CINCINNATI GAS & ELECTRIC CO
DEFS14A, 1996-08-20
ELECTRIC & OTHER SERVICES COMBINED
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<PAGE>
SCHEDULE 14A
                               (RULE 14A-101)
   
                INFORMATION REQUIRED IN PROXY STATEMENT
                                       
                         SCHEDULE 14A INFORMATION
                                       
    Proxy Statement Pursuant to Section 14(a) of the Securities
                   Exchange Act of 1934 (Amendment No.   )
 
Filed by the Registrant  /X/
 
Filed by a Party other than the Registrant  / /
 
Check the appropriate box:
 
/ /  Preliminary Proxy Statement
 
/ /  Confidential, for Use of the
     Commission Only (as permitted by
     Rule 14a-6(e)(2))
 
/X/  Definitive Proxy Statement
 
/ /  Definitive Additional Materials
 
/ /  Soliciting Material Pursuant to Sec. 240.14a-11(c) or 
     Sec. 240.14a-12
 
                    THE CINCINNATI GAS & ELECTRIC COMPANY
 .................................................................
 
                (Name of Registrant as Specified In Its Charter)
 
  
                    THE CINCINNATI GAS & ELECTRIC COMPANY
 .................................................................
 
(Name of Person(s) Filing Proxy Statement if other than the registrant)
 

Payment of Filing Fee (Check the appropriate box):
 
/ /  $125 per Exchange Act Rules 0-11(c)(1)(ii), 14a-6(i)(1), 
14a-6(i)(2) or Item 22(a)(2) of Schedule 14A.
 
/ /  $500 per each party to the controversy pursuant to Exchange Act Rule
14a-6(i)(3).
 
/ /  Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 
0-11.
 
  1) Title of each class of securities to which transaction applies:
 
   .......................................................................
 
  2) Aggregate number of securities to which transaction applies:
 
   .......................................................................
 
  3) Per unit price or other underlying value of transaction computed 
     pursuant to Exchange Act Rule 0-11 (Set forth the amount on which the 
     filing fee is calculated and state how it was determined):
 
   .......................................................................
 
  4) Proposed maximum aggregate value of transaction:
 
   .......................................................................
 
  5) Total fee paid:
 
   .......................................................................
 
/X/  Fee paid previously with preliminary materials.
 
/ /  Check box if any part of the fee is offset as provided by Exchange Act
Rule 0-11(a)(2) and identify the filing for which the offsetting fee was
paid previously. Identify the previous filing by registration statement
number, or the Form or Schedule and the date of its filing.
 
  1) Amount Previously Paid:
 
  ..........................
 
  2) Form, Schedule or Registration Statement No.:
 
  ..........................
 
  3) Filing Party:
 
  ..........................
 
  4) Date Filed:
 
  ..........................
 
<PAGE>

<PAGE>
OFFER TO PURCHASE AND PROXY STATEMENT
                                 CINERGY CORP.
                           OFFER TO PURCHASE FOR CASH
           ANY AND ALL OUTSTANDING SHARES OF THE FOLLOWING SERIES OF
      CUMULATIVE PREFERRED STOCK OF THE CINCINNATI GAS & ELECTRIC COMPANY
  270,000 SHARES, CUMULATIVE PREFERRED STOCK, 4% SERIES AT A PURCHASE PRICE OF
                                $64.00 PER SHARE
130,000 SHARES, CUMULATIVE PREFERRED STOCK, 4 3/4% SERIES AT A PURCHASE PRICE OF
                                $80.00 PER SHARE
800,000 SHARES, CUMULATIVE PREFERRED STOCK, 7 7/8% SERIES AT A PURCHASE PRICE OF
                               $116.00 PER SHARE
800,000 SHARES, CUMULATIVE PREFERRED STOCK, 7 3/8% SERIES AT A PURCHASE PRICE OF
                               $110.00 PER SHARE
                                ----------------
                     THE CINCINNATI GAS & ELECTRIC COMPANY
                                PROXY STATEMENT
        WITH RESPECT TO ITS COMMON STOCK AND CUMULATIVE PREFERRED STOCK
                               ------------------
 
    THE  OFFER AND  WITHDRAWAL RIGHTS  WILL EXPIRE AT  5:00 P.M.,  NEW YORK CITY
TIME, ON WEDNESDAY, SEPTEMBER 18, 1996, UNLESS THE OFFER IS EXTENDED.
                               ------------------
 
    Cinergy Corp., a  Delaware corporation ("Cinergy"),  invites the holders  of
each  series  of cumulative  preferred  stock listed  above  (each a  "Series of
Preferred," and the holder thereof a "Preferred Shareholder") of The  Cincinnati
Gas  & Electric  Company, an Ohio  corporation and direct  utility subsidiary of
Cinergy ("CG&E"), to tender any and all of their shares of a Series of Preferred
("Shares") for purchase  at the purchase  price per Share  listed above for  the
Shares  tendered, net to the  seller in cash, upon the  terms and subject to the
conditions set forth in this  Offer to Purchase and  Proxy Statement and in  the
accompanying  Letter of  Transmittal and  Proxy (which  together constitutes the
"Offer"). Cinergy will purchase all  Shares validly tendered and not  withdrawn,
upon  the terms and  subject to the conditions  of the Offer.  See "Terms of the
Offer -- Certain Conditions of the Offer"  and "Terms of the Offer --  Extension
of Tender Period; Termination; Amendments."
 
    THE  OFFER FOR  A SERIES  OF PREFERRED IS  NOT CONDITIONED  UPON ANY MINIMUM
NUMBER OF SHARES OF SUCH SERIES  OF PREFERRED BEING TENDERED AND IS  INDEPENDENT
OF  THE  OFFER  FOR  ANY  OTHER SERIES  OF  PREFERRED.  THE  OFFER,  HOWEVER, IS
CONDITIONED UPON,  AMONG  OTHER THINGS,  THE  PROPOSED AMENDMENT,  AS  DESCRIBED
BELOW,  BEING APPROVED  AND ADOPTED  AT THE SPECIAL  MEETING. SEE  "TERMS OF THE
OFFER -- CERTAIN CONDITIONS OF THE OFFER."
 
    Concurrently with the Offer,  the Board of Directors  of CG&E is  soliciting
proxies for use at the Special Meeting of Shareholders of CG&E to be held at its
principal  office, 139 East Fourth Street,  Cincinnati, Ohio 45202, on September
18, 1996,  or any  adjournment or  postponement of  such meeting  (the  "Special
Meeting").  The  Special Meeting  is being  held to  consider an  amendment (the
"Proposed  Amendment")  to  CG&E's   Amended  Articles  of  Incorporation   (the
"Articles")  which would remove  a provision of the  Articles that limits CG&E's
ability to issue unsecured debt. WHILE PREFERRED SHAREHOLDERS WHO WISH TO TENDER
THEIR SHARES  PURSUANT TO  THE OFFER  NEED NOT  VOTE IN  FAVOR OF  THE  PROPOSED
AMENDMENT,  THE OFFER IS CONDITIONED UPON  THE PROPOSED AMENDMENT BEING APPROVED
AND ADOPTED AT THE SPECIAL MEETING. IN ADDITION, PREFERRED SHAREHOLDERS HAVE THE
RIGHT TO VOTE FOR THE PROPOSED AMENDMENT REGARDLESS OF WHETHER THEY TENDER THEIR
SHARES. IF THE  PROPOSED AMENDMENT  IS APPROVED AND  ADOPTED, CG&E  WILL MAKE  A
SPECIAL  CASH  PAYMENT  IN THE  AMOUNT  OF  $1.00 PER  SHARE  TO  EACH PREFERRED
SHAREHOLDER WHO VOTED  IN FAVOR OF  THE PROPOSED AMENDMENT,  PROVIDED THAT  SUCH
SHARES   HAVE  NOT  BEEN  TENDERED  PURSUANT   TO  THE  OFFER.  THOSE  PREFERRED
SHAREHOLDERS WHO  VALIDLY TENDER  THEIR  SHARES WILL  BE  ENTITLED ONLY  TO  THE
PURCHASE PRICE PER SHARE LISTED ABOVE.
 
                                   IMPORTANT
 
    Any Preferred Shareholder desiring to accept the Offer and tender all or any
portion  of  his or  her Shares  should either  (i) request  his or  her broker,
dealer, commercial bank, trust company or nominee to effect the transaction  for
him  or her, or (ii) complete and sign  the Letter of Transmittal and Proxy or a
facsimile thereof,  in  accordance  with  the  instructions  in  the  Letter  of
Transmittal  and Proxy, mail or  deliver it and any  other required documents to
The Bank of New York (the  "Depositary"), and deliver the certificates for  such
Shares  to the Depositary,  along with the  Letter of Transmittal  and Proxy, or
tender such Shares pursuant to the  procedure for book-entry transfer set  forth
below under "Terms of the Offer -- Procedure for Tendering Shares," prior to the
Expiration  Date (as  defined below). A  Preferred Shareholder  whose Shares are
registered in the name  of a broker, dealer,  commercial bank, trust company  or
nominee  must contact  such broker,  dealer, commercial  bank, trust  company or
nominee if he or  she desires to tender  such Shares. Any Preferred  Shareholder
who  desires to  tender Shares  and whose certificates  for such  Shares are not
immediately available,  or  who  cannot  comply in  a  timely  manner  with  the
procedure  for book-entry transfer,  should tender such  Shares by following the
procedures for guaranteed delivery set forth below under "Terms of the Offer  --
Procedure for Tendering Shares."
 
    EACH  SERIES OF PREFERRED HAS  ITS OWN LETTER OF  TRANSMITTAL AND PROXY, AND
ONLY THE APPLICABLE LETTER OF TRANSMITTAL AND PROXY FOR SUCH SERIES OF PREFERRED
OR A NOTICE OF  GUARANTEED DELIVERY AND  PROXY MAY BE USED  TO TENDER SHARES  OF
SUCH SERIES OF PREFERRED.
                               ------------------
 
    NEITHER  CINERGY, CG&E,  THEIR RESPECTIVE  BOARDS OF  DIRECTORS, NOR  ANY OF
THEIR RESPECTIVE OFFICERS MAKES ANY RECOMMENDATION TO ANY PREFERRED  SHAREHOLDER
AS  TO WHETHER TO TENDER ANY OR ALL SHARES. EACH PREFERRED SHAREHOLDER MUST MAKE
HIS OR HER  OWN DECISION AS  TO WHETHER TO  TENDER SHARES AND,  IF SO, HOW  MANY
SHARES TO TENDER.
                               ------------------
 
    This  Offer  to  Purchase  and  Proxy Statement  is  first  being  mailed to
Preferred Shareholders on or about August 20, 1996.
                              --------------------
 
    Each Series  of  Preferred  is listed  and  traded  on The  New  York  Stock
Exchange,  Inc. (the "NYSE"). On August 15,  1996, the last reported sale prices
on the NYSE were  $58.75 for the  4% Series of Preferred  (on August 15,  1996),
$71.25  for the 4 3/4% Series of Preferred (on August 14, 1996), $108.75 for the
7 7/8% Series of Preferred (on May 31,  1996) and $105.50 for the 7 3/8%  Series
of  Preferred (on July 16,  1996). Preferred Shareholders are  urged to obtain a
current market quotation,  if available,  for the  Shares. On  August 20,  1996,
there  were issued and outstanding 270,000 Shares of the 4% Series of Preferred,
130,000 Shares of the 4 3/4% Series  of Preferred, 800,000 Shares of the 7  7/8%
Series of Preferred and 800,000 Shares of the 7 3/8% Series of Preferred.
                               ------------------
 
    Questions  or requests for assistance or for additional copies of this Offer
to Purchase  and Proxy  Statement, the  Letter of  Transmittal and  Proxy for  a
Series  of Preferred, or other tender  offer or proxy solicitation materials may
be directed  to MacKenzie  Partners,  Inc. (the  "Information Agent")  or  Smith
Barney  Inc. and  Morgan Stanley &  Co. Incorporated (the  "Dealer Managers") at
their respective addresses and telephone numbers set forth on the back cover  of
this Offer to Purchase and Proxy Statement.
                               ------------------
                     The Dealer Managers for the Offer are:
SMITH BARNEY INC.  MORGAN STANLEY & CO.
                          INCORPORATED
                              --------------------
 
The date of this Offer to Purchase and Proxy Statement is August 20, 1996.
<PAGE>
    NO  PERSON  HAS BEEN  AUTHORIZED  TO MAKE  ANY  RECOMMENDATION ON  BEHALF OF
CINERGY OR  CG&E  AS TO  WHETHER  PREFERRED SHAREHOLDERS  SHOULD  TENDER  SHARES
PURSUANT  TO THE OFFER. NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR
TO MAKE  ANY REPRESENTATIONS  IN  CONNECTION WITH  THE  OFFER OTHER  THAN  THOSE
CONTAINED  HEREIN OR IN THE RELATED LETTER OF TRANSMITTAL AND PROXY. IF GIVEN OR
MADE, SUCH RECOMMENDATION AND SUCH  INFORMATION AND REPRESENTATIONS MUST NOT  BE
RELIED UPON AS HAVING BEEN AUTHORIZED BY CINERGY OR CG&E.
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                                PAGE
                                                                                                             -----------
<S>                                                                                                          <C>
SUMMARY....................................................................................................           2
TERMS OF THE OFFER.........................................................................................           4
  Number of Shares; Purchase Prices; Expiration Date; Dividends............................................           4
  Procedure for Tendering Shares...........................................................................           4
  Withdrawal Rights........................................................................................           6
  Acceptance of Shares for Payment and Payment of Purchase Price and Dividends.............................           7
  Certain Conditions of the Offer..........................................................................           7
  Extension of Tender Period; Termination; Amendments......................................................           9
PROPOSED AMENDMENT AND PROXY SOLICITATION..................................................................          10
  Introduction.............................................................................................          10
  Voting Securities, Rights and Procedures.................................................................          10
  Proxies..................................................................................................          10
  Cash Payments............................................................................................          11
  Security Ownership of Certain Beneficial Owners and Management...........................................          11
  Business to come before the Special Meeting..............................................................          12
  Explanation of the Proposed Amendment....................................................................          12
  Reasons for the Proposed Amendment.......................................................................          13
  Financial and Other Information Relating to CG&E.........................................................          14
  Relationship with Independent Public Accountants.........................................................          14
PRICE RANGE OF SHARES; DIVIDENDS...........................................................................          14
PURPOSE OF THE OFFER; CERTAIN EFFECTS OF THE OFFER.........................................................          16
CERTAIN FEDERAL INCOME TAX CONSEQUENCES....................................................................          17
SOURCE AND AMOUNT OF FUNDS.................................................................................          18
TRANSACTIONS AND AGREEMENTS CONCERNING THE SHARES..........................................................          19
FEES AND EXPENSES ASSOCIATED WITH THE OFFER................................................................          19
CERTAIN INFORMATION REGARDING CINERGY AND CG&E.............................................................          19
SUMMARY OF CONSOLIDATED FINANCIAL INFORMATION..............................................................          21
ADDITIONAL INFORMATION REGARDING CINERGY...................................................................          22
MISCELLANEOUS..............................................................................................          22
</TABLE>
 
                                       1
<PAGE>
                                    SUMMARY
 
    THE  FOLLOWING  SUMMARY  IS  PROVIDED  SOLELY  FOR  THE  CONVENIENCE  OF THE
PREFERRED SHAREHOLDERS.  THIS SUMMARY  IS NOT  INTENDED TO  BE COMPLETE  AND  IS
QUALIFIED  IN  ITS ENTIRETY  BY REFERENCE  TO  THE FULL  TEXT AND  MORE SPECIFIC
DETAILS CONTAINED IN THE OFFER AND ANY AMENDMENTS HERETO. PREFERRED SHAREHOLDERS
ARE URGED TO READ THIS OFFER IN ITS ENTIRETY. EACH OF THE CAPITALIZED TERMS USED
IN THIS SUMMARY AND NOT  DEFINED HEREIN HAS THE  MEANING SET FORTH ELSEWHERE  IN
THIS OFFER TO PURCHASE AND PROXY STATEMENT.
 
<TABLE>
<S>                                 <C>
The Companies.....................  Cinergy is a registered holding company under the Public
                                    Utility  Holding  Company  Act  of  1935  (the  "Holding
                                    Company Act"), and  is the parent  company of CG&E,  PSI
                                    Energy,  Inc. ("PSI"), Cinergy  Services, Inc. ("Cinergy
                                    Services")  and  Cinergy  Investments,  Inc.   ("Cinergy
                                    Investments").  CG&E is  an operating  utility primarily
                                    engaged in  providing electric  and gas  service in  the
                                    southwestern  portion of Ohio and, through its principal
                                    subsidiary, The  Union  Light, Heat  and  Power  Company
                                    ("ULH&P"),  in  adjacent areas  in  Kentucky. PSI  is an
                                    operating  utility   primarily  engaged   in   providing
                                    electric service in north central, central, and southern
                                    Indiana.  Cinergy  Services provides  management, finan-
                                    cial,  administrative,  engineering,  legal  and   other
                                    services   to   Cinergy,  CG&E,   PSI   Energy,  Cinergy
                                    Investments and subsidiaries  thereof. Cinergy  conducts
                                    its  non-utility businesses  through Cinergy Investments
                                    and its subsidiaries.
The Shares........................  CG&E 4% Cumulative Preferred Stock ($100 par value)
                                    CG&E 4 3/4% Cumulative Preferred Stock ($100 par value)
                                    CG&E 7 7/8% Cumulative Preferred Stock ($100 par value)
                                    CG&E 7 3/8% Cumulative Preferred Stock ($100 par value)
The Offer.........................  Offer to purchase any  or all shares  of each Series  of
                                    Preferred at the price per Share set forth below.
Purchase Price....................  $64.00 per 4% Share
                                    $80.00 per 4 3/4% Share
                                    $116.00 per 7 7/8% Share
                                    $110.00 per 7 3/8% Share
Independent Offer.................  The  Offer for one Series of Preferred is independent of
                                    the Offer for any other  Series of Preferred. The  Offer
                                    is  not conditioned upon any minimum number of Shares of
                                    the applicable Series of  Preferred being tendered,  but
                                    is   conditioned  upon  the   Proposed  Amendment  being
                                    approved and adopted at  the Special Meeting. The  Offer
                                    is subject to certain other conditions.
Expiration Date of the Offer......  The  Offer expires at 5:00 p.m.,  New York City time, on
                                    Wednesday, September  18,  1996,  unless  extended  (the
                                    "Expiration Date").
How to Tender Shares..............  See  "Terms  of  the Offer  --  Procedure  for Tendering
                                    Shares." For further  information, call the  Information
                                    Agent  or the Dealer Managers or consult your broker for
                                    assistance.
Withdrawal Rights.................  Tendered Shares  of  any  Series  of  Preferred  may  be
                                    withdrawn  at any  time until  the Expiration  Date with
                                    respect  to  such  Series   of  Preferred  and,   unless
                                    theretofore  accepted for payment, may also be withdrawn
                                    after Tuesday, October 15, 1996. See "Terms of the Offer
                                    -- Withdrawal Rights."
Purpose of the Offer..............  Cinergy is making the Offer because it believes that the
                                    purchase  of  Shares  is  attractive  to  Cinergy,   its
                                    shareholders and CG&E. In
</TABLE>
 
                                       2
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    addition,  the  Offer gives  Preferred  Shareholders the
                                    opportunity to sell their Shares  at a premium over  the
                                    market  price  and without  the usual  transaction costs
                                    associated with  a  market  sale. See  "Purpose  of  the
                                    Offer; Certain Effects of the Offer."
Dividends.........................  A  regular quarterly dividend has  been declared on each
                                    Series of Preferred, payable on  October 1, 1996 to  the
                                    owners of record on September 3, 1996 (the "October 1996
                                    Dividend").  A tender and purchase of Shares pursuant to
                                    the Offer will  not deprive a  Preferred Shareholder  of
                                    his or her right to receive the October 1996 Dividend on
                                    Shares  held of  record on September  3, 1996. Tendering
                                    Preferred Shareholders  will  not  be  entitled  to  any
                                    dividends  in respect of any  later dividend periods (or
                                    any portion thereof).
Brokerage Commissions.............  Not payable by Preferred Shareholders.
Solicitation Fee..................  Cinergy will pay to each designated Soliciting Dealer  a
                                    solicitation  fee of  $1.50 per  Share (except  that for
                                    transactions for beneficial owners equal to or exceeding
                                    5,000 Shares,  Cinergy will  pay a  solicitation fee  of
                                    $1.25  per Share) for any  Shares tendered, accepted for
                                    payment and  paid for  pursuant to  the Offer.  However,
                                    Soliciting   Dealers   will   not  be   entitled   to  a
                                    solicitation fee for Shares  beneficially owned by  such
                                    Soliciting Dealer.
Proposed Amendment................  Concurrently  with the Offer, the  Board of Directors of
                                    CG&E is  soliciting  proxies  for  use  at  the  Special
                                    Meeting  of Shareholders of CG&E. The Special Meeting is
                                    being held to consider  an amendment to CG&E's  Articles
                                    which  would  remove  a  provision  that  limits  CG&E's
                                    ability to issue unsecured debt.
Special Cash Payment..............  Preferred Shareholders have  the right to  vote for  the
                                    Proposed  Amendment  regardless of  whether  they tender
                                    their Shares. If the Proposed Amendment is approved  and
                                    adopted by CG&E's shareholders, CG&E will make a special
                                    cash  payment  of  $1.00  per  Share  to  each Preferred
                                    Shareholder  who  voted   in  favor   of  the   Proposed
                                    Amendment,  provided  that  such  Shares  have  not been
                                    tendered pursuant to  the Offer. Preferred  Shareholders
                                    who validly tender their Shares will be entitled only to
                                    the  purchase price per Share  listed on the front cover
                                    of this Offer to Purchase and Proxy Statement.
Stock Transfer Tax................  Cinergy will pay or cause to be paid any stock  transfer
                                    taxes  with  respect to  the  sale and  transfer  of any
                                    Shares to it  or its  order pursuant to  the Offer.  See
                                    Instruction  6 of  the applicable  Letter of Transmittal
                                    and Proxy.  See "Terms  of the  Offer --  Acceptance  of
                                    Shares for Payment of Purchase Price and Dividends."
Payment Date......................  Promptly after the Expiration Date.
Further Information...............  Additional  copies of  this Offer to  Purchase and Proxy
                                    Statement and the applicable  Letter of Transmittal  and
                                    Proxy  may be obtained  by contacting MacKenzie Partners
                                    Inc., 156 Fifth  Avenue, New York,  NY 10010,  telephone
                                    (800)  322-2885 (toll-free) and  (212) 929-5500 (brokers
                                    and  dealers).  Questions  about  the  Offer  should  be
                                    directed  to  Smith  Barney Inc.  at  (800)  655-4811 or
                                    Morgan Stanley  &  Co. Incorporated  at  (800)  223-2440
                                    Extension 1965.
</TABLE>
 
                                       3
<PAGE>
                               TERMS OF THE OFFER
 
NUMBER OF SHARES; PURCHASE PRICES; EXPIRATION DATE; DIVIDENDS
 
    Upon  the terms and  subject to the  conditions described herein  and in the
applicable Letter of Transmittal  and Proxy, Cinergy will  purchase any and  all
Shares  that are validly tendered on or  prior to the applicable Expiration Date
(and not properly withdrawn in accordance with "Terms of the Offer -- Withdrawal
Rights") at the purchase price per Share listed on the front cover of this Offer
to Purchase and Proxy Statement  for the Shares tendered,  net to the seller  in
cash.  See "Terms of the Offer -- Certain Conditions of the Offer" and "Terms of
the Offer -- Extension of Tender Period; Termination."
 
    THE OFFER FOR  A SERIES  OF PREFERRED IS  NOT CONDITIONED  UPON ANY  MINIMUM
NUMBER  OF SHARES OF SUCH SERIES OF  PREFERRED BEING TENDERED AND IS INDEPENDENT
OF THE  OFFER  FOR  ANY  OTHER  SERIES OF  PREFERRED.  THE  OFFER,  HOWEVER,  IS
CONDITIONED  UPON,  AMONG OTHER  THINGS,  THE PROPOSED  AMENDMENT,  AS DESCRIBED
HEREIN, BEING APPROVED  AND ADOPTED AT  THE SPECIAL MEETING.  SEE "TERMS OF  THE
OFFER -- CERTAIN CONDITIONS OF THE OFFER."
 
    The  Offer is being sent to all persons in whose names Shares are registered
on the books of  CG&E on the Record  Date (as defined below)  and on August  15,
1996. Only a record holder of Shares on the Record Date may vote in person or by
proxy  at the  Special Meeting.  No record date  is fixed  for determining which
persons are permitted to tender Shares.  Any person who is the beneficial  owner
but not the record holder of Shares must arrange for the record transfer of such
Shares prior to tendering.
 
    With  respect to each Series of Preferred,  the Expiration Date is the later
of 5:00 p.m., New York City time, on Wednesday, September 18, 1996 or the latest
time and date to  which the Offer  with respect to such  Series of Preferred  is
extended.  Cinergy expressly reserves the right,  in its sole discretion, and at
any time and/or from time to time, to extend the period of time during which the
Offer for any Series of Preferred is  open, by giving oral or written notice  of
such  extension to the  Depositary, without extending the  period of time during
which the Offer for any other Series of Preferred is open. There is no assurance
whatsoever that Cinergy  will exercise  its right to  extend the  Offer for  any
Series of Preferred. If Cinergy decides, in its sole discretion, to decrease the
number  of Shares  of any  Series of  Preferred being  sought or  to increase or
decrease the consideration  offered in  the Offer to  holders of  any Series  of
Preferred  and, at the  time that notice  of such increase  or decrease is first
published, sent or given to  holders of such Series  of Preferred in the  manner
specified  herein, the Offer for such Series of Preferred is scheduled to expire
at any time earlier than the tenth  business day from the date that such  notice
is  first so  published, sent or  given, such  Offer will be  extended until the
expiration of  such  ten-business-day  period.  For purposes  of  the  Offer,  a
"business  day" means any day  other than a Saturday,  Sunday or federal holiday
and consists of the time period from 12:01 a.m. through 12:00 midnight, New York
City time.
 
    NO ALTERNATIVE, CONDITIONAL OR CONTINGENT TENDERS WILL BE ACCEPTED.
 
    The October 1996  Dividend has been  declared on each  Series of  Preferred,
payable  October 1, 1996 to owners of record  on September 3, 1996. A tender and
purchase  of  Shares  pursuant  to  the  Offer  will  not  deprive  a  Preferred
Shareholder  of his or her right to  receive the October 1996 Dividend on Shares
held of record on September 3,  1996. Tendering Preferred Shareholders will  not
be  entitled to any dividends  in respect of any  later dividend periods (or any
portion thereof).
 
PROCEDURE FOR TENDERING SHARES
 
    To tender Shares pursuant to the  Offer, the tendering owner of Shares  must
either:
 
        (a)  send to the  Depositary (at one  of its addresses  set forth on the
    back cover  of  this Offer  to  Purchase  and Proxy  Statement)  a  properly
    completed  and duly  executed Letter of  Transmittal and  Proxy or facsimile
    thereof, together  with  any required  signature  guarantees and  any  other
    documents  required by  the Letter of  Transmittal and Proxy  and either (i)
    certificates for the Shares to be tendered
 
                                       4
<PAGE>
    must be received by  the Depositary at  one of such  addresses or (ii)  such
    Shares  must be delivered pursuant to the procedures for book-entry transfer
    described herein (and a  confirmation of such delivery  must be received  by
    the Depositary), in each case by the Expiration Date; or
 
        (b)  comply  with  the  guaranteed  delivery  procedure  described under
    "Guaranteed Delivery Procedure" below.
 
    The Depositary will establish an account  with respect to the Shares at  The
Depository Trust Company and Philadelphia Depository Trust Company (collectively
referred  to as the "Book-Entry Transfer  Facilities") for purposes of the Offer
within two business  days after the  date of  this Offer to  Purchase and  Proxy
Statement,  and any financial institution that is a participant in the system of
any Book-Entry Transfer  Facility may make  delivery of Shares  by causing  such
Book-Entry  Transfer  Facility to  transfer  such Shares  into  the Depositary's
account in accordance with the procedures of such Book-Entry Transfer  Facility.
Although  delivery of Shares  may be effected  through book-entry transfer, such
delivery must  be  accompanied by  either  (i)  a properly  completed  and  duly
executed Letter of Transmittal and Proxy or facsimile thereof, together with any
required  signature  guarantees  and any  other  required documents  or  (ii) an
Agent's Message (as hereinafter defined) and,  in any case, must be received  by
the Depositary at one of its addresses set forth on the back cover of this Offer
to Purchase and Proxy Statement by the Expiration Date.
 
    The  term  "Agent's Message"  means  a message,  transmitted  by one  of the
Book-Entry Transfer Facilities, received by the Depositary and forming a part of
the book-entry  transfer when  a  tender is  initiated,  which states  that  the
Book-Entry  Transfer  Facility has  received  an express  acknowledgment  from a
participant tendering Shares that such participant has received and agrees to be
bound by the terms of the Letter  of Transmittal and Proxy and that Cinergy  may
enforce such agreement against such participant.
 
    Except   as  otherwise  provided  below,  all  signatures  on  a  Letter  of
Transmittal and  Proxy must  be guaranteed  by  a firm  that is  a member  of  a
registered   national  securities  exchange  or   the  National  Association  of
Securities Dealers, Inc.,  or by a  commercial bank or  trust company having  an
office  or  correspondent in  the  United States  that  is a  participant  in an
approved Signature  Guarantee Medallion  Program (each  of the  foregoing  being
referred to as an "Eligible Institution"). Signatures on a Letter of Transmittal
and  Proxy need not be guaranteed if (a)  the Letter of Transmittal and Proxy is
signed by the registered owner of  the shares tendered therewith and such  owner
has  not completed  the box entitled  "Special Payment Instructions"  or the box
entitled "Special Delivery Instructions" on the Letter of Transmittal and Proxy,
(b) such Shares are tendered for the  account of an Eligible Institution or  (c)
such  Letter of Transmittal  and Proxy is  being used solely  for the purpose of
voting  Shares  which  are  not  being  tendered  pursuant  to  the  Offer.  See
Instructions 1 and 5 of the Letter of Transmittal and Proxy.
 
    GUARANTEED DELIVERY PROCEDURE.  If a Preferred Shareholder desires to tender
Shares  pursuant to the Offer and  such Preferred Shareholder's certificates are
not immediately available or  the procedures for  book-entry transfer cannot  be
completed  on a timely basis  or time will not  permit all required documents to
reach the Depositary prior to the Expiration Date, such Shares may  nevertheless
be  tendered if all of the following guaranteed delivery procedures are complied
with:
 
        (i) such tender is made by or through an Eligible Institution;
 
        (ii) a  properly  completed  and  duly  executed  Notice  of  Guaranteed
    Delivery  and Proxy, substantially in the  form provided by Cinergy and CG&E
    herewith, is received (with any required signatures or signature guarantees)
    by the Depositary as provided below prior to the Expiration Date; and
 
       (iii) the  certificates  for  all  tendered Shares  in  proper  form  for
    transfer  or a Book-Entry Confirmation with  respect to all tendered Shares,
    together with a properly completed  and duly executed Letter of  Transmittal
    and  Proxy (or a manually signed  facsimile thereof) and any other documents
    required by  the  Letter of  Transmittal  and  Proxy, are  received  by  the
    Depositary  no later than 5:00  p.m., New York City  time, within three NYSE
    trading days after the date of such Notice of Guaranteed Delivery and Proxy.
 
                                       5
<PAGE>
    THE NOTICE OF  GUARANTEED DELIVERY  AND PROXY MAY  BE DELIVERED  BY HAND  OR
TRANSMITTED  BY  FACSIMILE TRANSMISSION  OR MAILED  TO  THE DEPOSITARY  AND MUST
INCLUDE AN ENDORSEMENT BY AN ELIGIBLE INSTITUTION IN THE FORM SET FORTH IN  SUCH
NOTICE OF GUARANTEED DELIVERY AND PROXY.
 
    In  all cases, Shares shall not be deemed validly tendered unless a properly
completed and  duly executed  Letter of  Transmittal and  Proxy (or  a  manually
signed  facsimile thereof) or, if applicable,  an Agent's Message is received by
the Depositary.
 
    Notwithstanding any other provision hereof, payment for Shares accepted  for
payment  pursuant  to the  Offer in  all cases  will be  made only  after timely
receipt by  the Depositary  of  certificates for  (or  an Agent's  Message  with
respect  to) such Shares, a Letter of Transmittal and Proxy or a manually signed
facsimile thereof,  properly  completed and  duly  executed, with  any  required
signature  guarantees  and  all  other  documents  required  by  the  Letter  of
Transmittal and Proxy.
 
    THE METHOD OF DELIVERY OF SHARES AND ALL OTHER REQUIRED DOCUMENTS IS AT  THE
OPTION  AND RISK OF THE TENDERING PREFERRED SHAREHOLDER. IF DELIVERY IS BY MAIL,
REGISTERED MAIL WITH RETURN RECEIPT REQUESTED, PROPERLY INSURED, IS RECOMMENDED.
BECAUSE IT IS THE  TIME OF RECEIPT,  NOT THE TIME  OF MAILING, WHICH  DETERMINES
WHETHER  A TENDER HAS  BEEN MADE PRIOR  TO THE EXPIRATION  DATE, SUFFICIENT TIME
SHOULD BE ALLOWED FOR DELIVERY.
 
    TO AVOID FEDERAL  INCOME TAX BACKUP  WITHHOLDING EQUAL TO  31% OF THE  GROSS
PAYMENTS  MADE PURSUANT TO THE OFFER,  EACH TENDERING PREFERRED SHAREHOLDER MUST
NOTIFY  THE  DEPOSITARY  OF   SUCH  PREFERRED  SHAREHOLDER'S  CORRECT   TAXPAYER
IDENTIFICATION   NUMBER  AND  PROVIDE  CERTAIN  OTHER  INFORMATION  BY  PROPERLY
COMPLETING AND  EXECUTING THE  SUBSTITUTE FORM  W-9 INCLUDED  IN THE  LETTER  OF
TRANSMITTAL  AND PROXY.  FOREIGN PREFERRED  SHAREHOLDERS MUST  SUBMIT A PROPERLY
COMPLETED FORM  W-8  IN  ORDER  TO  AVOID  THE  APPLICABLE  BACKUP  WITHHOLDING;
PROVIDED,   HOWEVER,  THAT  BACKUP   WITHHOLDING  WILL  NOT   APPLY  TO  FOREIGN
STOCKHOLDERS SUBJECT TO 30% (OR LOWER TREATY RATE) WITHHOLDING ON GROSS PAYMENTS
RECEIVED PURSUANT TO THE OFFER. SEE "CERTAIN FEDERAL INCOME TAX CONSEQUENCES."
 
    EACH PREFERRED  SHAREHOLDER IS  URGED TO  CONSULT WITH  HIS OR  HER OWN  TAX
ADVISOR REGARDING THE TAX CONSEQUENCES OF THE OFFER.
 
    All  questions as  to the  form of  documents and  the validity, eligibility
(including the time  of receipt)  and acceptance for  payment of  any tender  of
Shares  will  be  determined  by  Cinergy,  in  its  sole  discretion,  and  its
determination will be final and binding. Cinergy reserves the absolute right  to
reject  any or all  tenders of Shares that  (i) it determines  are not in proper
form or (ii)  the acceptance for  payment of or  payment for which  may, in  the
opinion  of Cinergy's counsel,  be unlawful. Cinergy  also reserves the absolute
right to waive  any defect  or irregularity  in any  tender of  Shares. None  of
Cinergy, the Dealer Managers, the Depositary, the Information Agent or any other
person  will be under any  duty to give notice of  any defect or irregularity in
tenders, nor shall any of them incur any liability for failure to give any  such
notice.
 
WITHDRAWAL RIGHTS
 
    Tenders  of Shares made pursuant  to the Offer may  be withdrawn at any time
prior to the Expiration Date.  Thereafter, such tenders are irrevocable,  except
that  they may be withdrawn after  Tuesday, October 15, 1996, unless theretofore
accepted for payment as provided in this Offer to Purchase and Proxy Statement.
 
    To be effective, a  written or facsimile  transmission notice of  withdrawal
must  be timely received by the Depositary, at one of its addresses set forth on
the back cover of this Offer to  Purchase and Proxy Statement, and must  specify
the name of the person who tendered the Shares to be withdrawn and the number of
Shares to be withdrawn. If the Shares to be withdrawn have been delivered to the
Depositary,  a  signed notice  of withdrawal  with  signatures guaranteed  by an
Eligible  Institution   (except  in   the  case   of  Shares   tendered  by   an
 
                                       6
<PAGE>
Eligible  Institution) must be submitted prior to the release of such Shares. In
addition, such notice must specify, in  the case of Shares tendered by  delivery
of certificates, the name of the registered owner (if different from that of the
tendering  Preferred Shareholder) and the serial numbers shown on the particular
certificates evidencing the  Shares to be  withdrawn or, in  the case of  Shares
tendered  by book-entry transfer, the  name and number of  the account at one of
the Book-Entry Transfer Facilities to be credited with the withdrawn Shares  and
the  name of the registered holder (if different from the name of such account).
Withdrawals may not be rescinded, and Shares withdrawn will thereafter be deemed
not validly tendered for purposes of the Offer. However, withdrawn Shares may be
re-tendered by again following one of the procedures described in "Terms of  the
Offer  -- Procedure for  Tendering Shares" at  any time prior  to the Expiration
Date.
 
    All questions as to the form and validity (including time of receipt) of any
notice of withdrawal will be determined by Cinergy, in its sole discretion,  and
its  determination  will  be final  and  binding.  None of  Cinergy,  the Dealer
Managers, the Depositary,  the Information  Agent or  any other  person will  be
under  any duty to give notification of any defect or irregularity in any notice
of withdrawal  or  will  incur  any  liability for  failure  to  give  any  such
notification.
 
ACCEPTANCE OF SHARES FOR PAYMENT AND PAYMENT OF PURCHASE PRICE AND DIVIDENDS
 
    Upon  the terms and subject to the  conditions of the Offer, and as promptly
as practicable after the Expiration Date,  Cinergy will accept for payment  (and
thereby  purchase)  and pay  for Shares  validly tendered  and not  withdrawn as
permitted in "Terms of  the Offer -- Withdrawal  Rights." In all cases,  payment
for  Shares accepted for payment pursuant to the Offer will be made promptly but
only after timely receipt by the Depositary of certificates for such Shares  (or
of  an  Agent's  Message), a  properly  completed  and duly  executed  Letter of
Transmittal and Proxy (or facsimile thereof) and any other required documents.
 
    For purposes  of the  Offer, Cinergy  will be  deemed to  have accepted  for
payment  (and  thereby  purchased)  Shares that  are  validly  tendered  and not
withdrawn as, if and when it gives  oral or written notice to the Depositary  of
its  acceptance for payment of such Shares.  Cinergy will pay for Shares that it
has purchased pursuant to  the Offer by depositing  the purchase price  therefor
with   the  Depositary,  which  will  act   as  agent  for  tendering  Preferred
Shareholders for the purpose of receiving payment from Cinergy and  transmitting
payment  to  tendering  Preferred  Shareholders.  Under  no  circumstances  will
interest be paid  on amounts  to be  paid to  tendering Preferred  Shareholders,
regardless of any delay in making such payment.
 
    Certificates for all Shares not validly tendered will be returned or, in the
case  of Shares tendered by book-entry transfer, such Shares will be credited to
an account  maintained  with a  Book-Entry  Transfer Facility,  as  promptly  as
practicable, without expense to the tendering Preferred Shareholder.
 
    If  certain events  occur, Cinergy may  not be obligated  to purchase Shares
pursuant to the  Offer. See "Terms  of the  Offer -- Certain  Conditions of  the
Offer."
 
    Cinergy  will pay or cause to be  paid any stock transfer taxes with respect
to the sale and transfer of any Shares to it or its order pursuant to the Offer.
If, however, payment of  the purchase price  is to be made  to any person  other
than  the registered owner, or if tendered  Shares are registered in the name of
any person other than  the person signing the  Letter of Transmittal and  Proxy,
the amount of any stock transfer taxes (whether imposed on the registered owner,
such  other person  or otherwise)  payable on  account of  the transfer  to such
person will be deducted from the purchase price unless satisfactory evidence  of
the payment of such taxes, or exemption therefrom, is submitted. See Instruction
6 of the accompanying Letter of Transmittal and Proxy.
 
CERTAIN CONDITIONS OF THE OFFER
 
    CINERGY  WILL NOT BE  REQUIRED TO ACCEPT  FOR PAYMENT OR  PAY FOR ANY SHARES
TENDERED IF THE PROPOSED  AMENDMENT IS NOT APPROVED  AND ADOPTED AT THE  SPECIAL
MEETING.  PREFERRED  SHAREHOLDERS  HAVE  THE  RIGHT  TO  VOTE  FOR  THE PROPOSED
AMENDMENT REGARDLESS  OF  WHETHER THEY  TENDER  THEIR SHARES.  IF  THE  PROPOSED
AMENDMENT  IS APPROVED AND  ADOPTED, CG&E WILL  MAKE A SPECIAL  CASH PAYMENT, AS
DESCRIBED HEREIN,  TO EACH  PREFERRED  SHAREHOLDER WHO  VOTED  IN FAVOR  OF  THE
PROPOSED    AMENDMENT,   PROVIDED    THAT   THEIR    SHARES   HAVE    NOT   BEEN
 
                                       7
<PAGE>
TENDERED PURSUANT TO THE OFFER.  PREFERRED SHAREHOLDERS WHO TENDER THEIR  SHARES
WILL  ONLY BE ENTITLED TO THE PURCHASE PRICE PER SHARE LISTED ON THE FRONT COVER
OF THIS OFFER TO PURCHASE AND PROXY STATEMENT.
 
