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                                 FORM 10-K/A-1     
 
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
 
 (Mark one)
    [X]        ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF
                      THE SECURITIES EXCHANGE ACT OF 1934
                  FOR THE FISCAL YEAR ENDED DECEMBER 31, 1993
    [_]        TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
                    OF THE SECURITIES EXCHANGE ACT OF 1934
 
                         COMMISSION FILE NUMBER 1-1839
 
                          COMMONWEALTH EDISON COMPANY
            (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
    ILLINOIS                                                       36-0938600
(STATE OR OTHER                                                  (IRS EMPLOYER
JURISDICTION OF                                                  IDENTIFICATION
INCORPORATION OR                                                      NO.)
ORGANIZATION)
 
37TH FLOOR, 10 SOUTH DEARBORN STREET,
POST OFFICE BOX 767, CHICAGO, ILLINOIS                             60690-0767
(ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)                           (ZIP CODE)
 
REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: 312/394-4321
 
SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:
                                                                   NAME OF
     TITLE OF                                                        EACH
    EACH CLASS                                                     EXCHANGE
- ----------------------                                             ON WHICH
                                                                  REGISTERED
                                                             ------------------
FIRST MORTGAGE BONDS:
 7 5/8% SERIES 25, DUE      8 1/8% SERIES 36, DUE
 JUNE 1, 2003               JUNE 1, 2007
 8% SERIES 26, DUE          8 1/4% SERIES 37, DUE
 OCTOBER 15, 2003           DECEMBER 1, 2007                 NEW YORK
 8 1/8% SERIES 35, DUE
 JANUARY 15, 2007
 
SINKING FUND
DEBENTURES:
 
 3%, DUE APRIL 1, 1999      7 5/8% SERIES 1, DUE             NEW YORK
 2 7/8%, DUE APRIL 1,       FEBRUARY 15, 2003
 2001
 2 3/4%, DUE APRIL 1,                                        NEW YORK AND
 1999                                                         CHICAGO
 
COMMON STOCK, $12.50 PAR VALUE                               NEW YORK, CHICAGO
                                                             AND PACIFIC
 
COMMON STOCK PURCHASE WARRANTS--1971 WARRANTS
 AND SERIES B WARRANTS                                       NEW YORK, CHICAGO
                                                             AND PACIFIC
 
CUMULATIVE PREFERENCE STOCK, WITHOUT PAR VALUE:
 $1.90; $2.00; $7.24; $8.40; $8.38; AND $8.40 SERIES B       NEW YORK, CHICAGO
                                                             AND PACIFIC
 
$1.425 CONVERTIBLE PREFERRED STOCK, WITHOUT PAR VALUE        NEW YORK, CHICAGO
                                                             AND PACIFIC
 
  INDICATE BY CHECK MARK WHETHER THE REGISTRANT (1) HAS FILED ALL REPORTS RE-
QUIRED TO BE FILED BY SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF
1934 DURING THE PRECEDING 12 MONTHS, AND (2) HAS BEEN SUBJECT TO SUCH FILING
REQUIREMENTS FOR THE PAST 90 DAYS.

Yes [X].  No [_].
 
  INDICATE BY CHECK MARK IF DISCLOSURE OF DELINQUENT FILERS PURSUANT TO ITEM
405 OF REGULATION S-K IS NOT CONTAINED HEREIN, AND WILL NOT BE CONTAINED, TO
THE BEST OF REGISTRANT'S KNOWLEDGE, IN DEFINITIVE PROXY OR INFORMATION
STATEMENTS INCORPORATED BY REFERENCE IN PART III OF THIS FORM 10-K OR ANY
AMENDMENT TO THIS FORM 10-K. [ ]
 
  THE ESTIMATED AGGREGATE MARKET VALUE OF THE COMPANY'S OUTSTANDING COMMON
STOCK, $1.425 CONVERTIBLE PREFERRED STOCK AND CUMULATIVE PREFERENCE STOCK WAS
APPROXIMATELY $6,500,000,000 AS OF FEBRUARY 28, 1994. IN EXCESS OF 99.97% OF
THE COMPANY'S VOTING STOCK WAS OWNED BY NON-AFFILIATES AS OF THAT DATE.
 
