arising out of any collective bargaining agreement or other
  grievance procedure, unfair labor practice, employment
  discrimination or other investigation, charge or complaint
  against CILCORP or any of the CILCORP Subsidiaries pending or,
  to the knowledge of CILCORP, threatened, which has or could
  reasonably be expected to have a CILCORP Material Adverse
  Effect, (ii) there is no strike, dispute, slowdown, work
  stoppage or lockout pending, or, to the knowledge of CILCORP,
  threatened, against or involving CILCORP or any of the CILCORP
  Subsidiaries which has or could reasonably be expected to
  have, a CILCORP Material Adverse Effect and during the past
  five years there has not been any such action, (iii) there is
  no proceeding, claim, suit, action or governmental
  investigation pending or, to the knowledge of CILCORP,
  threatened, in respect of which any director, officer,
  employee or agent of CILCORP or any of the CILCORP
  Subsidiaries is or may be entitled to claim indemnification
  from CILCORP pursuant to their respective Articles of
  Incorporation or By-Laws or as provided in the Indemnification
  Agreements listed in Section 4.10(h) of the CILCORP Disclosure
  Schedule.  Except as set forth in Section 4.10(h) of the
  CILCORP Disclosure Schedule, CILCORP and the CILCORP
  Subsidiaries have complied in all material respects with all
  laws relating to the employment of labor, including without
  limitation any provisions thereof relating to wages, hours,
  collective bargaining and the payment of social security and
  similar Taxes, and no person has, to the knowledge of CILCORP,
  asserted that CILCORP or any of the CILCORP Subsidiaries is
  liable in any material amount for any arrears of wages or any
  Taxes or penalties for failure to comply with any of the
  foregoing.  Since the enactment of the Worker Adjustment and
  Retraining Notification Act (the "WARN Act"), neither CILCORP
  nor any of the CILCORP Subsidiaries has effectuated, without
  complying with the applicable requirements of the WARN Act,
  (a) a "plant closing" (as defined in the WARN Act) affecting
  any site of employment or one or more facilities or operating
  units within any site of employment or facility of CILCORP or
  any of the CILCORP Subsidiaries; or (b) a "mass layoff" (as de
  fined in the WARN Act) affecting any site of employment or
  facility of CILCORP or any of the CILCORP Subsidiaries; nor
  has CILCORP or any of the CILCORP Subsidiaries been affected
  by any transaction or engaged in layoffs or employment termina
  tions sufficient in number to trigger application of any simi
  lar state, local or foreign law or regulation without
  complying with the applicable requirements of such law or
  regulation.
  
                (i)  Parachute Payments.  Section 4.10(i)(a) of
  the CILCORP Disclosure Schedule sets forth (i) the name of
  each employee, former employee or other person who is or was
  providing services to CILCORP or any of the CILCORP Subsidiar
  ies and who, in connection with the Merger, the other
  transactions contemplated by this Agreement or the Second
  Merger, will receive, or will or may become entitled to
  receive in the future or upon termination of such person's
  employment, any payments (including, without limitation,
  accelerated vesting of CILCORP Options or other equity-based
  awards) which could reasonably be expected to constitute
  "excess parachute payments" with respect to such person within
  the meaning of Section 280G of the Code ("Excess Parachute
  Payments") and (ii) a description of the arrangements that
  could give rise to such Excess Parachute Payments.  Section
  4.10(i)(b) of the CILCORP Disclosure Schedule sets forth the
  maximum sum of the aggregate change in control payments and
  entitlements (including, without limitation, accelerated
  vesting of CILCORP Options or other equity-based awards) which
  any employee, former employee, or other person who is or was
  providing services to CILCORP or any of the CILCORP
  Subsidiaries may be entitled to receive now or in the future
  (including upon termination of such person's employment) in
  connection with the Merger, the other transactions
  contemplated by this Agreement and the Second Merger.  Section
  4.10(i)(c) of the CILCORP Disclosure Schedule sets forth the
  maximum sum of (i) the Tax cost associated with the loss of
  deductions under Section 280G with respect to such Excess
  Parachute Payments and (ii) the amount of any excise taxes
  that may be imposed with respect to such Excess Parachute
  Payments and any gross-ups on such amounts.
  
                (j)  Section 162(m).  Except as set forth in
  Section 4.10(j) of the CILCORP Disclosure Schedule, no
  payments to any executive officer of CILCORP or any of the
  CILCORP Subsidiaries will fail to be deductible for federal
  income Tax purposes by reason of the deduction limit imposed
  under Section 162(m) of the Code.  Section 4.10(j) of the
  CILCORP Disclosure Schedule sets forth the name of each
  executive officer who will receive compensation which may not
  be fully deductible by reason of the application of Section
  162(m), and a reasonable estimate of the amount of such
  potentially nondeductible compensation.
  
           Section 4.11   Environmental Protection.
  
                (a)  Definitions.  As used in this Agreement:
  
                     (i)  "Environmental Claim" means any and
  all written administrative, regulatory or judicial actions,
  suits, demands, demand letters, directives, claims, liens,
  investigations, proceedings or notices of noncompliance or
  violation by any person or entity (including any Governmental
  Authority) alleging potential liability (including, without
  limitation, potential responsibility for or liability for
  enforcement, investigatory costs, cleanup costs, spent fuel or
  waste disposal costs, decommissioning costs, governmental
  response costs, removal costs, remediation costs, natural
  resources damages, property damages, personal injuries or
  civil or criminal penalties) arising out of, based on or
  resulting from (A) the presence, Release or threatened Release
  into the environment of any Hazardous Materials at any
  location or (B) circumstances forming the basis of any
  violation or alleged violation of any Environmental Law or (C)
  any and all claims by any third party seeking damages,
  contribution, indemnification, cost recovery, compensation or
  injunctive relief resulting from the presence or Release of
  any Hazardous Materials.
  
                     (ii) "Environmental Laws" means all
  applicable federal, state and local laws, rules, regulations,
  ordinances, orders, directives and any binding judicial or
  administrative interpretation thereof, and common law and
  equitable doctrines relating to pollution, the environment
  (including, without limitation, indoor or ambient air, surface
  water, groundwater, land surface or subsurface strata) or
  protection of human health or safety as it relates to the
  environment including, without limitation, those relating to
  Releases or threatened Releases of Hazardous Materials, or
  otherwise relating to the manufacture, generation, processing,
  distribution, use, treatment, storage, disposal, transport or
  handling of Hazardous Materials.
  
                     (iii)     "Hazardous Materials" means (A)
  any petroleum or petroleum products, radioactive materials,
  asbestos in any form that is or could become friable, urea
  formaldehyde foam insulation and transformers or other
  equipment that contain dielectric fluid containing
  polychlorinated biphenyls; (B) any chemicals, materials or
  substances which are now defined as or included in the
  definition of "hazardous substances,"  "hazardous wastes,"
  "hazardous materials," "extremely hazardous wastes,"
  "restricted hazardous wastes," "toxic substances," "toxic
  pollutants" or words of similar import under any Environmental
  Law; and (C) any other chemical, material, substance or waste,
  exposure to which is now prohibited or regulated under any
  Environmental Law.
  
                     (iv) "Release" means any release, spill,
  emission, leaking, injection, deposit, disposal, discharge,
  dispersal, leaching or migration into the atmosphere, soil,
  sediments, surface water, groundwater or property.
  
                (b)  Compliance.  Except as set forth in Section
  4.11(b)(i) of the CILCORP Disclosure Schedule, CILCORP and
  each of the CILCORP Subsidiaries and, to the knowledge of
  CILCORP, the CILCORP Joint Ventures, are in compliance with
  all applicable Environmental Laws except where the failure to
  so comply would not have a CILCORP Material Adverse Effect,
  and neither CILCORP nor any of the CILCORP Subsidiaries has
  received any written communication from any person or
  Governmental Authority that alleges that CILCORP or any of the
  CILCORP Subsidiaries or, to the knowledge of CILCORP, the
  CILCORP Joint Ventures is not in such compliance with
  applicable Environmental Laws.  Except as set forth in Section
  4.11(b)(ii) of the CILCORP Disclosure Schedule, to the
  knowledge of CILCORP, compliance with all applicable
  Environmental Laws will not require CILCORP or any CILCORP
  Subsidiary or, to the knowledge of CILCORP, any CILCORP Joint
  Venture to incur material expenditures beyond that currently
  budgeted in the five CILCORP fiscal years beginning with
  January 1, 1998 (as disclosed to AES prior to the date of this
  Agreement), including but not limited to the costs of CILCORP
  and CILCORP Subsidiary and CILCORP Joint Venture pollution
  control equipment required or reasonably contemplated to be
  required in the future.
  
                (c)  Environmental Permits.  Except as set forth
  in Section 4.11(c) of the CILCORP Disclosure Schedule, CILCORP
  and each of the CILCORP Subsidiaries and, to the knowledge of
  CILCORP, the CILCORP Joint Ventures, have obtained or have
  applied for all permits, licenses, registrations, consents,
  and other governmental authorizations required under any
  Environmental Law ("Environmental Permits") necessary for the
  construction of its facilities or the conduct of its
  operations except where the failure to so obtain would not
  have a CILCORP Material Adverse Effect, and all such
  Environmental Permits are in good standing or, where
  applicable, a renewal application has been timely filed and is
  pending agency approval, and CILCORP and the CILCORP
  Subsidiaries and, to the knowledge of CILCORP, the CILCORP
  Joint Ventures are in compliance with all terms and conditions
  of all Environmental Permits necessary for the construction of
  its facilities or the conduct of its operations, except where
  the failure to so comply, in the aggregate, would not have a
  CILCORP Material Adverse Effect.
  
                (d)  Environmental Claims.  Except as set forth
  in Section 4.11(d) of the CILCORP Disclosure Schedule, there
  is no Environmental Claim pending (or, to the knowledge of
  CILCORP, threatened) (A) against CILCORP or any of the CILCORP
  Subsidiaries or, to the knowledge of CILCORP, any of the
  CILCORP Joint Ventures, (B) to the knowledge of CILCORP,
  against any person or entity whose liability for any
  Environmental Claim CILCORP, any of the CILCORP Subsidiaries
  or CILCORP Joint Ventures has or may have retained or assumed
  either contractually or by operation of law, or (C) against
  any real or personal property or operations which CILCORP or
  any of the CILCORP Subsidiaries or, to the knowledge of
  CILCORP, any of the CILCORP Joint Ventures owns, leases or
  manages, in whole or in part, which, if adversely determined,
  would have, individually or in the aggregate, a CILCORP
  Material Adverse Effect.
  
                (e)  Releases.  Except as set forth in Section
  4.11(e) of the CILCORP Disclosure Schedule, CILCORP has no
  knowledge of any Releases of any Hazardous Material that would
  be reasonably likely to form the basis of any Environmental
  Claim against CILCORP or any of the CILCORP Subsidiaries or
  the CILCORP Joint Ventures, or against any person or entity
  whose liability for any Environmental Claim CILCORP or any of
  the CILCORP Subsidiaries or the CILCORP Joint Ventures has or
  may have retained or assumed either contractually or by
  operation of law except for any Environmental Claim which
  would not have, individually or in the aggregate, a CILCORP
  Material Adverse Effect.
  
                (f)  Predecessors. Except as set forth in
  Section 4.11(f) of the CILCORP Disclosure Schedule, CILCORP
  has no knowledge, with respect to any predecessor of CILCORP
  or any of the CILCORP Subsidiaries or the CILCORP Joint
  Ventures, of any Environmental Claim pending or threatened, or
  of any Release of Hazardous Materials that would be reasonably
  likely to form the basis of any Environmental Claim, which, if
  determined adversely, could reasonably be expected to require
  payments of $500,000 or more or which could reasonably be
  expected to have a CILCORP Material Adverse Effect.
  
                (g)  Disclosure.  CILCORP has disclosed in
  writing to AES all material facts which CILCORP reasonably
  believes could have a CILCORP Material Adverse Effect arising
  from (i) the cost of CILCORP pollution control equipment
  (including, without limitation, upgrades and other
  modifications to existing equipment) currently required or
  reasonably contemplated to be required in the future, (ii)
  current remediation costs or costs to CILCORP or any of the
  CILCORP Subsidiaries for remediation reasonably contemplated
  to be required in the future or (iii) any other environmental
  matter affecting CILCORP or any of the CILCORP Subsidiaries.
  
                (h)  Cost Estimates.  To CILCORP's knowledge, no
  environmental matter set forth in the CILCORP SEC Reports or
  the CILCORP Disclosure Schedule could reasonably be expected
  to exceed the cost estimates provided in the CILCORP SEC
  Reports by an amount that individually or in the aggregate
  could reasonably be expected to have a CILCORP Material
  Adverse Effect.
  
                (i)  Orders; Environmental Indemnification.
  Except as set forth in Section 4.11(i) of the CILCORP
  Disclosure Schedule, neither CILCORP nor any of the CILCORP
  Subsidiaries nor, to the knowledge of CILCORP, any CILCORP
  Joint Ventures, are or have been subject to any administrative
  or judicial orders relating to Environmental Laws or Hazardous
  Materials, including, but not limited to, Hazardous Materials
  that have been Released at locations that are not currently
  owned or operated by CILCORP, the CILCORP Subsidiaries or any
  CILCORP Joint Ventures, except for such orders where CILCORP
  or any CILCORP Subsidiary or any CILCORP Joint Ventures
  completed all obligations under said orders (and where there
  are no outstanding potential obligations or penalties that
  could arise from said orders) more than five years prior to
  the date of this Agreement.  Except as set forth in Section
  4.11(i) of the CILCORP Disclosure Schedule, neither CILCORP
  nor any of the CILCORP Subsidiaries nor, to the knowledge of
  CILCORP, any CILCORP Joint Ventures, have entered into any
  agreements with any non-governmental persons requiring
  CILCORP, any CILCORP Subsidiary or, to the knowledge of
  CILCORP, any CILCORP Joint Venture to indemnify, reimburse or
  provide contribution to such other person for any matter
  related to Environmental Laws, Hazardous Materials, or the
  environment, except for such matters that have been fully
  resolved and where CILCORP, any CILCORP Subsidiary or any
  CILCORP Joint Venture has no further monetary or non-monetary
  obligation.
  
                (j)  NOx Emissions.  Section 4.11(j) of the
  CILCORP Disclosure Schedule is a true and correct description
  of (i) CILCORP current plan to comply with current or
  reasonably anticipated requirements relating to the control of
  atmospheric emissions of oxides of nitrogen (NOx), including,
  but not limited to, costs and expenses related to compliance
  with a rule issued by the EPA, published in the Federal
  Register on October 27, 1998, that requires 22 States and the
  District of Columbia to submit State implementation plan
  revisions to prohibit specified amounts of NOx ("NOx SIP
  Call"), and compliance with state statutes, regulations and
  policies promulgated or issued to implement the NOx SIP Call,
  and (ii) CILCORP best judgment as to the estimated capital
  costs and operating costs associated with such plan.
  
