Gas Natural Extends Expiration Date of Its U.S. Offer for Endesa

NEW YORK, June 16 /PRNewswire/ — Gas Natural SDG, S.A. announced today that the expiration date of its U.S. offer for Endesa, S.A. has been extended to 11:00 a.m., New York City time (5:00 p.m., Madrid time), on July 19, 2006, unless the U.S. offer is further extended, lapses or is withdrawn. Gas Natural’s obligation to complete its U.S. offer is conditioned on, among other conditions, the completion of its Spanish offer. As previously disclosed by Gas Natural, the processing of Gas Natural’s offer in Spain has been temporarily suspended as a result of the injunctions issued by the Court for Business Matters No. 3 in Madrid and the Spanish Supreme Court, pending resolution of Gas Natural’s appeals as well as the underlying lawsuits.

Gas Natural intends to cause the offer periods of its U.S. offer and Spanish offer to end at the same time and will announce any further extensions or any other material modifications to the offers. Except as modified by this extension, the terms and conditions of the U.S. offer remain in effect and unmodified.

Gas Natural’s U.S. offer is open to all holders of Endesa ordinary shares who are located in the United States and to all holders of Endesa ADSs, wherever located. Based on information provided by The Bank of New York, the exchange agent for Gas Natural’s U.S. offer, as of the close of business on June 16, 2006, approximately 935,591.6966 Endesa ADSs and 0 Endesa ordinary shares had been tendered pursuant to the U.S. offer. Holders of Endesa securities may withdraw any Endesa securities tendered pursuant to the U.S. offer at any time prior to the expiration of the U.S. offer.

Gas Natural SDG, S.A.

CONTACT: Bruce Goldfarb or Pat McHugh of Georgeson ShareholderCommunications NY, +1-212-440-9800, for Gas Natural