Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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 *
  H&F INVESTORS IV LLC
 2. Date of Event Requiring Statement (Month/Day/Year)
08/09/2006		 3. Issuer Name and Ticker or Trading Symbol
NRG ENERGY, INC. [NRG]
(Last)
(First)
(Middle)
ONE MARITIME PLAZA, 12TH FLOOR		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) __X__ Other (specify below)
See Remarks
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

SAN FRANCISCO, CA 94111		 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
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)
Common stock, par value $0.01 per share 6,415,953
I
See footnotes (1) (2)
Common stock, par value $0.01 per share 1,322,024
I
See footnotes (1) (2)
Common stock, par value $0.01 per share 524,231
I
See footnotes (1) (2)
Common stock, par value $0.01 per share 2,358
I
See footnotes (1) (2)
Common stock, par value $0.01 per share 169,176
I
See footnotes (1) (2)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 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

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
H&F INVESTORS IV LLC
ONE MARITIME PLAZA
12TH FLOOR
SAN FRANCISCO, CA 94111		     X   See Remarks
HELLMAN & FRIEDMAN CAPITAL PARTNERS IV LP
ONE MARITIME PLAZA
12TH FLOOR
SAN FRANCISCO, CA 94111		     X   See Remarks
H&F TGN AIV, L.P.
ONE MARITIME PLAZA
12TH FLOOR
SAN FRANCISCO, CA 94111		     X   See Remarks
H&F INTERNATIONAL PARTNERS IV-A, L.P.
ONE MARITIME PLAZA
12TH FLOOR
SAN FRANCISCO, CA 94111		     X   See Remarks
H&F International Partners IV-C, L.P.
ONE MARITIME PLAZA
12TH FLOOR
SAN FRANCISCO, CA 94111		     X   See Remarks
H&F EXECUTIVE FUND IV, L.P.
ONE MARITIME PLAZA
12TH FLOOR
SAN FRANCISCO, CA 94111		     X   See Remarks

Signatures

/s/ Georgia Lee as Managing Director of H&F Investors IV, LLC 08/11/2006
**Signature of Reporting Person Date
/s/ Georgia Lee as Managing Director of H&F Investors IV, LLC, as General Partner of Hellman & Friedman Capital Partners IV, L.P. 08/11/2006
**Signature of Reporting Person Date
/s/ Georgia Lee as Managing Director of H&F Investors IV, LLC, as General Partner of H&F TGN AIV, L.P. 08/11/2006
**Signature of Reporting Person Date
/s/ Georgia Lee as Managing Director of H&F Investors IV, LLC, as General Partner of H&F International Partners IV-A, L.P. 08/11/2006
**Signature of Reporting Person Date
/s/ Georgia Lee as Managing Director of H&F Investors IV, LLC, as General Partner of H&F International Partners IV-C, L.P. 08/11/2006
**Signature of Reporting Person Date
/s/ Georgia Lee as Managing Director of H&F Investors IV, LLC, as General Partner of H&F Executive Fund IV, L.P. 08/11/2006
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) Hellman & Friedman Capital Partners IV, L.P., H&F TGN AIV, L.P., H&F International Partners IV-A, L.P., H&F International Partners IV-C, L.P. and H&F Executive Fund IV, L.P., (collectively, the "H&F Partnerships") directly own respectively 6,415,953, 1,322,024, 524,231, 2,358 and 169,176 shares of NRG Energy, Inc.'s common stock (the "Common Stock") reported as beneficially owned in the above table. H&F Investors IV, LLC ("H&F Investors") is the general partner of each of the H&F Partnerships. The investment decisions of each of the H&F Partnerships are made by the investment committee of H&F Investors, which indirectly exercises voting and investment power with respect to the Common Stock held by the H&F Partnerships. Accordingly, H&F Investors may be deemed to share beneficial ownership of the shares of Common Stock held by the H&F Partnerships.
(2) Pursuant to Rule 16a-1(a)(4) of the Securities Exchange Act of 1934, as amended, H&F Investors herein states that this filing shall not be deemed an admission that it is the beneficial owner of any of the shares of Common Stock covered by this Statement. H&F Investors disclaims beneficial ownership of the Common Stock, except to the extent of its pecuniary interest in such shares of Common Stock.
 
Remarks:
As described in Amendment No. 1 to Schedule 13D filed on August 11, 2006 with respect to the Common Stock by the Reporting Persons and the other filers listed on the signature pages thereto (the "Other 13D Filers"), the H&F Partnerships and certain Other 13D Filers may be deemed to be a "group" under Section 13(d) of the Securities Exchange Act and each Reporting Person may be deemed to have beneficial ownership of 10% or more of the Common Stock.  Each Reporting Person expressly disclaims membership in any such group under Section 13(d) of the Securities Exchange Act or for any other purpose.

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