Serving approximately 2.2 million customers across Northern Illinois, Nicor Gas is a regulated utility providing both delivery and gas supply. As a Southern Company Gas subsidiary, they offer reliable service with rates regulated by the Illinois Commerce Commission. This guide explains every component of your bill.
Enter your bill details to see if your effective rate falls within the typical range for Nicor Gas customers.
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Most utility bills are calculated correctly.
This quick check helps you understand if your bill stands out from typical ranges. It cannot determine accuracy without a full bill review.
The "Total Amount Due" on your bill
Usually labeled "Total kWh" or "Usage"
Disclaimer: This tool provides a rough estimate based on typical residential rates. It does not account for fixed charges, demand charges, time-of-use pricing, taxes, fees, or other bill components. Results are for informational purposes only and should not be considered financial or legal advice. We cannot determine billing accuracy without reviewing your full bill.
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Residential rates from 2020 to 2026
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Nicor Gas is a subsidiary of Southern Company Gas and serves approximately 2.2 million customers across Northern Illinois (excluding Chicago proper, which is served by Peoples Gas). As a regulated utility, Nicor provides both gas delivery and supply services.
Nicor's rates are regulated by the Illinois Commerce Commission (ICC). The gas supply charge fluctuates monthly based on wholesale natural gas prices, while delivery charges are relatively stable. Customers can choose alternative gas suppliers through the Customer Select program.
Understanding your Nicor Gas bill requires knowing how delivery charges, gas supply costs, and various surcharges work together. Use the guides above to learn about specific charges, or use our sanity check tool to verify your effective rate per therm.
Common questions about this utility — answered clearly with current data from published tariff schedules and regulatory filings.