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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No. )*
NRG ENERGY, INC.

(Name of Issuer)

COMMON SHARES

(Title of Class of Securities)

629377508

(CUSIP Number)

October 1, 2004

(Date of Event Which Requires Filing of this Statement)
 
[  ]	Rule 13d-1(b)	
[X]	Rule 13d-1(c)	
[  ]	Rule 13d-1(d)	

CUSIP No. 629377508	 	

	 	
 	1.	Names of Reporting Persons.
I.R.S. Identification Nos. of above persons (entities only).
Orbis Investment Management Limited, Orbis Asset Management Limited	 	

	 	
 	2.	Check the Appropriate Box if a Member of a Group (See Instructions)	 	
 	 	(a)	[X]	 	
 	 	(b)	[ ]	 	

	 	
 	3.	SEC Use Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	 	

	 	
 	4.	Citizenship or Place of Organization
Bermuda, The Reporting Persons are companies organized under the laws of Bermuda. .	 	

	 	
Number of
Shares
Beneficially
Owned by
Each Reporting
Person With	 	 	 	
 	5.	Sole Voting Power 4,888,584	 	 	 	

	 	 	 	 	 	
 	6.	Shared Voting Power 142,300	 	 	 	 	 	 	 	

	 	 	 	 	 	 	 	 	 	
 	7.	Sole Dispositive Power 5,030,884	 	 	 	 	 	 	 	 	 	 	 	

	 	 	 	 	 	 	 	 	 	 	 	 	 	
 	8.	Shared Dispositive Power None	 	 	 	 	 	 	 	 	 	 	 	 	 	 	

	 	 	 	 	 	 	 	 	 	 	 	 	 	 	

 	9.	Aggregate Amount Beneficially Owned by Each Reporting Person.
Orbis Investment Management Limited 4,931,784, Orbis Asset Management Limited 99,100	 	 	 	 	 	 	 	 	 	 	 	 	 	 	

	 	 	 	 	 	 	 	 	 	 	 	 	 	 	

 	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 %	 	 	 	 	 	 	 	 	 	 	 	 	 	 	

	 	 	 	 	 	 	 	 	 	 	 	 	 	 	

 	12.	Type of Reporting Person (See Instructions)	 	 	 	 	 	 	 	 	 	 	 	 	 	 	

	 	 	 	 	 	 	 	 	 	 	 	 	 	 	
CO	 	 	 	 	 	 	 	 	 	 	 	 	 	 	

	 	 	 	 	 	 	 	 	 	 	 	 	 	 	
Item 1.	
 	(a)	Name of Issuer.
COMMON SHARES, NRG ENERGY, INC. .	
 	(b)	Address of Issuer's Principal Executive Offices
901 Marquette Avenue, Suite 2300, Minneapolis Minnesota, USA 55402	
Item 2.	
 	(a)	Name of Person Filing.
Orbis Investment Management Limited, Orbis Asset Management Limited	
 	(b)	Address of Principal Business Office or, if none, Residence
34 Bermudiana Road, Hamilton HM 11, Bermuda	
 	(c)	Citizenship
Bermuda, The Reporting Persons are companies organized under the laws of Bermuda.	
 	(d)	Title of Class of Securities    Common Shares	
 	(e)	CUSIP Number    629377508	
 	
Item 3.	If this statement is filed pursuant to 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:	
 	(a)	[]	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78c).	
 	(b)	[]	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).	
 	(c)	[]	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).	
 	(d)	[]	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-8).	
 	(e)	[]	An investment adviser in accordance with 240.13d-1(b)(1)(ii)(E);	
 	(f)	[]	An employee benefit plan or endowment fund in accordance with 240.13d-1(b)(1)(ii)(F);	
 	(g)	[]	A parent holding company or control person in accordance with 240.13d-1(b)(1)(ii)(G);	
 	(h)	[]	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);	
 	(i)	[]	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);	
 	(j)	[]	Group, in accordance with 240.13d-1(b)(1)(ii)(J).	
 	
Item 4.	Ownership.	
Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.	
 	(a)	Amount beneficially owned:   5,030,884	
 	(b)	Percent of class: 5.0	
 	(c)	Number of shares as to which the person has:	
 	 	(i)	Sole power to vote or to direct the vote    4,888,584	
 	 	(ii)	Shared power to vote or to direct the vote    142,300	
 	 	(iii)	Sole power to dispose or to direct the disposition of    5,030,884	
 	 	(iv)	Shared power to dispose or to direct the disposition of    None	
 	
Item 5.	Ownership of Five Percent or Less of a Class	
If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following   [  ]

Instruction: Dissolution of a group requires a response to this item.	
 	
Item 6.	Ownership of More than Five Percent on Behalf of Another Person.	
Other persons have the right to receive and the power to direct the receipt of dividends from, or the proceeds from the sale of, the common shares NRG ENERGY, INC. beneficially owned by Orbis Investment Management Limited. Another person has the right to receive and the power to direct the receipt of dividends from, or the proceeds from the sale of, the common shares of NRG ENERGY, INC. beneficially owned by Orbis Asset Management Limited.	
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	
Orbis Investment Management Limited ("OIML") and Orbis Asset Management Limited ("OAML") are together making this filing because they may be deemed to constitute a "group" for the purposes of Section 13(d)(3) of the Act. Information with respect to each of OIML and OAML (collectively, the "Reporting Persons") is given solely by each such Reporting Person and no Reporting Person has responsibility for the accuracy or completeness of information supplied by the other Reporting Person. OIML is the beneficial owner of 4,931,784 shares or 4.9% of the 100,006,798 common shares of NRG ENERGY, INC. believed to be outstanding. OIML disclaims beneficial ownership of the 99,100 common shares beneficially owned by OAML. OAML is the beneficial owner of 99,100 shares or 0.1% of the 100,006,798 common shares of NRG ENERGY, INC. believed to be outstanding. OAML disclaims beneficial ownership of the 4,931,784 common shares beneficially owned by OIML.	
Item 9.	Notice of Dissolution of Group	
Not applicable	
Item 10.	Certification	

 	(b)	The following certification shall be included if the statement is filed pursuant to 240.13d-1(c):By signing below I certify that, to the best of my 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 that purpose or effect.	
SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

 	October 4, 2004	
 	Date	
 	 	
 	ORBIS INVESTMENT MANAGEMENT LIMITED ORBIS ASSET MANAGEMENT LIMITED by	
 	Signature	
 	 	
 	James J. Dorr, General Counsel and Secretary	
 	Name/Title	
Attention:	Intentional misstatements or omissions of fact constitute Federal criminal violations
(See 18 U.S.C. 1001)	
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