Initial Statement of Beneficial Ownership

FORM 3	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0104 Expires: February 28, 2011 Estimated average burden hours per response... 0.5
	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

1. Name and Address of Reporting Person ^*
Manasco Shon J.
2. Date of Event Requiring Statement (MM/DD/YYYY) 8/11/2009
3. Issuer Name and Ticker or Trading Symbol
CONSTELLATION ENERGY GROUP INC [CEG]

(Last)        (First)        (Middle)
100 CONSTELLATION WAY
4. Relationship of Reporting Person(s) to Issuer (Check all applicable)
_____ Director                            _____ 10% Owner
___ X ___ Officer (give title below)          _____ Other (specify below)
Senior Vice President /

(Street)
BALTIMORE, MD 21202

(City)              (State)              (Zip) 5. If Amendment, Date Original Filed (MM/DD/YYYY)

6. Individual or Joint/Group Filing (Check Applicable Line)
_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned

1.Title of Security
(Instr. 4) 2. Amount of Securities Beneficially Owned
(Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5) 4. Nature of Indirect Beneficial Ownership
(Instr. 5)

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)

1. Title of Derivate Security
(Instr. 4) 2. Date Exercisable and Expiration Date
(MM/DD/YYYY) 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5) 6. Nature of Indirect Beneficial Ownership
(Instr. 5)

Date Exercisable Expiration Date Title Amount or Number of Shares

Employee stock option (right to buy) ⁽¹⁾ 2/27/2019 Common Stock 14420 $19.76 D

Employee stock option (right to buy) ⁽²⁾ 4/21/2018 Common Stock 3200 $92.20 D

Restricted stock units ⁽³⁾ ⁽³⁾ Common Stock 1936.2644 ⁽⁴⁾ ⁽⁵⁾ D

Explanation of Responses:

( 1) Option granted on 2/27/09 will vest in three equal annual installments on 2/27/10, 2/27/11, and 2/27/12.

( 2) Option granted on 4/21/08 will vest in three equal annual installments beginning on 2/21/09. The second and third installments will vest on 2/21/10 and 2/21/11.

( 3) Units granted on 4/21/08 will vest in three equal annual installments beginning on 4/21/09. The second and third installments will vest on 4/21/10 and 4/21/11.

( 4) This amount is the remaining balance on units granted on 4/21/08 and includes shares obtained through reinvested dividends. The first installment vested on 4/21/09 and the net shares after shares were withheld to pay the taxes due were sold prior to the reporting person becoming an insider subject to Section 16.

( 5) The units may be settled at the sole discretion of the issuer in cash or common stock. In addition, the units will pay dividends which will be reinvested.

Reporting Owners

Reporting Owner Name / Address Relationships

Director 10% Owner Officer Other

Manasco Shon J.
100 CONSTELLATION WAY
BALTIMORE, MD 21202

Senior Vice President

Signatures

S J Manasco 8/20/2009

^** Signature of Reporting Person Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 5(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).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.

Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

*Table II - Derivative Securities Beneficially Owned ( e.g.* , puts, calls, warrants, options, convertible securities)**
1. Title of Derivate Security (Instr. 4)	2. Date Exercisable and Expiration Date (MM/DD/YYYY)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivate Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security		6. Nature of Indirect Beneficial Ownership (Instr. 5)
Employee stock option (right to buy)	⁽¹⁾	2/27/2019	Common Stock	14420	$19.76	D
Employee stock option (right to buy)	⁽²⁾	4/21/2018	Common Stock	3200	$92.20	D
Restricted stock units	⁽³⁾	⁽³⁾	Common Stock	1936.2644 ⁽⁴⁾	⁽⁵⁾	D

Explanation of Responses:
( 1)	Option granted on 2/27/09 will vest in three equal annual installments on 2/27/10, 2/27/11, and 2/27/12.
( 2)	Option granted on 4/21/08 will vest in three equal annual installments beginning on 2/21/09. The second and third installments will vest on 2/21/10 and 2/21/11.
( 3)	Units granted on 4/21/08 will vest in three equal annual installments beginning on 4/21/09. The second and third installments will vest on 4/21/10 and 4/21/11.
( 4)	This amount is the remaining balance on units granted on 4/21/08 and includes shares obtained through reinvested dividends. The first installment vested on 4/21/09 and the net shares after shares were withheld to pay the taxes due were sold prior to the reporting person becoming an insider subject to Section 16.
( 5)	The units may be settled at the sole discretion of the issuer in cash or common stock. In addition, the units will pay dividends which will be reinvested.

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
Manasco Shon J. 100 CONSTELLATION WAY BALTIMORE, MD 21202			Senior Vice President

Signatures
S J Manasco		8/20/2009
^** Signature of Reporting Person		Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
*	If the form is filed by more than one reporting person, see Instruction 5(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).
Note:	File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.