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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 (Base Gas)  (Million Cubic Feet)
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|Illinois Natural Gas in Underground Storage (Base Gas)  (Million Cubic Feet)
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|Year                                                                                                                              | Jan     | Feb     | Mar     | Apr     | May     | Jun     | Jul     | Aug     | Sep     | Oct     | Nov     | Dec    
|--------------------------------------------------------------------------------------------------------------------------------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | -------
|1990                                                                                                                              | 571,959 | 571,959 | 571,959 | 571,959 | 572,425 | 572,423 | 572,421 | 572,421 | 572,419 | 572,419 | 573,776 | 577,424
|1991                                                                                                                              | 577,418 | 577,418 | 577,418 | 568,227 | 568,178 | 568,160 | 568,158 | 568,157 | 568,157 | 568,158 | 568,158 | 568,158
|1992                                                                                                                              | 576,257 | 576,227 | 576,227 | 576,227 | 576,227 | 576,227 | 576,227 | 576,234 | 576,234 | 577,202 | 577,202 | 579,715
|1993                                                                                                                              | 620,575 | 620,856 | 620,777 | 621,051 | 621,543 | 621,543 | 621,543 | 621,543 | 623,466 | 624,434 | 624,483 | 624,483
|1994                                                                                                                              | 624,627 | 624,627 | 624,579 | 624,777 | 624,777 | 624,777 | 624,777 | 624,777 | 624,777 | 624,777 | 624,777 | 625,262
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|1995                                                                                                                              | 625,262 | 625,262 | 623,587 | 622,897 | 653,428 | 653,428 | 653,428 | 653,428 | 653,428 | 653,428 | 653,428 | 653,428
|1996                                                                                                                              | 653,428 | 653,428 | 653,410 | 653,428 | 653,386 | 653,395 | 653,428 | 651,468 | 651,468 | 651,468 | 651,468 | 651,468
|1997                                                                                                                              | 651,468 | 651,468 | 651,468 | 651,467 | 651,467 | 651,467 | 651,466 | 651,468 | 651,468 | 651,404 | 651,404 | 651,403
|1998                                                                                                                              | 651,403 | 651,403 | 651,403 | 650,968 | 649,897 | 649,967 | 649,897 | 649,968 | 649,968 | 649,968 | 649,968 | 649,968
|1999                                                                                                                              | 667,226 | 668,662 | 668,660 | 668,659 | 668,650 | 668,642 | 668,622 | 668,605 | 666,907 | 666,901 | 670,098 | 671,781
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|2000                                                                                                                              | 671,781 | 671,781 | 675,781 | 675,781 | 675,778 | 675,870 | 675,870 | 675,870 | 675,870 | 675,729 | 676,369 | 669,280
|2001                                                                                                                              | 669,070 | 668,981 | 668,481 | 665,721 | 668,481 | 668,481 | 668,482 | 668,482 | 668,482 | 668,482 | 668,482 | 668,482
|2002                                                                                                                              | 668,482 | 666,632 | 666,632 | 666,632 | 666,632 | 666,632 | 666,632 | 666,632 | 666,632 | 666,632 | 666,632 | 666,632
|2003                                                                                                                              | 666,839 | 666,838 | 670,940 | 666,338 | 666,338 | 666,338 | 666,338 | 666,338 | 666,338 | 666,338 | 666,338 | 666,338
|2004                                                                                                                              | 668,478 | 668,478 | 664,585 | 664,585 | 664,474 | 664,474 | 664,474 | 664,474 | 672,320 | 672,320 | 672,320 | 672,320
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|2005                                                                                                                              | 672,320 | 672,664 | 672,320 | 672,320 | 672,320 | 672,320 | 672,320 | 672,320 | 673,068 | 673,068 | 673,068 | 673,068
|2006                                                                                                                              | 673,068 | 673,361 | 673,361 | 673,261 | 673,261 | 673,261 | 673,261 | 673,261 | 674,484 | 674,484 | 674,484 | 674,697
|2007                                                                                                                              | 674,697 | 674,697 | 678,329 | 678,329 | 678,329 | 678,329 | 678,329 | 678,329 | 678,329 | 678,329 | 678,329 | 679,607
|2008                                                                                                                              | 679,535 | 679,535 | 679,653 | 679,653 | 679,653 | 680,168 | 680,168 | 680,168 | 680,586 | 680,586 | 681,443 | 681,672
|2009                                                                                                                              | 684,069 | 687,205 | 687,298 | 686,964 | 687,298 | 691,226 | 687,769 | 687,202 | 687,635 | 688,235 | 688,275 | 688,510
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|2010                                                                                                                              | 689,076 | 688,550 | 688,631 | 688,879 | 689,068 | 689,709 | 689,709 | 689,709 | 690,137 | 690,920 | 689,937 | 691,023
|2011                                                                                                                              | 691,023 | 691,023 | 690,651 | 690,295 | 691,011 | 691,495 | 691,495 | 691,495 | 691,907 | 694,889 | 694,889 | 695,103
|2012                                                                                                                              | 696,088 | 696,088 | 696,169 | 695,715 | 695,185 | 696,593 | 696,593 | 696,593 | 696,969 | 696,969 | 698,358 | 698,574
|2013                                                                                                                              | 698,574 | 698,574 | 698,650 | 696,834 | 698,262 | 699,144 | 699,144 | 699,144 | 699,536 | 700,017 | 700,050 | 700,184
|2014                                                                                                                              | 700,184 | 700,184 | 699,958 | 699,352 | 700,240 | 700,721 | 700,721 | 700,721 | 701,148 | 700,350 | 700,402 | 700,576
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|2015                                                                                                                              | 700,576 | 700,576 | 700,637 | 700,098 | 699,984 | 701,159 | 701,159 | 701,159 | 701,532 | 701,732 | 701,762 | 701,925
|2016                                                                                                                              | 701,925 | 701,925 | 701,214 | 700,778 | 701,417 | 702,443 | 702,443 | 702,443 | 702,905 | 703,105 | 702,985 | 703,379
|2017                                                                                                                              | 703,379 | 703,379 | 703,684 | 702,958 | 703,372 | 704,110 | 704,110 | 704,110 | 704,593 | 704,845 | 704,925 | 705,201
|2018                                                                                                                              | 705,201 | 705,201 | 705,501 | 704,613 | 704,608 | 705,863 | 705,882 | 705,953 | 706,390 | 706,520 | 706,621 | 706,895
|2019                                                                                                                              | 706,895 | 706,895 | 706,375 | 705,678 | 706,365 | 707,450 | 707,450 | 708,550 | 710,151 | 710,931 | 710,981 | 711,150
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|2020                                                                                                                              | 711,150 | 711,150 | 711,192 | 710,391 | 710,380 | 711,655 | 711,642 | 711,655 | 712,099 | 712,372 | 712,642 | 712,818
|2021                                                                                                                              | 712,818 | 712,818 | 712,818 | 712,173 | 712,313 | 713,269 | 713,268 | 713,268 | 713,825 | 714,326 | 714,426 | 714,795
|2022                                                                                                                              | 714,795 | 714,795 | 714,216 | 714,795 | 714,274 | 715,252 | 715,252 | 715,252 | 715,792 | 716,020 | 716,070 | 716,418
|2023                                                                                                                              | 716,418 | 716,418 | 716,200 | 715,083 | 715,514 | 716,361 | 716,328 | 716,318 | 716,418 | 716,620 | 716,820 | 716,820
|2024                                                                                                                              | 716,820 | 716,820 | 716,584 | 715,979 | 716,522 |         |         |         |         |         |         |        
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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