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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 in Underground Storage (Working Gas)  (Million Cubic Feet)
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|Montana 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                                                                                                                              | 184,212 | 180,918 |         | 178,620 | 181,242 | 179,235 | 181,374 | 183,442 |         | 187,348 | 185,848 | 181,029
|1991                                                                                                                              | 179,697 | 178,285 | 176,975 | 176,918 | 178,145 | 179,386 | 181,094 | 182,534 | 182,653 | 181,271 | 178,539 | 174,986
|1992                                                                                                                              | 111,256 | 109,433 | 109,017 | 109,150 | 110,146 | 110,859 | 111,885 | 112,651 | 112,225 | 110,868 | 107,520 | 101,919
|1993                                                                                                                              | 96,819  | 92,399  | 89,640  | 87,930  | 86,773  | 86,048  | 87,257  | 87,558  | 88,012  | 87,924  | 85,137  | 81,930 
|1994                                                                                                                              | 78,106  | 72,445  | 71,282  | 70,501  | 71,440  | 73,247  | 74,599  | 75,685  | 77,456  | 78,490  | 76,784  | 74,111 
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|1995                                                                                                                              | 70,612  | 68,618  | 67,929  | 68,727  | 70,007  | 72,146  | 75,063  | 78,268  | 79,364  | 78,810  | 75,764  | 70,513 
|1996                                                                                                                              | 64,260  | 60,824  | 56,947  | 56,302  | 55,522  | 58,309  | 61,572  | 65,077  | 68,598  | 68,265  | 63,513  | 58,011 
|1997                                                                                                                              | 52,362  | 48,380  | 45,791  | 43,982  | 44,829  | 46,463  | 49,173  | 51,514  | 53,005  | 51,991  | 49,232  | 46,065 
|1998                                                                                                                              | 41,644  | 39,091  | 36,076  | 35,853  | 38,425  | 40,450  | 42,745  | 47,271  | 51,511  | 53,044  | 50,439  | 46,527 
|1999                                                                                                                              | 41,621  | 38,247  | 35,838  | 34,510  | 35,080  | 36,865  | 38,660  | 41,203  | 42,675  | 42,157  | 40,969  | 38,296 
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|2000                                                                                                                              | 34,220  | 31,030  | 28,867  | 28,247  | 27,725  | 28,182  | 30,205  | 32,459  | 33,401  | 33,376  | 29,660  | 24,494 
|2001                                                                                                                              | 20,286  | 15,783  | 14,153  | 14,155  | 17,058  | 21,092  | 26,616  | 31,582  | 36,436  | 38,009  | 37,519  | 33,630 
|2002                                                                                                                              | 18,313  | 15,548  | 11,947  | 11,237  | 13,116  | 17,031  | 23,621  | 28,806  | 33,098  | 33,029  | 31,115  | 27,642 
|2003                                                                                                                              | 23,289  | 18,557  | 14,929  | 15,145  | 16,294  | 18,042  | 20,386  | 22,454  | 24,086  | 25,722  | 23,095  | 19,716 
|2004                                                                                                                              | 14,418  | 9,790   | 7,131   | 7,078   | 8,698   | 11,107  | 15,023  | 19,533  | 25,454  | 28,649  | 28,101  | 22,980 
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|2005                                                                                                                              | 17,117  | 13,434  | 10,498  | 11,412  | 14,143  | 17,848  | 22,018  | 25,351  | 27,670  | 28,760  | 27,958  | 23,100 
|2006                                                                                                                              | 20,033  | 15,904  | 13,465  | 16,764  | 23,315  | 29,766  | 35,987  | 41,506  | 47,269  | 49,772  | 46,082  | 40,996 
|2007                                                                                                                              | 34,857  | 29,253  | 25,929  | 26,017  | 29,737  | 33,499  | 38,197  | 42,221  | 44,542  | 46,303  | 45,529  | 39,712 
|2008                                                                                                                              | 32,429  | 26,390  | 21,529  | 18,946  | 19,688  | 21,202  | 23,932  | 27,236  | 30,451  | 30,694  | 29,132  | 22,507 
|2009                                                                                                                              | 16,160  | 12,357  | 8,990   | 12,102  | 21,311  | 29,543  | 37,939  | 47,089  | 55,081  | 59,144  | 62,853  | 55,141 
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|2010                                                                                                                              | 47,888  | 41,505  | 40,637  | 47,138  | 55,052  | 59,924  | 65,138  | 69,825  | 72,613  | 71,377  | 66,385  | 58,859 
|2011                                                                                                                              | 50,990  | 43,671  | 38,121  | 36,384  | 36,422  | 38,301  | 41,425  | 44,729  | 47,275  | 48,857  | 46,286  | 41,304 
|2012                                                                                                                              | 35,467  | 30,745  | 30,067  | 33,446  | 36,547  | 40,892  | 45,251  | 49,554  | 53,337  | 54,104  | 51,934  | 45,626 
|2013                                                                                                                              | 38,309  | 33,149  | 29,138  | 27,101  | 29,126  | 31,885  | 35,935  | 40,947  | 46,495  | 45,835  | 40,318  | 32,700 
|2014                                                                                                                              | 25,680  | 18,335  | 13,488  | 11,196  | 12,958  | 15,109  | 17,961  | 20,032  | 21,985  | 23,727  | 20,039  | 16,693 
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|2015                                                                                                                              | 12,105  | 8,791   | 8,963   | 10,312  | 12,857  | 15,985  | 19,370  | 22,815  | 24,916  | 25,966  | 23,510  | 19,890 
|2016                                                                                                                              | 15,496  | 13,439  | 14,209  | 18,153  | 23,354  | 28,262  | 31,522  | 34,987  | 37,178  | 37,960  | 35,559  | 27,254 
|2017                                                                                                                              | 20,179  | 16,137  | 14,950  | 16,953  | 21,019  | 25,201  | 28,759  | 31,152  | 35,243  | 36,055  | 32,124  | 24,705 
|2018                                                                                                                              | 17,686  | 11,217  | 7,018   | 7,460   | 11,543  | 15,566  | 19,737  | 24,204  | 26,654  | 24,176  | 20,575  | 17,475 
|2019                                                                                                                              | 11,659  | 5,428   | 3,934   | 5,755   | 8,469   | 12,693  | 16,480  | 20,104  | 24,066  | 23,190  | 19,628  | 14,721 
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|2020                                                                                                                              | 8,620   | 3,282   | 2,174   | 4,529   | 10,153  | 15,906  | 20,738  | 24,854  | 29,698  | 31,754  | 28,334  | 21,314 
|2021                                                                                                                              | 14,071  | 7,366   | 4,188   | 5,248   | 8,120   | 11,810  | 15,682  | 20,914  | 26,427  | 28,517  | 25,997  | 19,161 
|2022                                                                                                                              | 11,808  | 5,703   | 2,987   | 4,339   | 9,398   | 15,259  | 20,567  | 26,061  | 30,995  | 33,121  | 27,997  | 21,002 
|2023                                                                                                                              | 16,060  | 10,436  | 6,300   | 8,913   | 14,370  | 20,312  | 26,272  | 29,957  | 32,588  | 33,492  | 31,005  | 26,023 
|2024                                                                                                                              | 18,766  | 13,441  | 9,402   | 13,078  | 19,020  |         |         |         |         |         |         |        
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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