COMMONWEALTH EDISON CO
424B5, 1994-07-01
ELECTRIC SERVICES
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<PAGE>

                                                FILED PURSUANT TO RULE 424(b)(5)
                                                       REGISTRATION NO. 33-51379
PROSPECTUS SUPPLEMENT
(TO PROSPECTUS DATED JUNE 29, 1994)
 
                                3,000,000 SHARES
 
                          COMMONWEALTH EDISON COMPANY
 
                       $2.425 CUMULATIVE PREFERENCE STOCK
                              (WITHOUT PAR VALUE)
 
                               ----------------
 
  The $2.425 Cumulative Preference Stock, without par value (the "Offered
Preference"), offered hereby is not redeemable by the Company prior to August
1, 1999. On and after that date, the Offered Preference will be redeemable at
any time at the option of the Company, in whole or in part, at $25 per share,
plus accrued and unpaid dividends to the date of redemption. See "$2.425
Cumulative Preference Stock" herein.
 
  Application is being made to list the Offered Preference on the New York
Stock Exchange. Listing will be subject to meeting the requirements of the
Exchange, including those relating to distribution.
 
                               ----------------
 
THESE  SECURITIES HAVE NOT BEEN APPROVED  OR DISAPPROVED BY THE SECURITIES  AND
 EXCHANGE  COMMISSION   OR  ANY  STATE  SECURITIES  COMMISSION  NOR   HAS  THE
  SECURITIES  AND  EXCHANGE COMMISSION  OR  ANY STATE  SECURITIES  COMMISSION
   PASSED UPON  THE ACCURACY  OR ADEQUACY OF  THIS PROSPECTUS  SUPPLEMENT OR
    THE ACCOMPANYING  PROSPECTUS. ANY REPRESENTATION  TO THE CONTRARY  IS A
     CRIMINAL OFFENSE.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                              Underwriting
                            Price to            Discounts          Proceeds to
                            Public(1)      and Commissions(2)     Company(1)(3)
- -------------------------------------------------------------------------------
<S>                    <C>                 <C>                 <C>
Per Share............        $25.00              $.7875             $24.2125
- -------------------------------------------------------------------------------
Total................      $75,000,000         $2,362,500          $72,637,500
</TABLE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
(1) Plus accrued dividends, if any, from July 7, 1994.
(2) See "Underwriting."
(3) Before deducting expenses estimated at $300,000, which are payable by the
    Company.
 
                               ----------------
 
  The Offered Preference is offered by the Underwriters, subject to prior sale,
when, as and if delivered to and accepted by the Underwriters, and subject to
their right to reject orders in whole or in part. It is expected that delivery
of the Offered Preference will be made in New York City on or about July 7,
1994.
 
                               ----------------
 
PAINEWEBBER INCORPORATED
                              MERRILL LYNCH & CO.
                                                            SALOMON BROTHERS INC
 
                               ----------------
 
            THE DATE OF THIS PROSPECTUS SUPPLEMENT IS JUNE 29, 1994.
<PAGE>
 
  IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE SECURITIES
OFFERED HEREBY AT A LEVEL ABOVE THAT WHICH MIGHT OTHERWISE PREVAIL IN THE OPEN
MARKET. SUCH TRANSACTIONS MAY BE EFFECTED ON THE NEW YORK STOCK EXCHANGE OR
OTHERWISE. SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
 
                               ----------------
 
                       $2.425 CUMULATIVE PREFERENCE STOCK
     
  The following information concerning the Offered Preference supplements and
should be read in conjunction with the statements under "Description of Stock"
in the accompanying Prospectus. Capitalized terms not defined in this
Prospectus Supplement are used as defined in the accompanying Prospectus.
 
LIQUIDATION PREFERENCES.
 
  In the event of any voluntary or involuntary liquidation, dissolution or
winding up of the Company, the holders of the Offered Preference at the time
outstanding, together with all such other shares of preference stock then
outstanding, will be entitled to receive out of assets of the Company available
for distribution to shareholders, before any distribution of assets is made to
holders of common stock or any other class of stock ranking junior to the
Offered Preference upon liquidation, liquidating distributions in the amount of
$25 per share, plus accrued and unpaid dividends thereon. See "Description of
Stock," subcaption "Liquidation Preferences" in the accompanying Prospectus.
 
DIVIDENDS.
 
  Dividends on the 3,000,000 shares of the Offered Preference, when and as
declared by the Board of Directors, will be payable quarterly on the first day
of February, May, August and November in each year, at the rate of $2.425 per
share per annum. The first dividend on the shares of Offered Preference will be
payable on August 1, 1994, to shareholders of record on July 20, 1994, in the
amount of $.1647 per share. Dividends on the Offered Preference are cumulative;
however, accumulations of dividends do not bear interest. Dividends are payable
on any outstanding shares of Prior Preferred Stock and the outstanding shares
of the $1.425 Convertible Preferred Stock in preference to any dividends on the
outstanding shares of any series of preference stock of the Company (including
the Offered Preference).
 
  As of May 31, 1994, the Company had $452 million of retained earnings. Under
Illinois law, a utility may not pay any dividend on its stock unless "[t]he
utility's earnings and earned surplus are sufficient to declare and pay same
after provision is made for reasonable and proper reserves," or unless the
utility has specific authorization from the Illinois Commerce Commission. The
Company has taken steps generally designed to preserve retained earnings,
including implementing a cost reduction plan in the second half of 1992 and
reducing the quarterly common stock dividend from seventy-five cents per share
to forty cents. See Notes A, B, C and E on pages 5 through 8 of the
accompanying Prospectus and "Management's Discussion and Analysis of Financial
Condition and Results of Operations" and Notes 2, 3 and 17 of Notes to
Financial Statements in the Company's Quarterly Report on Form 10-Q for the
quarterly period ended March 31, 1994.
 
REDEMPTION.
 
  The Offered Preference is not redeemable prior to August 1, 1999. On and
after that date and subject to the provisions described under "Description of
Stock" in the Prospectus, the Offered Preference is redeemable at any time or
from time to time on not less than 30 or more than 60 days' notice by mail, in
whole or in part, at the option of the Company, at $25 per share, plus accrued
and unpaid dividends to the date of redemption.
 
TRANSFER AGENT AND REGISTRAR.
 
  The Transfer Agent and Registrar for the Offered Preference is The First
Chicago Trust Company of New York in New York, New York and Chicago, Illinois.
 
                                      S-2
<PAGE>
 
                                  UNDERWRITING
 
  Subject to the terms and conditions set forth in an underwriting agreement
(the "Underwriting Agreement") between the Company and PaineWebber
Incorporated, as representative of the several underwriters named therein (the
"Underwriters"), the Company has agreed to sell to each of the Underwriters,
and each of the Underwriters has severally agreed to purchase, the number of
shares of Offered Preference set forth after their names below. The
Underwriting Agreement provides that the obligations of the Underwriters are
subject to certain conditions precedent and that the Underwriters will be
obligated to purchase all of the shares of Offered Preference if any are
purchased.
    
<TABLE>
<CAPTION>
                                                                      SHARES OF
                                                                       OFFERED
UNDERWRITER                                                           PREFERENCE
- -----------                                                           ----------
<S>                                                                   <C>
PaineWebber Incorporated ............................................ 1,000,000
Merrill Lynch, Pierce, Fenner & Smith
     Incorporated ................................................... 1,000,000
Salomon Brothers Inc ................................................ 1,000,000
                                                                      ---------
                                                                      3,000,000
                                                                      =========
</TABLE>
 
  The Underwriters have advised the Company that they propose initially to
offer shares of the Offered Preference to the public at the public offering
price set forth on the cover page of this Prospectus Supplement, and to certain
dealers at such price less a concession not in excess of $.50 per share. The
Underwriters may allow and such dealers may reallow a discount not in excess of
$.25 per share to certain other dealers. After the initial public offering, the
public offering price, concession and discount may be changed.
 
  The Company has agreed to indemnify the Underwriters against certain
liabilities, including liabilities under the Securities Act of 1933, as
amended, or to contribute with respect to payments which such Underwriters may
be required to make in respect thereof.
 
  Application is being made to list the Offered Preference on the New York
Stock Exchange. Listing will be subject to meeting the requirements of the
Exchange, including those relating to distribution.
 
  Certain of the Underwriters engage or may in the future engage in
transactions with and perform services for the Company and certain of its
affiliates in the ordinary course of business.
 
                                      S-3
<PAGE>
 
 
                          COMMONWEALTH EDISON COMPANY
 
                                DEBT SECURITIES
                          CUMULATIVE PREFERENCE STOCK
 
  Commonwealth Edison Company (the "Company") may offer, from time to time, not
to exceed $880,000,000 aggregate initial offering price of its (i) Debt
Securities (the "Debt Securities"), consisting of First Mortgage Bonds (the
"Bonds"), in one or more series, and Notes (the "Notes"), in one or more
series, and (ii) Cumulative Preference Stock, without par value (the "New
Cumulative Preference Stock"), in one or more series. The Debt Securities and
New Cumulative Preference Stock (together, the "Securities") may be offered
separately or together, in separate series, in amounts, at prices and on terms
to be determined at the time or times of sale. The Bonds will be issued under,
and secured by, a mortgage which constitutes a lien on substantially all of the
properties and franchises of the Company. The Notes will be unsecured, and the
indenture under which they are to be issued contains no limitations on the
issuance by the Company of other indebtedness (whether secured or unsecured).
 
  For each offering of Bonds (the "Offered Bonds") or Notes (the "Offered
Notes") for which this Prospectus is being delivered, there is an accompanying
Prospectus Supplement (the "Prospectus Supplement") that sets forth the
specific designation, aggregate principal amount, maturity or maturities, rate
or rates and times of payment of interest, sinking fund provisions, redemption
terms and any other special terms of the Offered Bonds or the Offered Notes, as
the case may be, and any planned listing thereof on a securities exchange
(although no assurance can be given as to the liquidity of, or the trading
market for, any of the Debt Securities). For each offering of New Cumulative
Preference Stock for which this Prospectus is being delivered (the "Offered
Preference"), there is an accompanying Prospectus Supplement that sets forth
the number of shares, public offering price, dividend rate (or method of
calculation thereof), redemption and sinking fund terms and any other special
terms of the Offered Preference, as well as any planned listing thereof on a
securities exchange (although no assurance can be given as to the liquidity of,
or the trading market for, any shares of the New Cumulative Preference Stock).
See "Recent Rate Proceedings" herein for certain other considerations relating
to an investment in the Securities.
 
