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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  (Million Cubic Feet)
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|Illinois Natural Gas in Underground Storage - Change in Working Gas from Same Month Previous Year  (Million Cubic Feet)
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|Year                                                                                                                              | Jan     | Feb     | Mar     | Apr     | May     | Jun     | Jul     | Aug     | Sep     | Oct     | Nov     | Dec    
|--------------------------------------------------------------------------------------------------------------------------------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | -------
|1990                                                                                                                              | 9,275   | 18,043  | 13,193  | 1,851   | 5,255   | 9,637   | 5,108   | 8,495   | 9,773   | 7,534   | 9,475   | 11,984 
|1991                                                                                                                              | -9,933  | -7,259  | 454     | 6,145   | 6,270   | 3,648   | 2,744   | 1,010   | -13     | 7,942   | -12,681 | -9,742 
|1992                                                                                                                              | -9,345  | -8,466  | -9,599  | -19,126 | -16,878 | -15,372 | -13,507 | -9,010  | -7,228  | -7,653  | -6,931  | -18,707
|1993                                                                                                                              | -51,572 | -52,876 | -51,081 | -40,760 | -41,229 | -40,132 | -39,867 | -44,533 | -43,110 | -44,873 | -36,080 | -34,184
|1994                                                                                                                              | -6,101  | -1,289  | 8,929   | 5,795   | -3,558  | -6,807  | -4,948  | -4,181  | -3,006  | -678    | -77     | 11,376 
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|1995                                                                                                                              | 20,962  | 7,104   | -805    | -3,970  | -29,257 | -30,038 | -32,571 | -35,022 | -40,472 | -36,406 | -41,858 | -53,433
|1996                                                                                                                              | -57,642 | -40,939 | -41,504 | -34,834 | -6,148  | -2,598  | 3,084   | 6,435   | 11,435  | 9,244   | 7,513   | 15,549 
|1997                                                                                                                              | 18,479  | 19,537  | 18,859  | 16,125  | 12,752  | 8,775   | 6,069   | 6,829   | 6,578   | 6,212   | 20,677  | 11,251 
|1998                                                                                                                              | 17,934  | 22,067  | 17,623  | 18,194  | 18,602  | 18,706  | 13,154  | 8,527   | 5,210   | 5,912   | -2,080  | 1,650  
|1999                                                                                                                              | -21,059 | -26,756 | -25,355 | -37,082 | -35,407 | -37,999 | -39,188 | -37,494 | -32,413 | -29,859 | -26,477 | -26,720
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|2000                                                                                                                              | -3,683  | 2,681   | 16,664  | 14,611  | 1,962   | 9,111   | 11,490  | 6,616   | -205    | 2,858   | -16,931 | -17,840
|2001                                                                                                                              | -2,606  | -11,125 | -12,599 | 11,789  | 29,941  | 22,809  | 14,426  | 9,711   | 11,736  | 2,955   | 52,403  | 47,533 
|2002                                                                                                                              | 32,524  | 28,108  | 15,368  | -4,648  | -10,103 | 1,438   | 9,549   | 22,225  | 27,226  | 30,904  | -12,080 | -16,539
|2003                                                                                                                              | -29,331 | -31,705 | -19,673 | 2,552   | 5,573   | 704     | 4,594   | -1,497  | -6,942  | -4,443  | 384     | 9,140  
|2004                                                                                                                              | 12,237  | 17,798  | 4,079   | -8,590  | -10,096 | -8,252  | -5,800  | -581    | -3,923  | -5,602  | -5,483  | -13,875
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|2005                                                                                                                              | -12,409 | -15,891 | -15,692 | -18,226 | -16,923 | -16,874 | -15,566 | -12,636 | -6,217  | -2,977  | 554     | -206   
|2006                                                                                                                              | 21,068  | 10,640  | 8,752   | 9,365   | 6,660   | 4,759   | 2,465   | 1,616   | 2,447   | 2,417   | -2      | 5,817  
|2007                                                                                                                              | -17,777 | -13,311 | 2,587   | -997    | 3,100   | 2,170   | 2,275   | -456    | 345     | 1,729   | -4,173  | -10,327
|2008                                                                                                                              | -10,119 | -10,314 | -16,298 | -11,648 | -16,497 | -12,560 | -11,731 | -4,832  | -4,967  | -4,248  | 696     | -1,148 
|2009                                                                                                                              | 1,970   | 6,584   | 2,077   | -1,266  | 3,721   | 1,353   | 2,270   | 1,059   | 2,491   | 3,090   | 7,079   | 6,672  
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|2010                                                                                                                              | 3,657   | 432     | 4,218   | 14,903  | 14,202  | 12,107  | 3,800   | 356     | -1,949  | 439     | 1,249   | 2,321  
|2011                                                                                                                              | -2,159  | -1,603  | -9,865  | -11,348 | -13,948 | -11,634 | -7,654  | -3,290  | -2,654  | -6,358  | 949     | 1,175  
|2012                                                                                                                              | 5,715   | 2,772   | 16,963  | 9,218   | 10,993  | 6,246   | 6,133   | 4,934   | 1,813   | 2,511   | -4,163  | -766   
|2013                                                                                                                              | -1,752  | -7,147  | -18,160 | -11,767 | -14,327 | -8,820  | -7,918  | -10,359 | -6,916  | -8,303  | -7,397  | -13,824
|2014                                                                                                                              | -17,017 | -5,927  | -3,160  | -5,833  | -3,505  | -2,863  | 432     | 3,261   | 2,820   | 7,711   | 4,416   | 10,276 
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|2015                                                                                                                              | 18,941  | 10,557  | 13,020  | 10,570  | 10,632  | 4,638   | 1,906   | -2,908  | -4,131  | -6,939  | 5,451   | 10,834 
|2016                                                                                                                              | 4,759   | 12,589  | 8,399   | 4,856   | 1,676   | 3,856   | -389    | -1,275  | 2,851   | 3,778   | 1,942   | -5,994 
|2017                                                                                                                              | 4,221   | 11,578  | 1,691   | 2,092   | -6,450  | -5,845  | -9,105  | -8,085  | -8,143  | -5,661  | -4,604  | -8,655 
|2018                                                                                                                              | -13,964 | -14,053 | -10,138 | -13,311 | -10,151 | -12,929 | -9,374  | -9,256  | -7,842  | -4,747  | -10,222 | 3,130  
|2019                                                                                                                              | -3,920  | -5,907  | 4,241   | 14,293  | 22,590  | 24,638  | 17,701  | 16,041  | 11,936  | 7,827   | 10,431  | 14,079 
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|2020                                                                                                                              | 33,312  | 23,008  | 9,530   | -438    | -10,982 | -14,262 | -6,611  | 728     | 2,557   | 1,541   | 7,940   | 3,376  
|2021                                                                                                                              | -3,539  | 3,167   | 6,411   | 4,135   | 966     | -1,038  | -5,235  | -10,631 | -5,910  | 224     | -2,891  | -2,962 
|2022                                                                                                                              | -16,893 | -14,377 | -12,738 | -7,813  | -4,308  | -3,769  | 1,461   | 1,130   | -5,149  | -4,243  | -9,966  | -10,719
|2023                                                                                                                              | 14,719  | 9,536   | 3,430   | 2,231   | -1,180  | -1,062  | -3,416  | -4,286  | -3,390  | -2,677  | 9,066   | 13,584 
|2024                                                                                                                              | -4,090  | -630    | 6,123   | 7,013   | 9,209   |         |         |         |         |         |         |        
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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