    Notwithstanding any  other  provision of  the  Offer, Cinergy  will  not  be
required to accept for payment or pay for any Shares tendered, and may terminate
or  amend  the  Offer  or  may postpone  (subject  to  the  requirements  of the
Securities Exchange Act of 1934 [the  "Exchange Act"] for prompt payment for  or
return  of  Shares)  the  acceptance  for payment  of,  or  payment  for, Shares
tendered, if at any time after August 20, 1996, and at or before acceptance  for
payment of or payment for any Shares, any of the following shall have occurred:
 
        (a)  there shall have been threatened,  instituted or pending any action
    or  proceeding   by   any   government  or   governmental,   regulatory   or
    administrative  agency, authority or tribunal  or any other person, domestic
    or foreign, or  before any  court, authority,  agency or  tribunal that  (i)
    challenges  the acquisition of Shares pursuant  to the Offer or otherwise in
    any manner relates  to or  affects the Offer  or (ii)  could materially  and
    adversely  affect the business, condition  (financial or otherwise), income,
    operations or prospects of Cinergy and its subsidiaries taken as a whole, or
    otherwise materially impair in  any way the  contemplated future conduct  of
    the  business of Cinergy or any of its subsidiaries or materially impair the
    Offer's contemplated benefits to Cinergy;
 
        (b) there shall have  been any action threatened,  pending or taken,  or
    approval  withheld,  or any  statute, rule,  regulation, judgment,  order or
    injunction threatened,  proposed,  sought,  promulgated,  enacted,  entered,
    amended,  enforced or deemed to be applicable to the Offer or Cinergy or any
    of its subsidiaries, by  any legislative body,  court, authority, agency  or
    tribunal  that would or might directly or indirectly (i) make the acceptance
    for payment  of, or  payment  for, some  or all  of  the Shares  illegal  or
    otherwise  restrict or  prohibit consummation  of the  Offer, (ii)  delay or
    restrict the ability  of Cinergy, or  render Cinergy unable,  to accept  for
    payment  or pay for some  or all of the  Shares, (iii) materially impair the
    contemplated benefits of the Offer to Cinergy or (iv) materially affect  the
    business,   condition  (financial  or   otherwise),  income,  operations  or
    prospects of Cinergy  and its subsidiaries  taken as a  whole, or  otherwise
    materially impair in any way the contemplated future conduct of the business
    of Cinergy or any of its subsidiaries;
 
        (c) there shall have occurred (i) any significant decrease in the market
    price of the Shares or any change in the general political, market, economic
    or  financial conditions in  the United States  or abroad that  could have a
    material adverse  effect on  Cinergy's  business, operations,  prospects  or
    ability  to obtain  financing generally or  the trading in  the other equity
    securities of Cinergy, (ii) the declaration  of a banking moratorium or  any
    suspension  of payments  in respect  of banks  in the  United States  or any
    limitation on, or  any event that  might affect the  extension of credit  by
    lending  institutions in the  United States, (iii)  the commencement of war,
    armed hostilities or  other international or  national calamity directly  or
    indirectly  involving  the United  States,  (iv) any  general  suspension of
    trading in,  or  limitation  on  prices  for,  securities  on  any  national
    securities  exchange or in  the over-the-counter market, (v)  in the case of
    any of the foregoing existing at the time of the commencement of the  Offer,
    a  material acceleration or worsening thereof  or (vi) any decline in either
    the Dow Jones Industrial  Average or the Standard  and Poor's Composite  500
    Stock  Index  by an  amount  in excess  of 15%  measured  from the  close of
    business on August 15, 1996;
 
        (d) any tender  or exchange offer  with respect  to some or  all of  the
    Shares  (other than the  Offer), or a merger,  acquisition or other business
    combination proposal for  Cinergy, shall  have been  proposed, announced  or
    made by any person or entity;
 
        (e) there shall have occurred any event or events that have resulted, or
    may  result, in  an actual or  threatened change in  the business, condition
    (financial or otherwise), income,  operations, stock ownership or  prospects
    of Cinergy and its subsidiaries; or
 
                                       8
<PAGE>
        (f)  the  Securities  and  Exchange Commission  (the  "SEC")  shall have
    withheld approval, under the Holding Company Act, of the acquisition of  the
    Shares  by Cinergy pursuant to the Offer or the approval and adoption of the
    Proposed Amendment at the Special Meeting;
 
    and, in  the  sole  judgment  of  Cinergy, such  event  or  events  make  it
undesirable or inadvisable to proceed with the Offer or with such acceptance for
payment or payment. With respect to the approval of the SEC referenced in clause
(f)  above, the SEC must  find that the acquisition of  the Shares by Cinergy is
not detrimental  to the  public interest  or the  interest of  the investors  or
consumers,  and that the  consideration paid in  connection with the acquisition
and the  adoption of  the Proposed  Amendment, including  fees, commissions  and
other remuneration, is reasonable.
 
    The   foregoing  conditions  (including  the  condition  that  the  Proposed
Amendment be  approved and  adopted at  the Special  Meeting) are  for the  sole
benefit   of  Cinergy  and  may  be   asserted  by  Cinergy  regardless  of  the
circumstances (including any action or inaction  by Cinergy) giving rise to  any
such  condition, and any such condition may be waived by Cinergy, in whole or in
part, at any time and from time to  time in its sole discretion. The failure  by
Cinergy  at any time to exercise any of the foregoing rights shall not be deemed
a waiver of any such right and each such right shall be deemed an ongoing  right
which  may be asserted at  any time and from time  to time. Any determination by
Cinergy concerning the events described above  will be final and binding on  all
parties.
 
EXTENSION OF TENDER PERIOD; TERMINATION; AMENDMENTS
 
    Cinergy  expressly reserves  the right, in  its sole discretion,  and at any
time and/or from time  to time, to  extend the period of  time during which  the
Offer  for any Series of  Preferred is open by giving  oral or written notice of
such extension to the  Depositary, without extending the  period of time  during
which  the Offer  for any  other Series of  Preferred is  open. There  can be no
assurance, however, that Cinergy will exercise its right to extend the Offer for
any Series of Preferred.  During any such extension,  all Shares of the  subject
Series of Preferred previously tendered will remain subject to the Offer, except
to  the extent that such Shares  may be withdrawn as set  forth in "Terms of the
Offer -- Withdrawal Rights." Cinergy also  expressly reserves the right, in  its
sole  discretion, to terminate the  Offer and not accept  for payment or pay for
any Shares tendered, subject to Rule  13e-4(f)(5) under the Exchange Act,  which
requires Cinergy either to pay the consideration offered or to return the Shares
tendered  promptly after  the termination or  withdrawal of the  Offer, upon the
occurrence of any of the conditions specified in "Terms of the Offer --  Certain
Conditions of the Offer" by giving oral or written notice of such termination to
the Depositary, and making a public announcement thereof.
 
    Subject  to  compliance with  applicable law,  Cinergy further  reserves the
right, in its sole discretion, to amend the Offer in any respect. Amendments  to
the  Offer may be made at  any time and/or from time  to time effected by public
announcement thereof, such  announcement, in  the case  of an  extension, to  be
issued  no later than  9:00 a.m., New York  City time, on  the next business day
after the previously  scheduled Expiration  Date. Any  public announcement  made
pursuant  to the Offer  will be disseminated  promptly to Preferred Shareholders
affected thereby  in  a manner  reasonably  designed to  inform  such  Preferred
Shareholders  of such change.  Without limiting the manner  in which Cinergy may
choose to make  a public  announcement, except  as required  by applicable  law,
Cinergy  shall have no obligation to publish, advertise or otherwise communicate
any such public announcement  other than by  making a release  to the Dow  Jones
News Service.
 
    If  Cinergy materially  changes the  terms of  the Offer  or the information
concerning the Offer, or if it waives a material condition of the Offer, Cinergy
will  extend  the  Offer  to  the  extent  required  by  Rules  13e-4(d)(2)  and
13e-4(e)(2)  under the Exchange Act. Those rules require that the minimum period
during which an offer must remain  open following material changes in the  terms
of  the offer or information concerning the  offer (other than a change in price
or change  in percentage  of securities  sought) will  depend on  the facts  and
circumstances,  including the relative materiality of such terms or information.
The SEC has stated that, in its view, an offer should remain open for a  minimum
of  five business days from the date that  a notice of such a material change is
first published, sent or given. If the Offer is scheduled to expire at any  time
earlier  than the expiration of a period  ending on the tenth business day from,
and including, the date
 
                                       9
<PAGE>
that Cinergy publishes, sends or gives  to Preferred Shareholders a notice  that
it  will  (a) increase  or decrease  the price  it  will pay  for Shares  or (b)
decrease the percentage of Shares it seeks, the Offer will be extended until the
expiration of such period of ten business days.
 
                   PROPOSED AMENDMENT AND PROXY SOLICITATION
 
INTRODUCTION
 
    This Offer to Purchase and Proxy Statement is first being mailed on or about
August 20, 1996 to the shareholders of CG&E in connection with the  solicitation
of  proxies by  the Board  of Directors  (the "Board")  of CG&E  for use  at the
Special Meeting. At the Special Meeting, the shareholders of CG&E will vote upon
the Proposed Amendment to the Articles.
 
    While Preferred Shareholders who wish to tender their Shares pursuant to the
Offer need not vote in favor of the Proposed Amendment, the Offer is conditioned
upon the Proposed Amendment being approved  and adopted at the Special  Meeting.
In  addition, Preferred  Shareholders have  the right  to vote  for the Proposed
Amendment regardless  of  whether they  tender  their Shares.  If  the  Proposed
Amendment  is  approved and  adopted by  CG&E's shareholders,  CG&E will  make a
special cash payment in the  amount of $1.00 per  Share (the "Cash Payment")  to
each  Preferred  Shareholder  who  voted in  favor  of  the  Proposed Amendment,
provided that such Shares  have not been  tendered pursuant to  the Offer. If  a
Preferred  Shareholder votes  against the  Proposed Amendment  or abstains, such
Preferred Shareholder shall not be entitled  to the Cash Payment (regardless  of
whether  the  Proposed  Amendment  is  approved  and  adopted).  Those Preferred
Shareholders who  validly tender  their  Shares will  be  entitled only  to  the
purchase price per Share listed on the front cover of this Offer to Purchase and
Proxy Statement.
 
VOTING SECURITIES, RIGHTS AND PROCEDURES
 
    Only  holders of record of CG&E's voting securities at the close of business
on July 22, 1996 (the  "Record Date") will be entitled  to vote in person or  by
proxy  at the  Special Meeting.  The outstanding  voting securities  of CG&E are
divided into two classes: common stock and cumulative preferred stock. The class
of cumulative preferred stock  has been issued in  the four Series of  Preferred
with  the record holders of all Shares  of the cumulative preferred stock voting
together as one class.  The shares outstanding  as of the  Record Date, and  the
vote to which each share is entitled in consideration of the Proposed Amendment,
are as follows:
 
<TABLE>
<CAPTION>
                                                                                           VOTES PER
CLASS                                                                SHARES OUTSTANDING      SHARE
- -------------------------------------------------------------------  ------------------  --------------
<S>                                                                  <C>                 <C>
Common Stock (Par Value $8.50 per share)...........................       89,663,086         1 vote
Cumulative Preferred Stock (Par Value $100 per Share)..............        2,000,000         1 vote
</TABLE>
 
    The  affirmative vote of the holders of two-thirds of the outstanding shares
of each of  CG&E's (i)  common stock and  (ii) cumulative  preferred stock,  all
series  voting  together  as one  class,  is  required to  approve  the Proposed
Amendment to be presented  at the Special Meeting.  Abstentions and broker  non-
votes  will have the effect of votes against the Proposed Amendment. CINERGY HAS
ADVISED CG&E THAT IT  INTENDS TO VOTE  ALL OF THE  OUTSTANDING SHARES OF  COMMON
STOCK OF CG&E IN FAVOR OF THE PROPOSED AMENDMENT.
 
    Votes  at  the  Special  Meeting  will  be  tabulated  preliminarily  by the
Depositary. Inspectors of Election, duly  appointed by the presiding officer  of
the  Special  Meeting,  will  definitively  count  and  tabulate  the  votes and
determine and  announce the  results at  the meeting.  CG&E has  no  established
procedure  for  confidential  voting.  There  are  no  rights  of  appraisal  in
connection with the Proposed Amendment.
 
PROXIES
 
    THE ENCLOSED PROXY, WHICH IS CONTAINED WITHIN THE LETTER OF TRANSMITTAL  AND
PROXY  (AND THE NOTICE OF GUARANTEED DELIVERY AND PROXY), IS SOLICITED BY CG&E'S
BOARD, WHICH RECOMMENDS VOTING FOR THE PROPOSED AMENDMENT. ALL SHARES OF  CG&E'S
COMMON STOCK WILL BE VOTED IN ACCORDANCE WITH THE BOARD'S RECOMMENDATION. Shares
of  CG&E's cumulative preferred  stock represented by  properly executed proxies
received at or prior to the Special Meeting will be voted in accordance with the
instructions thereon. If  no instructions are  indicated, duly executed  proxies
will    be   voted    in   accordance    with   the    recommendation   of   the
 
                                       10
<PAGE>
Board. It is not anticipated that any  other matters will be brought before  the
Special  Meeting. However, the  enclosed proxy gives  discretionary authority to
the proxy holders  named therein should  any other matters  be presented at  the
Special  Meeting, and  it is the  intention of the  proxy holders to  act on any
other matters in accordance with their best judgment.
 
    Execution of  a proxy  will not  prevent a  shareholder from  attending  the
Special  Meeting and voting in person. Any shareholder giving a proxy may revoke
it at any time before it is voted by delivering to the Secretary of CG&E written
notice of revocation bearing a later date  than the proxy, by delivering a  duly
executed  proxy bearing a  later date, or by  voting in person  by ballot at the
Special Meeting.
 
    CG&E will bear the cost  of the solicitation of  proxies by the Board.  CG&E
has  engaged MacKenzie Partners, Inc. to  act as Information Agent in connection
with the solicitation  of proxies  for a fee  of $12,500  plus reimbursement  of
reasonable  out-of-pocket  expenses. Proxies  will be  solicited  by mail  or by
telephone. In addition, officers and employees of CG&E may also solicit  proxies
personally or by telephone; such persons will receive no additional compensation
for  these services. The  Information Agent has  not been retained  to make, and
will not make, solicitations or recommendations in connection with the  Proposed
Amendment.  The Dealer Managers have not been retained to act in any capacity in
connection with the solicitation of proxies.
 
    CG&E has requested that brokerage houses and other custodians, nominees  and
fiduciaries forward solicitation materials to the beneficial owners of shares of
CG&E's  cumulative  preferred stock  held  of record  by  such persons  and will
reimburse such brokers and other fiduciaries for their reasonable  out-of-pocket
expenses incurred in connection therewith.
 
    The  solicitation of proxies has been approved  by the SEC under the Holding
Company Act.  An application  has been  filed  with the  SEC under  the  Holding
Company Act requesting approval of the Proposed Amendment and the acquisition of
the Shares by Cinergy pursuant to the Offer.
 
CASH PAYMENTS
 
    Subject  to the terms and conditions set forth in this Offer to Purchase and
Proxy Statement, if (but only if) the Proposed Amendment is approved and adopted
by the shareholders of  CG&E, CG&E will  make a Cash  Payment to each  Preferred
Shareholder who voted in favor of the Proposed Amendment, in person by ballot or
by  proxy, at the Special Meeting in the  amount of $1.00 for each Share held by
such Preferred Shareholder on the Record  Date which is so voted, provided  that
such  Shares have not been tendered pursuant to the Offer. CASH PAYMENTS WILL BE
MADE TO PREFERRED SHAREHOLDERS AS  OF THE RECORD DATE  (IF SUCH SHARES HAVE  NOT
BEEN  TENDERED PURSUANT  TO THE OFFER)  ONLY IN  RESPECT OF EACH  SHARE WHICH IS
VOTED FOR THE ADOPTION OF THE PROPOSED AMENDMENT; PROVIDED, HOWEVER, THAT  THOSE
PREFERRED  SHAREHOLDERS WHO VALIDLY TENDER THEIR SHARES WILL BE ENTITLED ONLY TO
THE PURCHASE PRICE PER SHARE LISTED ON THE FRONT COVER OF THIS OFFER TO PURCHASE
AND PROXY STATEMENT.  If the Proposed  Amendment is approved  and adopted,  Cash
Payments  will be paid out of CG&E's  general funds, promptly after the Proposed
Amendment shall have become effective.
 
    Only  Preferred   Shareholders  on   the  Record   Date  (or   their   legal
representatives  or  attorneys-in-fact)  are  entitled to  vote  at  the Special
Meeting and to receive Cash Payments from CG&E. Any beneficial holder of  Shares
who  is not the registered holder of such Shares as of the Record Date (as would
be the case for any beneficial owner whose Shares are registered in the name  of
such  holder's broker, dealer, commercial bank,  trust company or other nominee)
must arrange with  the record  Preferred Shareholder  to execute  and deliver  a
proxy  form on such beneficial owner's behalf.  If a beneficial holder of Shares
intends to attend the Special Meeting and vote in person, such beneficial holder
must obtain a legal proxy form from his or her broker, dealer, commercial  bank,
trust company or other nominee.
 
SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT
 
    As noted above, Cinergy owns all the outstanding common stock of CG&E.
 
                                       11
<PAGE>
    Pursuant  to Section  13(d) of  the Exchange  Act, a  beneficial owner  of a
security is  any person  who directly  or  indirectly has  or shares  voting  or
investment  power over such security. No person  or group is known by management
of CG&E to be the beneficial owner of more than 5% of CG&E's class of cumulative
preferred stock as of the Record Date.
 
    CG&E's directors and executive officers  do not beneficially own any  Shares
as  of the Record Date. The beneficial  ownership of Cinergy's common stock held
by each director, as well as directors and executive officers as a group, as  of
June 30, 1996, is set forth in the following table.
 
<TABLE>
<CAPTION>
                                                                             AMOUNT AND NATURE
NAME OF BENEFICIAL OWNER (1)                                            OF BENEFICIAL OWNERSHIP (2)
- -----------------------------------------------------------------  -------------------------------------
<S>                                                                <C>
Jackson H. Randolph..............................................              79,239 shares
James E. Rogers..................................................             264,979 shares
William J. Grealis...............................................              22,462 shares
All directors and executive officers as a group..................             732,372 shares
                                                                     (representing 0.47% of the class)
</TABLE>
 
- ------------------------
(1) No  individual listed beneficially owned more  than 0.17% of the outstanding
    shares of common stock of Cinergy.
 
(2) Includes shares which there is a right to acquire within 60 days pursuant to
    the exercise  of stock  options  in the  following  amounts: Mr.  Rogers  --
    189,403;  Mr. Grealis -- 20,000; and all directors and executive officers as
    a group -- 472,922.
 
BUSINESS TO COME BEFORE THE SPECIAL MEETING
 
    The following Proposed  Amendment to  CG&E's Articles  is the  only item  of
business expected to be presented at the Special Meeting:
 
    To remove in its entirety ARTICLE FOURTH, Clause 6-A(b), limiting CG&E's
    ability to issue unsecured indebtedness.
 
EXPLANATION OF THE PROPOSED AMENDMENT
 
    Without the consent of the holders of CG&E's cumulative preferred stock, the
Articles  currently prohibit the issuance or  assumption of any unsecured notes,
debentures or other securities  representing unsecured indebtedness (other  than
for  the  purpose of  refunding outstanding  unsecured  indebtedness or  for the
redemption or retirement  of outstanding shares  of stock ranking  prior to  the
cumulative  preferred stock with respect to the payment of dividends or upon the
dissolution, liquidation  or winding  up  of CG&E)  if, immediately  after  such
issuance or assumption, the total outstanding principal amount of all securities
representing unsecured debt (including unsecured securities then to be issued or
assumed)  would exceed 20% of the aggregate of (1) the total principal amount of
all outstanding secured debt of CG&E at the time of such issuance or  assumption
and (2) the capital and surplus of CG&E, as stated on CG&E's books. The Proposed
Amendment,  if adopted,  would eliminate in  its entirety clause  6-A(b), as set
forth below, from the Articles.
 
    Clause 6-A.
 
                                    * * * *
 
    "(b)  Issue  any  unsecured   notes,  debentures  or  other   securities
    representing  unsecured  indebtedness,  or  assume  any  such  unsecured
    securities,  for  purposes  other  than  the  refunding  of  outstanding
    unsecured indebtedness theretofore incurred or assumed by the Company or
    the  redemption  or  other  retirement of  outstanding  shares  of stock
    ranking prior  to the  Cumulative Preferred  Stock with  respect to  the
    payment  of dividends or upon the dissolution, liquidation or winding up
    of the Company, whether voluntary or involuntary, if, immediately  after
    such  issue or assumption,  the total principal  amount of all unsecured
    notes,   debentures   or   other   securities   representing   unsecured
    indebtedness  issued  or assumed  by  the Company  and  then outstanding
    (including unsecured  securities then  to be  issued or  assumed)  would
    exceed 20% of the aggregate of (i) the total
 
                                       12
<PAGE>
    principal  amount of all bonds and other securities representing secured
    indebtedness  issued  or  assumed  by   the  Company  and  then  to   be
    outstanding,  and (ii) the capital and surplus of the Company as then to
    be stated on the books of account of the Company;"
 
REASONS FOR THE PROPOSED AMENDMENT
 
    CG&E believes that regulatory, legislative and market developments will lead
to a more competitive environment in  the electric and gas utility industry.  As
competition  intensifies,  flexibility and  cost  leadership will  be  even more
crucial to success in the  future. Given that the  electric and gas industry  is
extremely  capital  intensive, controlling  and  minimizing financing  costs are
essential  ingredients  to   operating  effectively  in   the  new   competitive
environment.  It  is, therefore,  for those  two  reasons, flexibility  and cost
leadership, that you are being asked to vote in favor of the Proposed Amendment.
 
    CG&E believes that adoption of the Proposed Amendment is key to meeting  the
objectives  of flexibility and cost leadership.  If adopted, the amendment would
eliminate the current provision of CG&E's Articles that limits the total  amount
of  CG&E's unsecured indebtedness to  20% of the total  amount of CG&E's secured
indebtedness, plus  capital and  surplus.  Historically, CG&E's  debt  financing
generally has been accomplished through the issuance of long-term first mortgage
bonds  and a  modest amount of  unsecured short-term debt.  First mortgage bonds
represent secured  indebtedness because  they  place a  first priority  lien  on
substantially  all of CG&E's  assets. The First  Mortgage Indenture between CG&E
and its  bondholders contains  certain restrictive  covenants with  respect  to,
among  other  things,  the  disposition  of  assets  and  the  ability  to issue
additional first mortgage bonds. Short-term  debt, usually the lowest cost  debt
available  to CG&E,  represents one  type of  unsecured indebtedness.  While the
Proposed Amendment  will  not only  allow  CG&E to  issue  a greater  amount  of
unsecured debt, it will also allow CG&E to issue a greater amount of total debt;
however,  CG&E presently has no  intention of issuing a  greater amount of total
debt than it  otherwise would have  issued absent the  adoption of the  Proposed
Amendment. It is, however, CG&E's intention to change the mix of debt securities
toward more issuances on a short-term and unsecured basis.
 
    Inasmuch  as  the  20% provision  contained  in the  Articles  limits CG&E's
flexibility in planning and financing its business activities, CG&E believes  it
ultimately  will  be  at a  competitive  disadvantage  if the  provision  is not
eliminated. The  industry's  new  competitors  (for  example,  power  marketers,
independent  power  producers  and cogenerating  facilities)  generally  are not
subject to  the type  of financing  restrictions the  Articles impose  on  CG&E.
Recently,  several other utilities with the same or similar charter restrictions
have successfully eliminated  such provisions by  soliciting their  shareholders
for   the  same  or  similar   amendments.  Therefore,  many  potential  utility
competitors,  and  even  CG&E's  Indiana  affiliate,  PSI,  have  no  comparable
provision  restricting the use of unsecured  debt. While CG&E's current low-cost
structure has been instrumental in reducing the ability of other competitors  to
attract  CG&E's large  bulk power customers,  CG&E must continue  to explore new
ways of  reducing  costs  and  enhancing flexibility.  CG&E  believes  that  the
adoption  of the  Proposed Amendment will  be in the  best long-term competitive
interests of shareholders by  enhancing its ability to  meet the two  objectives
described below.
 
    FINANCIAL FLEXIBILITY
 
    CG&E  believes  that  in  the  long run,  various  types  of  unsecured debt
alternatives  will  increase  in  importance  as  an  option  in  financing  its
construction  program and refinancing high-cost mortgage bonds. The availability
and flexibility  of  unsecured debt  is  necessary  to take  full  advantage  of
changing  conditions in securities markets. CG&E  intends to continue to rely on
unsecured debt up to the 20% maximum currently allowable under the Articles.  In
addition, although CG&E's earnings currently are sufficient to meet the earnings
coverage  tests that must be satisfied  before issuing additional first mortgage
bonds and preferred stock, there have  been periods, including virtually all  of
the  year 1994, when, because  of its inability to  meet the Articles test, CG&E
was unable to issue any additional preferred stock. A similar inability to issue
preferred stock in the future, combined  with the inability to issue  additional
unsecured  debt, would limit CG&E's financing options to either additional first
mortgage bonds  (assuming that  the  earnings coverage  test  could be  met)  or
additional common stock.
 
    CG&E's  use of  unsecured short-term  debt is  subject to  the 20% provision
contained in the Articles. CG&E  believes that the prudent  use of such debt  in
excess of this provision is vital to effective financial
 
                                       13
<PAGE>
management  of the business. Not only is unsecured short-term debt generally the
least expensive  form  of  capital,  it also  provides  flexibility  in  meeting
seasonal  fluctuations in cash requirements, acts  as a bridge between issues of
permanent capital and  can be used  when unfavorable conditions  prevail in  the
market for long-term capital.
 
    With  these benefits in mind, in 1995, CG&E sought and received the approval
of The Public Utilities Commission of Ohio (the "PUCO") to increase the  maximum
amount  of short-term debt it is permitted to have outstanding from $200 million
to $400 million. However, because of the 20% provision of the Articles, CG&E had
only $150 million of short-term debt capacity available, based on capitalization
as of June 30,  1996. Beyond that,  the amount of  short-term debt available  to
CG&E  will continue to decline as additional unsecured long- and short-term debt
is issued.
 
    LOWER COSTS
 
    As  previously  mentioned,  CG&E's   short-term  debt  issuances   generally
represent the lowest-cost form of financing. The corporate reorganization during
1994 resulted in the formation of Cinergy, a combined company that is larger and
financially  stronger than either CG&E  or PSI would have  been on a stand-alone
basis. Accordingly, CG&E has been able  to reassess its historically modest  use
of short-term debt. By increasing its use of short-term debt, it may be possible
for  CG&E to lower its cost structure  further, thereby making its products more
competitive, increasing earnings and reducing its business risks. However,  with
the  Articles' 20%  provision in  place and  with CG&E's  increasing reliance on
unsecured debt, the  availability and  concomitant benefits  of short-term  debt
diminish.  And although short-term debt, by  its nature, exposes the borrower to
potentially more volatility in interest rates, it should be noted that the  cost
of  short-term debt rarely exceeds the cost  of other forms of capital available
at the same time.
 
    IT IS  FOR  ALL  THE ABOVE  REASONS  THAT  CG&E'S BOARD  BELIEVES  THE  BEST
LONG-TERM  INTERESTS OF SHAREHOLDERS ARE  SERVED BY, AND ENCOURAGES SHAREHOLDERS
TO VOTE FOR, THE ADOPTION OF THE PROPOSED AMENDMENT.
 
FINANCIAL AND OTHER INFORMATION RELATING TO CG&E
 
    The financial statements  of CG&E  and related information  included in  its
Annual  Report  on Form  10-K  for the  year ended  December  31, 1995,  and its
Quarterly Reports on Form 10-Q  for the quarters ended  March 31, 1996 and  June
30, 1996, each as filed with the SEC, are hereby incorporated by reference. CG&E
will  provide without  charge, upon  the written or  oral request  of any person
(including any  beneficial owner)  to  whom this  Offer  to Purchase  and  Proxy
Statement is delivered, a copy of such information (excluding certain exhibits).
Such  requests for information should be  directed to CG&E's principal office at
139 East Fourth Street, Cincinnati, Ohio 45202, Attention: Corporate  Secretary;
telephone (513) 381-2000.
 
RELATIONSHIP WITH INDEPENDENT PUBLIC ACCOUNTANTS
 
    Upon  recommendation of the Audit Committee of Cinergy's board of directors,
such board  employed on  January 25,  1996 Arthur  Andersen LLP  as  independent
public  accountants for  Cinergy and its  subsidiaries, including  CG&E, for the
year 1996. Representatives of Arthur Andersen LLP are expected to be present  at
the  Special Meeting with the opportunity to  make a statement if they desire to
do so, and will be available to respond to appropriate questions.
 
                        PRICE RANGE OF SHARES; DIVIDENDS
 
    CG&E's Cumulative Preferred Stock  4% Series, 4 3/4%  Series, 7 7/8%  Series
and  7 3/8% Series are listed and traded  on the NYSE under the symbols "CIN-A,"
"CIN-B," "CIN-I" and "CIN-G," respectively. The last reported sale price on  the
NYSE,  as of the close of business on August 15, 1996, for each of the Series of
Preferred is  shown on  the front  cover of  this Offer  to Purchase  and  Proxy
Statement.
 
    PREFERRED  SHAREHOLDERS ARE  URGED TO  OBTAIN CURRENT  MARKET QUOTATIONS, IF
AVAILABLE, FOR THE SHARES.
 
                                       14
<PAGE>
    The following table sets forth the high and low sales prices of each  Series
of  Preferred on  the NYSE and  the cash  dividends paid thereon  for the fiscal
quarters indicated.
 
<TABLE>
<CAPTION>
                                          4% SERIES OF PREFERRED           4 3/4% SERIES OF PREFERRED
                                     ---------------------------------  ---------------------------------
                                                              CASH                               CASH
                                                            DIVIDENDS                          DIVIDENDS
                                       HIGH        LOW      PER SHARE     HIGH        LOW      PER SHARE
                                     ---------  ---------  -----------  ---------  ---------  -----------
<S>                                  <C>        <C>        <C>          <C>        <C>        <C>
1994
  1st Quarter......................  $  58.500  $  53.000   $   1.000   $  68.000  $  63.250   $   1.188
  2nd Quarter......................  $  56.000  $  52.000   $   1.000   $  65.000  $  61.500   $   1.188
  3rd Quarter......................  $  53.000  $  46.500   $   1.000   $  62.000  $  55.000   $   1.188
  4th Quarter......................  $  51.000  $  46.500   $   1.000   $  57.000  $  52.500   $   1.188
1995
  1st Quarter......................  $  50.500  $  47.000   $   1.000   $  59.000  $  52.500   $   1.188
  2nd Quarter......................  $  52.500  $  49.000   $   1.000   $  67.625  $  57.000   $   1.188
  3rd Quarter......................  $  56.000  $  51.500   $   1.000   $  67.000  $  64.000   $   1.188
  4th Quarter......................  $  58.500  $  53.500   $   1.000   $  72.500  $  64.000   $   1.188
1996
  1st Quarter......................  $  57.000  $  53.250   $   1.000   $  73.375  $  64.500   $   1.188
  2nd Quarter......................  $  56.000  $  50.500   $   1.000   $  67.000  $  63.500   $   1.188
</TABLE>
 
<TABLE>
<CAPTION>
                                    7 3/8% SERIES OF PREFERRED           7 7/8% SERIES OF PREFERRED
                                -----------------------------------  -----------------------------------
                                                           CASH                                 CASH
                                                         DIVIDENDS                            DIVIDENDS
                                   HIGH        LOW       PER SHARE      HIGH        LOW       PER SHARE
                                ----------  ----------  -----------  ----------  ----------  -----------
<S>                             <C>         <C>         <C>          <C>         <C>         <C>
1994
  1st Quarter.................  $  106.500  $  104.500   $   1.844   $  112.375  $  112.375   $   1.969
  2nd Quarter.................      *           *        $   1.844   $  106.875  $  106.500   $   1.969
  3rd Quarter.................      *           *        $   1.844       *           *        $   1.969
  4th Quarter.................      *           *        $   1.844   $  107.250  $  105.000   $   1.969
1995
  1st Quarter.................  $   94.250  $   93.797   $   1.844       *           *        $   1.969
  2nd Quarter.................  $  105.000  $  101.703   $   1.844       *           *        $   1.969
  3rd Quarter.................  $  104.500  $  104.031   $   1.844       *           *        $   1.969
  4th Quarter.................      *           *        $   1.844       *           *        $   1.969
1996
  1st Quarter.................      *           *        $   1.844   $  112.188  $  112.188   $   1.969
  2nd Quarter.................      *           *        $   1.844   $  108.750  $  108.750   $   1.969
</TABLE>
 
- ------------------------
* No trades reported on the NYSE.
 
    Dividends for a Series of Preferred are payable when, as and if declared  by
CG&E's  Board of Directors at  the rate per annum included  in such title of the
Series of Preferred  listed on the  front cover  of this Offer  to Purchase  and
Proxy  Statement. The October 1996 Dividend has  been declared on each Series of
Preferred, payable October 1, 1996 to owners  of record on September 3, 1996.  A
tender and purchase of Shares pursuant to the Offer will not deprive a Preferred
Shareholder  of his or her right to  receive the October 1996 Dividend on Shares
held of record on September 3,  1996. Tendering Preferred Shareholders will  not
be  entitled to any dividends  in respect of any  later dividend periods (or any
portion thereof).
 
                                       15
<PAGE>
               PURPOSE OF THE OFFER; CERTAIN EFFECTS OF THE OFFER
 
    Cinergy believes that the purchase of the Shares at this time represents  an
attractive opportunity that will benefit Cinergy, its shareholders, and CG&E. In
addition,  the Offer gives Preferred Shareholders  the opportunity to sell their
Shares at a premium to the market price  on the date of the announcement of  the
Offer and without the usual transaction costs associated with a sale.
 
    After  the  consummation of  the Offer,  Cinergy  may determine  to purchase
additional Shares  on the  open market,  in privately  negotiated  transactions,
through one or more tender offers or otherwise. Any such purchases may be on the
same terms as, or on terms which are more or less favorable to holders of Shares
than,  the terms of the Offer. However,  Rule 13e-4(f)(6) under the Exchange Act
prohibits Cinergy and its affiliates (including CG&E) from purchasing any Shares
of a Series of Preferred, other than  pursuant to the Offer, until at least  ten
business  days  after  the  Expiration  Date  with  respect  to  that  Series of
Preferred. Any  future purchases  of  Shares by  Cinergy  would depend  on  many
factors,  including  the  market price  of  the Shares,  Cinergy's  business and
financial position, restrictions on Cinergy's ability to purchase Shares imposed
by law  or  by  NYSE  listing  requirements  and  general  economic  and  market
conditions.
 
    Preferred  Shareholders  are  not  under  any  obligation  to  tender Shares
pursuant to the Offer. The Offer does not constitute notice of redemption of any
Series of Preferred pursuant to CG&E's Articles, nor does Cinergy or CG&E intend
to effect any such redemption by making the Offer. The Offer does not constitute
a waiver by CG&E  of any option it  has to redeem Shares.  The 7 3/8% Series  of
Preferred  is subject to mandatory redemption  in an amount sufficient to retire
on each August 1, beginning in 1998, and in each year thereafter, 40,000 Shares,
at a  price  of  $100 per  Share,  plus  accrued dividends,  and  CG&E  has  the
noncumulative option to redeem up to 40,000 additional Shares in each such year.
In  addition, the  7 3/8%  Series of Preferred  is redeemable,  upon call, after
August 1, 2002 at a price of $100 per Share, plus accrued dividends. The  entire
7 7/8% Series of Preferred is subject to mandatory redemption on January 1, 2004
at  a price of $100 per Share, plus accrued dividends. The Shares of each Series
of Preferred have no preemptive or conversion rights.
 
    Upon liquidation  or dissolution  of CG&E,  owners of  the Shares  would  be
entitled  to receive  an amount  equal to  the liquidation  preference per share
($100) plus all accrued and unpaid dividends (whether or not earned or declared)
thereon to the  date of  payment, prior  to the payment  of any  amounts to  the
holders of CG&E's common stock.
 
    Shares  validly tendered  to the  Depositary pursuant  to the  Offer and not
withdrawn in accordance with the procedures set forth herein shall be held until
the Expiration  Date (or  returned to  the  extent the  Offer is  terminated  in
accordance  herewith). To the extent that the Proposed Amendment is approved and
the Shares tendered are accepted for payment and paid for in accordance with the
terms hereof, Cinergy intends to transfer its Shares to CG&E and, at that  time,
it  is expected  that CG&E will  retire and  cancel the Shares.  However, in the
event the Proposed Amendment is not adopted at the Special Meeting, Cinergy  may
elect,  but  is  not  obligated,  to  waive,  subject  to  applicable  law, such
condition. In that  case, subsequent  to Cinergy's  waiver and  purchase of  the
Shares,  CG&E anticipates, as promptly as  practicable thereafter, that it would
call another special meeting of  its shareholders and solicit proxies  therefrom
for  an  amendment  substantially similar  to  the Proposed  Amendment.  At that
meeting, Cinergy would vote any Shares acquired  by it pursuant to the Offer  or
otherwise (together with its shares of common stock) in favor of such amendment,
thereby  maximizing the prospects for the  adoption of the amendment. Therefore,
if the  Proposed  Amendment (or  an  amendment similar  thereto)  is  ultimately
successful, it is likely that the Offer will reduce the number of Shares of each
of  the  Series  of Preferred  that  might  otherwise trade  publicly  or become
available for purchase and/or sale and  likely will reduce the number of  owners
of  Shares of each of the Series  of Preferred, which could adversely affect the
liquidity and sale value of the Shares not purchased in the Offer. Depending  on
the number of Shares tendered and purchased pursuant to the Offer, the Series of
Preferred may no longer meet the requirements of the NYSE for continued listing,
which  could adversely affect the market for the Shares. In addition, the Series
of Preferred are currently registered under  Section 12(g) of the Exchange  Act.
Registration  of the Shares  under the Exchange  Act may be  terminated upon the
application by CG&E to the  SEC if the Shares are  neither listed on a  national
securities exchange nor held by more than
 
                                       16
<PAGE>
300  holders  of record.  Termination of  registration of  the Shares  under the
Exchange Act would substantially reduce the information required to be furnished
to Preferred Shareholders and could make certain provisions of the Exchange  Act
no longer applicable to CG&E.
 
    Except  as disclosed in this Offer  to Purchase and Proxy Statement, Cinergy
and CG&E have no plans or proposals that  relate to or would result in: (a)  the
acquisition by any person of additional securities of CG&E or the disposition of
securities  of  CG&E;  (b) an  extraordinary  corporate transaction,  such  as a
merger,  reorganization  or   liquidation,  involving   CG&E  or   any  of   its
subsidiaries;  (c) a sale or transfer of a  material amount of assets of CG&E or
any of its subsidiaries; (d)  any change in the  present Board or management  of
CG&E;  (e)  any material  change  in the  present  dividend rate  or  policy, or
indebtedness or capitalization of CG&E; (f) any other material change in  CG&E's
corporate   structure  or  business;  (g)  any  change  in  CG&E's  Articles  or
Regulations or any actions that may impede the acquisition of control of CG&E by
any person; (h)  a class  of equity  securities of  CG&E being  delisted from  a
national  securities exchange; (i) a class of equity securities of CG&E becoming
eligible for termination  of registration  pursuant to Section  12(g)(4) of  the
Exchange  Act;  or  (j) the  suspension  of  CG&E's obligation  to  file reports
pursuant to Section 15(d) of the Exchange Act.
 
    NEITHER CINERGY,  CG&E, THEIR  RESPECTIVE BOARDS  OF DIRECTORS,  NOR ANY  OF
THEIR  RESPECTIVE OFFICERS MAKES ANY RECOMMENDATION TO ANY PREFERRED SHAREHOLDER
AS TO WHETHER TO TENDER ALL OR ANY SHARES. EACH PREFERRED SHAREHOLDER MUST  MAKE
HIS  OR HER OWN  DECISION AS TO  WHETHER TO TENDER  SHARES AND, IF  SO, HOW MANY
SHARES TO TENDER.
 
                    CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
    In the opinion of Taft, Stettinius  & Hollister, tax counsel to Cinergy  and
CG&E, the following summary describes the principal United States federal income
tax  consequences of sales  of Shares pursuant  to the Offer  and the receipt of
Cash Payments  in connection  with the  approval and  adoption of  the  Proposed
Amendment.  This  summary is  based on  the  Internal Revenue  Code of  1986, as
amended to the date hereof (the "Code"), administrative pronouncements, judicial
decisions and  existing and  proposed Treasury  Regulations, changes  to any  of
which  subsequent to the date of this  Offer to Purchase and Proxy Statement may
adversely  affect  the  tax  consequences   described  herein,  possibly  on   a
retroactive  basis.  This  summary is  addressed  to United  States  Holders, as
defined below, who hold Shares as  capital assets within the meaning of  Section
1221 of the Code. This summary does not discuss all of the tax consequences that
may  be relevant  to a  Holder in  light of  his particular  circumstances or to
Holders subject  to special  rules  (including certain  financial  institutions,
insurance  companies, dealers in  securities, Holders who  acquired their Shares
pursuant to the  exercise of  stock options or  other compensation  arrangements
with  CG&E, and Holders who are not citizens or residents of the United States).
Holders of  Shares  should  consult  their  tax  advisors  with  regard  to  the
application  of the  United States federal  income tax laws  to their particular
situations as well as any tax consequences arising under the laws of any  state,
local or foreign taxing jurisdiction.
 
    As  used herein, the term  "United States Holder" means  an owner of a Share
that (a) is  (i) for  United States  federal income  tax purposes  a citizen  or
resident  of the United States, (ii)  a corporation, partnership or other entity
created or  organized in  or under  the  laws of  the United  States or  of  any
political subdivision thereof or (iii) an estate or trust the income of which is
subject to United States federal income taxation regardless of its source or (b)
is  not described in (a) and whose  income from a Share is effectively connected
with such Holder's conduct of a United  States trade or business. The term  also
includes certain former citizens of the United States.
 