  The Company may sell the Securities to or through underwriters or dealers,
directly to other purchasers or through agents. The names of any underwriters,
dealers or agents involved in the distribution of the Offered Bonds, the
Offered Notes or the Offered Preference, as the case may be (the "Offered
Securities"), any applicable discounts, commissions or allowances, any initial
public offering price and the proceeds to the Company from the sale of the
Offered Securities are set forth in the Prospectus Supplement. See "Plan of
Distribution" herein.
 
                               ----------------
 
  THESE SECURITIES HAVE  NOT BEEN  APPROVED OR DISAPPROVED  BY THE  SECURITIES
    AND EXCHANGE COMMISSION OR ANY  STATE SECURITIES COMMISSION NOR HAS  THE
      SECURITIES AND EXCHANGE COMMISSION  OR ANY STATE SECURITIES  COMMIS-
        SION PASSED UPON  THE ACCURACY OR  ADEQUACY OF THIS  PROSPECTUS.
          ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
                               ----------------
 
                 The date of this Prospectus is June 29, 1994.
<PAGE>
 
                                  THE COMPANY
 
  Commonwealth Edison Company (the "Company") is engaged principally in the
production, purchase, transmission, distribution and sale of electricity to a
diverse base of residential, commercial and industrial customers. The Company's
electric service territory has an area of approximately 11,540 square miles and
an estimated population of approximately 8.1 million as of December 31, 1993
and approximately 8.2 million as of December 31, 1992. It includes the city of
Chicago, an area of about 225 square miles with an estimated population of
three million from which the Company derived approximately one-third of its
ultimate consumer revenues in the twelve months ended May 31, 1994. The Company
had approximately 3.3 million electric customers as of May 31, 1994. The
Company's principal executive offices are located at 10 South Dearborn Street,
Post Office Box 767, Chicago, IL 60690-0767, and its telephone number is
312/394-4321.
 
                             AVAILABLE INFORMATION
 
  The Company is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended, and in accordance therewith files reports and
other information with the Securities and Exchange Commission (the
"Commission"). Reports, proxy statements and other information filed by the
Company can be inspected and copied at the public reference facilities
maintained by the Commission at 450 Fifth Street, N.W., Washington, D.C. 20549,
and at its Regional Offices located at Citicorp Center, 500 West Madison
Street, Chicago, IL 60661 and Seven World Trade Center, New York, NY 10048.
Copies of such material can be obtained from the Public Reference Section of
the Commission, Washington, D.C. 20549 at prescribed rates. In addition,
reports, proxy statements and other information concerning the Company may be
inspected at the offices of the New York Stock Exchange, 20 Broad Street, New
York, NY, the Chicago Stock Exchange, 440 South LaSalle Street, Chicago, IL and
the Pacific Stock Exchange, 301 Pine Street, San Francisco, CA, the exchanges
on which certain of the Company's securities are listed. The Company has filed
with the Commission a Registration Statement on Form S-3 under the Securities
Act of 1933, as amended, with respect to the Securities. This Prospectus does
not contain all of the information set forth in such Registration Statement,
certain parts of which are omitted in accordance with the rules and regulations
of the Commission. For further information, reference is made to such
Registration Statement.
 
               INCORPORATION OF CERTAIN INFORMATION BY REFERENCE
 
  The following documents filed by the Company with the Commission (File No. 1-
1839) are incorporated in this Prospectus by reference and made a part hereof:
 
    (a) The Company's Annual Report on Form 10-K for the year ended December
  31, 1993 (the "1993 Form 10-K");
 
    (b) The Company's Quarterly Report on Form 10-Q for the quarterly period
  ended March 31, 1994 (the "March 31, 1994 Form 10-Q"); and
 
    (c) The Company's Current Report on Form 8-K/A-1 dated January 28, 1994
  (the "January 28, 1994 Form 8-K/A-1 Report") and its Current Report on Form
  8-K dated June 24, 1994 (the "June 24, 1994 Form 8-K Report").
 
  All documents subsequently filed by the Company pursuant to Section 13(a),
13(c), 14 or 15(d) of the Securities Exchange Act of 1934, as amended, after
the date of this Prospectus and prior to the termination of the offering or
offerings made by this Prospectus, shall be deemed to be incorporated in this
Prospectus by reference and to be a part hereof from the respective dates of
filing of such documents. Any statement contained in a document incorporated or
deemed to be incorporated by reference in this Prospectus shall be deemed to be
modified or superseded for purposes of this Prospectus to the extent that a
statement contained in this Prospectus or in any other subsequently filed
document which also is or is deemed to be incorporated by reference in this
Prospectus modifies or supersedes such statement. Any statement so modified or
superseded shall not be deemed, except as so modified or superseded, to
constitute a part of this Prospectus.
 
                                       2
<PAGE>
 
  The Company will provide without charge to each person, including any
beneficial owner, to whom this Prospectus is delivered, upon written or oral
request of such person, a copy of any or all of the documents that have been or
may be incorporated in this Prospectus by reference, other than certain
exhibits to such documents. Such requests should be directed to David A.
Scholz, Secretary, Commonwealth Edison Company, 37th Floor, 10 South Dearborn
Street, Post Office Box 767, Chicago, IL 60690-0767 (telephone number 312/394-
3126).
 
                            RECENT RATE PROCEEDINGS
 
  The Company's revenues, net income, cash flows, plant carrying costs, ratios
of earnings to fixed charges and ratios of earnings to fixed charges and
preferred and preference stock dividend requirements have been affected
directly by various rate-related proceedings. These proceedings have related
principally to the rate base treatment of the Company's four most recently
completed nuclear generating units, but have also related to proceedings
concerning the reduction in the difference between the Company's summer and
non-summer residential rates that was effected in the summer of 1988, as well
as fuel reconciliation proceedings conducted by the Illinois Commerce
Commission ("ICC") principally concerning the recoverability of the costs of
the Company's western coal. The uncertainties associated with such proceedings
and issues, among other things, led to the Rate Matters Settlement and the Fuel
Matters Settlement (which are discussed below).
 
  In November 1993, two settlements related to various proceedings and matters
concerning the Company's rates and its fuel adjustment clause became final. One
settlement (the "Rate Matters Settlement"), which became final on November 4,
1993, concerned the proceedings relating to the Company's 1985 and 1991 ICC
rate orders (which orders related principally to the recovery of costs
associated with the Company's four most recently completed nuclear generating
plants, Byron Units 1 and 2 and Braidwood Units 1 and 2), the proceedings
relating to the reduction in the difference between the Company's summer and
non-summer residential rates that was effected in the summer of 1988,
outstanding issues related to the appropriate interest rate and rate design to
be applied to a refund made by the Company during 1990 relating to a December
1988 ICC rate order, and matters related to a rider to the Company's rates that
the Company was required to file as a result of the change in the federal
corporate income tax rate made by the Tax Reform Act of 1986. Effective as of
November 4, 1993, the Company reduced its rates by approximately $339 million
annually and commenced refunding approximately $1.26 billion (including revenue
taxes), plus interest at five percent on the unpaid balance, through
temporarily reduced rates over an initial refund period scheduled to be twelve
months (to be followed by a reconciliation period of no more than five months).
 
  The other settlement (the "Fuel Matters Settlement"), which became final on
November 15, 1993, related to the ICC fuel reconciliation proceedings involving
the Company for the period from 1985 through 1988 and to future challenges by
the settling parties to the prudency of the Company's western coal costs for
the period from 1989 through 1992. Under the Fuel Matters Settlement, effective
as of December 2, 1993, the Company commenced paying approximately $108 million
(including revenue taxes) to its customers through temporarily reduced
collections under its fuel adjustment clause over a twelve-month period.
 
  On February 10, 1994, the Company filed a request with the ICC to increase
electric operating revenues by approximately $460 million, or 7.9%, on an
annual basis above the level of revenues approved in the Rate Matters
Settlement. This request principally reflects the inclusion of Byron Unit 2 and
Braidwood Units 1 and 2 (collectively, the "Units") in the Company's rate base
as fully "used and useful," increased operation and maintenance expenses over
the level reflected in the ICC rate order issued on January 6, 1993 (as
subsequently amended, the "Remand Order"), increased contributions to the
external trust funds which the Company is required to fund to cover the
eventual decommissioning of its nuclear power plants and lower debt and equity
costs. The ICC has suspended the rates, appointed hearing examiners and ordered
an investigation. On June 2, 1994, the ICC Staff submitted their recommendation
that the Company receive a rate increase of approximately $263 million. Under
the Illinois Public Utilities Act, the ICC must decide the case by early
January 1995.
 
  For additional information, including the accounting effects of the foregoing
settlements, see "Summary Information" and Notes A, B and C of Notes to Summary
Information.
 
                                       3
<PAGE>
 
 
                              SUMMARY INFORMATION
 
  The following summary information is qualified in its entirety by the
information appearing elsewhere in this Prospectus and by the information and
financial statements appearing in the documents incorporated in this Prospectus
by reference.
 