           Section 4.12   Regulation as a Utility.  CILCO is
  regulated as a public utility by the FERC and in the State of
  Illinois and in no other state. Except as set forth in the
  preceding sentence or Section 4.12 of the CILCORP Disclosure
  Schedule, neither CILCORP nor any "subsidiary company" or
  "affiliate" (as each such term is defined in PUHCA) of CILCORP
  (other than CILCO) is subject to regulation as a public
  utility or public service company (or similar designation) by
  the FERC or any municipality, locality, state in the United
  States or any foreign country.
  
           Section 4.13   Vote Required.  The approval of the
  Merger by the affirmative vote of two-thirds of the votes
  entitled to be cast by holders of CILCORP Common Stock (the
  "CILCORP Stockholders' Approval") is the only vote of the
  holders of any class or series of the capital stock of CILCORP
  or any of the CILCORP Subsidiaries required to approve this
  Agreement, the Merger, the other transactions contemplated
  hereby and the Second Merger.
  
           Section 4.14   Insurance.  Except as set forth in
  Section 4.14 of the CILCORP Disclosure Schedule, CILCORP and
  each of the CILCORP Subsidiaries is, and has been continuously
  since January 1, 1996, insured with financially responsible
  insurers in such amounts and against such risks and losses as
  are customary for companies conducting the business as
  conducted by CILCORP and the CILCORP Subsidiaries during such
  time period.  Neither CILCORP nor any of the CILCORP
  Subsidiaries is in default under or has received any notice of
  cancellation or termination with respect to any material
  insurance policy of CILCORP or any of the CILCORP
  Subsidiaries.  The insurance policies of CILCORP and each of
  the CILCORP Subsidiaries are valid and enforceable policies
  and will remain in effect following the Merger and the Second
  Merger.
  
           Section 4.15   Opinion of Financial Advisor.  The
  Board of Directors of CILCORP has received the opinion of
  Salomon Smith Barney ("Salomon"), dated the date of this
  Agreement, to the effect that, as of the date thereof, the Per
  Share Amount to be received by the holders of CILCORP Common
  Stock in the Merger is fair from a financial point of view to
  the holders of CILCORP Common Stock.
  
           Section 4.16   Brokers.  No broker, finder or
  investment banker (other than Salomon) is entitled to any
  brokerage, finder's or other fee or commission in connection
  with the transactions contemplated by this Agreement based
  upon arrangements made by or on behalf of CILCORP or any
  CILCORP Subsidiary. CILCORP has heretofore furnished to AES a
  complete and correct copy of all agreements between CILCORP
  and Salomon, pursuant to which such firm would be entitled to
  any payment relating to the Merger.
  
           Section 4.17   Non-Applicability of Certain
  Provisions of Illinois Act.  None of the business combination
  provisions of Section 5/7.85 and Section 5/11.75 of the
  Illinois Act or any similar provisions of the Illinois Act,
  the Articles of Incorporation or By-Laws of CILCORP are
  applicable to the transactions contemplated by this Agreement
  because such provisions do not apply by their terms or because
  any required approvals of the Board of Directors of CILCORP
  have been obtained.
  
           Section 4.18   CILCORP Rights Agreement.  Prior to
  the date of this Agreement, CILCORP has delivered to AES and
  its counsel a true and complete copy of the Rights Agreement,
  dated as of October 29, 1996, between Continental Stock
  Transfer and Trust Company and CILCORP (the "CILCORP Rights
  Agreement"), in effect as of the date hereof.  As promptly as
  practicable on or after the date hereof, but in no event later
  than the date of delivery of the CILCORP Certificate, CILCORP
  will amend the CILCORP Rights Agreement, as necessary (the
  "Rights Amendment"), (i) to prevent the Merger, the other
  transactions contemplated hereby and the Second Merger from
  resulting in the distribution of separate rights certificates
  or the occurrence of a Distribution Date (as defined in the
  CILCORP Rights Agreement) or being deemed a Triggering Event
  (as defined in the CILCORP Rights Agreement) and (ii) to
  provide that neither AES nor any AES Subsidiary shall be
  deemed to be an Acquiring Person (as defined in the CILCORP
  Rights Agreement) by reason of the Merger, the other
  transactions contemplated by this Agreement and the Second
  Merger.  CILCORP represents that the Rights Amendment will be
  sufficient to render the Preferred Stock Purchase Rights (the
  "Rights") inoperative with respect to any acquisition of
  Shares by AES, any AES Subsidiary or any of their affiliates
  pursuant to this Agreement.  CILCORP represents that as a
  result of the Rights Amendment, the Rights will not be
  exercisable upon or at any time after the Merger or the Second
  Merger by reason of the transactions contemplated hereby.
  
           Section 4.19   Year 2000 Compliance. The computer
  software operated by CILCORP and its Subsidiaries which is
  used in the conduct of their business is capable of providing
  or being adapted to provide uninterrupted millennium
  functionality to record, store, process and present calendar
  dates falling on or after January 1, 2000 in substantially the
  same manner and with the same functionality as such software
  records, stores, processes and presents such calendar dates
  falling on or before December 31, 1999.  CILCORP reasonably
  believes as of the date hereof that the remaining cost of
  adaptions referred to in the foregoing sentence will not
  exceed $22.0 million, and all such costs have been included in
  CILCORP's budget for capital expenditures set forth in Section
  6.1(k) of the CILCORP Disclosure Schedule.
  
           Section 4.20   Title to Real Property.  Except as set
  forth in Section 4.20 of the CILCORP Disclosure Schedule or
  except as is not reasonably likely to result in a CILCORP
  Material Adverse Effect, CILCORP and each CILCORP Subsidiary:
  (i) owns and has good, valid and marketable title in fee
  simple to the real property owned by such party, free and
  clear of Liens, except for (A) minor imperfections of title,
  easements and rights of way, none of which, individually or in
  the aggregate, materially detracts from the value of or
  impairs the use of the affected property or impairs the
  operations of CILCORP or any CILCORP Subsidiary and (B) Liens
  for current Taxes not yet due and payable ((A) and (B) are
  collectively referred to as "Permitted CILCORP Liens"); (ii)
  is in peaceful and undisturbed possession of the space and/or
  estate under each lease under which it is a tenant, and there
  are no material defaults by it as tenant thereunder; and (iii)
  has good and valid rights of ingress and egress to and from
  all the real property owned or leased by such party from and
  to the public street systems for all usual street, road and
  utility purposes.  The failure to hold any easements or rights
  of way will not have a CILCORP Material Adverse Effect.
  
           Section 4.21   Assets Other than Real Property
  Interests.  CILCORP or a CILCORP Subsidiary has good and valid
  title to all material assets reflected on the most recent
  balance sheet included in the CILCORP SEC Reports (the
  "Balance Sheet") or  thereafter acquired, except those sold or
  otherwise disposed of for fair value since the date of the
  Balance Sheet in the ordinary course of business consistent
  with past practice and not in violation of this Agreement, in
  each case free and clear of all mortgages, liens, security
  interests or encumbrances of any kind except (i) mechanics',
  carriers', workmen's, repairmen's or other like liens arising
  or incurred in the ordinary course of business, liens arising
  under original purchase price conditional sales contracts and
  equipment leases with third parties entered into in the
  ordinary course of business and that may thereafter be paid
  without penalty, (ii) mortgages, liens, security interests and
  encumbrances which secure debt that is reflected as a
  liability on the Balance Sheet and the existence of which is
  indicated in the notes thereto and (iii) other imperfections
  of title or encumbrances, if any, which do not, individually
  or in the aggregate, materially impair the continued use and
  operation of the assets to which they relate in the business
  of CILCORP and each of the CILCORP Subsidiaries as presently
  conducted.  All the material tangible personal property of
  CILCORP and the CILCORP Subsidiaries has been maintained in
  all material respects in accordance with the past practice of
  CILCORP and the CILCORP Subsidiaries and generally accepted
  industry practice.  Each item of material tangible personal
  property of CILCORP and the CILCORP Subsidiaries is in all
  material respects in good working order and is adequate and
  sufficient for CILCORP' intended purposes, ordinary wear and
  tear excepted.  All leased personal property of CILCORP and
  its subsidiaries is in all material respects in the condition
  required of such property by the terms of the lease applicable
  thereto during the term of the lease and upon the expiration
  thereof.
  
           Section 4.22   Intellectual Property.  CILCORP and
  each of the CILCORP Subsidiaries own, or possess licenses or
  other valid rights to use, all patents, patent rights,
  trademarks, trademark rights, trade names, trade name rights,
  copyrights, service marks, service mark rights, trade secrets,
  applications to register, and registrations for, the foregoing
  trademarks, service marks, know-how and other proprietary
  rights and information (collectively, "Intellectual Property")
  necessary in connection with the business of CILCORP and the
  CILCORP Subsidiaries as currently conducted, except where the
  failure to possess such rights or licenses or valid rights to
  use would not have a CILCORP Material Adverse Effect, and (i)
  the conduct of the business of CILCORP and each of the CILCORP
  Subsidiaries as currently conducted does not infringe upon any
  Intellectual Property of any third party except where such
  infringement would not result in a CILCORP Material Adverse
  Effect and (ii) no person is infringing upon any Intellectual
  Property of CILCORP or any CILCORP Subsidiary except where
  such infringement would not result in a CILCORP Material
  Adverse Effect.  The execution and delivery of this Agreement
  and the consummation of the Merger, the other transactions
  contemplated hereby and the Second Merger will not result in
  the loss of, or any encumbrance on, the rights of CILCORP or
  any CILCORP Subsidiary with respect to the Intellectual
  Property owned or used by them, except where such loss or
  encumbrance would not have a CILCORP Material Adverse Effect.
  
           Section 4.23   Transactions with Affiliates.  Except
  as set forth in Section 4.23 of the CILCORP Disclosure
  Schedule or in the CILCORP SEC Reports, there is no agreement,
  contract or other arrangement between CILCORP and any CILCORP
  Subsidiary, on the one hand, and any affiliate (other than
  CILCORP or a CILCORP Subsidiary), on the other hand, that will
  continue in effect subsequent to the Closing Date.  After the
  Closing Date no affiliate of CILCORP or any CILCORP Subsidiary
  (other than CILCORP or any CILCORP Subsidiary) will have any
  material interest in any property (real or personal, tangible
  or intangible) or contract used in or pertaining to the
  business of CILCORP or any CILCORP Subsidiary.  No affiliate
  of CILCORP or any CILCORP Subsidiary (other than CILCORP or
  any CILCORP Subsidiary) has any direct or indirect ownership
  interest in any person (other than the ownership of 5% or less
  of the stock of any person held as a passive investment) in
  which CILCORP or any CILCORP Subsidiary has any direct or
  indirect ownership interest or with which CILCORP or any
  CILCORP Subsidiary competes or has a business relationship.
  
           Section 4.24   Discontinued Business.  Section
  4.24(i) of the CILCORP Disclosure Schedule contains a true and
  complete list of each CILCORP Subsidiary which has ceased
  operations or discontinued any business (the "Discontinued
  Business") since January 1, 1997.  Except for liabilities,
  contingent or otherwise, disclosed in Section 4.24(ii) of the
  CILCORP Disclosure Schedule, neither CILCORP nor any CILCORP
  Subsidiary has any liabilities or obligations, contingent or
  otherwise, with respect to a Discontinued Business and no
  creditor of any Discontinued Business has any recourse against
  CILCORP or any CILCORP Subsidiary.
  
           Section 4.25   Captive Insurance Business.  National
  Professional Casualty Company is licensed as a pure captive
  insurance company within the meaning of Section 6001 of the
  Vermont Insurance Laws, and has all insurance licenses,
  permits and authorizations required to operate its business as
  currently conducted.  At no time has National Professional
  Casualty Company insured any risks other than those of QST
  Environmental Inc. and its Subsidiaries.  The loss and loss
  adjustment expense reserves reflected on National Professional
  Casualty Company's most recently filed statutory statement
  were established in accordance with generally accepted
  actuarial standards consistently applied and are adequate to
  meet all liabilities on insurance policies issued by National
  Professional Casualty Company.  CILCORP has previously
  delivered to AES the most recent market conduct and financial
  examinations report of National Professional Casualty Company
  issued by any insurance regulatory authority, and all material
  deficiencies or violations in such reports have been resolved
  to the satisfaction of the insurance regulatory authorities.
  Except as set forth in Section 4.25 of the CILCORP Disclosure
  Schedule, there are no pending market conduct examinations or
  inquiries by any insurance regulatory authority with respect
  to National Professional Casualty Company.
  
           Section 4.26   Contractual Obligations.  Section 4.26
  of the CILCORP Disclosure Schedule sets forth a true and
  complete list of all contractual commitments or other
  contractual obligations of CILCORP and the CILCORP
  Subsidiaries to make investments or purchase an equity
  interest in,  make contributions to, or otherwise fund the
  operations, expenses or capital of, any person.  The execution
  and delivery of this Agreement by CILCORP do not, and the
  consummation of the Merger and the other transactions
  contemplated hereby and if such were consummated, the Second
  Merger, will not result in any obligation on the part of
  CILCORP or any CILCORP Subsidiaries to pay money to, guarantee
  the performance or obligations of, or cause AES to guarantee
  the performance or obligations of, any person, including in
  connection with obtaining the CILCORP Required Consents and
  the CILCORP Second Merger Required Consents, under any note,
  bond, mortgage, indenture or deed of trust or any material
  contract, lease or other agreement of any kind to which
  CILCORP or any of the CILCORP Subsidiaries or the CILCORP
  Joint Ventures  is a party or by which any of them or any of
  their respective properties or assets may be bound.
  
           Section 4.27   Disclosure.  CILCORP has not failed to
  disclose to AES any facts known to CILCORP or which CILCORP
  could reasonably be expected to know pertaining to CILCORP,
  any CILCORP Subsidiary, any CILCORP Joint Venture, or its or
  their business or operations that may materially and adversely
  affect the business, assets, operations, or prospects of
  CILCORP, any CILCORP Subsidiary or any CILCORP Joint Venture
  taken as a whole.
  
  
                            ARTICLE V
  
      REPRESENTATIONS AND WARRANTIES OF AES AND MERGER SUB
  
       AES and Merger Sub hereby represent and warrant to
  CILCORP as follows:
  
           Section 5.1    Organization and Qualification.  Each
  of AES and Merger Sub is a corporation duly organized, validly
  existing and in good standing under the laws of its
  jurisdiction of incorporation or organization, has all
  requisite power and authority and has been duly authorized by
  all necessary approvals and orders to own, lease and operate
  its assets and properties and to carry on its business as it
  is now being conducted and is duly qualified and in good
  standing to do business in each jurisdiction in which the
  nature of its business or the ownership or leasing of its
  assets and properties makes such qualification necessary,
  other than in such jurisdictions where the failure to so
  qualify and be in good standing, when taken together with all
  other such failures, would not have a material adverse effect
  on the business, operations, properties, assets, condition
  (financial or other), prospects or the results of operations
  of AES and its subsidiaries taken as a whole or on the
  consummation of the transactions contemplated by this
  Agreement (any such material adverse effect, an "AES Material
  Adverse Effect").
  
