Rising costs in Duke Energy Corp.'s plant construction program and robust competition in Ohio have worsened business risk and limited upward rating momentum. Successful risk management of those developments and steady financial performance will be necessary to maintain ratings stability. We revised the outlook on Charlotte, N.C.-based energy company and its subsidiaries to stable from positive and affirmed its 'A–' corporate credit ratings. NEW YORK (Standard&Poor's) July 23, 2010--Standard&Poor's Ratings Services revised the outlook on Duke to stable from positive. At the same time, we affirmed our ratings, including the 'A-' corporate credit rating, on Duke, sub-holding company Cinergy Corp., and utility subsidiaries Duke Energy Carolinas LLC, Duke Energy Indiana Inc., Duke Energy Kentucky Inc., and
