Ecopetrol S.A. announced today that the credit rating agency Standard & Poor´s on May 4, 2010, published a report where it reaffirms the corporate risk rating for Ecopetrol at BB+ with a stable outlook.

According to the report, the rating confirmation granted to Ecopetrol reflects, among others, its leadership position in the Colombian hydrocarbon industry, its low production costs and its well-established access to the capital markets.

Similarly, the credit rating agency considers that the Republic of Colombia (which has a credit rating on foreign currency of BB+, stable Outlook) would provide timely and sufficient extraordinary support to Ecopetrol in the event of financial distress, given its fundamental role in the country´s economy. Ecopetrol is the largest company in Colombia and the main supplier of refined products for the local market.

Bogota, May 10, 2010

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Ecopetrol is Colombia´s largest integrated oil company and is among the top 40 oil companies in the world and the four largest oil companies in Latin America. Besides Colombia, where it accounts for 60% of total production, the Company is involved in exploration and production activities in Brazil, Peru and the United States (Gulf of Mexico). Ecopetrol has the principal refineries in Colombia, most of the network of oil and multiple purpose pipelines in the country, and it is considerably increasing its participation in biofuels.

This release contains forward-looking statements relating to the prospects of the business, estimates for operating and financial results, and those related to growth prospects of Ecopetrol. These are merely projections and, as such, are based exclusively on the expectations of management concerning the future of the business and its continued access to capital to fund the Company´s business plan. Such forward-looking statements depend, substantially, on changes in market conditions, government regulations, competitive pressures, the performance of the Colombian economy and the industry, among other factors; therefore, they are subject to change without prior notice.

Contact us for any additional information:

Investor Relations
Alejandro Giraldo
Phone: +571-234-5190
Email: investors@ecopetrol.com.co

Media Relations (Colombia)
Mauricio Téllez
Phone: + 571-2345377
Fax: +571-2344480
Email: mtellez@ecopetrol.com.co

Website: www.ecopetrol.com.co