           Section 5.2    Authority; Non-Contravention;
  Statutory Approvals.
  
                (a)  Authority.  AES and Merger Sub have all
  requisite power and authority to enter into this Agreement
  and, subject to the receipt of the AES Required Statutory
  Approvals (as defined in Section 5.2(c) hereof), to consummate
  the transactions contemplated hereby.  The execution and
  delivery of this Agreement and the consummation by AES and
  Merger Sub of the Merger and the other transactions
  contemplated hereby have been duly authorized by all necessary
  corporate action on the part of AES and Merger Sub.  This
  Agreement has been duly and validly executed and delivered by
  AES and Merger Sub, and, assuming the due authorization,
  execution and delivery hereof by CILCORP, this Agreement
  constitutes the valid and binding obligation of each of AES
  and Merger Sub, enforceable against each of them in accordance
  with its terms, except as enforceability may be limited by
  bankruptcy, insolvency, reorganization, moratorium or other
  similar laws affecting the enforcement of creditors' rights
  generally and by general equitable principles (regardless of
  whether such enforceability is considered in a proceeding in
  equity or at law).
  
                (b)  Non-Contravention.  The execution and
  delivery of this Agreement by AES and Merger Sub do not, and
  the consummation of the Merger and the other transactions
  contemplated hereby will not, result in a Violation pursuant
  to any provisions of (i) the Certificate or Articles of
  Incorporation, By-Laws or similar governing documents of AES
  or Merger Sub, (ii) subject to obtaining the AES Required
  Statutory Approvals (as defined below), any statute, law,
  ordinance, rule, regulation, judgment, decree, order,
  injunction, writ, permit or license of any Governmental
  Authority (as defined in Section 4.4(b) hereof) applicable to
  AES or Merger Sub or any of their respective properties or
  assets or (iii) subject to obtaining the third-party consents
  (the "AES Required Consents") set forth in Section 5.2(b) of
  the disclosure schedule delivered by AES to CILCORP concurrent
  with the execution of this Agreement (the "AES Disclosure
  Schedule"), any material note, bond, mortgage, indenture, deed
  of trust, license, franchise, permit, concession, contract,
  lease or other instrument, obligation or agreement of any kind
  to which AES or Merger Sub is a party or by which it or any of
  its properties or assets may be bound or affected, excluding
  from the foregoing clauses (ii) and (iii) such Violations
  which would not, in the aggregate, have an AES Material
  Adverse Effect.
  
                (c)  Statutory Approvals.  Except as described
  in Section 5.2(c) of the AES Disclosure Schedule, no
  declaration, filing or registration with, or notice to or
  authorization, consent or approval of, any Governmental
  Authority is necessary for the execution and delivery of this
  Agreement by AES and Merger Sub or the consummation by AES and
  Merger Sub of the Merger and the other transactions
  contemplated hereby (the "AES Required Statutory Approvals"),
  other than such AES Required Statutory Approvals the failure
  of which to be obtained or made would not prevent the consumma
  tion by AES of the Merger and the other transactions
  contemplated hereby, it being understood that references in
  this Agreement to "obtaining" such AES Required Statutory
  Approvals shall mean making such declarations, filings or
  registrations; giving such notices; obtaining such
  authorizations, consents or approvals; and having such waiting
  periods expire as are necessary to avoid a violation of law.
  
           Section 5.3    Compliance.  Except as set forth in
  Section 5.3 of the AES Disclosure Schedule or as disclosed in
  any report, schedule, registration statement and definitive
  proxy statement and all amendments thereto filed with the SEC
  by AES or Merger Sub (or their predecessors) pursuant to the
  requirements of the Securities Act or Exchange Act since
  January 1, 1996 and prior to the date hereof (as such
  documents have since the time of their filing been amended,
  the "AES SEC Reports"), true and complete copies of which have
  been provided to CILCORP concurrent with the execution of this
  Agreement, neither AES nor Merger Sub is in violation of, is,
  to the knowledge of AES, under investigation with respect to
  any violation of, or has been given notice or been charged
  with any violation of, any law, statute, order, rule,
  regulation, ordinance or judgment (including, without
  limitation, any applicable environmental law, ordinance or
  regulation) of any Governmental Authority, except for
  violations which individually or in the aggregate do not, and
  insofar as reasonably can be foreseen will not, have an AES
  Material Adverse Effect.  Except as set forth in Section 5.3
  of the AES Disclosure Schedule, AES and Merger Sub have all
  permits, licenses, franchises and other governmental
  authorizations, consents, approvals and exemptions necessary
  to conduct their businesses as presently conducted which are
  material to the operation of the businesses of AES and Merger
  Sub, except for such permits, licenses, franchises and other
  governmental authorizations, consents, approvals and
  exemptions the failure of which to have would not result in an
  AES Material Adverse Effect.  Except as set forth in Section
  5.3 of the AES Disclosure Schedule, each of AES and Merger Sub
  is not in breach or violation of or in default in the
  performance or observance of any term or provision of, and no
  event has occurred which, with lapse of time or action by a
  third party, could result in a default by AES or Merger Sub
  under (i) its Articles of Incorporation, By-Laws or other
  organizational document or (ii) any material contract,
  commitment, agreement, indenture, mortgage, loan agreement,
  note, lease, bond, license, approval or other instrument to
  which it is a party or by which AES or Merger Sub is bound or
  to which any of its property is subject, except in the case of
  clause (ii) above, for violations, breaches or defaults which
  individually or in the aggregate do not, and insofar as
  reasonably can be foreseen will not, have an AES Material
  Adverse Effect.
  
           Section 5.4    Reports and Financial Statements.  The
  filings required to be made by AES and Merger Sub under the
  Securities Act, the Exchange Act, the Public Utility
  Regulatory Policies Act of 1978 ("PURPA"), PUHCA and
  applicable state, municipal, local and other laws, including
  all forms, statements, reports, agreements (oral or written)
  and all documents, exhibits, amendments and supplements
  appertaining thereto, have been filed with the SEC or the
  FERC, or other appropriate Governmental Authorities, as the
  case may be, and complied, as of their respective dates, in
  all material respects with all applicable requirements of the
  appropriate statutes and the rules and regulations thereunder.
  As of their respective dates, the AES SEC Reports did not
  contain any untrue statement of a material fact or omit to
  state a material fact required to be stated therein or
  necessary to make the statements therein, in light of the
  circumstances under which they were made, not misleading.  The
  audited consolidated financial statements and unaudited
  interim financial statements of AES included in the AES SEC
  Reports (collectively, the "AES Financial Statements") have
  been prepared in accordance with GAAP (except as may be
  indicated therein or in the notes thereto) and fairly present
  the financial position of AES, as of the dates thereof and the
  results of their operations and cash flows for the periods
  then ended, subject, in the case of the unaudited interim
  financial statements, to normal, recurring audit adjustments.
  True, accurate and complete copies of the Articles of
  Incorporation and By-Laws of AES, as in effect on the date of
  this Agreement, are included (or incorporated by reference) in
  the AES SEC Reports.
  
           Section 5.5    Proxy Statement Information.  None of
  the information supplied in writing by AES, Merger Sub or any
  AES Subsidiary for inclusion in the Proxy Statement (as
  defined in Section 7.2(a) hereof), at the dates mailed to
  stockholders of CILCORP and at the time of the meeting of such
  stockholders to be held in connection with the Merger and the
  other transactions contemplated hereby, will contain any
  untrue statement of a material fact or omit to state any
  material fact required to be stated therein or necessary in
  order to make the statements therein, in light of the
  circumstances under which they are made, not misleading.
  
           Section 5.6    Financing.  As of the date of this
  Agreement and assuming that CILCORP delivers the CILCORP
  Certificate, AES believes in its reasonable good faith
  judgment that it will be able to obtain the funds, through
  financing or otherwise, in an amount sufficient to pay the
  Aggregate Consideration Amount upon consummation of the
  Merger.
  
           Section 5.7     Regulatory Status.
  
                (a)  Except as set forth in Section 5.7 of the
  AES Disclosure Schedule, as of the date of this Agreement,
  neither AES nor any "subsidiary company" or "affiliate" (as
  such terms are defined in PUHCA) of AES is subject to
  regulation as a public utility or public service company (or
  similar designation) by the FERC or any municipality, locality
  or state in the United States.
  
                (b)  As soon as reasonably practicable after the
  date hereof, AES will not be a "holding company" (as such term
  is defined in PUHCA) nor will it be a "subsidiary company" of
  a "holding company" or an "affiliate" of any "public utility
  company" (as such terms are defined in PUHCA), and therefore,
  prior approval of the SEC pursuant to Section 9(a)(2) of PUHCA
  will not be required for consummation of the Merger and the
  other transactions consummated hereby.
  
           Section 5.8    Regulatory Approval.  As of the date
  of this Agreement, AES believes in its reasonable good faith
  judgment that it will be able to obtain the SEC Exemption
  Order.
  
  
                           ARTICLE VI
  
    CONDUCT OF BUSINESS PENDING THE MERGER; COVENANTS OF THE
                             PARTIES
  
           Section 6.1    Conduct of Business by CILCORP Pending
  the Merger.  CILCORP covenants and agrees, as to itself and
  each of the CILCORP Subsidiaries, that after the date of this
  Agreement and prior to the Effective Time or earlier
  termination of this Agreement, except as expressly
  contemplated or permitted in this Agreement, or to the extent
  AES shall have otherwise consented in writing, which decision
  regarding consent shall be made as soon as reasonably
  practicable and which consent shall not be unreasonably
  withheld:
  
                (a)  Ordinary Course of Business.  CILCORP
  shall, and shall cause the CILCORP Subsidiaries to, carry on
  their respective businesses in the usual, regular and ordinary
  course in substantially the same manner as heretofore
  conducted and use all commercially reasonable efforts to
  preserve intact their present business organizations and
  goodwill, preserve the goodwill and relationships with
  customers, suppliers and others having business dealings with
  them, including regulators, and, subject to prudent management
  of workforce needs and ongoing or planned programs relating to
  downsizing, re-engineering and similar matters, keep available
  the services of their present officers and employees to the
  end that their goodwill and ongoing businesses shall not be
  impaired in any material respect at the Effective Time.
  
                (b)  Dividends.  CILCORP shall not, nor shall
  CILCORP permit any of the CILCORP Subsidiaries to, (i) declare
  or pay any dividends on or make other distributions in respect
  of any of their capital stock other than (A) to CILCORP or its
  wholly-owned Subsidiaries, (B) dividends required to be paid
  on any CILCO Preferred Stock, CILCO Class A Preferred Stock or
  CILCO Preference Stock in accordance with the terms thereof,
  (C) regular quarterly dividends of $.615 on CILCORP Common
  Stock with respect to the fiscal quarters ending prior to the
  Effective Date, with usual record and payment dates not in
  excess of the average quarterly dividend for the four
  quarterly dividend payments immediately preceding the date
  hereof with respect thereto, and (D) a special dividend on
  CILCORP Common Stock with respect to the quarter in which the
  Effective Time occurs with a record date on or prior to the
  Effective Time, which does not exceed an amount equal to $.615
  multiplied by a fraction, the numerator of which is the number
  of days in such quarter prior to the Effective Time, and the
  denominator of which is the total number of days in such
  fiscal quarter; (ii) split, combine or reclassify any of their
  capital stock or issue or authorize or propose the issuance of
  any other securities in respect of, in lieu of, or in
  substitution for, shares of their capital stock; or (iii)
  redeem, repurchase or otherwise acquire any shares of their
  capital stock, other than redemptions, purchases or
  acquisitions required by the respective terms of any series of
  CILCO Preferred Stock, CILCO Class A Preferred Stock or CILCO
  Preference Stock.
  
                (c)  Issuance of Securities.  Except as
  described in Section 6.1(c) of the CILCORP Disclosure
  Schedule, CILCORP shall not, nor shall CILCORP permit any of
  the CILCORP Subsidiaries to, issue, agree to issue, deliver,
  sell, award, pledge, dispose of or otherwise encumber or
  authorize or propose the issuance, delivery, sale, award,
  pledge, grant of a security interest, disposal or other
  encumbrance of, any shares of their capital stock of any class
  or any securities convertible into or exchangeable for, or any
  rights, warrants or options to acquire, any such shares or
  convertible or exchangeable securities, other than (i)
  issuances by a wholly owned Subsidiary of its capital stock to
  its direct or indirect parent and (ii) issuances of shares of
  CILCORP Common Stock after the date of this Agreement pursuant
  to CILCORP Options existing as of the date hereof, as
  identified in Section 4.10(a) of the CILCORP Disclosure
  Schedule.
  
                (d)  Charter Documents.  CILCORP shall not, nor
  shall CILCORP permit any CILCORP Subsidiary to, amend or
  propose to amend the Articles of Incorporation or By-Laws of
  CILCORP or such comparable organizational documents of any
  CILCORP Subsidiary.
  
                (e)  No Acquisitions.  Except as provided in
  Section 6.1(aa) hereof, CILCORP shall not, nor shall CILCORP
  permit any CILCORP Subsidiary to: (i) acquire, or publicly
  propose to acquire, or agree to acquire, by merger or
  consolidation with, or by purchase or otherwise, an equity
  interest in or a substantial portion of the assets of, any
  business or corporation, partnership, association or other
  business organization or division thereof, (ii) otherwise
  acquire or agree to acquire a material amount of assets, other
  than fuel used for the production of electricity and limestone
  used for its SO2 scrubber, or natural gas for send-out or
  storage or (iii) alter (through merger, liquidation,
  reorganization, restructuring or in any other fashion) the
  corporate structures or ownership of CILCORP or any of the
  CILCORP Subsidiaries, other than the transfer of ownership of
  QST Environmental Inc. from an indirect CILCORP Subsidiary to
  CILCORP.
  
                (f)  No Dispositions.  Except as disclosed in
  Section 6.1(f)(i) of the CILCORP Disclosure Schedule or with
  respect to CILCORP or the CILCORP Subsidiaries making
  dispositions in the ordinary course of business consistent
  with past practice at fair market value of less than $2
  million per transaction (not to exceed $10 million in the
  aggregate) in sales price and indebtedness assumed by the
  acquiring party and its affiliates, or making dispositions not
  in the ordinary course of business at fair market value of
  less than $50,000 per transaction (not to exceed $1 million in
  the aggregate) in sales price, CILCORP shall not, nor shall
  CILCORP permit any of the CILCORP Subsidiaries to, sell or
  dispose of any of their respective assets, provided, however,
  that no consent shall be required of AES for CILCORP or any
  Pacer Subsidiary to sell or dispose of (i) the stock or assets
  of QST Environmental Inc. and/or its Subsidiaries (or enter
  into any agreement for the sale or disposition of QST
  Environmental Inc. and/or its Subsidiaries) for a cash
  purchase price of at least $25 million, net of fees and
  expenses, if such sale or agreement includes as a term
  thereof, the release of CILCORP and the CILCORP Subsidiaries
  of all liabilities and obligations, contingent or otherwise,
  arising out of the operations of QST Environmental Inc. and
  its Subsidiaries prior to the date the sale is to be
  consummated, and whether or not known prior to the date of
  sale, and does not impose any liability on AES or any of the
  AES Subsidiaries with respect to such operations, or (ii) the
  assets listed in Section 6.1(f)(ii) of the CILCORP Disclosure
  Schedule if the purchase price for any such asset is less than
  $2,000,000 individually (not to exceed $5,000,000 in the
  aggregate) and if the price to be received for such asset
  after taking into account fees and expenses and on-going
  indemnification obligations and other post-closing liabilities
  is more than book value of such asset.
  
