Unassociated Document

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 1)

Empresa Distribuidora y Comercializadora Norte S.A. (EDENOR)

(Distribution and Marketing Company of the North)

(Name of Issuer)

American Depositary Shares (“ADSs”), each representing 20 Class B Shares (“Class B Shares”)

(Title of Class of Securities)

N/A

(CUSIP Number)

Romina Benvenuti

Ortiz de Ocampo 3302

Building #4

C1425DSR

Buenos Aires

Argentina

Tel: 54 11 4809 9520

(Name, Address and Telephone Number of Person

Authorized to Receive Notices and Communications)

November 1, 2010

(Date of Event which Requires Filing of this Statement)

If the Reporting Person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d -1(e), 240.13d -1(f) or 240.13d -1(g), check the following box. o

Note. Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See §240.13d -7 for other parties to whom copies are to be sent.

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 disclosures provided in a prior cover page.

The information required on 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).

(Continued on following pages)

CUSIP No. N/A

13D

Page 2 of 5 Pages

1	NAMES OF REPORTING PERSONS Pampa Inversiones S.A.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP	(a) (b)	o o
3	SEC USE ONLY
4	SOURCE OF FUNDS N/A
5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e)		o
6	CITIZENSHIP OR PLACE OF ORGANIZATION Uruguay

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER -0-
	8	SHARED VOTING POWER 39,041,835
	9	SOLE DISPOSITIVE POWER -0-
	10	SHARED DISPOSITIVE POWER 39,041,835

11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 39,041,835
12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES	o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11 8.8%
14	TYPE OF REPORTING PERSON HC - CO

Page 2 of 5 Pages

CUSIP No. N/A

13D

Page 3 of 5 Pages

1	NAMES OF REPORTING PERSONS Pampa Energia S.A. (Pampa Energy Inc.)
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP	(a) (b)	o o
3	SEC USE ONLY
4	SOURCE OF FUNDS (see instructions) N/A
5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e)		o
6	CITIZENSHIP OR PLACE OF ORGANIZATION Argentina

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 39,041,835
	8	SHARED VOTING POWER -0-
	9	SOLE DISPOSITIVE POWER 39,041,835
	10	SHARED DISPOSITIVE POWER -0-

11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 39,041,835
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES	o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11 8.8%
14	TYPE OF REPORTING PERSON HC - CO

Page 3 of 5 Pages

This Amendment No. 1 amends and supplements the Schedule 13D filed by Pampa Inversiones S.A. (“PISA”) and Pampa Energía S.A. (“Pampa Energía”) with the Securities and Exchange Commission on September 28, 2010 (the “Schedule 13D”), related to the American Depository Shares (“ADSs”), each representing 20 Class B Shares (“Class B Shares”) of Empresa Distribuidora y Comercializadora Norte S.A. (Edenor), an Argentina sociedad anonima (the “Company”).

Items 4 and 5 of the Schedule 13D are hereby amended and restated, as follows:

Item 4. Purpose of Transaction.

Pampa Energía has caused its subsidiary PISA to sell Shares of the Issuer to take advantage of favorable market conditions.

Item 5. Interest in Securities of the Issuer.

(a) and (b). The Reporting Persons have, as of November 5, 2010, the following interests in the Shares:

	Shares Beneficially Owned	% of Class	Sole Power to Vote	Shared Power to Vote	Sole Power to Dispose	Shared Power to Dispose
PISA	39,041,835	8.8%	-0-	39,041,835	-0-	39,041,835
Pampa Energía	39,041,835	8.8%	39,041,835	-0-	39,041,835	-0-

To the knowledge of the Reporting Persons, none of the executive officers or directors of each of PISA and Pampa Energía owns any Shares with the exception of Gustavo Mariani, a director of Pampa Energía, who owns 640,000 Class B Shares, or 0.1% of the Shares, and has the sole power to vote and dispose of these 640,000 Class B Shares.

(c) In the past sixty days, PISA has effected the following transactions in the Class B Shares through brokers on the Bolsa de Comercio de Buenos Aires (Buenos Aires Stock Exchange):

Date of Transaction	Shares Sold	Price per Share (Ps.)	Broker
November 2, 2010	404,688	Ps. 2.2128	Allaria Ledesma Soc. de Bolsa

In the past sixty days, PISA has effected the following transactions in the ADSs through brokers on the New York Stock Exchange:

Date of Transaction	ADSs Sold	Equivalent Number of Shares	Price per ADSs (U.S. dollars)	Broker
September 28, 2010	35,000	700,000	U.S. $8.0198	JP Morgan Sec.
October 27, 2010	123,275	2,465,500	U.S. $11.7215	JP Morgan Sec.
November 1, 2010	155,100	3,102,000	U.S. $10.8878	JP Morgan Sec.
November 2, 2010	105,680	2,113,600	U.S. $11.1098	JP Morgan Sec.
November 3, 2010	37,085	741,700	U.S. $10.9303	JP Morgan Sec.
November 4, 2010	57,490	1,149,800	U.S. $11.1722	JP Morgan Sec.

Pampa Energia has not and, to the knowledge of the Reporting Persons, Gustavo Mariana has not, effected any transactions in the Shares or ADSs in the past sixty days.

Page 4 of 5 Pages

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.

Dated: November 5, 2010

	PAMPA INVERSIONES S.A.

	By: /s/ Ricardo Torres
	Name: Ricardo Torres Title: President

	PAMPA ENERGIA S.A.

	By: /s/ Roberto Maestretti
	Name: Roberto Maestretti Title: Chief Financial Officer

Page 5 of 5 Pages