 
                                  THE OFFERING
 
<TABLE>
<S>                      <C>
Issue................... Not to exceed $880,000,000 aggregate initial offering
                         price of Securities, consisting of Bonds, Notes and
                         New Cumulative Preference Stock
Terms of Debt
 Securities............. To be determined at time or times of sale
Terms of New Cumulative
 Preference Stock....... To be determined at time or times of sale
Use of Proceeds......... For general corporate purposes of the Company,
                         including to discharge or refund outstanding long-term
                         debt and preference stock of the Company
</TABLE>
 
                          COMMONWEALTH EDISON COMPANY
 
<TABLE>
<S>                                                                 <C>
Estimated Population of Service Area..............................   8,100,000
Customers (as of May 31, 1994)....................................   3,328,686
Sales (thousands of kilowatthours-12 months ended May 31, 1994)...  86,857,638
Net Electric Generating Capability, net of summer limitations
 (kilowatts)......................................................  21,965,000
Fuel Sources of Kilowatthour Generation (12 months ended May 31,
 1994):
 Nuclear..........................................................          71%
 Coal.............................................................          26
 Oil..............................................................           1
 Natural gas......................................................           2
                                                                    ----------
                                                                           100%
                                                                    ==========
</TABLE>
 
                             FINANCIAL INFORMATION
<TABLE>
<CAPTION>
                                                                                                TWELVE MONTHS
                                          YEAR ENDED DECEMBER 31                                    ENDED
                          ------------------------------------------------------------------    MAY 31, 1994
                            1989(B)       1990(B)       1991(B)       1992(B)     1993(A)(B)      (A)(B)(C)
                          ----------    ----------    ----------    ----------    ----------    -------------
<S>                       <C>           <C>           <C>           <C>           <C>           <C>
Electric Operating
 Revenues (thousands of
 dollars)(1)............  $5,819,499(2) $5,310,819(2) $6,275,533(2) $6,026,321(2) $5,260,440(3)  $5,278,206(3)
Net Income (thousands of
 dollars)...............  $  693,683    $  128,291    $   94,887    $  513,981    $  112,440(4)  $   20,203
Net Income on Common
 Stock (thousands of
 dollars)...............  $  598,503    $   45,796    $   16,599    $  443,442    $   46,388(4)  $  (43,878)
Earnings per Common
 Share..................  $     2.83    $     0.22    $     0.08    $     2.08    $     0.22(4)  $    (0.21)
Ratios of Earnings to--
 Fixed Charges (D)......        2.49          1.42          1.59          2.06          1.19           1.01
 Fixed Charges and
  Preferred and
  Preference Stock
  Dividend Requirements
  (D)...................        2.06          1.21          1.36          1.78          1.03            .88(E)
</TABLE>
- --------
See Notes (A) through (E) on pages 5 through 8.
(1) For the years 1989 and 1990, electric operating revenues have been
    increased to reflect the reclassification of interchange sales which were
    previously recorded net with purchased power.
(2) Reflects provisions for revenue refunds of $18.4 million for the year ended
    December 31, 1992, $0.9 million for the year ended December 31, 1991 and
    $536.4 million for the year ended December 31, 1990, relating in each case
    to the Illinois Supreme Court's ("Supreme Court") reversal of the ICC's
    December 1988 rate order and the Supreme Court's decision regarding Byron
    Unit 1. During 1989, the Company recorded provisions for revenue refunds of
    $31.8 million with respect to the Byron Unit 1 remand proceedings and the
    summer/non-summer rate differential matter.
(3) Reflects provisions for revenue refunds of $1,281 million for the year
    ended December 31, 1993 and $1,168 million for the twelve months ended May
    31, 1994, recording the effects of the Rate Matters Settlement and the Fuel
    Matters Settlement, as discussed below in Note A on page 5 of this
    Prospectus.
(4) In January 1993, the Company adopted an accounting standard which requires
    an asset and liability approach for financial accounting and reporting for
    income taxes as opposed to the deferred method that the Company had
    previously used. The Company adopted the standard as a cumulative effect of
    a change in an accounting principle, which increased net income and net
    income on common stock for the year ended December 31, 1993 by $9.7
    million, or $0.05 per common share.
 
                                       4
<PAGE>
 
NOTES TO SUMMARY INFORMATION:
 
(A) In November 1993, two settlements related to various proceedings and
    matters concerning the Company's rates and its fuel adjustment clause
    became final. The Rate Matters Settlement, which became final on November
    4, 1993, concerned the proceedings relating to the Company's 1985 and 1991
    ICC rate orders (which orders relate to, among other things, the recovery
    of costs associated with the Company's four most recently completed nuclear
    generating units, Byron Units 1 and 2 and Braidwood Units 1 and 2), the
    proceedings relating to the reduction in the difference between the
    Company's summer and non-summer residential rates that was effected in the
    summer of 1988, outstanding issues relating to the appropriate interest
    rate and rate design to be applied to a refund made by the Company during
    1990 relating to a December 1988 ICC rate order, and matters related to a
    rider to the Company's rates that the Company was required to file as a
    result of the change in the federal corporate income tax rate made by the
    Tax Reform Act of 1986. The Fuel Matters Settlement, which became final on
    November 15, 1993, related to the ICC fuel reconciliation proceedings
    involving the Company for the period from 1985 through 1988 and to future
    challenges by the settling parties to the prudency of the Company's western
    coal costs for the period from 1989 through 1992.
 
    Under the Rate Matters Settlement, effective as of November 4, 1993, the
    Company reduced its rates by approximately $339 million annually and
    commenced refunding approximately $1.26 billion (including revenue taxes),
    plus interest at five percent on the unpaid balance, through temporarily
    reduced rates over an initial refund period scheduled to be twelve months
    (to be followed by a reconciliation period of no more than five months). The
    Company had previously deferred the recognition of revenues during 1993, as
    a result of developments in the proceedings related to the March 1991 ICC
    rate order, which resulted in a reduction to 1993 net income of
    approximately $160 million. The recording of the effects of the Rate Matters
    Settlement in October 1993 reduced the Company's 1993 net income and
    retained earnings by approximately $292 million or $1.37 per common share,
    in addition to the approximately $160 million effect of the deferred
    recognition of revenues and after the partially offsetting effect of
    recording approximately $269 million (or $1.26 per common share) in deferred
    carrying charges, net of income taxes, authorized in the Remand Order. The
    deferred recognition of revenues was eliminated in October 1993 at the time
    the provisions for revenue refunds related to the Rate Matters Settlement,
    which reflected those deferred revenues, were recorded. Consistent with such
    treatment of the deferred recognition of revenues in 1993, the financial
    statements presented herein for the twelve months ended May 31, 1994 reflect
    the reclassification of the deferred recognition of revenues from operating
    revenues to provisions for revenue refunds. This reclassification had no
    effect on net electric operating revenues. In January 1994, a purported
    class action was filed in the Circuit Court of Cook County, Illinois
    (Circuit Court) challenging the method in which the refunds are being made
    to residential customers in the Rate Matters Settlement. The Company does
    not believe that the action has any merit.
    
    Under the Fuel Matters Settlement, effective as of December 2, 1993, the
    Company commenced paying approximately $108 million (including revenue
    taxes) to its customers through temporarily reduced collections under its
    fuel adjustment clause over a twelve-month period. The Company recorded the
    effects of the Fuel Matters Settlement in October 1993, which effects
    reduced the Company's 1993 net income and retained earnings by
    approximately $62 million or $0.29 per common share.
 
    For additional information regarding the proceedings and matters settled,
    see Note B below.
 
(B) The Company's revenues, net income, cash flows, plant carrying costs,
    ratios of earnings to fixed charges and ratios of earnings to fixed charges
    and preferred and preference stock dividend requirements have been affected
    directly by various rate-related proceedings. During the periods presented
    under the subcaption "Financial Information" in "Summary Information," the
    Company
 
                                       5
<PAGE>
 
    was involved in proceedings concerning its October 1985 ICC rate order
    (which related principally to the recovery of costs associated with its
    Byron Unit 1 nuclear generating unit), proceedings concerning its March 1991
    ICC rate order (which related principally to the recovery of costs
    associated with the Units), proceedings concerning the reduction in the
    difference between the Company's summer and non-summer residential rates
    that was effected in the summer of 1988, and ICC fuel reconciliation
    proceedings principally concerning the recoverability of the costs of the
    Company's western coal. In addition, there were outstanding issues related
    to the appropriate interest rate and rate design to be applied to a refund
    that was made in 1990 following the reversal of a December 1988 ICC rate
    order and a rider to the Company's rates that the Company was required to
    file as a result of the change in the federal corporate income tax rate made
    by the Tax Reform Act of 1986. The uncertainties associated with such
    proceedings and issues, among other things, led to the Rate Matters
    Settlement and the Fuel Matters Settlement. See Note A for additional
    information.

    The proceedings following the Company's 1985 ICC rate order resulted in
    additional plant cost disallowances related to Byron Unit 1 (approximately
    $200 million) and associated refunds and interest (approximately $163
    million), the income effects of which were largely recorded in October 1989
    ($62 million or $0.29 per common share) and the second quarter of 1990 ($208
    million or $0.98 per common share). An April 1992 Supreme Court order, which
    resolved certain jurisdictional and interest rate issues, resulted in
    additional provisions for refunds with interest and revenue taxes and
    additional interest aggregating approximately $73 million (which reduced net
    income by approximately $50 million or $0.24 per common share) during 1992.
    Prior to the Rate Matters Settlement, an open issue in these proceedings was
    the amount of refunds, if any, that the Company owed for the period from
    January 1, 1989 through March 19, 1991, as a result of the previously
    recorded plant cost disallowances. Although the Company had received a
    favorable ICC order, which was issued on June 2, 1993, there was no
    assurance that the order would be upheld on appeal.
 
    The proceedings following the Company's 1991 ICC rate order resulted in
    plant cost disallowances related to the Units and a suspension of the second
    and third steps of the scheduled three-step rate increase (the first step
    rate increase of $483 million was allowed to go into effect). The
    disallowances, aggregating approximately $734 million, were recorded in
    March and November 1991 and reduced net income by an aggregate of
    approximately $551 million or $2.59 per common share. Following a Supreme
    Court remand of the 1991 order to the ICC, the ICC issued the Remand Order
    determining that the then effective $483 million rate increase under the
    1991 order should be reduced by approximately $339 million to $144 million
    and ordering the Company to make refunds to its customers over a six-month
    period commencing February 15, 1993. On January 21, 1993, the Supreme Court
    granted the Company's request for a stay of the effectiveness of the Remand
    Order pending administrative and judicial review. Applications for rehearing
    were denied by the ICC, and appeals were filed with the Illinois Appellate
    Court ("Appellate Court"), which were pending until the Rate Matters
    Settlement was finalized.
    