                (g)  Cooperation, Notification.  CILCORP shall
  (i) confer on a regular and frequent basis with one or more
  representatives of AES to discuss, subject to applicable law,
  material operational matters and the general status of
  CILCORP's ongoing operations, (ii) promptly notify AES of any
  significant changes in its business, properties, assets,
  condition (financial or other), results of operations or
  prospects, (iii) promptly notify AES of any sales of assets by
  CILCORP or any CILCORP Subsidiary in excess of $1 million and
  shall discuss with AES use of proceeds from such sales to the
  extent that such proceeds exceed $1 million, (iv) promptly
  advise AES of (A) any representation or warranty made by it
  contained in this Agreement that is qualified as to
  materiality becoming untrue or inaccurate as so qualified in
  any respect or any such representation or warranty that is not
  so qualified becoming untrue or inaccurate in any material
  respect, (B) the failure by it to comply in any material
  respect with or satisfy in any material respect any covenant,
  condition or agreement to be complied with or satisfied by it
  under this Agreement and (C) any change or event which,
  individually or in the aggregate, has had or would have a
  CILCORP Material Adverse Effect (provided, however, that no
  such notification shall affect the representations,
  warranties, covenants or agreements of the parties (or
  remedies with respect thereto) or the conditions to the
  obligations of the parties under this Agreement) and (v)
  promptly provide AES with copies of all filings made by
  CILCORP or any CILCORP Subsidiary with any state or federal
  court, administrative agency, commission or other Governmental
  Authority in connection with this Agreement and the
  transactions contemplated hereby.  AES shall designate one or
  more of its Representatives (as defined in Section 7.1
  hereof), by name, for purposes of this subsection (g), who
  will make themselves reasonably available by telephone,
  electronic mail and in person.
  
                (h)  Third-Party Consents.  CILCORP shall, and
  shall cause the CILCORP Subsidiaries to, use all reasonable
  best efforts to obtain all CILCORP Required Consents.  CILCORP
  shall promptly notify AES of any failure or prospective
  failure to obtain any such consents and shall provide copies
  of all CILCORP Required Consents obtained by CILCORP to AES.
  
                (i)  No Breach, Etc.  CILCORP shall not, and
  CILCORP shall not permit any CILCORP Subsidiary to, take any
  action that would or is reasonably likely to result in a
  material breach of any provision of this Agreement or in any
  of its representations and warranties set forth in this
  Agreement being untrue on and as of the Closing Date.
  
                (j)  Tax Matters.  CILCORP shall not, nor shall
  it permit any CILCORP Subsidiary to, (i) make or rescind any
  material express or deemed election relating to Taxes, (ii)
  except as set forth in Section 6.1(j)(ii) of the CILCORP
  Disclosure Schedule, settle or compromise any material claim,
  action, suit, litigation, proceeding, arbitration,
  investigation, audit or controversy relating to Taxes, (iii)
  except as set forth in Section 6.1(j)(iii) of the CILCORP
  Disclosure Schedule or as required by applicable law, change
  in any material respect any of its methods of reporting income
  or deductions for federal income Tax purposes from those
  employed in the preparation of its federal income Tax return
  for the taxable year ending December 31, 1997 or (iv) except
  as set forth in Section 6.1(j)(iv) of the CILCORP Disclosure
  Schedule, make any change in its method of accounting for
  Taxes as reflected on or used in preparing its Form 10-Q,
  dated as of November 10, 1998 (including any change in the
  amount of its reserve for contingent Tax liabilities).
  
                (k)  Capital Expenditures.  CILCORP shall, and
  CILCORP shall permit the CILCORP Subsidiaries to, make capital
  expenditures during any six-month fiscal period only up to and
  not in excess of 110% of the amount budgeted for such
  six-month fiscal period by CILCORP for capital expenditures
  and then only as set forth in Section 6.1(k) of the CILCORP
  Disclosure Schedule, except for unplanned capital expenditures
  due to emergency conditions, unanticipated catastrophic
  events, extreme weather, and unscheduled unit outages.
  
                (l)  Indebtedness.  CILCORP shall not, and
  CILCORP shall not permit any CILCORP Subsidiary to, incur or
  guarantee any indebtedness (including any debt borrowed or
  guaranteed or otherwise assumed including, without limitation,
  the issuance of debt securities or warrants or rights to
  acquire debt) or enter into any "keep well" or other agreement
  to maintain any financial statement condition of another
  person or entity or enter into any arrangement having the
  economic effect of any of the foregoing other than short-term
  indebtedness in the ordinary course of business consistent
  with past practice (such as the issuance of commercial paper,
  the use of credit facilities existing as of the date hereof or
  hedging activities undertaken in order to hedge a balance
  sheet asset or liability and not for speculative purposes);
  provided however in no event shall CILCORP and the CILCORP
  Subsidiaries, taken together, have outstanding at any time,
  $428 million in the aggregate of indebtedness, guarantees and
  keep-well obligations.
  
                (m)  Compensation, Benefits.  Except as set
  forth in Section 6.1(m) of the CILCORP Disclosure Schedule, as
  may be required by applicable law or as contemplated by this
  Agreement, CILCORP shall not, nor shall CILCORP permit any of
  the CILCORP Subsidiaries to, (i) enter into, adopt or amend or
  increase the amount or accelerate the payment or vesting of
  any benefit or amount payable under, any employee benefit plan
  or other contract, agreement, commitment, arrangement, plan,
  trust, fund or policy maintained by, contributed to or entered
  into by CILCORP or any of the CILCORP Subsidiaries (including,
  without limitation, the CILCORP Benefit Plans set forth in
  Section 4.10(a) of the CILCORP Disclosure Schedule) or
  increase, or enter into any contract, agreement, commitment or
  arrangement to increase in any manner, the compensation or
  fringe benefits, or otherwise to extend, expand or enhance the
  engagement, employment, compensation or any related rights, of
  any director, officer or other employee of CILCORP or any of
  the CILCORP Subsidiaries, except pursuant to binding legal
  commitments existing on the date of this Agreement and
  specifically identified in Section 4.10(a) of the CILCORP
  Disclosure Schedule.
  
                (n)  PUHCA.  CILCORP shall not, nor shall
  CILCORP permit any of the CILCORP Subsidiaries to, except as
  required or contemplated by this Agreement, engage in any
  activities which would cause a change in its status, or that
  of the CILCORP Subsidiaries, under PUHCA, or that would impair
  the ability of CILCORP or AES or any AES Subsidiary to claim
  any exemption under PUHCA or that would subject AES or any AES
  Subsidiary to regulation under PUHCA (other than under Section
  9(a)(2) or as an exempt holding company under PUHCA) following
  the Merger.
  
                (o)  Accounting.  CILCORP shall not, and CILCORP
  shall not permit any CILCORP Subsidiary to, make any changes
  in their accounting methods, except as required by law, rule,
  regulation or GAAP.
  
                (p)  Affiliate Transactions.  Subject to the
  other restrictions set forth in this Section 6.1, CILCORP
  shall not, and CILCORP shall not permit any CILCORP Subsidiary
  to, enter into any agreement or arrangement with any of their
  respective affiliates other than such agreements and
  arrangements as are entered into in the usual, ordinary and
  regular course of business and which have been negotiated on
  an arms-length basis and are no less favorable to CILCORP or a
  CILCORP Subsidiary than CILCORP or such CILCORP Subsidiary
  would have obtained from an unaffiliated third party, and
  provided that CILCORP shall have notified AES in writing prior
  to entering into any such affiliate transaction.
  
                (q)   Rate Matters.  CILCORP shall, and shall
  cause the CILCORP Subsidiaries to, discuss with AES any
  changes and proposed changes in its or the CILCORP
  Subsidiaries' rates or charges (including those with respect
  to fuel adjustment charges and purchased gas adjustments),
  standards of service or accounting from those in effect on the
  date hereof and consult with AES prior to making any filing
  (or any amendment thereto), or effecting any agreement,
  commitment, arrangement or consent, whether written or oral,
  formal or informal, with respect thereto, and except as
  provided in Section 6.1(q) of the CILCORP Disclosure Schedule,
  CILCORP shall not, and shall cause the CILCORP Subsidiaries
  not to, make any filing to change its rates on file with the
  FERC or any applicable state utility commission, except as may
  be required by applicable law, that would have a CILCORP
  Material Adverse Effect.
  
                (r)  Contracts.  CILCORP shall not, and CILCORP
  shall not permit any CILCORP Subsidiary to,  (i) except in the
  ordinary course of business consistent with past practice,
  enter into new contracts, modify, amend, terminate, renew or
  fail to use reasonable business efforts to renew any contract
  or agreement to which CILCORP or any CILCORP Subsidiary is a
  party, which is material to CILCORP and the CILCORP
  Subsidiaries taken as a whole and provided that the term of
  any new contract or any contract modification, amendment or
  renewal does not exceed twelve months, or waive, release or
  assign any material rights or claims therein, or (ii) enter
  into, modify, amend, or renew any contract or agreement
  outside the ordinary course of business or on a basis not
  consistent with past practice if the dollar value of such new
  contract or agreement, or existing contract or agreement as so
  amended, modified, or renewed, is or would be in excess of
  $2,000,000 (not to exceed $20,000,000 in the aggregate) or
  have an initial term (or a renewal or extension term) greater
  than twelve months.
  
                (s)  Insurance.  Section 6.1(s) of the CILCORP
  Disclosure Schedule is a true and correct list of the specific
  types of losses as to which CILCORP and the CILCORP
  Subsidiaries self-insure and the dollar amounts of each such
  type of coverage.  CILCORP shall, and shall cause each CILCORP
  Subsidiary to, maintain with financially responsible insurance
  companies insurance in such amounts and against such risks and
  losses as are customary for companies engaged in the electric
  and gas utility industry and employing such methods of
  generating electric power and fuel sources similar to the
  methods employed and fuels used by CILCORP or the CILCORP
  Subsidiaries, except that CILCORP may continue to self-insure
  for the type of losses and in the dollar amounts as provided
  in Section 6.1(s) of the CILCORP Disclosure Schedule.
  
                (t)  Permits.  CILCORP shall, and shall cause
  each CILCORP Subsidiary to, use reasonable best efforts to
  maintain in effect all existing governmental permits which are
  material to the operations of CILCORP or any of the CILCORP
  Subsidiaries.
  
                (u)  Discharge of Liabilities.  CILCORP shall
  not, and CILCORP shall not permit any CILCORP Subsidiary to,
  pay, discharge, settle, compromise or satisfy any claims,
  liabilities or obligations (absolute, accrued, asserted or
  unasserted, contingent or otherwise) material to CILCORP and
  the CILCORP Subsidiaries, taken as a whole, other than the
  payment, discharge, settlement, compromise or satisfaction, in
  the ordinary course of business consistent with past practice
  (which includes the payment of final and unappealable
  judgments) or in accordance with their terms, of liabilities
  reflected or reserved against in, or contemplated by, the most
  recent consolidated financial statements (or the notes thereto
  of the CILCORP SEC Reports filed prior to the date hereof), or
  incurred in the ordinary course of business consistent with
  past practice.
  
                (v)  Staffing.  Except as set forth in Sections
  6.1(v) and 6.1(aa) of the CILCORP Disclosure Schedule, CILCORP
  shall not, and shall not permit any CILCORP Subsidiary to,
  make any increase in staffing levels over those in effect on
  the date hereof.
  
                (w)  Tax-Exempt Status.  CILCORP shall not, nor
  shall CILCORP permit any CILCORP Subsidiary to, take any
  action that would likely jeopardize the qualification of
  CILCORP's outstanding revenue bonds which qualify as of the
  date hereof under Section 142(a) of the Code as "exempt
  facility bonds" or as tax-exempt industrial development bonds
  under Section 103(b)(4) of the Internal Revenue Code of 1954,
  as amended, prior to the Tax Reform Act of 1986.
  
                (x)  CILCORP Certificate.  As promptly as
  practicable after all conditions to Closing set forth in
  Section 8.1 hereof have been satisfied and the conditions set
  forth in Section 8.3(a), (b), (c) and (d) have been satisfied
  or waived, CILCORP shall deliver to AES the CILCORP
  Certificate (as defined in Section 6.2(d) hereof).
  
                (y)  QST Environmental Inc..  CILCORP shall, and
  shall cause the CILCORP Subsidiaries to, use commercially
  reasonable efforts to pursue the sale of QST Environmental
  Inc. prior to the Closing on the most favorable commercial
  terms available.
  
                (z)  WARN Act. CILCORP shall (i) notify AES of
  all employees of CILCORP and the CILCORP Subsidiaries who
  suffer an "employment loss" (as defined in the WARN Act)
  during the 90 day period prior to the Closing Date and (ii)
  provide, or cause the CILCORP Subsidiaries to provide, all
  written notices required by the WARN Act to all employees
  which AES designates.
  
                (aa)  New Lines of Business.  CILCORP shall not,
  nor shall CILCORP permit any CILCORP Subsidiary to, enter into
  a new line of business or make any change in the line of
  business in which it engages as of the date of this Agreement,
  except that CILCORP may establish a new wholly-owned
  subsidiary to take over the operation and maintenance of a
  steam plant, as disclosed on Section 6.1(aa) of the CILCORP
  Disclosure Schedule, but shall not in connection therewith
  hire any personnel, except as disclosed in Section 6.1(aa) of
  the CILCORP Disclosure Schedule.
  
                (bb)  Rights Agreement.  Except for the
  amendments contemplated by Section 4.18 hereof or amendments
  approved in writing by AES or any AES Subsidiary, CILCORP will
  not, following the date hereof, amend the CILCORP Rights Agree
  ment in any manner.  In addition, CILCORP covenants and agrees
  that it will not redeem the Rights unless such redemption is
  consented to in writing by AES prior to such redemption.
  
                (cc)  Illinois Commerce Commission
  Certification.  CILCORP shall use its commercially reasonable
  efforts to obtain from the Illinois Commerce Commission the
  certification addressed to the SEC pursuant to Section
  33(a)(2) of PUHCA in the form of Exhibit A hereto or in a form
  otherwise reasonably satisfactory to AES (the "Illinois
  Certification").
  
