SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                  SCHEDULE 13G

                   Under the Securities Exchange Act of 1934


                                NRG Energy, Inc.
                                (Name of Issuer)


                         Common Stock, $0.01 par value
                         (Title of Class of Securities)


                                   629377508
                                 (CUSIP Number)


                                January 26, 2005
            (Date of Event Which Requires Filing of this Statement)

Check the following box to designate the rule pursuant to which the Schedule is
filed:

[ ]   Rule 13d-1(b)
[X]   Rule 13d-1(c)
[ ]   Rule 13d-1(d)


*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).


CUSIP NO. 629377508

   1.    NAMES OF REPORTING PERSONS
         I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
         D. E. Shaw Valence Portfolios, L.L.C.
         13-4046559

   2.    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
         (A)             [ ]
         (B)             [ ]

   3.    SEC USE ONLY

   4.    CITIZENSHIP OR PLACE OF ORGANIZATION
         Delaware

NUMBER OF            5.    SOLE VOTING POWER
SHARES
BENEFICIALLY
OWNED BY                   -0-
EACH
REPORTING
PERSON WITH
                     6.    SHARED VOTING POWER
                           4,041,749

                     7.    SOLE DISPOSITIVE POWER
                           -0-

                     8.    SHARED DISPOSITIVE POWER
                           4,041,749

   9.    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         4,041,749 (1)

   10.   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
         (SEE INSTRUCTIONS)  [   ]

   11.   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
         5.0% (2)

   12.   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
         OO

1 Consists of 3,768,800 common shares and 66,000 NRG 5.75% mandatory convertible
preferred stock, which is convertible to 272,949 shares.

2 Based on 80,701,198 shares of outstanding common stock ($0.01 par value)
outstanding and including the 272,949 shares from the potential conversion for a
total of 80,974,147 shares outstanding.




CUSIP NO. 629377508

   1.    NAMES OF REPORTING PERSONS
         I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
         D. E. Shaw & Co., L.P.
         13-3695715

   2.    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
         (A)             [ ]
         (B)             [ ]

   3.    SEC USE ONLY

   4.    CITIZENSHIP OR PLACE OF ORGANIZATION
         Delaware

NUMBER OF             5.       SOLE VOTING POWER
SHARES
BENEFICIALLY
OWNED BY                       -0-
EACH
REPORTING
PERSON WITH
                      6.       SHARED VOTING POWER
                               6,079,149

                      7.       SOLE DISPOSITIVE POWER
                               -0-

                      8.       SHARED DISPOSITIVE POWER
                               6,096,313

   9.    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         6,096,313 (1)

   10.   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
         (SEE INSTRUCTIONS)  [   ]

   11.   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
         7.5% (2)

   12.   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
         IA, PN

1 Consists of 5,823,364 common shares and 66,000 NRG 5.75% mandatory convertible
preferred stock, which is convertible to 272,949 shares.

2 Based on 80,701,198 shares of outstanding common stock ($0.01 par value)
outstanding and including the 272,949 shares from the potential conversion for a
total of 80,974,147 shares outstanding.





CUSIP NO. 629377508

      1.   NAMES OF REPORTING PERSONS
           I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
           David E. Shaw

      2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
           (A)           [ ]
           (B)           [ ]

      3.   SEC USE ONLY

      4.   CITIZENSHIP OR PLACE OF ORGANIZATION
           United States

NUMBER OF                5.      SOLE VOTING POWER
SHARES
BENEFICIALLY
OWNED BY                         -0-
EACH
REPORTING
PERSON WITH
                         6.      SHARED VOTING POWER
                                 6,079,149

                         7.      SOLE DISPOSITIVE POWER
                                 -0-

                         8.      SHARED DISPOSITIVE POWER
                                 6,096,313

      9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
           6,096,313 (1)

      10.  CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
           (SEE INSTRUCTIONS)   [   ]

      11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
           7.5% (2)

      12.  TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
           IN

1 Consists of 5,823,364 common shares and 66,000 NRG 5.75% mandatory convertible
preferred stock, which is convertible to 272,949 shares.

2 Based on 80,701,198 shares of outstanding common stock ($0.01 par value)
outstanding and including the 272,949 shares from the potential conversion for a
total of 80,974,147 shares outstanding.






ITEM 1.
     (A)  NAME OF ISSUER:
          NRG Energy, Inc.



     (B)  ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
          211 Carnegie Center
          Princeton, NJ 08540


ITEM 2.
     (A)  NAME OF PERSON FILING:
          D. E. Shaw Valence Portfolios, L.L.C.
          D. E. Shaw & Co., L.P.
          David E. Shaw



     (B)  ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE:
          The business address for each reporting person is:
          120 W. 45th Street, Tower 45, 39th Floor
          New York, NY 10036



     (C)  CITIZENSHIP:
          D. E. Shaw Valence Portfolios, L.L.C. is a limited liability company
          organized under the laws of the state of Delaware.
          D. E. Shaw & Co., L.P. is a limited partnership organized under the
          laws of the state of Delaware.
          David E. Shaw is a citizen of the United States of America.



