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Energy Profile

The Energy Profile section provides information about your current and past natural gas usage.

Current Reading 
This represents the current reading of your gas meter, which is determined by one of three methods:

  • Actual Meter Reading – your reading was taken by a company meter reader.
  • Customer Reading – you reported your meter reading to us.
  • Estimated Meter Reading – Nicor Gas estimated your meter reading based on your previous usage and the weather. Every other month, we estimate most meter readings. Then, on your next bill, any difference from your prior month's estimate is automatically corrected when we take an actual meter reading.

Previous Reading
The reading of your gas meter in the last billing period.

Usage CCF
The difference in gas usage (measured in hundreds of cubic feet) between the previous reading and the current reading.

BTU Factor
A factor which expresses the amount of heat content a CCF of gas contains. The BTU factor is applied to convert a volume of gas measured in CCF into therms and may change slightly from month to month.

Average Daily Therms
Your new bill shows your average therm usage for the current billing period and for the same period last year. For billing, your natural gas use is converted from hundreds of cubic feet (CCF) into therms, the basic unit for measuring and billing the amount of natural gas you use. One therm is equal to 100,000 British thermal units (BTU). To determine the amount of therms, we multiply your CCF use by the BTU factor. This factor gives the actual heating value of the gas we supply. The BTU factor may vary from month to month, so please refer to your bill for the actual factor being used.

Monthly Therm Use
This graph shows your therm usage for the last 13 months, with the average temperature and natural gas cost (if you purchase your natural gas from Nicor Gas) for each month.