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|View History:  Monthly  Annual Download Data (XLS File)                                    
|View History:  Monthly  Annual                                                              
|View History:  Monthly  Annual                                                              
|View History:                                                                               
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|Percent of Industrial Natural Gas Deliveries in Illinois Represented by the Price  (Percent)
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|Percent of Industrial Natural Gas Deliveries in Illinois Represented by the Price  (Percent)
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|Year                                                                                                                              | Jan  | Feb  | Mar  | Apr  | May  | Jun | Jul | Aug | Sep | Oct  | Nov  | Dec 
|--------------------------------------------------------------------------------------------------------------------------------- | ---- | ---- | ---- | ---- | ---- | --- | --- | --- | --- | ---- | ---- | ----
|2001                                                                                                                              | 14.3 | 14.6 | 11.7 | 8.9  | 7.1  | 6.7 | 5.8 | 6.1 | 7.5 | 8.7  | 10.3 | 12.1
|2002                                                                                                                              | 11.2 | 11.2 | 11.1 | 10.3 | 7.6  | 7.2 | 3.9 | 5.4 | 6.6 | 9.4  | 10.7 | 12.6
|2003                                                                                                                              | 13.4 | 13.4 | 12.9 | 9.2  | 7.9  | 6.9 | 5.7 | 7.6 | 5.3 | 9.1  | 10.5 | 10.6
|2004                                                                                                                              | 13.5 | 12.0 | 9.7  | 8.1  | 5.8  | 6.1 | 6.4 | 5.7 | 5.0 | 8.3  | 10.4 | 11.5
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|2005                                                                                                                              | 12.9 | 11.8 | 10.7 | 8.2  | 6.0  | 4.7 | 6.3 | 6.0 | 6.8 | 10.6 | 11.6 | 12.5
|2006                                                                                                                              | 12.3 | 11.9 | 11.1 | 8.8  | 7.4  | 4.9 | 5.3 | 6.4 | 6.6 | 8.5  | 7.7  | 9.6 
|2007                                                                                                                              | 11.5 | 12.7 | 12.8 | 10.6 | 10.3 | 7.8 | 6.0 | 5.4 | 6.4 | 7.5  | 7.7  | 10.4
|2008                                                                                                                              | 11.7 | 12.9 | 12.9 | 11.8 | 8.2  | 7.5 | 5.6 | 6.2 | 6.0 | 6.1  | 8.0  | 10.2
|2009                                                                                                                              | 12.6 | 11.0 | 9.4  | 8.1  | 6.1  | 4.5 | 3.7 | 3.6 | 4.3 | 5.4  | 6.9  | 9.9 
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|2010                                                                                                                              | 10.9 | 11.1 | 10.8 | 6.6  | 5.2  | 3.8 | 3.3 | 3.8 | 3.7 | 4.6  | 5.0  | 7.6 
|2011                                                                                                                              | 11.1 | 9.9  | 8.2  | 7.1  | 4.7  | 3.4 | 2.6 | 2.8 | 3.0 | 4.3  | 6.0  | 7.3 
|2012                                                                                                                              | 9.4  | 9.4  | 5.8  | 5.4  | 3.3  | 2.9 | 3.1 | 2.3 | 3.7 | 6.3  | 7.7  | 8.4 
|2013                                                                                                                              | 9.9  | 10.6 | 8.5  | 7.2  | 4.3  | 3.2 | 2.8 | 2.3 | 3.6 | 4.6  | 8.3  | 10.7
|2014                                                                                                                              | 10.4 | 12.1 | 10.5 | 6.2  | 3.2  | 2.2 | 2.0 | 1.8 | 2.6 | 4.4  | 6.7  | 7.9 
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|2015                                                                                                                              | 10.4 | 11.0 | 8.5  | 5.2  | 3.6  | 3.2 | 2.4 | 2.9 | 2.9 | 4.1  | 5.8  | 7.6 
|2016                                                                                                                              | 10.3 | 9.1  | 7.4  | 5.3  | 5.1  | 3.1 | 2.1 | 2.2 | 3.0 | 4.1  | 5.6  | 9.7 
|2017                                                                                                                              | 9.5  | 8.1  | 8.3  | 4.9  | 3.7  | 2.9 | 2.4 | 2.9 | 2.7 | 4.7  | 6.8  | 9.4 
|2018                                                                                                                              | 9.6  | 9.4  | 8.1  | 7.8  | 5.5  | 3.1 | 2.0 | 2.1 | 2.8 | 4.3  | 7.0  | 9.0 
|2019                                                                                                                              | 10.0 | 11.3 | 8.2  | 6.5  | 6.8  | 2.3 | 1.9 | 2.6 | 3.4 | 5.4  | 8.6  | 9.1 
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|2020                                                                                                                              | 9.4  | 9.7  | 9.2  | 6.3  | 5.9  | 6.8 | 7.1 | 6.4 | 6.0 | 5.3  | 5.6  | 8.3 
|2021                                                                                                                              | 10.0 | 14.6 | 9.5  | 6.5  | 5.1  | 2.7 | 3.0 | 1.9 | 2.5 | 4.3  | 4.3  | 10.1
|2022                                                                                                                              | 13.3 | 12.4 | 12.2 | 12.4 | 8.5  | 1.9 | 2.6 | 2.5 | 2.7 | 4.5  | 5.7  | 8.6 
|2023                                                                                                                              | 8.8  | 8.6  | 7.8  | 5.4  | 4.3  | 2.2 | 2.5 | 2.4 | 1.9 | 4.7  | 5.3  | 7.0 
|2024                                                                                                                              | 9.4  | NA   | 6.0  | 5.4  | 2.9  |     |     |     |     |      |      |     
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|- = No Data Reported;  -- = Not Applicable;  NA = Not Available;  W = Withheld to avoid disclosure of individual company data.
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|Release Date: 7/31/2024                                                                                                          
|Next Release Date: 8/30/2024