    TENDER OFFER
 
    A  United States Holder will recognize gain  or loss equal to the difference
between the tax basis of  his or her Shares and  the amount of cash received  in
exchange  therefor.  A United  States Holder's  gain or  loss will  be long-term
capital gain or loss if the holding period for the Shares is more than one  year
as  of the date of the sale of  such Shares. The excess of net long-term capital
gains over net short-term capital losses is taxed at
 
                                       17
<PAGE>
a lower  rate than  ordinary  income for  certain non-corporate  taxpayers.  The
distinction  between capital gain  or loss and  ordinary income or  loss is also
relevant for purposes of, among  other things, limitations on the  deductibility
of capital losses.
 
    CASH PAYMENTS/MODIFICATION
 
    Cash  Payments will be treated  as fees for voting  in favor of the Proposed
Amendment and  will  constitute  ordinary  income  to  recipient  United  States
Holders.  United States Holders, whether or not they receive Cash Payments, will
not recognize any taxable income or loss with respect to the Shares as a  result
of the modification of the Articles by the Proposed Amendment.
 
    BACKUP WITHHOLDING AND INFORMATION REPORTING
 
    Certain  noncorporate  United  States  Holders  may  be  subject  to  backup
withholding at  a  rate of  31%  on Cash  Payments.  Each United  States  Holder
entitled  to  receive a  Cash Payment  pursuant to  the Offer  will be  asked to
provide such Holder's  correct taxpayer identification  number and certify  that
such  Holder is not  subject to backup withholding  by completing the Substitute
Form W-9 included herewith.
 
    The amount  of any  backup withholding  from a  payment to  a United  States
Holder  will be allowed as a credit  against such Holder's United States federal
income tax liability and may entitle such Holder to a refund, provided that  the
required information is furnished to the Internal Revenue Service.
 
                           SOURCE AND AMOUNT OF FUNDS
 
    Assuming  that  Cinergy purchases  all  outstanding Shares  pursuant  to the
Offer, the total  amount required  by Cinergy to  purchase such  shares will  be
approximately  $208 million, exclusive of the  dividend payments, fees and other
expenses. Cinergy  intends to  use its  general funds  (which, in  the  ordinary
course,  include funds from  CG&E) and funds borrowed  pursuant to its revolving
credit agreement with a group of banks to purchase shares pursuant to the Offer.
This revolving credit agreement  currently extends to  May, 2001. The  borrowing
limit  of this facility,  applicable to the  transaction contemplated herein, is
$100 million. The  facility permits  Cinergy to  borrow funds  at a  fluctuating
interest  rate determined  by the  prime lending  market in  New York,  and also
permits Cinergy to borrow money for  fixed periods of time specified by  Cinergy
at fixed interest rates determined by the Eurodollar interbank market in London,
or  by offering its  banks the opportunity  to bid to  make loans at competitive
rates, at  Cinergy's option.  If  a material  adverse  change in  the  business,
operations,  affairs, assets or condition,  financial or otherwise, or prospects
of Cinergy and  its subsidiaries,  on a  consolidated basis,  should occur,  the
banks  may  decline to  lend additional  money to  Cinergy under  this revolving
credit agreement,  although  borrowings  outstanding  at the  time  of  such  an
occurrence would not then become due and payable.
 
                                       18
<PAGE>
               TRANSACTIONS AND AGREEMENTS CONCERNING THE SHARES
 
    Each  of Cinergy and  CG&E has been  advised by its  directors and executive
officers that no directors or executive officers of the respective companies own
any Shares. Based upon the companies'  records and upon information provided  to
each  company by its  directors and executive officers,  neither company nor, to
the knowledge  of either,  any of  their subsidiaries,  directors, or  executive
officers has engaged in any transactions involving Shares during the 40 business
days preceding the date hereof. Neither company nor, to the knowledge of either,
any  of  its  directors  or  executive officers  is  a  party  to  any contract,
arrangement, understanding or  relationship relating directly  or indirectly  to
the Offer with any other person with respect to any securities of CG&E.
 
                  FEES AND EXPENSES ASSOCIATED WITH THE OFFER
 
    DEALER   MANAGER  FEES.    Smith  Barney  Inc.  and  Morgan  Stanley  &  Co.
Incorporated will act  as Dealer  Managers for  Cinergy in  connection with  the
Offer,  but will not  provide services to  CG&E in connection  with the Proposed
Amendment or the solicitation  of proxies therewith. Cinergy  has agreed to  pay
each  Dealer Manager a combined fee of  $0.50 per Share for any Shares tendered,
accepted for payment  and paid for  pursuant to the  Offer. Each Dealer  Manager
will  also be reimbursed  by Cinergy for  its reasonable out-of-pocket expenses,
including attorneys' fees, and will be indemnified against certain  liabilities,
including  certain liabilities under the  federal securities laws, in connection
with the Offer. Each Dealer Manager has rendered, is currently rendering and  is
expected  to continue to  render various investment  banking services to Cinergy
and CG&E.  Each Dealer  Manager  has received,  and  will continue  to  receive,
customary  compensation  from  the  companies  for  such  services.  Cinergy has
retained The Bank  of New  York as Depositary  and MacKenzie  Partners, Inc.  as
Information  Agent in connection with the  Offer. The Depositary and Information
Agent will receive reasonable and customary compensation for their services  and
will  also be reimbursed for certain  out-of-pocket expenses. Cinergy has agreed
to indemnify the Depositary and  Information Agent against certain  liabilities,
including  certain liabilities under  the federal securities  law, in connection
with the  Offer. Neither  the  Depositary nor  the  Information Agent  has  been
retained to make solicitations or recommendations in connection with the Offer.
 
    SOLICITED  TENDER  FEES.   Pursuant to  Instruction  10 of  the accompanying
Letter of Transmittal  and Proxy,  Cinergy will  pay to  designated brokers  and
dealers  a solicitation fee of $1.50 per Share (except that for transactions for
beneficial owners  equal  to or  exceeding  5,000  Shares, Cinergy  will  pay  a
solicitation  fee  of $1.25  per Share)  for any  Shares tendered,  accepted for
payment and paid for pursuant to the Offer. However, Soliciting Dealers will not
be entitled  to  a  solicitation  fee for  Shares  beneficially  owned  by  such
Soliciting Dealer.
 
    STOCK  TRANSFER TAXES.  Cinergy  will pay all stock  transfer taxes, if any,
payable on  account of  the acquisition  of Shares  by Cinergy  pursuant to  the
Offer,  except  in  certain  circumstances  where  special  payment  or delivery
procedures are utilized pursuant to Instruction 6 of the accompanying Letter  of
Transmittal and Proxy.
 
                 CERTAIN INFORMATION REGARDING CINERGY AND CG&E
 
    JOINT  VENTURE.  During the second quarter of 1996, Avon Energy Partners plc
("Avon Energy"), a joint  venture between Cinergy  and General Public  Utilities
Corporation,  began to acquire all of the capital shares of Midlands Electricity
plc ("Midlands"). As  of August  13, 1996, Avon  Energy owned  381.3 million  of
Midlands'  shares, representing approximately 97.1%  of the issued share capital
of Midlands. The remaining shares are  expected to be acquired during the  third
quarter  of 1996. The total consideration to be paid by Avon Energy is estimated
to be approximately $2.6 billion.
 
    Midlands is  one of  twelve  regional electricity  companies in  the  United
Kingdom.  Midlands primarily distributes and supplies electricity to 2.2 million
industrial,  commercial,  and  residential  customers.  In  addition,  Midlands,
together  with  its  subsidiaries,  generates  power,  supplies  natural  gas to
industrial  and  commercial  customers,  and  performs  electrical   contracting
services.
 
                                       19
<PAGE>
    Following  the announcement of the  potential acquisition of Midlands, three
major credit rating agencies, Duff &  Phelps Credit Rating Co., Fitch  Investors
Service,  Inc., and Standard & Poor's  Corporation, affirmed the current ratings
of Cinergy's operating subsidiaries after their consideration of the effects  of
the  potential  acquisition.  The  other  major  credit  rating  agency, Moody's
Investors Service ("Moody's"), placed the credit ratings of Cinergy's  operating
subsidiaries, CG&E, PSI, and ULH&P, under review for possible downgrade. Moody's
indicated  that its review will focus on the likelihood of the transaction being
completed and will assess the operating strategies of the combined companies and
the anticipated benefits of the transaction. It will also focus on the financial
impact the  transaction will  have on  Cinergy and  its operating  subsidiaries,
including  the credit implications.  Cinergy cannot predict  the outcome of this
review.
 
    For further information relating to  the Midlands acquisition, reference  is
made to Cinergy's Current Reports on Form 8-K dated May 7, 1996 and June 6, 1996
(as  amended) and Cinergy's Quarterly Report on  Form 10-Q for the quarter ended
June 30, 1996 (as amended), which are hereby incorporated by reference.
 
    COMPETITION AND CORPORATE  STRUCTURE.   The primary  factor influencing  the
future profitability of Cinergy and CG&E is the changing competitive environment
for  energy services,  including the  impact of  emerging technologies,  and the
related commoditization  of  electric power  markets.  Changes in  the  industry
include  increased competition in  wholesale power markets  and ongoing pressure
for "customer  choice" by  large industrial  customers and,  ultimately, by  all
retail customers. Cinergy and CG&E support increased competition in the electric
utility  industry and have chosen to take a leadership role in state and Federal
debates on industry reform.
 
    As the electric  utility industry  moves toward  a competitive  environment,
Cinergy  is reassessing its corporate structure,  including the issue of whether
to remain  vertically  integrated.  As  a first  step  toward  "unbundling"  the
business  for  a competitive  environment,  Cinergy announced  its  intention to
reorganize into strategic  business units. This  functional reorganization  will
separate  Cinergy's utility businesses into an energy services business unit, an
energy delivery  business unit  and  an energy  commodities business  unit.  The
design  of these new organizations is expected to be completed by the end of the
year. Cinergy  continues to  analyze what  benefits, if  any, may  exist in  the
future  for  its  various stakeholders  of  separating the  business  units into
different corporations.
 
                                       20
<PAGE>
                 SUMMARY OF CONSOLIDATED FINANCIAL INFORMATION
 
    Set forth below is certain consolidated historical financial information  of
CG&E  and its subsidiaries. The historical financial information (other than the
ratios of earnings to fixed charges)  was derived from the audited  consolidated
financial  statements included in CG&E's Annual Report on Form 10-K for the year
ended December 31, 1995 and from the unaudited consolidated financial statements
included in CG&E's Quarterly Reports on Form 10-Q for the period ended June  30,
1996   and  the  period  ended  June  30,  1995,  which  statements  are  hereby
incorporated by reference. More comprehensive financial information is  included
in  such reports and the financial information which follows is qualified in its
entirety by reference to  such reports and all  of the financial statements  and
related  notes contained therein, copies  of which may be  obtained as set forth
herein. The data as of and for the  six months ended June 30, 1996 and June  30,
1995  has been derived from unaudited financial statements which, in the opinion
of  CG&E,  reflect   all  adjustments,  consisting   of  any  normal   recurring
adjustments,  necessary for a  fair representation of such  data. The results of
operations for such six  month periods do  not purport to  be indicative of  the
results to be expected for a full year.
 
CONDENSED INCOME STATEMENT DATA:
 
<TABLE>
<CAPTION>
                                                                          SIX MONTHS ENDED
                                               YEAR ENDED DECEMBER 31,        JUNE 30,
                                               -----------------------  --------------------
                                                 1995         1994        1996       1995
                                               ---------  ------------  ---------  ---------
                                                                            (UNAUDITED)
                                                        (THOUSANDS, EXCEPT RATIOS)
<S>                                            <C>        <C>           <C>        <C>
Operating Revenues...........................  $1,848,075 $1,788,185    $1,012,113 $ 918,665
Operating Income.............................    360,032     291,336(a)   189,507    180,237
Allowance for Borrowed and Equity Funds Used
 During Construction.........................      5,644       4,948        2,633      2,757
Phase-In Deferred Return.....................      8,537      15,351        4,186      4,268
Net Income...................................    236,201     158,311(a)   131,184    117,646
Preferred Dividend Requirement...............     17,673      22,377        6,948     10,724
Net Income Applicable to Common Stock........    218,528     135,934(a)   124,236    106,922
Ratio of Earnings to Fixed Charges...........       3.40        2.60(a)      4.00       3.39
</TABLE>
 
- ------------------------
(a) In  1994, CG&E recognized  charges to earnings  of approximately $64 million
    ($46 million, net of taxes)  primarily for certain merger-related and  other
    expenditures  which  cannot be  recovered  from customers  under  the merger
    savings sharing mechanism authorized  by the PUCO.  The charges include  the
    PUCO  electric  jurisdictional  portion  of  merger  costs  incurred through
    December 31, 1994,  previously capitalized  information systems  development
    costs,  and severance benefits to former officers  of CG&E. Of the total $64
    million charge, $52 million is reflected in "Operating Income."
 
                                       21
<PAGE>
CONDENSED BALANCE SHEET DATA (AT END OF PERIOD):
 
<TABLE>
<CAPTION>
                                               DECEMBER 31,              JUNE 30,
                                          ----------------------  ----------------------
                                             1995        1994        1996        1995
                                          ----------  ----------  ----------  ----------
                                                                       (UNAUDITED)
                                                           (THOUSANDS)
<S>                                       <C>         <C>         <C>         <C>
ASSETS:
Net Utility Plant In Service............  $3,698,240  $3,720,655  $3,679,128  $3,714,888
Construction Work In Progress...........      77,661      74,989      77,271      74,400
Cash and Temporary Cash Investments.....       6,612      52,516      31,855       3,500
Other Current Assets....................     600,184     544,180     399,892     514,701
Other Assets............................     814,699     789,325     796,534     786,448
                                          ----------  ----------  ----------  ----------
                                          $5,197,396  $5,181,665  $4,984,680  $5,093,937
                                          ----------  ----------  ----------  ----------
                                          ----------  ----------  ----------  ----------
LIABILITIES:
Common Equity...........................  $1,528,463  $1,532,972  $1,565,586  $1,528,894
Cumulative Preferred Stock..............     200,000     290,000     200,000     200,000
Long-term Debt..........................   1,702,650   1,837,757   1,694,627   1,774,404
Current Liabilities.....................     632,600     427,528     401,218     490,220
Other Liabilities.......................   1,133,683   1,093,408   1,123,249   1,100,419
                                          ----------  ----------  ----------  ----------
                                          $5,197,396  $5,181,665  $4,984,680  $5,093,937
                                          ----------  ----------  ----------  ----------
                                          ----------  ----------  ----------  ----------
</TABLE>
 
                    ADDITIONAL INFORMATION REGARDING CINERGY
 
    Cinergy is subject to the informational requirements of the Exchange Act and
in accordance  therewith  files periodic  reports,  proxy statements  and  other
information  with  the  SEC.  Cinergy  is required  to  disclose  in  such proxy
statements certain information, as of particular dates, concerning its directors
and officers, their remuneration, stock  options granted to them, the  principal
holders  of  its  securities  and  any  material  interest  of  such  persons in
transactions with Cinergy. In connection with the Offer, Cinergy has also  filed
an  Issuer Tender Offer Statement  on Schedule 13E-4 with  the SEC that includes
certain additional information relating to the Offer.
 
    Such material can be inspected and copied at the public reference facilities
of the SEC, Room 1024,  450 Fifth Street, N.W.,  Washington, D.C. 20549, and  at
its regional offices at Seven World Trade Center, 13th Floor, New York, New York
10048,  and Northwestern  Atrium Center,  500 West  Madison Street,  Suite 1400,
Chicago, Illinois  60661-2511. Reports,  proxy materials  and other  information
about  Cinergy are also available  at the offices of  the NYSE, 20 Broad Street,
New York, New York  10005. Copies may  also be obtained by  mail from the  SEC's
Public  Reference  Branch,  450  Fifth  Street,  N.W.,  Washington,  D.C. 20549.
Cinergy's Schedule 13E-4 will not be available at the SEC's regional offices.
 
                                 MISCELLANEOUS
 
    The Offer is not being made to, nor will Cinergy accept tenders from, owners
of Shares in any jurisdiction in which the Offer or its acceptance would not  be
in  compliance with the laws  of such jurisdiction. Cinergy  is not aware of any
jurisdiction where the making of the Offer or the tender of Shares would not  be
in  compliance with applicable law. If Cinergy becomes aware of any jurisdiction
where the making of the Offer or the tender of Shares is not in compliance  with
any  applicable law, Cinergy will  make a good faith  effort to comply with such
law. If, after such good faith effort, Cinergy cannot comply with such law,  the
Offer  will not be made to  (nor will tenders be accepted  from or on behalf of)
the owners of Shares residing in such jurisdiction. In any jurisdiction in which
the securities,  blue sky  or other  laws  require the  Offer to  be made  by  a
licensed  broker or  dealer, the Offer  will be  deemed to be  made on Cinergy's
behalf by one or more registered brokers  or dealers licensed under the laws  of
such jurisdiction.
 
                                          CINERGY CORP.
                                          THE CINCINNATI GAS & ELECTRIC COMPANY
 
                                       22
<PAGE>
    Facsimile  copies of the  Letter of Transmittal and  Proxy will be accepted.
The Letter of Transmittal and Proxy and, if applicable, certificates for  Shares
should be sent or delivered by each tendering or voting Preferred Shareholder of
CG&E  or his or her  broker, dealer, bank or trust  company to the Depositary at
one of its addresses set forth below.
 
                               The Depositary is:
                              THE BANK OF NEW YORK
 
<TABLE>
<S>                              <C>                         <C>
           BY MAIL:               FACSIMILE TRANSMISSION:     BY HAND OR OVERNIGHT COURIER:
                                 (FOR ELIGIBLE INSTITUTIONS
                                           ONLY)
 
 Tender & Exchange Department          (212) 815-6213         Tender & Exchange Department
        P.O. Box 11248                                             101 Barclay Street
     Church Street Station                                     Receive and Deliver Window
 New York, New York 10286-1248                                  New York, New York 10286
 
                                      FOR INFORMATION,
                                         TELEPHONE:
 
                                       (800) 507-9357
</TABLE>
 
    Any questions or requests for assistance may be directed to the  Information
Agent or the Dealer Managers at their respective telephone numbers and addresses
listed below. Requests for additional copies of this Offer to Purchase and Proxy
Statement,  the Letter of Transmittal  and Proxy or other  tender offer or proxy
materials may be directed to the  Information Agent or the Dealer Managers,  and
such  copies will  be furnished  promptly at  the companies'  expense. Preferred
Shareholders may also  contact their  local broker, dealer,  commercial bank  or
trust company for assistance concerning the Offer.
 
                             The Information Agent:
                                     [LOGO]
                                156 Fifth Avenue
                            New York, New York 10010
                         (212) 929-5500 (Call Collect)
                                       or
                        Call Toll-Free -- (800) 322-2885
 
                              The Dealer Managers:
 
<TABLE>
<S>                                            <C>
              SMITH BARNEY INC.                            MORGAN STANLEY & CO.
            388 Greenwich Street                               INCORPORATED
          New York, New York 10013                             1585 Broadway
               (800) 655-4811                            New York, New York 10036
          Attention: Paul S. Galant                      (800) 223-2440, Ext. 1965
                                                          Attention: Steve Sahara
</TABLE>
 
                                       23

<PAGE>


<PAGE>
                        LETTER OF TRANSMITTAL AND PROXY
                                  TO ACCOMPANY
               SHARES OF 4% SERIES CUMULATIVE PREFERRED STOCK OF
 
                     THE CINCINNATI GAS & ELECTRIC COMPANY
 
              TENDERED PURSUANT TO THE OFFER TO PURCHASE FOR CASH
                                       BY
                                 CINERGY CORP.,
                    DATED AUGUST 20, 1996, FOR PURCHASE AT A
                       PURCHASE PRICE OF $64.00 PER SHARE
 
                                     AND/OR
 
                     VOTED PURSUANT TO THE PROXY STATEMENT
                                       OF
                     THE CINCINNATI GAS & ELECTRIC COMPANY
 
    THE  OFFER AND  WITHDRAWAL RIGHTS  WILL EXPIRE AT  5:00 P.M.,  NEW YORK CITY
TIME, ON WEDNESDAY, SEPTEMBER 18, 1996, UNLESS THE OFFER IS EXTENDED.
 
    THE PROXY CONTAINED IN THIS DOCUMENT IS IN RESPECT OF THE SPECIAL MEETING OF
SHAREHOLDERS TO BE  HELD ON SEPTEMBER  18, 1996, OR  ON SUCH DATE  TO WHICH  THE
MEETING IS ADJOURNED OR POSTPONED.
 
                      TO: THE BANK OF NEW YORK, DEPOSITARY
 
<TABLE>
<S>                                                      <C>
                       BY MAIL:                                       BY HAND OR OVERNIGHT COURIER:
             Tender & Exchange Department                             Tender & Exchange Department
                    P.O. Box 11248                                         101 Barclay Street
                 Church Street Station                                 Receive and Deliver Window
             New York, New York 10286-1248                              New York, New York 10286
</TABLE>
 
                           BY FACSIMILE TRANSMISSION:
 
                                 (212) 815-6213
 
                     INFORMATION AND CONFIRM BY TELEPHONE:
 
                                 (800) 507-9357
 
    CINERGY  WILL NOT BE  REQUIRED TO ACCEPT  FOR PAYMENT OR  PAY FOR ANY SHARES
TENDERED IF THE PROPOSED  AMENDMENT IS NOT APPROVED  AND ADOPTED AT THE  SPECIAL
MEETING.  PREFERRED  SHAREHOLDERS  HAVE  THE  RIGHT  TO  VOTE  FOR  THE PROPOSED
AMENDMENT REGARDLESS OF WHETHER THEY TENDER  THEIR SHARES BY CASTING THEIR  VOTE
AND  SIGNING THE PROXY CONTAINED WITHIN THIS  LETTER OF TRANSMITTAL AND PROXY OR
BY VOTING  IN  PERSON AT  THE  SPECIAL MEETING.  IF  THE PROPOSED  AMENDMENT  IS
APPROVED  AND ADOPTED, CG&E WILL  MAKE A SPECIAL CASH  PAYMENT TO EACH PREFERRED
SHAREHOLDER WHO VOTED IN  FAVOR OF THE PROPOSED  AMENDMENT, PROVIDED THAT  THEIR
SHARES ARE NOT TENDERED PURSUANT TO THE OFFER.
 
    NOTE:  SIGNATURES  MUST  BE  PROVIDED BELOW.  PLEASE  READ  THE ACCOMPANYING
INSTRUCTIONS CAREFULLY.
 
    The undersigned hereby appoints  Jackson H. Randolph,  James E. Rogers,  and
William  J. Grealis, or any of them, as  proxies, each with the power to appoint
his substitute,  and  hereby  authorizes  them  to  represent  and  to  vote  as
designated  hereunder and in their discretion with respect to any other business
properly brought  before  the Special  Meeting,  all the  shares  of  cumulative
preferred  stock of  The Cincinnati  Gas &  Electric Company  ("CG&E") which the
undersigned is entitled  to vote at  the Special Meeting  of Shareholders to  be
held on September 18, 1996, or any adjournment(s) or postponement(s) thereof.
 
    NOTE:  IF YOU  ARE VOTING BUT  NOT TENDERING  SHARES, DO NOT  SEND ANY SHARE
CERTIFICATES WITH THIS LETTER OF TRANSMITTAL AND PROXY.
 
    THIS LETTER OF TRANSMITTAL AND PROXY IS SOLICITED ON BEHALF OF THE BOARD  OF
DIRECTORS  OF CG&E. The proxy contained  herein, when properly executed, will be
voted in the  manner directed herein  by the undersigned  shareholder(s). If  no
direction is made, the proxy will be voted FOR Item 1.
 
    Indicate  your vote by an (X). The  Board of Directors recommends voting FOR
Item 1.
<PAGE>
ITEM 1.
 
    To remove from the Amended Articles of Incorporation Article Fourth,  Clause
6-A(b)  in  its  entirety,  which  limits  CG&E's  ability  to  issue  unsecured
indebtedness.
 
             / / FOR             / / AGAINST             / / ABSTAIN
 
                NAME(S) AND ADDRESS(ES) OF REGISTERED HOLDER(S)
 
    SHARES REPRESENTED  BY  ALL  PROPERLY  EXECUTED PROXIES  WILL  BE  VOTED  IN
ACCORDANCE WITH INSTRUCTIONS APPEARING ON THIS PROXY. IN THE ABSENCE OF SPECIFIC
INSTRUCTIONS,  PROXIES WILL BE  VOTED IN ACCORDANCE  WITH THE RECOMMENDATIONS OF
THE BOARD OF DIRECTORS,  AND IN THE  DISCRETION OF THE PROXY  HOLDERS AS TO  ANY
OTHER MATTERS THAT MAY PROPERLY COME BEFORE THE SPECIAL MEETING.
 
Please check box if you plan to attend the Special Meeting. / /
 
                            SIGNATURE(S) OF OWNER(S)
 
X
- --------------------------------------------------------------------------------
X
- --------------------------------------------------------------------------------
Dated: ___________________________________________________________________, 1996
Name(s): _______________________________________________________________________
 
- --------------------------------------------------------------------------------
                                 (PLEASE PRINT)
Capacity (full title): _________________________________________________________
Address: _______________________________________________________________________
 
- --------------------------------------------------------------------------------
                               (INCLUDE ZIP CODE)
DAYTIME Area Code and Telephone No.: ___________________________________________
 
(Must  be signed by the registered holder(s) exactly as name(s) appear(s) on the
stock  certificate(s)  or  on  a  security  position  listing  or  by  person(s)
authorized   to  become  registered  holder(s)  by  certificates  and  documents
transmitted herewith. If  signature is  by a  trustee, executor,  administrator,
guardian, attorney-in-fact, officer of a corporation or other person acting in a
fiduciary  or  representative  capacity, please  set  forth full  title  and see
Instruction 5.)
<TABLE>
<S>                                               <C>
                                  DESCRIPTION OF SHARES TENDERED
  (IF TENDERING SHARES, PLEASE FILL IN EXACTLY AS INFORMATION APPEARS ON CERTIFICATE(S)) (ATTACH
                               ADDITIONAL SIGNED LIST IF NECESSARY)
                                                               TOTAL NUMBER OF SHARES
             CERTIFICATE NUMBER(S)*                        REPRESENTED BY CERTIFICATE(S)*
 
<CAPTION>
                                  DESCRIPTION OF
  (IF TENDERING SHARES, PLEASE FILL IN EXACTLY A
                               ADDITIONAL SIGNED
             CERTIFICATE NUMBER(S)*                         NUMBER OF SHARES TENDERED**
</TABLE>
 
 *Need not be completed by shareholders tendering by book-entry transfer.
<PAGE>
**Unless otherwise indicated, it will be assumed that all Shares represented by
  any certificates delivered to the Depositary are being tendered. See
  Instruction 4.
 
              GUARANTEE OF SIGNATURE(S) (SEE INSTRUCTIONS 1 AND 5)
Authorized Signature: __________________________________________________________
Name: __________________________________________________________________________
Name of Firm: __________________________________________________________________
Address of Firm: _______________________________________________________________
Area Code and Telephone No.: ___________________________________________________
Dated: ___________________________________________________________________, 1996
 
NOTE: IF SHARES ARE BEING TENDERED, THE REMAINDER OF THIS LETTER OF  TRANSMITTAL
      AND PROXY MUST BE COMPLETED, INCLUDING, IF APPLICABLE, THE SUBSTITUTE FORM
      W-9 BELOW.
 
    DELIVERY OF THIS LETTER OF TRANSMITTAL AND PROXY TO AN ADDRESS OTHER THAN AS
SET  FORTH ABOVE  OR TRANSMISSION OF  INSTRUCTIONS VIA A  FACSIMILE NUMBER OTHER
THAN ONE LISTED ABOVE WILL NOT CONSTITUTE  A VALID DELIVERY. YOU MUST SIGN  THIS
LETTER OF TRANSMITTAL AND PROXY IN THE APPROPRIATE SPACE THEREFOR PROVIDED ABOVE
AND, IF YOU ARE TENDERING ANY SHARES, COMPLETE THE SUBSTITUTE FORM W-9 SET FORTH
BELOW  OR  A FORM  W-8,  AS APPLICABLE.  SEE  INSTRUCTION 8  AND  "IMPORTANT TAX
INFORMATION" BELOW.
 
    DO NOT SEND  ANY CERTIFICATES  TO SMITH BARNEY  INC., MORGAN  STANLEY &  CO.
INCORPORATED,  MACKENZIE PARTNERS, INC.,  CINERGY CORP. OR  THE CINCINNATI GAS &
ELECTRIC COMPANY.
 
    THE INSTRUCTIONS ACCOMPANYING THIS LETTER OF TRANSMITTAL AND PROXY SHOULD BE
READ CAREFULLY BEFORE THIS LETTER OF TRANSMITTAL AND PROXY IS COMPLETED.
 
    This Letter of Transmittal and Proxy is to  be used (a) if Shares are to  be
voted  but not tendered, or (b) if  certificates are to be forwarded herewith or
(c) if  delivery  of  tendered Shares  (as  defined  below) is  to  be  made  by
book-entry  transfer to the Depositary's account at The Depository Trust Company
("DTC")  or  Philadelphia   Depository  Trust   Company  ("PDTC")   (hereinafter
collectively  referred to as  the "Book-Entry Transfer  Facilities") pursuant to
the procedures set forth under the heading "Terms of the Offer -- Procedure  for
Tendering  Shares"  in the  Offer to  Purchase and  Proxy Statement  (as defined
below).
 
    Preferred Shareholders  who wish  to tender  Shares yet  who cannot  deliver
their  Shares and all other  documents required hereby to  the Depositary by the
Expiration Date (as defined in the  Offer to Purchase and Proxy Statement)  must
tender  their Shares  pursuant to  the guaranteed  delivery procedure  set forth
under the heading "Terms of the Offer -- Procedure for Tendering Shares" in  the
Offer  to Purchase and Proxy Statement. See Instruction 2. DELIVERY OF DOCUMENTS
TO CINERGY,  THE CINCINNATI  GAS &  ELECTRIC COMPANY  OR A  BOOK-ENTRY  TRANSFER
FACILITY DOES NOT CONSTITUTE A VALID DELIVERY.
 
              (BOXES BELOW FOR USE BY ELIGIBLE INSTITUTIONS ONLY)
 
<TABLE>
<S>        <C>
/ /        CHECK  HERE IF TENDERED SHARES ARE BEING DELIVERED BY BOOK-ENTRY TRANSFER TO THE DEPOSITARY'S ACCOUNT AT
           ONE OF THE BOOK-ENTRY TRANSFER FACILITIES AND COMPLETE THE FOLLOWING:
           Name of tendering institution
           Check applicable box:
           / / DTC / / PDTC
           Account No.
           Transaction Code No.
/ /        CHECK HERE IF TENDERED SHARES ARE BEING DELIVERED PURSUANT TO A NOTICE OF GUARANTEED DELIVERY AND  PROXY
           PREVIOUSLY SENT TO THE DEPOSITARY AND COMPLETE THE FOLLOWING:
</TABLE>
 
Name(s) of tendering shareholder(s) ____________________________________________
 
Date of execution of Notice of Guaranteed Delivery and Proxy ___________________
 
Name of institution that guaranteed delivery ___________________________________
 
If delivery is by book-entry transfer:
 
Name of tendering institution __________________________________________________
 
Account no. ________________________________________ at
/ / DTC  / / PDTC
 
Transaction Code No. ___________________________________________________________
 
                    NOTE: SIGNATURES MUST BE PROVIDED ABOVE.
              PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY.
 
Ladies and Gentlemen:
 
    The  abovesigned  hereby tenders  to Cinergy  Corp., a  Delaware corporation
("Cinergy"), the  shares in  the amount  set  forth in  the box  above  labelled
"Description of Shares Tendered" pursuant to Cinergy's offer to purchase any and
all of the outstanding shares of the series of cumulative preferred stock of The
Cincinnati  Gas  &  Electric Company,  an  Ohio corporation  and  direct utility
subsidiary of Cinergy ("CG&E"), shown on the first page hereof as to which  this
Letter  of Transmittal  and Proxy is  applicable (the "Shares")  at the purchase
price per Share shown on the first page hereof, net to the seller in cash,  upon
the  terms and subject to the conditions set  forth in the Offer to Purchase and
Proxy Statement,  dated  August 20,  1996  (the  "Offer to  Purchase  and  Proxy
Statement"),  receipt of  which is  hereby acknowledged,  and in  this Letter of
Transmittal and  Proxy (which  as to  the  Shares, together  with the  Offer  to
Purchase   and  Proxy  Statement,  constitutes  the  "Offer").  WHILE  PREFERRED
SHAREHOLDERS WHO WISH TO TENDER THEIR SHARES PURSUANT TO THE OFFER NEED NOT VOTE
IN   FAVOR   OF   THE   PROPOSED   AMENDMENT   TO   CG&E'S   AMENDED    ARTICLES
<PAGE>
OF INCORPORATION, AS SET FORTH IN THE OFFER TO PURCHASE AND PROXY STATEMENT (THE
"PROPOSED  AMENDMENT"),  THE OFFER  IS CONDITIONED  UPON THE  PROPOSED AMENDMENT
BEING APPROVED AND ADOPTED AT  THE SPECIAL MEETING (AS  DEFINED IN THE OFFER  TO
PURCHASE  AND PROXY STATEMENT). See "Proposed Amendment and Proxy Solicitation",
"Terms of the Offer -- Extension of Tender Period; Termination; Amendments"  and
"Terms of the Offer -- Certain Conditions of the Offer" in the Offer to Purchase
and Proxy Statement.
 
    Subject  to, and effective  upon, acceptance for payment  of and payment for
the Shares tendered  herewith in accordance  with the terms  and subject to  the
conditions  of the Offer  (including, if the  Offer is extended  or amended, the
terms and conditions of any such extension or amendment), the abovesigned hereby
sells, assigns and transfers to, or upon the order of, Cinergy all right,  title
and  interest in and to all the Shares that are being tendered hereby and hereby
constitutes and appoints The  Bank of New York  (the "Depositary") the true  and
lawful  agent  and  attorney-in-fact of  the  abovesigned with  respect  to such
Shares, with  full  power of  substitution  (such  power of  attorney  being  an
irrevocable  power coupled  with an interest),  to (a)  deliver certificates for
such Shares,  or  transfer  ownership  of  such  Shares  on  the  account  books
maintained  by any of the Book-Entry  Transfer Facilities, together, in any such
case, with all accompanying evidences of  transfer and authenticity, to or  upon
the  order of Cinergy, (b) present such  Shares for registration and transfer on
the books of CG&E and (c) receive all benefits and otherwise exercise all rights
of beneficial ownership of such Shares, all in accordance with the terms of  the
Offer.
 
    The abovesigned hereby represents and warrants that the abovesigned has full
power  and authority  to tender, sell,  assign and transfer  the Shares tendered
hereby and that, when  and to the  extent the same are  accepted for payment  by
Cinergy,  Cinergy will acquire good,  marketable and unencumbered title thereto,
free and clear  of all liens,  restrictions, charges, encumbrances,  conditional
sales  agreements or other obligations relating to the sale or transfer thereof,
and the same will not  be subject to any  adverse claims. The abovesigned  will,
upon  request,  execute  and  deliver any  additional  documents  deemed  by the
Depositary or  Cinergy  to be  necessary  or  desirable to  complete  the  sale,
assignment and transfer of the Shares tendered hereby.
 
    All  authority  herein conferred  or  agreed to  be  conferred shall  not be
affected by, and shall survive the  death or incapacity of the abovesigned,  and
any  obligations of the  abovesigned hereunder shall be  binding upon the heirs,
personal representatives, successors and assigns  of the abovesigned. Except  as
stated in the Offer, this tender is irrevocable.
 
    The  abovesigned understands that  tenders of Shares pursuant  to any one of
the procedures described under the heading "Terms of the Offer -- Procedure  for
Tendering  Shares"  in the  Offer to  Purchase  and Proxy  Statement and  in the
instructions hereto will  constitute the abovesigned's  acceptance of the  terms
and  conditions  of the  Offer, including  the abovesigned's  representation and
warranty that (a) the abovesigned  has a net long  position in the Shares  being
tendered  within  the meaning  of Rule  14e-4  promulgated under  the Securities
Exchange Act of 1934,  as amended, and  (b) the tender  of such Shares  complies
with Rule 14e-4. Cinergy's acceptance for payment of Shares tendered pursuant to
the  Offer  will  constitute a  binding  agreement between  the  abovesigned and
Cinergy upon the terms and subject to the conditions of the Offer.
 
    The abovesigned recognizes  that, under certain  circumstances set forth  in
the  Offer to Purchase and  Proxy Statement, Cinergy may  terminate or amend the
Offer or may not be required to  purchase any of the Shares tendered hereby.  In
either event, the abovesigned understands that certificate(s) for any Shares not
tendered or not purchased will be returned to the abovesigned.
 
    Unless  otherwise  indicated in  the box  below  under the  heading "Special
Payment Instructions", please  issue the  check for  the purchase  price of  any
Shares purchased, and/or return any Shares not tendered or not purchased, in the
name(s)  of the abovesigned (and,  in the case of  Shares tendered by book-entry
transfer,  by  credit  to  the  account  at  the  Book-Entry  Transfer  Facility
designated above). Unless otherwise indicated in the box below under the heading
"Special Delivery Instructions", please mail the check for the purchase price of
any  Shares purchased  and/or any  certificates for  Shares not  tendered or not
purchased (and accompanying documents, as appropriate) to the abovesigned at the
address shown  below  the  abovesigned  signature(s). In  the  event  that  both
"Special   Payment  Instructions"   and  "Special   Delivery  Instructions"  are
completed, please issue the check for the purchase price of any Shares purchased
and/or return any Shares not  tendered or not purchased  in the name(s) of,  and
mail  said check  and/or any  certificates to,  the person(s)  so indicated. The
abovesigned recognizes that Cinergy has no obligation, pursuant to the  "Special
Payment  Instructions", to transfer  any Shares from the  name of the registered
holder(s) thereof if Cinergy does  not accept for payment  any of the Shares  so
tendered.
 
<TABLE>
<S>                                                     <C>
             SPECIAL PAYMENT INSTRUCTIONS                           SPECIAL DELIVERY INSTRUCTIONS
            (SEE INSTRUCTIONS 4, 6 AND 7)                           (SEE INSTRUCTIONS 4, 6 AND 7)
 
    To be completed ONLY if the check for the purchase  To  be completed  ONLY if  the check  for the purchase
price of  Shares  purchased  and/or  certificates  for  price  of  Shares  purchased  and/or  certificates for
Shares not tendered or not purchased are to be  issued  Shares  not tendered or not purchased are to be mailed
in the name of someone other than the abovesigned.      to someone  other  than  the  abovesigned  or  to  the
                                                        abovesigned  at an address other than that shown below
                                                        the abovesigned's signature(s).
 
Issue  / / check and/or                                 Mail  / / check and/or
      / / certificate(s) to:                            / / certificate(s) to:
Name                                                    Name
                    (PLEASE PRINT)                                          (PLEASE PRINT)
 
Address                                                 Address
 
                     (INCLUDE ZIP CODE)                                   (INCLUDE ZIP CODE)
 
             (TAXPAYER IDENTIFICATION OR
               SOCIAL SECURITY NUMBER)
</TABLE>
 
<TABLE>
<S>        <C>
/ /        CHECK HERE IF ANY OF THE  CERTIFICATES REPRESENTING SHARES THAT YOU OWN  AND WISH TO TENDER HAVE BEEN  LOST,
           DESTROYED OR STOLEN. (SEE INSTRUCTION 12.)
           Number of Shares represented by lost, destroyed or stolen certificates:
</TABLE>
 
<PAGE>
                               SOLICITED TENDERS
                              (SEE INSTRUCTION 10)
 
    As provided in Instruction 10, Cinergy will pay to any Soliciting Dealer, as
defined  in Instruction 10, a  solicitation fee of $1.50  per Share (except that
for transactions  for beneficial  owners  equal to  or exceeding  5,000  Shares,
Cinergy will pay a solicitation fee of $1.25 per Share) for any Shares tendered,
accepted for payment and paid pursuant to the Offer. However, Soliciting Dealers
will not be entitled to a solicitation fee for Shares beneficially owned by such
Soliciting Dealer.
 
    The  undersigned represents that  the Soliciting Dealer  which solicited and
obtained this tender is:
 
Name of Firm: __________________________________________________________________
                                      (PLEASE PRINT)
 
Name of Individual Broker
or Financial Consultant: _______________________________________________________
 
Telephone Number of Broker
or Financial Consultant: _______________________________________________________
 
Identification Number (if known): ______________________________________________
 
Address: _______________________________________________________________________
                                   (INCLUDE ZIP CODE)
 
    The following to be completed ONLY if customer's Shares held in nominee name
are tendered.
 
<TABLE>
<S>                                                      <C>
NAME OF BENEFICIAL OWNER                                 NUMBER OF SHARES TENDERED
                                     (ATTACH ADDITIONAL LIST IF NECESSARY)
- -------------------------------------------------------  -------------------------------------------------------
- -------------------------------------------------------  -------------------------------------------------------
- -------------------------------------------------------  -------------------------------------------------------
</TABLE>
 
    The acceptance of compensation by  such Soliciting Dealer will constitute  a
representation  by it that (a) it  has complied with the applicable requirements
of the Securities Exchange Act of 1934, as amended, and the applicable rules and
regulations thereunder, in connection with such solicitation; (b) it is entitled
to such compensation for such solicitation under the terms and conditions of the
Offer to  Purchase;  (c)  in  soliciting  tenders of  Shares,  it  has  used  no
soliciting  materials other than those furnished by  Cinergy; and (d) if it is a
foreign broker or dealer not eligible for membership in the National Association
of Securities Dealers, Inc. (the "NASD"), it has agreed to conform to the NASD's
Rules of Fair Practice in making solicitations.
 
