Citi Appointed Depositary for ISAGEN’s Level 1 Sponsored ADR Program

Citi today announced that its Global Transaction Services business, acting through Citibank, N.A., has been appointed by ISAGEN S.A. E.S.P. (“ISAGEN”), a Colombia-based mixed public utility corporation, as depositary for its Level 1 American Depositary Receipt program. ISAGEN’s shares will trade on the OTC market under the symbol ISAGY. Each ISAGEN American depositary share represents 10 ordinary shares.

Juan Fernando Vásquez Velásquez, Chief Financial Officer of ISAGEN, said, “We are excited to launch our sponsored ADR program. ISAGEN is committed to increasing its international exposure, and we look forward to heightening our visibility and broadening our investor base worldwide, with Citi as our depositary bank.”

Dirk Jones, Global Head of Securities and Fund Services Client Sales Management at Citi, said, “We’re delighted that ISAGEN has chosen Citi as depositary bank for its Level 1 ADR. Citi’s extensive experience in Latin America lends us a broad understanding of the needs of clients in this market, and allows us to most effectively assist ISAGEN in expanding its global profile, thereby increasing investor awareness and visibility for its program worldwide.”

For more information on Citi’s Depositary Receipt Services, visit www.citi.com/dr.

Global Transaction Services, a division of Citi’s Institutional Clients Group, offers integrated cash management, trade, and securities and fund services to multinational corporations, financial institutions and public sector organizations around the world. With a network that spans more than 100 countries, Citigroup’s Global Transaction Services supports over 65,000 clients. As of the third quarter of 2011, it held on average $365 billion in liability balances and over $12.5 trillion in assets under custody.

About ISAGEN

ISAGEN, incorporated as a public company, is a mixed public utility corporation affiliated with the Ministry of Mining and Energy of Colombia. Its main objective is the generation and commercialization of electric energy. ISAGEN provides services primarily in electric energy, gas supply and energy solutions (maintenance, expansion and energy efficiency). ISAGEN’s operations are conducted in Colombia, and expansion to other countries is currently being assessed. Additional information can be found at www.isagen.com.

About Citi

Citi, the leading global financial services company, has approximately 200 million customer accounts and does business in more than 160 countries and jurisdictions. Citi provides consumers, corporations, governments and institutions with a broad range of financial products and services, including consumer banking and credit, corporate and investment banking, securities brokerage, transaction services, and wealth management.

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