Edgar Filing: NRG ENERGY, INC.

424B3

Filed Pursuant to Rule 424(b)(3)

Registration No. 333-123677

Prospectus Supplement No. 2 dated October 3, 2005

(To Prospectus dated June 2, 2005)

NRG Energy, Inc.

420,000 Shares of 4% Convertible Perpetual Preferred Stock

10,500,000 Shares of Common Stock issuable upon conversion of the Preferred Stock

This Prospectus Supplement supplements the prospectus dated June 2, 2005 (the “Prospectus”) of NRG Energy, Inc., relating to the sale by certain of our stockholders (including their pledgees, donees, assignees, transferees, successors and others who later hold any of the selling stockholders’ interests) of up to 420,000 shares of preferred stock, or 10,500,000 shares of our common stock issuable upon conversion of the preferred stock. You should read this Prospectus Supplement in conjunction with the Prospectus, and this Prospectus Supplement is qualified by reference to the Prospectus, except to the extent that the information in this Prospectus Supplement supersedes the information contained in the Prospectus.

Investing in our preferred stock or common stock involves risks that are described in the “Risk Factors” section beginning on page 6 of the Prospectus.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this Prospectus Supplement is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this Prospectus Supplement is October 3, 2005

The table of selling stockholders contained in the Prospectus is hereby superseded by the following table:


	Ownership Before				Securities Offered by the				Ownership After Offering(2)
	Offering				Prospectus(1)
													% of
Name	Preferred		Common(3)		Preferred		Common(3)		Preferred		Common		Common(4)

1976 Distribution Trust FBO A.R. Lauder/Zinterhofer		6		150		6		150		0		0		0
2000 Revocable Trust FBO A.R. Lauder/Zinterhofer		5		125		5		125		0		0		0
Advent Claymore Enhance Growth & Income Fund		2,435		60,875		2,435		60,875		0		0		0
Advent Convertible Master (Cayman), L.P.		6,723		168,075		6,723		168,075		0		0		0
Alcon Laboratories		641		16,025		641		16,025		0		0		0
AM International EMAC 63 Ltd.		790		19,750		790		19,750		0		0		0
AM Master Fund I, LP		6,916		172,900		6,916		172,900		0		0		0
Arlington County Employees Retirement Systems		1,032		25,800		1,032		25,800		0		0		0
Asante Health Systems		205		5,125		205		5,125		0		0		0
BBT Fund, L.P.		8,850		221,250		8,850		221,250		0		0		0
Boston Income Portfolio c/o EatonVance Management High Yield Group		1,255		31,375		1,255		31,375		0		0		0
Castlerigg Master Investments Ltd.		500		774,600		500		12,500		0		762,100		*
Citigroup Global Markets, Inc.(5)		4,994		124,850		4,994		124,850		0		0		0
City of New York Fire Dept. Pension Fund High Yield		125		3,125		125		3,125		0		0		0
City of New York Teachers Retirement System High Yield		375		9,375		375		9,375		0		0		0
City University of New York		215		5,375		215		5,375		0		0		0
CNHCA Master Account, LP		5,500		137,500		5,500		137,500		0		0		0
Coastal Convertibles Ltd.		1,500		37,500		1,500		37,500		0		0		0
Concentrated Alpha Partners LP		6,750		168,750		6,750		168,750		0		0		0
DBAG London		11,500		287,500		11,500		287,500		0		0		0
Delaware Dividend Income Fund		1,500		37,500		1,500		37,500		0		0		0
Delaware Public Employees Retirement Systems		1,857		46,425		1,857		46,425		0		0		0
Deutsche Bank Securities Inc.		1,500		37,500		1,500		37,500		0		0		0
Diversified High Yield Bond Fund c/o Eaton Vance Management High Yield Group		245		6,125		245		6,125		0		0		0
Drawbridge Convertible I Ltd.		489		12,225		489		12,225		0		0		0
Drawbridge Convertible II Ltd.		156		3,900		156		3,900		0		0		0
Drawbridge Global Macro Masterfund Ltd.		3,310		82,750		3,310		82,750		0		0		0
ELCA Unscreened — High Yield		275		6,875		275		6,875		0		0		0
Fidelity Financial Trust: Fidelity Strategic Dividend & Income Fund(6)		3,900		97,500		3,900		97,500		0		0		0
Frontpoint Convertible Arbitrage Fund LP		5,000		125,000		5,000		125,000		0		0		0
GLG Market Neutral Fund		22,000		550,000		22,000		550,000		0		0		0
Grace Convertible Arbitrage Fund, Ltd.		7,000		175,000		7,000		175,000		0		0		0
Grady Hospital		201		5,025		201		5,025		0		0		0
Guggenheim Portfolio Company XXXI, LLC		5,000		125,000		5,000		125,000		0		0		0
Hallmark Master Trust High Yield Fund c/o Eaton Vance Management High Yield Group		70		1,750		70		1,750		0		0		0
HFR CA Opportunity Mgt. Trst.		340		8,500		340		8,500		0		0		0
HFR CA Select Fund		750		18,750		750		18,750		0		0		0
HFR RVA Combined Master Trust		2,000		50,000		2,000		50,000		0		0		0
High Income Portfolio c/o Eaton Vance Management High Yield Group		865		21,625		865		21,625		0		0		0


