PARIS, May 15 /PRNewswire-FirstCall/ -- In compliance with regulation, SUEZ informed the Comision Nacional del Mercado de Valores** (CNMV) that it completed the acquisition of 4.55% of Gas Natural's share capital in 2007 and that it now holds 9.95% of the share capital of the company. SUEZ also informed it entered into an agreement to secure the acquisition of an additional 1.35% stake. SUEZ will therefore control 11.3% of Gas Natural's share capital, provided the Comision Nacional de Energia* (CNE) grants its authorization for SUEZ to raise its stake over 10%. At December 31, 2006, SUEZ already held a 5.4% stake in Gas Natural (5% via Hisusa which it controls and 0.4 % owned directly by SUEZ). SUEZ investment in Gas Natural, Spain's gas market leader, is in line with the Group strategy to expand dynamically in the European energy and environment markets. * Regulatory body for Spain's energy systems. ** Agency in charge of supervising and inspecting the Spanish Stock Markets and the activities of all the participants in those markets. SUEZ, an international industrial Group, designs sustainable and innovative solutions for the management of public utility services as a partner of public authorities, businesses and individuals. The Group aims to meet essential needs in electricity, natural gas, energy services, water and waste management. SUEZ is listed on the Brussels, Luxembourg, Paris, New York and Zurich stock exchanges and is represented in the major international indices: CAC 40, BEL 20, DJ STOXX 50, DJ EURO STOXX 50, Euronext 100, FTSE Eurotop 100, MSCI Europe and ASPI Eurozone. Disclaimer This press release contains certain forward-looking statements, particularly with respect to future events, trends, plans or objectives. These statements are based on management's current views and assumptions and involve a number of risks and uncertainties that may lead to a significant difference between actual results and those suggested either explicitly or implicitly in these statements (or suggested by past results). Additional information about these risks and uncertainties appears in documents filed by SUEZ with the U.S. Securities and Exchange Commission and the Autorite des Marches Financiers (French securities regulator). The present forward-looking statements are made as of the date of the present release, with no undertaking by SUEZ to update or revise them, whether in connection with new information, future events, or any other factor. Press Contacts: Analyst Contacts: France: +33-1-4006-6651/6668 +33-1-4006-6489 Belgium: +32-2-510-76-70 This release is also available on the Internet: http://www.suez.com/ DATASOURCE: SUEZ CONTACT: Press Contacts: France: +33-1-4006-6651/6668; Belgium: +32-2-510-76-70; Analyst Contacts: France: +33-1-4006-6489

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