FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * BRENNAN EDWARD A   2. Issuer Name and Ticker or Trading Symbol EXELON CORP [EXC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 10 SOUTH DEARBORN STREET, 37TH FLOOR 3. Date of Earliest Transaction (Month/Day/Year) 12/31/2004 (Street) CHICAGO, IL 60603 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock (Deferred Stock Units) 12/31/2004   A   298 A $ 41.98 7,658 (1) I By Exelon Directors' Deferred Stock Unit Plan Common Stock (Deferred Stock Units)               3,650 (2) I By Unicom Directors' Stock Unit Plan Common Stock               7,999 (3) D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Deferred Compensation - Phantom Shares

$ 0 (4)

12/31/2004

A

567

(4)

(4)

Common Stock

567

$ 44.07

9,909 (5)

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
BRENNAN EDWARD A 10 SOUTH DEARBORN STREET 37TH FLOOR CHICAGO, IL 60603	X

Signatures

Scott N. Peters, Attorney in Fact for Edward A. Brennan		01/03/2005
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Balance also includes 69 shares acquired on 12/10/2004 through the automatic dividend reinvestment feature of Exelon plans.
(2)	Balance also includes 34 shares acquired on 12/10/2004 through the automatic dividend reinvestment feature of Exelon plans.
(3)	Balance also includes 9 shares acquired on 12/10/2004 through the automatic dividend reinvestment feature of Exelon plans.
(4)	Phantom shares held in a multi-fund deferred compensation account to be settled for cash on a 1:1 basis upon the reporting person's termination of employment for any reason. Shares are acquired through regular periodic contributions and the reinvestment of dividend equivalents.
(5)	Balance also includes 88 shares acquired on 12/10/2004 through the automatic dividend reinvestment feature of Exelon plans.

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