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|View History: Monthly Download Data (XLS File)                     
|View History: Monthly                                               
|View History: Monthly                                               
|View History:                                                       
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|Montana Natural Gas Underground Storage Volume  (Million Cubic Feet)
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|Montana Natural Gas Underground Storage Volume  (Million Cubic Feet)
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|Year                                                                                                                              | Jan     | Feb     | Mar     | Apr     | May     | Jun     | Jul     | Aug     | Sep     | Oct     | Nov     | Dec    
|--------------------------------------------------------------------------------------------------------------------------------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | -------
|1990                                                                                                                              | 293,785 | 290,491 | 289,197 | 288,193 | 293,815 | 288,808 | 290,947 | 293,015 | 295,663 | 296,921 | 295,421 | 290,602
|1991                                                                                                                              | 289,270 | 287,858 | 286,548 | 286,491 | 287,718 | 288,959 | 290,667 | 292,107 | 292,226 | 290,844 | 288,112 | 284,559
|1992                                                                                                                              | 281,148 | 279,325 | 278,909 | 279,042 | 280,038 | 280,751 | 281,777 | 282,543 | 282,117 | 280,760 | 277,412 | 271,811
|1993                                                                                                                              | 266,711 | 262,291 | 259,532 | 257,822 | 256,665 | 255,940 | 257,149 | 257,450 | 257,904 | 257,816 | 253,710 | 250,503
|1994                                                                                                                              | 246,679 | 239,940 | 238,777 | 237,993 | 238,931 | 240,738 | 242,090 | 243,176 | 244,948 | 245,981 | 244,275 | 241,603
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|1995                                                                                                                              | 238,103 | 236,109 | 235,420 | 236,218 | 237,498 | 239,637 | 242,554 | 245,760 | 246,856 | 246,301 | 243,255 | 238,004
|1996                                                                                                                              | 231,752 | 228,315 | 224,438 | 223,794 | 223,014 | 225,717 | 228,978 | 232,480 | 235,999 | 235,664 | 230,909 | 225,405
|1997                                                                                                                              | 219,754 | 215,770 | 213,180 | 211,370 | 212,216 | 213,848 | 216,558 | 218,897 | 220,386 | 219,372 | 216,611 | 213,443
|1998                                                                                                                              | 209,021 | 206,467 | 203,450 | 203,226 | 205,797 | 207,821 | 210,115 | 214,639 | 218,878 | 220,410 | 217,805 | 213,891
|1999                                                                                                                              | 208,983 | 205,609 | 203,199 | 201,870 | 202,438 | 204,223 | 206,017 | 208,559 | 210,031 | 209,512 | 208,323 | 205,649
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|2000                                                                                                                              | 201,572 | 198,381 | 196,217 | 195,597 | 195,074 | 195,530 | 197,552 | 199,805 | 200,747 | 200,722 | 197,005 | 191,838
|2001                                                                                                                              | 187,630 | 183,126 | 181,496 | 181,498 | 184,400 | 188,433 | 193,956 | 198,923 | 203,775 | 205,348 | 204,857 | 200,967
|2002                                                                                                                              | 197,840 | 195,075 | 191,473 | 190,762 | 192,640 | 196,556 | 203,147 | 208,332 | 212,624 | 212,554 | 210,641 | 207,167
|2003                                                                                                                              | 202,814 | 198,083 | 194,417 | 194,596 | 195,637 | 197,357 | 199,674 | 201,657 | 203,208 | 204,794 | 202,090 | 198,607
|2004                                                                                                                              | 193,200 | 188,296 | 185,637 | 185,584 | 187,204 | 189,613 | 193,529 | 198,039 | 203,960 | 207,155 | 206,607 | 201,485
|                                                                                                                                 
|2005                                                                                                                              | 195,622 | 191,940 | 189,003 | 189,917 | 192,649 | 196,353 | 200,523 | 203,856 | 206,175 | 207,265 | 206,464 | 201,606
