You can pay your Duke Energy bill on your phone by calling 1-888-254-1007 the automated phone system, using the mobile app, or by making a guest payment through your web browser. Automated Phone System: Call 1-888-254-1007 or (888).254.1007 (available 24/7). Have your account number and payment method (checking account, debit card, or credit card) ready. 1-888-254-1007 You can make a one-time, same-day payment at any time by calling the official Duke Energy Pay Bill automated line. Phone Number Call 1-888-254-1007.