NEW YORK (Standard&Poor's CreditWire) Feb. 19, 1999--Standard&Poor's today affirmed its ratings on Duke Energy Corp. and its affiliates (see list below). The outlook remains stable except for Panhandle Eastern Pipe Line Co., which remains on CreditWatch with negative implications pending its sale to CMS Energy Corp., and Duke Energy Trading and Marketing LLC, which remains on CreditWatch with positive implications pending the merger of Mobil Corp. and Exxon Corp. This affirmation reflects Duke's $2 billion tender offer for a controlling interest in Empresa Nacional de Electricidad S.A. (Endesa Chile; A-/Stable/--), which controls more than 10,000MW of generation capacity in Latin America. It also anticipates that Duke will issue, in the next 12 months, about $1 billion