|2006                                                                                                                              | 198,538 | 194,410 | 191,970 | 195,270 | 201,820 | 208,271 | 214,492 | 220,011 | 225,774 | 228,277 | 224,587 | 219,499
|2007                                                                                                                              | 213,359 | 207,756 | 204,431 | 204,520 | 208,240 | 212,001 | 216,699 | 220,723 | 223,044 | 224,804 | 224,031 | 218,214
|2008                                                                                                                              | 210,930 | 204,890 | 200,029 | 197,448 | 198,190 | 199,704 | 202,434 | 205,738 | 208,953 | 209,196 | 207,634 | 201,009
|2009                                                                                                                              | 194,662 | 190,859 | 187,492 | 190,603 | 199,813 | 208,045 | 216,440 | 225,591 | 233,583 | 237,646 | 241,355 | 233,643
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|2010                                                                                                                              | 226,390 | 220,007 | 219,139 | 225,640 | 233,553 | 238,426 | 243,639 | 248,326 | 251,113 | 249,877 | 244,885 | 237,359
|2011                                                                                                                              | 229,490 | 222,171 | 216,389 | 214,812 | 214,922 | 216,801 | 219,925 | 223,229 | 225,775 | 227,357 | 224,786 | 219,804
|2012                                                                                                                              | 213,967 | 209,245 | 208,567 | 211,946 | 215,047 | 219,392 | 223,751 | 228,054 | 231,837 | 232,604 | 230,434 | 224,126
|2013                                                                                                                              | 216,809 | 211,649 | 207,638 | 205,601 | 207,626 | 210,385 | 214,435 | 219,447 | 224,995 | 224,335 | 218,817 | 211,200
|2014                                                                                                                              | 204,180 | 196,835 | 191,139 | 189,334 | 191,458 | 193,609 | 196,461 | 198,532 | 200,485 | 202,227 | 198,539 | 195,193
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|2015                                                                                                                              | 190,605 | 187,291 | 187,463 | 188,812 | 191,357 | 194,485 | 197,870 | 201,315 | 203,416 | 204,466 | 202,011 | 198,390
|2016                                                                                                                              | 193,997 | 191,940 | 192,710 | 196,653 | 201,855 | 206,763 | 210,023 | 213,488 | 215,679 | 216,461 | 214,059 | 205,755
|2017                                                                                                                              | 198,679 | 194,637 | 193,444 | 195,454 | 199,519 | 203,701 | 207,260 | 209,652 | 213,744 | 214,556 | 210,624 | 203,205
|2018                                                                                                                              | 196,187 | 189,718 | 185,370 | 185,960 | 190,044 | 194,067 | 198,238 | 202,704 | 205,155 | 202,676 | 199,076 | 195,975
|2019                                                                                                                              | 191,272 | 185,041 | 183,547 | 185,368 | 188,082 | 192,306 | 196,093 | 199,718 | 203,679 | 202,804 | 200,239 | 195,332
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|2020                                                                                                                              | 189,231 | 183,893 | 182,785 | 185,140 | 190,763 | 196,957 | 202,092 | 206,208 | 211,052 | 212,963 | 209,543 | 202,523
|2021                                                                                                                              | 195,280 | 188,575 | 185,347 | 186,407 | 189,279 | 192,968 | 196,841 | 202,073 | 207,586 | 209,676 | 207,156 | 200,320
|2022                                                                                                                              | 192,967 | 186,862 | 183,613 | 185,336 | 190,541 | 196,401 | 201,709 | 207,204 | 212,138 | 214,264 | 209,140 | 202,145
|2023                                                                                                                              | 197,203 | 191,579 | 187,443 | 190,030 | 195,497 | 201,455 | 207,415 | 211,100 | 213,730 | 214,635 | 212,147 | 207,166
|2024                                                                                                                              | 199,909 | 194,584 | 190,545 |         |         |         |         |         |         |         |         |        
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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: 5/31/2024                                                                                                          
|Next Release Date: 6/28/2024