Making Sense of Your Electric Bill
(For a pdf version, click here)
Your electric bill is generally divided into three categories: delivery charges, supply charges, and taxes.

Traditionally, delivery charges, which cover the cost of getting electricity to homes, have been set by the Illinois Commerce Commission (ICC) after 11-month rate cases. However, Ameren and ComEd now set those rates through a legislatively approved formula that is subject to ICC review.

The cost of the actual power (the supply charge) that ComEd and Ameren send to their customers is left up to the market. The lone exception among Illinois' major electric utilities is MidAmerican. That company's rates are fully regulated.

Electricity usage is billed by the kilowatt-hour (kWh)—roughly enough power to clean a load of dishes in the dishwasher or run a window air conditioning unit for an hour. A customer's previous and current meter readings are listed on the bill, along with the dates they were taken. The difference between the two readings is the electricity usage for the current billing period (typically a month).

A utility company should read a customer's meter at least once every other month. If it doesn't read your meter, your monthly bill will be estimated, and "E," "EST," or "ESTIMATED" will appear on it. That means your usage for that month was based on last year's usage for the same month, adjusted for weather.

If the company doesn't read your meter for two consecutive months, call the utility and find out why. Request an actual reading, or call CUB, at 1-800-669-5556, to learn how to read your own meter.
Glossary of Charges
(You may see some or all of these charges on your bill.)
Delivery Charges
Customer charge (basic service charge)
This flat fee covers the administrative costs of doing business, such as billing, postage, and building rent costs.

Distribution delivery charge (distribution facilities charge)
This per-kWh charge covers the costs of delivering power to your home and maintaining the equipment and wires that carry the electricity. This charge also covers fixed costs not recovered through the customer charge.

Meter charge (standard metering charge)
This charge covers the costs of meter reading and other services such as installing, maintaining and testing meter equipment. Ameren's monthly charge is $5, ComEd's is $4.36 and MidAmerican's is $1.72.

Illinois Electricity Distribution Tax charge
ComEd uses this charge to recover the Illinois Electricity Distribution Tax.
Supply Charges
Energy charge (a.k.a. electricity supply charge, purchased electricity)
This per-kWh rate is for the actual power you use. The rate is multiplied by how many kWhs you use. ComEd and Ameren are supposed to pass these energy costs on to customers with no markup. However, this charge may be slightly higher than the actual market price because it is adjusted for other costs, such as "line loss." That's when power travelling over the lines is lost as it gives off heat. (Note: MidAmerican Energy's charge is set by the ICC.)

Market value adjustment (purchased electricity adjustment)
Your utility is supposed to pass the price of electricity on to customers with no markup. This monthly adjustment, a credit or a debit, attempts to "true-up" any discrepancy (over or under) between what Ameren or ComEd paid for electricity and what you paid for the energy charge.

Supply cost adjustment
This charge covers other administrative costs connected to procuring power. Ameren’s adjustment is 0.062 cents per kWh (zone 1), -0.042 cents per kWh (zone 2), and 0.038 cents per kWh (zone 3). MidAmerican’s charge is 1.290 cents per kWh. ComEd does not have a separate line item for this charge, but rolls it into the energy charge.

Transmission service(s) charge
This is similar to the distribution charge, which covers the delivery of power from the utility to your home. However, this charge covers delivery from the power generator to your utility. If your utility wants to increase this charge, it has to get approval from the Federal Energy Regulatory Commission (FERC). ComEd’s charge is 1.262 cents per kWh (starting June 2016 through September 2016). Ameren’s charge is 0.772 cents per kWh. MidAmerican's charge is 0.745 cents per kWh.
Other Charges
State tax (Illinois state electricity excise tax)
This state tax is a third-of-a-cent per kWh.

Municipal tax
State law caps the amount of utility taxes that cities can impose. The utility collects the money through a rate that's less than a penny per kWh and forwards it to the municipality. It's also called the "local government compliance charge."