	Ownership Before				Securities Offered by the				Ownership After Offering(2)
	Offering				Prospectus(1)
													% of
Name	Preferred		Common(3)		Preferred		Common(3)		Preferred		Common		Common(4)

IAM National Pension Fund		375		9,375		375		9,375		0		0		0
Independence Blue Cross		623		15,575		623		15,575		0		0		0
Industriens Pensionsforsikring		175		4,375		175		4,375		0		0		0
ING MFS Utilities Portfolio		40		79,520		40		1,000		0		78,520		*
ING T. RowePrice Capital Appreciation Portfolio		12,000		300,000		12,000		300,000		0		0		0
Intl Union of Operating Engineers (ENG) c/o Eaton Vance Management High Yield Group		15		375		15		375		0		0		0
JHVST MidCap Value B		200		52,200		200		5,000		0		47,200		*
JMG Capital Partners, Inc		2,350		58,750		2,350		58,750		0		0		0
JMG Triton Offshore Ltd.		2,850		71,250		2,850		71,250		0		0		0
John Hancock Trust Utilities Trust		100		133,640		100		2,500		0		131,140		*
John Hancock Variable Series Trust I — Mid Cap Value		200		45,600		200		5,000		0		40,600		*
JP Morgan Securities, Inc.		2,500		31,650		2,500		31,650		0		0		0
Kamunting Street Master Fund, Ltd.		22,500		562,500		22,500		562,500		0		0		0
KBC Financial Products USA, Inc.		8,955		223,875		8,955		223,875		0		0		0
KDC Convertible Arbitrage Fund LP		3,000		75,000		3,000		75,000		0		0		0
Laborers District Council & Contractors Pension FD of Ohio		200		27,200		200		5,000		0		22,200		*
LIJ Invest — Global High Yield		275		6,875		275		6,875		0		0		0
Lyxor		465		11,625		465		11,625		0		0		0
Lyxor/AM Investment Fund Ltd.		988		24,700		988		24,700		0		0		0
Lyxor/Silverado Fund LTD		1,550		38,750		1,550		38,750		0		0		0
McMahan Securities Co. LP		45		1,125		45		1,125		0		0		0
MFS Utilities Fund, a Series of MFS Series Trust VI		1,355		1,614,875		1,355		33,875		0		1,581,000		1.96	%
MFS Variable Insurance Trust - MFS Utilities Series		820		874,400		820		20,500		0		853,900		1.06	%
MFS/Sun Life Series Trust: Utilities Series		324		363,800		324		8,100		0		355,700		*
MSS Convertible Arbitrage 1		20		500		20		500		0		0		0
National Bank of Canada		1,186		29,650		1,186		29,650		0		0		0
New Orleans Firefighters Pension/Relief Fund		126		3,150		126		3,150		0		0		0
New York City Employees Retirement Systems Enhanced Fund		475		11,875		475		11,875		0		0		0
Newport Alternative Income Fund		2,972		74,300		2,972		74,300		0		0		0
NMS Services (Cayman) Inc.		1,176		29,400		1,176		29,400		0		0		0
Occidental Petroleum Corporation		114		2,850		114		2,850		0		0		0
Pebble Limited Partnership		2,490		62,250		2,490		62,250		0		0		0
Penn Series Flexibly Managed Fund		5,600		140,000		5,600		140,000		0		0		0
Penn Series High Yield Bond Fund		100		2,500		100		2,500		0		0		0
PensionsInvest — Global High Yield		250		6,250		250		6,250		0		0		0
PFA Invest — Global High Yield		450		11,250		450		11,250		0		0		0
PIMCO Convertible Fund		500		12,500		500		12,500		0		0		0
Policeman and Fireman Retirement System of the City of Detroit		500		12,500		500		12,500		0		0		0
Pro-Mutual		1,357		33,925		1,357		33,925		0		0		0


	Ownership Before				Securities Offered by the				Ownership After Offering(2)
	Offering				Prospectus(1)
													% of
Name	Preferred		Common(3)		Preferred		Common(3)		Preferred		Common		Common(4)

