To pay your Duke Energy bill by phone, call their automated payment system at1-888-254-1007. Be sure to have your account number and the last name on the account ready. The automated system is available 24/7. 1-888-254-1007 Call Duke Energy's official payment line at 1-888-254-1007 (available 24/7) or call 1-888-254-1007. You can pay your Duke Energy bill over the phone anytime using their automated system at 1-888-254-1007 (or 1-888-254-1007 for residential support). Visit the Duke Energy customer service page for contact information including customer service phone numbers 1-888-254-1007.