    The proceedings related to the reduction in the differential between the
    Company's summer and non-summer residential rates stem from two orders
    entered by the ICC in April and June 1988. Both orders were intended to
    reduce the differential without affecting the Company's overall revenues
    provided under the then effective rates set forth in the Company's October
    1985 ICC rate order. The Company billed under the rates allowed under the
    June order. Those billings resulted in revenues through year-end 1988
    approximately $150 million greater than would have been billed under the
    specific charges set forth in the April order and approximately $5.7 million
    over what would have been billed under the October 1985 rate order. As a
    result of the proceedings that followed, the Company refunded $5.7 million
    (in its May 1990 billing cycle); however, various intervenors continued to
    seek additional refunds. The matter was pending before the Appellate Court
    prior to the finalization of the Rate Matters Settlement.
                                           6
<PAGE>
 
    The Illinois Public Utilities Act requires the ICC to hold annual public
    hearings to determine whether each utility's fuel adjustment clause reflects
    actual costs of fuel and power prudently purchased and to reconcile amounts
    collected with actual costs. Through its fuel adjustment clause, the Company
    recovers from its customers the cost of the fuel used to generate
    electricity and of purchased power as compared to fuel costs included in
    base rates.
    
    The Company is currently involved in proceedings relating to the amounts
    collected under its fuel adjustment clause with respect to 1989 through
    1992. Under the Fuel Matters Settlement, parties to the settlement have
    agreed not to challenge the prudency of the Company's western coal costs for
    the period from 1989 through 1992. The Company's western coal contracts and
    its rail contracts for delivery of the western coal were renegotiated during
    1992 effective as of January 1, 1993, to provide, among other things, for
    significant reductions in the delivered price of the coal over the duration
    of the contracts. However, the renegotiated contracts provide for the
    purchase of certain coal at prices substantially above currently prevailing
    market prices and the Company has significant purchase commitments under its
    contracts. For additional information relating to the Company's commitments
    for the purchase of coal under long-term contracts, see "Management's
    Discussion and Analysis of Financial Condition and Results of Operations,"
    subcaption "Liquidity and Capital Resources," and Notes 1 and 19 of Notes to
    Financial Statements in the March 31, 1994 Form 10-Q.
    
(C) On February 10, 1994, the Company filed a request with the ICC to increase
    electric operating revenues by approximately $460 million, or 7.9%, on an
    annual basis above the level of revenues approved in the Rate Matters
    Settlement. This request principally reflects the inclusion of the Units in
    the Company's rate base as fully "used and useful," increased operation and
    maintenance expenses over the level reflected in the Remand Order,
    increased contributions to the external trust funds which the Company is
    required to fund to cover the eventual decommissioning of its nuclear power
    plants and lower debt and equity costs. The ICC has suspended the rates,
    appointed hearing examiners and ordered an investigation. On June 2, 1994,
    the ICC Staff submitted their recommendation that the Company receive a
    rate increase of approximately $263 million (of which approximately $43
    million is for increased contributions to the external decommissioning
    trust funds). Under the Illinois Public Utilities Act, the ICC must decide
    the case by early January 1995.
 
    In the Remand Order, the rate determination was based upon, among other
    things, findings by the ICC with respect to the extent to which the Units
    were "used and useful" during the 1991 test year period of the rate order.
    With respect to the "used and useful" issue, the ICC applied a needs and
    economic benefits methodology, using a twenty percent reserve margin and
    forecasted peak demand, and found Byron Unit 2 and Braidwood Units 1 and 2
    to be 93%, 21% and 0%, respectively, "used and useful." The Company has not
    recorded any disallowances related to the "used and useful" issue. The
    Company considers the "used and useful" disallowance in the Remand Order to
    be temporary. The ICC concluded in the Remand Order that the forecasts in
    the record in that proceeding indicate that Braidwood Units 1 and 2 will be
    fully "used and useful" within the reasonably foreseeable future.
    
(D) For purposes of computing the ratios of earnings to fixed charges and the
    ratios of earnings to fixed charges and preferred and preference stock
    dividend requirements: (i) earnings consist of net income before deducting
    net provisions for income taxes (including deferred taxes and current
    income taxes applicable to nonoperating activities), investment tax credits
    deferred and fixed charges; (ii) fixed charges consist of interest on debt,
    amortization of debt discount, premium and expense, and the estimated
    interest component of nuclear fuel and other lease payments and rentals;
    and (iii) preferred and preference stock dividend requirements represent an
    amount equal to income, before income taxes, which would be required to
    meet the dividends on preferred and preference stocks. For additional
    information, see "Management's Discussion and Analysis of Financial
    Condition and Results of Operations" in the March 31, 1994 Form 10-Q.
 
(E) The ratio of earnings to fixed charges and preferred and preference stock
    dividend requirements for the twelve months ended May 31, 1994 indicates
    that earnings are inadequate to cover fixed
 
                                       7
<PAGE>
 
   charges and preferred and preference stock dividend requirements and the
   coverage deficiency is approximately $97 million.
 
                                USE OF PROCEEDS
 
  The proceeds from the sale of Securities offered hereby will be used for
general corporate purposes, including to discharge or refund (by redemption or
by purchase on the open market, in private transactions, by tender offer or
otherwise) outstanding long-term debt and preference stock of the Company, to
finance the Company's ongoing capital improvement program, nuclear fuel
expenditures and contributions to nuclear decommissioning trusts, and to
supplement working capital. Long-term debt and preference stock to be
discharged or refunded is expected to consist of maturing debt and/or sinking
fund installments on outstanding preference stock and, should market conditions
and the terms of the related debt instrument or preference stock permit, debt
and/or preference stock to be refinanced with debt and/or preference stock
bearing lower interest or dividend rates. For information concerning the
Company's outstanding long-term debt and preference stock, see Statements of
Consolidated Capitalization in the March 31, 1994 Form 10-Q.
 
                              DESCRIPTION OF BONDS
 
GENERAL.
 
  The Bonds will be issued under the Company's Mortgage dated July 1, 1923, as
amended and supplemented, and as to be further supplemented by one or more
Supplemental Indentures creating the respective series in which the Bonds are
to be issued. Continental Bank, National Association (the "Trustee") and M. J.
Kruger are the Trustees under such Mortgage, as amended and supplemented, and
Supplemental Indentures thereto (collectively hereinafter called the
"Mortgage"), copies of which are filed as exhibits to the Registration
Statement. The Mortgage provides generally for the issuance of first mortgage
bonds in series.
 
  The following statements are brief summaries of certain of the provisions of
the Mortgage and reference is made to the aforementioned exhibits for a more
complete statement of such provisions. The terms "lien of the Mortgage,"
"mortgage date of acquisition," "permitted lien," "prior lien," "prior lien
bonds," "property additions" and "utilized under the Mortgage" are hereinafter
used with the meanings ascribed to such terms, respectively, by the Mortgage.
(Sections 1.27, 1.28, 1.39, 1.40, 1.41, 1.42 and 1.58) The Mortgage contains
provisions under which substantially all of the properties of the Company's
electric utility subsidiary, Commonwealth Edison Company of Indiana, Inc. (the
"Indiana Company"), might be subjected to the lien of the Mortgage if the
Company should so determine, as additional security for the Company's bonds,
whereupon such subsidiary would become a "mortgaged subsidiary," as defined in
the Mortgage. (Section 1.31) Since the Company has not as yet made any
determination as to causing the Indiana Company to become a mortgaged
subsidiary, those provisions of the Mortgage, hereinafter summarized, which
relate to a mortgaged subsidiary as well as to the Company, are stated as
though they relate to the Company only.
 
  The Bonds will be issued only in fully registered certificated or book-entry
form, without coupons, in the denomination of $1,000 or any authorized multiple
of $1,000. It is expected that the Bonds will be delivered initially in
definitive form. The Company reserves the right, however, to make initial
delivery of the Bonds in temporary form. No service charge will be made for any
transfer or exchange of any Bonds, except, in the case of transfer, a charge
sufficient to reimburse the Company for any stamp or other tax or governmental
charge required to be paid will be made.
 
  Principal of the Bonds and interest thereon will be payable in Chicago or in
New York City, except as may otherwise be set forth in the applicable
Prospectus Supplement. Interest on each registered Bond issued in certificated
form (with limited exceptions as provided in the Mortgage) will be paid to the
person in whose name such Bond is registered at the close of business on the
applicable record date specified in the Bond. Payment of interest on Bonds
issued in book-entry form will be made to The Depository Trust Company, New
York, New York, or its nominee.
 
                                       8
<PAGE>
 
  Any terms of the Bonds which are not summarized herein will be described in
the applicable Prospectus Supplement.
 
REDEMPTION PROVISIONS.
 
  Any applicable redemption provisions of the Bonds will be fixed for each
series of Bonds at the time of sale of any such series.
 
SECURITY.
 
  The Bonds will rank equally and ratably with all bonds, irrespective of
series, now outstanding or hereafter issued under the Mortgage. The Mortgage
constitutes a direct first mortgage lien on substantially all property and
franchises (other than expressly excepted property) now owned by the Company,
subject only to permitted liens. All property and franchises (other than
expressly excepted property and property which may be acquired by the Company
subsequent to the filing of a bankruptcy proceeding with respect to the Company
under the Bankruptcy Reform Act of 1978) hereafter acquired by the Company will
become subject to the lien of the Mortgage, subject only to permitted liens and
liens, if any, existing or placed on such after-acquired property at the time
of acquisition thereof.
 
  There are expressly excepted from the lien of the Mortgage, whether now owned
or hereafter acquired, certain real estate not used in the public utility
business, real estate held by the Company in the name of a nominee, cash and
securities not specifically pledged under the Mortgage, receivables, contracts
(other than leases), materials and supplies not included in utility plant
accounts, merchandise, automobiles, trucks and other transportation equipment
and office furniture and equipment. (Divisions A and B of the Supplemental
Indenture dated August 1, 1944)
 
ISSUANCE OF ADDITIONAL BONDS.
 
  The Mortgage provides that no bonds may be issued which, as to security, will
rank ahead of the Bonds, but, as hereinafter indicated, the Company may,
subject to certain limitations, acquire property subject to prior liens.
 
