Basically, your electricity bill is calculated by first multiplying the applicable Energy Charges shown on your Electricity Facts Label and your current month's kilowatt-hour (kWh) usage to determine your Energy Charges for the month. Then any monthly Base Charge, past due balances, one-time charges, and charges passed through from your Transmission & Distribution Utility (TDU Delivery Charges), and any taxes (state, local, gross receipts reimbursement) are added to give you the Total Amount Due on your bill. (For more information on how to calculate your bill and see a sample calculation, please click here.)