  COMMON STOCK OUTSTANDING AT FEBRUARY 28, 1994: 213,794,548 SHARES

DOCUMENTS INCORPORATED BY REFERENCE:
  PORTIONS OF THE COMPANY'S CURRENT REPORT ON FORM 8-K/A-1 DATED JANUARY 28,
1994 ARE INCORPORATED BY REFERENCE INTO PARTS I, II AND IV HEREOF AND PORTIONS
OF THE COMPANY'S DEFINITIVE PROXY STATEMENT RELATING TO ITS ANNUAL MEETING OF
SHAREHOLDERS TO BE HELD MAY 10, 1994 ARE INCORPORATED BY REFERENCE INTO PARTS
I AND III HEREOF.
 
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     The purpose of this Amendment No. 1 is to correct certain exhibits
(Exhibits (10)-3, 4, 5 and 6) by refiling those exhibits in their entirety and
to file an additional exhibit (Exhibit (10)-19) to the Registrant's
(Commonwealth Edison Company) Annual Report on Form 10-K for the year ended
December 31, 1993.

ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K.

     The following exhibits are filed herewith.



     EXHIBIT
     NUMBER                  DESCRIPTION OF DOCUMENT
     -------    --------------------------------------------------
             
     (10)-3     1994 Long-Term Performance Unit Award for
                  Executive and Group Level Employes Payable in
                  1995 under the 1993 Long-Term Incentive Plan.
 
     (10)-4     1994 Long-Term Performance Unit Award for
                  Executive and Group Level Employes Payable in
                  1996 under the 1993 Long-Term Incentive Plan.
  
     (10)-5     1994 Long-Term Performance Unit Award for
                  Executive and Group Level Employes Payable in
                  1997 under the 1993 Long-Term Incentive Plan.

     (10)-6     1994 Variable Compensation Award for Management 
                  Employes under the 1993 Long-Term Incentive 
                  Plan.

     (10)-19    1994 Award to Mr. O'Connor and Mr. Skinner under 
                  the Commonwealth Edison Company 1993 Long-Term 
                  Incentive Plan.
 

                                       2

 
                                  SIGNATURES

    
     Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the registrant has duly caused this Amendment No. 1 to the
report to be signed on its behalf by the undersigned, thereunto duly authorized,
in the city of Chicago and state of Illinois on the 31st day of August, 
1994.     


                              COMMONWEALTH EDISON COMPANY
                                       Registrant

                              By     Roger F. Kovack
                                 -----------------------
                                     Roger F. Kovack
                                       Comptroller
                              (Principal accounting officer and
                               officer duly authorized to sign
                                on behalf of the registrant)

                                       3

 
                          COMMONWEALTH EDISON COMPANY
                          ---------------------------

                                 EXHIBIT INDEX
                                 -------------


     The following exhibits are filed herewith.



     EXHIBIT
     NUMBER                 DESCRIPTION OF DOCUMENT
     -------    ------------------------------------------------
             
     (10)-3     1994 Long-Term Performance Unit Award for
                  Executive and Group Level Employes Payable in
                  1995 under the 1993 Long-Term Incentive Plan.
 
     (10)-4     1994 Long-Term Performance Unit Award for
                  Executive and Group Level Employes Payable in
                  1996 under the 1993 Long-Term Incentive Plan.
 
     (10)-5     1994 Long-Term Performance Unit Award for
                  Executive and Group Level Employes Payable in
                  1997 under the 1993 Long-Term Incentive Plan.

     (10)-6     1994 Variable Compensation Award for Management 
                  Employes under the 1993 Long-Term Incentive 
                  Plan.

     (10)-19    1994 Award to Mr. O'Connor and Mr. Skinner under 
                  the Commonwealth Edison Company 1993 Long-Term 
                  Incentive Plan.