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| Illinois Heat Content of Natural Gas Deliveries to Consumers (BTU per Cubic Foot) | ||||||||
| Decade | Year-0 | Year-1 | Year-2 | Year-3 | Year-4 | Year-5 | Year-6 | Year-7 | Year-8 | Year-9 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2000's | 1,015 | 1,014 | 1,013 | |||||||
| 2010's | 1,008 | 1,011 | 1,011 | 1,016 | 1,023 | 1,029 | 1,031 | 1,029 | 1,029 | 1,033 |
| 2020's | 1,036 | 1,034 | 1,041 | 1,040 | 1,046 |
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 10/31/2025 |
| Next Release Date: 11/28/2025 |