                (dd)  Hedging.  CILCORP shall not, and shall not
  permit any CILCORP Subsidiary to, buy or sell any energy
  futures or forward contracts or energy transportation futures
  or forward contracts, or options on any of the foregoing,
  other than for purposes of hedging contracts to buy or sell
  physical energy or energy transportation.  In addition, in
  transacting business outside of the native load service
  territory of CILCO, CILCORP shall not, and shall not permit
  any CILCORP Subsidiary to, enter into any energy-related sales
  or purchase contracts that would create an unhedged position
  of more than $100,000 for any single contract, or $1,000,000
  on a cumulative basis.
  
           Section 6.2    Covenants of AES .  AES covenants and
  agrees, as to itself and each of the AES Subsidiaries, that
  after the date of this Agreement and prior to the Effective
  Time or earlier termination of this Agreement, except as
  expressly contemplated or permitted in this Agreement, or to
  the extent CILCORP shall have otherwise consented in writing,
  which decision regarding consent shall be made as soon as
  reasonably practicable and which consent shall not be
  unreasonably withheld:
  
                (a)  Cooperation, Notification.  AES shall (i)
  promptly advise CILCORP of (A) any representation or warranty
  made by it contained in this Agreement that is qualified as to
  materiality becoming untrue or inaccurate in any respect or
  any such representation or warranty that is not so qualified
  becoming untrue or inaccurate in any material respect and (B)
  the failure by it to comply in any material respect with or
  satisfy in any material respect any covenant, condition or
  agreement to be complied with or satisfied by it under this
  Agreement (provided, however, that no such notification shall
  affect the representations, warranties, covenants or
  agreements of the parties (or remedies with respect thereto)
  or the conditions to the obligations of the parties under this
  Agreement) and (ii) promptly provide CILCORP with copies of
  all filings made by AES or any AES Subsidiary with any state
  or federal court, administrative agency, commission or other
  Governmental Authority in connection with this Agreement and
  the transactions contemplated hereby.
  
                (b)  No Breach, Etc.  AES shall not, and AES
  shall not permit any AES Subsidiary to, take any action that
  would or is reasonably likely to result in a material breach
  of any provision of this Agreement or in any of its
  representations and warranties set forth in this Agreement
  being untrue on and as of the Closing Date.
  
                (c)  PUHCA Application.  Subject to AES'
  determination not to seek an exemption under PUHCA Section
  3(a)(5), as promptly as practicable following the date hereof,
  AES shall file with the SEC an application (the "PUHCA
  Application") pursuant to PUHCA for an exemption from the
  requirement that it register as a holding company under PUHCA
  Section 3(a)(5).  AES shall promptly notify CILCORP upon
  issuance of the SEC Exemption Order (as defined in Section
  8.3(e) hereof).
  
                (d)  Financing.  AES shall diligently pursue and
  use commercially reasonable efforts to arrange financing or
  obtain funds sufficient to pay the Aggregate Consideration
  Amount in the Merger (the "Financing").  The Financing may
  consist of (i) non-recourse borrowings and (ii) general
  corporate funding from the capital reserves, working capital
  and other sources of AES, in each case, in such proportions to
  the Aggregate Consideration Amount as AES shall determine in
  its sole discretion.  AES covenants and agrees that if the
  proceeds from the sources specified in clauses (i) and (ii) of
  this Section 6.2(d) are less than the Aggregate Consideration
  Amount, AES shall use commercially reasonable efforts to sell
  a number of shares of AES Common Stock (the "AES Common Stock
  Sale") so that the aggregate proceeds from clauses (i) and
  (ii) of this Section 6.2(d) and the AES Common Stock Sale
  shall be an amount equal to the Aggregate Consideration
  Amount.  Notwithstanding the foregoing, AES shall have no
  obligation to undertake any action to arrange financing,
  obtain funds or sell AES Common Stock in the AES Common Stock
  Sale until CILCORP shall have delivered to AES a certificate
  signed by an executive officer of CILCORP to the effect that,
  to the best of such officer's knowledge as of the date of the
  delivery of such certificate, the conditions set forth in
  Section 8.1 hereof have been satisfied  by CILCORP and the
  conditions set forth in Sections 8.3(a) (as of the date of
  such certificate), 8.3(b) (as of the date hereof and as of the
  date of such certificate), 8.3(c), 8.3(d) and 8.3(k) hereof
  have been satisfied by CILCORP or waived by AES, which
  certificate must be delivered by CILCORP within five business
  days of all such conditions being satisfied or waived, as the
  case may be (the "CILCORP Certificate") and AES shall have
  satisfied or waived the condition set forth in Section 8.3(e)
  hereof, and provided further, that in no event shall AES be
  required to arrange financing, obtain funds or sell AES Common
  Stock in the AES Common Stock Sale if there shall have
  occurred (or, in the case of clauses (i) through (iv) below,
  been threatened) (i) any general suspension of trading in, or
  limitation on prices for, securities on any national
  securities exchange or in the over-the-counter market in the
  United States, (ii) a declaration of a banking moratorium or
  any suspension of payments in respect of banks in the United
  States, (iii) any limitation (whether or not mandatory) by any
  government, domestic, foreign or supranational, or
  governmental entity on the extension of credit by banks or
  other lending institutions in the United States, (iv) a
  commencement of a war or armed hostilities or other national
  or international calamity involving the United States, (v) any
  significant disruption or material adverse change in the
  market for new issues of senior debt securities, credit
  facilities or common or preferred equity securities (or
  equity-linked securities) by a company having financial
  characteristics similar to those of AES, (vi) any significant
  disruption or material adverse change in the financial or
  capital markets in general which make it impracticable for a
  company having financial characteristics similar to those of
  AES to finance a transaction of the size and nature as that
  contemplated hereunder on commercially reasonable financing
  terms or (vii) in the case of any of the foregoing existing at
  the time of the proposed AES Common Stock Sale, a material
  acceleration or worsening thereof; and provided, further, that
  in no event shall AES be required to sell AES Common Stock in
  the AES Common Stock Sale if during any five trading days
  following the date of delivery of the CILCORP Certificate,
  there shall have occurred a decline of twenty percent or more
  in the average closing price of AES Common Stock from the
  average closing price over the five trading days preceding the
  date hereof.  The sole remedy for failure to obtain the
  Financing shall be as provided in Section 9.1(b)(iv) hereof,
  except in the case of intentional and willful breach by AES of
  its obligations (as qualified herein) under this Section
  6.2(d).
  
  
                           ARTICLE VII
  
                      ADDITIONAL AGREEMENTS
  
           Section 7.1    Access to Information.  Upon
  reasonable notice, CILCORP shall, and shall cause the CILCORP
  Subsidiaries to, afford to the officers, directors, employees,
  accountants, counsel, investment bankers, financial advisors
  and other representatives (collectively, "Representatives") of
  AES reasonable access, during normal business hours throughout
  the period prior to the Effective Time, to all of their
  respective properties, books, contracts, commitments, records,
  budgets, forecasts and other information (including, but not
  limited to, Tax Returns) and, during such period, CILCORP
  shall, and shall cause the CILCORP Subsidiaries to, furnish
  promptly to AES (i) access to each report, schedule and other
  document filed or received by it or any of the CILCORP
  Subsidiaries pursuant to the requirements of federal or state
  securities laws or filed with or sent to the SEC, the FERC,
  the public utility commission of any state, the Department of
  Labor, the Immigration and Naturalization Service, the
  Environmental Protection Agency (state, local and federal),
  the IRS, the Department of Justice, the Federal Trade Commis
  sion, or any other federal or state regulatory agency or
  commission or other Governmental Authority, (ii) access to all
  information concerning CILCORP, the CILCORP Subsidiaries,
  directors, officers and stockholders, properties, facilities
  or operations owned, operated or otherwise controlled by
  CILCORP, or if not so owned, operated or controlled, which
  properties, facilities or operations that CILCORP may
  nonetheless obtain access to through the exercise of
  reasonable diligence, and such other matters as may be
  reasonably requested by AES in connection with any filings,
  applications or approvals required or contemplated by this
  Agreement or for any other reason related to the transactions
  contemplated by this Agreement; (iii) such additional
  information relating to Taxes as AES shall from time to time
  reasonably request (or, where applicable, to cooperate with
  AES in collecting such information), including information
  relating to (a) Tax basis of the stock of the CILCORP
  Subsidiaries, (b) earnings and profits, (c) material Tax
  elections, (d) net operating loss carryovers and Tax credit
  carryovers, (e) intercompany transactions, (f) reconciliation
  of book and Tax items, (g) the rollout of any deferred Tax
  items and (h) ongoing audits (including copies of any Internal
  Revenue Service Forms 4564 or other similar information
  document requests) and (iv) office space and equipment at
  CILCORP's headquarters for the purposes of designing a
  transition plan in conjunction with CILCORP's Representatives.
  Subject to the following sentence, such information provided
  to AES may be shown to AES' investment bankers and financial
  advisors.  Each party shall, and shall cause its Subsidiaries
  and Representatives to, hold in strict confidence all
  documents and information concerning the other furnished to it
  in connection with the transactions contemplated by this
  Agreement in accordance with the Confidentiality Agreement,
  dated as of July 8, 1998, between AES and CILCORP (the
  "Confidentiality Agreement").  Notwithstanding the foregoing,
  nothing herein shall require CILCORP to disclose system
  information that it is precluded from sharing with others
  pursuant to FERC Orders 888 and 889 (as amended) without
  simultaneous disclosure to all parties on its electronic
  bulletin board.
  
           Section 7.2    Proxy Statement.
  
                (a)  As soon as reasonably practicable after the
  date of this Agreement, CILCORP shall prepare and file with
  the SEC, and AES shall cooperate with CILCORP in such
  preparation and filing, a preliminary proxy statement or
  information statement relating to this Agreement and the
  transactions contemplated hereby and use its commercially
  reasonable efforts to furnish the information required to be
  included by the SEC in the Proxy Statement (as hereinafter
  defined) and, after consultation with and approval of AES, to
  respond promptly to any comments made by the SEC with respect
  to the preliminary proxy statement and, promptly after the
  completion of any SEC review or notification from the SEC that
  the preliminary proxy materials will not be subject to
  comment, cause a definitive proxy statement or information
  statement (the "Proxy Statement") to be mailed to its
  stockholders.  Subject to the fiduciary obligations of the
  Board of Directors under applicable law, CILCORP shall include
  in the Proxy Statement the recommendation of the Board of
  Directors of CILCORP that the stockholders of CILCORP approve
  and adopt this Agreement and the transactions contemplated
  hereby.
  
                (b)  AES agrees that (i) it will provide CILCORP
  with all information concerning AES necessary or appropriate
  to be included in the Proxy Statement and (ii) at the meeting
  of CILCORP stockholders to be held in connection with the
  Merger and the other transactions contemplated hereby, it will
  vote, or cause to be voted, all of the Shares then owned by,
  or with respect to which proxies are held by it or any of the
  AES Subsidiaries, if any, in favor of the approval and
  adoption of this Agreement.
  
                (c)  CILCORP and AES shall cooperate with one
  another in the preparation and filing of the Proxy Statement
  and shall use their reasonable best efforts to promptly obtain
  and furnish the information required to be included in the
  Proxy Statement and to respond promptly to any comments or
  requests made by the SEC with respect to the Proxy Statement.
  Each party hereto shall promptly notify the other parties of
  the receipt of comments of, or any requests by, the SEC with
  respect to the Proxy Statement, and shall promptly supply the
  other parties with copies of all correspondence between such
  party (or its Representatives) and the SEC (or its staff)
  relating thereto.  CILCORP and AES each agree to correct any
  information provided by it for use in the Proxy Statement
  which shall have become, or is, false or misleading.
  
           Section 7.3    Regulatory Approvals and Other
  Matters.
  
                (a)  HSR Filings.  Each party hereto shall file
  or cause to be filed with the Federal Trade Commission and the
  Department of Justice any notifications required to be filed
  under the Hart-Scott-Rodino Antitrust Improvements Act of
  1976, as amended (the "HSR Act"), and the rules and
  regulations promulgated thereunder with respect to the
  transactions contemplated hereby.  Such parties will use all
  commercially reasonable efforts to coordinate such filings and
  any responses thereto, to make such filings promptly and to
  respond promptly to any requests for additional information
  made by either of such agencies.
  
                (b)  Other Approvals.  Each party hereto shall
  cooperate with the others and use its commercially reasonable
  efforts to promptly prepare and file all necessary
  documentation, to effect all necessary applications, notices,
  petitions, filings and other documents, and to use reasonable
  best efforts to obtain all necessary permits, consents,
  approvals and authorizations of all Governmental Authorities
  and all other persons necessary or advisable to consummate (i)
  the transactions contemplated hereby, including, without
  limitation, the SEC Exemption Order (as defined in Section
  8.3(e) hereof), the AES Required Statutory Approvals, the
  CILCORP Required Statutory Approvals, the AES Required
  Consents and the CILCORP Required Consents (and any concurrent
  or related rate filings, if any), and (ii) if AES determines
  to proceed with the Second Merger and so notifies CILCORP, the
  Second Merger Statutory Approvals and the CILCORP Second
  Merger Required Consents.  AES and CILCORP agree that they
  will consult with each other with respect to the obtaining of
  all such necessary or advisable permits, consents, approvals
  and authorizations of Governmental Authorities; provided,
  however, that it is agreed that CILCORP shall have primary
  responsibility for the preparation and filing of any
  applications with or notifications to applicable state
  regulatory authorities for approval of the Merger.  Each of
  AES and CILCORP shall have the right to review and approve in
  advance drafts of all such necessary applications, notices,
  petitions, filings and other documents made or prepared in
  connection with the transactions contemplated by this
  Agreement, which approval shall not be unreasonably withheld
  or delayed.
  
           Section 7.4    Approval of CILCORP Stockholders.
  CILCORP shall, as soon as reasonably practicable after the
  date of this Agreement, (i) take all steps necessary to duly
  call, give notice of, convene and hold a meeting of its
  stockholders (the "CILCORP Meeting") for the purpose of
  securing the CILCORP Stockholders' Approval, (ii) distribute
  to its stockholders the Proxy Statement in accordance with
  applicable federal and state law and with its Articles of
  Incorporation and By-Laws, (iii) subject to the fiduciary
  duties of its Board of Directors, recommend to its
  stockholders the approval of the Merger, this Agreement and
  the transactions contemplated hereby and (iv) cooperate and
  consult with AES with respect to each of the foregoing
  matters.  Without limiting the generality of the foregoing,
  CILCORP agrees that its obligations pursuant to the first
  sentence of this Section 7.4 shall not be affected by the
  commencement, public proposal, public disclosure or
  communication to CILCORP of any Acquisition Proposal (as
  defined in Section 7.8(b) hereof).
  
           Section 7.5    Directors' and Officers'
  Indemnification.
  
