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| Illinois Price of Natural Gas Delivered to Residential Consumers (Dollars per Thousand Cubic Feet) | ||||||||
| Decade | Year-0 | Year-1 | Year-2 | Year-3 | Year-4 | Year-5 | Year-6 | Year-7 | Year-8 | Year-9 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1960's | 1.02 | 1.02 | 1.00 | |||||||
| 1970's | 1.05 | 1.07 | 1.13 | 1.21 | 1.35 | 1.61 | 1.90 | 2.21 | 2.50 | 3.01 |
| 1980's | 3.61 | 4.05 | 4.73 | 5.46 | 5.37 | 5.55 | 5.07 | 4.81 | 4.60 | 4.92 |
| 1990's | 5.06 | 4.95 | 5.09 | 5.52 | 5.50 | 4.66 | 5.28 | 5.95 | 5.47 | 5.50 |
| 2000's | 7.33 | 9.04 | 6.41 | 8.65 | 9.41 | 11.62 | 11.18 | 10.76 | 12.07 | 8.97 |
| 2010's | 9.39 | 8.78 | 8.26 | 8.20 | 9.59 | 7.97 | 7.88 | 8.83 | 8.15 | 8.04 |
| 2020's | 7.94 | 10.51 | 13.80 | 11.57 | NA |
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 9/30/2025 |
| Next Release Date: 10/31/2025 |