CHARLOTTE, N.C. (AP) — Duke Energy told shareholders Thursday that cleanup costs resulting from its massive coal ash spill into the Dan River won't have a material effect on the $50 billion company's bottom line. The nation's largest electric company said in a regulatory filing with the U.S. Securities and Exchange Commission that it had spent $15 million so far on plugging the collapsed pipe at its Eden power plant that triggered a Feb.Read more on NewsOK.com