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|View History: Monthly Download Data (XLS File)                                                             
|View History: Monthly                                                                                       
|View History: Monthly                                                                                       
|View History:                                                                                               
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|Illinois Natural Gas in Underground Storage - Change in Working Gas from Same Month Previous Year  (Percent)
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|Illinois Natural Gas in Underground Storage - Change in Working Gas from Same Month Previous Year  (Percent)
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|Year                                                                                                                              | Jan   | Feb   | Mar   | Apr   | May   | Jun   | Jul   | Aug   | Sep   | Oct   | Nov   | Dec  
|--------------------------------------------------------------------------------------------------------------------------------- | ----- | ----- | ----- | ----- | ----- | ----- | ----- | ----- | ----- | ----- | ----- | -----
|1991                                                                                                                              | -4.2  | -4.0  | 0.3   | 4.2   | 3.5   | 1.7   | 1.1   | 0.4   | 0.0   | 2.4   | -3.8  | -3.3 
|1992                                                                                                                              | -4.2  | -4.8  | -6.4  | -12.6 | -9.2  | -7.2  | -5.6  | -3.3  | -2.3  | -2.3  | -2.2  | -6.6 
|1993                                                                                                                              | -24.0 | -31.6 | -36.3 | -30.7 | -24.7 | -20.2 | -17.4 | -16.7 | -14.3 | -13.7 | -11.6 | -12.9
|1994                                                                                                                              | -3.7  | -1.1  | 10.0  | 6.3   | -2.8  | -4.3  | -2.6  | -1.9  | -1.2  | -0.2  | 0.0   | 4.9  
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|1995                                                                                                                              | 13.3  | 6.3   | -0.8  | -4.1  | -24.0 | -19.8 | -17.7 | -16.0 | -15.8 | -12.9 | -15.3 | -22.1
|1996                                                                                                                              | -32.4 | -34.1 | -42.5 | -37.1 | -6.6  | -2.1  | 2.0   | 3.5   | 5.3   | 3.1   | 3.2   | 8.3  
|1997                                                                                                                              | 15.3  | 24.7  | 33.5  | 27.3  | 14.8  | 7.4   | 3.9   | 3.6   | 2.9   | 2.4   | 8.6   | 5.5  
|1998                                                                                                                              | 12.9  | 22.3  | 23.5  | 24.2  | 18.8  | 14.7  | 8.2   | 4.3   | 2.2   | 2.3   | -0.8  | 0.8  
|1999                                                                                                                              | -13.4 | -22.1 | -27.4 | -39.7 | -30.1 | -26.0 | -22.5 | -18.3 | -13.6 | -11.1 | -10.2 | -12.3
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|2000                                                                                                                              | -2.7  | 2.8   | 24.7  | 25.9  | 2.4   | 8.4   | 8.5   | 3.9   | -0.1  | 1.2   | -7.3  | -9.4 
|2001                                                                                                                              | -2.0  | -11.5 | -15.0 | 16.6  | 35.5  | 19.4  | 9.9   | 5.6   | 5.7   | 1.2   | 24.4  | 27.6 
|2002                                                                                                                              | 25.2  | 32.8  | 21.5  | -5.6  | -8.8  | 1.0   | 5.9   | 12.1  | 12.5  | 12.7  | -4.5  | -7.5 
|2003                                                                                                                              | -18.1 | -27.9 | -22.7 | 3.3   | 5.4   | 0.5   | 2.7   | -0.7  | -2.8  | -1.6  | 0.2   | 4.5  
|2004                                                                                                                              | 9.2   | 21.7  | 6.1   | -10.7 | -9.2  | -5.8  | -3.3  | -0.3  | -1.6  | -2.1  | -2.1  | -6.5 