  The aggregate principal amount of other bonds which may be issued under the
Mortgage and which as to security will rank equally with the Bonds is not
limited except as indicated below. Additional bonds of any series may be
issued, subject to the provisions of the Mortgage, in a principal amount equal
to (a) 66 2/3% of net property additions not previously utilized under the
Mortgage, (b) the amount of cash deposited with the Trustee as the basis for
the issuance of such bonds and (c) the amount of bondable bond retirements not
previously utilized under the Mortgage; provided, however, that no such bonds
in any event may be issued under (a) or (b), or under (c) if the bonds to be
issued bear a higher rate of interest than that borne by the bonds retired or
being retired (except in case such bonds retired or being retired mature within
two years), unless the net earnings of the Company for a twelve-month period
within the immediately preceding fifteen-month period shall have been equal to
at least two and one-half times the annual interest on all bonds then
outstanding under the Mortgage, including the bonds then applied for but not
including any bonds then being retired, and on all prior lien bonds then
outstanding but not including any prior lien bonds then being retired. For
purposes of such net earnings test, revenues include amounts billed subject to
refund including such amounts collected pursuant to the rate proceedings
discussed in Note B. The net earnings calculation under the Mortgage is not
affected by certain accounting write-offs related to plant costs. (For
additional information, see Note B on pages 5 through 7 of this Prospectus.)
(Sections 4.02, 4.03, 4.04, 1.32 and 1.33)
 
  The Mortgage provides that cash deposited with the Trustee as a basis for the
issuance of bonds shall be (a) paid over to the Company in an amount, certified
to the Trustee, equal to 66 2/3% of the amount of net property additions not
previously utilized under the Mortgage, or in an amount equal to
 
                                       9
<PAGE>
 
the amount of bondable bond retirements not previously utilized under the
Mortgage, or both, or (b) applied to the purchase or redemption of bonds.
(Section 9.02)
 
  At April 30, 1994, the amount of net property additions, including nuclear
fuel, not previously utilized under the Mortgage was approximately $1,036
million (of which approximately $809 million was available to be utilized for
the issuance of additional bonds subject to compliance with other provisions),
and the amount of bondable bond retirements not previously utilized under the
Mortgage was approximately $3,231 million. Bonds covered by this Prospectus
will be issued on the basis of net property additions unless otherwise stated
in the applicable Prospectus Supplement.
 
  "Bondable bond retirements" means an amount equal to the principal amount of
bonds retired by application of funds deposited with the Trustee or by
surrender of bonds to the Trustee for cancellation, whether or not such deposit
of funds or surrender of bonds is pursuant to a sinking fund or purchase fund.
(Section 1.10)
 
  "Net earnings" means the earnings of the Company as defined in the Mortgage
after deducting all charges except: (a) charges for the amortization, write-
down or write-off of acquisition adjustments or intangibles; (b) property
losses charged to operations; (c) provisions for income and excess or other
profits taxes imposed on income after the deduction of interest charges, or
charges made in lieu of such taxes; (d) interest charges; and (e) amortization
of debt and stock discount and expense or premium. Any net profit or net loss
from merchandising and jobbing is to be deducted from operating expenses or
added to operating expenses, as the case may be. Net non-operating income from
property and securities not subject to the lien of the Mortgage may be included
in revenues but only to the extent of not more than 10% of the total of such
net earnings. No profits or losses on the disposition of property or securities
or on the reacquisition of securities shall be included in net earnings. The
net earnings calculation under the Mortgage is not affected by certain
accounting write-offs related to plant costs. (Section 1.32)
 
  "Net property additions" means the amount of $50 million, plus the cost or
fair value as of the mortgage date of acquisition thereof, whichever is less,
of property additions, less all "current provisions for depreciation" made by
the Company after December 31, 1944, after deducting from such current
provisions for depreciation the amount of the "renewal fund requirement," if
any, for the year 1945 and each subsequent year. (Section 1.44)
 
  "Current provisions for depreciation" for any period means the greater of:
 
    (a) the total of the amounts appropriated by the Company for depreciation
  during such period on all property of the character of property additions
  not subject to a prior lien, increased or decreased, as the case may be, by
  net salvage for such period, such amounts not to include, however,
  provisions for depreciation charged to surplus, charges to income or
  surplus for the amortization, write-down or write-off of acquisition
  adjustments or intangibles, property losses charged to operations or
  surplus, or charges to income in lieu of income and excess or other profits
  taxes; and
 
    (b) an amount equal to one-twelfth of 2% for each calendar month of such
  period (or such lesser percentage as may, at stated intervals, be certified
  by an independent engineer as adequate) of the original cost, as of the
  beginning of such month, of all depreciable property of the character of
  property additions not subject to a prior lien. (Section 1.18)
 
  Except as set forth above, the Mortgage does not limit the amount of
additional bonds which can be issued; and it does not contain any restrictions
on the issuance of unsecured indebtedness, such as the Notes. In addition, the
Mortgage does not prohibit a merger or sale of substantially all of the
Company's assets or a comparable transaction, unless the lien of the Mortgage
is impaired, and does not address the effect on bondholders of a highly
leveraged transaction.
 
                                       10
<PAGE>
 
RENEWAL FUND REQUIREMENT.
 
  The Company covenants that it will, for each year, pay or cause to be paid to
the Trustee an amount of cash, as and for a renewal fund, equal to the excess,
if any, of current provisions for depreciation for such year over the cost or
fair value as of the mortgage date of acquisition thereof, whichever is less,
of property additions for such year, such amount, which will be the renewal
fund requirement for such year, to be subject to reduction by an amount equal
to the amount, certified to the Trustee, of net property additions or bondable
bond retirements, or both, not previously utilized under the Mortgage.
(Sections 6.01 and 6.02) There was no renewal fund requirement for any of the
years 1945 through 1988, 1991 or 1992, although there was a $140.7 million
requirement for 1989, a $1 million requirement for 1990 and a $50.9 million
requirement for 1993. In 1989, 1990 and 1993, the renewal fund requirement was
satisfied by certifying an equivalent amount of net property additions.
 
ACQUISITION OF PROPERTY SUBJECT TO PRIOR LIENS.
 
  The Company covenants that it will not acquire any property subject to a
prior lien if the principal amount of prior lien bonds outstanding thereunder
and under other prior liens upon such prior lien property exceeds 66 2/3% of
the fair value of such part of such property as shall consist of property of
the character of property additions, nor unless the net earnings of such
property for a twelve-month period within the immediately preceding fifteen-
month period shall have been at least two and one-half times the annual
interest on all prior lien bonds secured by prior liens on such property. The
Company also covenants that it will not transfer all or substantially all its
property to any other corporation, the property of which is subject to a prior
lien, unless the property of such other corporation could be acquired by the
Company under the provisions of such covenant with respect to the acquisition
of property subject to a prior lien. (Section 7.15)
 
  The Company covenants that it will not issue additional prior lien bonds
under any prior lien, and that as soon as all prior lien bonds shall cease to
be outstanding under any prior lien, the Company will promptly procure or cause
to be procured the cancellation and discharge of such prior lien. The Company
further covenants that upon the discharge of a prior lien it will cause any
cash on deposit with the prior lien trustee (other than cash deposited for the
payment or redemption of outstanding prior lien bonds) to be deposited with the
Trustee, except to the extent required to be deposited with the trustee under
another prior lien. (Section 7.16)
 
MODIFICATION OF MORTGAGE.
 
  In general, modifications or alterations of the Mortgage and of the rights
and obligations of the Company and of the bondholders, and waivers of
compliance with the Mortgage, may, with the approval of the Company, be made at
a meeting of bondholders upon the affirmative vote of 80% of the bonds entitled
to vote at the meeting with respect to the matter involved, but no such
modifications or alterations or waivers of compliance shall be made which will
permit the extension of the time or times of payment of the principal of or the
interest or the premium, if any, on any bonds, or the reduction in the
principal amount thereof or in the rate of interest or the amount of any
premium thereon, or any other modification in the terms of payment of such
principal, interest or premium, which terms of payment are unconditional, or,
otherwise than as permitted by the Mortgage, the creation of any lien ranking
prior to or on a parity with the lien of the Mortgage with respect to any of
the mortgaged property, all as more fully provided in the Mortgage. (Section
17.07)
 
CONCERNING THE TRUSTEES.
 
  The Trustee, Continental Bank, provides general banking services, including
those as a depository, for the Company and certain of its subsidiaries. The
Trustee also has a commitment of $60 million in the Company's lines of credit.
 
  M. J. Kruger, Co-Trustee under the Mortgage, is an officer of the Trustee.
 
                                       11
<PAGE>
 
RIGHTS UPON DEFAULT.
 
  The Mortgage provides that in case any one or more of certain specified
events (defined as "completed defaults") shall occur and be continuing, the
Trustee or the holders of not less than 25% in principal amount of the bonds
may declare the principal of all bonds, if not already due, together with all
accrued and unpaid interest thereon, to be immediately due and payable. The
Trustee, upon request of the holders of a majority in principal amount of the
outstanding bonds, shall waive such default and rescind any such declaration if
such default is cured. (Sections 11.02 and 11.21)
 
  The Mortgage further provides that upon the occurrence of one or more
completed defaults, the Trustees may proceed by such suits at law or in equity
to foreclose the lien of the Mortgage or to enforce any other appropriate
remedy as the Trustees, being advised by counsel, shall determine. (Section
11.05)
 
  Bondholders have no right to enforce any remedy under the Mortgage unless the
Trustees have first had a reasonable opportunity to do so following notice of
default to the Trustee and request by the holders of not less than 25% in
principal amount of the bonds for action by the Trustees with offer of
indemnity satisfactory to the Trustees against costs, expenses and liabilities
that may be incurred thereby, but such provision does not impair the absolute
right of any bondholder to enforce payment of the principal of and interest on
such bondholder's bonds when due. (Section 11.20)
 
DEFAULT AND NOTICE THEREOF TO BONDHOLDERS.
 
