Technical faults in LLL steam turbine

For Immediate Release

Pampa Energía informs technical fault in the Steam Turbine at Loma de La Lata Power Plant

Buenos Aires, February 18, 2011. Pampa Energía S.A. (NYSE: PAM; Buenos Aires Stock Exchange: PAMP) (“Pampa” or the “Company”), informs that due to some technical faults detected in the Steam Turbine unit, which composes part of Central Térmica Loma de la Lata S.A.‘s installed capacity expansion project, the commissioning for the commercialization of the combined cycle has been postponed. while neither the necessary studies to determine the precise causes of the technical faults nor the actions needed to resolve them have been concluded, it is estimated that the comercialization will be able to occur between the next 60 to 90 days, approximately.

Pampa Energía is the largest integrated electricity company in Argentina that, through its subsidiaries, participates in the generation, transmission and distribution of electricity.

For further information, contact:

Ricardo Torres – Chief Executive Officer
Mariano Batistella – Strategic Planning and Investor Relations
3302 Ortiz de Ocampo, Building #4
(C1425DSR) Ciudad Autónoma de Buenos Aires, Argentina
Phone: 5411 4809 9500
http://www.pampaenergia.com/ir
investor@pampaenergia.com