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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 (Working Gas)  (Million Cubic Feet)
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|Illinois Natural Gas in Underground Storage (Working Gas)  (Million Cubic Feet)
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|Year                                                                                                                              | Jan     | Feb     | Mar     | Apr     | May     | Jun     | Jul     | Aug     | Sep     | Oct     | Nov     | Dec    
|--------------------------------------------------------------------------------------------------------------------------------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | -------
|1990                                                                                                                              | 234,149 | 182,982 | 149,826 | 145,903 | 177,193 | 210,075 | 239,633 | 275,310 | 309,341 | 328,106 | 329,864 | 292,842
|1991                                                                                                                              | 224,217 | 175,723 | 150,281 | 152,048 | 183,462 | 213,723 | 242,377 | 276,319 | 309,328 | 336,048 | 317,183 | 283,100
|1992                                                                                                                              | 214,872 | 167,256 | 140,681 | 132,922 | 166,585 | 198,351 | 228,870 | 267,309 | 302,100 | 328,395 | 310,252 | 264,393
|1993                                                                                                                              | 163,300 | 114,381 | 89,600  | 92,163  | 125,356 | 158,219 | 189,002 | 222,776 | 258,991 | 283,523 | 274,172 | 230,208
|1994                                                                                                                              | 157,199 | 113,092 | 98,529  | 97,958  | 121,798 | 151,412 | 184,055 | 218,595 | 255,984 | 282,845 | 274,095 | 241,584
|                                                                                                                                 
|1995                                                                                                                              | 178,160 | 120,195 | 97,724  | 93,988  | 92,541  | 121,374 | 151,483 | 183,573 | 215,512 | 246,439 | 232,236 | 188,151
|1996                                                                                                                              | 120,519 | 79,256  | 56,219  | 59,154  | 86,393  | 118,776 | 154,567 | 190,009 | 226,947 | 255,683 | 239,749 | 203,700
|1997                                                                                                                              | 138,998 | 98,793  | 75,078  | 75,280  | 99,145  | 127,551 | 160,637 | 196,838 | 233,525 | 261,895 | 260,426 | 214,951
|1998                                                                                                                              | 156,932 | 120,860 | 92,702  | 93,474  | 117,747 | 146,257 | 173,791 | 205,365 | 238,735 | 267,807 | 258,346 | 216,601
|1999                                                                                                                              | 135,873 | 94,105  | 67,346  | 56,392  | 82,340  | 108,258 | 134,603 | 167,871 | 206,322 | 237,949 | 231,869 | 189,881
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|2000                                                                                                                              | 132,190 | 96,786  | 84,010  | 71,004  | 84,301  | 117,369 | 146,094 | 174,487 | 206,117 | 240,807 | 214,939 | 172,041
|2001                                                                                                                              | 129,212 | 85,661  | 71,411  | 82,609  | 114,242 | 140,178 | 160,520 | 184,198 | 217,720 | 243,762 | 267,342 | 219,574
|2002                                                                                                                              | 161,736 | 113,770 | 86,779  | 77,962  | 104,139 | 141,616 | 170,069 | 206,423 | 244,947 | 274,666 | 255,261 | 203,035
|2003                                                                                                                              | 132,405 | 82,065  | 67,106  | 80,514  | 109,713 | 142,320 | 174,663 | 204,926 | 238,005 | 270,223 | 255,645 | 212,175
|2004                                                                                                                              | 144,641 | 99,863  | 71,185  | 71,924  | 99,617  | 134,068 | 168,863 | 202,952 | 234,082 | 264,621 | 250,163 | 198,299
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|2005                                                                                                                              | 132,232 | 83,972  | 55,493  | 53,698  | 82,694  | 117,194 | 153,297 | 190,315 | 227,865 | 261,643 | 250,717 | 198,093
|2006                                                                                                                              | 153,300 | 94,611  | 64,245  | 63,063  | 89,354  | 121,953 | 155,762 | 191,932 | 230,311 | 264,060 | 250,715 | 203,910
|2007                                                                                                                              | 135,524 | 81,300  | 66,832  | 62,066  | 92,454  | 124,123 | 158,037 | 191,475 | 230,656 | 265,789 | 246,542 | 193,583
|2008                                                                                                                              | 125,404 | 70,986  | 50,370  | 50,418  | 75,957  | 111,563 | 146,306 | 186,643 | 225,689 | 261,541 | 247,238 | 192,434
|2009                                                                                                                              | 127,374 | 77,570  | 52,447  | 49,152  | 79,678  | 112,915 | 148,576 | 187,702 | 228,180 | 264,630 | 254,317 | 199,106
|                                                                                                                                 
|2010                                                                                                                              | 131,031 | 78,002  | 56,665  | 64,056  | 93,880  | 125,022 | 152,376 | 188,058 | 226,231 | 265,070 | 255,567 | 201,427
|2011                                                                                                                              | 128,872 | 76,400  | 46,800  | 52,708  | 79,932  | 113,389 | 144,722 | 184,768 | 223,348 | 258,711 | 256,516 | 202,602
|2012                                                                                                                              | 134,587 | 79,171  | 63,763  | 61,926  | 90,925  | 119,634 | 150,855 | 189,702 | 225,161 | 261,222 | 252,353 | 201,836
|2013                                                                                                                              | 132,835 | 72,024  | 45,603  | 50,160  | 76,598  | 110,815 | 142,938 | 179,343 | 218,245 | 252,919 | 244,957 | 188,012
|2014                                                                                                                              | 115,818 | 66,097  | 42,443  | 44,327  | 73,093  | 107,952 | 143,370 | 182,604 | 221,065 | 260,629 | 249,373 | 198,287
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|2015                                                                                                                              | 134,758 | 76,654  | 55,463  | 54,896  | 83,725  | 112,590 | 145,276 | 179,696 | 216,934 | 253,690 | 254,824 | 209,121
|2016                                                                                                                              | 139,517 | 89,243  | 63,862  | 59,753  | 85,401  | 116,447 | 144,886 | 178,422 | 219,785 | 257,468 | 256,765 | 203,126
|2017                                                                                                                              | 143,738 | 100,821 | 65,553  | 61,844  | 78,951  | 110,601 | 135,781 | 170,336 | 211,642 | 251,807 | 252,161 | 194,471
|2018                                                                                                                              | 129,774 | 86,768  | 55,415  | 48,533  | 68,800  | 97,672  | 126,407 | 161,080 | 203,800 | 247,060 | 241,940 | 197,601
|2019                                                                                                                              | 125,854 | 80,861  | 59,656  | 62,827  | 91,390  | 122,310 | 144,108 | 177,121 | 215,735 | 254,887 | 252,371 | 211,681
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|2020                                                                                                                              | 159,166 | 103,869 | 69,185  | 62,389  | 80,408  | 108,048 | 137,496 | 177,849 | 218,292 | 256,428 | 260,310 | 215,056
|2021                                                                                                                              | 155,627 | 107,036 | 75,596  | 66,523  | 81,374  | 107,010 | 132,261 | 167,218 | 212,382 | 256,652 | 257,419 | 212,095
|2022                                                                                                                              | 138,734 | 92,659  | 62,858  | 58,710  | 77,066  | 103,241 | 133,722 | 168,348 | 207,233 | 252,409 | 247,453 | 201,375
|2023                                                                                                                              | 153,452 | 102,194 | 66,288  | 60,941  | 75,887  | 102,179 | 130,307 | 164,062 | 203,843 | 249,732 | 256,519 | 214,959
|2024                                                                                                                              | 149,362 | 101,565 | 72,411  | 67,954  | 85,096  |         |         |         |         |         |         |        
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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