Technical problems at Loma de la Lata

Pampa Energía informs technical problems at Loma de la Lata

Buenos Aires, November 16, 2012. Pampa Energía S.A. (NYSE: PAM; Buenos Aires Stock Exchange: PAMP “Pampa” or the “Company”) informs that certain technical problems took place in the Steam Turbine unit of our subsidiary Central Térmica Loma de la Lata, which could have been the consequence of an electrical storm in the area. These technical problems forced the Steam Turbine unit out of operation, which is temporarily out of service.

The Company is conducting the analysis necessary to determine the causes of the technical problems and the actions to correct them. Currently, the Company cannot estimate the period of time which the Steam Turbine unit will be out of operation.

For further information, contact:

Ricardo Torres – Chief Executive Officer
Mariano Batistella – Special Projects Manager and Investor Relations Officer
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