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{\*\bkmkstart filing_1}{\*\bkmkend filing_1}{\*\bkmkstart doc_1_1}{\*\bkmkend doc_1_1}\par\pard\plain\ul{\field{\*\fldinst HYPERLINK \\l "toc" }{\*\fldrslt\cf3\f52\fs16\b\ql Table of Contents}}\par\pard\plain\brdrb\brdrs\cf1\f51\fs2\ql \~\par\pard\plain\brdrb\brdrs\cf1\f51\fs2\ql \~\par\pard\plain\sb264\cf1\f51\fs28\b\qc UNITED STATES
\par\pard\plain\fs16\pard\plain\cf1\f51\fs28\b\qc SECURITIES AND EXCHANGE COMMISSION\par\pard\plain\cf1\f51\fs24\b\qc WASHINGTON, D.C. 20549\par\pard\plain\sb352\cf1\f51\fs6\b\qc \~\par\pard\plain\sb264\cf1\f51\fs36\b\qc SCHEDULE 14D-9\par\pard\plain\sb352\cf1\f51\fs6\b\qc \~\par\pard\plain\sb264\cf1\f51\fs24\b\qc Solicitation/Recommendation Statement
\par\pard\plain\fs16\pard\plain\cf1\f51\fs24\b\qc Under Section\~14(d)(4) of the Securities Exchange Act of 1934
\par\pard\plain\fs16\pard\plain\cf1\f51\fs24\b\qc (Amendment No.\~13)\par\pard\plain\sb352\cf1\f51\fs6\b\qc \~\par\pard\plain\sb264\cf1\f51\fs28\b\qc NRG Energy, Inc.\par\pard\plain\cf1\f51\fs20\qc (Name of Subject Company)\par\pard\plain\sb352\cf1\f51\fs6\qc \~\par\pard\plain\sb264\cf1\f51\fs28\b\qc NRG Energy, Inc.\par\pard\plain\cf1\f51\fs20\qc (Name of Person Filing Statement)\par\pard\plain\sb352\cf1\f51\fs6\qc \~\par\pard\plain\sb264\cf1\f51\fs20\b\qc Common Stock, par value $0.01 per share
\par\pard\plain\fs16\pard\plain\cf1\f51\fs20\qc (Title of Class of Securities)\par\pard\plain\sb264\cf1\f51\fs20\b\qc 629377508
\par\pard\plain\fs16\pard\plain\cf1\f51\fs20\qc (CUSIP Number of Class of Securities)\par\pard\plain\sb264\cf1\f51\fs20\b\qc J. Andrew Murphy
\par\pard\plain\fs16\pard\plain\cf1\f51\fs20\b\qc Executive Vice President and General Counsel
\par\pard\plain\fs16\pard\plain\cf1\f51\fs20\b\qc NRG Energy, Inc.
\par\pard\plain\fs16\pard\plain\cf1\f51\fs20\b\qc 211 Carnegie Center
\par\pard\plain\fs16\pard\plain\cf1\f51\fs20\b\qc Princeton, New Jersey 08540
\par\pard\plain\fs16\pard\plain\cf1\f51\fs20\b\qc (609)\~524-4500
\par\pard\plain\fs16\pard\plain\cf1\f51\fs20\qc (Name, address and telephone number of person authorized to receive
\par\pard\plain\fs16\pard\plain\cf1\f51\fs20\qc notices and communications on behalf of the persons filing statement)\par\pard\plain\sb352\cf1\f51\fs6\qc \~\par\pard\plain\sb264\cf1\f51\fs20\b\i\qc With copies to:\par\pard\plain\sb264\cf1\f51\fs20\b\qc Stephen Fraidin
\par\pard\plain\fs16\pard\plain\cf1\f51\fs20\b\qc Thomas W. Christopher
\par\pard\plain\fs16\pard\plain\cf1\f51\fs20\b\qc Kirkland & Ellis LLP
\par\pard\plain\fs16\pard\plain\cf1\f51\fs20\b\qc 153 East 53rd Street
\par\pard\plain\fs16\pard\plain\cf1\f51\fs20\b\qc New York, New York 10022
\par\pard\plain\fs16\pard\plain\cf1\f51\fs20\b\qc (212)\~446-4800\par\pard\plain\sb352\cf1\f51\fs6\qc \~
\par\pard\plain
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\pard\plain\intbl\cf1\f51\fs20\ql \~\cell\pard\plain\intbl\cf1\f54\fs20\ql o\plain\intbl\cf1\f51\fs20\ql  Check the box if the filing relates solely to preliminary communications made before the commencement of a tender offer.\cell{
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\page\par\pard\plain\cf1\f51\fs20\b\ul\qc TABLE OF CONTENTS
\par\pard\plain
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\page\par\pard\plain\f0\fs16\pard\plain\ul{\field{\*\fldinst HYPERLINK \\l "toc" }{\*\fldrslt\cf3\f51\fs16\b\ql Table of Contents}}\par\pard\plain\sb132\cf1\f51\fs20\ql \~\~\~\~\~This Amendment No.\~13 to Schedule\~14D-9 amends and supplements the Solicitation/Recommendation Statement on\plain\cf1\f51\fs20\ql  Schedule\~14D-9 (the\plain\cf1\f51\fs20\i\ql   \u8220?Statement\u8221?\plain\cf1\f51\fs20\ql  ) originally filed by NRG Energy, Inc., a Delaware corporation\plain\cf1\f51\fs20\ql  (\plain\cf1\f51\fs20\i\ql  \u8220?NRG\u8221?