                (a)  Indemnification.  From and after the
  Effective Time, the Surviving Corporation shall, to the
  fullest extent permitted by applicable law, indemnify, defend
  and hold harmless each person who is now, or has been at any
  time prior to the date hereof, an officer or director of
  CILCORP or any of the CILCORP Subsidiaries (each an
  "Indemnified Party" and collectively, the "Indemnified
  Parties") against all losses, expenses (including reasonable
  attorney's fees and expenses), claims, damages or liabilities
  or, subject to the proviso of the next succeeding sentence,
  amounts paid in settlement, arising out of actions or
  omissions occurring at or prior to the Effective Time that
  are, in whole or in part, (x) based on or arising out of the
  fact that such person is or was a director or officer of
  CILCORP or any CILCORP Subsidiary or (y) arising out of or
  pertaining to the transactions contemplated by this Agreement
  (the "Indemnified Liabilities").  In the event of any such
  loss, expense, claim, damage or liability (whether or not
  arising prior to the Effective Time), (i) the Surviving
  Corporation shall pay the reasonable fees and expenses of
  counsel for the Indemnified Parties selected by the Surviving
  Corporation, which counsel may also serve as counsel to the
  Surviving Corporation and which counsel shall be reasonably
  satisfactory to the Indemnified Parties (whose consent shall
  not be unreasonably withheld), promptly after statements
  therefor are received and otherwise advance to such
  Indemnified Party upon request reimbursement of documented
  expenses reasonably incurred, in either case to the extent not
  prohibited by the Illinois Act subject to the provision by
  such Indemnified Party of an undertaking to reimburse the
  amounts so advanced in the event of a final determination by a
  court of competent jurisdiction that such Indemnified Party is
  not entitled thereto, (ii) the Surviving Corporation will
  cooperate in the defense of any such matter and (iii) any
  determination required to be made with respect to whether an
  Indemnified Party's conduct complies with the standards set
  forth under the Illinois Act and the Articles of Incorporation
  or By-Laws of CILCORP shall be made by independent counsel
  mutually acceptable to the Surviving Corporation and the
  Indemnified Party (the "Independent Counsel"); provided,
  however, that the Surviving Corporation shall not be liable
  for any settlement effected without its written consent (which
  consent shall not be unreasonably withheld).  The Indemnified
  Parties as a group may retain only one law firm with respect
  to each related matter except to the extent there is, in the
  written opinion of the Independent Counsel, under applicable
  standards of professional conduct, a conflict on any
  significant issue between positions of such Indemnified Party
  and any other Indemnified Party or Indemnified Parties.
  
                (b)  Insurance.  For a period of six years after
  the Effective Time, the Surviving Corporation shall cause to
  be maintained in effect existing policies of directors' and
  officers' liability insurance maintained by CILCORP; provided,
  that the Surviving Corporation may substitute therefor
  policies of substantially similar coverage and amounts
  containing terms that are no less advantageous with respect to
  matters occurring prior to the Effective Time to the extent
  such liability insurance can be maintained annually at a
  commercially reasonable cost to the Surviving Corporation for
  annual premiums for such directors' and officers' liability
  insurance, which existing premium costs are disclosed on
  Section 7.5(b) of the CILCORP Disclosure Schedule; provided,
  further, that if such insurance cannot be so maintained or
  obtained at such cost, the Surviving Corporation shall
  maintain or obtain as much of such insurance for CILCORP as
  can be so maintained or obtained at a commercially reasonable
  cost for annual premiums for directors' and officers'
  liability insurance.
  
                (c)  Successors.  In the event the Surviving
  Corporation or any of its successors or assigns (i)
  consolidates with or merges into any other person or entity
  and shall not be the continuing or surviving corporation or
  entity of such consolidation or merger or (ii) transfers all
  or substantially all of its properties and assets to any
  person or entity, then and in either such case, proper
  provisions shall be made so that the successors and assigns of
  the Surviving Corporation shall assume the obligations set
  forth in this Section 7.5.
  
                (d)  Survival of Indemnification.  To the
  fullest extent permitted by applicable law, from and after the
  Effective Time, all rights to indemnification existing as of
  the date hereof in favor of any Indemnified Party, as provided
  in their respective Articles of Incorporation and By-Laws in
  effect on the date thereof, shall survive the Merger and shall
  continue in full force and effect for a period of six years
  from the Effective Time.
  
           Section 7.6    Disclosure Schedules.  On or before
  the date hereof, (i) AES has delivered to CILCORP the AES
  Disclosure Schedule, accompanied by a certificate signed by an
  executive officer of AES stating the AES Disclosure Schedule
  has been delivered pursuant to this Section 7.6 and (ii)
  CILCORP has delivered to AES the CILCORP Disclosure Schedule,
  accompanied by a certificate signed by an executive officer of
  CILCORP stating the CILCORP Disclosure Schedule has been
  delivered pursuant to this Section 7.6.  The AES Disclosure
  Schedule and the CILCORP Disclosure Schedule are collectively
  referred to herein as the "Disclosure Schedules."  The
  Disclosure Schedules shall be deemed to constitute an integral
  part of this Agreement and to modify the respective
  representations, warranties, covenants or agreements of the
  parties hereto contained herein to the extent that such
  representations, warranties, covenants or agreements expressly
  refer to the Disclosure Schedules.  Anything to the contrary
  contained herein or in the Disclosure Schedules
  notwithstanding, any and all statements, representations,
  warranties or disclosures set forth in the Disclosure
  Schedules delivered on or before the date hereof shall be
  deemed to have been made on and as of the date hereof.  From
  time to time prior to the Closing, the parties shall promptly
  supplement or amend the Disclosure Schedules with respect to
  any matter, condition or occurrence hereafter arising which,
  if existing or occurring at the date of this Agreement, would
  have been required to be set forth or described in the
  Disclosure Schedules.  No supplement or amendment shall be
  deemed to cure any breach of any representation or warranty
  made in this Agreement or have any effect for the purpose of
  determining satisfaction of the conditions set forth in
  Section 8.2(b) hereof or Section 8.3(b) hereof.
  
           Section 7.7    Public Announcements.  Subject to each
  party's disclosure obligations imposed by applicable law,
  court process or by obligations pursuant to any listing
  agreement with any national securities exchange, AES and
  CILCORP will cooperate with each other in the development and
  distribution of all news releases and other public information
  disclosures with respect to this Agreement or any of the
  transactions contemplated hereby and shall not issue any
  public announcement or statement with respect hereto or
  thereto without the consent of the other party (which consent
  shall not be unreasonably withheld and which decision
  regarding consent shall be made as soon as reasonably
  practicable).
  
           Section 7.8    No Solicitations.
  
                (a)  From and after the date hereof, (i) CILCORP
  will not, and will not authorize or permit any of its
  Representatives to, directly or indirectly, solicit, initiate
  or encourage (including by way of furnishing information) or
  take any other action to facilitate knowingly any inquiries or
  the making of any proposal which constitutes or may reasonably
  be expected to lead to an Acquisition Proposal (as defined in
  Section 7.8(b) hereof) from any person, or engage in any
  discussion or negotiations relating thereto and (ii) neither
  the Board of Directors of CILCORP nor any committee thereof
  shall (A) withdraw or modify, or propose publicly to withdraw
  or modify, in a manner adverse to AES, the approval or
  recommendation by such Board of Directors or such committee of
  the Merger or this Agreement, (B) approve or recommend, or
  propose publicly to approve or recommend, any Acquisition
  Proposal, or (C) cause CILCORP or any CILCORP Subsidiary to
  enter into any letter of intent, agreement in principle,
  acquisition agreement or other similar agreement (each, an
  "Acquisition Agreement") related to any Acquisition Proposal;
  provided, however, that CILCORP may, at any time prior to
  receipt of CILCORP Stockholders' Approval (the "CILCORP
  Applicable Period"), (i) in response to an Acquisition
  Proposal which was not solicited by it or its Representatives
  and which did not otherwise result from a breach of this
  Section 7.8, if the Board of Directors of CILCORP (x)
  reasonably believes in good faith, after consultation with its
  financial advisors, that an Acquisition Proposal may be a
  Superior Proposal (as defined in Section 7.8(b) hereof) and
  (y) determines in good faith, after consultation with its
  financial advisors and outside counsel, that failing to take
  such action could reasonably be expected to be a breach of its
  fiduciary duties to CILCORP's stockholders under applicable
  law, and subject to providing AES with prior written notice of
  its decision to take such action (the "CILCORP Notice") and
  compliance with Section 7.8(c) hereof, (1) furnish information
  with respect to CILCORP and the CILCORP Subsidiaries to any
  person making a Superior Proposal pursuant to a customary
  confidentiality agreement and (2) participate in discussions
  or negotiations regarding such Superior Proposal, (ii) comply
  with Rule 14e-2 promulgated under the Exchange Act with regard
  to a tender or exchange offer (provided that, except in
  connection with a termination of this Agreement pursuant to
  clause (iii) of this proviso, neither CILCORP nor its Board of
  Directors nor any committee thereof shall withdraw or modify,
  or propose publicly to withdraw or modify, its position with
  respect to this Agreement or the Merger or approve or
  recommend, or propose publicly to approve or recommend, an
  Acquisition Proposal), and/or (iii) in the event that during
  the CILCORP Applicable Period the Board of Directors of
  CILCORP reasonably believes in good faith, after consultation
  with its financial advisors and outside counsel, (x) that it
  has received an Acquisition Proposal that constitutes a
  Superior Proposal and (y) that failure to terminate this
  Agreement and accept such Superior Proposal could reasonably
  be expected to be a breach of its fiduciary duties to
  CILCORP's stockholders under applicable law, by action of the
  Board of Directors of CILCORP (subject to this sentence and
  Section 9.1(d)(ii) hereof), terminate this Agreement (and,
  following the exercise of such termination right, withdraw or
  modify in any adverse manner its approval or recommendation of
  this Agreement or the Merger, and approve or recommend any
  merger, consolidation, business combination, recapitalization,
  liquidation, dissolution or similar transaction involving
  CILCORP or any such CILCORP Subsidiary, other than the
  transactions contemplated by this Agreement), but only at a
  time that is during the CILCORP Applicable Period and is after
  the third business day following AES' receipt of written
  notice advising AES that the Board of Directors of CILCORP is
  prepared to accept a Superior Proposal, specifying the
  material terms and conditions of such Superior Proposal and
  identifying the person making such Superior Proposal.  CILCORP
  shall immediately cease and terminate any existing
  solicitation, initiation, encouragement, activity, discussion
  or negotiation with any persons conducted heretofore by
  CILCORP or its Representatives with respect to any of the
  foregoing.
  
                (b)  As used herein, (i) "Acquisition Proposal"
  shall mean any inquiry, proposal or offer from any person
  relating to any direct or indirect acquisition or purchase of
  a business (a "Material Business") that constitutes 15% or
  more of the net revenues, net income or the assets (including
  equity securities) of CILCORP and the CILCORP Subsidiaries,
  taken as a whole, or 15% or more of any class of voting
  securities of CILCORP or any CILCORP Subsidiary owning,
  operating or controlling a Material Business, any tender offer
  or exchange offer that it consummated would result in any
  person beneficially owing 15% or more of any class of voting
  securities of CILCORP or any such CILCORP Subsidiary, or any
  merger, consolidation, business combination, recapitalization,
  liquidation, dissolution or similar transaction involving
  CILCORP or any such CILCORP Subsidiary, other than the
  transactions contemplated by this Agreement; provided,
  however, that no transaction permitted pursuant to Section
  6.1(f) hereof shall be deemed an Acquisition Proposal for any
  purpose and (ii) a "Superior Proposal" shall mean any proposal
  made by a third party to acquire, directly or indirectly,
  including pursuant to a tender offer, exchange offer, merger,
  consolidation, business combination, recapitalization,
  liquidation, dissolution or similar transaction, for
  consideration consisting of cash and/or securities, more than
  50% of the combined voting power of the shares of CILCORP
  Common Stock then outstanding or all or substantially all the
  assets of CILCORP which the Board of Directors of CILCORP
  determines in its good faith judgment, after consultation with
  its financial advisors and outside counsel, to be more
  favorable to CILCORP's Stockholders (taking into account any
  changes to the financial terms of this Agreement proposed by
  AES in response to such proposal and all financial and
  strategic considerations, including relevant legal, financial,
  regulatory and other aspects of the proposal and the third
  party making such proposal and the conditions and the
  prospects for completion of such proposal, the strategic
  direction and benefits sought by CILCORP and any changes to
  this Agreement proposed by AES in response to such proposal)
  than the Merger and the other transactions contemplated by
  this Agreement.
  
                (c)  CILCORP shall promptly advise AES orally
  and in writing of the receipt of any Acquisition Proposal or
  Superior Proposal and of the receipt of any inquiry with
  respect to or which CILCORP reasonably believes could lead to
  any Acquisition Proposal or Superior Proposal.  CILCORP shall
  promptly advise AES orally and in writing of the identity of
  the person making any such Acquisition Proposal or Superior
  Proposal or inquiry and of the material terms of any such
  Acquisition Proposal or Superior Proposal and of any material
  changes thereto.
  
           Section 7.9    Expenses.  All costs and expenses
  incurred in connection with this Agreement and the
  transactions contemplated hereby shall be paid by the party
  incurring such expenses.
  
           Section 7.10   Board of Directors.  At or prior to
  the Effective Time, CILCORP shall obtain the resignation as of
  the Effective Time of each director of CILCORP and, if so
  requested by AES, of any director or officer of any CILCORP
  Subsidiary or officer of CILCORP.
  
           Section 7.11   Illinois Responsible Property Transfer
  Act.  If, as a result of the transactions contemplated by this
  Agreement or as a result of any debt financing undertaken by
  AES or an affiliate of AES or a AES Subsidiary in order to
  complete the transactions contemplated by this Agreement, the
  requirements of the Illinois Responsible Property Transfer Act
  (the "Property Transfer Act") are triggered with respect to
  any of the real property owned or operated by CILCORP, any
  CILCORP Subsidiary or any CILCORP Joint Venture, CILCORP shall
  be responsible, at its own cost and expense, for compliance
  with all of the obligations of the Property Transfer Act,
  including, without limitation, the preparation of any
  disclosure document required to be provided to AES or any
  lender.
  
           Section 7.12   Signature Authority.     Effective as
  of the Closing, at the request of AES, CILCORP shall prepare
  and deliver to AES a list of all persons with signature
  authority on the bank accounts of CILCORP and the CILCORP
  Subsidiaries and all persons with authority to bind CILCORP
  and any CILCORP Subsidiary to an agreement with an amount in
  excess of $100,000 or a term longer than one year.  CILCORP
  shall revoke such authority of any person designated by AES,
  effective as of the morning of the Closing Date.
  
           Section 7.13   Termination of Existing Tax Sharing
  Agreements.  CILCORP shall take or cause to be taken all
  actions necessary such that after the Closing Date, neither
  CILCORP nor any CILCORP Subsidiary shall have any further
  rights or liabilities under any agreement existing on or
  before the Closing Date which relates to the allocation or
  sharing of Taxes.
  