RWDSU Local 338 High Yield Fund c/o Eaton Vance Management High Yield Fund		20		500		20		500		0		0		0
S.A.C. Arbitrage Fund, LLC		8,000		200,000		8,000		200,000		0		0		0
Sage Capital Management LLC		3,000		75,000		3,000		75,000		0		0		0
Salomon Brothers Asset Management, Inc.(7)		6,700		167,500		6,700		167,500		0		0		0
SEPTA High Yield Fund c/o Eaton Vance Management High Yield Fund		20		500		20		500		0		0		0
Severn River Master Fund c/o Morgan Stanley		1,000		25,000		1,000		25,000		0		0		0
Silver Point Capital Fund LP		1,365		1,042,333		1,365		34,125		0		1,008,208		1.25	%
Silver Point Capital Offshore Fund, Ltd.		2,135		1,654,740		2,135		53,375		0		1,601,365		1.98	%
Silverado Arbitrage Trading, Ltd.		500		22,500		500		12,500		0		10,000		*
Silvercreek II Limited		9,447		236,175		9,447		236,175		0		0		0
Silvercreek Limited Partnership		9,591		239,775		9,591		239,775		0		0		0
SOCS Ltd.		10,000		250,000		8,000		250,000		2,000		0		0
Sphinx Fund		140		3,500		140		3,500		0		0		0
SRI Fund, L.P.		1,500		37,500		1,500		37,500		0		0		0
Stanfield Offshore Leveraged Assets, Ltd.		10,500		693,213		10,500		262,500		0		430,713		*
T. RowePrice Capital Appreciation Fund		33,600		840,000		33,600		840,000		0		0		0
T. RowePrice High Yield Fund		4,550		113,750		4,550		113,750		0		0		0
T. RowePrice Mid-Cap Value Fund		12,000		1,762,500		12,000		300,000		0		1,462,500		1.81	%
The New America High Income Fund		375		9,375		375		9,375		0		0		0
TQA Master Fund, LTD.		870		21,750		870		21,750		0		0		0
TQA Masters Plus Fund, LTD.		1,510		37,750		1,510		37,750		0		0		0
TRP Institutional High Yield Fund		375		9,375		375		9,375		0		0		0
TRP Invest — Global High Yield		75		1,875		75		1,875		0		0		0
TRP SICAV Global High Yield Bond Fund		1,125		28,125		1,125		28,125		0		0		0
Trustmark Insurance		393		9,825		393		9,825		0		0		0
UBS AG London F/B/O HFS		5,000		125,000		5,000		125,000		0		0		0
UBS AG London FBO PFEL		18,500		462,500		18,500		462,500		0		0		0
UBS AG london FBO WCBP		7,000		175,000		7,000		175,000		0		0		0
UBS O’Connor LLC F/B/O O’Connor Global Convertiable Arbitrage Master Ltd.		5,000		125,000		5,000		125,000		0		0		0
Volkswagen High Yield Bond Fund c/o Eaton Vance Management High Yield Group		10		250		10		250		0		0		0
Whitebox Convertible Arbitrage Partners LP		26,000		650,000		26,000		650,000		0		0		0
Whitebox Diversified Convertible Arbitrage Partners LP		5,000		125,000		5,000		125,000		0		0		0
Xavex — Convertible Arbitrage 7 Fund		150		3,750		150		3,750		0		0		0
Zazove Convertible Arbitrage Fund, LP		4,000		100,000		4,000		100,000		0		0		0
Zazove Hedged Convertible Fund, LP		2,000		50,000		2,000		50,000		0		0		0
Zurich Institutional Benchmarks Master Fund LTD c/o TQA Investors, LLC		180		4,500		180		4,500		0		0		0
Zurich Institutional Benchmarks Master Fund Ltd. c/o Forest Investment Management Fund		2,061		51,525		2,061		51,525		0		0		0


*	Less than 1%.


(1)	Amounts indicated may be in excess of the total amount registered due to sales or transfers exempt from the registration requirements of the Securities Act of 1933, as amended, since the date upon which the selling stockholders provided to us the information regarding their preferred stock.

(2)	The information regarding the beneficial ownership after resale of shares is based on the assumption that each selling stockholder will sell all of the shares of preferred stock and common stock owned by the selling stockholder and covered by the Prospectus.

(3)	Unless otherwise indicated, includes all shares of common stock issuable upon conversion of the preferred stock and assumes a conversion price of $40.00 per share, which is equal to an approximate conversion rate of 25 shares per share of preferred stock. However, this conversion price will be subject to adjustment as described under “Description of the Preferred Stock — Conversion Rights” in the Prospectus. As a result, the number of shares of common stock beneficially owned prior to this offering and the number of shares of common stock offered hereby may increase or decrease in the future.

(4)	Based on 80,701,198 shares of common stock outstanding as of September 29, 2005.

(5)	Citigroup Global Markets Inc. was a co-placement agent on the issuance of the preferred stock.

(6)	The entity is a registered investment fund advised by Fidelity Management & Research Company (“FMR Co.”), a registered investment adviser under the Investment Advisers Act of 1940, as amended. FMR Co., 82 Devonshire Street, Boston, Massachusetts 02190, a wholly-owned subsidiary of FMR Corp. and an investment adviser registered under Section 203 of the Investment Advisers Act of 1940, is the beneficial owner of 2,402,699 shares of our outstanding common stock as a result of acting as investment adviser to various investment companies registered under Section 8 of the Investment Company Act of 1940.

(7)	Salomon Brothers Asset Management, Inc. acts as discretionary investment advisor with respect to certain accounts that hold the preferred stock. Accordingly, Salomon Brothers Asset Management, Inc. may be deemed to be the beneficial owner of such preferred stock. Salomon Brothers Asset Management, Inc. is the beneficial owner and, therefore, the Selling Stockholder of the following accounts: General Motors Investment Corp. (5,000 shares), General Motors Broad Mandate (600 shares) and Smith Barney Convertible Fund (1,100 shares).