Delmarva Power & Light Co. said March 29 it has begun to automatically provide the final round of a $50 rate credit to its Maryland residential customer accounts.

"We're excited to provide our customers with their second bill credit as a result of our merger with Exelon," Delmarva Power Region President Gary Stockbridge said in a news release.

Maryland customers have so far received credits totaling more than $17 million as a result of the Exelon Corp. and Pepco Holdings LLC merger, and they received the first rate credit in April 2016.