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 * Cleary Anne M   2. Issuer Name and Ticker or Trading Symbol GenOn Energy, Inc. [GEN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) SVP, Asset Mgmt (Last) (First) (Middle) 1000 MAIN STREET 3. Date of Earliest Transaction (Month/Day/Year) 12/14/2012 (Street) HOUSTON, TX 77002 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 12/14/2012   F   23,874 (1) D $ 2.87 320,966 D   Common Stock 12/14/2012   D   320,966 D (2) 0 D

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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	$ 8.7	12/14/2012		D			23,051	(3)	01/13/2016	Common Stock	23,051	(3)	0	D
Stock Options	$ 8.84	12/14/2012		D			25,463	(4)	02/17/2016	Common Stock	25,463	(4)	0	D
Stock Options	$ 13.06	12/14/2012		D			21,860	(5)	03/07/2013	Common Stock	21,860	(5)	0	D
Stock Options	$ 3.67	12/14/2012		D			67,036	(6)	03/03/2019	Common Stock	67,036	(6)	0	D
Stock Options	$ 4.66	12/14/2012		D			67,552	(7)	03/11/2020	Common Stock	67,552	(7)	0	D
Stock Options	$ 3.81	12/14/2012		D			81,553	(8)	02/22/2021	Common Stock	81,553	(8)	0	D
Stock Options	$ 2.44	12/14/2012		D			133,164	(8)(9)	02/26/2022	Common Stock	133,164	(9)	0	D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Cleary Anne M 1000 MAIN STREET HOUSTON, TX 77002			SVP, Asset Mgmt

Signatures

/s/ Anne M. Cleary		12/18/2012
**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 reporting person disposed of these shares to satisfy tax withholding obligations related to the vesting of stock units.
(2)	The reporting person disposed of these shares in connection with the merger (the "Merger") involving GenOn Energy, Inc. and NRG Energy, Inc. in exchange for shares of NRG Energy, Inc. common stock, based on the exchange ratio of 0.1216 and having a market value of $23.00 per share on the effective date of the Merger, plus cash consideration for fractional shares.
(3)	Upon completion of the merger involving GenOn Energy, Inc. and NRG Energy, Inc., this fully-vested option was converted into an option to purchase 2,803 shares of NRG Energy, Inc. common stock at $71.55 per share.
(4)	Upon completion of the merger involving GenOn Energy, Inc. and NRG Energy, Inc., this fully-vested option was converted into an option to purchase 3,096 shares of NRG Energy, Inc. common stock at $72.70 per share.
(5)	Upon completion of the merger involving GenOn Energy, Inc. and NRG Energy, Inc., this fully-vested option was converted into an option to purchase 2,658 shares of NRG Energy, Inc. common stock at $107.41 per share.
(6)	Upon completion of the merger involving GenOn Energy, Inc. and NRG Energy, Inc., this fully-vested option was converted into an option to purchase 8,151 shares of NRG Energy, Inc. common stock at $30.19 per share.
(7)	Upon completion of the merger involving GenOn Energy, Inc. and NRG Energy, Inc., this fully-vested option was converted into an option to purchase 8,214 shares of NRG Energy, Inc. common stock at $38.33 per share.
(8)	Upon completion of the merger involving GenOn Energy, Inc. and NRG Energy, Inc., this fully-vested option was converted into an option to purchase 9,916 shares of NRG Energy, Inc. common stock at $31.34 per share.
(9)	Upon completion of the merger involving GenOn Energy, Inc. and NRG Energy, Inc., these stock options, which vest in three equal annual installments beginning February 27, 2013, were converted into option to purchase 16,192 shares of NRG Energy, Inc. common stock at $20.07 per share.

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