SINGAPORE (Standard&Poor's CreditWire) April 28, 2000--Standard&Poor's today affirmed its triple-'B'-minus long-term foreign and local currency ratings and senior unsecured issue ratings on PTT Exploration and Production Public Co. Ltd. (PTTEP). The outlook on the ratings is stable. The guaranteed US$200 million issue of PTTEP International Ltd. also is affirmed at triple-'B'-minus. PTTEP has a high non-investment grade credit quality on a stand-alone basis. This reflects the company's solid asset base and competitive position in the oil and gas industry, offset by its dependence on domestic gas revenues, reliance on a single customer and on one of its fields in particular, and a moderately aggressive financial profile. PTTEP's credit quality is enhanced by the company's key public