     (D)  TITLE OF CLASS OF SECURITIES:
          Common Stock, $0.01 par value



     (E)  CUSIP NUMBER:
          629377508



ITEM 3.        IF THIS STATEMENT IS FILED PURSUANT TO RULE 13D-1(b) OR 13D-2(b)
               OR (c), CHECK WHETHER THE PERSON FILING IS A:

Not applicable

ITEM 4.        OWNERSHIP

As of February 2, 2006:

(a) Amount beneficially owned:

D. E. Shaw Valence Portfolios, L.L.C.:  4,041,749 shares
                                        This is composed of (i) 3,698,600
                                        shares in the name of D. E. Shaw
                                        Valence Portfolios, L.L.C., (ii)
                                        9,300 shares in the name of
                                        D. E. Shaw Valence, L.L.C., (iii) 60,900
                                        shares that D. E. Shaw Valence,
                                        L.L.C. has the right to acquire
                                        through the exercise of listed call
                                        options, and (iv) 272,949 shares
                                        that D. E. Shaw Valence Portfolios,
                                        L.L.C. has the right to acquire
                                        through the conversion of 66,000
                                        NRG 5.75% mandatory convertible
                                        preferred stock.


D. E. Shaw & Co., L.P.:                 6,096,313 shares
                                        This is composed of (i) 3,698,600
                                        shares in the name of D. E. Shaw
                                        Valence Portfolios, L.L.C., (ii)
                                        9,300 shares in the name of
                                        D. E. Shaw Valence, L.L.C., (iii) 60,900
                                        shares that D. E. Shaw Valence,
                                        L.L.C. has the right to acquire
                                        through the exercise of listed call
                                        options, (iv) 272,949 shares that
                                        D. E. Shaw Valence Portfolios,
                                        L.L.C. has the right to acquire
                                        through the conversion of 66,000
                                        NRG 5.75% mandatory convertible
                                        preferred stock, (v) 2,037,400
                                        shares in the name of D. E. Shaw
                                        Oculus Portfolios, L.L.C., and (vi)
                                        17,164 shares under the management
                                        of D. E. Shaw Investment
                                        Management, L.L.C.






David E. Shaw:                          6,096,313 shares
                                        This is composed of (i) 3,698,600
                                        shares in the name of D. E. Shaw
                                        Valence Portfolios, L.L.C., (ii)
                                        9,300 shares in the name of D. E.
                                        Shaw Valence, L.L.C., (iii) 60,900
                                        shares that D. E. Shaw Valence,
                                        L.L.C. has the right to acquire
                                        through the exercise of listed call
                                        options, (iv) 272,949 shares that
                                        D. E. Shaw Valence Portfolios,
                                        L.L.C. has the right to acquire
                                        through the conversion of 66,000
                                        NRG 5.75% mandatory convertible
                                        preferred stock, (v) 2,037,400
                                        shares in the name of D. E. Shaw
                                        Oculus Portfolios, L.L.C., and (vi)
                                        17,164 shares under the management
                                        of D. E. Shaw Investment
                                        Management, L.L.C.





(b)  Percent of class:
        D. E. Shaw Valence Portfolios, L.L.C.        5.0%
        D. E. Shaw & Co., L.P.:                      7.5%
        David E. Shaw:                               7.5%


(c)  Number of shares to which the person has:
        (i)  Sole power to vote or to direct the vote:
             D. E. Shaw Valence Portfolios, L.L.C.            -0- shares
             D. E. Shaw & Co., L.P.:                          -0- shares
             David E. Shaw:                                   -0- shares


       (ii)  Shared power to vote or to direct the vote:
             D. E. Shaw Valence Portfolios, L.L.C.            4,041,749 shares
             D. E. Shaw & Co., L.P.:                          6,079,149 shares
             David E. Shaw:                                   6,079,149 shares


      (iii)  Sole power to dispose or to
             direct the disposition of:
             D. E. Shaw Valence Portfolios, L.L.C.            -0- shares
             D. E. Shaw & Co., L.P.:                          -0- shares
             David E. Shaw:                                   -0- shares


       (iv)  Shared power to dispose or to direct
             the disposition of:
             D. E. Shaw Valence Portfolios, L.L.C.            4,041,749 shares
             D. E. Shaw & Co., L.P.:                          6,096,313 shares
             David E. Shaw:                                   6,096,313 shares

David E. Shaw does not own any shares directly. By virtue of David E. Shaw's
position as President and sole shareholder of D. E. Shaw & Co., Inc., which is
the general partner of D. E. Shaw & Co., L.P., which in turn is the managing
member and investment adviser of D. E. Shaw Valence Portfolios, L.L.C., the
managing member of D. E. Shaw Valance, L.L.C. and D. E. Shaw Investment
Management, L.L.C., and the investment adviser of D. E. Shaw Oculus Portfolios,
L.L.C., and by virtue of David E. Shaw's position as President and sole
shareholder of D. E. Shaw & Co. II, Inc., which is the managing member of
D. E. Shaw & Co., L.L.C., which in turn is the managing member of D. E. Shaw
Oculus Portfolios, L.L.C., David E. Shaw may be deemed to have the shared power
to vote or direct the vote of 6,079,149 shares, and the shared power to dispose
or direct the disposition of 6,096,313 shares, the 6,096,313 shares as described
above constituting 7.5% of the outstanding shares and, therefore, David E. Shaw
may be deemed to be the beneficial owner of such shares. David E. Shaw disclaims
beneficial ownership of such 6,096,313 shares.