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|2005                                                                                                                              | -8.6  | -15.9 | -22.0 | -25.3 | -17.0 | -12.6 | -9.2  | -6.2  | -2.7  | -1.1  | 0.2   | -0.1 
|2006                                                                                                                              | 15.9  | 12.7  | 15.8  | 17.4  | 8.1   | 4.1   | 1.6   | 0.8   | 1.1   | 0.9   | 0.0   | 2.9  
|2007                                                                                                                              | -11.6 | -14.1 | 4.0   | -1.6  | 3.5   | 1.8   | 1.5   | -0.2  | 0.1   | 0.7   | -1.7  | -5.1 
|2008                                                                                                                              | -7.5  | -12.7 | -24.4 | -18.8 | -17.8 | -10.1 | -7.4  | -2.5  | -2.2  | -1.6  | 0.3   | -0.6 
|2009                                                                                                                              | 1.6   | 9.3   | 4.1   | -2.5  | 4.9   | 1.2   | 1.6   | 0.6   | 1.1   | 1.2   | 2.9   | 3.5  
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|2010                                                                                                                              | 2.9   | 0.6   | 8.0   | 30.3  | 17.8  | 10.7  | 2.6   | 0.2   | -0.9  | 0.2   | 0.5   | 1.2  
|2011                                                                                                                              | -1.6  | -2.1  | -17.4 | -17.7 | -14.9 | -9.3  | -5.0  | -1.7  | -1.2  | -2.4  | 0.4   | 0.6  
|2012                                                                                                                              | 4.4   | 3.6   | 36.2  | 17.5  | 13.8  | 5.5   | 4.2   | 2.7   | 0.8   | 1.0   | -1.6  | -0.4 
|2013                                                                                                                              | -1.3  | -9.0  | -28.5 | -19.0 | -15.8 | -7.4  | -5.2  | -5.5  | -3.1  | -3.2  | -2.9  | -6.8 
|2014                                                                                                                              | -12.8 | -8.2  | -6.9  | -11.6 | -4.6  | -2.6  | 0.3   | 1.8   | 1.3   | 3.0   | 1.8   | 5.5  
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|2015                                                                                                                              | 16.4  | 16.0  | 30.7  | 23.8  | 14.5  | 4.3   | 1.3   | -1.6  | -1.9  | -2.7  | 2.2   | 5.5  
|2016                                                                                                                              | 3.5   | 16.4  | 15.1  | 8.8   | 2.0   | 3.4   | -0.3  | -0.7  | 1.3   | 1.5   | 0.8   | -2.9 
|2017                                                                                                                              | 3.0   | 13.0  | 2.6   | 3.5   | -7.6  | -5.0  | -6.3  | -4.5  | -3.7  | -2.2  | -1.8  | -4.3 
|2018                                                                                                                              | -9.7  | -13.9 | -15.5 | -21.5 | -12.9 | -11.7 | -6.9  | -5.4  | -3.7  | -1.9  | -4.1  | 1.6  
|2019                                                                                                                              | -3.0  | -6.8  | 7.7   | 29.5  | 32.8  | 25.2  | 14.0  | 10.0  | 5.9   | 3.2   | 4.3   | 7.1  
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|2020                                                                                                                              | 26.5  | 28.5  | 16.0  | -0.7  | -12.0 | -11.7 | -4.6  | 0.4   | 1.2   | 0.6   | 3.1   | 1.6  
|2021                                                                                                                              | -2.2  | 3.0   | 9.3   | 6.6   | 1.2   | -1.0  | -3.8  | -6.0  | -2.7  | 0.1   | -1.1  | -1.4 
|2022                                                                                                                              | -10.9 | -13.4 | -16.9 | -11.7 | -5.3  | -3.5  | 1.1   | 0.7   | -2.4  | -1.7  | -3.9  | -5.1 
|2023                                                                                                                              | 10.6  | 10.3  | 5.5   | 3.8   | -1.5  | -1.0  | -2.6  | -2.5  | -1.6  | -1.1  | 3.7   | 6.7  
|2024                                                                                                                              | -2.7  | -0.6  | 9.2   | 11.5  | 12.1  |       |       |       |       |       |       |      
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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