\plain\cf1\f51\fs20\ql  ), with the Securities and Exchange Commission on November\~24, 2008, relating to the unsolicited offer by\plain\cf1\f51\fs20\ql  Exelon Corporation, a Pennsylvania corporation (\u8220?Exelon\u8221?), through its wholly-owned subsidiary, Exelon Xchange\plain\cf1\f51\fs20\ql  Corporation, a Delaware corporation, to exchange each outstanding share of common stock of NRG, par value $0.01 per share\plain\cf1\f51\fs20\ql  (\plain\cf1\f51\fs20\i\ql  \u8220?NRG Common Stock\u8221?\plain\cf1\f51\fs20\ql  ), for 0.485 of a share of Exelon common stock, without par value, upon the terms and\plain\cf1\f51\fs20\ql  subject to the conditions set forth in (1)\~the Preliminary Prospectus/Offer to Exchange, dated November\~12, 2008, as amended on\plain\cf1\f51\fs20\ql  December\~23, 2008 (as so amended, the \u8220?Exchange Offer\u8221?) and (2)\~the related Letter of Transmittal (which, together\plain\cf1\f51\fs20\ql  with the Exchange Offer and any amendments or supplements thereto from time to time, collectively constitutes the\plain\cf1\f51\fs20\ql  \u8220?Offer\u8221?). Capitalized terms used but not defined herein have the meanings ascribed to them in the Statement. Except\plain\cf1\f51\fs20\ql  as otherwise noted, the information set forth in the original Statement remains unchanged.{\*\bkmkstart gmnh000}{\*\bkmkend gmnh000}\par\pard\plain\sb264\cf1\f51\fs20\b\ql Item\~9. Exhibits.\par\pard\plain\sb132\cf1\f51\fs20\ql \~\~\~\~\~Item\~9 is hereby amended and supplemented by adding the following exhibits:
\par\pard\plain
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\pard\plain\intbl\cf1\f51\fs16\b\ql No.\cell\pard\plain\intbl\cf1\f51\fs16\ql \~\cell\pard\plain\intbl\cf1\f51\fs16\b\ql Description\cell{
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\pard\plain\intbl\cf1\f51\fs20\ql (a)(14)\cell\pard\plain\intbl\cf1\f51\fs20\ql \~\cell\pard\plain\intbl\cf1\f51\fs20\ql Employee Letter dated February\~16, 2009\cell{
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\par\pard\plain
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\pard\plain\intbl\cf1\f51\fs20\ql *\cell\pard\plain\intbl\cf1\f51\fs20\ql \~\cell\pard\plain\intbl\cf1\f51\fs20\ql Incorporated herein by reference to NRG\u8217?s 425 filing with the SEC on February\~16, 2009.\cell{
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\page\par\pard\plain\f0\fs16\par\pard\plain\ul{\field{\*\fldinst HYPERLINK \\l "toc" }{\*\fldrslt\cf3\f52\fs16\b\ql Table of Contents}}{\*\bkmkstart gmnh001}{\*\bkmkend gmnh001}\par\pard\plain\sb396\cf1\f51\fs20\b\qc SIGNATURE\par\pard\plain\sb132\cf1\f51\fs20\ql \~\~\~\~\~After due inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true,\plain\cf1\f51\fs20\ql  complete and correct.
\par\pard\plain
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\pard\plain\intbl\cf1\f51\fs20\ql \~\cell\pard\plain\intbl\cf1\f51\fs20\b\ql NRG ENERGY, INC.
\par\pard\plain\intbl\fs16\pard\plain\intbl\cf1\f51\fs20\ql \~\cell\pard\plain\intbl\cf1\f51\fs20\ql \~\cell{
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\pard\plain\intbl\cf1\f51\fs20\ql \~\cell\pard\plain\intbl\cf1\f51\fs20\ql By:\~\~\cell\pard\plain\intbl\cf1\f51\fs20\ql /s/ J. Andrew Murphy \~\cell\pard\plain\intbl\cf1\f51\fs20\ql \~\cell{
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\pard\plain\intbl\cf1\f51\fs20\ql \~\cell\pard\plain\intbl\cf1\f51\fs20\ql \~\cell\pard\plain\intbl\cf1\f51\fs20\ql Name:\~\~\cell\pard\plain\intbl\cf1\f51\fs20\ql J. Andrew Murphy\~\cell\pard\plain\intbl\cf1\f51\fs20\ql \~\cell{
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\pard\plain\intbl\cf1\f51\fs20\ql \~\cell\pard\plain\intbl\cf1\f51\fs20\ql \~\cell\pard\plain\intbl\cf1\f51\fs20\ql Title:\~\~\cell\pard\plain\intbl\cf1\f51\fs20\ql Executive Vice President and
\par\pard\plain\intbl\fs16\pard\plain\intbl\cf1\f51\fs20\ql General Counsel\~\cell\pard\plain\intbl\cf1\f51\fs20\ql \~\cell{
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\pard\plain\intbl\cf1\f51\fs20\ql \~\cell{
{\trowd\clvertalc\cellx10800\trrh248\row}}}\pard\plain\sb264\cf1\f51\fs20\ql Dated: February\~17, 2009\par\pard\plain\cf1\f51\fs20\qc 3}