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| Illinois Working Natural Gas Underground Storage Depleted Fields Capacity (Million Cubic Feet) | |||||
| Decade | Year-0 | Year-1 | Year-2 | Year-3 | Year-4 | Year-5 | Year-6 | Year-7 | Year-8 | Year-9 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2000's | 51,418 | 51,418 | ||||||||
| 2010's | 87,368 | 87,368 | 87,368 | 11,768 | 11,768 | 11,768 | 11,768 | 53,108 | 51,768 | 51,768 |
| 2020's | 51,768 | 51,768 | 51,768 | 51,768 |
| - = 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 |