    The payment of compensation  to any Soliciting Dealer  is dependent on  such
Soliciting Dealer returning a Notice of Solicited Tenders to the Depositary.
 
                 (IF SHARES ARE BEING TENDERED, PLEASE COMPLETE
            SUBSTITUTE FORM W-9 BELOW OR A FORM W-8, AS APPLICABLE)
 
SIGN HERE: _____________________________________________________________________
<PAGE>
                                  INSTRUCTIONS
 
             FORMING PART OF THE TERMS AND CONDITIONS OF THE OFFER
 
    1.    GUARANTEE OF  SIGNATURES.   Except  as  otherwise provided  below, all
signatures on this Letter of Transmittal and Proxy must be guaranteed by a  firm
that  is a member of  a registered national securities  exchange or the National
Association of  Securities Dealers,  Inc.,  or by  a  commercial bank  or  trust
company  having  an office  or correspondent  in  the United  States which  is a
participant in an approved Signature  Guarantee Medallion Program (an  "Eligible
Institution").  Signatures on this  Letter of Transmittal and  Proxy need not be
guaranteed (a)  if  this  Letter of  Transmittal  and  Proxy is  signed  by  the
registered  holder(s) of the Shares (which  term, for purposes of this document,
shall include any participant in one of the Book-Entry Transfer Facilities whose
name appears on  a security position  listing as the  owner of Shares)  tendered
herewith  and such holder(s) has  not completed the box  above under the heading
"Special Payment  Instructions" or  the  box above  under the  heading  "Special
Delivery  Instructions" on  this Letter  of Transmittal  and Proxy,  (b) if such
Shares are tendered for the  account of an Eligible  Institution or (c) if  this
Letter  of Transmittal and Proxy is being  used solely for the purpose of voting
Shares which are not being tendered pursuant to the Offer. See Instruction 5.
 
    2.  DELIVERY OF LETTER OF TRANSMITTAL AND PROXY AND SHARES.  This Letter  of
Transmittal  and Proxy  is to be  used if  (a) certificates are  to be forwarded
herewith, (b) delivery of Shares is  to be made by book-entry transfer  pursuant
to  the procedures set forth under the  heading "Terms of the Offer -- Procedure
for Tendering Shares" in the Offer to Purchase and Proxy Statement or (c) Shares
are being voted in  connection with the Offer.  Certificates for all  physically
delivered   Shares,  or  a  confirmation  of  a  book-entry  transfer  into  the
Depositary's account at one of the Book-Entry Transfer Facilities of all  Shares
delivered  electronically, as  well as  a properly  completed and  duly executed
Letter of Transmittal and Proxy (or  facsimile thereof) and any other  documents
required  by  this Letter  of Transmittal  and  Proxy, must  be received  by the
Depositary at one of its addresses set forth on the front page of this Letter of
Transmittal and Proxy  on or prior  to the  Expiration Date (as  defined in  the
Offer  to Purchase  and Proxy Statement)  with respect to  all Shares. Preferred
Shareholders who wish to tender their Shares yet who cannot deliver their Shares
and all other required documents to the Depositary on or prior to the Expiration
Date must tender their Shares pursuant to the guaranteed delivery procedure  set
forth  under the heading "Terms of the  Offer -- Procedure for Tendering Shares"
in the Offer to  Purchase and Proxy Statement.  Pursuant to such procedure:  (a)
such  tender must be made by or  through an Eligible Institution, (b) a properly
completed and duly executed Notice of Guaranteed Delivery and Proxy in the  form
provided by Cinergy (with any required signature guarantees) must be received by
the  Depositary  on or  prior  to the  applicable  Expiration Date  and  (c) the
certificates for  all  physically  delivered  Shares, or  a  confirmation  of  a
book-entry  transfer  into the  Depositary's account  at  one of  the Book-Entry
Transfer Facilities  of  all  Shares  delivered electronically,  as  well  as  a
properly  completed  and  duly  executed Letter  of  Transmittal  and  Proxy (or
facsimile  thereof)  and  any  other  documents  required  by  this  Letter   of
Transmittal  and Proxy must be received by the Depositary by 5:00 p.m. (New York
City time) within three New York Stock  Exchange trading days after the date  of
execution of such Notice of Guaranteed Delivery and Proxy, all as provided under
the  heading "Terms of the Offer -- Procedure for Tendering Shares" in the Offer
to Purchase and Proxy Statement.
 
    THE METHOD OF DELIVERY OF SHARES AND ALL OTHER REQUIRED DOCUMENTS IS AT  THE
OPTION  AND RISK  OF THE  TENDERING PREFERRED  SHAREHOLDER. IF  CERTIFICATES FOR
SHARES ARE SENT BY MAIL, REGISTERED MAIL WITH RETURN RECEIPT REQUESTED, PROPERLY
INSURED, IS RECOMMENDED.
 
    No alternative,  conditional or  contingent tenders  will be  accepted.  See
"Terms  of  the Offer  --  Number of  Shares;  Purchase Price;  Expiration Date;
Dividends" in  the Offer  to Purchase  and Proxy  Statement. By  executing  this
Letter   of  Transmittal  and  Proxy   (or  facsimile  thereof),  the  tendering
stockholder waives any right to receive any notice of the acceptance for payment
of the Shares.
 
    3.  VOTING.   WHILE PREFERRED SHAREHOLDERS WHO  WISH TO TENDER THEIR  SHARES
PURSUANT TO THE OFFER NEED NOT VOTE IN FAVOR OF THE PROPOSED AMENDMENT TO CG&E'S
AMENDED  ARTICLES OF INCORPORATION,  AS SET FORTH  IN THE OFFER  TO PURCHASE AND
PROXY STATEMENT (THE "PROPOSED  AMENDMENT"), THE OFFER  IS CONDITIONED UPON  THE
PROPOSED AMENDMENT BEING APPROVED AND ADOPTED AT THE SPECIAL MEETING (AS DEFINED
IN   THE  OFFER  TO  PURCHASE  AND  PROXY  STATEMENT).  In  addition,  Preferred
Shareholders have the  right to vote  for the proposed  amendment regardless  of
whether  they tender their Shares by casting  their vote and duly executing this
Letter of Transmittal and Proxy or by  voting in person at the Special  Meeting.
By  executing a Notice of Guaranteed Delivery and Proxy, a Preferred Shareholder
is taken to  have tendered  the Shares described  in such  Notice of  Guaranteed
Delivery  and Proxy and to  have voted such Shares  in accordance with the proxy
contained therein. If  no vote is  indicated on an  otherwise properly  executed
proxy  contained within this Letter of Transmittal and Proxy (or within a Notice
of Guaranteed Delivery and Proxy), then all Shares in respect of such proxy will
be voted in favor of the  Proposed Amendment. See "PROPOSED AMENDMENT AND  PROXY
SOLICITATION"  in the Offer to Purchase and  Proxy Statement. The Offer is being
sent to all persons in whose names Shares are registered on the books of CG&E on
the Record Date (as defined in the Offer to Purchase and Proxy Statement) and on
August 15, 1996. Only a record holder of  Shares on the Record Date may vote  in
person  or by proxy at the Special Meeting  (as defined in the Offer to Purchase
and Proxy Statement). No record date is fixed for determining which persons  are
permitted  to tender Shares. Any person who  is the beneficial owner but not the
record holder of  Shares must  arrange for the  record transfer  of such  Shares
prior to tendering.
 
    4.  PARTIAL TENDERS (NOT APPLICABLE TO SHAREHOLDERS WHO TENDER BY BOOK-ENTRY
TRANSFER).    If  fewer  than  all the  Shares  represented  by  any certificate
delivered to the Depositary  are to be  tendered, fill in  the number of  Shares
that  are to  be tendered  in the  box above  under the  heading "Description of
Shares Tendered".  In such  case, a  new certificate  for the  remainder of  the
Shares  represented by the old certificate will be sent to the person(s) signing
this Letter of Transmittal and Proxy, unless otherwise provided in the box above
under the
<PAGE>
heading "Special Payment  Instructions" or "Special  Delivery Instructions",  as
promptly  as practicable following  the expiration or  termination of the Offer.
All Shares  represented by  certificates  delivered to  the Depositary  will  be
deemed to have been tendered unless otherwise indicated.
 
    5.    SIGNATURES  ON  LETTER  OF  TRANSMITTAL  AND  PROXY  AND/OR  NOTICE OF
GUARANTEED DELIVERY AND PROXY;  STOCK POWERS AND ENDORSEMENTS.   If either  this
Letter  of Transmittal and Proxy or the  Notice of Guaranteed Delivery and Proxy
(together, the  "Tender  and  Proxy  Documents") is  signed  by  the  registered
holder(s)  of the Shares tendered hereby,  the signature(s) must correspond with
the name(s)  as written  on the  face of  the certificates  without  alteration,
enlargement or any change whatsoever.
 
    If  any  of the  Shares  tendered or  voted  under either  Tender  and Proxy
Document is held of record  by two or more persons,  all such persons must  sign
such Tender and Proxy Document.
 
    If  any  of the  Shares  tendered or  voted  under either  Tender  and Proxy
Document is registered in different names or different certificates, it will  be
necessary  to complete, sign  and submit as many  separate applicable Tender and
Proxy Documents as there are different registrations of certificates.
 
    If either Tender and Proxy Document is signed by the registered holder(s) of
the Shares tendered hereby,  no endorsements of  certificates or separate  stock
powers  are required unless payment  of the purchase price is  to be made to, or
Shares not tendered or not  purchased are to be registered  in the name of,  any
person  other than the registered holder(s). Signatures on any such certificates
or stock powers must be guaranteed  by an Eligible Institution. See  Instruction
1.
 
    If this Letter of Transmittal and Proxy is signed by a person other than the
registered  holder(s)  of  the  Shares  tendered  hereby,  certificates  must be
endorsed or  accompanied by  appropriate stock  powers, in  either case,  signed
exactly as the name(s) of the registered holder(s) appear(s) on the certificates
for  such Shares. Signature(s) on any such  certificates or stock powers must be
guaranteed by an Eligible Institution. See Instruction 1.
 
    If either Tender  and Proxy Document  or any certificate  or stock power  is
signed  by  a  trustee,  executor,  administrator,  guardian,  attorney-in-fact,
officer of a corporation or other person acting in a fiduciary or representative
capacity, such  person should  so  indicate when  signing, and  proper  evidence
satisfactory  to  Cinergy of  the authority  of such  person so  to act  must be
submitted.
 
    6.   STOCK TRANSFER  TAXES.   Except as  set forth  in this  Instruction  6,
Cinergy  will pay or cause  to be paid any stock  transfer taxes with respect to
the sale and transfer of  any Shares to it or  its order pursuant to the  Offer.
If,  however, payment  of the  purchase price is  to be  made to,  or Shares not
tendered or not purchased are to be registered in the name of, any person  other
than  the registered holder(s), or if tendered Shares are registered in the name
of any person other  than the person(s) signing  this Letter of Transmittal  and
Proxy, the amount of any stock transfer taxes (whether imposed on the registered
holder(s), such other person or otherwise) payable on account of the transfer to
such  person  will  be  deducted from  the  purchase  price  unless satisfactory
evidence of the payment of such taxes, or exemption therefrom, is submitted. See
"Terms of the Offer -- Acceptance of Shares for Payment and Payment of  Purchase
Price  and Dividend"  in the  Offer to Purchase  and Proxy  Statement. EXCEPT AS
PROVIDED IN THIS INSTRUCTION 6, IT WILL  NOT BE NECESSARY TO AFFIX TRANSFER  TAX
STAMPS TO THE CERTIFICATES REPRESENTING SHARES TENDERED HEREBY.
 
    7.    SPECIAL PAYMENT  AND  DELIVERY INSTRUCTIONS.    If the  check  for the
purchase price of any Shares  purchased is to be issued  in the name of,  and/or
any  Shares not tendered or not purchased are  to be returned to, a person other
than the person(s) signing this Letter of Transmittal and Proxy or if the  check
and/or any certificate for Shares not tendered or not purchased are to be mailed
to someone other than the person(s) signing this Letter of Transmittal and Proxy
or  to an  address other  than that  shown in  the box  above under  the heading
"Name(s) and Address(es)  of Registered  Holder(s)", then  the "Special  Payment
Instructions"   and/or  "Special  Delivery  Instructions"   on  this  Letter  of
Transmittal and  Proxy should  be  completed. Preferred  Shareholders  tendering
Shares  by book-entry  transfer will  have any  Shares not  accepted for payment
returned by crediting the  account maintained by  such Preferred Shareholder  at
the Book-Entry Transfer Facility from which such transfer was made.
 
    8.   SUBSTITUTE FORM W-9 AND FORM  W-8.  The tendering Preferred Shareholder
is  required  to  provide  the   Depositary  with  either  a  correct   Taxpayer
Identification  Number ("TIN") on  Substitute Form W-9,  which is provided under
"Important Tax Information" below, or a properly completed Form W-8. Failure  to
provide  the information on either  Substitute Form W-9 or  Form W-8 may subject
the tendering Preferred Shareholder to 31% federal income tax backup withholding
on the payment  of the  purchase price  for the  Shares. The  box in  Part 2  of
Substitute  Form W-9 may  be checked if the  tendering Preferred Shareholder has
not been issued a  TIN and has applied  for a number or  intends to apply for  a
number in the near future. If the box in Part 2 is checked and the Depositary is
not provided with a TIN by the time of payment, the Depositary will withhold 31%
on  all payments of the purchase price for  the Shares thereafter until a TIN is
provided to the Depositary.
 
    9.  REQUESTS FOR ASSISTANCE OR ADDITIONAL COPIES.  Any questions or requests
for assistance may be directed to  the Information Agent or the Dealer  Managers
at  their respective telephone numbers and  addresses listed below. Requests for
additional copies of the Offer to  Purchase and Proxy Statement, this Letter  of
Transmittal  and Proxy or  other tender offer  materials may be  directed to the
Information Agent  or the  Dealer Managers  and such  copies will  be  furnished
promptly  at Cinergy's  expense. Preferred  Shareholders may  also contact their
local broker, dealer, commercial bank or trust company for assistance concerning
the Offer.
 
    10.  SOLICITED TENDERS.   Cinergy will pay a  solicitation fee of $1.50  per
Share  (except that for transactions for beneficial owners equal to or exceeding
5,000 Shares, Cinergy will pay  a solicitation fee of  $1.25 per Share) for  any
Shares tendered, accepted for payment and paid pursuant to the Offer, covered by
the  Letter  of  Transmittal  and  Proxy  which  designates,  under  the heading
"Solicited Tenders", as having  solicited and obtained the  tender, the name  of
<PAGE>
(a)  any  broker or  dealer in  securities,  including a  Dealer Manager  in its
capacity as a dealer  or broker, which  is a member  of any national  securities
exchange  or  of  the  National Association  of  Securities  Dealers,  Inc. (the
"NASD"), (b) any  foreign broker or  dealer not eligible  for membership in  the
NASD  which agrees to conform to the NASD's Rules of Fair Practice in soliciting
tenders outside the United States to the  same extent as though it were an  NASD
member, or (c) any bank or trust company (each of which is referred to herein as
a "Soliciting Dealer"). No such fee shall be payable to a Soliciting Dealer with
respect to the tender of Shares by a holder unless the Letter of Transmittal and
Proxy  accompanying such tender  designates such Soliciting  Dealer. No such fee
shall be payable to a Soliciting Dealer  in respect of Shares registered in  the
name  of such Soliciting Dealer  unless such Shares are  held by such Soliciting
Dealer as nominee and such Shares are  being tendered for the benefit of one  or
more  beneficial owners identified on the Letter  of Transmittal and Proxy or on
the Notice of Solicited Tenders (included  in the materials provided to  brokers
and  dealers). No such fee shall be  payable to a Soliciting Dealer with respect
to the  tender of  Shares  by the  holder  of record,  for  the benefit  of  the
beneficial  owner, unless  the beneficial  owner has  designated such Soliciting
Dealer. If  tendered Shares  are  being delivered  by book-entry  transfer,  the
Soliciting  Dealer must return  a Notice of Solicited  Tenders to the Depositary
within  three  business  days  after  expiration  of  the  Offer  to  receive  a
solicitation  fee. No such fee  shall be payable to  a Soliciting Dealer if such
Soliciting Dealer is required for any reason to transfer the amount of such  fee
to  a depositing  holder (other  than itself). No  such fee  shall be  paid to a
Soliciting Dealer with respect to  Shares tendered for such Soliciting  Dealer's
own account. No broker, dealer, bank, trust company or fiduciary shall be deemed
to  be the agent of Cinergy, the Depositary, the Information Agent or the Dealer
Managers for purposes of the Offer.
 
    11.  IRREGULARITIES.   All questions  as to  the form of  documents and  the
validity,  eligibility (including time of receipt)  and acceptance of any tender
of Shares  will  be determined  by  Cinergy, in  its  sole discretion,  and  its
determination shall be final and binding. Cinergy reserves the absolute right to
reject  any and all tenders of Shares that  it determines are not in proper form
or the acceptance for payment of or payment for Shares that may, in the  opinion
of  Cinergy's counsel, be unlawful. Cinergy  also reserves the absolute right to
waive any of the conditions  to the Offer or any  defect or irregularity in  any
tender of Shares and Cinergy's interpretation of the terms and conditions of the
Offer  (including these instructions) shall be final and binding. Unless waived,
any defects or irregularities  in connection with tenders  must be cured  within
such  time as Cinergy shall determine. None of Cinergy, the Dealer Managers, the
Depositary, the Information Agent or any other person shall be under any duty to
give notice of any defect or irregularity in tenders nor shall any of them incur
any liability for failure to give any such notice. Tenders will not be deemed to
have been made until all defects and irregularities have been cured or waived.
 
    12.    LOST,  DESTROYED  OR   STOLEN  CERTIFICATES.    If  any   certificate
representing   Shares  has  been  lost,   destroyed  or  stolen,  the  Preferred
Shareholder  should  promptly  notify  the   Depositary  by  checking  the   box
immediately   following  the   Special  Payment   Instructions/Special  Delivery
Instructions and indicating the number of Shares lost, destroyed or stolen.  The
Preferred  Shareholder will then be instructed as to the procedures that must be
taken in order to replace the certificate. The tender of Shares pursuant to this
Letter of Transmittal and Proxy will not be valid unless prior to the Expiration
Date (as  defined  in the  Offer  to Purchase  and  Proxy Statement):  (a)  such
procedures  have been completed and a replacement certificate for the Shares has
been delivered to  the Depositary  or (b) a  Notice of  Guaranteed Delivery  and
Proxy has been delivered to the Depositary. See Instruction 2.
 
    IMPORTANT:  THIS  LETTER  OF  TRANSMITTAL AND  PROXY  (OR  A  FACSIMILE COPY
HEREOF),  DULY  EXECUTED,   TOGETHER  WITH,  IF   APPLICABLE,  CERTIFICATES   OR
CONFIRMATION  OF BOOK-ENTRY TRANSFER,  AND ALL OTHER  REQUIRED DOCUMENTS MUST BE
RECEIVED BY THE DEPOSITARY, OR, IF APPLICABLE, THE NOTICE OF GUARANTEED DELIVERY
AND PROXY MUST  BE RECEIVED BY  THE DEPOSITARY,  ON OR PRIOR  TO THE  APPLICABLE
EXPIRATION DATE (AS DEFINED IN THE OFFER TO PURCHASE AND PROXY STATEMENT).
 
                           IMPORTANT TAX INFORMATION
 
    Under  federal income tax law, a Preferred Shareholder whose tendered Shares
are accepted for payment is required  to provide the Depositary (as payer)  with
either  such Preferred Shareholder's correct TIN on Substitute Form W-9 below or
a properly completed Form W-8. If  such Preferred Shareholder is an  individual,
the TIN is his or her social security number. For businesses and other entities,
the  number is the federal employer  identification number. If the Depositary is
not provided with the correct TIN or properly completed Form W-8, the  Preferred
Shareholder  may be  subject to  a $50 penalty  imposed by  the Internal Revenue
Service. In addition, payments that are made to such Preferred Shareholder  with
respect  to Shares  purchased pursuant  to the  Offer may  be subject  to backup
withholding. The Form W-8 can be obtained from the Depositary. See the  enclosed
Guidelines  for Certification  of Taxpayer  Identification Number  on Substitute
Form W-9 for additional instructions.
 
    If federal income tax backup withholding applies, the Depositary is required
to withhold  31% of  any  payments made  to  the Preferred  Shareholder.  Backup
withholding  is not an additional tax.  Rather, the federal income tax liability
of persons subject to backup  withholding will be reduced  by the amount of  the
tax withheld. If withholding results in an overpayment of taxes, a refund may be
obtained.
 
PURPOSE OF SUBSTITUTE FORM W-9 AND FORM W-8
 
    To  avoid  backup  withholding on  payments  that  are made  to  a Preferred
Shareholder with  respect  to  Shares  purchased  pursuant  to  the  Offer,  the
Preferred Shareholder is required to notify the Depositary of his or her correct
TIN  by completing the  Substitute Form W-9 attached  hereto certifying that the
TIN provided  on Substitute  Form W-9  is  correct and  that (a)  the  Preferred
Shareholder has not been notified by the Internal Revenue Service that he or she
is  subject to federal income  tax backup withholding as  a result of failure to
report all  interest  or dividends  or  (b)  the Internal  Revenue  Service  has
notified  the  Preferred Shareholder  that he  or  she is  no longer  subject to
federal income tax
<PAGE>
backup withholding.  Foreign  Preferred  Shareholders  must  submit  a  properly
completed  Form  W-8  in  order  to  avoid  the  applicable  backup withholding;
provided, however, that backup withholding  will not apply to foreign  Preferred
Shareholders subject to 30% (or lower treaty rate) withholding on gross payments
received pursuant to the Offer.
 
WHAT NUMBER TO GIVE THE DEPOSITARY
 
    The  Preferred Shareholder  is required  to give  the Depositary  the social
security number or employer identification number of the registered owner of the
Shares. If the Shares are in  more than one name or are  not in the name of  the
actual  owner,  consult the  enclosed Guidelines  for Certification  of Taxpayer
Identification Number on Substitute  Form W-9 for  additional guidance on  which
number to report.
 
                       PAYER'S NAME: THE BANK OF NEW YORK
 
<TABLE>
<S>                               <C>                                  <C>
                                  Part 1 -- PLEASE PROVIDE YOUR TIN        Social Security Number OR
                                  IN THE BOX AT RIGHT AND CERTIFY BY    Employer Identification Number
                                  SIGNING AND DATING BELOW.                           TIN
                                  Name (Please Print)
                                  Address                              Part 2 --
SUBSTITUTE                        City State Zip Code                  Awaiting TIN  / /
                                  Part 3 -- CERTIFICATION -- UNDER THE PENALTIES OF PERJURY, I CERTIFY
                                  THAT: (1) the number shown on this form is my correct taxpayer
                                  identification number (or a TIN has not been issued to me but I have
                                  mailed or delivered an application to receive a TIN or intend to do so
                                  in the near future), (2) I am not subject to backup withholding either
                                  because I have not been notified by the Internal Revenue Service (the
                                  "IRS") that I am subject to backup withholding as a result of a
                                  failure to report all interest or dividends or the IRS has notified me
Form W-9                          that I am no longer subject to backup withholding and (3) all other
Department of the Treasury        information provided on this form is true, correct and complete.
Internal Revenue Service          SIGNATURE DATE, 1996
                                  You must cross out item (2) above if you have been notified by the IRS
                                  that you are currently subject to backup withholding because of
                                  underreporting interest or dividends on your tax return.
                                  NOTE: FAILURE TO COMPLETE AND RETURN THIS FORM MAY RESULT IN BACKUP
                                  WITHHOLDING OF 31% OF ANY PAYMENTS MADE TO YOU PURSUANT TO THE OFFER.
                                  PLEASE REVIEW THE ENCLOSED GUIDELINES FOR CERTIFICATION OF TAXPAYER
PAYER'S REQUEST FOR TAXPAYER      IDENTIFICATION NUMBER ON SUBSTITUTE FORM W-9 FOR ADDITIONAL DETAILS.
IDENTIFICATION NUMBER (TIN)       YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU CHECKED THE BOX IN
AND CERTIFICATION                 PART 2 OF SUBSTITUTE FORM W-9.
                                          CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER
                                  I certify under penalties of perjury that a taxpayer identification
                                  number has not been issued to me and either (1) I have mailed or
                                  delivered an application to receive a taxpayer identification number
                                  to the appropriate Internal Revenue Service Center or Social Security
                                  Administration Office or (2) I intend to do so in the near future. I
                                  understand that if I do not provide a taxpayer identification number
                                  by the time of payment, 31% of all payments of the purchase price made
                                  to me will be withheld until I provide a number.
                                  SIGNATURE DATE, 1996
</TABLE>
 
                              THE DEALER MANAGERS:
 
<TABLE>
<S>                                                 <C>
                SMITH BARNEY INC.                                  MORGAN STANLEY & CO.
               388 Greenwich Street                                    INCORPORATED
             New York, New York 10013                                 1585 Broadway
                  (800) 655-4811                                 New York, New York 10036
            Attention: Paul S. Galant                           (800) 223-2440, Ext. 1965
                                                                 Attention: Steve Sahara
</TABLE>
 
                             THE INFORMATION AGENT:
 
                                     [LOGO]
                                156 Fifth Avenue
                            New York, New York 10010
                         (212) 929-5500 (Call Collect)
                        Call Toll Free -- (800) 322-2885
<PAGE>
                        LETTER OF TRANSMITTAL AND PROXY
                                  TO ACCOMPANY
             SHARES OF 4 3/4% SERIES CUMULATIVE PREFERRED STOCK OF
 
                     THE CINCINNATI GAS & ELECTRIC COMPANY
 
              TENDERED PURSUANT TO THE OFFER TO PURCHASE FOR CASH
                                       BY
                                 CINERGY CORP.,
                    DATED AUGUST 20, 1996, FOR PURCHASE AT A
                       PURCHASE PRICE OF $80.00 PER SHARE
 
                                     AND/OR
 
                     VOTED PURSUANT TO THE PROXY STATEMENT
                                       OF
                     THE CINCINNATI GAS & ELECTRIC COMPANY
 
    THE  OFFER AND  WITHDRAWAL RIGHTS  WILL EXPIRE AT  5:00 P.M.,  NEW YORK CITY
TIME, ON WEDNESDAY, SEPTEMBER 18, 1996, UNLESS THE OFFER IS EXTENDED.
 
    THE PROXY CONTAINED IN THIS DOCUMENT IS IN RESPECT OF THE SPECIAL MEETING OF
SHAREHOLDERS TO BE  HELD ON SEPTEMBER  18, 1996, OR  ON SUCH DATE  TO WHICH  THE
MEETING IS ADJOURNED OR POSTPONED.
 
                      TO: THE BANK OF NEW YORK, DEPOSITARY
 
<TABLE>
<S>                                                      <C>
                       BY MAIL:                                       BY HAND OR OVERNIGHT COURIER:
             Tender & Exchange Department                             Tender & Exchange Department
                    P.O. Box 11248                                         101 Barclay Street
                 Church Street Station                                 Receive and Deliver Window
             New York, New York 10286-1248                              New York, New York 10286
</TABLE>
 
                           BY FACSIMILE TRANSMISSION:
 
                                 (212) 815-6213
 
                     INFORMATION AND CONFIRM BY TELEPHONE:
 
                                 (800) 507-9357
 
    CINERGY  WILL NOT BE  REQUIRED TO ACCEPT  FOR PAYMENT OR  PAY FOR ANY SHARES
TENDERED IF THE PROPOSED  AMENDMENT IS NOT APPROVED  AND ADOPTED AT THE  SPECIAL
MEETING.  PREFERRED  SHAREHOLDERS  HAVE  THE  RIGHT  TO  VOTE  FOR  THE PROPOSED
AMENDMENT REGARDLESS OF WHETHER THEY TENDER  THEIR SHARES BY CASTING THEIR  VOTE
AND  SIGNING THE PROXY CONTAINED WITHIN THIS  LETTER OF TRANSMITTAL AND PROXY OR
BY VOTING  IN  PERSON AT  THE  SPECIAL MEETING.  IF  THE PROPOSED  AMENDMENT  IS
APPROVED  AND ADOPTED, CG&E WILL  MAKE A SPECIAL CASH  PAYMENT TO EACH PREFERRED
SHAREHOLDER WHO VOTED IN  FAVOR OF THE PROPOSED  AMENDMENT, PROVIDED THAT  THEIR
SHARES ARE NOT TENDERED PURSUANT TO THE OFFER.
 
    NOTE:  SIGNATURES  MUST  BE  PROVIDED BELOW.  PLEASE  READ  THE ACCOMPANYING
INSTRUCTIONS CAREFULLY.
 
    The undersigned hereby appoints  Jackson H. Randolph,  James E. Rogers,  and
William  J. Grealis, or any of them, as  proxies, each with the power to appoint
his substitute,  and  hereby  authorizes  them  to  represent  and  to  vote  as
designated  hereunder and in their discretion with respect to any other business
properly brought  before  the Special  Meeting,  all the  shares  of  cumulative
preferred  stock of  The Cincinnati  Gas &  Electric Company  ("CG&E") which the
undersigned is entitled  to vote at  the Special Meeting  of Shareholders to  be
held on September 18, 1996, or any adjournment(s) or postponement(s) thereof.
 
    NOTE:  IF YOU  ARE VOTING BUT  NOT TENDERING  SHARES, DO NOT  SEND ANY SHARE
CERTIFICATES WITH THIS LETTER OF TRANSMITTAL AND PROXY.
 
    THIS LETTER OF TRANSMITTAL AND PROXY IS SOLICITED ON BEHALF OF THE BOARD  OF
DIRECTORS  OF CG&E. The proxy contained  herein, when properly executed, will be
voted in the  manner directed herein  by the undersigned  shareholder(s). If  no
direction is made, the proxy will be voted FOR Item 1.
 
    Indicate  your vote by an (X). The  Board of Directors recommends voting FOR
Item 1.
<PAGE>
ITEM 1.
 
    To remove from the Amended Articles of Incorporation Article Fourth,  Clause
6-A(b)  in  its  entirety,  which  limits  CG&E's  ability  to  issue  unsecured
indebtedness.
 
             / / FOR             / / AGAINST             / / ABSTAIN
 
                NAME(S) AND ADDRESS(ES) OF REGISTERED HOLDER(S)
 
    SHARES REPRESENTED  BY  ALL  PROPERLY  EXECUTED PROXIES  WILL  BE  VOTED  IN
ACCORDANCE WITH INSTRUCTIONS APPEARING ON THIS PROXY. IN THE ABSENCE OF SPECIFIC
INSTRUCTIONS,  PROXIES WILL BE  VOTED IN ACCORDANCE  WITH THE RECOMMENDATIONS OF
THE BOARD OF DIRECTORS,  AND IN THE  DISCRETION OF THE PROXY  HOLDERS AS TO  ANY
OTHER MATTERS THAT MAY PROPERLY COME BEFORE THE SPECIAL MEETING.
 
Please check box if you plan to attend the Special Meeting. / /
 
                            SIGNATURE(S) OF OWNER(S)
 
X
- --------------------------------------------------------------------------------
X
- --------------------------------------------------------------------------------
Dated: ___________________________________________________________________, 1996
Name(s): _______________________________________________________________________
 
- --------------------------------------------------------------------------------
                                 (PLEASE PRINT)
Capacity (full title): _________________________________________________________
Address: _______________________________________________________________________
 
- --------------------------------------------------------------------------------
                               (INCLUDE ZIP CODE)
DAYTIME Area Code and Telephone No.: ___________________________________________
 
(Must  be signed by the registered holder(s) exactly as name(s) appear(s) on the
stock  certificate(s)  or  on  a  security  position  listing  or  by  person(s)
authorized   to  become  registered  holder(s)  by  certificates  and  documents
transmitted herewith. If  signature is  by a  trustee, executor,  administrator,
guardian, attorney-in-fact, officer of a corporation or other person acting in a
fiduciary  or  representative  capacity, please  set  forth full  title  and see
Instruction 5.)
<TABLE>
<S>                                               <C>
                                  DESCRIPTION OF SHARES TENDERED
  (IF TENDERING SHARES, PLEASE FILL IN EXACTLY AS INFORMATION APPEARS ON CERTIFICATE(S)) (ATTACH
                               ADDITIONAL SIGNED LIST IF NECESSARY)
                                                               TOTAL NUMBER OF SHARES
             CERTIFICATE NUMBER(S)*                        REPRESENTED BY CERTIFICATE(S)*
 
<CAPTION>
                                  DESCRIPTION OF
  (IF TENDERING SHARES, PLEASE FILL IN EXACTLY A
                               ADDITIONAL SIGNED
             CERTIFICATE NUMBER(S)*                         NUMBER OF SHARES TENDERED**
</TABLE>
 
 *Need not be completed by shareholders tendering by book-entry transfer.
<PAGE>
**Unless otherwise indicated, it will be assumed that all Shares represented by
  any certificates delivered to the Depositary are being tendered. See
  Instruction 4.
 
              GUARANTEE OF SIGNATURE(S) (SEE INSTRUCTIONS 1 AND 5)
Authorized Signature: __________________________________________________________
Name: __________________________________________________________________________
Name of Firm: __________________________________________________________________
Address of Firm: _______________________________________________________________
Area Code and Telephone No.: ___________________________________________________
Dated: ___________________________________________________________________, 1996
 
NOTE: IF SHARES ARE BEING TENDERED, THE REMAINDER OF THIS LETTER OF  TRANSMITTAL
      AND PROXY MUST BE COMPLETED, INCLUDING, IF APPLICABLE, THE SUBSTITUTE FORM
      W-9 BELOW.
 
    DELIVERY OF THIS LETTER OF TRANSMITTAL AND PROXY TO AN ADDRESS OTHER THAN AS
SET  FORTH ABOVE  OR TRANSMISSION OF  INSTRUCTIONS VIA A  FACSIMILE NUMBER OTHER
THAN ONE LISTED ABOVE WILL NOT CONSTITUTE  A VALID DELIVERY. YOU MUST SIGN  THIS
LETTER OF TRANSMITTAL AND PROXY IN THE APPROPRIATE SPACE THEREFOR PROVIDED ABOVE
AND, IF YOU ARE TENDERING ANY SHARES, COMPLETE THE SUBSTITUTE FORM W-9 SET FORTH
BELOW  OR  A FORM  W-8,  AS APPLICABLE.  SEE  INSTRUCTION 8  AND  "IMPORTANT TAX
INFORMATION" BELOW.
 
    DO NOT SEND  ANY CERTIFICATES  TO SMITH BARNEY  INC., MORGAN  STANLEY &  CO.
INCORPORATED,  MACKENZIE PARTNERS, INC.,  CINERGY CORP. OR  THE CINCINNATI GAS &
ELECTRIC COMPANY.
 
    THE INSTRUCTIONS ACCOMPANYING THIS LETTER OF TRANSMITTAL AND PROXY SHOULD BE
READ CAREFULLY BEFORE THIS LETTER OF TRANSMITTAL AND PROXY IS COMPLETED.
 
    This Letter of Transmittal and Proxy is to  be used (a) if Shares are to  be
voted  but not tendered, or (b) if  certificates are to be forwarded herewith or
(c) if  delivery  of  tendered Shares  (as  defined  below) is  to  be  made  by
book-entry  transfer to the Depositary's account at The Depository Trust Company
("DTC")  or  Philadelphia   Depository  Trust   Company  ("PDTC")   (hereinafter
collectively  referred to as  the "Book-Entry Transfer  Facilities") pursuant to
the procedures set forth under the heading "Terms of the Offer -- Procedure  for
Tendering  Shares"  in the  Offer to  Purchase and  Proxy Statement  (as defined
below).
 
    Preferred Shareholders  who wish  to tender  Shares yet  who cannot  deliver
their  Shares and all other  documents required hereby to  the Depositary by the
Expiration Date (as defined in the  Offer to Purchase and Proxy Statement)  must
tender  their Shares  pursuant to  the guaranteed  delivery procedure  set forth
under the heading "Terms of the Offer -- Procedure for Tendering Shares" in  the
Offer  to Purchase and Proxy Statement. See Instruction 2. DELIVERY OF DOCUMENTS
TO CINERGY,  THE CINCINNATI  GAS &  ELECTRIC COMPANY  OR A  BOOK-ENTRY  TRANSFER
FACILITY DOES NOT CONSTITUTE A VALID DELIVERY.
 
              (BOXES BELOW FOR USE BY ELIGIBLE INSTITUTIONS ONLY)
 
<TABLE>
<S>        <C>
/ /        CHECK  HERE IF TENDERED SHARES ARE BEING DELIVERED BY BOOK-ENTRY TRANSFER TO THE DEPOSITARY'S ACCOUNT AT
           ONE OF THE BOOK-ENTRY TRANSFER FACILITIES AND COMPLETE THE FOLLOWING:
           Name of tendering institution
           Check applicable box:
           / / DTC / / PDTC
           Account No.
           Transaction Code No.
/ /        CHECK HERE IF TENDERED SHARES ARE BEING DELIVERED PURSUANT TO A NOTICE OF GUARANTEED DELIVERY AND  PROXY
           PREVIOUSLY SENT TO THE DEPOSITARY AND COMPLETE THE FOLLOWING:
</TABLE>
 
Name(s) of tendering shareholder(s) ____________________________________________
 
Date of execution of Notice of Guaranteed Delivery and Proxy ___________________
 
Name of institution that guaranteed delivery ___________________________________
 
If delivery is by book-entry transfer:
 
Name of tendering institution __________________________________________________
 
Account no. ________________________________________ at
/ / DTC  / / PDTC
 
Transaction Code No. ___________________________________________________________
 
                    NOTE: SIGNATURES MUST BE PROVIDED ABOVE.
              PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY.
 
Ladies and Gentlemen:
 
    The  abovesigned  hereby tenders  to Cinergy  Corp., a  Delaware corporation
("Cinergy"), the  shares in  the amount  set  forth in  the box  above  labelled
"Description of Shares Tendered" pursuant to Cinergy's offer to purchase any and
all of the outstanding shares of the series of cumulative preferred stock of The
Cincinnati  Gas  &  Electric Company,  an  Ohio corporation  and  direct utility
subsidiary of Cinergy ("CG&E"), shown on the first page hereof as to which  this
Letter  of Transmittal  and Proxy is  applicable (the "Shares")  at the purchase
price per Share shown on the first page hereof, net to the seller in cash,  upon
the  terms and subject to the conditions set  forth in the Offer to Purchase and
Proxy Statement,  dated  August 20,  1996  (the  "Offer to  Purchase  and  Proxy
Statement"),  receipt of  which is  hereby acknowledged,  and in  this Letter of
Transmittal and  Proxy (which  as to  the  Shares, together  with the  Offer  to
Purchase   and  Proxy  Statement,  constitutes  the  "Offer").  WHILE  PREFERRED
SHAREHOLDERS WHO WISH TO TENDER THEIR SHARES PURSUANT TO THE OFFER NEED NOT VOTE
IN   FAVOR   OF   THE   PROPOSED   AMENDMENT   TO   CG&E'S   AMENDED    ARTICLES
<PAGE>
OF INCORPORATION, AS SET FORTH IN THE OFFER TO PURCHASE AND PROXY STATEMENT (THE
"PROPOSED  AMENDMENT"),  THE OFFER  IS CONDITIONED  UPON THE  PROPOSED AMENDMENT
BEING APPROVED AND ADOPTED AT  THE SPECIAL MEETING (AS  DEFINED IN THE OFFER  TO
PURCHASE  AND PROXY STATEMENT). See "Proposed Amendment and Proxy Solicitation",
"Terms of the Offer -- Extension of Tender Period; Termination; Amendments"  and
"Terms of the Offer -- Certain Conditions of the Offer" in the Offer to Purchase
and Proxy Statement.
 
    Subject  to, and effective  upon, acceptance for payment  of and payment for
the Shares tendered  herewith in accordance  with the terms  and subject to  the
conditions  of the Offer  (including, if the  Offer is extended  or amended, the
terms and conditions of any such extension or amendment), the abovesigned hereby
sells, assigns and transfers to, or upon the order of, Cinergy all right,  title
and  interest in and to all the Shares that are being tendered hereby and hereby
constitutes and appoints The  Bank of New York  (the "Depositary") the true  and
lawful  agent  and  attorney-in-fact of  the  abovesigned with  respect  to such
Shares, with  full  power of  substitution  (such  power of  attorney  being  an
irrevocable  power coupled  with an interest),  to (a)  deliver certificates for
such Shares,  or  transfer  ownership  of  such  Shares  on  the  account  books
maintained  by any of the Book-Entry  Transfer Facilities, together, in any such
case, with all accompanying evidences of  transfer and authenticity, to or  upon
the  order of Cinergy, (b) present such  Shares for registration and transfer on
the books of CG&E and (c) receive all benefits and otherwise exercise all rights
of beneficial ownership of such Shares, all in accordance with the terms of  the
Offer.
 
    The abovesigned hereby represents and warrants that the abovesigned has full
power  and authority  to tender, sell,  assign and transfer  the Shares tendered
hereby and that, when  and to the  extent the same are  accepted for payment  by
Cinergy,  Cinergy will acquire good,  marketable and unencumbered title thereto,
free and clear  of all liens,  restrictions, charges, encumbrances,  conditional
sales  agreements or other obligations relating to the sale or transfer thereof,
and the same will not  be subject to any  adverse claims. The abovesigned  will,
upon  request,  execute  and  deliver any  additional  documents  deemed  by the
Depositary or  Cinergy  to be  necessary  or  desirable to  complete  the  sale,
assignment and transfer of the Shares tendered hereby.
 
    All  authority  herein conferred  or  agreed to  be  conferred shall  not be
affected by, and shall survive the  death or incapacity of the abovesigned,  and
any  obligations of the  abovesigned hereunder shall be  binding upon the heirs,
personal representatives, successors and assigns  of the abovesigned. Except  as
stated in the Offer, this tender is irrevocable.
 
