Illinois Business Energy Bill Audit Guide

An Illinois business bill check should establish the account's supply arrangement and utility class before comparing prices. ComEd and Ameren Illinois business accounts can have different supply structures; a residential price-to-compare headline should not automatically become a commercial baseline.

Identify the electricity supply arrangement

The ICC's switching reports distinguish utility fixed-price supply, hourly supply and retail supplier service. Find the actual category and supplier for the business. Retain the signed price schedule if a competitive agreement is already in place, and check the dates before treating an invoice rate as the next year's rate.

ComEd's own business bill estimator asks for delivery service class as well as monthly kWh and kW information. That is a useful reminder that commercial costs depend on more than the usage-based supply price. The simplified bill checker on this site does not recreate those utility-specific determinants.

Keep delivery and procurement questions separate

For an offer comparison, document which components are in the current and proposed prices. Ask specifically about capacity, transmission, losses and any separately charged compensation or service fee. A fee already embedded in the rate should not be entered a second time.

For a demand or tariff question, collect the business's actual rate class and billing-demand history. An operating change such as new refrigeration or production equipment can affect the account picture. A supply quote does not establish whether that utility-side treatment is correct.

Check aggregation and account authority

If the statement shows a municipal aggregation or another group arrangement, identify the actual rate and the business's enrollment status. Do not assume every commercial account participates on the same basis as a resident. The current bill and program documents should show which arrangement is being compared.

For a commercial property, determine whether the owner, manager or tenant holds each meter and who bears the bill. Keep common-area accounts distinct from tenant accounts. A lower tenant supply cost is not automatically an increase in owner-retained income.

Natural gas requires its own scope

For Nicor Gas, Peoples Gas, North Shore Gas, Ameren or another serving utility, identify the actual gas supply and transportation arrangement. A business can have different electricity and gas providers. Confirm eligibility and tariff obligations separately rather than transferring conclusions from the electric account.

Record therm, CCF or other usage units exactly, and match the proposed price denominator. Retain seasonal usage where heating matters. A fixed gas commodity price does not necessarily fix transportation, balancing or every bill component.

A hypothetical Illinois workshop example

Consider 240,000 annual kWh. Current supply at 9.0¢ plus a separate $20 monthly fee produces $21,840 annually. Offered supply at 7.5¢ plus $30 monthly produces $18,360, a $3,480 modeled difference. If switching costs $600, the first-year difference is $2,880. These are explanatory inputs, not a quoted ComEd/Ameren price or a documented customer result.

The practical review file includes the applicable agreement, utility class, twelve monthly quantities and each proposed inclusion. It should identify unresolved demand, delivery or contract questions instead of hiding them inside a claimed percentage reduction on the whole bill.

Use the result as a starting point

Once the current and offered components match, use the business bill checker to show the arithmetic. It holds entered prices constant, does not fetch live offers, and does not independently calculate utility demand, delivery or tariff charges. Use the optional twelve-month usage series when one month is unrepresentative.

For an account question, send your business, state, utility and the issue through the first-party review form. Keep bills and account identifiers out of the initial message; arrange document sharing after connecting. A listing in this guide is not a supplier-availability guarantee.