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 * Perlman Beth Shari   2. Issuer Name and Ticker or Trading Symbol CONSTELLATION ENERGY GROUP INC [CEG] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) SrVPChiefAdminOffChiefInfoOff (Last) (First) (Middle) 750 E. PRATT STREET 3. Date of Earliest Transaction (Month/Day/Year) 08/22/2007 (Street) BALTIMORE, MD 21202 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 08/22/2007   M   4,000 A (1) $ 31.21 12,484 D   Common Stock 08/22/2007   S   4,000 D (1) $ 85 8,484 (2) D   Common Stock               459.6057 (3) I By 401(k) Plan

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

Stock Options (right to buy) (4)

$ 31.21

08/22/2007

M

4,000

(5)

05/24/2012

Common Stock

4,000

$ 0

14,667

D

Stock Options (right to buy) (4)

$ 75.85

02/22/2007

A

21,980

(6)

02/22/2017

Common Stock

21,980

$ 0

21,980

D

Stock Options (right to buy) (4)

$ 50.96

02/24/2005

A

32,770

(7)

02/24/2015

Common Stock

32,770

$ 0

32,770

D

Stock Options (right to buy) (4)

$ 39.63

02/26/2004

A

27,720

(8)

02/26/2014

Common Stock

27,720

$ 0

27,720

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Perlman Beth Shari 750 E. PRATT STREET BALTIMORE, MD 21202			SrVPChiefAdminOffChiefInfoOff

Signatures

Beth S. Perlman		08/23/2007
**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)	The option exercise and sale reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan. Additional exercises and sales in the amount of 4,000 shares are scheduled to occur quarterly over the next thirteen months pursuant to this trading plan, not to exceed an additional 16,000 shares.
(2)	This amount includes shares obtained through reinvested dividends.
(3)	This amount includes 29.0112 shares acquired since the Form 4 filed on 5/10/07.
(4)	These are employee stock options.
(5)	Options vested in three equal annual installments on 5/24/03, 5/24/04, and 5/24/05.
(6)	Options vest in three equal annual installments on 2/22/08, 2/22/09, and 2/22/10.
(7)	Options vest in three equal annual installments beginning on 2/24/06. The second installment vested on 2/24/07, and the third installment will vest on 2/24/08.
(8)	Options vested in three equal annual installments on 2/26/05, 2/26/06, and 2/26/07.

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