    The  abovesigned understands that  tenders of Shares pursuant  to any one of
the procedures described under the heading "Terms of the Offer -- Procedure  for
Tendering  Shares"  in the  Offer to  Purchase  and Proxy  Statement and  in the
instructions hereto will  constitute the abovesigned's  acceptance of the  terms
and  conditions  of the  Offer, including  the abovesigned's  representation and
warranty that (a) the abovesigned  has a net long  position in the Shares  being
tendered  within  the meaning  of Rule  14e-4  promulgated under  the Securities
Exchange Act of 1934,  as amended, and  (b) the tender  of such Shares  complies
with Rule 14e-4. Cinergy's acceptance for payment of Shares tendered pursuant to
the  Offer  will  constitute a  binding  agreement between  the  abovesigned and
Cinergy upon the terms and subject to the conditions of the Offer.
 
    The abovesigned recognizes  that, under certain  circumstances set forth  in
the  Offer to Purchase and  Proxy Statement, Cinergy may  terminate or amend the
Offer or may not be required to  purchase any of the Shares tendered hereby.  In
either event, the abovesigned understands that certificate(s) for any Shares not
tendered or not purchased will be returned to the abovesigned.
 
    Unless  otherwise  indicated in  the box  below  under the  heading "Special
Payment Instructions", please  issue the  check for  the purchase  price of  any
Shares purchased, and/or return any Shares not tendered or not purchased, in the
name(s)  of the abovesigned (and,  in the case of  Shares tendered by book-entry
transfer,  by  credit  to  the  account  at  the  Book-Entry  Transfer  Facility
designated above). Unless otherwise indicated in the box below under the heading
"Special Delivery Instructions", please mail the check for the purchase price of
any  Shares purchased  and/or any  certificates for  Shares not  tendered or not
purchased (and accompanying documents, as appropriate) to the abovesigned at the
address shown  below  the  abovesigned  signature(s). In  the  event  that  both
"Special   Payment  Instructions"   and  "Special   Delivery  Instructions"  are
completed, please issue the check for the purchase price of any Shares purchased
and/or return any Shares not  tendered or not purchased  in the name(s) of,  and
mail  said check  and/or any  certificates to,  the person(s)  so indicated. The
abovesigned recognizes that Cinergy has no obligation, pursuant to the  "Special
Payment  Instructions", to transfer  any Shares from the  name of the registered
holder(s) thereof if Cinergy does  not accept for payment  any of the Shares  so
tendered.
 
<TABLE>
<S>                                                     <C>
             SPECIAL PAYMENT INSTRUCTIONS                           SPECIAL DELIVERY INSTRUCTIONS
            (SEE INSTRUCTIONS 4, 6 AND 7)                           (SEE INSTRUCTIONS 4, 6 AND 7)
 
    To be completed ONLY if the check for the purchase  To  be completed  ONLY if  the check  for the purchase
price of  Shares  purchased  and/or  certificates  for  price  of  Shares  purchased  and/or  certificates for
Shares not tendered or not purchased are to be  issued  Shares  not tendered or not purchased are to be mailed
in the name of someone other than the abovesigned.      to someone  other  than  the  abovesigned  or  to  the
                                                        abovesigned  at an address other than that shown below
                                                        the abovesigned's signature(s).
 
Issue  / / check and/or                                 Mail  / / check and/or
      / / certificate(s) to:                            / / certificate(s) to:
Name                                                    Name
                    (PLEASE PRINT)                                          (PLEASE PRINT)
 
Address                                                 Address
 
                     (INCLUDE ZIP CODE)                                   (INCLUDE ZIP CODE)
 
             (TAXPAYER IDENTIFICATION OR
               SOCIAL SECURITY NUMBER)
</TABLE>
 
<TABLE>
<S>        <C>
/ /        CHECK HERE IF ANY OF THE  CERTIFICATES REPRESENTING SHARES THAT YOU OWN  AND WISH TO TENDER HAVE BEEN  LOST,
           DESTROYED OR STOLEN. (SEE INSTRUCTION 12.)
           Number of Shares represented by lost, destroyed or stolen certificates:
</TABLE>
 
<PAGE>
                               SOLICITED TENDERS
                              (SEE INSTRUCTION 10)
 
    As provided in Instruction 10, Cinergy will pay to any Soliciting Dealer, as
defined  in Instruction 10, a  solicitation fee of $1.50  per Share (except that
for transactions  for beneficial  owners  equal to  or exceeding  5,000  Shares,
Cinergy will pay a solicitation fee of $1.25 per Share) for any Shares tendered,
accepted for payment and paid pursuant to the Offer. However, Soliciting Dealers
will not be entitled to a solicitation fee for Shares beneficially owned by such
Soliciting Dealer.
 
    The  undersigned represents that  the Soliciting Dealer  which solicited and
obtained this tender is:
 
Name of Firm: __________________________________________________________________
                                      (PLEASE PRINT)
 
Name of Individual Broker
or Financial Consultant: _______________________________________________________
 
Telephone Number of Broker
or Financial Consultant: _______________________________________________________
 
Identification Number (if known): ______________________________________________
 
Address: _______________________________________________________________________
                                   (INCLUDE ZIP CODE)
 
    The following to be completed ONLY if customer's Shares held in nominee name
are tendered.
 
<TABLE>
<S>                                                      <C>
NAME OF BENEFICIAL OWNER                                 NUMBER OF SHARES TENDERED
                                     (ATTACH ADDITIONAL LIST IF NECESSARY)
- -------------------------------------------------------  -------------------------------------------------------
- -------------------------------------------------------  -------------------------------------------------------
- -------------------------------------------------------  -------------------------------------------------------
</TABLE>
 
    The acceptance of compensation by  such Soliciting Dealer will constitute  a
representation  by it that (a) it  has complied with the applicable requirements
of the Securities Exchange Act of 1934, as amended, and the applicable rules and
regulations thereunder, in connection with such solicitation; (b) it is entitled
to such compensation for such solicitation under the terms and conditions of the
Offer to  Purchase;  (c)  in  soliciting  tenders of  Shares,  it  has  used  no
soliciting  materials other than those furnished by  Cinergy; and (d) if it is a
foreign broker or dealer not eligible for membership in the National Association
of Securities Dealers, Inc. (the "NASD"), it has agreed to conform to the NASD's
Rules of Fair Practice in making solicitations.
 
    The payment of compensation  to any Soliciting Dealer  is dependent on  such
Soliciting Dealer returning a Notice of Solicited Tenders to the Depositary.
 
                 (IF SHARES ARE BEING TENDERED, PLEASE COMPLETE
            SUBSTITUTE FORM W-9 BELOW OR A FORM W-8, AS APPLICABLE)
 
SIGN HERE: _____________________________________________________________________
<PAGE>
                                  INSTRUCTIONS
 
             FORMING PART OF THE TERMS AND CONDITIONS OF THE OFFER
 
    1.    GUARANTEE OF  SIGNATURES.   Except  as  otherwise provided  below, all
signatures on this Letter of Transmittal and Proxy must be guaranteed by a  firm
that  is a member of  a registered national securities  exchange or the National
Association of  Securities Dealers,  Inc.,  or by  a  commercial bank  or  trust
company  having  an office  or correspondent  in  the United  States which  is a
participant in an approved Signature  Guarantee Medallion Program (an  "Eligible
Institution").  Signatures on this  Letter of Transmittal and  Proxy need not be
guaranteed (a)  if  this  Letter of  Transmittal  and  Proxy is  signed  by  the
registered  holder(s) of the Shares (which  term, for purposes of this document,
shall include any participant in one of the Book-Entry Transfer Facilities whose
name appears on  a security position  listing as the  owner of Shares)  tendered
herewith  and such holder(s) has  not completed the box  above under the heading
"Special Payment  Instructions" or  the  box above  under the  heading  "Special
Delivery  Instructions" on  this Letter  of Transmittal  and Proxy,  (b) if such
Shares are tendered for the  account of an Eligible  Institution or (c) if  this
Letter  of Transmittal and Proxy is being  used solely for the purpose of voting
Shares which are not being tendered pursuant to the Offer. See Instruction 5.
 
    2.  DELIVERY OF LETTER OF TRANSMITTAL AND PROXY AND SHARES.  This Letter  of
Transmittal  and Proxy  is to be  used if  (a) certificates are  to be forwarded
herewith, (b) delivery of Shares is  to be made by book-entry transfer  pursuant
to  the procedures set forth under the  heading "Terms of the Offer -- Procedure
for Tendering Shares" in the Offer to Purchase and Proxy Statement or (c) Shares
are being voted in  connection with the Offer.  Certificates for all  physically
delivered   Shares,  or  a  confirmation  of  a  book-entry  transfer  into  the
Depositary's account at one of the Book-Entry Transfer Facilities of all  Shares
delivered  electronically, as  well as  a properly  completed and  duly executed
Letter of Transmittal and Proxy (or  facsimile thereof) and any other  documents
required  by  this Letter  of Transmittal  and  Proxy, must  be received  by the
Depositary at one of its addresses set forth on the front page of this Letter of
Transmittal and Proxy  on or prior  to the  Expiration Date (as  defined in  the
Offer  to Purchase  and Proxy Statement)  with respect to  all Shares. Preferred
Shareholders who wish to tender their Shares yet who cannot deliver their Shares
and all other required documents to the Depositary on or prior to the Expiration
Date must tender their Shares pursuant to the guaranteed delivery procedure  set
forth  under the heading "Terms of the  Offer -- Procedure for Tendering Shares"
in the Offer to  Purchase and Proxy Statement.  Pursuant to such procedure:  (a)
such  tender must be made by or  through an Eligible Institution, (b) a properly
completed and duly executed Notice of Guaranteed Delivery and Proxy in the  form
provided by Cinergy (with any required signature guarantees) must be received by
the  Depositary  on or  prior  to the  applicable  Expiration Date  and  (c) the
certificates for  all  physically  delivered  Shares, or  a  confirmation  of  a
book-entry  transfer  into the  Depositary's account  at  one of  the Book-Entry
Transfer Facilities  of  all  Shares  delivered electronically,  as  well  as  a
properly  completed  and  duly  executed Letter  of  Transmittal  and  Proxy (or
facsimile  thereof)  and  any  other  documents  required  by  this  Letter   of
Transmittal  and Proxy must be received by the Depositary by 5:00 p.m. (New York
City time) within three New York Stock  Exchange trading days after the date  of
execution of such Notice of Guaranteed Delivery and Proxy, all as provided under
the  heading "Terms of the Offer -- Procedure for Tendering Shares" in the Offer
to Purchase and Proxy Statement.
 
    THE METHOD OF DELIVERY OF SHARES AND ALL OTHER REQUIRED DOCUMENTS IS AT  THE
OPTION  AND RISK  OF THE  TENDERING PREFERRED  SHAREHOLDER. IF  CERTIFICATES FOR
SHARES ARE SENT BY MAIL, REGISTERED MAIL WITH RETURN RECEIPT REQUESTED, PROPERLY
INSURED, IS RECOMMENDED.
 
    No alternative,  conditional or  contingent tenders  will be  accepted.  See
"Terms  of  the Offer  --  Number of  Shares;  Purchase Price;  Expiration Date;
Dividends" in  the Offer  to Purchase  and Proxy  Statement. By  executing  this
Letter   of  Transmittal  and  Proxy   (or  facsimile  thereof),  the  tendering
stockholder waives any right to receive any notice of the acceptance for payment
of the Shares.
 
    3.  VOTING.   WHILE PREFERRED SHAREHOLDERS WHO  WISH TO TENDER THEIR  SHARES
PURSUANT TO THE OFFER NEED NOT VOTE IN FAVOR OF THE PROPOSED AMENDMENT TO CG&E'S
AMENDED  ARTICLES OF INCORPORATION,  AS SET FORTH  IN THE OFFER  TO PURCHASE AND
PROXY STATEMENT (THE "PROPOSED  AMENDMENT"), THE OFFER  IS CONDITIONED UPON  THE
PROPOSED AMENDMENT BEING APPROVED AND ADOPTED AT THE SPECIAL MEETING (AS DEFINED
IN   THE  OFFER  TO  PURCHASE  AND  PROXY  STATEMENT).  In  addition,  Preferred
Shareholders have the  right to vote  for the proposed  amendment regardless  of
whether  they tender their Shares by casting  their vote and duly executing this
Letter of Transmittal and Proxy or by  voting in person at the Special  Meeting.
By  executing a Notice of Guaranteed Delivery and Proxy, a Preferred Shareholder
is taken to  have tendered  the Shares described  in such  Notice of  Guaranteed
Delivery  and Proxy and to  have voted such Shares  in accordance with the proxy
contained therein. If  no vote is  indicated on an  otherwise properly  executed
proxy  contained within this Letter of Transmittal and Proxy (or within a Notice
of Guaranteed Delivery and Proxy), then all Shares in respect of such proxy will
be voted in favor of the  Proposed Amendment. See "PROPOSED AMENDMENT AND  PROXY
SOLICITATION"  in the Offer to Purchase and  Proxy Statement. The Offer is being
sent to all persons in whose names Shares are registered on the books of CG&E on
the Record Date (as defined in the Offer to Purchase and Proxy Statement) and on
August 15, 1996. Only a record holder of  Shares on the Record Date may vote  in
person  or by proxy at the Special Meeting  (as defined in the Offer to Purchase
and Proxy Statement). No record date is fixed for determining which persons  are
permitted  to tender Shares. Any person who  is the beneficial owner but not the
record holder of  Shares must  arrange for the  record transfer  of such  Shares
prior to tendering.
 
    4.  PARTIAL TENDERS (NOT APPLICABLE TO SHAREHOLDERS WHO TENDER BY BOOK-ENTRY
TRANSFER).    If  fewer  than  all the  Shares  represented  by  any certificate
delivered to the Depositary  are to be  tendered, fill in  the number of  Shares
that  are to  be tendered  in the  box above  under the  heading "Description of
Shares Tendered".  In such  case, a  new certificate  for the  remainder of  the
Shares  represented by the old certificate will be sent to the person(s) signing
this Letter of Transmittal and Proxy, unless otherwise provided in the box above
under the
<PAGE>
heading "Special Payment  Instructions" or "Special  Delivery Instructions",  as
promptly  as practicable following  the expiration or  termination of the Offer.
All Shares  represented by  certificates  delivered to  the Depositary  will  be
deemed to have been tendered unless otherwise indicated.
 
    5.    SIGNATURES  ON  LETTER  OF  TRANSMITTAL  AND  PROXY  AND/OR  NOTICE OF
GUARANTEED DELIVERY AND PROXY;  STOCK POWERS AND ENDORSEMENTS.   If either  this
Letter  of Transmittal and Proxy or the  Notice of Guaranteed Delivery and Proxy
(together, the  "Tender  and  Proxy  Documents") is  signed  by  the  registered
holder(s)  of the Shares tendered hereby,  the signature(s) must correspond with
the name(s)  as written  on the  face of  the certificates  without  alteration,
enlargement or any change whatsoever.
 
    If  any  of the  Shares  tendered or  voted  under either  Tender  and Proxy
Document is held of record  by two or more persons,  all such persons must  sign
such Tender and Proxy Document.
 
    If  any  of the  Shares  tendered or  voted  under either  Tender  and Proxy
Document is registered in different names or different certificates, it will  be
necessary  to complete, sign  and submit as many  separate applicable Tender and
Proxy Documents as there are different registrations of certificates.
 
    If either Tender and Proxy Document is signed by the registered holder(s) of
the Shares tendered hereby,  no endorsements of  certificates or separate  stock
powers  are required unless payment  of the purchase price is  to be made to, or
Shares not tendered or not  purchased are to be registered  in the name of,  any
person  other than the registered holder(s). Signatures on any such certificates
or stock powers must be guaranteed  by an Eligible Institution. See  Instruction
1.
 
    If this Letter of Transmittal and Proxy is signed by a person other than the
registered  holder(s)  of  the  Shares  tendered  hereby,  certificates  must be
endorsed or  accompanied by  appropriate stock  powers, in  either case,  signed
exactly as the name(s) of the registered holder(s) appear(s) on the certificates
for  such Shares. Signature(s) on any such  certificates or stock powers must be
guaranteed by an Eligible Institution. See Instruction 1.
 
    If either Tender  and Proxy Document  or any certificate  or stock power  is
signed  by  a  trustee,  executor,  administrator,  guardian,  attorney-in-fact,
officer of a corporation or other person acting in a fiduciary or representative
capacity, such  person should  so  indicate when  signing, and  proper  evidence
satisfactory  to  Cinergy of  the authority  of such  person so  to act  must be
submitted.
 
    6.   STOCK TRANSFER  TAXES.   Except as  set forth  in this  Instruction  6,
Cinergy  will pay or cause  to be paid any stock  transfer taxes with respect to
the sale and transfer of  any Shares to it or  its order pursuant to the  Offer.
If,  however, payment  of the  purchase price is  to be  made to,  or Shares not
tendered or not purchased are to be registered in the name of, any person  other
than  the registered holder(s), or if tendered Shares are registered in the name
of any person other  than the person(s) signing  this Letter of Transmittal  and
Proxy, the amount of any stock transfer taxes (whether imposed on the registered
holder(s), such other person or otherwise) payable on account of the transfer to
such  person  will  be  deducted from  the  purchase  price  unless satisfactory
evidence of the payment of such taxes, or exemption therefrom, is submitted. See
"Terms of the Offer -- Acceptance of Shares for Payment and Payment of  Purchase
Price  and Dividend"  in the  Offer to Purchase  and Proxy  Statement. EXCEPT AS
PROVIDED IN THIS INSTRUCTION 6, IT WILL  NOT BE NECESSARY TO AFFIX TRANSFER  TAX
STAMPS TO THE CERTIFICATES REPRESENTING SHARES TENDERED HEREBY.
 
    7.    SPECIAL PAYMENT  AND  DELIVERY INSTRUCTIONS.    If the  check  for the
purchase price of any Shares  purchased is to be issued  in the name of,  and/or
any  Shares not tendered or not purchased are  to be returned to, a person other
than the person(s) signing this Letter of Transmittal and Proxy or if the  check
and/or any certificate for Shares not tendered or not purchased are to be mailed
to someone other than the person(s) signing this Letter of Transmittal and Proxy
or  to an  address other  than that  shown in  the box  above under  the heading
"Name(s) and Address(es)  of Registered  Holder(s)", then  the "Special  Payment
Instructions"   and/or  "Special  Delivery  Instructions"   on  this  Letter  of
Transmittal and  Proxy should  be  completed. Preferred  Shareholders  tendering
Shares  by book-entry  transfer will  have any  Shares not  accepted for payment
returned by crediting the  account maintained by  such Preferred Shareholder  at
the Book-Entry Transfer Facility from which such transfer was made.
 
    8.   SUBSTITUTE FORM W-9 AND FORM  W-8.  The tendering Preferred Shareholder
is  required  to  provide  the   Depositary  with  either  a  correct   Taxpayer
Identification  Number ("TIN") on  Substitute Form W-9,  which is provided under
"Important Tax Information" below, or a properly completed Form W-8. Failure  to
provide  the information on either  Substitute Form W-9 or  Form W-8 may subject
the tendering Preferred Shareholder to 31% federal income tax backup withholding
on the payment  of the  purchase price  for the  Shares. The  box in  Part 2  of
Substitute  Form W-9 may  be checked if the  tendering Preferred Shareholder has
not been issued a  TIN and has applied  for a number or  intends to apply for  a
number in the near future. If the box in Part 2 is checked and the Depositary is
not provided with a TIN by the time of payment, the Depositary will withhold 31%
on  all payments of the purchase price for  the Shares thereafter until a TIN is
provided to the Depositary.
 
    9.  REQUESTS FOR ASSISTANCE OR ADDITIONAL COPIES.  Any questions or requests
for assistance may be directed to  the Information Agent or the Dealer  Managers
at  their respective telephone numbers and  addresses listed below. Requests for
additional copies of the Offer to  Purchase and Proxy Statement, this Letter  of
Transmittal  and Proxy or  other tender offer  materials may be  directed to the
Information Agent  or the  Dealer Managers  and such  copies will  be  furnished
promptly  at Cinergy's  expense. Preferred  Shareholders may  also contact their
local broker, dealer, commercial bank or trust company for assistance concerning
the Offer.
 
    10.  SOLICITED TENDERS.   Cinergy will pay a  solicitation fee of $1.50  per
Share  (except that for transactions for beneficial owners equal to or exceeding
5,000 Shares, Cinergy will pay  a solicitation fee of  $1.25 per Share) for  any
Shares tendered, accepted for payment and paid pursuant to the Offer, covered by
the  Letter  of  Transmittal  and  Proxy  which  designates,  under  the heading
"Solicited Tenders", as having  solicited and obtained the  tender, the name  of
<PAGE>
(a)  any  broker or  dealer in  securities,  including a  Dealer Manager  in its
capacity as a dealer  or broker, which  is a member  of any national  securities
exchange  or  of  the  National Association  of  Securities  Dealers,  Inc. (the
"NASD"), (b) any  foreign broker or  dealer not eligible  for membership in  the
NASD  which agrees to conform to the NASD's Rules of Fair Practice in soliciting
tenders outside the United States to the  same extent as though it were an  NASD
member, or (c) any bank or trust company (each of which is referred to herein as
a "Soliciting Dealer"). No such fee shall be payable to a Soliciting Dealer with
respect to the tender of Shares by a holder unless the Letter of Transmittal and
Proxy  accompanying such tender  designates such Soliciting  Dealer. No such fee
shall be payable to a Soliciting Dealer  in respect of Shares registered in  the
name  of such Soliciting Dealer  unless such Shares are  held by such Soliciting
Dealer as nominee and such Shares are  being tendered for the benefit of one  or
more  beneficial owners identified on the Letter  of Transmittal and Proxy or on
the Notice of Solicited Tenders (included  in the materials provided to  brokers
and  dealers). No such fee shall be  payable to a Soliciting Dealer with respect
to the  tender of  Shares  by the  holder  of record,  for  the benefit  of  the
beneficial  owner, unless  the beneficial  owner has  designated such Soliciting
Dealer. If  tendered Shares  are  being delivered  by book-entry  transfer,  the
Soliciting  Dealer must return  a Notice of Solicited  Tenders to the Depositary
within  three  business  days  after  expiration  of  the  Offer  to  receive  a
solicitation  fee. No such fee  shall be payable to  a Soliciting Dealer if such
Soliciting Dealer is required for any reason to transfer the amount of such  fee
to  a depositing  holder (other  than itself). No  such fee  shall be  paid to a
Soliciting Dealer with respect to  Shares tendered for such Soliciting  Dealer's
own account. No broker, dealer, bank, trust company or fiduciary shall be deemed
to  be the agent of Cinergy, the Depositary, the Information Agent or the Dealer
Managers for purposes of the Offer.
 
    11.  IRREGULARITIES.   All questions  as to  the form of  documents and  the
validity,  eligibility (including time of receipt)  and acceptance of any tender
of Shares  will  be determined  by  Cinergy, in  its  sole discretion,  and  its
determination shall be final and binding. Cinergy reserves the absolute right to
reject  any and all tenders of Shares that  it determines are not in proper form
or the acceptance for payment of or payment for Shares that may, in the  opinion
of  Cinergy's counsel, be unlawful. Cinergy  also reserves the absolute right to
waive any of the conditions  to the Offer or any  defect or irregularity in  any
tender of Shares and Cinergy's interpretation of the terms and conditions of the
Offer  (including these instructions) shall be final and binding. Unless waived,
any defects or irregularities  in connection with tenders  must be cured  within
such  time as Cinergy shall determine. None of Cinergy, the Dealer Managers, the
Depositary, the Information Agent or any other person shall be under any duty to
give notice of any defect or irregularity in tenders nor shall any of them incur
any liability for failure to give any such notice. Tenders will not be deemed to
have been made until all defects and irregularities have been cured or waived.
 
    12.    LOST,  DESTROYED  OR   STOLEN  CERTIFICATES.    If  any   certificate
representing   Shares  has  been  lost,   destroyed  or  stolen,  the  Preferred
Shareholder  should  promptly  notify  the   Depositary  by  checking  the   box
immediately   following  the   Special  Payment   Instructions/Special  Delivery
Instructions and indicating the number of Shares lost, destroyed or stolen.  The
Preferred  Shareholder will then be instructed as to the procedures that must be
taken in order to replace the certificate. The tender of Shares pursuant to this
Letter of Transmittal and Proxy will not be valid unless prior to the Expiration
Date (as  defined  in the  Offer  to Purchase  and  Proxy Statement):  (a)  such
procedures  have been completed and a replacement certificate for the Shares has
been delivered to  the Depositary  or (b) a  Notice of  Guaranteed Delivery  and
Proxy has been delivered to the Depositary. See Instruction 2.
 
    IMPORTANT:  THIS  LETTER  OF  TRANSMITTAL AND  PROXY  (OR  A  FACSIMILE COPY
HEREOF),  DULY  EXECUTED,   TOGETHER  WITH,  IF   APPLICABLE,  CERTIFICATES   OR
CONFIRMATION  OF BOOK-ENTRY TRANSFER,  AND ALL OTHER  REQUIRED DOCUMENTS MUST BE
RECEIVED BY THE DEPOSITARY, OR, IF APPLICABLE, THE NOTICE OF GUARANTEED DELIVERY
AND PROXY MUST  BE RECEIVED BY  THE DEPOSITARY,  ON OR PRIOR  TO THE  APPLICABLE
EXPIRATION DATE (AS DEFINED IN THE OFFER TO PURCHASE AND PROXY STATEMENT).
 
                           IMPORTANT TAX INFORMATION
 
    Under  federal income tax law, a Preferred Shareholder whose tendered Shares
are accepted for payment is required  to provide the Depositary (as payer)  with
either  such Preferred Shareholder's correct TIN on Substitute Form W-9 below or
a properly completed Form W-8. If  such Preferred Shareholder is an  individual,
the TIN is his or her social security number. For businesses and other entities,
the  number is the federal employer  identification number. If the Depositary is
not provided with the correct TIN or properly completed Form W-8, the  Preferred
Shareholder  may be  subject to  a $50 penalty  imposed by  the Internal Revenue
Service. In addition, payments that are made to such Preferred Shareholder  with
respect  to Shares  purchased pursuant  to the  Offer may  be subject  to backup
withholding. The Form W-8 can be obtained from the Depositary. See the  enclosed
Guidelines  for Certification  of Taxpayer  Identification Number  on Substitute
Form W-9 for additional instructions.
 
    If federal income tax backup withholding applies, the Depositary is required
to withhold  31% of  any  payments made  to  the Preferred  Shareholder.  Backup
withholding  is not an additional tax.  Rather, the federal income tax liability
of persons subject to backup  withholding will be reduced  by the amount of  the
tax withheld. If withholding results in an overpayment of taxes, a refund may be
obtained.
 
PURPOSE OF SUBSTITUTE FORM W-9 AND FORM W-8
 
    To  avoid  backup  withholding on  payments  that  are made  to  a Preferred
Shareholder with  respect  to  Shares  purchased  pursuant  to  the  Offer,  the
Preferred Shareholder is required to notify the Depositary of his or her correct
TIN  by completing the  Substitute Form W-9 attached  hereto certifying that the
TIN provided  on Substitute  Form W-9  is  correct and  that (a)  the  Preferred
Shareholder has not been notified by the Internal Revenue Service that he or she
is  subject to federal income  tax backup withholding as  a result of failure to
report all  interest  or dividends  or  (b)  the Internal  Revenue  Service  has
notified  the  Preferred Shareholder  that he  or  she is  no longer  subject to
federal income tax
<PAGE>
backup withholding.  Foreign  Preferred  Shareholders  must  submit  a  properly
completed  Form  W-8  in  order  to  avoid  the  applicable  backup withholding;
provided, however, that backup withholding  will not apply to foreign  Preferred
Shareholders subject to 30% (or lower treaty rate) withholding on gross payments
received pursuant to the Offer.
 
WHAT NUMBER TO GIVE THE DEPOSITARY
 
    The  Preferred Shareholder  is required  to give  the Depositary  the social
security number or employer identification number of the registered owner of the
Shares. If the Shares are in  more than one name or are  not in the name of  the
actual  owner,  consult the  enclosed Guidelines  for Certification  of Taxpayer
Identification Number on Substitute  Form W-9 for  additional guidance on  which
number to report.
 
                       PAYER'S NAME: THE BANK OF NEW YORK
 
<TABLE>
<S>                               <C>                                  <C>
                                  Part 1 -- PLEASE PROVIDE YOUR TIN        Social Security Number OR
                                  IN THE BOX AT RIGHT AND CERTIFY BY    Employer Identification Number
                                  SIGNING AND DATING BELOW.                           TIN
                                  Name (Please Print)
                                  Address                              Part 2 --
SUBSTITUTE                        City State Zip Code                  Awaiting TIN  / /
                                  Part 3 -- CERTIFICATION -- UNDER THE PENALTIES OF PERJURY, I CERTIFY
                                  THAT: (1) the number shown on this form is my correct taxpayer
                                  identification number (or a TIN has not been issued to me but I have
                                  mailed or delivered an application to receive a TIN or intend to do so
                                  in the near future), (2) I am not subject to backup withholding either
                                  because I have not been notified by the Internal Revenue Service (the
                                  "IRS") that I am subject to backup withholding as a result of a
                                  failure to report all interest or dividends or the IRS has notified me
Form W-9                          that I am no longer subject to backup withholding and (3) all other
Department of the Treasury        information provided on this form is true, correct and complete.
Internal Revenue Service          SIGNATURE DATE, 1996
                                  You must cross out item (2) above if you have been notified by the IRS
                                  that you are currently subject to backup withholding because of
                                  underreporting interest or dividends on your tax return.
                                  NOTE: FAILURE TO COMPLETE AND RETURN THIS FORM MAY RESULT IN BACKUP
                                  WITHHOLDING OF 31% OF ANY PAYMENTS MADE TO YOU PURSUANT TO THE OFFER.
                                  PLEASE REVIEW THE ENCLOSED GUIDELINES FOR CERTIFICATION OF TAXPAYER
PAYER'S REQUEST FOR TAXPAYER      IDENTIFICATION NUMBER ON SUBSTITUTE FORM W-9 FOR ADDITIONAL DETAILS.
IDENTIFICATION NUMBER (TIN)       YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU CHECKED THE BOX IN
AND CERTIFICATION                 PART 2 OF SUBSTITUTE FORM W-9.
                                          CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER
                                  I certify under penalties of perjury that a taxpayer identification
                                  number has not been issued to me and either (1) I have mailed or
                                  delivered an application to receive a taxpayer identification number
                                  to the appropriate Internal Revenue Service Center or Social Security
                                  Administration Office or (2) I intend to do so in the near future. I
                                  understand that if I do not provide a taxpayer identification number
                                  by the time of payment, 31% of all payments of the purchase price made
                                  to me will be withheld until I provide a number.
                                  SIGNATURE DATE, 1996
</TABLE>
 
                              THE DEALER MANAGERS:
 
<TABLE>
<S>                                                 <C>
                SMITH BARNEY INC.                                  MORGAN STANLEY & CO.
               388 Greenwich Street                                    INCORPORATED
             New York, New York 10013                                 1585 Broadway
                  (800) 655-4811                                 New York, New York 10036
            Attention: Paul S. Galant                           (800) 223-2440, Ext. 1965
                                                                 Attention: Steve Sahara
</TABLE>
 
                             THE INFORMATION AGENT:
 
                                     [LOGO]
                                156 Fifth Avenue
                            New York, New York 10010
                         (212) 929-5500 (Call Collect)
                        Call Toll Free -- (800) 322-2885
<PAGE>
                        LETTER OF TRANSMITTAL AND PROXY
                                  TO ACCOMPANY
             SHARES OF 7 7/8% SERIES CUMULATIVE PREFERRED STOCK OF
 
                     THE CINCINNATI GAS & ELECTRIC COMPANY
 
              TENDERED PURSUANT TO THE OFFER TO PURCHASE FOR CASH
                                       BY
                                 CINERGY CORP.,
                    DATED AUGUST 20, 1996, FOR PURCHASE AT A
                      PURCHASE PRICE OF $116.00 PER SHARE
 
                                     AND/OR
 
                     VOTED PURSUANT TO THE PROXY STATEMENT
                                       OF
                     THE CINCINNATI GAS & ELECTRIC COMPANY
 
    THE  OFFER AND  WITHDRAWAL RIGHTS  WILL EXPIRE AT  5:00 P.M.,  NEW YORK CITY
TIME, ON WEDNESDAY, SEPTEMBER 18, 1996, UNLESS THE OFFER IS EXTENDED.
 
    THE PROXY CONTAINED IN THIS DOCUMENT IS IN RESPECT OF THE SPECIAL MEETING OF
SHAREHOLDERS TO BE  HELD ON SEPTEMBER  18, 1996, OR  ON SUCH DATE  TO WHICH  THE
MEETING IS ADJOURNED OR POSTPONED.
 
                      TO: THE BANK OF NEW YORK, DEPOSITARY
 
<TABLE>
<S>                                                      <C>
                       BY MAIL:                                       BY HAND OR OVERNIGHT COURIER:
             Tender & Exchange Department                             Tender & Exchange Department
                    P.O. Box 11248                                         101 Barclay Street
                 Church Street Station                                 Receive and Deliver Window
             New York, New York 10286-1248                              New York, New York 10286
</TABLE>
 
                           BY FACSIMILE TRANSMISSION:
 
                                 (212) 815-6213
 
                     INFORMATION AND CONFIRM BY TELEPHONE:
 
                                 (800) 507-9357
 
    CINERGY  WILL NOT BE  REQUIRED TO ACCEPT  FOR PAYMENT OR  PAY FOR ANY SHARES
TENDERED IF THE PROPOSED  AMENDMENT IS NOT APPROVED  AND ADOPTED AT THE  SPECIAL
MEETING.  PREFERRED  SHAREHOLDERS  HAVE  THE  RIGHT  TO  VOTE  FOR  THE PROPOSED
AMENDMENT REGARDLESS OF WHETHER THEY TENDER  THEIR SHARES BY CASTING THEIR  VOTE
AND  SIGNING THE PROXY CONTAINED WITHIN THIS  LETTER OF TRANSMITTAL AND PROXY OR
BY VOTING  IN  PERSON AT  THE  SPECIAL MEETING.  IF  THE PROPOSED  AMENDMENT  IS
APPROVED  AND ADOPTED, CG&E WILL  MAKE A SPECIAL CASH  PAYMENT TO EACH PREFERRED
SHAREHOLDER WHO VOTED IN  FAVOR OF THE PROPOSED  AMENDMENT, PROVIDED THAT  THEIR
SHARES ARE NOT TENDERED PURSUANT TO THE OFFER.
 
    NOTE:  SIGNATURES  MUST  BE  PROVIDED BELOW.  PLEASE  READ  THE ACCOMPANYING
INSTRUCTIONS CAREFULLY.
 
    The undersigned hereby appoints  Jackson H. Randolph,  James E. Rogers,  and
William  J. Grealis, or any of them, as  proxies, each with the power to appoint
his substitute,  and  hereby  authorizes  them  to  represent  and  to  vote  as
designated  hereunder and in their discretion with respect to any other business
properly brought  before  the Special  Meeting,  all the  shares  of  cumulative
preferred  stock of  The Cincinnati  Gas &  Electric Company  ("CG&E") which the
undersigned is entitled  to vote at  the Special Meeting  of Shareholders to  be
held on September 18, 1996, or any adjournment(s) or postponement(s) thereof.
 
    NOTE:  IF YOU  ARE VOTING BUT  NOT TENDERING  SHARES, DO NOT  SEND ANY SHARE
CERTIFICATES WITH THIS LETTER OF TRANSMITTAL AND PROXY.
 
    THIS LETTER OF TRANSMITTAL AND PROXY IS SOLICITED ON BEHALF OF THE BOARD  OF
DIRECTORS  OF CG&E. The proxy contained  herein, when properly executed, will be
voted in the  manner directed herein  by the undersigned  shareholder(s). If  no
direction is made, the proxy will be voted FOR Item 1.
 
    Indicate  your vote by an (X). The  Board of Directors recommends voting FOR
Item 1.
<PAGE>
ITEM 1.
 
    To remove from the Amended Articles of Incorporation Article Fourth,  Clause
6-A(b)  in  its  entirety,  which  limits  CG&E's  ability  to  issue  unsecured
indebtedness.
 
             / / FOR             / / AGAINST             / / ABSTAIN
 
                NAME(S) AND ADDRESS(ES) OF REGISTERED HOLDER(S)
 
    SHARES REPRESENTED  BY  ALL  PROPERLY  EXECUTED PROXIES  WILL  BE  VOTED  IN
ACCORDANCE WITH INSTRUCTIONS APPEARING ON THIS PROXY. IN THE ABSENCE OF SPECIFIC
INSTRUCTIONS,  PROXIES WILL BE  VOTED IN ACCORDANCE  WITH THE RECOMMENDATIONS OF
THE BOARD OF DIRECTORS,  AND IN THE  DISCRETION OF THE PROXY  HOLDERS AS TO  ANY
OTHER MATTERS THAT MAY PROPERLY COME BEFORE THE SPECIAL MEETING.
 
Please check box if you plan to attend the Special Meeting. / /
 
                            SIGNATURE(S) OF OWNER(S)
 
X
- --------------------------------------------------------------------------------
X
- --------------------------------------------------------------------------------
Dated: ___________________________________________________________________, 1996
Name(s): _______________________________________________________________________
 
- --------------------------------------------------------------------------------
                                 (PLEASE PRINT)
Capacity (full title): _________________________________________________________
Address: _______________________________________________________________________
 
- --------------------------------------------------------------------------------
                               (INCLUDE ZIP CODE)
DAYTIME Area Code and Telephone No.: ___________________________________________
 
(Must  be signed by the registered holder(s) exactly as name(s) appear(s) on the
stock  certificate(s)  or  on  a  security  position  listing  or  by  person(s)
authorized   to  become  registered  holder(s)  by  certificates  and  documents
transmitted herewith. If  signature is  by a  trustee, executor,  administrator,
guardian, attorney-in-fact, officer of a corporation or other person acting in a
fiduciary  or  representative  capacity, please  set  forth full  title  and see
Instruction 5.)
<TABLE>
<S>                                               <C>
                                  DESCRIPTION OF SHARES TENDERED
  (IF TENDERING SHARES, PLEASE FILL IN EXACTLY AS INFORMATION APPEARS ON CERTIFICATE(S)) (ATTACH
                               ADDITIONAL SIGNED LIST IF NECESSARY)
                                                               TOTAL NUMBER OF SHARES
             CERTIFICATE NUMBER(S)*                        REPRESENTED BY CERTIFICATE(S)*
 
<CAPTION>
                                  DESCRIPTION OF
  (IF TENDERING SHARES, PLEASE FILL IN EXACTLY A
                               ADDITIONAL SIGNED
             CERTIFICATE NUMBER(S)*                         NUMBER OF SHARES TENDERED**
</TABLE>
 
 *Need not be completed by shareholders tendering by book-entry transfer.
<PAGE>
**Unless otherwise indicated, it will be assumed that all Shares represented by
  any certificates delivered to the Depositary are being tendered. See
  Instruction 4.
 
              GUARANTEE OF SIGNATURE(S) (SEE INSTRUCTIONS 1 AND 5)
Authorized Signature: __________________________________________________________
Name: __________________________________________________________________________
Name of Firm: __________________________________________________________________
Address of Firm: _______________________________________________________________
Area Code and Telephone No.: ___________________________________________________
Dated: ___________________________________________________________________, 1996
 
NOTE: IF SHARES ARE BEING TENDERED, THE REMAINDER OF THIS LETTER OF  TRANSMITTAL
      AND PROXY MUST BE COMPLETED, INCLUDING, IF APPLICABLE, THE SUBSTITUTE FORM
      W-9 BELOW.
 
    DELIVERY OF THIS LETTER OF TRANSMITTAL AND PROXY TO AN ADDRESS OTHER THAN AS
SET  FORTH ABOVE  OR TRANSMISSION OF  INSTRUCTIONS VIA A  FACSIMILE NUMBER OTHER
THAN ONE LISTED ABOVE WILL NOT CONSTITUTE  A VALID DELIVERY. YOU MUST SIGN  THIS
LETTER OF TRANSMITTAL AND PROXY IN THE APPROPRIATE SPACE THEREFOR PROVIDED ABOVE
AND, IF YOU ARE TENDERING ANY SHARES, COMPLETE THE SUBSTITUTE FORM W-9 SET FORTH
BELOW  OR  A FORM  W-8,  AS APPLICABLE.  SEE  INSTRUCTION 8  AND  "IMPORTANT TAX
INFORMATION" BELOW.
 
    DO NOT SEND  ANY CERTIFICATES  TO SMITH BARNEY  INC., MORGAN  STANLEY &  CO.
INCORPORATED,  MACKENZIE PARTNERS, INC.,  CINERGY CORP. OR  THE CINCINNATI GAS &
ELECTRIC COMPANY.
 
    THE INSTRUCTIONS ACCOMPANYING THIS LETTER OF TRANSMITTAL AND PROXY SHOULD BE
READ CAREFULLY BEFORE THIS LETTER OF TRANSMITTAL AND PROXY IS COMPLETED.
 
    This Letter of Transmittal and Proxy is to  be used (a) if Shares are to  be
voted  but not tendered, or (b) if  certificates are to be forwarded herewith or
(c) if  delivery  of  tendered Shares  (as  defined  below) is  to  be  made  by
book-entry  transfer to the Depositary's account at The Depository Trust Company
("DTC")  or  Philadelphia   Depository  Trust   Company  ("PDTC")   (hereinafter
collectively  referred to as  the "Book-Entry Transfer  Facilities") pursuant to
the procedures set forth under the heading "Terms of the Offer -- Procedure  for
Tendering  Shares"  in the  Offer to  Purchase and  Proxy Statement  (as defined
below).
 