  The Mortgage provides that the following shall constitute completed defaults:
 
    (a) default shall be made in the payment of any installment of interest
  on any of the bonds when due and such default shall continue for 60 days;
 
    (b) default shall be made in the payment of the principal of any of the
  bonds when due, whether at maturity or by declaration or otherwise;
 
    (c) default shall be made in the payment of any installment of interest
  on any prior lien bonds when due, and such default shall continue for 30
  days after written notice given to the Company (following the expiration of
  the period of grace, if any, specified in the prior lien securing such
  prior lien bonds) by the Trustee or to the Company and the Trustee by the
  holders of not less than 5% in principal amount of the bonds;
 
    (d) default shall be made in the payment of the principal of any prior
  lien bonds when due, whether at maturity or by declaration or otherwise,
  and such default shall continue for 30 days after written notice to the
  Company by the Trustee or to the Company and the Trustee by the holders of
  not less than 5% in principal amount of the bonds;
 
    (e) bankruptcy, receivership or similar proceedings shall be initiated by
  the Company; or any judgment entered in such proceedings initiated against
  the Company shall not have been vacated, set aside or stayed within 45 days
  after the entry thereof; and
 
    (f) default shall be made in the observance or performance of any other
  of the covenants, conditions or agreements on the part of the Company
  contained in the Mortgage or in the bonds or in any prior lien or prior
  lien bonds, and such default shall continue for 90 days after written
  notice to the Company by the Trustee or to the Company and the Trustee by
  the holders of not less than 25% in principal amount of the bonds.
 
  Within 90 days after the occurrence of any default which is known to the
Trustees, the Trustees shall give to the bondholders notice of such default
unless it shall have been cured; except that, in case of defaults in the
payment of principal of or interest on the bonds, or in the payment of any
sinking fund or purchase fund installment, the Trustees may withhold such
notice if and so long as the board
 
                                       12
<PAGE>
 
of directors, the executive committee, or a trust committee of directors or
responsible officers of the Trustee, or any one or more of them, shall in good
faith determine that the withholding of such notice is in the interests of the
bondholders and the Co-Trustee shall in good faith determine that the
withholding of such notice is in the interests of the bondholders. (Sections
11.02 and 15.03)
 
CERTIFICATES AND OPINIONS.
 
  Officers' certificates evidencing compliance with the covenants in the
Mortgage relating to the payment of taxes and the maintenance of insurance on
properties of the Company subject to the lien of the Mortgage must be filed as
exhibits to the certificate of the Company filed annually with the Trustee.
(Sections 2.01, 7.09 and 7.10(c)) In connection with the taking of various
actions by the Trustees or the Trustee upon application of the Company,
including the authentication and delivery of additional bonds (Article IV), the
release of property (Section 8.03), the reduction or withdrawal of cash
(Section 8.04) and other matters, the Mortgage requires that the Company
furnish to the Trustee orders, requests, resolutions, certificates of officers,
engineers, accountants and appraisers, and opinions of counsel and other
documents, the particular documents to be furnished in each case being
dependent upon the nature of the application.
 
                              DESCRIPTION OF NOTES
 
GENERAL.
 
  The Notes will be issued under the Company's Indenture dated as of September
1, 1987, as amended and supplemented, and as to be further supplemented by one
or more Supplemental Indentures creating the respective series in which the
Notes are to be issued. Citibank, N.A., is the Trustee (the "Indenture
Trustee") under the Indenture and the Supplemental Indentures thereto
(collectively hereinafter called the "Indenture"), copies of which are filed as
exhibits to the Registration Statement. The Indenture provides generally for
the issuance of notes in series. The following statements are brief summaries
of the provisions of the Indenture and reference is made to such exhibits for a
more complete statement of such provisions.
 
  The Notes will be issued only in fully registered certificated or book-entry
form (unless otherwise indicated in the Prospectus Supplement with respect to
any particular series of Notes) in the denomination of $1,000 or any authorized
multiple of $1,000. It is expected that the Notes will be delivered initially
in definitive form. The Company reserves the right, however, to make initial
delivery of the Notes in temporary form. No service charge will be made for any
transfer or exchange of any Notes, except the Company may require payment of a
sum sufficient to cover any tax or other governmental charge in connection
therewith.
 
  Principal of the Notes and interest thereon will be payable in New York City,
except as may otherwise be set forth in the applicable Prospectus Supplement.
Interest on each registered Note issued in certificated form (with limited
exceptions as provided in the Indenture) will be paid to the person in whose
name such Note is registered at the close of business on the applicable record
date specified in the Note. Payment of interest on Notes issued in book-entry
form will be made to The Depository Trust Company, New York, New York, or its
nominee.
 
  The Notes will be unsecured and will rank equally with the Company's
outstanding unsecured indebtedness. Substantially all of the properties and
franchises of the Company are subject to the lien of the Mortgage under which
the Company's first mortgage bonds are outstanding. (See "Description of
Bonds," subcaption "Security," herein.)
 
  Any terms of the Notes which are not summarized herein will be described in
the applicable Prospectus Supplement.
 
                                       13
<PAGE>
 
SINKING FUND AND REDEMPTION PROVISIONS.
 
  Any applicable sinking fund and redemption provisions of the Notes will be
fixed for each series of Notes at the time of sale of any such series.
 
ISSUANCE OF ADDITIONAL SECURITIES.
 
  The Indenture does not limit the aggregate principal amount of notes which
may be issued thereunder. There are notes presently outstanding under the
Indenture. Neither the Indenture nor any of the other indentures under which
the Company's several series of debentures are outstanding contains any
limitation on the issuance by the Company of other securities either secured or
unsecured. In addition, the Indenture does not address the effect on
noteholders of a highly leveraged transaction.
 
  In addition to the bonds now outstanding under the Company's Mortgage, bonds
of any series may hereafter be issued under the Mortgage, subject to certain
net earnings and other requirements. (See "Description of Bonds," subcaption
"Issuance of Additional Bonds," herein.)
 
MODIFICATION OF INDENTURE.
 
  The Indenture provides that with the consent of the holders of a majority in
principal amount of the notes at the time outstanding under the Indenture, of
all series which are affected (or without such consent in the case of
amendments or modifications that do not affect the rights of any noteholder),
the Company and the Indenture Trustee may enter into supplemental indentures
for the purpose of amending or modifying, in any manner, the provisions of the
Indenture or of any supplemental indenture, provided that no such supplemental
indenture shall, without the consent of the holder of each outstanding note
affected thereby, among other things, (i) change the stated maturity of the
principal of, or any installment of interest on, any note, or reduce the
principal amount thereof or the interest thereon or any premium payable upon
the redemption thereof, or (ii) reduce the percentage in principal amount of
the outstanding notes, the consent of whose holders is required for any such
supplemental indenture. (Sections 11.01 and 11.02)
 
CONCERNING THE INDENTURE TRUSTEE.
 
  The Indenture Trustee, Citibank, N.A., provides general banking services,
including those as a depository, for the Company. The Indenture Trustee also
has a commitment of $95 million in the Company's lines of credit and has issued
a letter of credit in the amount of $20 million on behalf of the Company.
 
EVENTS OF DEFAULT AND RIGHTS UPON DEFAULT.
 
  The Indenture provides that the following constitute "Events of Default" with
respect to the notes of any series:
 
    (a) default in the payment of any interest upon any note of that series
  when it becomes due and payable, and continuance of such default for a
  period of 60 days;
 
    (b) default in the payment of the principal of (or premium, if any, on)
  any note of that series at its maturity;
 
    (c) default in the deposit of any installment of any sinking fund or
  similar payment with respect to notes of that series when and as payable,
  and continuance of such default for a period of 60 days;
 
    (d) the entry of a decree or order in bankruptcy, receivership or similar
  proceedings initiated against the Company, and the continuance of any such
  decree or order for a period of 45 consecutive days;
 
                                       14
<PAGE>
 
    (e) the institution by the Company of, or the consent by the Company to
  the institution of, bankruptcy, insolvency or similar proceedings against
  the Company; and
 
    (f) default in the performance, or breach, of any other covenant or
  warranty of the Company in the Indenture, and continuance of such default
  or breach for a period of 90 days after notice to the Company by the
  Indenture Trustee or to the Company and the Indenture Trustee by the
  holders of at least 25% in principal amount of the outstanding notes of
  that series. (Section 7.01)
 
  The Indenture provides that within 90 days after the occurrence of any
default which is known to the Indenture Trustee, the Indenture Trustee shall
give to the noteholders notice of such default, unless such default shall have
been cured or waived; provided that, except in the case of a default in the
payment of the principal of (or premium, if any) or interest on any note of
such series or in the payment of any sinking or purchase fund installment, the
Indenture Trustee may withhold such notice if and so long as the board of
directors, the executive committee, or a trust committee of directors or
responsible officers of the Indenture Trustee, or any one or more of them,
shall in good faith determine that the withholding of such notice is in the
interests of the holders of notes of such series; and provided, further, that
in the case of any default in the performance, or breach, of any covenant or
warranty referred to in clause (f) of the immediately preceding paragraph, no
such notice to holders shall be given until at least 60 days after the
occurrence thereof. (Section 8.02)
 
  If an Event of Default occurs with respect to notes of any series and is
continuing, the Indenture Trustee or the holders of 25% in principal amount of
the outstanding notes of that series may declare the principal of all the notes
of that series due and payable. A majority in principal amount of the
outstanding notes of that series may rescind and annul such declaration if the
default has been cured. (Section 7.02)
 
  The holders of a majority in principal amount of the outstanding notes of all
series affected by an Event of Default may waive any past default under the
Indenture and its consequences, except a default in the payment of the
principal of (or premium, if any) or interest on any note or in respect of a
covenant or provision of the Indenture which cannot be modified or amended
without the consent of the holder of each outstanding note affected. (Section
7.13)
 
  If an Event of Default occurs and is continuing, the Indenture Trustee may in
its discretion proceed to protect and enforce its rights and the rights of the
holders of notes by such appropriate judicial proceedings as the Indenture
Trustee shall deem most effectual. (Section 7.03)
 
  The Indenture provides that the holders of a majority in principal amount of
the outstanding notes issued under the Indenture have the right to direct the
time, method and place of conducting any proceeding for any remedy available to
the Indenture Trustee or exercising any trust or power conferred on the
Indenture Trustee. (Section 7.12) The Indenture Trustee is not obligated to
comply with any request or direction of noteholders pursuant to the Indenture
unless it has been offered indemnity against costs and liabilities which it
might incur in complying with such request or direction. (Section 8.03(e))
 
  The Company is required to file with the Indenture Trustee annually an
officers' certificate specifying any defaults known to exist under the
Indenture. (Section 3.04)
 
SATISFACTION AND DISCHARGE OF THE NOTES AND THE INDENTURE.
 