           Section 7.14   Deferred Compensation Plans.  Prior to
  the Effective Time, CILCORP will take all actions necessary or
  appropriate to establish a so-called "rabbi trust" (in form
  and substance reasonably satisfactory to AES) which shall be
  used to fund the CILCO Executive Deferral Plan (the "EDP I
  Plan").  Upon the establishment of the rabbi trust for the EDP
  I Plan, CILCORP shall transfer ownership of the CILCORP life
  insurance policies that currently are intended to fund the EDP
  I Plan to such trust.  After the Effective Time, AES shall
  cause CILCO to remain the primary obligor of and to honor, in
  accordance with its terms, the EDP I Plan and the related
  rabbi trust.  Nothing in this Section 7.14 shall require AES
  or CILCO to allow participants in such plan to defer
  compensation income that will be earned by the participants on
  or after the Effective Time.
  
  
                          ARTICLE VIII
  
                           CONDITIONS
  
           Section 8.1    Conditions to Each Party's Obligation
  to Effect the Merger.  The respective obligations of each
  party to effect the Merger shall be subject to the
  satisfaction or waiver on or prior to the Closing Date of the
  following conditions:
  
                (a)  Stockholder Approvals.  The CILCORP
  Stockholders' Approval shall have been obtained.
  
                (b)  No Injunctions or Restraints.  No judgment,
  decree, statute, law, ordinance, rule, regulation, temporary
  restraining order, preliminary or permanent injunction or
  other order enacted, entered, promulgated, enforced or issued
  by any court of competent jurisdiction or other Governmental
  Authority or other legal restraint or prohibition
  (collectively, "Restraints") preventing  the consummation of
  the Merger shall be in effect; provided, however, that each of
  the parties shall have used all reasonable efforts to prevent
  the entry of any such Restraints and to appeal as promptly as
  possible any such Restraints that may be entered.
  
                (c)  Statutory Approvals.  The AES Required
  Statutory Approvals and the CILCORP Required Statutory
  Approvals shall have been obtained, such approvals shall have
  become Final Orders (as defined below) and such Final Orders
  shall not impose terms or conditions which, in the aggregate,
  would have, or insofar as reasonably can be foreseen, could
  have, a AES Material Adverse Effect or a CILCORP Material
  Adverse Effect, or which would be inconsistent with the
  agreements of the parties contained herein. The term "Final
  Order" shall mean action by the relevant regulatory authority
  which has not been reversed, stayed, enjoined, set aside,
  annulled or suspended, with respect to which any waiting
  period prescribed by law before the transactions contemplated
  hereby may be consummated has expired, and as to which all
  conditions to the consummation of such transactions prescribed
  by law, regulation or order have been satisfied.
  
                (d)  HSR Act.  All applicable waiting periods
  under the HSR Act shall have expired or been terminated.
  
           Section 8.2    Conditions to Obligation of CILCORP to
  Effect the Merger.  The obligation of CILCORP to effect the
  Merger shall be further subject to the satisfaction or waiver,
  on or prior to the Closing Date, of the following conditions:
  
                (a)  Performance of Obligations of AES.  AES and
  Merger Sub each shall have performed in all material respects
  their respective agreements and covenants contained in or
  contemplated by this Agreement, which are required to be
  performed by it at or prior to the Closing Date.
  
                (b)  Representations and Warranties.  The
  representations and warranties of AES set forth in this
  Agreement shall be true and correct in all material respects
  (or where any statement in a representation or warranty
  expressly includes a standard of materiality, such statement
  shall be true and correct in all respects as so qualified) as
  of the date hereof (except to the extent such representations
  and warranties speak as of an earlier or later date) and as of
  the Closing Date as if made on and as of the Closing Date,
  except as otherwise contemplated by this Agreement.
  
                (c)  Closing Certificates.  CILCORP shall have
  received a certificate signed by an executive officer of AES,
  dated the Closing Date, to the effect that, to the best of
  such officer's knowledge, the conditions set forth in Section
  8.2(a) hereof and Section 8.2(b) hereof have been satisfied.
  
           Section 8.3    Conditions to Obligation of AES and
  Merger Sub to Effect the Merger.  The obligation of AES and
  Merger Sub to effect the Merger shall be further subject to
  the satisfaction or waiver, on or prior to the Closing Date,
  of the following conditions:
  
                (a)  Performance of Obligations of CILCORP.
  CILCORP (and/or appropriate CILCORP Subsidiaries) shall have
  performed in all material respects its agreements and
  covenants contained in or contemplated by this Agreement which
  are required to be performed by it at or prior to the Closing
  Date.
  
                (b)  Representations and Warranties. The
  representations and warranties of CILCORP set forth in this
  Agreement shall be true and correct in all material respects
  (or where any statement in a representation or warranty
  expressly includes a standard of materiality, such statement
  shall be true and correct in all respects as so qualified) as
  of the date hereof (except to the extent such representations
  and warranties speak as of an earlier or later date) and as of
  the Closing Date as if made on and as of the Closing Date,
  except as otherwise contemplated by this Agreement.
  
                (c)  CILCORP Material Adverse Effect.  Subject
  to Section 8.3(c) of the CILCORP Disclosure Schedule, no
  CILCORP Material Adverse Effect shall have occurred and there
  shall exist no fact or circumstance that would or, insofar as
  reasonably can be foreseen, could have a CILCORP Material
  Adverse Effect.
  
                (d)  CILCORP Required Consents.  The CILCORP
  Required Consents shall have been obtained.
  
                (e)  PUHCA Exemption.  The SEC shall have issued
  an order in form and substance reasonably satisfactory to AES
  (the "SEC Exemption Order") granting AES an exemption from
  registration as a holding company under PUHCA pursuant to
  PUHCA Section 3(a)(5), and the SEC Exemption Order shall be in
  full force and effect on the Closing Date.
  
                (f)  Financing.  AES shall have the proceeds
  available pursuant to the Financing sufficient to pay the
  Aggregate Consideration Amount.
  
                (g)  Closing Certificates.  AES shall have
  received a certificate signed by an executive officer of
  CILCORP, dated the Closing Date, to the effect that, to the
  best of such officer's knowledge, the conditions set forth in
  Sections 8.3(a), (b), (c), (d) and (k) hereof have been
  satisfied.
  
                (h)  AES Required Consents.  The AES Required
  Consents shall have been obtained.
  
                (i)  No Injunctions or Restraints as to Second
  Merger. No Restraints preventing  the consummation of the
  Second Merger shall be in effect; provided, however, that each
  of the parties shall have used all reasonable efforts to
  prevent the entry of any such Restraints and to appeal as
  promptly as possible any such Restraints that may be entered.
  
                (j)  Trigger of CILCORP Rights.  No event has
  occurred or could occur pursuant to this Agreement or
  otherwise that would result in the triggering of any right or
  entitlement of CILCORP stockholders under the CILCORP Rights
  Agreement, including a "flip-in" or "flip-over" or similar
  event commonly described in such rights plans which, in the
  reasonable judgment of AES, would have or be reasonably likely
  to result in a CILCORP Material Adverse Effect or materially
  change the number of outstanding equity securities of CILCORP,
  and the CILCORP Rights shall not have become nonredeemable by
  the CILCORP Board of Directors.
  
                (k)  Illinois Commerce Commission.  (i) The
  Illinois Commerce Commission shall have issued the Illinois
  Certification and (ii) AES shall reasonably believe that any
  order of, approval by or result of any filing, proceeding or
  notice with the Illinois Commerce Commission required under
  the Illinois Public Utilities Act in connection with the
  Merger could not be expected to have an adverse effect on AES'
  ability to obtain the Financing or on AES, CILCORP or any of
  the CILCORP Subsidiaries after the Effective Time (the "AES
  Reasonable Belief Standard").
  
  
                           ARTICLE IX
  
                TERMINATION, AMENDMENT AND WAIVER
  
           Section 9.1    Termination.  This Agreement may be
  terminated at any time prior to the Closing Date:
  
                (a)   without payment of a termination fee by
  mutual written consent of CILCORP and AES.
  
                (b)   by AES or CILCORP under any of the
  following circumstances:
  
                     (i)  without payment of a termination fee,
  if any state or federal law, order, rule or regulation is
  adopted or issued, which has the effect, as supported by the
  written opinion of outside counsel for such party, of
  prohibiting the Merger, or by any party hereto if any court of
  competent jurisdiction in the United States or any state shall
  have issued an order, judgment or decree permanently
  restraining, enjoining or otherwise prohibiting the Merger,
  and such order, judgment or decree shall have become final and
  nonappealable.
  
                     (ii) after the eighteen-month anniversary
  of the date of this Agreement without payment of a termination
  fee, by written notice to the other party, if the Merger shall
  not have been consummated on or before the eighteen-month
  anniversary of the date of this Agreement; provided, however,
  that the right to terminate the Agreement under this Section
  9.1(b)(ii) shall not be available to any party whose failure
  to fulfill any obligation under this Agreement has been the
  cause of, or resulted in, the failure of the Merger to have
  been consummated, and provided further, that if after the
  fifteen-month anniversary of the date hereof and prior to the
  eighteen-month anniversary, CILCORP shall have delivered to
  AES the CILCORP Certificate as provided in Section 6.2(d),
  then neither AES nor CILCORP shall be entitled to terminate
  under this Section 9.1(b)(ii) until a period of 90 days shall
  have elapsed from the receipt of the CILCORP Certificate.
  
                     (iii)     by written notice to the other
  party, if the CILCORP Shareholders' Approval shall not have
  been obtained at the CILCORP Meeting, including any
  adjournments thereof.  In the event this Agreement is
  terminated pursuant to this Section 9.1(b)(iii) and at or
  within twelve months of the date of the CILCORP Meeting,
  CILCORP enters into any agreement with respect to an
  Alternative Transaction (as defined below), then within ten
  business days after the execution of such agreement, CILCORP
  shall immediately pay in cash to AES by wire transfer of same
  day funds a termination fee in an amount equal to 3.0% of the
  Aggregate Consideration Amount (the "Acquisition Termination
  Fee").  As used herein, "Alternative Transaction" means any of
  (i) a transaction or series of transactions pursuant to which
  any person (or group of persons) other than AES or the AES
  Subsidiaries and other than CILCORP and the CILCORP
  Subsidiaries (a "Third Party") acquires or would acquire,
  directly or indirectly, beneficial ownership (as defined in
  Rule 13d-3 under the Exchange Act) of more than 50% of the
  outstanding Shares of CILCORP or CILCO, as the case may be,
  whether from CILCORP or CILCO or pursuant to a tender offer or
  exchange offer or otherwise, (ii) any acquisition or proposed
  acquisition of CILCORP or CILCO by a merger or other business
  combination (including any so-called "merger of equals" and
  whether or not CILCORP or CILCO is the entity surviving any
  such merger or business combination) or (iii) any other
  transaction pursuant to which any Third Party acquires or
  would acquire, directly or indirectly, all or substantially
  all of the assets (including for this purpose the outstanding
  equity securities of CILCORP or CILCO, and any entity
  surviving any merger or combination including any of them) of
  CILCORP or CILCO.
  
                     (iv) by written notice to the other party
  after the Financing Due Date (as defined below), if the
  financing condition set forth in Section 8.3(f) has not been
  satisfied but all conditions to Closing have been satisfied on
  or prior to such date.  The "Financing Due Date" shall mean
  that date which is the 90th day after all conditions to
  Closing set forth in Article VIII have been satisfied other
  than Section 8.3(f), it being agreed that the 90 days shall
  not begin to run until all such conditions have been satisfied
  and AES has received a certificate signed by an executive
  officer of CILCORP attesting to the satisfaction by CILCORP of
  the conditions in Sections 8.1 and 8.3(a), (b), (c), (d) and
  (k), which certificate shall be dated no earlier than the date
  on which the last of the conditions set forth in Article VIII
  has been satisfied.  In the event that this Agreement is
  terminated pursuant to this Section 9.1(b)(iv), AES shall pay
  CILCORP in cash by wire transfer of same day funds within ten
  business days of such termination notice a termination fee in
  an amount equal to the product of (x) the Outstanding Shares
  and (y) $5.00 (the "Financing Termination Fee").
  
                (c) by AES under any of the following
  circumstances:
  
                     (i)  by written notice to CILCORP, if (x)
  there shall have been any material breach of any
  representation or warranty, or any material breach of any
  covenant or agreement, of CILCORP hereunder, and such breach
  shall not have been remedied within thirty days after receipt
  by CILCORP of notice in writing from AES, specifying the
  nature of such breach and requesting that it be remedied;
  provided, however that CILCORP shall not be entitled to expend
  more than $10 million to cure any and all such breaches
  without the prior written approval of AES; or (y) the Board of
  Directors of CILCORP (A) shall withdraw or modify in any
  manner adverse to AES its approval of this Agreement and the
  transactions contemplated hereby or its recommendation to its
  stockholders regarding the approval of this Agreement, (B)
  shall fail to reaffirm such  approval or recommendation upon
  the request of AES, (C) shall approve or recommend any
  Acquisition Proposal or (D) shall resolve to take any of the
  actions specified in clause (A), (B) or (C); provided,
  however, that AES and CILCORP acknowledge and affirm that
  notwithstanding anything in this Section 9.1(c)(i) to the
  contrary, the parties hereto intend this Agreement to be an
  exclusive agreement and, accordingly, nothing in this
  Agreement is intended to constitute a solicitation of an
  Acquisition Proposal, it being acknowledged and agreed that
  any such offer or proposal would interfere with the strategic
  advantages and benefits which the parties expect to derive
  from the Merger.  In the event this Agreement is terminated
  pursuant to this Section 9.1(c)(i), CILCORP shall pay AES in
  cash by wire transfer of same day funds within ten business
  days of such termination notice a termination fee in an amount
  equal to 3.0% of the Aggregate Consideration Amount (the
  "CILCORP Breach Termination Fee").
  
                     (ii) by written notice to CILCORP after the
  nine-month anniversary of the date hereof if the SEC Exemption
  Order shall not have been issued or irrevocably waived by AES
  prior to the time such notice is given.  In the event this
  Agreement is terminated pursuant to this Section 9.1(c)(ii),
  then AES shall pay CILCORP in cash by wire transfer of same
  day funds within ten business days of such termination notice
  a termination fee in an amount equal to the product of (x) the
  Outstanding Shares and (y) $1.00, together with an additional
  $0.00546448 per day for each day beginning on the later of (A)
  the day after the nine-month anniversary of the date hereof or
  (B) five days after the date of any order, approval or result,
  as the case may be, contemplated by clause (ii) of Section
  8.3(k) hereof, unless AES shall have notified CILCORP within
  such five-day period that the condition in clause (ii) of
  Section 8.3(k) hereof has not been satisfied, until the date
  of termination (up to a maximum of $3.00 under this clause
  (y)) (the "Regulatory Termination Fee"); provided, however,
  that the Regulatory Termination Fee shall not be payable to
  CILCORP if the failure to obtain the SEC Exemption Order by
  the nine-month anniversary of the date hereof has been caused
  by breach of this Agreement by CILCORP or by any action or
  omission by CILCORP after the date hereof unless taken at the
  direction of AES.
  