    Preferred Shareholders  who wish  to tender  Shares yet  who cannot  deliver
their  Shares and all other  documents required hereby to  the Depositary by the
Expiration Date (as defined in the  Offer to Purchase and Proxy Statement)  must
tender  their Shares  pursuant to  the guaranteed  delivery procedure  set forth
under the heading "Terms of the Offer -- Procedure for Tendering Shares" in  the
Offer  to Purchase and Proxy Statement. See Instruction 2. DELIVERY OF DOCUMENTS
TO CINERGY,  THE CINCINNATI  GAS &  ELECTRIC COMPANY  OR A  BOOK-ENTRY  TRANSFER
FACILITY DOES NOT CONSTITUTE A VALID DELIVERY.
 
              (BOXES BELOW FOR USE BY ELIGIBLE INSTITUTIONS ONLY)
 
<TABLE>
<S>        <C>
/ /        CHECK  HERE IF TENDERED SHARES ARE BEING DELIVERED BY BOOK-ENTRY TRANSFER TO THE DEPOSITARY'S ACCOUNT AT
           ONE OF THE BOOK-ENTRY TRANSFER FACILITIES AND COMPLETE THE FOLLOWING:
           Name of tendering institution
           Check applicable box:
           / / DTC / / PDTC
           Account No.
           Transaction Code No.
/ /        CHECK HERE IF TENDERED SHARES ARE BEING DELIVERED PURSUANT TO A NOTICE OF GUARANTEED DELIVERY AND  PROXY
           PREVIOUSLY SENT TO THE DEPOSITARY AND COMPLETE THE FOLLOWING:
</TABLE>
 
Name(s) of tendering shareholder(s) ____________________________________________
 
Date of execution of Notice of Guaranteed Delivery and Proxy ___________________
 
Name of institution that guaranteed delivery ___________________________________
 
If delivery is by book-entry transfer:
 
Name of tendering institution __________________________________________________
 
Account no. ________________________________________ at
/ / DTC  / / PDTC
 
Transaction Code No. ___________________________________________________________
 
                    NOTE: SIGNATURES MUST BE PROVIDED ABOVE.
              PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY.
 
Ladies and Gentlemen:
 
    The  abovesigned  hereby tenders  to Cinergy  Corp., a  Delaware corporation
("Cinergy"), the  shares in  the amount  set  forth in  the box  above  labelled
"Description of Shares Tendered" pursuant to Cinergy's offer to purchase any and
all of the outstanding shares of the series of cumulative preferred stock of The
Cincinnati  Gas  &  Electric Company,  an  Ohio corporation  and  direct utility
subsidiary of Cinergy ("CG&E"), shown on the first page hereof as to which  this
Letter  of Transmittal  and Proxy is  applicable (the "Shares")  at the purchase
price per Share shown on the first page hereof, net to the seller in cash,  upon
the  terms and subject to the conditions set  forth in the Offer to Purchase and
Proxy Statement,  dated  August 20,  1996  (the  "Offer to  Purchase  and  Proxy
Statement"),  receipt of  which is  hereby acknowledged,  and in  this Letter of
Transmittal and  Proxy (which  as to  the  Shares, together  with the  Offer  to
Purchase   and  Proxy  Statement,  constitutes  the  "Offer").  WHILE  PREFERRED
SHAREHOLDERS WHO WISH TO TENDER THEIR SHARES PURSUANT TO THE OFFER NEED NOT VOTE
IN   FAVOR   OF   THE   PROPOSED   AMENDMENT   TO   CG&E'S   AMENDED    ARTICLES
<PAGE>
OF INCORPORATION, AS SET FORTH IN THE OFFER TO PURCHASE AND PROXY STATEMENT (THE
"PROPOSED  AMENDMENT"),  THE OFFER  IS CONDITIONED  UPON THE  PROPOSED AMENDMENT
BEING APPROVED AND ADOPTED AT  THE SPECIAL MEETING (AS  DEFINED IN THE OFFER  TO
PURCHASE  AND PROXY STATEMENT). See "Proposed Amendment and Proxy Solicitation",
"Terms of the Offer -- Extension of Tender Period; Termination; Amendments"  and
"Terms of the Offer -- Certain Conditions of the Offer" in the Offer to Purchase
and Proxy Statement.
 
    Subject  to, and effective  upon, acceptance for payment  of and payment for
the Shares tendered  herewith in accordance  with the terms  and subject to  the
conditions  of the Offer  (including, if the  Offer is extended  or amended, the
terms and conditions of any such extension or amendment), the abovesigned hereby
sells, assigns and transfers to, or upon the order of, Cinergy all right,  title
and  interest in and to all the Shares that are being tendered hereby and hereby
constitutes and appoints The  Bank of New York  (the "Depositary") the true  and
lawful  agent  and  attorney-in-fact of  the  abovesigned with  respect  to such
Shares, with  full  power of  substitution  (such  power of  attorney  being  an
irrevocable  power coupled  with an interest),  to (a)  deliver certificates for
such Shares,  or  transfer  ownership  of  such  Shares  on  the  account  books
maintained  by any of the Book-Entry  Transfer Facilities, together, in any such
case, with all accompanying evidences of  transfer and authenticity, to or  upon
the  order of Cinergy, (b) present such  Shares for registration and transfer on
the books of CG&E and (c) receive all benefits and otherwise exercise all rights
of beneficial ownership of such Shares, all in accordance with the terms of  the
Offer.
 
    The abovesigned hereby represents and warrants that the abovesigned has full
power  and authority  to tender, sell,  assign and transfer  the Shares tendered
hereby and that, when  and to the  extent the same are  accepted for payment  by
Cinergy,  Cinergy will acquire good,  marketable and unencumbered title thereto,
free and clear  of all liens,  restrictions, charges, encumbrances,  conditional
sales  agreements or other obligations relating to the sale or transfer thereof,
and the same will not  be subject to any  adverse claims. The abovesigned  will,
upon  request,  execute  and  deliver any  additional  documents  deemed  by the
Depositary or  Cinergy  to be  necessary  or  desirable to  complete  the  sale,
assignment and transfer of the Shares tendered hereby.
 
    All  authority  herein conferred  or  agreed to  be  conferred shall  not be
affected by, and shall survive the  death or incapacity of the abovesigned,  and
any  obligations of the  abovesigned hereunder shall be  binding upon the heirs,
personal representatives, successors and assigns  of the abovesigned. Except  as
stated in the Offer, this tender is irrevocable.
 
    The  abovesigned understands that  tenders of Shares pursuant  to any one of
the procedures described under the heading "Terms of the Offer -- Procedure  for
Tendering  Shares"  in the  Offer to  Purchase  and Proxy  Statement and  in the
instructions hereto will  constitute the abovesigned's  acceptance of the  terms
and  conditions  of the  Offer, including  the abovesigned's  representation and
warranty that (a) the abovesigned  has a net long  position in the Shares  being
tendered  within  the meaning  of Rule  14e-4  promulgated under  the Securities
Exchange Act of 1934,  as amended, and  (b) the tender  of such Shares  complies
with Rule 14e-4. Cinergy's acceptance for payment of Shares tendered pursuant to
the  Offer  will  constitute a  binding  agreement between  the  abovesigned and
Cinergy upon the terms and subject to the conditions of the Offer.
 
    The abovesigned recognizes  that, under certain  circumstances set forth  in
the  Offer to Purchase and  Proxy Statement, Cinergy may  terminate or amend the
Offer or may not be required to  purchase any of the Shares tendered hereby.  In
either event, the abovesigned understands that certificate(s) for any Shares not
tendered or not purchased will be returned to the abovesigned.
 
    Unless  otherwise  indicated in  the box  below  under the  heading "Special
Payment Instructions", please  issue the  check for  the purchase  price of  any
Shares purchased, and/or return any Shares not tendered or not purchased, in the
name(s)  of the abovesigned (and,  in the case of  Shares tendered by book-entry
transfer,  by  credit  to  the  account  at  the  Book-Entry  Transfer  Facility
designated above). Unless otherwise indicated in the box below under the heading
"Special Delivery Instructions", please mail the check for the purchase price of
any  Shares purchased  and/or any  certificates for  Shares not  tendered or not
purchased (and accompanying documents, as appropriate) to the abovesigned at the
address shown  below  the  abovesigned  signature(s). In  the  event  that  both
"Special   Payment  Instructions"   and  "Special   Delivery  Instructions"  are
completed, please issue the check for the purchase price of any Shares purchased
and/or return any Shares not  tendered or not purchased  in the name(s) of,  and
mail  said check  and/or any  certificates to,  the person(s)  so indicated. The
abovesigned recognizes that Cinergy has no obligation, pursuant to the  "Special
Payment  Instructions", to transfer  any Shares from the  name of the registered
holder(s) thereof if Cinergy does  not accept for payment  any of the Shares  so
tendered.
 
<TABLE>
<S>                                                     <C>
             SPECIAL PAYMENT INSTRUCTIONS                           SPECIAL DELIVERY INSTRUCTIONS
            (SEE INSTRUCTIONS 4, 6 AND 7)                           (SEE INSTRUCTIONS 4, 6 AND 7)
 
    To be completed ONLY if the check for the purchase  To  be completed  ONLY if  the check  for the purchase
price of  Shares  purchased  and/or  certificates  for  price  of  Shares  purchased  and/or  certificates for
Shares not tendered or not purchased are to be  issued  Shares  not tendered or not purchased are to be mailed
in the name of someone other than the abovesigned.      to someone  other  than  the  abovesigned  or  to  the
                                                        abovesigned  at an address other than that shown below
                                                        the abovesigned's signature(s).
 
Issue  / / check and/or                                 Mail  / / check and/or
      / / certificate(s) to:                            / / certificate(s) to:
Name                                                    Name
                    (PLEASE PRINT)                                          (PLEASE PRINT)
 
Address                                                 Address
 
                     (INCLUDE ZIP CODE)                                   (INCLUDE ZIP CODE)
 
             (TAXPAYER IDENTIFICATION OR
               SOCIAL SECURITY NUMBER)
</TABLE>
 
<TABLE>
<S>        <C>
/ /        CHECK HERE IF ANY OF THE  CERTIFICATES REPRESENTING SHARES THAT YOU OWN  AND WISH TO TENDER HAVE BEEN  LOST,
           DESTROYED OR STOLEN. (SEE INSTRUCTION 12.)
           Number of Shares represented by lost, destroyed or stolen certificates:
</TABLE>
 
<PAGE>
                               SOLICITED TENDERS
                              (SEE INSTRUCTION 10)
 
    As provided in Instruction 10, Cinergy will pay to any Soliciting Dealer, as
defined  in Instruction 10, a  solicitation fee of $1.50  per Share (except that
for transactions  for beneficial  owners  equal to  or exceeding  5,000  Shares,
Cinergy will pay a solicitation fee of $1.25 per Share) for any Shares tendered,
accepted for payment and paid pursuant to the Offer. However, Soliciting Dealers
will not be entitled to a solicitation fee for Shares beneficially owned by such
Soliciting Dealer.
 
    The  undersigned represents that  the Soliciting Dealer  which solicited and
obtained this tender is:
 
Name of Firm: __________________________________________________________________
                                      (PLEASE PRINT)
 
Name of Individual Broker
or Financial Consultant: _______________________________________________________
 
Telephone Number of Broker
or Financial Consultant: _______________________________________________________
 
Identification Number (if known): ______________________________________________
 
Address: _______________________________________________________________________
                                   (INCLUDE ZIP CODE)
 
    The following to be completed ONLY if customer's Shares held in nominee name
are tendered.
 
<TABLE>
<S>                                                      <C>
NAME OF BENEFICIAL OWNER                                 NUMBER OF SHARES TENDERED
                                     (ATTACH ADDITIONAL LIST IF NECESSARY)
- -------------------------------------------------------  -------------------------------------------------------
- -------------------------------------------------------  -------------------------------------------------------
- -------------------------------------------------------  -------------------------------------------------------
</TABLE>
 
    The acceptance of compensation by  such Soliciting Dealer will constitute  a
representation  by it that (a) it  has complied with the applicable requirements
of the Securities Exchange Act of 1934, as amended, and the applicable rules and
regulations thereunder, in connection with such solicitation; (b) it is entitled
to such compensation for such solicitation under the terms and conditions of the
Offer to  Purchase;  (c)  in  soliciting  tenders of  Shares,  it  has  used  no
soliciting  materials other than those furnished by  Cinergy; and (d) if it is a
foreign broker or dealer not eligible for membership in the National Association
of Securities Dealers, Inc. (the "NASD"), it has agreed to conform to the NASD's
Rules of Fair Practice in making solicitations.
 
    The payment of compensation  to any Soliciting Dealer  is dependent on  such
Soliciting Dealer returning a Notice of Solicited Tenders to the Depositary.
 
                 (IF SHARES ARE BEING TENDERED, PLEASE COMPLETE
            SUBSTITUTE FORM W-9 BELOW OR A FORM W-8, AS APPLICABLE)
 
SIGN HERE: _____________________________________________________________________
<PAGE>
                                  INSTRUCTIONS
 
             FORMING PART OF THE TERMS AND CONDITIONS OF THE OFFER
 
    1.    GUARANTEE OF  SIGNATURES.   Except  as  otherwise provided  below, all
signatures on this Letter of Transmittal and Proxy must be guaranteed by a  firm
that  is a member of  a registered national securities  exchange or the National
Association of  Securities Dealers,  Inc.,  or by  a  commercial bank  or  trust
company  having  an office  or correspondent  in  the United  States which  is a
participant in an approved Signature  Guarantee Medallion Program (an  "Eligible
Institution").  Signatures on this  Letter of Transmittal and  Proxy need not be
guaranteed (a)  if  this  Letter of  Transmittal  and  Proxy is  signed  by  the
registered  holder(s) of the Shares (which  term, for purposes of this document,
shall include any participant in one of the Book-Entry Transfer Facilities whose
name appears on  a security position  listing as the  owner of Shares)  tendered
herewith  and such holder(s) has  not completed the box  above under the heading
"Special Payment  Instructions" or  the  box above  under the  heading  "Special
Delivery  Instructions" on  this Letter  of Transmittal  and Proxy,  (b) if such
Shares are tendered for the  account of an Eligible  Institution or (c) if  this
Letter  of Transmittal and Proxy is being  used solely for the purpose of voting
Shares which are not being tendered pursuant to the Offer. See Instruction 5.
 
    2.  DELIVERY OF LETTER OF TRANSMITTAL AND PROXY AND SHARES.  This Letter  of
Transmittal  and Proxy  is to be  used if  (a) certificates are  to be forwarded
herewith, (b) delivery of Shares is  to be made by book-entry transfer  pursuant
to  the procedures set forth under the  heading "Terms of the Offer -- Procedure
for Tendering Shares" in the Offer to Purchase and Proxy Statement or (c) Shares
are being voted in  connection with the Offer.  Certificates for all  physically
delivered   Shares,  or  a  confirmation  of  a  book-entry  transfer  into  the
Depositary's account at one of the Book-Entry Transfer Facilities of all  Shares
delivered  electronically, as  well as  a properly  completed and  duly executed
Letter of Transmittal and Proxy (or  facsimile thereof) and any other  documents
required  by  this Letter  of Transmittal  and  Proxy, must  be received  by the
Depositary at one of its addresses set forth on the front page of this Letter of
Transmittal and Proxy  on or prior  to the  Expiration Date (as  defined in  the
Offer  to Purchase  and Proxy Statement)  with respect to  all Shares. Preferred
Shareholders who wish to tender their Shares yet who cannot deliver their Shares
and all other required documents to the Depositary on or prior to the Expiration
Date must tender their Shares pursuant to the guaranteed delivery procedure  set
forth  under the heading "Terms of the  Offer -- Procedure for Tendering Shares"
in the Offer to  Purchase and Proxy Statement.  Pursuant to such procedure:  (a)
such  tender must be made by or  through an Eligible Institution, (b) a properly
completed and duly executed Notice of Guaranteed Delivery and Proxy in the  form
provided by Cinergy (with any required signature guarantees) must be received by
the  Depositary  on or  prior  to the  applicable  Expiration Date  and  (c) the
certificates for  all  physically  delivered  Shares, or  a  confirmation  of  a
book-entry  transfer  into the  Depositary's account  at  one of  the Book-Entry
Transfer Facilities  of  all  Shares  delivered electronically,  as  well  as  a
properly  completed  and  duly  executed Letter  of  Transmittal  and  Proxy (or
facsimile  thereof)  and  any  other  documents  required  by  this  Letter   of
Transmittal  and Proxy must be received by the Depositary by 5:00 p.m. (New York
City time) within three New York Stock  Exchange trading days after the date  of
execution of such Notice of Guaranteed Delivery and Proxy, all as provided under
the  heading "Terms of the Offer -- Procedure for Tendering Shares" in the Offer
to Purchase and Proxy Statement.
 
    THE METHOD OF DELIVERY OF SHARES AND ALL OTHER REQUIRED DOCUMENTS IS AT  THE
OPTION  AND RISK  OF THE  TENDERING PREFERRED  SHAREHOLDER. IF  CERTIFICATES FOR
SHARES ARE SENT BY MAIL, REGISTERED MAIL WITH RETURN RECEIPT REQUESTED, PROPERLY
INSURED, IS RECOMMENDED.
 
    No alternative,  conditional or  contingent tenders  will be  accepted.  See
"Terms  of  the Offer  --  Number of  Shares;  Purchase Price;  Expiration Date;
Dividends" in  the Offer  to Purchase  and Proxy  Statement. By  executing  this
Letter   of  Transmittal  and  Proxy   (or  facsimile  thereof),  the  tendering
stockholder waives any right to receive any notice of the acceptance for payment
of the Shares.
 
    3.  VOTING.   WHILE PREFERRED SHAREHOLDERS WHO  WISH TO TENDER THEIR  SHARES
PURSUANT TO THE OFFER NEED NOT VOTE IN FAVOR OF THE PROPOSED AMENDMENT TO CG&E'S
AMENDED  ARTICLES OF INCORPORATION,  AS SET FORTH  IN THE OFFER  TO PURCHASE AND
PROXY STATEMENT (THE "PROPOSED  AMENDMENT"), THE OFFER  IS CONDITIONED UPON  THE
PROPOSED AMENDMENT BEING APPROVED AND ADOPTED AT THE SPECIAL MEETING (AS DEFINED
IN   THE  OFFER  TO  PURCHASE  AND  PROXY  STATEMENT).  In  addition,  Preferred
Shareholders have the  right to vote  for the proposed  amendment regardless  of
whether  they tender their Shares by casting  their vote and duly executing this
Letter of Transmittal and Proxy or by  voting in person at the Special  Meeting.
By  executing a Notice of Guaranteed Delivery and Proxy, a Preferred Shareholder
is taken to  have tendered  the Shares described  in such  Notice of  Guaranteed
Delivery  and Proxy and to  have voted such Shares  in accordance with the proxy
contained therein. If  no vote is  indicated on an  otherwise properly  executed
proxy  contained within this Letter of Transmittal and Proxy (or within a Notice
of Guaranteed Delivery and Proxy), then all Shares in respect of such proxy will
be voted in favor of the  Proposed Amendment. See "PROPOSED AMENDMENT AND  PROXY
SOLICITATION"  in the Offer to Purchase and  Proxy Statement. The Offer is being
sent to all persons in whose names Shares are registered on the books of CG&E on
the Record Date (as defined in the Offer to Purchase and Proxy Statement) and on
August 15, 1996. Only a record holder of  Shares on the Record Date may vote  in
person  or by proxy at the Special Meeting  (as defined in the Offer to Purchase
and Proxy Statement). No record date is fixed for determining which persons  are
permitted  to tender Shares. Any person who  is the beneficial owner but not the
record holder of  Shares must  arrange for the  record transfer  of such  Shares
prior to tendering.
 
    4.  PARTIAL TENDERS (NOT APPLICABLE TO SHAREHOLDERS WHO TENDER BY BOOK-ENTRY
TRANSFER).    If  fewer  than  all the  Shares  represented  by  any certificate
delivered to the Depositary  are to be  tendered, fill in  the number of  Shares
that  are to  be tendered  in the  box above  under the  heading "Description of
Shares Tendered".  In such  case, a  new certificate  for the  remainder of  the
Shares  represented by the old certificate will be sent to the person(s) signing
this Letter of Transmittal and Proxy, unless otherwise provided in the box above
under the
<PAGE>
heading "Special Payment  Instructions" or "Special  Delivery Instructions",  as
promptly  as practicable following  the expiration or  termination of the Offer.
All Shares  represented by  certificates  delivered to  the Depositary  will  be
deemed to have been tendered unless otherwise indicated.
 
    5.    SIGNATURES  ON  LETTER  OF  TRANSMITTAL  AND  PROXY  AND/OR  NOTICE OF
GUARANTEED DELIVERY AND PROXY;  STOCK POWERS AND ENDORSEMENTS.   If either  this
Letter  of Transmittal and Proxy or the  Notice of Guaranteed Delivery and Proxy
(together, the  "Tender  and  Proxy  Documents") is  signed  by  the  registered
holder(s)  of the Shares tendered hereby,  the signature(s) must correspond with
the name(s)  as written  on the  face of  the certificates  without  alteration,
enlargement or any change whatsoever.
 
    If  any  of the  Shares  tendered or  voted  under either  Tender  and Proxy
Document is held of record  by two or more persons,  all such persons must  sign
such Tender and Proxy Document.
 
    If  any  of the  Shares  tendered or  voted  under either  Tender  and Proxy
Document is registered in different names or different certificates, it will  be
necessary  to complete, sign  and submit as many  separate applicable Tender and
Proxy Documents as there are different registrations of certificates.
 
    If either Tender and Proxy Document is signed by the registered holder(s) of
the Shares tendered hereby,  no endorsements of  certificates or separate  stock
powers  are required unless payment  of the purchase price is  to be made to, or
Shares not tendered or not  purchased are to be registered  in the name of,  any
person  other than the registered holder(s). Signatures on any such certificates
or stock powers must be guaranteed  by an Eligible Institution. See  Instruction
1.
 
    If this Letter of Transmittal and Proxy is signed by a person other than the
registered  holder(s)  of  the  Shares  tendered  hereby,  certificates  must be
endorsed or  accompanied by  appropriate stock  powers, in  either case,  signed
exactly as the name(s) of the registered holder(s) appear(s) on the certificates
for  such Shares. Signature(s) on any such  certificates or stock powers must be
guaranteed by an Eligible Institution. See Instruction 1.
 
    If either Tender  and Proxy Document  or any certificate  or stock power  is
signed  by  a  trustee,  executor,  administrator,  guardian,  attorney-in-fact,
officer of a corporation or other person acting in a fiduciary or representative
capacity, such  person should  so  indicate when  signing, and  proper  evidence
satisfactory  to  Cinergy of  the authority  of such  person so  to act  must be
submitted.
 
    6.   STOCK TRANSFER  TAXES.   Except as  set forth  in this  Instruction  6,
Cinergy  will pay or cause  to be paid any stock  transfer taxes with respect to
the sale and transfer of  any Shares to it or  its order pursuant to the  Offer.
If,  however, payment  of the  purchase price is  to be  made to,  or Shares not
tendered or not purchased are to be registered in the name of, any person  other
than  the registered holder(s), or if tendered Shares are registered in the name
of any person other  than the person(s) signing  this Letter of Transmittal  and
Proxy, the amount of any stock transfer taxes (whether imposed on the registered
holder(s), such other person or otherwise) payable on account of the transfer to
such  person  will  be  deducted from  the  purchase  price  unless satisfactory
evidence of the payment of such taxes, or exemption therefrom, is submitted. See
"Terms of the Offer -- Acceptance of Shares for Payment and Payment of  Purchase
Price  and Dividend"  in the  Offer to Purchase  and Proxy  Statement. EXCEPT AS
PROVIDED IN THIS INSTRUCTION 6, IT WILL  NOT BE NECESSARY TO AFFIX TRANSFER  TAX
STAMPS TO THE CERTIFICATES REPRESENTING SHARES TENDERED HEREBY.
 
    7.    SPECIAL PAYMENT  AND  DELIVERY INSTRUCTIONS.    If the  check  for the
purchase price of any Shares  purchased is to be issued  in the name of,  and/or
any  Shares not tendered or not purchased are  to be returned to, a person other
than the person(s) signing this Letter of Transmittal and Proxy or if the  check
and/or any certificate for Shares not tendered or not purchased are to be mailed
to someone other than the person(s) signing this Letter of Transmittal and Proxy
or  to an  address other  than that  shown in  the box  above under  the heading
"Name(s) and Address(es)  of Registered  Holder(s)", then  the "Special  Payment
Instructions"   and/or  "Special  Delivery  Instructions"   on  this  Letter  of
Transmittal and  Proxy should  be  completed. Preferred  Shareholders  tendering
Shares  by book-entry  transfer will  have any  Shares not  accepted for payment
returned by crediting the  account maintained by  such Preferred Shareholder  at
the Book-Entry Transfer Facility from which such transfer was made.
 
    8.   SUBSTITUTE FORM W-9 AND FORM  W-8.  The tendering Preferred Shareholder
is  required  to  provide  the   Depositary  with  either  a  correct   Taxpayer
Identification  Number ("TIN") on  Substitute Form W-9,  which is provided under
"Important Tax Information" below, or a properly completed Form W-8. Failure  to
provide  the information on either  Substitute Form W-9 or  Form W-8 may subject
the tendering Preferred Shareholder to 31% federal income tax backup withholding
on the payment  of the  purchase price  for the  Shares. The  box in  Part 2  of
Substitute  Form W-9 may  be checked if the  tendering Preferred Shareholder has
not been issued a  TIN and has applied  for a number or  intends to apply for  a
number in the near future. If the box in Part 2 is checked and the Depositary is
not provided with a TIN by the time of payment, the Depositary will withhold 31%
on  all payments of the purchase price for  the Shares thereafter until a TIN is
provided to the Depositary.
 
    9.  REQUESTS FOR ASSISTANCE OR ADDITIONAL COPIES.  Any questions or requests
for assistance may be directed to  the Information Agent or the Dealer  Managers
at  their respective telephone numbers and  addresses listed below. Requests for
additional copies of the Offer to  Purchase and Proxy Statement, this Letter  of
Transmittal  and Proxy or  other tender offer  materials may be  directed to the
Information Agent  or the  Dealer Managers  and such  copies will  be  furnished
promptly  at Cinergy's  expense. Preferred  Shareholders may  also contact their
local broker, dealer, commercial bank or trust company for assistance concerning
the Offer.
 
    10.  SOLICITED TENDERS.   Cinergy will pay a  solicitation fee of $1.50  per
Share  (except that for transactions for beneficial owners equal to or exceeding
5,000 Shares, Cinergy will pay  a solicitation fee of  $1.25 per Share) for  any
Shares tendered, accepted for payment and paid pursuant to the Offer, covered by
the  Letter  of  Transmittal  and  Proxy  which  designates,  under  the heading
"Solicited Tenders", as having  solicited and obtained the  tender, the name  of
<PAGE>
(a)  any  broker or  dealer in  securities,  including a  Dealer Manager  in its
capacity as a dealer  or broker, which  is a member  of any national  securities
exchange  or  of  the  National Association  of  Securities  Dealers,  Inc. (the
"NASD"), (b) any  foreign broker or  dealer not eligible  for membership in  the
NASD  which agrees to conform to the NASD's Rules of Fair Practice in soliciting
tenders outside the United States to the  same extent as though it were an  NASD
member, or (c) any bank or trust company (each of which is referred to herein as
a "Soliciting Dealer"). No such fee shall be payable to a Soliciting Dealer with
respect to the tender of Shares by a holder unless the Letter of Transmittal and
Proxy  accompanying such tender  designates such Soliciting  Dealer. No such fee
shall be payable to a Soliciting Dealer  in respect of Shares registered in  the
name  of such Soliciting Dealer  unless such Shares are  held by such Soliciting
Dealer as nominee and such Shares are  being tendered for the benefit of one  or
more  beneficial owners identified on the Letter  of Transmittal and Proxy or on
the Notice of Solicited Tenders (included  in the materials provided to  brokers
and  dealers). No such fee shall be  payable to a Soliciting Dealer with respect
to the  tender of  Shares  by the  holder  of record,  for  the benefit  of  the
beneficial  owner, unless  the beneficial  owner has  designated such Soliciting
Dealer. If  tendered Shares  are  being delivered  by book-entry  transfer,  the
Soliciting  Dealer must return  a Notice of Solicited  Tenders to the Depositary
within  three  business  days  after  expiration  of  the  Offer  to  receive  a
solicitation  fee. No such fee  shall be payable to  a Soliciting Dealer if such
Soliciting Dealer is required for any reason to transfer the amount of such  fee
to  a depositing  holder (other  than itself). No  such fee  shall be  paid to a
Soliciting Dealer with respect to  Shares tendered for such Soliciting  Dealer's
own account. No broker, dealer, bank, trust company or fiduciary shall be deemed
to  be the agent of Cinergy, the Depositary, the Information Agent or the Dealer
Managers for purposes of the Offer.
 
    11.  IRREGULARITIES.   All questions  as to  the form of  documents and  the
validity,  eligibility (including time of receipt)  and acceptance of any tender
of Shares  will  be determined  by  Cinergy, in  its  sole discretion,  and  its
determination shall be final and binding. Cinergy reserves the absolute right to
reject  any and all tenders of Shares that  it determines are not in proper form
or the acceptance for payment of or payment for Shares that may, in the  opinion
of  Cinergy's counsel, be unlawful. Cinergy  also reserves the absolute right to
waive any of the conditions  to the Offer or any  defect or irregularity in  any
tender of Shares and Cinergy's interpretation of the terms and conditions of the
Offer  (including these instructions) shall be final and binding. Unless waived,
any defects or irregularities  in connection with tenders  must be cured  within
such  time as Cinergy shall determine. None of Cinergy, the Dealer Managers, the
Depositary, the Information Agent or any other person shall be under any duty to
give notice of any defect or irregularity in tenders nor shall any of them incur
any liability for failure to give any such notice. Tenders will not be deemed to
have been made until all defects and irregularities have been cured or waived.
 
    12.    LOST,  DESTROYED  OR   STOLEN  CERTIFICATES.    If  any   certificate
representing   Shares  has  been  lost,   destroyed  or  stolen,  the  Preferred
Shareholder  should  promptly  notify  the   Depositary  by  checking  the   box
immediately   following  the   Special  Payment   Instructions/Special  Delivery
Instructions and indicating the number of Shares lost, destroyed or stolen.  The
Preferred  Shareholder will then be instructed as to the procedures that must be
taken in order to replace the certificate. The tender of Shares pursuant to this
Letter of Transmittal and Proxy will not be valid unless prior to the Expiration
Date (as  defined  in the  Offer  to Purchase  and  Proxy Statement):  (a)  such
procedures  have been completed and a replacement certificate for the Shares has
been delivered to  the Depositary  or (b) a  Notice of  Guaranteed Delivery  and
Proxy has been delivered to the Depositary. See Instruction 2.
 
    IMPORTANT:  THIS  LETTER  OF  TRANSMITTAL AND  PROXY  (OR  A  FACSIMILE COPY
HEREOF),  DULY  EXECUTED,   TOGETHER  WITH,  IF   APPLICABLE,  CERTIFICATES   OR
CONFIRMATION  OF BOOK-ENTRY TRANSFER,  AND ALL OTHER  REQUIRED DOCUMENTS MUST BE
RECEIVED BY THE DEPOSITARY, OR, IF APPLICABLE, THE NOTICE OF GUARANTEED DELIVERY
AND PROXY MUST  BE RECEIVED BY  THE DEPOSITARY,  ON OR PRIOR  TO THE  APPLICABLE
EXPIRATION DATE (AS DEFINED IN THE OFFER TO PURCHASE AND PROXY STATEMENT).
 
                           IMPORTANT TAX INFORMATION
 
    Under  federal income tax law, a Preferred Shareholder whose tendered Shares
are accepted for payment is required  to provide the Depositary (as payer)  with
either  such Preferred Shareholder's correct TIN on Substitute Form W-9 below or
a properly completed Form W-8. If  such Preferred Shareholder is an  individual,
the TIN is his or her social security number. For businesses and other entities,
the  number is the federal employer  identification number. If the Depositary is
not provided with the correct TIN or properly completed Form W-8, the  Preferred
Shareholder  may be  subject to  a $50 penalty  imposed by  the Internal Revenue
Service. In addition, payments that are made to such Preferred Shareholder  with
respect  to Shares  purchased pursuant  to the  Offer may  be subject  to backup
withholding. The Form W-8 can be obtained from the Depositary. See the  enclosed
Guidelines  for Certification  of Taxpayer  Identification Number  on Substitute
Form W-9 for additional instructions.
 
    If federal income tax backup withholding applies, the Depositary is required
to withhold  31% of  any  payments made  to  the Preferred  Shareholder.  Backup
withholding  is not an additional tax.  Rather, the federal income tax liability
of persons subject to backup  withholding will be reduced  by the amount of  the
tax withheld. If withholding results in an overpayment of taxes, a refund may be
obtained.
 
PURPOSE OF SUBSTITUTE FORM W-9 AND FORM W-8
 
    To  avoid  backup  withholding on  payments  that  are made  to  a Preferred
Shareholder with  respect  to  Shares  purchased  pursuant  to  the  Offer,  the
Preferred Shareholder is required to notify the Depositary of his or her correct
TIN  by completing the  Substitute Form W-9 attached  hereto certifying that the
TIN provided  on Substitute  Form W-9  is  correct and  that (a)  the  Preferred
Shareholder has not been notified by the Internal Revenue Service that he or she
is  subject to federal income  tax backup withholding as  a result of failure to
report all  interest  or dividends  or  (b)  the Internal  Revenue  Service  has
notified  the  Preferred Shareholder  that he  or  she is  no longer  subject to
federal income tax
<PAGE>
backup withholding.  Foreign  Preferred  Shareholders  must  submit  a  properly
completed  Form  W-8  in  order  to  avoid  the  applicable  backup withholding;
provided, however, that backup withholding  will not apply to foreign  Preferred
Shareholders subject to 30% (or lower treaty rate) withholding on gross payments
received pursuant to the Offer.
 
WHAT NUMBER TO GIVE THE DEPOSITARY
 
    The  Preferred Shareholder  is required  to give  the Depositary  the social
security number or employer identification number of the registered owner of the
Shares. If the Shares are in  more than one name or are  not in the name of  the
actual  owner,  consult the  enclosed Guidelines  for Certification  of Taxpayer
Identification Number on Substitute  Form W-9 for  additional guidance on  which
number to report.
 
                       PAYER'S NAME: THE BANK OF NEW YORK
 
<TABLE>
<S>                               <C>                                  <C>
                                  Part 1 -- PLEASE PROVIDE YOUR TIN        Social Security Number OR
                                  IN THE BOX AT RIGHT AND CERTIFY BY    Employer Identification Number
                                  SIGNING AND DATING BELOW.                           TIN
                                  Name (Please Print)
                                  Address                              Part 2 --
SUBSTITUTE                        City State Zip Code                  Awaiting TIN  / /
                                  Part 3 -- CERTIFICATION -- UNDER THE PENALTIES OF PERJURY, I CERTIFY
                                  THAT: (1) the number shown on this form is my correct taxpayer
                                  identification number (or a TIN has not been issued to me but I have
                                  mailed or delivered an application to receive a TIN or intend to do so
                                  in the near future), (2) I am not subject to backup withholding either
                                  because I have not been notified by the Internal Revenue Service (the
                                  "IRS") that I am subject to backup withholding as a result of a
                                  failure to report all interest or dividends or the IRS has notified me
Form W-9                          that I am no longer subject to backup withholding and (3) all other
Department of the Treasury        information provided on this form is true, correct and complete.
Internal Revenue Service          SIGNATURE DATE, 1996
                                  You must cross out item (2) above if you have been notified by the IRS
                                  that you are currently subject to backup withholding because of
                                  underreporting interest or dividends on your tax return.
                                  NOTE: FAILURE TO COMPLETE AND RETURN THIS FORM MAY RESULT IN BACKUP
                                  WITHHOLDING OF 31% OF ANY PAYMENTS MADE TO YOU PURSUANT TO THE OFFER.
                                  PLEASE REVIEW THE ENCLOSED GUIDELINES FOR CERTIFICATION OF TAXPAYER
PAYER'S REQUEST FOR TAXPAYER      IDENTIFICATION NUMBER ON SUBSTITUTE FORM W-9 FOR ADDITIONAL DETAILS.
IDENTIFICATION NUMBER (TIN)       YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU CHECKED THE BOX IN
AND CERTIFICATION                 PART 2 OF SUBSTITUTE FORM W-9.
                                          CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER
                                  I certify under penalties of perjury that a taxpayer identification
                                  number has not been issued to me and either (1) I have mailed or
                                  delivered an application to receive a taxpayer identification number
                                  to the appropriate Internal Revenue Service Center or Social Security
                                  Administration Office or (2) I intend to do so in the near future. I
                                  understand that if I do not provide a taxpayer identification number
                                  by the time of payment, 31% of all payments of the purchase price made
                                  to me will be withheld until I provide a number.
                                  SIGNATURE DATE, 1996
</TABLE>
 
                              THE DEALER MANAGERS:
 
<TABLE>
<S>                                                 <C>
                SMITH BARNEY INC.                                  MORGAN STANLEY & CO.
               388 Greenwich Street                                    INCORPORATED
             New York, New York 10013                                 1585 Broadway
                  (800) 655-4811                                 New York, New York 10036
            Attention: Paul S. Galant                           (800) 223-2440, Ext. 1965
                                                                 Attention: Steve Sahara
</TABLE>
 
                             THE INFORMATION AGENT:
 
                                     [LOGO]
                                156 Fifth Avenue
                            New York, New York 10010
                         (212) 929-5500 (Call Collect)
                        Call Toll Free -- (800) 322-2885
<PAGE>
                        LETTER OF TRANSMITTAL AND PROXY
                                  TO ACCOMPANY
             SHARES OF 7 3/8% SERIES CUMULATIVE PREFERRED STOCK OF
 
                     THE CINCINNATI GAS & ELECTRIC COMPANY
 
              TENDERED PURSUANT TO THE OFFER TO PURCHASE FOR CASH
                                       BY
                                 CINERGY CORP.,
                    DATED AUGUST 20, 1996, FOR PURCHASE AT A
                      PURCHASE PRICE OF $110.00 PER SHARE
 
                                     AND/OR
 
                     VOTED PURSUANT TO THE PROXY STATEMENT
                                       OF
                     THE CINCINNATI GAS & ELECTRIC COMPANY
 
    THE  OFFER AND  WITHDRAWAL RIGHTS  WILL EXPIRE AT  5:00 P.M.,  NEW YORK CITY
TIME, ON WEDNESDAY, SEPTEMBER 18, 1996, UNLESS THE OFFER IS EXTENDED.
 
    THE PROXY CONTAINED IN THIS DOCUMENT IS IN RESPECT OF THE SPECIAL MEETING OF
SHAREHOLDERS TO BE  HELD ON SEPTEMBER  18, 1996, OR  ON SUCH DATE  TO WHICH  THE
MEETING IS ADJOURNED OR POSTPONED.
 
                      TO: THE BANK OF NEW YORK, DEPOSITARY
 
<TABLE>
<S>                                                      <C>
                       BY MAIL:                                       BY HAND OR OVERNIGHT COURIER:
             Tender & Exchange Department                             Tender & Exchange Department
                    P.O. Box 11248                                         101 Barclay Street
                 Church Street Station                                 Receive and Deliver Window
             New York, New York 10286-1248                              New York, New York 10286
</TABLE>
 
                           BY FACSIMILE TRANSMISSION:
 
                                 (212) 815-6213
 
                     INFORMATION AND CONFIRM BY TELEPHONE:
 
                                 (800) 507-9357
 
    CINERGY  WILL NOT BE  REQUIRED TO ACCEPT  FOR PAYMENT OR  PAY FOR ANY SHARES
TENDERED IF THE PROPOSED  AMENDMENT IS NOT APPROVED  AND ADOPTED AT THE  SPECIAL
MEETING.  PREFERRED  SHAREHOLDERS  HAVE  THE  RIGHT  TO  VOTE  FOR  THE PROPOSED
AMENDMENT REGARDLESS OF WHETHER THEY TENDER  THEIR SHARES BY CASTING THEIR  VOTE
AND  SIGNING THE PROXY CONTAINED WITHIN THIS  LETTER OF TRANSMITTAL AND PROXY OR
BY VOTING  IN  PERSON AT  THE  SPECIAL MEETING.  IF  THE PROPOSED  AMENDMENT  IS
APPROVED  AND ADOPTED, CG&E WILL  MAKE A SPECIAL CASH  PAYMENT TO EACH PREFERRED
SHAREHOLDER WHO VOTED IN  FAVOR OF THE PROPOSED  AMENDMENT, PROVIDED THAT  THEIR
SHARES ARE NOT TENDERED PURSUANT TO THE OFFER.
 
    NOTE:  SIGNATURES  MUST  BE  PROVIDED BELOW.  PLEASE  READ  THE ACCOMPANYING
INSTRUCTIONS CAREFULLY.
 
    The undersigned hereby appoints  Jackson H. Randolph,  James E. Rogers,  and
William  J. Grealis, or any of them, as  proxies, each with the power to appoint
his substitute,  and  hereby  authorizes  them  to  represent  and  to  vote  as
designated  hereunder and in their discretion with respect to any other business
properly brought  before  the Special  Meeting,  all the  shares  of  cumulative
preferred  stock of  The Cincinnati  Gas &  Electric Company  ("CG&E") which the
undersigned is entitled  to vote at  the Special Meeting  of Shareholders to  be
held on September 18, 1996, or any adjournment(s) or postponement(s) thereof.
 
    NOTE:  IF YOU  ARE VOTING BUT  NOT TENDERING  SHARES, DO NOT  SEND ANY SHARE
CERTIFICATES WITH THIS LETTER OF TRANSMITTAL AND PROXY.
 
    THIS LETTER OF TRANSMITTAL AND PROXY IS SOLICITED ON BEHALF OF THE BOARD  OF
DIRECTORS  OF CG&E. The proxy contained  herein, when properly executed, will be
voted in the  manner directed herein  by the undersigned  shareholder(s). If  no
direction is made, the proxy will be voted FOR Item 1.
 
