...+ The Ohio Supreme Court recently issued an opinion that reverses the Public Utilities Commission of Ohio's approval of Dayton Power & Light Co. 's (DP&L) non-bypassable service stability rider. + We are placing our '##' corporate credit ratings on DP&L and parent DPL Inc. on CreditWatch with negative implications. + We are also placing our '##' senior unsecured debt ratings at DPL Inc. and our '###-' first mortgage bond rating on DP&L on CreditWatch with negative implications. + We are revising DPL's recovery rating to '4' from '3', indicative of average recovery (30% to 50%), and mainly reflecting weaker valuation assumptions for merchant generation. + The negative CreditWatch listing reflects the near-term possibility of a ratings downgrade following the Ohio Supreme Court's ruling. NEW YORK (S&P Global Ratings) June 27, 2016--S&P Global Ratings said today it placed its ratings, including the '##' corporate credit rating, on Dayton, Ohio¡based DPL Inc. and subsidiary Dayton Power & Light...