Stake Interest Assignment to Petrobras Brazil

Assignment of Stake Interest in Río Neuquén and Colpa and Caranda Blocks

Buenos Aires, October 28, 2016. Pampa Energía S.A. (‘Pampa’ or the ‘Company’; NYSE: PAM; BCBA: PAMP) through its subsidiary Petrobras Argentina S.A. (‘Petrobras’) informs that yesterday Petrobras Operaciones S.A., an affiliated company of Petróleo Brasileiro S.A., accepted the offer of assignment from Petrobras of 33.6% of Petrobras’ interest in ‘Río Neuquén’ block and 100% of the rights and obligations under the Operating Agreement entered into by Petrobras Argentina Bolivia Branch and Yacimientos Petrolíferos Fiscales Bolivianos related to Colpa and Caranda blocks in Bolivia.

For further information, contact:

Gustavo Mariani – Vice-President and Co-Chief Executive Officer
Ricardo Torres – Vice-President and Co-Chief Executive Officer
Mariano Batistella – Planning, Strategy and Related Companies Executive Director
Lida Wang – Investor Relations Officer

Maipú 1, (C1084ABA), Buenos Aires, Argentina
Phone: +54 (11) 4344 6000
http://www.pampaenergia.com/ir
investor@pampaenergia.com