6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN ISSUER
PURSUANT TO RULE 13a-16 OR 15d-16 UNDER

SECURITIES EXCHANGE ACT OF 1934

For the month of October, 2017

(Commission File No. 001-34429),

PAMPA ENERGIA S.A.
(PAMPA ENERGY INC.)

Argentina

(Jurisdiction of incorporation or organization)

Maipú 1
C1084ABA
City of Buenos Aires
Argentina

(Address of principal executive offices)

(Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.)

Form 20-F ___X___ Form 40-F ______

(Indicate by check mark whether the registrant by furnishing the
information contained in this form is also thereby furnishing the
information to the Commission pursuant to Rule 12g3-2(b) under
the Securities Exchange Act of 1934.)

Yes ______ No ___X___

(If "Yes" is marked, indicate below the file number assigned to the
registrant in connection with Rule 12g3-2(b): 82- .)

This Form 6-K for Pampa Energía S.A. (“Pampa” or the “Company”) contains:

Exhibit 1:  Letter dated October 20, 2017, addressed to the National Securities Commission (Comisión Nacional de Valores) and Buenos Aires Stock Exchange (Bolsa de Comercio de Buenos Aires), entitled “Relevant Event – Guarantee of Pampa Energía S.A. granted to a loan agreement entered between Greenwind S.A. and the IIC for Corti Wind Farm Project."

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: October 18, 2017

Pampa Energía S.A.
By:	/s/ Marcos Marcelo Mindlin
	Name: Marcos Marcelo Mindlin Title:   Chief Executive Officer

FORWARD-LOOKING STATEMENTS

This press release may contain forward-looking statements. These statements are statements that are not historical facts, and are based on management's current view and estimates offuture economic circumstances, industry conditions, company performance and financial results. The words "anticipates", "believes", "estimates", "expects", "plans" and similar expressions, as they relate to the company, are intended to identify forward-looking statements. Statements regarding the declaration or payment of dividends, the implementation of principal operating and financing strategies and capital expenditure plans, the direction of future operations and the factors or trends affecting financial condition, liquidity or results of operations are examples of forward-looking statements. Such statements reflect the current views of management and are subject to a number of risks and uncertainties. There is no guarantee that the expected events, trends or results will a ctually occur. The statements are based on many assumptions and factors, including general economic and market conditions, industry conditions, and operating factors. Any changes in such assumptions or factors could cause actual results to differ materially from current expectations.

EX-1

Buenos Aires, October 20, 2017

Bolsas y Mercados Argentinos S.A.

Comisión Nacional de Valores

Ref.: Relevant Event – Guarantee of Pampa Energía S.A. granted to a loan agreement entered between Greenwind S.A. and the IIC for Corti Wind Farm Project.

Dear Sirs,

I am writing to the National Securities Commission (“Comisión Nacional de Valores”) and Bolsas y Mercados Argentinos S.A. (“ByMA”) in my capacity as Head of Market Relations of Pampa Energía S.A. (“Pampa”) in order to inform that Greenwind S.A. (“Greenwind”), an affiliate of Pampa, signed a loan agreement with the Inter-American Investment Corporation (“IIC”), member of the Inter-American Development Bank Group (“IDB Group”) and as participants Banco Santander S.A. and the Industrial and Commercial Bank of China Limited Dubai (DIFC) Branch, for the amount of US$104,000,000 (the “Loan Agreement”). Pampa granted a personal guarantee to the Loan Agreement.

The net proceeds from the Loan Agreement will be used to build, operate and maintain Corti Wind Farm Project located in Bahía Blanca, province of Buenos Aires, Argentina. This project is being developed within Renovar 1 public tender and its commissioning is expected for the first half of 2018.

Sincerely,

_________________________________

María Agustina Montes

Head of Market Relations