Breaking down the utility charges on your residential bill


For ease of comparison, we list the Price to Compare before we break down the charges on your utility bill. Items A, B and C below reflect the order in which they appear on your ComEd bill. When you select service from a retail electric supplier, the ComEd Electric Supply Charges (including the Purchased Electricity Adjustment) and Transmission Services Charges (items A and B below) will be replaced with the charges from your new retail electric supplier. Currently, almost all suppliers will place their charges on your ComEd bill and some suppliers will send you a bill directly (containing ComEd's delivery service charges as well as the supplier's supply and transmission charges).

Price to Compare = Electric Supply Charge + Transmission Services Charge

Historical Prices to Compare

Combining the electric supply charge and the transmission services charge, the ComEd Price to Compare effective June 2014 through September 2014 is 7.596 cents per kWh.

At this time, 78% of the expected electricity needed for the Non-Summer period has been purchased. Consequently, the final Price-to-Compare for the Non-Summer period will not be known until September 2014 when the remaining Non-Summer period electricity will be purchased.

Prior to June 1, 2013, ComEd's rate for residential space heating was different from the rate for residential non-space heating accounts. As of June 1, 2013, the residential space heating and non-space heating rates are the same.

Price to Compare (in cents per kWh)

(June 2014 - September 2014)
(October 2014 – May 2015)
7.596 7.42

These Prices to Compare do not include the Purchased Electricity Adjustment, which is a component of ComEd's Electric Supply Charges. Please see the Section on Electric Supply below for a further description of the Purchased Electricity Adjustment.

A. Electric Supply

The electric supply charge is the price you pay per kilowatt-hour ("kWh") for the electricity you use in your home. The price of electric supply is determined by your choice of supplier, whether it be a Retail Electric Supplier or ComEd.

(June 2014 -September 2014)
(October 2014 – May 2015)
6.591 cents per kWh 6.415 cents per kWh

Over the course of a year, your average ComEd electric supply charge per kWh is likely somewhere between the summer rate and the non-summer rate. Whether your average electricity supply charge for a 12-month period is closer to the summer rate or closer to the non-summer rate depends on how much electricity you use and during which months you use it. Please take a look at your electric bill or log in to your ComEd account here to see how much electricity you typically use each month over the course of a year. You will be able to see your previous electricity usage by entering your ComEd account number on this page and selecting "View Summary Data Online".

Purchased Electricity Adjustment

A price adjustment (credit or charge) that is the difference between the revenues from the monthly ComEd Price-to-Compare and the actual cost of electricity supplied to ComEd customers. This charge or credit, which ensures overall ComEd customers pay no more or less than ComEd’s actual cost of purchased electricity, is capped at a maximum of 0.5 cents/kWh each month, with amounts outside of the cap deferred to the following month. The Purchased Electricity Adjustment is calculated monthly, which means that the ComEd Price-to-Compare is adjusted monthly.

Attention Residential Real Time Pricing (RRTP) Customers

To make a meaningful comparison between variable RRTP rates and RES offers, customers should compare their past electric supply cost savings from the total Electric Supply section of the bill, provided by their RRTP provider, with an electric supply cost savings estimate provided by RESs. Competitive electric supplier savings estimates are often calculated as a percentage savings compared to the utility's fixed-price electric supply rate stated in the Price to Compare table. Alternatively, customers can compute their average real-time hourly price in cents per kWh (each month the average real-time price is equal to the total of the Electric Supply section of the bill divided by the monthly kWh) to compare with RES offers posted in cents per kWh. Customers should bear in mind, however, that because RRTP rates vary over time, past savings do not predict future savings, but only serve as a guide to compare past performance.

B. Transmission Services Charge

Also included in the Electricity Supply Section on your ComEd bill is the Transmission Services Charge. The transmission services charge is designed to allow the utility to recover costs associated with transmission service. The transmission services charge usually changes annually and will change again in June 2015. ComEd's Transmission Services Charge effective June 2014 through May 2015 is 1.005 cents per kWh.

C. Delivery Service Charges

You will pay the charges to deliver the electric supply from the transmission system to your home or business regardless of whether you purchase your electric supply from ComEd or a Retail Electric Supplier. These charges are listed in the Delivery Services section of your ComEd bill.