U.S.–based DPL Inc.'s utility company, Dayton Power&Light Co. (DP&L), recently announced its decision to close certain merchant generating assets on or before June 1, 2018. The company has also agreed to a six-year Electric Security Plan (ESP) settlement proposal that includes the collection of distribution modernization rider (DMR) revenues for years one through three of the term of the ESP. We are lowering our issuer credit ratings on both parent DPL and utility subsidiary DP&L to 'BB-' from 'BB'. The outlook is negative. We are lowering our rating on DPL's senior unsecured debt to 'B+' from 'BB' and revising the recovery rating on this debt to '5' from '4' based on deteriorating value of the merchant power assets