the plant your remembering in Dayton was razed a long time ago. The Aberdeen plant is along the Ohio river. As I remember it was built initially as a nuke plant but got too much grief and remade a coal plant.
I just remember that Dayton plant was startlingly huge at first sight, at least to this then 19-year old. :)
The one that was somewhat recently demolished downtown was closer to Downtown, across from Sinclair Community College.