    Indicate  your vote by an (X). The  Board of Directors recommends voting FOR
Item 1.
<PAGE>
ITEM 1.
 
    To remove from the Amended Articles of Incorporation Article Fourth,  Clause
6-A(b)  in  its  entirety,  which  limits  CG&E's  ability  to  issue  unsecured
indebtedness.
 
             / / FOR             / / AGAINST             / / ABSTAIN
 
                NAME(S) AND ADDRESS(ES) OF REGISTERED HOLDER(S)
 
    SHARES REPRESENTED  BY  ALL  PROPERLY  EXECUTED PROXIES  WILL  BE  VOTED  IN
ACCORDANCE WITH INSTRUCTIONS APPEARING ON THIS PROXY. IN THE ABSENCE OF SPECIFIC
INSTRUCTIONS,  PROXIES WILL BE  VOTED IN ACCORDANCE  WITH THE RECOMMENDATIONS OF
THE BOARD OF DIRECTORS,  AND IN THE  DISCRETION OF THE PROXY  HOLDERS AS TO  ANY
OTHER MATTERS THAT MAY PROPERLY COME BEFORE THE SPECIAL MEETING.
 
Please check box if you plan to attend the Special Meeting. / /
 
                            SIGNATURE(S) OF OWNER(S)
 
X
- --------------------------------------------------------------------------------
X
- --------------------------------------------------------------------------------
Dated: ___________________________________________________________________, 1996
Name(s): _______________________________________________________________________
 
- --------------------------------------------------------------------------------
                                 (PLEASE PRINT)
Capacity (full title): _________________________________________________________
Address: _______________________________________________________________________
 
- --------------------------------------------------------------------------------
                               (INCLUDE ZIP CODE)
DAYTIME Area Code and Telephone No.: ___________________________________________
 
(Must  be signed by the registered holder(s) exactly as name(s) appear(s) on the
stock  certificate(s)  or  on  a  security  position  listing  or  by  person(s)
authorized   to  become  registered  holder(s)  by  certificates  and  documents
transmitted herewith. If  signature is  by a  trustee, executor,  administrator,
guardian, attorney-in-fact, officer of a corporation or other person acting in a
fiduciary  or  representative  capacity, please  set  forth full  title  and see
Instruction 5.)
<TABLE>
<S>                                               <C>
                                  DESCRIPTION OF SHARES TENDERED
  (IF TENDERING SHARES, PLEASE FILL IN EXACTLY AS INFORMATION APPEARS ON CERTIFICATE(S)) (ATTACH
                               ADDITIONAL SIGNED LIST IF NECESSARY)
                                                               TOTAL NUMBER OF SHARES
             CERTIFICATE NUMBER(S)*                        REPRESENTED BY CERTIFICATE(S)*
 
<CAPTION>
                                  DESCRIPTION OF
  (IF TENDERING SHARES, PLEASE FILL IN EXACTLY A
                               ADDITIONAL SIGNED
             CERTIFICATE NUMBER(S)*                         NUMBER OF SHARES TENDERED**
</TABLE>
 
 *Need not be completed by shareholders tendering by book-entry transfer.
<PAGE>
**Unless otherwise indicated, it will be assumed that all Shares represented by
  any certificates delivered to the Depositary are being tendered. See
  Instruction 4.
 
              GUARANTEE OF SIGNATURE(S) (SEE INSTRUCTIONS 1 AND 5)
Authorized Signature: __________________________________________________________
Name: __________________________________________________________________________
Name of Firm: __________________________________________________________________
Address of Firm: _______________________________________________________________
Area Code and Telephone No.: ___________________________________________________
Dated: ___________________________________________________________________, 1996
 
NOTE: IF SHARES ARE BEING TENDERED, THE REMAINDER OF THIS LETTER OF  TRANSMITTAL
      AND PROXY MUST BE COMPLETED, INCLUDING, IF APPLICABLE, THE SUBSTITUTE FORM
      W-9 BELOW.
 
    DELIVERY OF THIS LETTER OF TRANSMITTAL AND PROXY TO AN ADDRESS OTHER THAN AS
SET  FORTH ABOVE  OR TRANSMISSION OF  INSTRUCTIONS VIA A  FACSIMILE NUMBER OTHER
THAN ONE LISTED ABOVE WILL NOT CONSTITUTE  A VALID DELIVERY. YOU MUST SIGN  THIS
LETTER OF TRANSMITTAL AND PROXY IN THE APPROPRIATE SPACE THEREFOR PROVIDED ABOVE
AND, IF YOU ARE TENDERING ANY SHARES, COMPLETE THE SUBSTITUTE FORM W-9 SET FORTH
BELOW  OR  A FORM  W-8,  AS APPLICABLE.  SEE  INSTRUCTION 8  AND  "IMPORTANT TAX
INFORMATION" BELOW.
 
    DO NOT SEND  ANY CERTIFICATES  TO SMITH BARNEY  INC., MORGAN  STANLEY &  CO.
INCORPORATED,  MACKENZIE PARTNERS, INC.,  CINERGY CORP. OR  THE CINCINNATI GAS &
ELECTRIC COMPANY.
 
    THE INSTRUCTIONS ACCOMPANYING THIS LETTER OF TRANSMITTAL AND PROXY SHOULD BE
READ CAREFULLY BEFORE THIS LETTER OF TRANSMITTAL AND PROXY IS COMPLETED.
 
    This Letter of Transmittal and Proxy is to  be used (a) if Shares are to  be
voted  but not tendered, or (b) if  certificates are to be forwarded herewith or
(c) if  delivery  of  tendered Shares  (as  defined  below) is  to  be  made  by
book-entry  transfer to the Depositary's account at The Depository Trust Company
("DTC")  or  Philadelphia   Depository  Trust   Company  ("PDTC")   (hereinafter
collectively  referred to as  the "Book-Entry Transfer  Facilities") pursuant to
the procedures set forth under the heading "Terms of the Offer -- Procedure  for
Tendering  Shares"  in the  Offer to  Purchase and  Proxy Statement  (as defined
below).
 
    Preferred Shareholders  who wish  to tender  Shares yet  who cannot  deliver
their  Shares and all other  documents required hereby to  the Depositary by the
Expiration Date (as defined in the  Offer to Purchase and Proxy Statement)  must
tender  their Shares  pursuant to  the guaranteed  delivery procedure  set forth
under the heading "Terms of the Offer -- Procedure for Tendering Shares" in  the
Offer  to Purchase and Proxy Statement. See Instruction 2. DELIVERY OF DOCUMENTS
TO CINERGY,  THE CINCINNATI  GAS &  ELECTRIC COMPANY  OR A  BOOK-ENTRY  TRANSFER
FACILITY DOES NOT CONSTITUTE A VALID DELIVERY.
 
              (BOXES BELOW FOR USE BY ELIGIBLE INSTITUTIONS ONLY)
 
<TABLE>
<S>        <C>
/ /        CHECK  HERE IF TENDERED SHARES ARE BEING DELIVERED BY BOOK-ENTRY TRANSFER TO THE DEPOSITARY'S ACCOUNT AT
           ONE OF THE BOOK-ENTRY TRANSFER FACILITIES AND COMPLETE THE FOLLOWING:
           Name of tendering institution
           Check applicable box:
           / / DTC / / PDTC
           Account No.
           Transaction Code No.
/ /        CHECK HERE IF TENDERED SHARES ARE BEING DELIVERED PURSUANT TO A NOTICE OF GUARANTEED DELIVERY AND  PROXY
           PREVIOUSLY SENT TO THE DEPOSITARY AND COMPLETE THE FOLLOWING:
</TABLE>
 
Name(s) of tendering shareholder(s) ____________________________________________
 
Date of execution of Notice of Guaranteed Delivery and Proxy ___________________
 
Name of institution that guaranteed delivery ___________________________________
 
If delivery is by book-entry transfer:
 
Name of tendering institution __________________________________________________
 
Account no. ________________________________________ at
/ / DTC  / / PDTC
 
Transaction Code No. ___________________________________________________________
 
                    NOTE: SIGNATURES MUST BE PROVIDED ABOVE.
              PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY.
 
Ladies and Gentlemen:
 
    The  abovesigned  hereby tenders  to Cinergy  Corp., a  Delaware corporation
("Cinergy"), the  shares in  the amount  set  forth in  the box  above  labelled
"Description of Shares Tendered" pursuant to Cinergy's offer to purchase any and
all of the outstanding shares of the series of cumulative preferred stock of The
Cincinnati  Gas  &  Electric Company,  an  Ohio corporation  and  direct utility
subsidiary of Cinergy ("CG&E"), shown on the first page hereof as to which  this
Letter  of Transmittal  and Proxy is  applicable (the "Shares")  at the purchase
price per Share shown on the first page hereof, net to the seller in cash,  upon
the  terms and subject to the conditions set  forth in the Offer to Purchase and
Proxy Statement,  dated  August 20,  1996  (the  "Offer to  Purchase  and  Proxy
Statement"),  receipt of  which is  hereby acknowledged,  and in  this Letter of
Transmittal and  Proxy (which  as to  the  Shares, together  with the  Offer  to
Purchase   and  Proxy  Statement,  constitutes  the  "Offer").  WHILE  PREFERRED
SHAREHOLDERS WHO WISH TO TENDER THEIR SHARES PURSUANT TO THE OFFER NEED NOT VOTE
IN   FAVOR   OF   THE   PROPOSED   AMENDMENT   TO   CG&E'S   AMENDED    ARTICLES
<PAGE>
OF INCORPORATION, AS SET FORTH IN THE OFFER TO PURCHASE AND PROXY STATEMENT (THE
"PROPOSED  AMENDMENT"),  THE OFFER  IS CONDITIONED  UPON THE  PROPOSED AMENDMENT
BEING APPROVED AND ADOPTED AT  THE SPECIAL MEETING (AS  DEFINED IN THE OFFER  TO
PURCHASE  AND PROXY STATEMENT). See "Proposed Amendment and Proxy Solicitation",
"Terms of the Offer -- Extension of Tender Period; Termination; Amendments"  and
"Terms of the Offer -- Certain Conditions of the Offer" in the Offer to Purchase
and Proxy Statement.
 
    Subject  to, and effective  upon, acceptance for payment  of and payment for
the Shares tendered  herewith in accordance  with the terms  and subject to  the
conditions  of the Offer  (including, if the  Offer is extended  or amended, the
terms and conditions of any such extension or amendment), the abovesigned hereby
sells, assigns and transfers to, or upon the order of, Cinergy all right,  title
and  interest in and to all the Shares that are being tendered hereby and hereby
constitutes and appoints The  Bank of New York  (the "Depositary") the true  and
lawful  agent  and  attorney-in-fact of  the  abovesigned with  respect  to such
Shares, with  full  power of  substitution  (such  power of  attorney  being  an
irrevocable  power coupled  with an interest),  to (a)  deliver certificates for
such Shares,  or  transfer  ownership  of  such  Shares  on  the  account  books
maintained  by any of the Book-Entry  Transfer Facilities, together, in any such
case, with all accompanying evidences of  transfer and authenticity, to or  upon
the  order of Cinergy, (b) present such  Shares for registration and transfer on
the books of CG&E and (c) receive all benefits and otherwise exercise all rights
of beneficial ownership of such Shares, all in accordance with the terms of  the
Offer.
 
    The abovesigned hereby represents and warrants that the abovesigned has full
power  and authority  to tender, sell,  assign and transfer  the Shares tendered
hereby and that, when  and to the  extent the same are  accepted for payment  by
Cinergy,  Cinergy will acquire good,  marketable and unencumbered title thereto,
free and clear  of all liens,  restrictions, charges, encumbrances,  conditional
sales  agreements or other obligations relating to the sale or transfer thereof,
and the same will not  be subject to any  adverse claims. The abovesigned  will,
upon  request,  execute  and  deliver any  additional  documents  deemed  by the
Depositary or  Cinergy  to be  necessary  or  desirable to  complete  the  sale,
assignment and transfer of the Shares tendered hereby.
 
    All  authority  herein conferred  or  agreed to  be  conferred shall  not be
affected by, and shall survive the  death or incapacity of the abovesigned,  and
any  obligations of the  abovesigned hereunder shall be  binding upon the heirs,
personal representatives, successors and assigns  of the abovesigned. Except  as
stated in the Offer, this tender is irrevocable.
 
    The  abovesigned understands that  tenders of Shares pursuant  to any one of
the procedures described under the heading "Terms of the Offer -- Procedure  for
Tendering  Shares"  in the  Offer to  Purchase  and Proxy  Statement and  in the
instructions hereto will  constitute the abovesigned's  acceptance of the  terms
and  conditions  of the  Offer, including  the abovesigned's  representation and
warranty that (a) the abovesigned  has a net long  position in the Shares  being
tendered  within  the meaning  of Rule  14e-4  promulgated under  the Securities
Exchange Act of 1934,  as amended, and  (b) the tender  of such Shares  complies
with Rule 14e-4. Cinergy's acceptance for payment of Shares tendered pursuant to
the  Offer  will  constitute a  binding  agreement between  the  abovesigned and
Cinergy upon the terms and subject to the conditions of the Offer.
 
    The abovesigned recognizes  that, under certain  circumstances set forth  in
the  Offer to Purchase and  Proxy Statement, Cinergy may  terminate or amend the
Offer or may not be required to  purchase any of the Shares tendered hereby.  In
either event, the abovesigned understands that certificate(s) for any Shares not
tendered or not purchased will be returned to the abovesigned.
 
    Unless  otherwise  indicated in  the box  below  under the  heading "Special
Payment Instructions", please  issue the  check for  the purchase  price of  any
Shares purchased, and/or return any Shares not tendered or not purchased, in the
name(s)  of the abovesigned (and,  in the case of  Shares tendered by book-entry
transfer,  by  credit  to  the  account  at  the  Book-Entry  Transfer  Facility
designated above). Unless otherwise indicated in the box below under the heading
"Special Delivery Instructions", please mail the check for the purchase price of
any  Shares purchased  and/or any  certificates for  Shares not  tendered or not
purchased (and accompanying documents, as appropriate) to the abovesigned at the
address shown  below  the  abovesigned  signature(s). In  the  event  that  both
"Special   Payment  Instructions"   and  "Special   Delivery  Instructions"  are
completed, please issue the check for the purchase price of any Shares purchased
and/or return any Shares not  tendered or not purchased  in the name(s) of,  and
mail  said check  and/or any  certificates to,  the person(s)  so indicated. The
abovesigned recognizes that Cinergy has no obligation, pursuant to the  "Special
Payment  Instructions", to transfer  any Shares from the  name of the registered
holder(s) thereof if Cinergy does  not accept for payment  any of the Shares  so
tendered.
 
<TABLE>
<S>                                                     <C>
             SPECIAL PAYMENT INSTRUCTIONS                           SPECIAL DELIVERY INSTRUCTIONS
            (SEE INSTRUCTIONS 4, 6 AND 7)                           (SEE INSTRUCTIONS 4, 6 AND 7)
 
    To be completed ONLY if the check for the purchase  To  be completed  ONLY if  the check  for the purchase
price of  Shares  purchased  and/or  certificates  for  price  of  Shares  purchased  and/or  certificates for
Shares not tendered or not purchased are to be  issued  Shares  not tendered or not purchased are to be mailed
in the name of someone other than the abovesigned.      to someone  other  than  the  abovesigned  or  to  the
                                                        abovesigned  at an address other than that shown below
                                                        the abovesigned's signature(s).
 
Issue  / / check and/or                                 Mail  / / check and/or
      / / certificate(s) to:                            / / certificate(s) to:
Name                                                    Name
                    (PLEASE PRINT)                                          (PLEASE PRINT)
 
Address                                                 Address
 
                     (INCLUDE ZIP CODE)                                   (INCLUDE ZIP CODE)
 
             (TAXPAYER IDENTIFICATION OR
               SOCIAL SECURITY NUMBER)
</TABLE>
 
<TABLE>
<S>        <C>
/ /        CHECK HERE IF ANY OF THE  CERTIFICATES REPRESENTING SHARES THAT YOU OWN  AND WISH TO TENDER HAVE BEEN  LOST,
           DESTROYED OR STOLEN. (SEE INSTRUCTION 12.)
           Number of Shares represented by lost, destroyed or stolen certificates:
</TABLE>
 
<PAGE>
                               SOLICITED TENDERS
                              (SEE INSTRUCTION 10)
 
    As provided in Instruction 10, Cinergy will pay to any Soliciting Dealer, as
defined  in Instruction 10, a  solicitation fee of $1.50  per Share (except that
for transactions  for beneficial  owners  equal to  or exceeding  5,000  Shares,
Cinergy will pay a solicitation fee of $1.25 per Share) for any Shares tendered,
accepted for payment and paid pursuant to the Offer. However, Soliciting Dealers
will not be entitled to a solicitation fee for Shares beneficially owned by such
Soliciting Dealer.
 
    The  undersigned represents that  the Soliciting Dealer  which solicited and
obtained this tender is:
 
Name of Firm: __________________________________________________________________
                                      (PLEASE PRINT)
 
Name of Individual Broker
or Financial Consultant: _______________________________________________________
 
Telephone Number of Broker
or Financial Consultant: _______________________________________________________
 
Identification Number (if known): ______________________________________________
 
Address: _______________________________________________________________________
                                   (INCLUDE ZIP CODE)
 
    The following to be completed ONLY if customer's Shares held in nominee name
are tendered.
 
<TABLE>
<S>                                                      <C>
NAME OF BENEFICIAL OWNER                                 NUMBER OF SHARES TENDERED
                                     (ATTACH ADDITIONAL LIST IF NECESSARY)
- -------------------------------------------------------  -------------------------------------------------------
- -------------------------------------------------------  -------------------------------------------------------
- -------------------------------------------------------  -------------------------------------------------------
</TABLE>
 
    The acceptance of compensation by  such Soliciting Dealer will constitute  a
representation  by it that (a) it  has complied with the applicable requirements
of the Securities Exchange Act of 1934, as amended, and the applicable rules and
regulations thereunder, in connection with such solicitation; (b) it is entitled
to such compensation for such solicitation under the terms and conditions of the
Offer to  Purchase;  (c)  in  soliciting  tenders of  Shares,  it  has  used  no
soliciting  materials other than those furnished by  Cinergy; and (d) if it is a
foreign broker or dealer not eligible for membership in the National Association
of Securities Dealers, Inc. (the "NASD"), it has agreed to conform to the NASD's
Rules of Fair Practice in making solicitations.
 
    The payment of compensation  to any Soliciting Dealer  is dependent on  such
Soliciting Dealer returning a Notice of Solicited Tenders to the Depositary.
 
                 (IF SHARES ARE BEING TENDERED, PLEASE COMPLETE
            SUBSTITUTE FORM W-9 BELOW OR A FORM W-8, AS APPLICABLE)
 
SIGN HERE: _____________________________________________________________________
<PAGE>
                                  INSTRUCTIONS
 
             FORMING PART OF THE TERMS AND CONDITIONS OF THE OFFER
 
    1.    GUARANTEE OF  SIGNATURES.   Except  as  otherwise provided  below, all
signatures on this Letter of Transmittal and Proxy must be guaranteed by a  firm
that  is a member of  a registered national securities  exchange or the National
Association of  Securities Dealers,  Inc.,  or by  a  commercial bank  or  trust
company  having  an office  or correspondent  in  the United  States which  is a
participant in an approved Signature  Guarantee Medallion Program (an  "Eligible
Institution").  Signatures on this  Letter of Transmittal and  Proxy need not be
guaranteed (a)  if  this  Letter of  Transmittal  and  Proxy is  signed  by  the
registered  holder(s) of the Shares (which  term, for purposes of this document,
shall include any participant in one of the Book-Entry Transfer Facilities whose
name appears on  a security position  listing as the  owner of Shares)  tendered
herewith  and such holder(s) has  not completed the box  above under the heading
"Special Payment  Instructions" or  the  box above  under the  heading  "Special
Delivery  Instructions" on  this Letter  of Transmittal  and Proxy,  (b) if such
Shares are tendered for the  account of an Eligible  Institution or (c) if  this
Letter  of Transmittal and Proxy is being  used solely for the purpose of voting
Shares which are not being tendered pursuant to the Offer. See Instruction 5.
 
    2.  DELIVERY OF LETTER OF TRANSMITTAL AND PROXY AND SHARES.  This Letter  of
Transmittal  and Proxy  is to be  used if  (a) certificates are  to be forwarded
herewith, (b) delivery of Shares is  to be made by book-entry transfer  pursuant
to  the procedures set forth under the  heading "Terms of the Offer -- Procedure
for Tendering Shares" in the Offer to Purchase and Proxy Statement or (c) Shares
are being voted in  connection with the Offer.  Certificates for all  physically
delivered   Shares,  or  a  confirmation  of  a  book-entry  transfer  into  the
Depositary's account at one of the Book-Entry Transfer Facilities of all  Shares
delivered  electronically, as  well as  a properly  completed and  duly executed
Letter of Transmittal and Proxy (or  facsimile thereof) and any other  documents
required  by  this Letter  of Transmittal  and  Proxy, must  be received  by the
Depositary at one of its addresses set forth on the front page of this Letter of
Transmittal and Proxy  on or prior  to the  Expiration Date (as  defined in  the
Offer  to Purchase  and Proxy Statement)  with respect to  all Shares. Preferred
Shareholders who wish to tender their Shares yet who cannot deliver their Shares
and all other required documents to the Depositary on or prior to the Expiration
Date must tender their Shares pursuant to the guaranteed delivery procedure  set
forth  under the heading "Terms of the  Offer -- Procedure for Tendering Shares"
in the Offer to  Purchase and Proxy Statement.  Pursuant to such procedure:  (a)
such  tender must be made by or  through an Eligible Institution, (b) a properly
completed and duly executed Notice of Guaranteed Delivery and Proxy in the  form
provided by Cinergy (with any required signature guarantees) must be received by
the  Depositary  on or  prior  to the  applicable  Expiration Date  and  (c) the
certificates for  all  physically  delivered  Shares, or  a  confirmation  of  a
book-entry  transfer  into the  Depositary's account  at  one of  the Book-Entry
Transfer Facilities  of  all  Shares  delivered electronically,  as  well  as  a
properly  completed  and  duly  executed Letter  of  Transmittal  and  Proxy (or
facsimile  thereof)  and  any  other  documents  required  by  this  Letter   of
Transmittal  and Proxy must be received by the Depositary by 5:00 p.m. (New York
City time) within three New York Stock  Exchange trading days after the date  of
execution of such Notice of Guaranteed Delivery and Proxy, all as provided under
the  heading "Terms of the Offer -- Procedure for Tendering Shares" in the Offer
to Purchase and Proxy Statement.
 
    THE METHOD OF DELIVERY OF SHARES AND ALL OTHER REQUIRED DOCUMENTS IS AT  THE
OPTION  AND RISK  OF THE  TENDERING PREFERRED  SHAREHOLDER. IF  CERTIFICATES FOR
SHARES ARE SENT BY MAIL, REGISTERED MAIL WITH RETURN RECEIPT REQUESTED, PROPERLY
INSURED, IS RECOMMENDED.
 
    No alternative,  conditional or  contingent tenders  will be  accepted.  See
"Terms  of  the Offer  --  Number of  Shares;  Purchase Price;  Expiration Date;
Dividends" in  the Offer  to Purchase  and Proxy  Statement. By  executing  this
Letter   of  Transmittal  and  Proxy   (or  facsimile  thereof),  the  tendering
stockholder waives any right to receive any notice of the acceptance for payment
of the Shares.
 
    3.  VOTING.   WHILE PREFERRED SHAREHOLDERS WHO  WISH TO TENDER THEIR  SHARES
PURSUANT TO THE OFFER NEED NOT VOTE IN FAVOR OF THE PROPOSED AMENDMENT TO CG&E'S
AMENDED  ARTICLES OF INCORPORATION,  AS SET FORTH  IN THE OFFER  TO PURCHASE AND
PROXY STATEMENT (THE "PROPOSED  AMENDMENT"), THE OFFER  IS CONDITIONED UPON  THE
PROPOSED AMENDMENT BEING APPROVED AND ADOPTED AT THE SPECIAL MEETING (AS DEFINED
IN   THE  OFFER  TO  PURCHASE  AND  PROXY  STATEMENT).  In  addition,  Preferred
Shareholders have the  right to vote  for the proposed  amendment regardless  of
whether  they tender their Shares by casting  their vote and duly executing this
Letter of Transmittal and Proxy or by  voting in person at the Special  Meeting.
By  executing a Notice of Guaranteed Delivery and Proxy, a Preferred Shareholder
is taken to  have tendered  the Shares described  in such  Notice of  Guaranteed
Delivery  and Proxy and to  have voted such Shares  in accordance with the proxy
contained therein. If  no vote is  indicated on an  otherwise properly  executed
proxy  contained within this Letter of Transmittal and Proxy (or within a Notice
of Guaranteed Delivery and Proxy), then all Shares in respect of such proxy will
be voted in favor of the  Proposed Amendment. See "PROPOSED AMENDMENT AND  PROXY
SOLICITATION"  in the Offer to Purchase and  Proxy Statement. The Offer is being
sent to all persons in whose names Shares are registered on the books of CG&E on
the Record Date (as defined in the Offer to Purchase and Proxy Statement) and on
August 15, 1996. Only a record holder of  Shares on the Record Date may vote  in
person  or by proxy at the Special Meeting  (as defined in the Offer to Purchase
and Proxy Statement). No record date is fixed for determining which persons  are
permitted  to tender Shares. Any person who  is the beneficial owner but not the
record holder of  Shares must  arrange for the  record transfer  of such  Shares
prior to tendering.
 
    4.  PARTIAL TENDERS (NOT APPLICABLE TO SHAREHOLDERS WHO TENDER BY BOOK-ENTRY
TRANSFER).    If  fewer  than  all the  Shares  represented  by  any certificate
delivered to the Depositary  are to be  tendered, fill in  the number of  Shares
that  are to  be tendered  in the  box above  under the  heading "Description of
Shares Tendered".  In such  case, a  new certificate  for the  remainder of  the
Shares  represented by the old certificate will be sent to the person(s) signing
this Letter of Transmittal and Proxy, unless otherwise provided in the box above
under the
<PAGE>
heading "Special Payment  Instructions" or "Special  Delivery Instructions",  as
promptly  as practicable following  the expiration or  termination of the Offer.
All Shares  represented by  certificates  delivered to  the Depositary  will  be
deemed to have been tendered unless otherwise indicated.
 
    5.    SIGNATURES  ON  LETTER  OF  TRANSMITTAL  AND  PROXY  AND/OR  NOTICE OF
GUARANTEED DELIVERY AND PROXY;  STOCK POWERS AND ENDORSEMENTS.   If either  this
Letter  of Transmittal and Proxy or the  Notice of Guaranteed Delivery and Proxy
(together, the  "Tender  and  Proxy  Documents") is  signed  by  the  registered
holder(s)  of the Shares tendered hereby,  the signature(s) must correspond with
the name(s)  as written  on the  face of  the certificates  without  alteration,
enlargement or any change whatsoever.
 
    If  any  of the  Shares  tendered or  voted  under either  Tender  and Proxy
Document is held of record  by two or more persons,  all such persons must  sign
such Tender and Proxy Document.
 
    If  any  of the  Shares  tendered or  voted  under either  Tender  and Proxy
Document is registered in different names or different certificates, it will  be
necessary  to complete, sign  and submit as many  separate applicable Tender and
Proxy Documents as there are different registrations of certificates.
 
    If either Tender and Proxy Document is signed by the registered holder(s) of
the Shares tendered hereby,  no endorsements of  certificates or separate  stock
powers  are required unless payment  of the purchase price is  to be made to, or
Shares not tendered or not  purchased are to be registered  in the name of,  any
person  other than the registered holder(s). Signatures on any such certificates
or stock powers must be guaranteed  by an Eligible Institution. See  Instruction
1.
 
    If this Letter of Transmittal and Proxy is signed by a person other than the
registered  holder(s)  of  the  Shares  tendered  hereby,  certificates  must be
endorsed or  accompanied by  appropriate stock  powers, in  either case,  signed
exactly as the name(s) of the registered holder(s) appear(s) on the certificates
for  such Shares. Signature(s) on any such  certificates or stock powers must be
guaranteed by an Eligible Institution. See Instruction 1.
 
    If either Tender  and Proxy Document  or any certificate  or stock power  is
signed  by  a  trustee,  executor,  administrator,  guardian,  attorney-in-fact,
officer of a corporation or other person acting in a fiduciary or representative
capacity, such  person should  so  indicate when  signing, and  proper  evidence
satisfactory  to  Cinergy of  the authority  of such  person so  to act  must be
submitted.
 
    6.   STOCK TRANSFER  TAXES.   Except as  set forth  in this  Instruction  6,
Cinergy  will pay or cause  to be paid any stock  transfer taxes with respect to
the sale and transfer of  any Shares to it or  its order pursuant to the  Offer.
If,  however, payment  of the  purchase price is  to be  made to,  or Shares not
tendered or not purchased are to be registered in the name of, any person  other
than  the registered holder(s), or if tendered Shares are registered in the name
of any person other  than the person(s) signing  this Letter of Transmittal  and
Proxy, the amount of any stock transfer taxes (whether imposed on the registered
holder(s), such other person or otherwise) payable on account of the transfer to
such  person  will  be  deducted from  the  purchase  price  unless satisfactory
evidence of the payment of such taxes, or exemption therefrom, is submitted. See
"Terms of the Offer -- Acceptance of Shares for Payment and Payment of  Purchase
Price  and Dividend"  in the  Offer to Purchase  and Proxy  Statement. EXCEPT AS
PROVIDED IN THIS INSTRUCTION 6, IT WILL  NOT BE NECESSARY TO AFFIX TRANSFER  TAX
STAMPS TO THE CERTIFICATES REPRESENTING SHARES TENDERED HEREBY.
 
    7.    SPECIAL PAYMENT  AND  DELIVERY INSTRUCTIONS.    If the  check  for the
purchase price of any Shares  purchased is to be issued  in the name of,  and/or
any  Shares not tendered or not purchased are  to be returned to, a person other
than the person(s) signing this Letter of Transmittal and Proxy or if the  check
and/or any certificate for Shares not tendered or not purchased are to be mailed
to someone other than the person(s) signing this Letter of Transmittal and Proxy
or  to an  address other  than that  shown in  the box  above under  the heading
"Name(s) and Address(es)  of Registered  Holder(s)", then  the "Special  Payment
Instructions"   and/or  "Special  Delivery  Instructions"   on  this  Letter  of
Transmittal and  Proxy should  be  completed. Preferred  Shareholders  tendering
Shares  by book-entry  transfer will  have any  Shares not  accepted for payment
returned by crediting the  account maintained by  such Preferred Shareholder  at
the Book-Entry Transfer Facility from which such transfer was made.
 
    8.   SUBSTITUTE FORM W-9 AND FORM  W-8.  The tendering Preferred Shareholder
is  required  to  provide  the   Depositary  with  either  a  correct   Taxpayer
Identification  Number ("TIN") on  Substitute Form W-9,  which is provided under
"Important Tax Information" below, or a properly completed Form W-8. Failure  to
provide  the information on either  Substitute Form W-9 or  Form W-8 may subject
the tendering Preferred Shareholder to 31% federal income tax backup withholding
on the payment  of the  purchase price  for the  Shares. The  box in  Part 2  of
Substitute  Form W-9 may  be checked if the  tendering Preferred Shareholder has
not been issued a  TIN and has applied  for a number or  intends to apply for  a
number in the near future. If the box in Part 2 is checked and the Depositary is
not provided with a TIN by the time of payment, the Depositary will withhold 31%
on  all payments of the purchase price for  the Shares thereafter until a TIN is
provided to the Depositary.
 
    9.  REQUESTS FOR ASSISTANCE OR ADDITIONAL COPIES.  Any questions or requests
for assistance may be directed to  the Information Agent or the Dealer  Managers
at  their respective telephone numbers and  addresses listed below. Requests for
additional copies of the Offer to  Purchase and Proxy Statement, this Letter  of
Transmittal  and Proxy or  other tender offer  materials may be  directed to the
Information Agent  or the  Dealer Managers  and such  copies will  be  furnished
promptly  at Cinergy's  expense. Preferred  Shareholders may  also contact their
local broker, dealer, commercial bank or trust company for assistance concerning
the Offer.
 
    10.  SOLICITED TENDERS.   Cinergy will pay a  solicitation fee of $1.50  per
Share  (except that for transactions for beneficial owners equal to or exceeding
5,000 Shares, Cinergy will pay  a solicitation fee of  $1.25 per Share) for  any
Shares tendered, accepted for payment and paid pursuant to the Offer, covered by
the  Letter  of  Transmittal  and  Proxy  which  designates,  under  the heading
"Solicited Tenders", as having  solicited and obtained the  tender, the name  of
<PAGE>
(a)  any  broker or  dealer in  securities,  including a  Dealer Manager  in its
capacity as a dealer  or broker, which  is a member  of any national  securities
exchange  or  of  the  National Association  of  Securities  Dealers,  Inc. (the
"NASD"), (b) any  foreign broker or  dealer not eligible  for membership in  the
NASD  which agrees to conform to the NASD's Rules of Fair Practice in soliciting
tenders outside the United States to the  same extent as though it were an  NASD
member, or (c) any bank or trust company (each of which is referred to herein as
a "Soliciting Dealer"). No such fee shall be payable to a Soliciting Dealer with
respect to the tender of Shares by a holder unless the Letter of Transmittal and
Proxy  accompanying such tender  designates such Soliciting  Dealer. No such fee
shall be payable to a Soliciting Dealer  in respect of Shares registered in  the
name  of such Soliciting Dealer  unless such Shares are  held by such Soliciting
Dealer as nominee and such Shares are  being tendered for the benefit of one  or
more  beneficial owners identified on the Letter  of Transmittal and Proxy or on
the Notice of Solicited Tenders (included  in the materials provided to  brokers
and  dealers). No such fee shall be  payable to a Soliciting Dealer with respect
to the  tender of  Shares  by the  holder  of record,  for  the benefit  of  the
beneficial  owner, unless  the beneficial  owner has  designated such Soliciting
Dealer. If  tendered Shares  are  being delivered  by book-entry  transfer,  the
Soliciting  Dealer must return  a Notice of Solicited  Tenders to the Depositary
within  three  business  days  after  expiration  of  the  Offer  to  receive  a
solicitation  fee. No such fee  shall be payable to  a Soliciting Dealer if such
Soliciting Dealer is required for any reason to transfer the amount of such  fee
to  a depositing  holder (other  than itself). No  such fee  shall be  paid to a
Soliciting Dealer with respect to  Shares tendered for such Soliciting  Dealer's
own account. No broker, dealer, bank, trust company or fiduciary shall be deemed
to  be the agent of Cinergy, the Depositary, the Information Agent or the Dealer
Managers for purposes of the Offer.
 
    11.  IRREGULARITIES.   All questions  as to  the form of  documents and  the
validity,  eligibility (including time of receipt)  and acceptance of any tender
of Shares  will  be determined  by  Cinergy, in  its  sole discretion,  and  its
determination shall be final and binding. Cinergy reserves the absolute right to
reject  any and all tenders of Shares that  it determines are not in proper form
or the acceptance for payment of or payment for Shares that may, in the  opinion
of  Cinergy's counsel, be unlawful. Cinergy  also reserves the absolute right to
waive any of the conditions  to the Offer or any  defect or irregularity in  any
tender of Shares and Cinergy's interpretation of the terms and conditions of the
Offer  (including these instructions) shall be final and binding. Unless waived,
any defects or irregularities  in connection with tenders  must be cured  within
such  time as Cinergy shall determine. None of Cinergy, the Dealer Managers, the
Depositary, the Information Agent or any other person shall be under any duty to
give notice of any defect or irregularity in tenders nor shall any of them incur
any liability for failure to give any such notice. Tenders will not be deemed to
have been made until all defects and irregularities have been cured or waived.
 
    12.    LOST,  DESTROYED  OR   STOLEN  CERTIFICATES.    If  any   certificate
representing   Shares  has  been  lost,   destroyed  or  stolen,  the  Preferred
Shareholder  should  promptly  notify  the   Depositary  by  checking  the   box
immediately   following  the   Special  Payment   Instructions/Special  Delivery
Instructions and indicating the number of Shares lost, destroyed or stolen.  The
Preferred  Shareholder will then be instructed as to the procedures that must be
taken in order to replace the certificate. The tender of Shares pursuant to this
Letter of Transmittal and Proxy will not be valid unless prior to the Expiration
Date (as  defined  in the  Offer  to Purchase  and  Proxy Statement):  (a)  such
procedures  have been completed and a replacement certificate for the Shares has
been delivered to  the Depositary  or (b) a  Notice of  Guaranteed Delivery  and
Proxy has been delivered to the Depositary. See Instruction 2.
 
    IMPORTANT:  THIS  LETTER  OF  TRANSMITTAL AND  PROXY  (OR  A  FACSIMILE COPY
HEREOF),  DULY  EXECUTED,   TOGETHER  WITH,  IF   APPLICABLE,  CERTIFICATES   OR
CONFIRMATION  OF BOOK-ENTRY TRANSFER,  AND ALL OTHER  REQUIRED DOCUMENTS MUST BE
RECEIVED BY THE DEPOSITARY, OR, IF APPLICABLE, THE NOTICE OF GUARANTEED DELIVERY
AND PROXY MUST  BE RECEIVED BY  THE DEPOSITARY,  ON OR PRIOR  TO THE  APPLICABLE
EXPIRATION DATE (AS DEFINED IN THE OFFER TO PURCHASE AND PROXY STATEMENT).
 
                           IMPORTANT TAX INFORMATION
 
    Under  federal income tax law, a Preferred Shareholder whose tendered Shares
are accepted for payment is required  to provide the Depositary (as payer)  with
either  such Preferred Shareholder's correct TIN on Substitute Form W-9 below or
a properly completed Form W-8. If  such Preferred Shareholder is an  individual,
the TIN is his or her social security number. For businesses and other entities,
the  number is the federal employer  identification number. If the Depositary is
not provided with the correct TIN or properly completed Form W-8, the  Preferred
Shareholder  may be  subject to  a $50 penalty  imposed by  the Internal Revenue
Service. In addition, payments that are made to such Preferred Shareholder  with
respect  to Shares  purchased pursuant  to the  Offer may  be subject  to backup
withholding. The Form W-8 can be obtained from the Depositary. See the  enclosed
Guidelines  for Certification  of Taxpayer  Identification Number  on Substitute
Form W-9 for additional instructions.
 
    If federal income tax backup withholding applies, the Depositary is required
to withhold  31% of  any  payments made  to  the Preferred  Shareholder.  Backup
withholding  is not an additional tax.  Rather, the federal income tax liability
of persons subject to backup  withholding will be reduced  by the amount of  the
tax withheld. If withholding results in an overpayment of taxes, a refund may be
obtained.
 
PURPOSE OF SUBSTITUTE FORM W-9 AND FORM W-8
 
    To  avoid  backup  withholding on  payments  that  are made  to  a Preferred
Shareholder with  respect  to  Shares  purchased  pursuant  to  the  Offer,  the
Preferred Shareholder is required to notify the Depositary of his or her correct
TIN  by completing the  Substitute Form W-9 attached  hereto certifying that the
TIN provided  on Substitute  Form W-9  is  correct and  that (a)  the  Preferred
Shareholder has not been notified by the Internal Revenue Service that he or she
is  subject to federal income  tax backup withholding as  a result of failure to
report all  interest  or dividends  or  (b)  the Internal  Revenue  Service  has
notified  the  Preferred Shareholder  that he  or  she is  no longer  subject to
federal income tax
<PAGE>
backup withholding.  Foreign  Preferred  Shareholders  must  submit  a  properly
completed  Form  W-8  in  order  to  avoid  the  applicable  backup withholding;
provided, however, that backup withholding  will not apply to foreign  Preferred
Shareholders subject to 30% (or lower treaty rate) withholding on gross payments
received pursuant to the Offer.
 
WHAT NUMBER TO GIVE THE DEPOSITARY
 
    The  Preferred Shareholder  is required  to give  the Depositary  the social
security number or employer identification number of the registered owner of the
Shares. If the Shares are in  more than one name or are  not in the name of  the
actual  owner,  consult the  enclosed Guidelines  for Certification  of Taxpayer
Identification Number on Substitute  Form W-9 for  additional guidance on  which
number to report.
 
                       PAYER'S NAME: THE BANK OF NEW YORK
 
<TABLE>
<S>                               <C>                                  <C>
                                  Part 1 -- PLEASE PROVIDE YOUR TIN        Social Security Number OR
                                  IN THE BOX AT RIGHT AND CERTIFY BY    Employer Identification Number
                                  SIGNING AND DATING BELOW.                           TIN
                                  Name (Please Print)
                                  Address                              Part 2 --
SUBSTITUTE                        City State Zip Code                  Awaiting TIN  / /
                                  Part 3 -- CERTIFICATION -- UNDER THE PENALTIES OF PERJURY, I CERTIFY
                                  THAT: (1) the number shown on this form is my correct taxpayer
                                  identification number (or a TIN has not been issued to me but I have
                                  mailed or delivered an application to receive a TIN or intend to do so
                                  in the near future), (2) I am not subject to backup withholding either
                                  because I have not been notified by the Internal Revenue Service (the
                                  "IRS") that I am subject to backup withholding as a result of a
                                  failure to report all interest or dividends or the IRS has notified me
Form W-9                          that I am no longer subject to backup withholding and (3) all other
Department of the Treasury        information provided on this form is true, correct and complete.
Internal Revenue Service          SIGNATURE DATE, 1996
                                  You must cross out item (2) above if you have been notified by the IRS
                                  that you are currently subject to backup withholding because of
                                  underreporting interest or dividends on your tax return.
                                  NOTE: FAILURE TO COMPLETE AND RETURN THIS FORM MAY RESULT IN BACKUP
                                  WITHHOLDING OF 31% OF ANY PAYMENTS MADE TO YOU PURSUANT TO THE OFFER.
                                  PLEASE REVIEW THE ENCLOSED GUIDELINES FOR CERTIFICATION OF TAXPAYER
PAYER'S REQUEST FOR TAXPAYER      IDENTIFICATION NUMBER ON SUBSTITUTE FORM W-9 FOR ADDITIONAL DETAILS.
IDENTIFICATION NUMBER (TIN)       YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU CHECKED THE BOX IN
AND CERTIFICATION                 PART 2 OF SUBSTITUTE FORM W-9.
                                          CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER
                                  I certify under penalties of perjury that a taxpayer identification
                                  number has not been issued to me and either (1) I have mailed or
                                  delivered an application to receive a taxpayer identification number
                                  to the appropriate Internal Revenue Service Center or Social Security
                                  Administration Office or (2) I intend to do so in the near future. I
                                  understand that if I do not provide a taxpayer identification number
                                  by the time of payment, 31% of all payments of the purchase price made
                                  to me will be withheld until I provide a number.
                                  SIGNATURE DATE, 1996
</TABLE>
 
                              THE DEALER MANAGERS:
 
<TABLE>
<S>                                                 <C>
                SMITH BARNEY INC.                                  MORGAN STANLEY & CO.
               388 Greenwich Street                                    INCORPORATED
             New York, New York 10013                                 1585 Broadway
                  (800) 655-4811                                 New York, New York 10036
            Attention: Paul S. Galant                           (800) 223-2440, Ext. 1965
                                                                 Attention: Steve Sahara
</TABLE>
 
                             THE INFORMATION AGENT:
 
                                     [LOGO]
                                156 Fifth Avenue
                            New York, New York 10010
                         (212) 929-5500 (Call Collect)
                        Call Toll Free -- (800) 322-2885

<PAGE>


<PAGE>
                    NOTICE OF GUARANTEED DELIVERY AND PROXY
                                      FOR
                                 CINERGY CORP.
 
