MADRID (Standard&Poor's) April 28, 2006--Standard&Poor's Ratings Services said today that its 'A+' long-term and 'A-1' short-term corporate credit ratings on Spanish utility Gas Natural SDG, S.A. remain on CreditWatch with negative implications, amid recent developments in the competing bidding process for Spanish utility Endesa S.A. (A/Watch Neg/A-1). The ratings were placed on CreditWatch on Sept. 6, 2005, following the company's €22.55 billion bid for a 100% stake in Endesa--viewed as hostile by Endesa's board of directors. On Feb. 21, 2006, German utility E.ON AG (AA-/Watch Neg/A-1+) launched a conditional €29.1 billion all-cash counterbid for up to 100% of Endesa. The bidding process' complexity has increased as a result of events since Standard&Poor's last CreditWatch