                     (iii)     without payment of a termination
  fee by AES or CILCORP by written notice to CILCORP after the
  one-year anniversary of the date hereof if any approvals or
  other actions of the Illinois Commerce Commission required
  under the Illinois Public Utilities Act have either not been
  issued, or if issued or taken, such order, approval or other
  actions shall not meet the AES Reasonable Belief Standard set
  forth in clause (ii) of Section 8.3(k) hereof, provided
  however that AES may terminate this Agreement (without payment
  of a termination fee by AES or CILCORP) by written notice to
  CILCORP after the eighth-month anniversary of the date hereof
  if AES does not reasonably believe that within the
  above-referenced one-year period the AES Reasonable Belief
  Standard set forth in the clause (ii) of Section 8.3 (k)
  hereof will be satisfied with respect to such approvals or
  other actions.
  
                (d) by CILCORP under any of the following
  circumstances:
  
                     (i)  by written notice to AES, if there
  shall have been any material breach of any representation or
  warranty contained in Sections 5.1, 5.2 and 5.5 hereof, or any
  material breach of any covenant or agreement of AES hereunder,
  and such breach shall not have been remedied within thirty
  days after receipt by AES of notice in writing from CILCORP,
  specifying the nature of such breach and requesting that it be
  remedied.  In the event this Agreement is terminated pursuant
  to this Section 9.1(d)(i), AES shall pay CILCORP in cash by
  wire transfer of same day funds within ten business days of
  such termination notice a termination fee in an amount equal
  to 3.0% of the Aggregate Consideration Amount (the "AES Breach
  Termination Fee").
  
                     (ii) in accordance with clause (iii) of the
  proviso to the first sentence of Section 7.8(a) hereof, by
  written notice to AES; provided that, in order for the
  termination of this Agreement pursuant to this subparagraph
  (ii) to be deemed effective, CILCORP shall have complied with
  all provisions of Section 7.8 hereof.  In the event this
  Agreement is terminated pursuant to this Section 9.1(d)(ii),
  CILCORP shall pay AES within ten days in cash by wire transfer
  of same day funds a termination fee in an amount equal to the
  Acquisition Termination Fee.
  
                     (iii)     by written notice to AES after
  the 18-month anniversary of the date hereof, if all conditions
  to Closing have been satisfied, other than the issuance of the
  SEC Exemption Order and CILCORP delivers to AES a certificate
  signed by an executive officer of CILCORP attesting to the
  satisfaction by CILCORP of the conditions in Sections 8.1 and
  8.3(a), (b), (c), (d) and (k) (the "Section 9.1(d)
  Certificate") then within 10 business days of the receipt of
  the Section 9.1(d) Certificate, AES shall pay to CILCORP in
  cash by wire transfer of same day funds within ten business
  days of such termination notice a termination fee in an amount
  equal to the Regulatory Termination Fee.
  
                     (iv) without payment of a termination fee
  by AES or CILCORP, upon two business days' written notice to
  AES after the six-month anniversary of the date hereof if the
  Illinois Certification shall not have been issued or waived by
  AES prior to or within two business days after the time such
  notice is given.
  
           Section 9.2    Effect of Termination.  In the event
  of termination of this Agreement by either CILCORP or AES
  pursuant to Section 9.1, there shall be no liability on the
  part of either CILCORP or AES or their respective officers or
  directors hereunder, except that Section 7.8, Section 9.1,
  Section 9.2 and Section 9.3, the agreement contained in the
  last sentence of Section 7.1 and in Section 10.6 shall survive
  the termination.
  
           Section 9.3    Termination Fees; Expenses.
  
                (a)  Expenses.  The parties agree that the
  termination fees contained in Article IX are an integral part
  of the transactions contemplated by this Agreement and
  constitute liquidated damages and not a penalty.
  Notwithstanding anything to the contrary contained in this
  Agreement, if one party fails to promptly pay to the other any
  fee or expense due under Article IX, in addition to any
  amounts paid or payable pursuant to such Section, the party
  shall pay the costs and expenses (including legal fees and
  expenses) in connection with any action, including the filing
  of any lawsuit or other legal action, taken to collect
  payment, together with interest on the amount of any unpaid
  fee at the publicly announced prime rate of Citibank, N.A.
  from the date such fee was required to be paid.
  
                (b)  Limitation Of Fees.  Notwithstanding
  anything herein to the contrary, AES shall in no event be
  liable or required to pay to CILCORP more than one of (A) the
  Regulatory Termination Fee, (B) the Financing Termination Fee
  or (C) the AES Breach Termination Fee.
  
           Section 9.4    Amendment.  This Agreement may be
  amended by the Boards of Directors of the parties hereto, at
  any time before or after approval hereof by the stockholders
  of CILCORP and prior to the Effective Time, but after such
  approval, no such amendment shall (a) alter or change the Per
  Share Amount under Article II or (b) alter or change any of
  the terms and conditions of this Agreement if any of the
  alterations or changes, alone or in the aggregate, would
  materially adversely affect the rights of holders of CILCORP
  Common Stock, except for alterations or changes that could
  otherwise be adopted by the Board of Directors of CILCORP or
  AES, without the further approval of CILCORP stockholders.
  This Agreement may not be amended except by an instrument in
  writing signed on behalf of each of the parties hereto.
  
           Section 9.5    Waiver.  At any time prior to the
  Effective Time, the parties hereto may (a) extend the time for
  the performance of any of the obligations or other acts of the
  other parties hereto, (b) waive any inaccuracies in the
  representations and warranties contained herein or in any
  document delivered pursuant hereto and (c) waive compliance
  with any of the agreements or conditions contained herein, to
  the extent permitted by applicable law.  Any agreement on the
  part of a party hereto to any such extension or waiver shall
  be valid if set forth in an instrument in writing signed on
  behalf of such party.
  
  
                            ARTICLE X
  
                       GENERAL PROVISIONS
  
           Section 10.1   Non-Survival; Effect of
  Representations and Warranties.  No representations or
  warranties in this Agreement shall survive the Effective Time,
  except as otherwise provided in this Agreement.
  
           Section 10.2   Notices.  All notices and other
  communications hereunder shall be in writing and shall be
  deemed given (a) when delivered personally, (b) when sent by
  reputable overnight courier service or (c) when telecopied
  (which is confirmed by copy sent within one business day by a
  reputable overnight courier service) to the parties at the
  following addresses (or at such other address for a party as
  shall be specified by like notice):
  
                  (i)  If to AES or Merger Sub, to:

                     The AES Corporation
                     1001 North 19th Street, 20th Floor
                     Arlington, Virginia 22209
                     Attention:     General Counsel
                     Telephone:     703-522-1315
                     Facsimile:     703-528-4510
  
                     with a copy to:
  
                     Skadden, Arps, Slate, Meagher & Flom LLP
                     1440 New York Avenue, N.W.
                     Washington, DC  20005
                     Attention:     Michael P. Rogan, Esq.
                                    Marcia R. Nirenstein, Esq.
                     Telephone:     202-371-7000
                     Facsimile:     202-393-5760
  
                               and

                 (ii) if to CILCORP, to:
  
                     CILCORP Inc.
                     300 Hamilton Boulevard, Suite 300
                     Peoria, Illinois  61602
                     Attention:     John G. Sahn, Esq.
                     Telephone:     309-675-8822
                     Facsimile:     309-675-8888
  
                     with a copy to:
  
                     Winthrop, Stimson, Putnam & Roberts
                     One Battery Park Plaza
                     New York, New York  10004
                     Attention:     Stephen R. Rusmisel, Esq.
                     Telephone:     212-858-1000
                     Facsimile:     212-858-1500
  
           Section 10.3   Miscellaneous.  This Agreement (a)
  constitutes the entire agreement and supersedes all other
  prior agreements and understandings, both written and oral,
  among the parties, or any of them, with respect to the subject
  matter hereof (other than the Confidentiality Agreement), (b)
  shall not be assigned by operation of law or otherwise and (c)
  shall be governed by and construed in accordance with the laws
  of the State of New York applicable to contracts executed in
  and to be fully performed in such State, without giving effect
  to its conflicts of law rules or principles and except to the
  extent the provisions of this Agreement (including the
  documents or instruments referred to herein) are expressly
  governed by or derive their authority from the Illinois Act.
  
           Section 10.4   Interpretation.  When a reference is
  made in this Agreement to Sections or Exhibits, such reference
  shall be to a Section or Exhibit of this Agreement,
  respectively, unless otherwise indicated.  The table of
  contents and headings contained in this Agreement are for
  reference purposes only and shall not affect in any way the
  meaning or interpretation of this Agreement.  Whenever the
  words "include," "includes" or "including" are used in this
  Agreement, they shall be deemed to be followed by the words
  "without limitation."
  
           Section 10.5   Counterparts; Effect.  This Agreement
  may be executed in one or more counterparts, each of which
  shall be deemed to be an original, but all of which shall
  constitute one and the same agreement.
  
           Section 10.6   Enforcement.  The parties agree that
  irreparable damage would occur in the event that any of the
  provisions of this Agreement were not performed in accordance
  with their specific terms or were otherwise breached.  It is
  accordingly agreed that the parties shall be entitled to an
  injunction or injunctions to prevent breaches of this
  Agreement and to enforce specifically the terms and provisions
  of this Agreement in any court of the United States located in
  the State of New York or any New York state court in the
  County of New York, this being in addition to any other remedy
  to which they are entitled at law or in equity. In addition,
  each of the parties hereto (a) consents to submit itself to
  the personal jurisdiction of any federal court located in the
  State of New York or any New York state court in the County of
  New York in the event any dispute arises out of this Agreement
  or any of the transactions contemplated by this Agreement, (b)
  agrees that it will not attempt to deny such personal
  jurisdiction by motion or other request for leave from any
  such court and (c) agrees that it will not bring any action
  relating to this Agreement or any of the transactions
  contemplated by this Agreement in any court other than a
  federal court sitting in the State of New York or a New York
  state court sitting in the County of New York.
  
           Section 10.7   Parties in Interest.  This Agreement
  shall be binding upon and inure solely to the benefit of each
  party hereto, and, except for rights of Indemnified Parties as
  set forth in Section 7.5, nothing in this Agreement, express
  or implied, is intended to confer upon any other person any
  rights or remedies of any nature whatsoever under or by reason
  of this Agreement.
  
           Section 10.8   Further Assurances.  Each party will
  execute such further documents and instruments and take such
  further actions as may reasonably be requested by any other
  party in order to consummate the Merger in accordance with the
  terms hereof.
  
           Section 10.9   Waiver Of Jury Trial.  Each party to
  this Agreement waives, to the fullest extent permitted by
  applicable law, any right it may have to a trial by jury in
  respect of any action, suit or proceeding arising out of or
  relating to this Agreement.
  
           Section 10.10  Certain Definitions.  The term
  "affiliate," except where otherwise defined herein, shall
  mean, as to any person, any other person which directly or
  indirectly controls, or is under common control with, or is
  controlled by, such person.  The term "control" (including,
  with its correlative meanings, "controlled by" and "under
  common control with") shall mean possession, directly or
  indirectly, of power to direct or cause the direction of
  management or policies (whether through ownership of
  securities or partnership or other ownership interests, by
  contract or otherwise).
  
  
           IN WITNESS WHEREOF, AES, CILCORP and Merger Sub have
  caused this Agreement as of the date first written above to be
  signed by their respective officers thereunto duly authorized.
  
                             THE AES CORPORATION
  
  
                             By:  Thomas A. Tribone  
                                  Name:  Thomas A. Tribone
                                  Title:  Executive Vice President
  
  
  
                             CILCORP INC.
  
  
                             By:  Robert O. Viets
                                  Name:  Robert O. Viets
                                  Title:  President and Chief
                                          Executive Officer
  
  
  
                             MIDWEST ENERGY, INC.
  
  
                             By:  Thomas A. Tribone
                                  Name:  Thomas A. Tribone
                                  Title:  Executive Vice President




                                                      (Exhibit B)


                     AES TO ACQUIRE CILCORP
                                
   Establishes Midwest Base in Competitive Electricity Market

For Immediate Release

     PEORIA, IL.November 23, 1998.The AES Corporation (NYSE: AES)
and CILCORP Inc. (NYSE: CER) announced today that they have
agreed to terms of a definitive agreement under which AES will
acquire all of CILCORP's 13,610,680 common shares at a price of
$65 per share, or approximately $885 million.

     CILCORP, formed in 1985 and headquartered in Peoria, IL, is
an energy services company whose largest subsidiary, CILCO, is an
85-year-old gas and electric utility serving approximately a
quarter of a million retail customers in Central Illinois.  In
1997, CILCORP had consolidated revenues of $976 million and net
assets of $1.3 billion.  CILCORP and its subsidiaries currently
employ approximately 1,800 people.

     The transaction, under which CILCORP will become a wholly-
owned subsidiary of AES, requires the approval of CILCORP
shareholders and is subject to regulatory approvals by the
Federal Energy Regulatory Commission (FERC), the Illinois
Commerce Commission (ICC) and the Securities and Exchange
Commission (SEC).  The United States Department of Justice and
the Federal Trade Commission will also review the acquisition.

     The parties expect the transaction to be completed by mid
1999, subject to the previously mentioned approvals.

     Commenting on the rapid completion of the transaction and
benefits of AES as a partner, CILCORP President and CEO, Robert
O. Viets said, "The people of AES are committed to grow; they
have a business philosophy and ethics that are totally consistent
with ours.  This transaction brings our company the opportunities
of growth far more quickly than it could do on its own.  From an
investor perspective, the price offered represents a significant
premium to shareholders based upon recent market trading and
comparable utility acquisition transactions."

     Mr. Tom Tribone, Executive Vice President of AES, said,
"This combination brings together CILCORP, the most competitive
electric and gas supplier in Illinois, and AES, the largest
global power company.  It is important to note that Illinois has
enacted a far-sighted restructuring plan that embodies a vision
for the industry that is shared by both companies.  We believe
that the combined company, operating under this first-of-a-kind
structure, will be a model of how the electric and gas business
will be conducted in the United States in the 21st century."

     Mr. Dennis Bakke, President and CEO of AES, stated, "AES is
very pleased to become involved in the Illinois market.  We look
forward to working with the people of CILCORP, the local
communities, the ICC and CILCO's customers.  This transaction
gives us a strong base of operations in the midwestern United
States."

    For Additional Information, Contact:
    Gary Ebeling                      Ken Woodcock
    Director- Investor       or       Senior Vice
    Relations                         President
    CILCORP Inc.                      AES Corporation
    (309) 675-8810                    (703) 522-1315