ITEM 5.        OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS
Not Applicable

ITEM 6.        OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON
Not Applicable

ITEM 7.        IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
               ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING
               COMPANY OR CONTROL PERSON
Not Applicable

ITEM 8.        IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP
Not Applicable

ITEM 9.        NOTICE OF DISSOLUTION OF GROUP
Not Applicable




ITEM 10.       CERTIFICATION
By signing below, each of D. E. Shaw Valence Portfolios, L.L.C., D. E. Shaw &
Co., L.P., and David E. Shaw certify that, to the best of such reporting
person's knowledge and belief, the securities referred to above were not
acquired and are not held for the purpose of or with the effect of changing or
influencing the control of the issuer of the securities and were not acquired
and are not held in connection with or as a participant in any transaction
having such purposes or effect.




SIGNATURE
After reasonable inquiry and to the best of their knowledge and belief, the
undersigned certify that the information set forth in this statement is true,
complete and correct. A Power of Attorney, dated February 24, 2004, granted by
David E. Shaw in favor of Eric Wepsic, is attached hereto.

Dated: February 3, 2006

                                       D. E. Shaw Valence Portfolios, L.L.C.
                                       By: D. E. Shaw & Co., L.P.,
                                       as managing member

                                         By: /s/ Eric Wepsic
                                             -------------------------------
                                             Eric Wepsic
                                             Managing Director


                                       D. E. Shaw & Co., L.P.

                                         By: /s/ Eric Wepsic
                                             -------------------------------
                                             Eric Wepsic
                                             Managing Director



                                       David E. Shaw

                                         By: /s/ Eric Wepsic
                                             -------------------------------
                                             Eric Wepsic
                                             Attorney-in-Fact for David E. Shaw












                                    EXHIBIT 1
                                    ---------

                                POWER OF ATTORNEY
                               FOR CERTAIN FILINGS
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934


I, David E. Shaw, hereby make, constitute and appoint each of:


         Anne Dinning,

         Julius Gaudio,

         Lou Salkind,

         Stuart Steckler, and

         Eric Wepsic,

acting individually, as my agent and attorney-in-fact, with full power of
substitution, for the purpose of, from time to time, executing in my name and/or
my capacity as President of D. E. Shaw & Co., Inc. (acting for itself or as the
general partner of D. E. Shaw & Co., L. P. and general partner or managing
member of other entities, any which in turn may be acting for itself or other
entities) all documents, certificates, instruments, statement, other filings,
and amendments to the forgoing (collectively, "documents") determined by such
person to be necessary or appropriate to comply with ownership or control-person
reporting requirements imposed by any United States or non-United States
governmental or regulatory authority, including without limitation Forms 3, 4,
5, 13D, 13F, and 13G required to be filed with the Securities and Exchange
Commission; and delivering, furnishing or filing any such documents with the
appropriate governmental or regulatory authority. Any such determination shall
be conclusively evidenced by such person's execution, delivery, furnishing,
and/or filing of the applicable document.

This power of attorney shall be valid from the date hereof and replaces the
power granted on February 5, 2001, which is hereby cancelled.

IN WITNESS HEREOF, I have executed this instrument as of the date set forth
below.

Date: February 24, 2004

DAVID E. SHAW, as President of
D. E. Shaw & Co., Inc.
/s/David E. Shaw
New York, New York







                                    EXHIBIT 2
                                    ---------

                             JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934,
as amended, each of the undersigned Reporting Persons hereby agrees to the joint
filing, along with all other such Reporting Persons, on behalf of each of them
of a statement on Schedule 13G (including amendments thereto) with respect to
the Common Stock, $0.01 par value, of NRG Energy, Inc., and that this Agreement
be included as an Exhibit to such joint filing. This Agreement may be executed
in any number of counterparts, all of which taken together shall constitute one
and the same instrument.

IN WITNESS WHEREOF, each of the undersigned hereby executes this Agreement as of
this 3rd day of February, 2006.


                                      D. E. Shaw Valence Portfolios, L.L.C.
                                      By: D. E. Shaw & Co., L.P.,
                                      as managing member

                                          By: /s/ Eric Wepsic
                                              ----------------------------
                                              Eric Wepsic
                                              Managing Director

                                      D. E. Shaw & Co., L.P.

                                          By: /s/ Eric Wepsic
                                              ----------------------------
                                              Eric Wepsic
                                              Managing Director



                                      David E. Shaw

                                          By: /s/ Eric Wepsic
                                              ----------------------------
                                              Eric Wepsic
                                              Attorney-in-Fact for David E. Shaw