Company:  COMMONWEALTH EDISON CO (EXC)
Form Type:  10-Q
Filing Date:  10/27/2008 
CIK:  0000022606 
Address:  ONE FIRST NATIONAL PLZ 37TH FL
P O BOX 767 
City, State, Zip:  CHICAGO, Illinois 60690 
Telephone:  (312) 394-4321 
Fiscal Year:  12/31 
Last Trade
Last Trade: 
$44.22   		Change: 
0.46 (1.05%)  
Trade Time: 
Feb 09   		Market Cap: 
$29.18B
Description of Business
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  FORM 10-Q
    PART I. FINANCIAL INFORMATION
      Item 1. Financial Statements
        INCOME STATEMENT
        CASH FLOW
        BALANCE SHEET
        BALANCE SHEET
        STOCKHOLDERS EQUITY
        INCOME STATEMENT
        CASH FLOW
        BALANCE SHEET
        BALANCE SHEET
        STOCKHOLDERS EQUITY
        INCOME STATEMENT
        CASH FLOW
        BALANCE SHEET
        BALANCE SHEET
        STOCKHOLDERS EQUITY
        INCOME STATEMENT
        CASH FLOW
        BALANCE SHEET
        BALANCE SHEET
        STOCKHOLDERS EQUITY
        COMBINED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
          INCOME STATEMENT
      Item 2. Management's Discussion and Analysis of Financial ...
      Item 3. Quantitative and Qualitative Disclosures About ...
      Item 4. Controls and Procedures
    PART II - OTHER INFORMATION
      Item 1. Legal Proceedings
      Item 1A. Risk Factors
      Item 2. Unregistered Sales of Equity Securities and Use of ...
      Item 6. Exhibits
    SIGNATURES
  EXHIBIT 3.1.2
    ARTICLES OF INCORPORATION
    Section 507. Bylaws. Except as otherwise provided in the ...
  EXHIBIT 31.1
    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF ...
  EXHIBIT 31.2
    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF ...
  EXHIBIT 31.3
    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF ...
  EXHIBIT 31.4
    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF ...
  EXHIBIT 31.5
    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF ...
  EXHIBIT 31.6
    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF ...
  EXHIBIT 31.7
    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF ...
  EXHIBIT 31.8
    CERTIFICATION PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF ...
  EXHIBIT 32.1
    Certificate Pursuant to Section 1350 of Chapter 63 of Title ...
  EXHIBIT 32.2
    Certificate Pursuant to Section 1350 of Chapter 63 of Title ...
  EXHIBIT 32.3
    Certificate Pursuant to Section 1350 of Chapter 63 of Title ...
  EXHIBIT 32.4
    Certificate Pursuant to Section 1350 of Chapter 63 of Title ...
  EXHIBIT 32.5
    Certificate Pursuant to Section 1350 of Chapter 63 of Title ...
  EXHIBIT 32.6
    Certificate Pursuant to Section 1350 of Chapter 63 of Title ...
  EXHIBIT 32.7
    Certificate Pursuant to Section 1350 of Chapter 63 of Title ...
  EXHIBIT 32.8
    Certificate Pursuant to Section 1350 of Chapter 63 of Title ...
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