UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
 
SCHEDULE 14A
(RULE 14a-101)
SCHEDULE 14A INFORMATION
Proxy Statement Pursuant to Section 14(a)
of the Securities Exchange Act of 1934
 
Filed by the Registrant ¨
Filed by a Party other than the Registrant x
Check the appropriate box:
 
¨	Preliminary Proxy Statement.	
 
¨	Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)).	
 
¨	Definitive Proxy Statement.	
 
x	Definitive Additional Materials.	
 
¨	Soliciting Material Pursuant to §240.14a-12.	

NRG ENERGY, INC.

(Name of Registrant as Specified in its Charter)

EXELON CORPORATION

(Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)
 
Payment of Filing Fee (Check the appropriate box):
 
x	No fee required.	
 
¨	Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.	
 
 	(1)	Title of each class of securities to which the transaction applies:	

 	

	
 	(2)	Aggregate number of securities to which the transaction applies:	

 	

	
 	(3)	Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):	

 	

	
 	(4)	Proposed maximum aggregate value of the transaction:	

 	

	
 	(5)	Total fee paid:	

 	

	

¨	Fee paid previously with preliminary materials.	
 
¨	Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the form or schedule and the date of its filing.	
 
 	(1)	Amount Previously Paid:	

 	

	
 	(2)	Form, Schedule or Registration Statement No.:	

 	

	
 	(3)	Filing Party:	

 	

	
 	(4)	Date Filed:	

 	

	

On July 16, 2009, Exelon Corporation placed the following advertisement in the Wall Street Journal:

 
 	 	 	 	 	
 	 	    IMPORTANT    	 	 	
 	
If you have any questions or need assistance in voting the BLUE proxy cardFOR Exelon’s proposals,
please contact our proxy solicitor, Innisfree M&A Incorporated:	
 	
Stockholders Call Toll-Free: 877-750-9501	
Banks and Brokers Call Collect: 212-750-5833	
 	
Remember, even if you have already voted NRG’s White proxy, you have every right to change your vote by
executing theBLUE proxy card, since only your latest dated proxy card will count at the NRG meeting.	
Important Information
This communication relates, in part, to the offer (the “Offer”) by Exelon Corporation (“Exelon”) through its direct wholly-owned subsidiary, Exelon Xchange Corporation (“Xchange”), to exchange each issued and outstanding share of common stock (the “NRG shares”) of NRG Energy, Inc. (“NRG”) for 0.545 of a share of Exelon common stock. This communication is for informational purposes only and does not constitute an offer to exchange, or a solicitation of an offer to exchange, NRG shares, nor is it a substitute for the Tender Offer Statement on Schedule TO or the Prospectus/Offer to Exchange included in the Registration Statement on Form S-4 (Reg. No. 333-155278) (including the Letter of Transmittal and related documents and as amended from time to time, the “Exchange Offer Documents”) previously filed by Exelon and Xchange with the Securities and Exchange Commission (the “SEC”). The Offer is made only through the Exchange Offer Documents.  Investors and security holders are urged to read these documents and other relevant materials as they become available, because they will contain important information.
Investors and security holders can obtain copies of the materials described above (and all other related documents filed with the SEC) at no charge on the SEC’s website: www.sec.gov. Copies can also be obtained at no charge by directing a request for such materials to Innisfree M&A Incorporated, 501 Madison Avenue, 20th Floor, New York, New York 10022, toll free at 1-877-750-9501. Investors and security holders may also read and copy any reports, statements and other information filed by Exelon, Xchange or NRG with the SEC, at the SEC public reference room at 100 F Street, N.E., Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 or visit the SEC’s website for further information on its public reference room.