Environmental cost recovery
This charge covers clean-up costs at former gas-manufacturing sites. It's also called the "environmental factor EPA charge" and the "electric environmental adjustment clause."

Franchise cost
Some cities require a utility to pay a fee or provide other benefits in exchange for the right to deliver electricity to them. Utilities recover those costs from the customers in those communities.

Smart meter program
This is a monthly charge that supported a ComEd pilot program in select communities to test whether the consumer benefits of "smart grid" improvements to the electricity system outweigh the costs. The charge was designed to cost no more than $5 per customer for the entire year. A state appellate court ruling in October 2010 struck down the charge. The decision impacts cases going forward. ComEd was allowed to cover lingering costs for the smart-grid pilot program before discontinuing the charge.

Energy Efficiency Programs
Under the Public Utilities Act, ComEd and Ameren can recover the costs of energy-efficiency and "demand-response" programs designed to help consumers save money. This per kWh charge covers programs such as air-conditioner cycling, appliance recycling, and Real-Time Pricing. Learn more about these incentives at
What Your Electric Utility Charges (through May 2016)
Ameren Zone 1 (formerly CIPS) (1-800-755-5000)
Note: The space heat rates are NOT applicable to new customers.

Monthly Customer Charge*:
Energy Charge Non-summer:
6.78¢/kWh, 0-800 kWh / 4.683¢/kWh, over kWh (Jan 2016-May 2016)
Energy Charge Summer:
5.974¢/kWh (June 2015-Sep 2015)
Distribution Charge:
4.727 ¢/kWh

2.770¢/kWh for the first 800 kWh, 1.485¢/kWh after

Ameren Zone 2 (formerly CILCO) (1-800-755-5000)
Monthly Customer Charge*:
Energy Charge Non-summer:
6.717¢/kWh, 0-800 kWh / 4.62¢/kWh, over kWh (Jan 2016-May 2016)
Energy Charge Summer:
5.911¢/kWh (June 2015-Sep 2015)
Distribution Charge:

2.770 ¢/kWh for the first 800 kWh, 1.485¢/kWh after

Ameren Zone 3 (formerly IP) (1-800-755-5000)

Monthly Customer Charge*:
Energy Charge Non-summer:
6.772¢/kWh, 0-800 kWh / 4.675¢/kWh, over kWh (Jan 2016-May 2016)
Energy Charge Summer:
5.966¢/kWh (June 2015-May 2016)
Distribution Charge:
4.727 ¢/kWh

2.770¢/kWh for the first 800 kWh, 1.485¢/kWh after
$10.48 for single-family homes and buildings with two units ($11.92 space heat customers) $7.57 for buildings with three or more units ($8.05 space heat customers)
ComEd (1-800-334-7661)
Monthly Customer Charge*:
$10.48 for single-family homes and buildings with two units ($11.92 for space heat customers)

$7.57 for buildings with three or more units ($8.05 for space heat customers)

(Real-Time Pricing customers pay an additional $0.39—rolled into the customer charge—to cover program costs.)
Energy Charge Non-summer:
6.987¢/kWh (Jan 2016- May 2016)
Energy Charge Summer:

4.928¢/kWh (June 2016-Sep 2016)

Distribution Charge:
Space heat:
1.989¢/kWh for single-family, 2.096¢/kWh for multi-family

Non-space heat:
3.272¢/kWh for single-family,
3.304¢/kWh for multi-family

MidAmerican Energy (1-888-427-5632)
Monthly Customer Charge*:
Energy Charge Non-summer:
2.705¢/kWh for first 1,000 kWh
0.878¢/kWh for usage over 1,000 kWh

Energy Charge Summer:
5.695¢/kWh for all usage

Distribution Charge:
*The customer charge listed may include small fees for state funds to subsidize heating costs for low-income consumers and to develop renewable energy and "clean-coal technology." It also may include a fee to recover the costs of real-time pricing programs, which allow homes to pay an hourly rate for power; a fee to cover utility billing costs associated with alternative retail energy suppliers; and an uncollectibles charge.