Nicor Gas Bill Explained

Last updated: January 2026

Your Nicor Gas bill contains multiple line items that can seem confusing at first glance. This guide walks through each charge so you can understand exactly what you're paying for and verify that your bill is accurate.

A typical Nicor bill includes 6-10 distinct charges, plus taxes and fees. Understanding each component helps you identify opportunities to reduce costs and catch potential errors.

Customer Charge

The Monthly Customer Charge (approximately $23) is a fixed fee that covers Nicor's costs for:

  • Meter reading and maintenance
  • Billing and customer service
  • Maintaining your service connection

You pay this charge even if you use zero therms in a month. It's the same for all residential customers regardless of usage level.

Delivery Charges

Delivery charges cover the cost of transporting gas through Nicor's pipeline network to your home. These include:

  • Distribution Charge: Per-therm fee for pipeline usage
  • Rider charges: Various surcharges for infrastructure, environmental compliance, and energy efficiency programs

Delivery charges are regulated by the ICC and are the same whether you buy gas from Nicor or an alternative supplier.

Gas Supply Charge

The Gas Supply Charge covers the cost of the natural gas commodity. This is calculated by multiplying your therm usage by the current supply rate (e.g., 200 therms × $0.42/therm = $84).

This charge fluctuates monthly based on wholesale gas prices. If you've chosen an alternative supplier through Customer Select, their rate appears here instead of Nicor's.

Taxes and Fees

Additional charges on your bill may include:

  • State Tax: Illinois tax on gas utility services
  • Municipal Tax: Local taxes that vary by municipality
  • Franchise Fee: Fees paid to your city for use of public rights-of-way

These charges typically add 5-10% to your pre-tax bill amount.

Reading Your Bill Statement

Your bill shows current and previous meter readings, therm usage, and a breakdown of all charges. Key items to check:

  • Meter readings: Verify the "current" reading matches your meter
  • Billing period: Check the dates covered
  • Gas supply rate: Compare to Nicor's published rate

If anything seems incorrect, learn how to verify your bill.

Quick Nicor Gas Bill Check

Enter your bill details below to see if your rate appears typical for Nicor Gas customers.

Quick Bill Sanity Check

No upload required. Enter two numbers from your bill to see if it falls within typical ranges for Nicor Gas.

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.

Want a Definitive Answer?

The sanity check above provides context, but it can't verify your actual bill. Upload your Nicor Gas bill for a complete verification of billing math, rate application, and usage patterns.

One-time $19.99 · Read-only analysis · No account access required

More About Nicor Gas Billing

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Frequently Asked Questions

Why is there a customer charge if I barely use gas?

The customer charge covers Nicor's fixed costs for maintaining your service connection, regardless of usage. These costs exist whether you use 1 therm or 200 therms.

What are the 'rider' charges on my bill?

Riders are surcharges approved by the ICC for specific purposes: infrastructure improvements, environmental compliance, energy efficiency programs, and cost recovery for various regulatory requirements.

Can I reduce my taxes and fees?

Taxes and fees are set by state and local governments and apply to all customers. The only way to reduce them is to reduce your overall gas usage, which lowers the base amount they're calculated on.