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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 Commercial Natural Gas Deliveries in Illinois Represented by the Price  (Percent)
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|Percent of Commercial 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 
|--------------------------------------------------------------------------------------------------------------------------------- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ----
|1989                                                                                                                              | 71.8 | 73.5 | 69.8 | 69.6 | 67.5 | 59.7 | 50.2 | 47.4 | 62.4 | 64.5 | 68.9 | 74.5
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|1990                                                                                                                              | 65.6 | 65.7 | 60.2 | 55.3 | 52.9 | 40.6 | 40.7 | 41.8 | 44.5 | 54.6 | 52.2 | 63.6
|1991                                                                                                                              | 66.1 | 62.7 | 61.0 | 56.7 | 49.1 | 45.4 | 39.4 | 43.5 | 55.0 | 54.8 | 60.4 | 60.3
|1992                                                                                                                              | 63.0 | 58.2 | 59.5 | 57.5 | 53.0 | 43.4 | 44.4 | 49.2 | 47.0 | 55.5 | 60.5 | 59.9
|1993                                                                                                                              | 61.0 | 58.4 | 58.3 | 56.3 | 51.5 | 43.4 | 42.9 | 38.3 | 50.0 | 50.2 | 53.7 | 56.0
|1994                                                                                                                              | 59.1 | 59.9 | 58.0 | 49.9 | 46.5 | 37.8 | 36.1 | 36.3 | 39.7 | 47.5 | 49.9 | 52.0
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|1995                                                                                                                              | 54.8 | 53.2 | 52.9 | 49.3 | 40.2 | 42.9 | 38.6 | 38.2 | 39.6 | 46.6 | 51.8 | 53.3
|1996                                                                                                                              | 56.9 | 58.3 | 57.8 | 51.7 | 49.7 | 44.1 | 39.6 | 43.0 | 43.2 | 48.8 | 53.0 | 56.1
|1997                                                                                                                              | 62.9 | 55.3 | 55.4 | 54.1 | 48.4 | 55.8 | 46.7 | 40.3 | 47.7 | 50.4 | 52.5 | 52.1
|1998                                                                                                                              | 54.5 | 51.3 | 57.8 | 45.0 | 35.7 | 43.2 | 27.8 | 36.5 | 37.3 | 40.7 | 44.8 | 45.2
|1999                                                                                                                              | 47.6 | 47.3 | 49.0 | 42.2 | 36.0 | 34.8 | 27.2 | 25.4 | 35.6 | 39.8 | 39.4 | 43.2
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|2000                                                                                                                              | 46.1 | 46.8 | 45.4 | 41.7 | 33.6 | 26.9 | 27.3 | 30.0 | 34.1 | 34.1 | 45.2 | 43.5
|2001                                                                                                                              | 47.6 | 44.7 | 43.6 | 41.4 | 34.5 | 29.8 | 30.9 | 28.3 | 32.7 | 37.0 | 36.8 | 42.5
|2002                                                                                                                              | 43.6 | 44.1 | 45.7 | 38.8 | 35.4 | 28.1 | 29.5 | 28.8 | 30.0 | 39.1 | 41.6 | 46.3
|2003                                                                                                                              | 46.2 | 47.2 | 48.2 | 41.9 | 32.6 | 35.1 | 33.8 | 34.4 | 37.4 | 38.4 | 39.9 | 45.2
|2004                                                                                                                              | 45.4 | 47.4 | 42.5 | 39.9 | 30.3 | 33.9 | 28.3 | 30.2 | 30.6 | 37.7 | 40.1 | 44.6
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|2005                                                                                                                              | 46.9 | 44.2 | 44.5 | 39.8 | 33.0 | 28.9 | 32.9 | 30.4 | 31.3 | 39.5 | 39.5 | 44.6
|2006                                                                                                                              | 46.0 | 45.0 | 43.8 | 41.8 | 36.6 | 27.6 | 29.4 | 27.2 | 29.0 | 33.6 | 37.9 | 42.2
|2007                                                                                                                              | 44.9 | 45.5 | 47.4 | 43.9 | 46.7 | 38.5 | 31.8 | 30.2 | 32.7 | 33.1 | 36.6 | 43.2
|2008                                                                                                                              | 46.7 | 48.1 | 48.8 | 48.0 | 38.6 | 40.1 | 28.9 | 31.2 | 31.7 | 35.5 | 37.7 | 43.7
|2009                                                                                                                              | 48.3 | 46.5 | 47.3 | 44.0 | 40.7 | 37.9 | 29.4 | 26.5 | 28.0 | 33.3 | 35.7 | 38.9
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|2010                                                                                                                              | 47.4 | 49.2 | 45.3 | 41.9 | 33.5 | 33.1 | 28.9 | 30.7 | 30.0 | 35.4 | 43.1 | 41.2
|2011                                                                                                                              | 43.8 | 45.8 | 44.2 | 38.0 | 34.7 | 27.7 | 24.9 | 23.9 | 27.5 | 29.2 | 33.0 | 39.2
|2012                                                                                                                              | 43.6 | 42.2 | 35.1 | 34.7 | 26.1 | 27.5 | 24.4 | 26.3 | 29.2 | 33.2 | 38.6 | 40.2
|2013                                                                                                                              | 42.6 | 42.5 | 41.1 | 37.0 | 30.4 | 26.1 | 25.4 | 26.3 | 28.2 | 37.6 | 38.4 | 42.1
|2014                                                                                                                              | 44.1 | 45.5 | 41.1 | 33.9 | 28.5 | 29.6 | 24.4 | 23.0 | 27.6 | 32.9 | 40.5 | 38.6
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|2015                                                                                                                              | 42.5 | 42.8 | 38.7 | 32.5 | 25.4 | 24.1 | 24.4 | 21.8 | 20.9 | 30.1 | 35.4 | 37.1
|2016                                                                                                                              | 41.2 | 39.9 | 35.4 | 32.7 | 24.9 | 23.9 | 22.0 | 19.3 | 22.2 | 29.0 | 33.8 | 40.1
|2017                                                                                                                              | 39.5 | 37.0 | 38.3 | 30.1 | 24.9 | 22.9 | 23.7 | 20.6 | 21.3 | 34.3 | 36.2 | 37.8
|2018                                                                                                                              | 41.1 | 38.7 | 37.8 | 34.7 | 21.7 | 21.8 | 19.2 | 20.7 | 21.3 | 34.1 | 39.7 | 38.9
|2019                                                                                                                              | 41.6 | 40.2 | 37.9 | 30.7 | 28.6 | 23.0 | 21.9 | 21.3 | 21.0 | 34.8 | 37.7 | 37.2
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|2020                                                                                                                              | 40.7 | 39.3 | 34.7 | 32.7 | 28.5 | 20.6 | 21.1 | 20.0 | 21.1 | 32.4 | 33.2 | 41.2
|2021                                                                                                                              | 40.5 | 42.5 | 31.1 | 31.9 | 24.4 | 20.0 | 22.3 | 20.2 | 22.3 | 32.5 | 37.8 | 36.7
|2022                                                                                                                              | 43.0 | 38.8 | 36.8 | 31.9 | 25.3 | 19.5 | 18.9 | 21.3 | 22.5 | 29.4 | 34.4 | 39.1
|2023                                                                                                                              | 38.9 | 37.9 | 36.8 | 30.2 | 24.1 | 18.9 | 19.2 | 20.9 | 20.5 | 30.1 | 35.7 | 36.5
|2024                                                                                                                              | 42.2 | 33.5 | 35.7 | 29.4 | 20.7 |      |      |      |      |      |      |     
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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