  Unless otherwise provided in the supplemental indenture creating a series of
notes, the Company shall be deemed to have paid and discharged the entire
indebtedness on all the outstanding notes of any such series when (a) either
(i)(1) the Company has deposited with the Indenture Trustee for such purpose an
amount sufficient to pay and discharge the entire indebtedness on all
outstanding notes of
 
                                       15
<PAGE>
 
such series for principal (and premium, if any) and interest to the stated
maturity or any redemption date thereof, or (2) the Company has deposited with
the Indenture Trustee for such purpose such amount of direct obligations of, or
obligations the principal of and interest on which are fully guaranteed by, the
United States of America and which are not callable at the option of the issuer
thereof as will, together with the income to accrue thereon without
consideration of any reinvestment thereof, be sufficient to pay and discharge
the entire indebtedness on all outstanding notes of such series for principal
(and premium, if any) and interest to the stated maturity or any redemption
date thereof, or (ii) the Company has properly fulfilled such other means of
satisfaction and discharge as is specified in the supplemental indenture
applicable to the notes of such series; (b) the Company has paid or caused to
be paid all other sums payable with respect to the outstanding notes of such
series; and (c) the Company has delivered certain certificates and an opinion
of counsel. (Section 6.03)
 
  The Indenture shall cease to be of further effect (except as to any surviving
rights of registration of transfer or exchange of notes) when (a) either (i)
all notes theretofore authenticated and delivered and all coupons appertaining
thereto have been delivered to the Indenture Trustee for cancellation, or (ii)
all such notes not theretofore delivered to the Indenture Trustee for
cancellation have become due and payable, or will become due and payable at
their stated maturity within one year, or are to be called for redemption
within one year under arrangements satisfactory to the Indenture Trustee and
the Company has deposited with the Indenture Trustee for such purpose an amount
sufficient to pay and discharge the entire indebtedness on such notes for
principal (and premium, if any) and interest to the date of such deposit (in
the case of notes which have become due and payable), or to their stated
maturity or redemption date, as the case may be; (b) the Company has paid or
caused to be paid all other sums payable under the Indenture by the Company;
and (c) the Company has delivered certain certificates and an opinion of
counsel. (Section 6.01)
 
  For federal income tax purposes, any such deposit may be treated as a taxable
exchange of the related notes for an issue of obligations of the trust or a
direct interest in the cash and securities held in the trust. In that case,
holders of such notes would recognize gain or loss as if the trust obligations
or the cash or securities deposited, as the case may be, had actually been
received by them in exchange for their notes. Such holders thereafter would be
required to include in income a share of the income, gain or loss of the trust.
The amount so required to be included in income could be a different amount
than would be includable in the absence of such deposit. Prospective investors
are urged to consult their own tax advisors as to the specific consequences to
them of such deposit.
 
                              DESCRIPTION OF STOCK
 
  The authorized stock of the Company now consists of four classes: prior
preferred stock, par value $100 per share (the "Prior Preferred Stock") (no
shares outstanding); $1.425 convertible preferred stock, without par value--
stated value $31.80 per share (the "$1.425 Convertible Preferred Stock");
preference stock, without par value (the New Cumulative Preference Stock to
constitute one or more new series of such class); and common stock, par value
$12.50 per share. The number of outstanding shares of each class as of March
31, 1994 is set forth in the Statements of Consolidated Capitalization, and the
number of authorized shares of each class is set forth in Note 4 of Notes to
Financial Statements, in the March 31, 1994 Form 10-Q.
 
ISSUANCE IN SERIES.
 
  The Board of Directors is authorized to provide for the issuance of shares of
the Prior Preferred Stock and the preference stock from time to time in series
and, as to each series, to fix the designation, dividend rate, redemption price
or prices, voluntary and involuntary liquidation prices, sinking fund
provisions, if any, and conversion provisions, if any, applicable to the shares
of such series.
 
                                       16
<PAGE>
 
DIVIDENDS.
 
  Dividends are payable on the Prior Preferred Stock (if and when shares
thereof are issued) in preference to dividends on the $1.425 Convertible
Preferred Stock, the preference stock and the common stock; dividends are
payable on the $1.425 Convertible Preferred Stock in preference to dividends on
the preference stock and the common stock; and dividends are payable on the
preference stock in preference to dividends on the common stock. Dividends are
payable on the Prior Preferred Stock (if and when shares thereof are issued),
the $1.425 Convertible Preferred Stock and each series of preference stock
quarterly on the first day of February, May, August and November in each year.
Dividends are cumulative with respect to the shares of the Prior Preferred
Stock (if and when shares thereof are issued), the $1.425 Convertible Preferred
Stock and each series of preference stock. Accumulations of dividends do not
bear interest.
 
  The dividend rates per share per annum are indicated by the title of the
$1.425 Convertible Preferred Stock and the respective titles of the following
outstanding series of preference stock: $1.90 series, $2.00 series, $1.96
series, $7.24 series, $8.40 series, $8.38 series, $8.20 series, $8.40 Series B,
$8.85 series, $9.25 series, $9.00 series and $6.875 series.
 
REDEMPTION AND REPURCHASE PROVISIONS.
 
  Subject to the limitations hereinafter stated and except as otherwise
provided by the Board of Directors in respect of the shares of a particular
series of the Prior Preferred Stock or the preference stock, shares of any one
or more of such series, and shares of the $1.425 Convertible Preferred Stock,
may be redeemed, on not more than 60 nor less than 30 days' notice by mail, in
whole at any time or in part from time to time at the option of the Company, or
in part from time to time pursuant to any sinking fund or funds created for one
or more series of the Prior Preferred Stock or the preference stock, in each
case by payment of the then applicable redemption price of the shares to be
redeemed. Provision is made whereby, subject to certain conditions, all rights
of the holders of shares called for redemption (except the right to exercise
any then effective privilege of conversion and the right to receive the
redemption moneys) will terminate before the redemption date, upon the deposit
with a bank or trust company of the funds necessary for redemption.
 
  If and so long as the Company shall be in default in the payment of any
quarterly dividend on shares of any series of the preference stock, or in the
making or setting aside of any payment under any sinking fund for any such
series, the Company may not (other than by the use of unapplied sinking fund
moneys) (1) redeem any shares of the preference stock unless all shares are
redeemed or (2) purchase or otherwise acquire for a consideration any such
shares, except pursuant to offers of sale made by holders of the preference
stock in response to an invitation for tenders given simultaneously by the
Company by mail to the holders of record of all shares of the preference stock
then outstanding. The Restated Articles of Incorporation of the Company contain
corresponding provisions applicable to the Prior Preferred Stock and, as to
dividend defaults, the $1.425 Convertible Preferred Stock.
 
  See Notes 6 and 7 of Notes to Financial Statements in the March 31, 1994 Form
10-Q for information relating to the redemption provisions applicable to the
presently outstanding shares of $1.425 Convertible Preferred Stock and of each
presently outstanding series of preference stock.
 
SINKING FUNDS.
 
  The $1.425 Convertible Preferred Stock and the $1.90 series, $2.00 series,
$1.96 series, $7.24 series, $8.40 series and $8.38 series of preference stock
do not have sinking funds. The $8.20 series, $8.40 Series B, $8.85 series,
$9.25 series, $9.00 series and $6.875 series of preference stock have mandatory
sinking funds and the $8.40 Series B and $9.00 series of preference stock also
have optional sinking funds. Each series of Prior Preferred Stock (if and when
shares thereof are issued) and any
 
                                       17
<PAGE>
 
additional series of preference stock may have a sinking fund, at the
discretion of the Board of Directors, along with such other provisions as shall
be fixed and determined by such Board. See Note 7 of Notes to Financial
Statements in the March 31, 1994 Form 10-Q for information relating to the
preference stock sinking fund provisions.
 
CONVERSION OF $1.425 CONVERTIBLE PREFERRED STOCK.
 
  The shares of $1.425 Convertible Preferred Stock are convertible, at the
option of the respective holders, into shares of common stock of the Company
currently at the rate of 1.02 shares of common stock for each share of $1.425
Convertible Preferred Stock. Provision is made for adjustment of the conversion
price, under certain conditions, in order to protect the conversion rights
against dilution. Shares of the $1.425 Convertible Preferred Stock may be
converted at any time except that in case of call for redemption the conversion
rights will terminate on the tenth day prior to the redemption date. No payment
or adjustment with respect to dividends on shares of the $1.425 Convertible
Preferred Stock or on the common stock will be made in connection with any
conversion.
 
LIQUIDATION PREFERENCES.
 
  In the event of dissolution, liquidation or winding up of the Company,
voluntary or involuntary, holders of the Prior Preferred Stock (if any shares
thereof are then issued) will be entitled to payment of the applicable
liquidation price or prices, out of the assets of the Company, in preference to
the holders of the $1.425 Convertible Preferred Stock, the preference stock and
the common stock; holders of the $1.425 Convertible Preferred Stock will be
entitled to such payment in preference to the holders of the preference stock
and the common stock; and holders of the preference stock will be entitled to
such payment in preference to the holders of the common stock.
 
  In the event of voluntary or involuntary dissolution, liquidation or winding
up of the Company, holders of the common stock will be entitled to receive,
ratably, assets of the Company available for payment to stockholders remaining
after payment in full of the preferential amounts on the Prior Preferred Stock
(if any), the $1.425 Convertible Preferred Stock and preference stock on such
dissolution, liquidation or winding up.
 
