Acquisition of Petrobras – Signature of SPA

Acquisition of Petrobras Argentina S.A. – Signature of Sale and Purchase Agreement

Buenos Aires, May 12, 2016. Pampa Energía S.A. (‘Pampa’ or the ‘Company’; NYSE: PAM; Buenos Aires Stock Exchange: PAMP) is pleased to inform that, after obtaining the corporate approvals of the Company and of Petróleo Brasileiro S.A. regarding the final terms and conditions for the acquisition by Pampa of the total capital and voting stock of Petrobras Participaciones S.L., owner of 67,1933% of the capital and voting stock of Petrobras Argentina S.A. (‘Petrobras Argentina’) (the ‘Transaction’), on this date we have executed the sale and purchase agreement (‘Sale and Purchase Agreement’ or ‘SPA’), as well as all its exhibits and supporting documents (the ‘Transaction Documents’).

Therefore, and pursuant to the terms and conditions of the SPA, the Company has transferred 20% of the Base Price (US$892 million), which amounts to US$178.4 million, to an escrow account opened at Citigroup Citibank, N.A.

For further information, contact:

Gustavo Mariani – Co-Chief Executive Officer
Ricardo Torres – Co-Chief Executive Officer
Mariano Batistella – Special Projects Manager and Investor Relations Officer
Lida Wang – Chief of Investor Relations

3302 Ortiz de Ocampo, Building #4
(C1425DSR) Ciudad Autónoma de Buenos Aires, Argentina
Phone: +54 (11) 4809 9500
http://www.pampaenergia.com/ir
investor@pampaenergia.com