CTEEP Annoucement to the market

Debt management operations

Financial Results Third Quarter 2012

The Ministry of Finance and Public Credit, by Resolutions 3340 of October 30th, 2012 authorized ISA S.A. E.S.P. to enter into an internal loan agreement

CTEEP Annoucement to the market

Transelca Relevant Information

CTEEP’s Relevant Information

Relevant Information Shareholder Meeting

Relevant Information Brazil Concesions

The ratings of ISA reflect its strong financial profile, characterized by stable and predictable cash flows, comfortable liquidity levels and adequate debt coverage indicators.

Standard and Poor´s release, which has affirmed the BBB

ISA retransmitted the 2009 Código País Survey

Payment was decreed at 2010 Regular Assembly of Shareholders

At regular meeting 703 of January 28, 2011, ISA’s Board of Directors authorized the management to:

Compliance with Resolution 116 of 2002