  The current per share voluntary liquidation prices of the outstanding shares
of the preference stock are: $8.20 series, $103 through October 31, 1997, and
$101 thereafter; $8.40 Series B, $101; $8.85 series, $103 through July 31,
1998, and $101 thereafter; $9.25 series, $105 through July 31, 1994, $103
through July 31, 1999, and $101 thereafter; $9.00 series, $106 through July 31,
1994, $105 through July 31, 1995, $104 through July 31, 1996, $103 through July
31, 1997, $102 through July 31, 1998, $101 through July 31, 1999, and $100
thereafter; $6.875 series, $105.75 through April 30, 1995, $104.625 through
April 30, 1996, $103.50 through April 30, 1997, $102.375 through April 30,
1998, $101.25 through April 30, 1999, and $100 thereafter; plus, in each case,
accrued and unpaid dividends, if any, to the date fixed for payment; and after
such respective dates at the applicable optional redemption prices (if any) for
the respective series. The per share voluntary liquidation prices of the
outstanding shares of the $1.90 series, $2.00 series, $1.96 series, $7.24
series, $8.40 series and $8.38 series of the preference stock and the $1.425
Convertible Preferred Stock are the respective optional redemption prices in
effect on the date of liquidation. See Notes 6 and 7 of Notes to Financial
Statements in the March 31, 1994 Form 10-Q for information concerning the
involuntary liquidation prices applicable to the presently outstanding shares
of such stock.
 
VOTING RIGHTS.
 
  Holders of shares at any time outstanding, regardless of class, are entitled
to one vote for each share held on each matter submitted to a vote at a meeting
of stockholders, with the right to cumulate votes in all elections for
directors.
 
                                       18
<PAGE>
 
  Without the vote or consent of the holders of at least two-thirds of the
outstanding shares, if any, of the Prior Preferred Stock, no stock of any prior
or parity class may be created, nor may the Restated Articles of Incorporation
of the Company be amended so as to affect any of the preferences or rights of
the Prior Preferred Stock as a class. Without the vote or consent of the
holders of at least two-thirds of the outstanding shares of the preference
stock, no stock of any class, other than the Prior Preferred Stock, ranking
prior to or on a parity with the preference stock may be created, nor may the
Restated Articles of Incorporation of the Company be amended so as to affect
any of the preferences or rights of the preference stock as a class. The
Restated Articles of Incorporation contain corresponding provisions applicable
to the $1.425 Convertible Preferred Stock as a class. No amendment so affecting
a single series of either the Prior Preferred Stock or the preference stock
(when more than one series of such class is outstanding) nor any amendment of
the resolution of the Board of Directors establishing such series may be made
that affects any of the preferences or rights of the holders of the shares of
such series without the vote or consent of the holders of at least two-thirds
of the outstanding shares of such series, but in such case the class vote or
consent of the holders of shares of no other series will be required.
 
  Without the vote or consent of the holders of a majority of the outstanding
shares, if any, of the Prior Preferred Stock, no shares of the class (in
addition to the 850,000 shares now authorized) or of any class ranking prior to
or on a parity with the Prior Preferred Stock may be issued (other than for the
retirement of a like amount of stock of such class or classes) if, after such
issue, the aggregate stated capital (including paid-in surplus) represented by
the outstanding shares of such class or classes (after giving effect to any
retirement of shares of such class or classes made in connection with such
issue) would exceed 75% of the aggregate stated capital (including paid-in
surplus) represented by the then outstanding shares of all subordinate classes,
plus consolidated retained earnings of the Company and consolidated
subsidiaries as of the end of the preceding fiscal year.
 
  Without the vote or consent of the holders of a majority of the outstanding
shares, if any, of the Prior Preferred Stock, the $1.425 Convertible Preferred
Stock and the preference stock, each voting as a class, the Company may not
(except where the parties are in a parent-subsidiary relationship, or when
ordered by governmental commission or agency) consolidate with or merge into
any other corporation or sell all or substantially all of its property and
business.
 
PREEMPTIVE RIGHTS.
 
  Holders of the Prior Preferred Stock, the $1.425 Convertible Preferred Stock,
the preference stock and the common stock have no preemptive rights to purchase
any securities of the Company.
 
MISCELLANEOUS.
 
  The outstanding shares of the $1.425 Convertible Preferred Stock, the
preference stock and the common stock are, and the shares of the New Cumulative
Preference Stock offered hereby will be, when issued, fully paid and
nonassessable.
 
  The Transfer Agent and Registrar for the New Cumulative Preference Stock will
be:
 
      THE FIRST CHICAGO TRUST COMPANY OF NEW YORK
      30 West Broadway
      New York, New York 10007-2192
      and
      1 North State Street
      Chicago, Illinois 60670-0123
 
                                       19
<PAGE>
 
                              PLAN OF DISTRIBUTION
 
  The Securities may be sold (i) by selecting and negotiating with a managing
underwriter or underwriters for the sale, (ii) by a sale directly to a limited
number of purchasers or to a single purchaser or (iii) through agents.
Securities may be sold outside the United States.
 
  The Prospectus Supplement sets forth the manner and terms of the offering of
the Offered Securities, including the name or names of any underwriters,
dealers or agents, the purchase price or prices of the Offered Securities, the
proceeds to the Company from the sale of the Offered Securities, any initial
public offering price, any underwriting discount or commission and any
discounts, concessions or commissions allowed or reallowed or paid by any
underwriter to other dealers. Any initial public offering price and any
discounts, concessions or commissions allowed or reallowed or paid to dealers
may be changed from time to time. Unless otherwise indicated in the Prospectus
Supplement, any agent will be acting on a best efforts basis for the period of
its appointment.
 
  Underwriters, dealers and agents who participate in the distribution of the
Securities, and their officers, directors and controlling persons, may be
entitled under agreements to be entered into with the Company to
indemnification by the Company against certain liabilities, including
liabilities under the Securities Act of 1933, or to contribution with respect
to payments which such underwriters, dealers or agents may be required to make
in respect of such liabilities.
 
  Unless otherwise set forth in the Prospectus Supplement, the obligations of
any underwriter or underwriters to purchase the Offered Securities will be
subject to certain conditions precedent and such underwriter or underwriters
with respect to the sale of such Offered Securities will be obligated to
purchase all of such Offered Securities if any are purchased.
 
  The Prospectus Supplement sets forth any planned listing of the Offered
Securities on a national securities exchange and indicates whether any
underwriters, dealers or agents intend to make a market in the Offered
Securities as permitted by applicable laws and regulations. No assurance can be
given as to the liquidity of or the trading market for the Securities.
 
                                 LEGAL OPINIONS
 
  The legality of the Securities will be passed upon by Sidley & Austin, One
First National Plaza, Chicago, Illinois 60603, counsel for the Company, and by
Winston & Strawn, 35 West Wacker Drive, Chicago, Illinois 60601, counsel for
the underwriters, dealers, purchasers or agents. Winston & Strawn acts from
time to time as counsel for the Company in certain matters. The statements as
to matters of law and legal conclusions made under "Description of Bonds,"
subcaption "Security," and "Description of Stock" herein are made on the
authority of Sidley & Austin.
 
                                    EXPERTS
 
  The financial statements and schedules included or incorporated by reference
in the 1993 Form 10-K, the January 28, 1994 Form 8-K/A-1 Report and the March
31, 1994 Form 10-Q have been audited by Arthur Andersen & Co., independent
public accountants, as indicated in their reports with respect thereto, and are
incorporated herein in reliance upon the authority of said firm as experts in
accounting and auditing in giving said reports. Reference is made to said
reports each of which includes an explanatory paragraph with respect to a
change in the method of accounting for postretirement health care benefits and
income taxes, as discussed in Notes 13 and 14 to the financial statements,
respectively.
 
                                       20
<PAGE>
 
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  NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY REPRE-
SENTATIONS IN CONNECTION WITH THIS OFFERING OTHER THAN THOSE CONTAINED IN THIS
PROSPECTUS SUPPLEMENT AND THE PROSPECTUS AND, IF GIVEN OR MADE, SUCH OTHER IN-
FORMATION AND REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED
BY THE COMPANY OR THE UNDERWRITERS. NEITHER THE DELIVERY OF THIS PROSPECTUS
SUPPLEMENT AND THE PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY CIR-
CUMSTANCES, CREATE ANY IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS
OF THE COMPANY SINCE THE DATE HEREOF OR THAT THE INFORMATION CONTAINED HEREIN
IS CORRECT AS OF ANY TIME SUBSEQUENT TO ITS DATE. THIS PROSPECTUS SUPPLEMENT
AND THE PROSPECTUS DO NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN
OFFER TO BUY ANY SECURITIES OTHER THAN THE REGISTERED SECURITIES TO WHICH THE
PROSPECTUS SUPPLEMENT RELATES. THIS PROSPECTUS SUPPLEMENT AND THE PROSPECTUS DO
NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO BUY SUCH SECU-
RITIES IN ANY CIRCUMSTANCES IN WHICH SUCH OFFER OR SOLICITATION IS UNLAWFUL.
 
                                ---------------
 
                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
                             PROSPECTUS SUPPLEMENT
<S>                                                                          <C>
$2.425 Cumulative Preference Stock.......................................... S-2
Underwriting................................................................ S-3
 
                                   PROSPECTUS
 
The Company.................................................................   2
Available Information.......................................................   2
Incorporation of Certain Information by Reference...........................   2
Recent Rate Proceedings.....................................................   3
Summary Information.........................................................   4
Use of Proceeds.............................................................   8
Description of Bonds........................................................   8
Description of Notes........................................................  13
Description of Stock........................................................  16
Plan of Distribution........................................................  20
Legal Opinions..............................................................  20
Experts.....................................................................  20
</TABLE>
 
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                                3,000,000 SHARES
 
                                      LOGO
 
                                  COMMONWEALTH
                                 EDISON COMPANY
 
                               $2.425 CUMULATIVE
                                PREFERENCE STOCK
                              (WITHOUT PAR VALUE)
 
                                ---------------
                             PROSPECTUS SUPPLEMENT
 
                                ---------------
 
                            PAINEWEBBER INCORPORATED
 
                              MERRILL LYNCH & CO.
 
                              SALOMON BROTHERS INC
 
                                ---------------
 
                                 JUNE 29, 1994
 
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