8-K

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

August 31, 2005
Date of Report (Date of earliest event reported)

Commission File	Exact Name of Registrant as Specified in Its Charter; State of Incorporation;	IRS Employer
Number	Address of Principal Executive Offices; and Telephone Number	Identification Number
1-16169	EXELON CORPORATION (a Pennsylvania corporation) 10 South Dearborn Street—37th Floor P.O. Box 805379 Chicago, Illinois 60680-5379 (312) 394-7398	23-2990190
1-1839	COMMONWEALTH EDISON COMPANY (an Illinois corporation) 10 South Dearborn Street — 37th Floor P.O. Box 805379 Chicago, Illinois 60680-5379 (312) 394-4321	36-0938600

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Section 8 — Other Events.
Item 8.01. Other Events.

On August 31, 2005, Exelon Corporation (Exelon) distributed a summary of the Commonwealth Edison Company (ComEd) delivery service rate case filing to Exelon’s financial community. A copy of the ComEd delivery service rate case summary is attached as Exhibit 99 to this Current Report on Form 8-K.

* * * * *

This combined Form 8-K is being furnished separately by Exelon and ComEd. Information contained herein relating to any individual registrant has been furnished by such registrant on its own behalf. No registrant makes any representation as to information relating to any other registrant.

Except for the historical information contained herein, certain of the matters discussed in this Report are forward-looking statements, within the meaning of the Private Securities Litigation Reform Act of 1995, that are subject to risks and uncertainties. The factors that could cause actual results to differ materially from the forward-looking statements made by a registrant include those factors discussed herein, as well as the items discussed in (a) the 2004 Annual Report on Form 10-K—ITEM 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations—Business Outlook and the Challenges in Managing Our Business for each of Exelon and ComEd, (b) the 2004 Annual Report on Form 10-K—ITEM 8. Financial Statements and Supplementary Data: Exelon—Note 20 and ComEd—Note 15 (c) Exelon’s Current Report on Form 8-K filed on May 13, 2005, including those discussed in Exhibit 99.2 “Management’s Discussion and Analysis of Financial Condition and Results of Operation “ and Exhibit 99.3 “Financial Statements and Supplementary Data” and (d) other factors discussed in filings with the SEC by Exelon and ComEd. Readers are cautioned not to place undue reliance on these forward-looking statements, which apply only as of the date of this Report. Neither Exelon nor ComEd undertakes any obligation to publicly release any revision to its forward-looking statements to reflect events or circumstances after the date of this Report.

SIGNATURES

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

EXELON CORPORATION
COMMONWEALTH EDISON COMPANY
 

/s/ J. Barry Mitchell  

J. Barry Mitchell 

Senior Vice President, Treasurer
and Chief Financial Officer
Exelon Corporation 

August 31, 2005

EX-99

Exhibit 99

Summary of ComEd Delivery Services Rate Case Proposal filed with the Illinois Commerce Commission on 8/31/05:

	Proposed			ICC Approved
($ in millions)	2005(1)			2001(2)			Change		%
Revenue Requirement	$	1,895		$	1,579	(4)	$	317		20.0	(5)
Rate Base	$	6,189		$	3,617		$	2,572		71.1
Cost of Capital		8.94	%		8.99	%
Debt / Equity Ratios		46% / 54	%(3)		57% / 43	%
Adjusted Debt Cost		6.50	%		6.95	%
Return on Equity		11.00	%		11.72	%
Operating Expenses	$	1,182		$	1,114		$	68		6.1

(1)	Based on a 2004 actual test year, adjusted for known and measurable 2005 cost changes
(2)	From March 2003 Agreement
(3)	Capital structure at 6/30/05; common equity excludes $2.3 billion related to the purchase accounting step-up in equity from the Unicom/PECO merger (including goodwill)
(4)	2004 revenue level at weather-normalized sales based on the rates approved in March 2003
(5)	The overall bill impact on the average residential customer’s bill would be approximately 6% as the delivery services rate represents about one-third of the average residential customer’s total bill.