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Understanding My Bill - Residential - Illinois Gas - Liberty

Understanding My Bill

To help you better understand the terms used on your bill, an example bill is provided for reference to walk through each item and identify terms you may wish to look up.

Sample Residential Bill

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Bill Explainer

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Customer Handbook

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Frequently Asked Questions


  • Liberty service includes a fixed monthly customer charge, no matter how much natural gas is used. The charge allows Liberty to recover a portion of its operational costs and rate of return on its investment.

  • Your usage charge is based on your natural gas consumption. It is billed as the cubic feet of natural gas used.

  • A degree day is a measure of coldness based on the extent to which the daily mean temperature falls below 65°F. For example, on a day when the average temperature is 35°F, there would be 30 degree days experienced.

  • This is the cost the company pays to purchase natural gas on the open market, plus the transportation and storage services fees. It also reflects any under- or over- collection of actual costs in the previous period. The PGA accounts for about two-thirds to three-fourths of a winter bill.

  • Some of the hands on the dial of your meter move in a clockwise fashion, while others move counterclockwise. All move from the lowest number to the highest. To read your meter, simply write down the number where the dial is pointing. When the hand is between numbers, use the smaller number

  • Liberty tries to read each customer’s meter each month. However, sometimes it is not possible and estimations must be made. Any variation between a customer’s actual usage and the estimated usage will be corrected the next time the meter is read.

Your Natural Gas Bill Explained:

Understanding My Bill