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|View History: Annual Download Data (XLS File)                        
|View History: Annual                                                  
|View History: Annual                                                  
|View History:                                                         
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|Illinois Natural Gas Wellhead Price  (Dollars per Thousand Cubic Feet)
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|Illinois Natural Gas Wellhead Price  (Dollars per Thousand Cubic Feet)
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|Decade                                                                                                                            | Year-0 | Year-1 | Year-2 | Year-3 | Year-4 | Year-5 | Year-6 | Year-7 | Year-8 | Year-9
|--------------------------------------------------------------------------------------------------------------------------------- | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------
|1960's                                                                                                                            |        |        |        |        |        |        |        | 0.12   | 0.13   | 0.14  
|1970's                                                                                                                            | 0.16   | 0.18   | 0.28   | 0.35   | 0.40   | 0.70   | 0.99   | 1.20   | 1.29   | 1.86  
|1980's                                                                                                                            | 1.90   | 2.47   | 2.62   | 2.84   | 2.78   | 2.77   | 2.57   | 2.24   | 2.19   | 2.15  
|1990's                                                                                                                            | 2.11   | 2.17   | 2.15   | 2.30   | 2.40   |        |        |        |        |       
|2000's                                                                                                                            |        |        |        |        |        |        |        | NA     | NA     | NA    
|2010's                                                                                                                            | NA     |        |        |        |        |        |        | --     | --     | --    
|2020's                                                                                                                            | --     | --     |        |        |        |        |        |        |        |       
|- = No Data Reported;  -- = Not Applicable;  NA = Not Available;  W = Withheld to avoid disclosure of individual company data.
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|Release Date: 4/30/2024                                                                                                          
|Next Release Date: 5/31/2024