Charges for Residential Service

1 Commonwealth Edison Company Summary of Typical Residential Line Item Charges (Supplemental to the Residential Rate Pamphlet) Effective with January 2017 Billing Period ComEd Charges for Residential Service Residential bills include a Customer Charge, Standard Metering Service Charge, Distribution Facilities Charge, Illinois Electricity Distribution Tax Charge, Environmental Cost Recovery Adjustment, and Charges for Energy Efficiency Programs and Taxes.

2 If fixed price supply is provided by ComEd, a Transmission services Charge, Electricity Supply Charge, and Purchased Electricity Adjustment are also included on the bill. Depending on where you reside, your bill may also include Charges for local government compliance costs and for franchise costs. See the Understanding Your Bill section of the Residential Rate Pamphlet for further explanation of these Charges . For customers in single family homes (Single Family) and that do not have electric space heat Customer Charge (per month) 1, 2 Standard Metering Charge (per month)2 $ Distribution Facilities Charge (per kWh) 2 $ RRTP Customers $ All Others $ For customers where three or more customers are each served through separate meters from a single Service connection such as an apartment building (Multi Family) and that do not have electric space heat Customer Charge (per month) 1, 2 Standard Metering Charge (per month)2 $ Distribution Facilities Charge (per kWh) 2 $ RRTP Customers $ All Others $ For customers that are Single Family and that have electric space heat Customer Charge (per month) 1, 2 Standard Metering Charge (per month)2 $ Distribution Facilities Charge (per kWh)

3 2 $ 2 RRTP Customers $ All Others $ For customers that are Multi Family and that have electric space heat Customer Charge (per month) 1, 2 Standard Metering Charge (per month)2 $ Distribution Facilities Charge (per kWh) 2 $ RRTP Customers $ All Others $ Illinois Electricity Distribution Tax Charge (per kWh)2 .. $ Transmission services Charge (per kWh) 4 .. $ Electricity Supply Charge (for fixed price supply; per kWh) 3, 4 Summer $ All other $ Purchased Electricity Adjustment (per kWh) ..varies by month Environmental Cost Recovery Adjustment (per kWh).. $ Energy Efficiency Programs (per kWh).. $ 1. Customer Charge includes the following for state mandated programs - renewable energy, coal technology, and low income energy assistance, Residential real time pricing program (RRTP) and consolidated billing adjustment where applicable: RRTP Customers $ All Other $ 2.

4 Includes Incremental Distribution Uncollectible Cost Factor (IDUF). 3. Residential Real Time Pricing (RRTP) customers receive electric supply at prices that vary each hour. 4. Includes Incremental Supply Uncollectible Cost Factor (ISUF) and Supply Base Uncollectible Cost Factor (SBUF). Sample Residential Bill (ComEd Supply) 1 Residential -Single Electricity Supply services 2 $ Electricity Supply Charge 800 kWh X Transmission services Charge 800 kWh X Purchased Electricity Adjustment Delivery Service -ComEd $ Customer Charge 3 Standard Metering Charge 4 Distribution Facilities Charge 5 800 kWh X IL Electricity Distribution Charge 800 kWh X Taxes and Other 6 $ Environmental Cost Recovery Adj 800 kWh X Energy Efficiency Programs 800 kWh X Franchise Cost $ X State Tax Total Current Charges $ Explanation of Billing Line Items 1 Charges include: a) IDUF or b) (i) ISUF and (ii) SBUF as applicable.

5 2 Transmission services Charge, Electricity Supply Charge and Purchased Electricity Adjustment (PEA) are electricity supply related line items. The PEA could be a charge or a credit and varies monthly. Each charge is a per kWh value multiplied by the kWh supplied in the billing period. 3 The charge to recover costs of a standard Service connection, customer Service operations, billing and other delivery system costs. Also includes $ in State of Illinois mandated adjustments for renewable energy resources, coal technology development and low income energy assistance as well as Residential real time pricing and consolidated billing programs. It is a per month charge. 4 The charge to recover the costs of meter reading and other standard metering services . It is a per month charge. 5 The charge to recover costs to install and maintain the electric delivery system.

6 It is a per kWh charge multiplied by the kWhs delivered in the billing period. 6 Environmental Cost Recovery Adjustment recovers certain environmental costs. Energy Efficiency Programs (EDA), Franchise Cost and Taxes are government mandated line items. EDA recovers the cost of energy efficiency and demand response measures. Franchise Cost recovers the cost that the local municipality requires to allow distribution facilities to be installed within the municipality. The illustrative Franchise Cost percentage in the Sample Bill is a system average. State tax is applicable to all customers. Municipal tax varies by municipality, and is dependent upon what, if any, municipal utility tax is imposed by the municipality.