                           OFFER TO PURCHASE FOR CASH
                         ANY AND ALL OUTSTANDING SHARES
            OF THE FOLLOWING SERIES OF CUMULATIVE PREFERRED STOCK OF
 
                     THE CINCINNATI GAS & ELECTRIC COMPANY
 
                  Cumulative Preferred Stock ($100 par value):
 
                                    4% Series
                                 4 3/4% Series
                                 7 7/8% Series
                                 7 3/8% Series
 
    This  form, or a form substantially equivalent to this form, must be used to
accept the Offer (as defined  below) if certificates for  shares of a series  of
cumulative preferred stock of The Cincinnati Gas & Electric Company ("CG&E"), an
Ohio  corporation and direct  utility subsidiary of  Cinergy Corp., listed above
(each a  "Series  of Preferred")  to  be tendered  pursuant  to the  Offer  (the
"Shares")  are  not  immediately  available,  if  the  procedure  for book-entry
transfer cannot be completed on a timely  basis, or if time will not permit  all
other  documents required by the Letter of Transmittal and Proxy to be delivered
to the Depositary on or prior to the Expiration Date (as defined in the Offer to
Purchase and Proxy Statement referred to  below). Such form may be delivered  by
hand or transmitted by mail or by facsimile transmission, to the Depositary. See
"Terms  of the Offer -- Procedure for Tendering Shares" in the Offer to Purchase
and Proxy Statement.
 
    A SEPARATE NOTICE  OF GUARANTEED DELIVERY  AND PROXY MUST  BE USED FOR  EACH
SERIES OF PREFERRED.
 
    THE  ELIGIBLE  INSTITUTION WHICH  COMPLETES THIS  FORM MUST  COMMUNICATE THE
GUARANTEE TO THE DEPOSITARY AND MUST DELIVER THE LETTER OF TRANSMITTAL AND PROXY
AND CERTIFICATES FOR  SHARES TO  THE DEPOSITARY  WITHIN THE  TIME SHOWN  HEREIN.
FAILURE TO DO SO COULD RESULT IN A FINANCIAL LOSS TO SUCH ELIGIBLE INSTITUTION.
 
                      TO: THE BANK OF NEW YORK, DEPOSITARY
 
<TABLE>
<S>                                            <C>
                  BY MAIL:                             BY HAND OR OVERNIGHT COURIER:
        Tender & Exchange Department                   Tender & Exchange Department
               P.O. Box 11248                               101 Barclay Street
            Church Street Station                       Receive and Deliver Window
        New York, New York 10286-1248                    New York, New York 10286
</TABLE>
 
                           BY FACSIMILE TRANSMISSION:
 
                                 (212) 815-6213
 
                   INFORMATION AND CONFIRMATION BY TELEPHONE:
 
                                 (800) 507-9357
 
    DELIVERY  OF THIS INSTRUMENT TO AN ADDRESS  OTHER THAN AS SET FORTH ABOVE OR
TRANSMISSION OF INSTRUCTIONS VIA A FACSIMILE NUMBER OTHER THAN ONE LISTED  ABOVE
WILL NOT CONSTITUTE A VALID DELIVERY.
 
    This  form is not  to be used to  guarantee signatures. If  a signature on a
Letter of Transmittal  and Proxy  is required to  be guaranteed  by an  Eligible
Institution  (as  defined in  the  Letter of  Transmittal  and Proxy)  under the
instructions thereto, such  signature guarantee  must appear  in the  applicable
space provided in the signature box on the Letter of Transmittal and Proxy.
<PAGE>
    The  undersigned  hereby tenders  to Cinergy  Corp., a  Delaware corporation
("Cinergy"), upon the terms and subject to the conditions set forth in the Offer
to Purchase and Proxy Statement, dated  August 20, 1996 (the "Offer to  Purchase
and  Proxy Statement"), and  the related Letter of  Transmittal and Proxy (which
together constitute the "Offer"), receipt  of which is hereby acknowledged,  the
number of Shares listed below, pursuant to the guaranteed delivery procedure set
forth  in "Terms of the Offer -- Procedure for Tendering Shares" in the Offer to
Purchase and Proxy Statement.  WHILE PREFERRED SHAREHOLDERS  WHO WISH TO  TENDER
THEIR  SHARES  PURSUANT TO  THE OFFER  NEED NOT  VOTE IN  FAVOR OF  THE PROPOSED
AMENDMENT TO CG&E'S AMENDED ARTICLES OF INCORPORATION, AS SET FORTH IN THE OFFER
TO PURCHASE  AND  PROXY  STATEMENT  (THE "PROPOSED  AMENDMENT"),  THE  OFFER  IS
CONDITIONED  UPON  THE  PROPOSED AMENDMENT  BEING  APPROVED AND  ADOPTED  AT THE
SPECIAL MEETING (AS DEFINED  IN THE OFFER TO  PURCHASE AND PROXY STATEMENT).  IN
ADDITION,  PREFERRED  SHAREHOLDERS  HAVE  THE RIGHT  TO  VOTE  FOR  THE PROPOSED
AMENDMENT REGARDLESS OF WHETHER THEY TENDER  THEIR SHARES BY CASTING THEIR  VOTE
AND  SIGNING THE PROXY  CONTAINED WITHIN THE  ACCOMPANYING LETTER OF TRANSMITTAL
AND PROXY  OR BY  VOTING  IN PERSON  AT THE  SPECIAL  MEETING. IF  THE  PROPOSED
AMENDMENT IS APPROVED AND ADOPTED, CG&E WILL MAKE A SPECIAL CASH PAYMENT TO EACH
PREFERRED  SHAREHOLDER WHO  VOTED IN FAVOR  OF THE  PROPOSED AMENDMENT, PROVIDED
THAT THEIR SHARES ARE NOT TENDERED PURSUANT TO THE OFFER.
 
    The undersigned hereby also appoints  Jackson H. Randolph, James E.  Rogers,
and  William J.  Grealis, or  any of them,  as proxies,  each with  the power to
appoint his substitute, and hereby authorizes  them to represent and to vote  as
designated  hereunder and in their discretion with respect to any other business
properly brought before the Special Meeting, all shares of cumulative  preferred
stock  of CG&E which the undersigned is  entitled to vote at the Special Meeting
of Shareholders  to be  held on  September 18,  1996, or  any adjournment(s)  or
postponement(s) thereof.
 
    THIS  NOTICE OF GUARANTEED DELIVERY AND PROXY  IS SOLICITED ON BEHALF OF THE
BOARD OF DIRECTORS OF CG&E. THE PROXY CONTAINED HEREIN, WHEN PROPERLY  EXECUTED,
WILL  BE VOTED IN THE MANNER  DIRECTED HEREIN BY THE UNDERSIGNED SHAREHOLDER(S).
If no direction is made, the proxy will be voted FOR Item 1.
 
    Indicate your vote by an (X).  The Board of Directors recommends voting  FOR
Item 1.
 
ITEM 1.
 
    To  remove from the Amended Articles of Incorporation Article Fourth, Clause
6-A(b)  in  its  entirety,  which  limits  CG&E's  ability  to  issue  unsecured
indebtedness.
 
            / /  FOR            / /  AGAINST            / /  ABSTAIN
 
Series of Preferred (check one):
 
                  Cumulative Preferred Stock ($100 par value):
 
<TABLE>
<S>        <C>
/ /                4% Series
/ /            4 3/4% Series
/ /            7 7/8% Series
/ /            7 3/8% Series
</TABLE>
 
Number of Shares:
 
- ---------------------------------------------
 
Certificate Nos. (if available):
 
- ---------------------------------------------
 
- ---------------------------------------------
 
- ---------------------------------------------
 
- ---------------------------------------------
 
Please check box if you plan to attend the Special Meeting. / /
<PAGE>
                            SIGNATURE(S) OF OWNER(S)
 
X_______________________________________________________________________________
 
X_______________________________________________________________________________
Dated: ___________________________________________________________________, 1996
Name(s): _______________________________________________________________________
 
- --------------------------------------------------------------------------------
                                 (PLEASE PRINT)
Capacity (full title): _________________________________________________________
Address: _______________________________________________________________________
 
- --------------------------------------------------------------------------------
                               (INCLUDE ZIP CODE)
DAYTIME Area Code and Telephone No.: ___________________________________________
 
(Must  be signed by the registered holder(s) exactly as name(s) appear(s) on the
stock  certificate(s)  or  on  a  security  position  listing  or  by  person(s)
authorized   to  become  registered  holder(s)  by  certificates  and  documents
transmitted herewith. If  signature is  by a  trustee, executor,  administrator,
guardian, attorney-in-fact, officer of a corporation or other person acting in a
fiduciary  or  representative  capacity, please  set  forth full  title  and see
Instruction 5 to the Letter of Transmittal and Proxy.)
 
If  Shares   will   be   tendered   by
book-entry transfer, Name of Tendering
Institution:
 
- --------------------------------------
Account No.             at (check one)
 
/ /  The Depository Trust Company
/ /  Philadelphia Depository Trust
Company
 
- --------------------------------------
             Signature(s)
 
- --------------------------------------
     Name(s) of Record Holders(s)
            (Please Print)
 
- --------------------------------------
               Address
 
- --------------------------------------
    Area Code and Telephone Number
<PAGE>
               GUARANTEE (NOT TO BE USED FOR SIGNATURE GUARANTEE)
 
    The undersigned, a firm that is a member of a registered national securities
exchange or the National Association of Securities Dealers, Inc. or a commercial
bank  or trust company having  an office or correspondent  in the United States,
guarantees (a) that  the above-named person(s)  has a net  long position in  the
Shares  being tendered  within the meaning  of Rule 14e-4  promulgated under the
Securities Exchange Act  of 1934,  as amended, (b)  that such  tender of  Shares
complies  with Rule  14e-4 and (c)  to deliver to  the Depositary at  one of its
addresses set  forth above  certificate(s) for  the Shares  tendered hereby,  in
proper  form for transfer, or  a confirmation of the  book-entry transfer of the
Shares tendered hereby  into the  Depositary's account at  The Depository  Trust
Company  or Philadelphia  Depository Trust Company,  in each  case together with
properly completed  and duly  executed Letter(s)  of Transmittal  and Proxy  (or
facsimile(s)  thereof), with any  required signature guarantee(s)  and any other
required documents, all within three New York Stock Exchange trading days  after
the date hereof.
 
<TABLE>
<S>                                            <C>
- --------------------------------------------   --------------------------------------------
                Name of Firm                               Authorized Signature
 
- ---------------------------------------------  ---------------------------------------------
                   Address                                         Name
 
- ---------------------------------------------  ---------------------------------------------
            City, State, Zip Code                                  Title
 
- ---------------------------------------------
                Area Code and
              Telephone Number
Dated: , 1996
</TABLE>
 
           DO NOT SEND STOCK CERTIFICATES WITH THIS FORM. YOUR STOCK
      CERTIFICATES MUST BE SENT WITH THE LETTER OF TRANSMITTAL AND PROXY.

<PAGE>


<PAGE>
SMITH BARNEY INC.                              MORGAN STANLEY & CO. INCORPORATED
 
                            THE DEALER MANAGERS FOR
                                 CINERGY CORP.
 
                           OFFER TO PURCHASE FOR CASH
                       ANY AND ALL OUTSTANDING SHARES OF
             THE FOLLOWING SERIES OF CUMULATIVE PREFERRED STOCK OF
                     THE CINCINNATI GAS & ELECTRIC COMPANY
 
<TABLE>
<CAPTION>
                                                       CUSIP      PURCHASE
TITLE OF SERIES OF PREFERRED                          NUMBER        PRICE
- --------------------------------------------------  -----------  -----------
                                                                 (PER SHARE)
<S>                                                 <C>          <C>
Cumulative Preferred Stock
 ($100 par value)
 
4% Series.........................................  172070 203    $   64.00
 
4 3/4% Series.....................................  172070 302    $   80.00
 
7 7/8% Series.....................................  172070 864    $  116.00
 
7 3/8% Series.....................................  172070 849    $  110.00
</TABLE>
 
THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME, ON
          WEDNESDAY, SEPTEMBER 18, 1996, UNLESS THE OFFER IS EXTENDED.
 
                                                                 August 20, 1996
 
To Brokers, Dealers, Commercial Banks,
 Trust Companies and Other Nominees:
 
    In  our capacity  as Dealer Managers,  we are enclosing  the material listed
below relating  to  the invitation  of  Cinergy Corp.,  a  Delaware  corporation
("Cinergy"),  to the holders of each series of cumulative preferred stock of The
Cincinnati Gas  &  Electric Company,  an  Ohio corporation  and  direct  utility
subsidiary  of Cinergy ("CG&E"), listed above  (each a "Series of Preferred") to
tender any and  all of  their shares  of a  Series of  Preferred ("Shares")  for
purchase  at the  purchase price per  Share listed  above, net to  the seller in
cash, upon the terms  and subject to  the conditions set forth  in the Offer  to
Purchase  and Proxy Statement, dated August 20, 1996 (the "Offer to Purchase and
Proxy Statement"), and  in the Letter  of Transmittal and  Proxy for the  Shares
tendered.  As  to each  Series of  Preferred,  the Offer  to Purchase  and Proxy
Statement, together  with  the  applicable  Letter  of  Transmittal  and  Proxy,
constitutes  the "Offer". Cinergy will purchase  all Shares validly tendered and
not withdrawn, upon the terms  and subject to the  conditions of the Offer.  The
Offer  for a Series of  Preferred is not conditioned  upon any minimum number of
Shares of such  Series of  Preferred being tendered  and is  independent of  the
Offer  for any other Series of  Preferred. WHILE PREFERRED SHAREHOLDERS WHO WISH
TO TENDER THEIR  SHARES PURSUANT  TO THE  OFFER NEED NOT  VOTE IN  FAVOR OF  THE
PROPOSED  AMENDMENT TO CG&E'S AMENDED ARTICLES OF INCORPORATION, AS SET FORTH IN
THE OFFER TO PURCHASE AND PROXY STATEMENT (THE "PROPOSED AMENDMENT"), THE  OFFER
IS  CONDITIONED UPON  THE PROPOSED AMENDMENT  BEING APPROVED AND  ADOPTED AT THE
SPECIAL MEETING (AS DEFINED  IN THE OFFER TO  PURCHASE AND PROXY STATEMENT).  IN
ADDITION,  PREFERRED  SHAREHOLDERS  HAVE  THE RIGHT  TO  VOTE  FOR  THE PROPOSED
AMENDMENT  REGARDLESS  OF  WHETHER  THEY  TENDER  THEIR  SHARES.  SEE  "PROPOSED
AMENDMENT  AND PROXY SOLICITATION", "TERMS OF THE OFFER -- CERTAIN CONDITIONS OF
THE OFFER" AND "TERMS OF THE  OFFER -- EXTENSION OF TENDER PERIOD;  TERMINATION;
AMENDMENTS" IN THE OFFER TO PURCHASE AND PROXY STATEMENT.
 
    We  are  asking  you  to  contact your  clients  for  whom  you  hold Shares
registered in your  name (or in  the name of  your nominee) or  who hold  Shares
registered  in their  own names.  Please bring the  Offer to  their attention as
promptly as possible.
<PAGE>
    Cinergy will pay  a solicitation  fee of $1.50  per Share  (except that  for
transactions  for  beneficial owners  equal to  or exceeding  5,000 Shares  of a
particular Series of Preferred, Cinergy will pay a solicitation fee of $1.25 per
Share) for any Shares  tendered, accepted for payment  and paid pursuant to  the
Offer  covered by a Letter of Transmittal  and Proxy which designates, as having
solicited and obtained  the tender,  the name  of (i)  any broker  or dealer  in
securities,  including  the Dealer  Managers in  their capacity  as a  broker or
dealer, which is a member of any national securities exchange or of the National
Association of Securities Dealers, Inc. (the "NASD"), (ii) any foreign broker or
dealer not eligible for membership  in the NASD which  agrees to conform to  the
NASD's Rules of Fair Practice in soliciting tenders outside the United States to
the  same extent as  though it were an  NASD member, or (iii)  any bank or trust
company (each of which is referred to herein as a "Soliciting Dealer"). No  such
fee shall be payable to a Soliciting Dealer with respect to the tender of Shares
by  a holder unless the Letter of Transmittal and Proxy accompanying such tender
designates such Soliciting Dealer. No such fee shall be payable to a  Soliciting
Dealer  in respect of  Shares registered in  the name of  such Soliciting Dealer
unless such Shares are held by such Soliciting Dealer as nominee and such Shares
are being tendered for the benefit  of one or more beneficial owners  identified
on  the Letter of  Transmittal and Proxy  or on the  Notice of Solicited Tenders
(included below). No such fee  shall be payable to  a Soliciting Dealer if  such
Soliciting  Dealer is required for any reason to transfer the amount of such fee
to a depositing  holder (other  than itself).  No such fee  shall be  paid to  a
Soliciting  Dealer with respect to Shares  tendered for such Soliciting Dealer's
own account. No broker, dealer, bank, trust company or fiduciary shall be deemed
to be  the agent  of Cinergy,  the  Depositary (as  defined below),  the  Dealer
Managers or the Information Agent for purposes of the Offer.
 
    Cinergy will also, upon request, reimburse Soliciting Dealers for reasonable
and  customary  handling and  mailing expenses  incurred  by them  in forwarding
materials relating to the Offer to  their customers. Cinergy will pay all  stock
transfer  taxes  applicable to  its purchase  of Shares  pursuant to  the Offer,
subject to Instruction 6 of the Letter of Transmittal and Proxy.
 
    In order for a Soliciting Dealer to receive a solicitation fee, The Bank  of
New  York,  as  Depositary  (the "Depositary"),  must  have  received  from such
Soliciting Dealer a  properly completed  and duly executed  Notice of  Solicited
Tenders in the form attached hereto (or facsimile thereof) within three business
days after the expiration of the Offer.
 
    For  your information and for  forwarding to your clients  for whom you hold
Shares registered  in  your name  (or  in the  name  of your  nominee),  we  are
enclosing the following documents:
 
        1.  The Offer to Purchase and Proxy Statement, dated August 20, 1996.
 
        2.    A separate  Letter of  Transmittal  and Proxy  for each  Series of
    Preferred for your use and for the information of your clients.
 
        3.  A letter to shareholders of CG&E from its Chairman of the Board  and
    its Vice Chairman and Chief Executive Officer.
 
        4.   A Notice of Guaranteed Delivery and  Proxy to be used to accept the
    Offer if the Shares and all other required documents cannot be delivered  to
    the Depositary by the applicable Expiration Date (as defined in the Offer to
    Purchase and Proxy Statement).
 
        5.    A form  of letter  which may  be  sent to  your clients  for whose
    accounts you hold  Shares registered in  your name  or in the  name of  your
    nominee,  with space for obtaining such clients' instructions with regard to
    the Offer and with regard to the proxy solicitation by CG&E.
 
        6.   Guidelines of  the Internal  Revenue Service  for Certification  of
    Taxpayer Identification Number on Substitute Form W-9, providing information
    relating to backup federal income tax withholding.
 
        7.  A return envelope addressed to The Bank of New York, the Depositary.
 
    EACH  SERIES OF PREFERRED HAS  ITS OWN LETTER OF  TRANSMITTAL AND PROXY, AND
ONLY THE APPLICABLE LETTER OF TRANSMITTAL AND PROXY FOR A PARTICULAR SERIES OR A
NOTICE OF GUARANTEED DELIVERY  AND PROXY MAY  BE USED TO  TENDER SHARES OF  SUCH
SERIES OF PREFERRED.
 
                                       2
<PAGE>
    WE  URGE YOU TO  CONTACT YOUR CLIENTS  AS PROMPTLY AS  POSSIBLE. PLEASE NOTE
THAT THE OFFER AND  WITHDRAWAL RIGHTS WILL  EXPIRE AT 5:00  P.M., NEW YORK  CITY
TIME, ON WEDNESDAY, SEPTEMBER 18, 1996, UNLESS THE OFFER IS EXTENDED.
 
    NEITHER CINERGY, CG&E, THEIR RESPECTIVE BOARDS OF DIRECTORS NOR ANY OF THEIR
RESPECTIVE  OFFICERS MAKES ANY RECOMMENDATION TO ANY PREFERRED SHAREHOLDER AS TO
WHETHER TO TENDER ANY OR ALL SHARES. EACH PREFERRED SHAREHOLDER MUST MAKE HIS OR
HER OWN DECISION AS TO WHETHER TO TENDER  SHARES AND, IF SO, HOW MANY SHARES  TO
TENDER.
 
    Any  questions  or  requests  for assistance  or  additional  copies  of the
enclosed materials may be directed to MacKenzie Partners, Inc., the  Information
Agent,  or to us, as Dealer Managers,  at the respective addresses and telephone
numbers set forth on the back cover of the enclosed Offer to Purchase and  Proxy
Statement.
 
                                    Very truly yours,
 
                                    Smith Barney Inc.       Morgan Stanley & Co.
                                    Incorporated
 
    NOTHING  CONTAINED HEREIN OR IN THE  ENCLOSED DOCUMENTS SHALL CONSTITUTE YOU
OR ANY  PERSON  AS  THE  AGENT  OF  CINERGY,  CG&E,  THE  DEALER  MANAGERS,  THE
INFORMATION AGENT OR THE DEPOSITARY, OR AUTHORIZE YOU OR ANY OTHER PERSON TO USE
ANY  DOCUMENT OR MAKE ANY STATEMENT ON BEHALF  OF ANY OF THEM IN CONNECTION WITH
THE OFFER  OTHER  THAN  THE  DOCUMENTS  ENCLOSED  HEREWITH  AND  THE  STATEMENTS
CONTAINED THEREIN.
 
                                       3
<PAGE>
                          NOTICE OF SOLICITED TENDERS
 
    List  below the  number of  Shares tendered  by each  beneficial owner whose
tender you have  solicited. All  Shares in  a Series  of Preferred  beneficially
owned  by a beneficial owner, whether in  one account or several, and in however
many capacities, must be aggregated for purposes of completing the table  below.
Any  questions as to what constitutes beneficial ownership should be directed to
the Depositary. If the space below is inadequate, list the Shares in a  separate
signed  schedule and affix the list to  this Notice of Solicited Tenders. PLEASE
DO NOT  COMPLETE THE  SECTIONS OF  THE TABLE  HEADED "TO  BE COMPLETED  ONLY  BY
DEPOSITARY".
 
    ALL  NOTICES OF SOLICITED  TENDERS SHOULD BE RETURNED  TO, AND ALL QUESTIONS
CONCERNING  THE  NOTICES  OF  SOLICITED  TENDERS  SHOULD  BE  DIRECTED  TO,  THE
DEPOSITARY.  ALL NOTICES OF SOLICITED TENDERS MUST BE RECEIVED BY THE DEPOSITARY
WITHIN THREE BUSINESS DAYS AFTER THE EXPIRATION DATE.
 
<TABLE>
<CAPTION>
                                TO BE COMPLETED BY                                     TO BE COMPLETED ONLY BY
                              THE SOLICITING DEALER                                          DEPOSITARY
- ----------------------------------------------------------------------------------  -----------------------------
                                                  SERIES OF      NUMBER OF SHARES   NUMBER OF SHARES
BENEFICIAL OWNERS                                 PREFERRED          TENDERED           ACCEPTED          FEE*
- --------------------------------------------  -----------------  -----------------  -----------------  ----------
<S>                                           <C>                <C>                <C>                <C>
No. 1.......................................
No. 2.......................................
No. 3.......................................
No. 4.......................................
No. 5.......................................
No. 6.......................................
No. 7.......................................
No. 8.......................................
No. 9.......................................
No. 10......................................
Total.......................................
</TABLE>
 
- ------------------------
 *  $1.50 per Share (except that for transactions for beneficial owners equal to
    or exceeding 5,000 Shares of a particular Series of Preferred, fee is  $1.25
    per  Share) for any Shares tendered,  accepted for payment and paid pursuant
    to the Offer.
 
    All questions as to  the validity, form and  eligibility (including time  of
receipt)  of Notices of Solicited Tenders  will be determined by the Depositary,
in its sole discretion, which determination  will be final and binding.  Neither
the  Depositary nor any other person will be under any duty to give notification
of any defects or irregularities in any Notice of Solicited Tenders or incur any
liability for failure to give such notification.
 
    The  undersigned  hereby  confirms  that:  (i)  it  has  complied  with  the
applicable  requirements of the Securities Exchange Act of 1934, as amended, and
the applicable  rules  and  regulations  thereunder,  in  connection  with  such
solicitation;  (ii) it  is entitled to  such compensation  for such solicitation
under the terms  and conditions  of the Offer;  (iii) in  soliciting tenders  of
Shares,  it  has used  no  soliciting materials  other  than those  furnished by
Cinergy; and  (iv)  if  it is  a  foreign  broker or  dealer  not  eligible  for
membership  in the NASD,  it has agreed to  conform to the  NASD's Rules of Fair
Practice in making solicitations.
 
<TABLE>
<S>                                            <C>
- --------------------------------------------   --------------------------------------------
 Firm Name                                      Address (Including Zip Code)
 
- --------------------------------------------   --------------------------------------------
 By:                                            Area Code and Telephone Number
 Title:
</TABLE>
 
                                       4

<PAGE>


<PAGE>
                                 CINERGY CORP.
                           OFFER TO PURCHASE FOR CASH
                         ANY AND ALL OUTSTANDING SHARES
            OF THE FOLLOWING SERIES OF CUMULATIVE PREFERRED STOCK OF
                     THE CINCINNATI GAS & ELECTRIC COMPANY
 
<TABLE>
<CAPTION>
                                                          Outstanding   Purchase Price
             Title of Series of Preferred                   Shares        (per share)
- -------------------------------------------------------  -------------  ---------------
<S>                                                      <C>            <C>
              Cumulative Preferred Stock
                   ($100 par value)
4% Series..............................................      270,000       $    64.00
4 3/4% Series..........................................      130,000       $    80.00
7 7/8% Series..........................................      800,000       $   116.00
7 3/8% Series..........................................      800,000       $   110.00
</TABLE>
 
THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME, ON
WEDNESDAY, SEPTEMBER 18, 1996, UNLESS THE OFFER IS EXTENDED.
 
                                                                 August 20, 1996
 
To Our Clients:
 
    Enclosed  for  your  consideration  are  the  Offer  to  Purchase  and Proxy
Statement, dated August 20, 1996, and a separate Letter of Transmittal and Proxy
for each series of  cumulative preferred stock listed  above (each a "Series  of
Preferred")  of The Cincinnati  Gas & Electric Company,  an Ohio corporation and
direct utility subsidiary of Cinergy Corp. ("CG&E"), of which you own shares. As
to each Series of Preferred, the Offer to Purchase and Proxy Statement, together
with the applicable Letter of Transmittal and Proxy, constitutes the "Offer"  of
Cinergy  Corp.  ("Cinergy") to  purchase any  and  all shares  of the  Series of
Preferred ("Shares") at the  purchase price per Share  listed above, net to  the
seller  in cash,  upon the  terms and  subject to  the conditions  of the Offer.
Cinergy will purchase all  Shares validly tendered and  not withdrawn, upon  the
terms  and subject  to the conditions  of the Offer.  The Offer for  a Series of
Preferred is not conditioned upon any minimum number of Shares of such Series of
Preferred being tendered and is independent of the Offer for any other Series of
Preferred. While Preferred Shareholders who wish to tender their Shares pursuant
to the Offer need not vote in favor of the proposed amendment to CG&E's  Amended
Articles  of Incorporation,  as set  forth in  the Offer  to Purchase  and Proxy
Statement (the "Proposed Amendment"), the Offer is conditioned upon the Proposed
Amendment being approved and adopted at  the Special Meeting (as defined in  the
Offer to Purchase and Proxy Statement). In addition, Preferred Shareholders have
the  right to vote for the Proposed  Amendment regardless of whether they tender
their Shares. See  "Proposed Amendment  and Proxy Solicitation",  "Terms of  the
Offer  -- Certain Conditions of the Offer"  and "Terms of the Offer -- Extension
of Tender Period; Termination;  Amendments" in the Offer  to Purchase and  Proxy
Statement.
 
    WE  ARE  THE  HOLDER OF  RECORD  OF SHARES  HELD  FOR YOUR  ACCOUNT  BUT NOT
REGISTERED IN YOUR NAME. A TENDER OR A  VOTE OF SUCH SHARES CAN BE MADE ONLY  BY
US  AS THE  HOLDER OF RECORD  AND PURSUANT  TO YOUR INSTRUCTIONS.  ANY LETTER OF
TRANSMITTAL AND PROXY FURNISHED TO YOU IS SOLELY FOR YOUR INFORMATION AND CANNOT
BE USED BY YOU TO TENDER OR VOTE SHARES HELD BY US FOR YOUR ACCOUNT.
 
    We request instructions as to whether you wish us to tender and/or vote  any
or  all of the Shares held by us for your account, upon the terms and subject to
the conditions set forth in the Offer.
 
    PLEASE READ THE FOLLOWING INFORMATION CAREFULLY:
<PAGE>
        (1) The Offer is  for any and  all Shares outstanding  as of August  20,
    1996.  The Offer for a  Series of Preferred is  independent of the Offer for
    any other Series of Preferred.
 
        (2) The Offer and withdrawal rights  will expire at 5:00 p.m., New  York
    City  time, on September 18, 1996, unless the Offer is extended with respect
    to a Series of Preferred. Your instructions to us should be forwarded to  us
    in  ample  time to  permit  us to  submit  a tender  on  your behalf  by the
    expiration of the Offer. If you would  like to withdraw your Shares that  we
    have tendered, you can withdraw them so long as the Offer remains open or at
    any  time after the expiration of  forty business days from the commencement
    of the Offer if such tendered Shares have not been accepted for payment.
 
        (3) While  Preferred  Shareholders  who  wish  to  tender  their  Shares
    pursuant  to the Offer need not vote in favor of the Proposed Amendment, the
    Offer is conditioned upon the Proposed Amendment being approved and  adopted
    at the Special Meeting.
 
        (4)  Preferred  Shareholders have  the  right to  vote  in favor  of the
    Proposed Amendment regardless of whether they tender their Shares.
 
        (5) Any stock transfer taxes applicable to the sale of Shares to Cinergy
    pursuant to the Offer will be paid by Cinergy, except as otherwise  provided
    in Instruction 6 of the Letter of Transmittal and Proxy.
 
    NEITHER CINERGY, CG&E, THEIR RESPECTIVE BOARDS OF DIRECTORS NOR ANY OF THEIR
RESPECTIVE  OFFICERS MAKES ANY RECOMMENDATION TO ANY PREFERRED SHAREHOLDER AS TO
WHETHER TO TENDER ANY OR ALL SHARES. EACH PREFERRED SHAREHOLDER MUST MAKE HIS OR
HER OWN DECISION AS TO WHETHER TO TENDER  SHARES AND, IF SO, HOW MANY SHARES  TO
TENDER.
 
    If  you wish to have us tender and/or vote any or all of your Shares held by
us for your account upon  the terms and subject to  the conditions set forth  in
the  Offer,  please  so  instruct us  by  completing,  executing,  detaching and
returning to us the instruction form on the detachable part hereof. An  envelope
to  return your instructions to us is  enclosed. If you authorize tender of your
Shares, all  such Shares  will be  tendered unless  otherwise specified  on  the
detachable  part hereof.  Your instructions should  be forwarded to  us in ample
time to  permit  us to  submit  a  tender and/or  vote  on your  behalf  by  the
expiration of the Offer or the Special Meeting, as applicable.
 
    The  Offer is being made  to all holders of Shares.  Cinergy is not aware of
any state  where the  making of  the Offer  is prohibited  by administrative  or
judicial  action pursuant to a valid state  statute. If Cinergy becomes aware of
any valid state statute prohibiting the making of the Offer, Cinergy will make a
good faith effort to comply with such statute. If, after such good faith effort,
Cinergy cannot comply with such statute, the Offer will not be made to, nor will
tenders be accepted from or  on behalf of, holders of  Shares in such state.  In
those  jurisdictions where  the securities, blue  sky or other  laws require the
Offer to be made by a licensed broker or dealer, the Offer shall be deemed to be
made on behalf of Cinergy  by the Dealer Managers (as  defined in the Offer)  or
one  or  more registered  brokers or  dealers  licensed under  the laws  of such
jurisdictions.
 
                                       2
<PAGE>
                                  INSTRUCTIONS
                   WITH RESPECT TO OFFER TO PURCHASE FOR CASH
                       ANY AND ALL OUTSTANDING SHARES OF
                            THE PREFERRED STOCK OF,
                           AND PROXY SOLICITATION BY,
                     THE CINCINNATI GAS & ELECTRIC COMPANY
 
    The undersigned acknowledge(s) receipt of your letter and the enclosed Offer
to Purchase and Proxy Statement, dated August 20, 1996, and a separate Letter of
Transmittal and Proxy for each series of preferred stock of The Cincinnati Gas &
Electric Company (each a  "Series of Preferred") in  which the undersigned  owns
shares  (as  to  each Series  of  Preferred,  the Offer  to  Purchase  and Proxy
Statement, together  with  the  applicable  Letter  of  Transmittal  and  Proxy,
constitutes  the "Offer")  in connection  with the  invitation of  Cinergy Corp.
("Cinergy") to the holders of each Series of Preferred to tender any and all  of
their  shares of a Series  of Preferred ("Shares") for  purchase at the purchase
price per Share listed  on the front  cover of the Offer  to Purchase and  Proxy
Statement,  net  to  the seller  in  cash, upon  the  terms and  subject  to the
conditions of the  Offer, and in  connection with the  proxy solicitation  being
conducted by the Board of Directors of The Cincinnati Gas & Electric Company.
 
    This  will instruct you to tender to  Cinergy the number of Shares indicated
below (or, if no number  is indicated below, all Shares)  which are held by  you
for the account of the undersigned, upon the terms and subject to the conditions
of the Offer.
 
<TABLE>
<S>                                     <C>
         Series of Preferred               Number of Shares to be Tendered*
 
- -------------------------------------   -------------------------------------
 
- -------------------------------------   -------------------------------------
 
- -------------------------------------   -------------------------------------
 
- -------------------------------------   -------------------------------------
 
- -------------------------------------   -------------------------------------
</TABLE>
 
    You are further instructed to vote as designated hereunder in respect of the
Proposed  Amendment all shares which the undersigned  is entitled to vote at the
Special Meeting:**
 
             / / FOR             / / AGAINST             / / ABSTAIN
 
                                   SIGN HERE
 
<TABLE>
<S>               <C>                                                      <C>
   Signature(s):  ------------------------------------------------------
 
    Name(s):
                  ------------------------------------------------------
 
    Address:
                  ------------------------------------------------------
                  ------------------------------------------------------
 
Dated: , 1996
Social Security
or Taxpayer
Identification
No.:              ------------------------------------------------------
</TABLE>
 
 *  By executing and  returning these Instructions, unless otherwise  indicated,
    it  will be assumed  that all Shares held  by us for your  account are to be
    tendered.
 
**  By executing and  returning these Instructions, unless otherwise  indicated,
    it  will be assumed  that all Shares held  by us for your  account are to be
    voted FOR the Proposed Amendment.
 
                                       3

<PAGE>


<PAGE>
   [LOGO]
 
                The Cincinnati Gas & Electric Company
                139 East Fourth Street, Cincinnati, Ohio 45202
 
                   [LOGO]
 
                                                                 August 20, 1996
 
Dear Shareholder:
 
    Please  find enclosed important information  pertaining to the following two
items:
 
    (i) a  proposed amendment  to  the Amended  Articles of  Incorporation  (the
       "Articles")  of The Cincinnati Gas & Electric Company ("CG&E") which will
       be considered at a Special Meeting of its Shareholders; and
 
    (ii) an offer by Cinergy Corp. to purchase the outstanding shares of  CG&E's
       cumulative preferred stock.
 
We will greatly appreciate your giving prompt attention to the enclosed material
which you are urged to read in its entirety.
 
    The Articles presently limit CG&E's ability to issue securities representing
unsecured  indebtedness, including short-term  debt, to no more  than 20% of the
aggregate of its capital, surplus and secured debt. This 20% restriction  limits
CG&E's  flexibility  in planning  and  financing its  business  activities. With
flexibility and cost leadership being crucial factors to being successful in the
new competitive  utility  environment,  CG&E  ultimately  may  be  placed  at  a
competitive  disadvantage if this restriction is  not removed from the Articles.
The proposed amendment,  as set  forth and explained  in the  enclosed Offer  to
Purchase and Proxy Statement, would remove the 20% restriction.
 
    Concurrently  with CG&E's proxy  solicitation, Cinergy Corp.  is offering to
purchase the outstanding shares of CG&E's cumulative preferred stock. While  you
need not vote in favor of the proposed amendment in order to tender your shares,
Cinergy's  offer is conditioned  upon the proposed  amendment being approved and
adopted at the Special Meeting. In addition, you have the right to vote for  the
proposed  amendment regardless of whether you tender your shares. If you vote in
favor of the proposed amendment and it passes, you will be entitled to receive a
special cash payment in the  amount of $1.00 per share  for each share that  you
vote,  provided your shares  have not been  tendered. Instructions for tendering
your shares and information pertaining to the special cash payment are  included
with the enclosed material.
 
    It  is important to your interests  that all shareholders, regardless of the
number of shares owned, participate in the  affairs of the Company. Even if  you
plan  to attend  the Special  Meeting, WE URGE  YOU TO  MARK, SIGN  AND DATE THE
ENCLOSED PROXY, WHICH IS INCLUDED WITHIN THE ENCLOSED LETTER OF TRANSMITTAL  AND
PROXY, AND RETURN IT PROMPTLY. By signing and returning your proxy promptly, you
are assuring that your shares will be voted.
 
    You  are cordially invited to attend the  Special Meeting which will be held
at CG&E's  principal  office,  139  East Fourth  Street,  Cincinnati,  Ohio,  on
Wednesday, September 18, 1996 at 4:00 p.m., eastern daylight saving time.
 
    If  you  have  questions regarding  the  proposed amendment  or  the Special
Meeting, please call MacKenzie Partners,  Inc., the Information Agent, at  (800)
322-2885.  Questions  about Cinergy's  tender offer  should  be direct  to Smith
Barney Inc. at  (800) 655-4811  or Morgan Stanley  & Co.  Incorporated at  (800)
223-2440 Extension 1965.
 
    Thank you for your continued interest in the Company.
 
Sincerely yours,
 
<TABLE>
<S>                                            <C>
 [/S/ JACKSON H. RANDOLPH]                     [/S/ JAMES E. ROGERS]
Jackson H. Randolph                            James E. Rogers
Chairman of the Board                          Vice Chairman and
                                               Chief Executive Officer
</TABLE>

<PAGE>


<PAGE>
                     THE CINCINNATI GAS & ELECTRIC COMPANY
                             139 EAST FOURTH STREET
                             CINCINNATI, OHIO 45202
 
                                 --------------
 
                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                        TO BE HELD ON SEPTEMBER 18, 1996
                                 -------------
 
To the Shareholders Of
The Cincinnati Gas & Electric Company:
 
    NOTICE  IS  HEREBY  GIVEN that  a  Special  Meeting of  Shareholders  of The
Cincinnati Gas & Electric Company ("CG&E") will be held at its principal office,
139 East Fourth Street,  Cincinnati, Ohio, on Wednesday,  September 18, 1996  at
4:00 p.m., eastern daylight saving time, for purposes of considering the removal
from  the Amended Articles of Incorporation ARTICLE FOURTH, Clause 6-A(b), which
Clause limits CG&E's  ability to  issue unsecured  indebtedness and  transacting
such other business as may legally come before the meeting.
 
    Only  shareholders of record  at the close  of business on  Monday, July 22,
1996, will be entitled to  vote at the meeting  and at any adjournment  thereof.
Holders of cumulative preferred stock ("Preferred Shareholders"), whether or not
they  now expect to be  present at the meeting, are  requested to mark, date and
sign the  proxy contained  within  the accompanying  Letter of  Transmittal  and
Proxy,  and return it  promptly. Preferred Shareholders  who execute and deliver
the proxy contained within the accompanying Letter of Transmittal and Proxy have
the power to revoke such proxy at  any time before the authority granted by  the
proxy is exercised.
 
                                         THE CINCINNATI GAS & ELECTRIC COMPANY
 
                                         BY CHERYL M. FOLEY, SECRETARY
 
Dated: August 20, 1996





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