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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 - Change in Working Gas from Same Month Previous Year  (Percent)
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|Montana Natural Gas in Underground Storage - Change in Working Gas from Same Month Previous Year  (Percent)
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|Year                                                                                                                              | Jan   | Feb   | Mar   | Apr   | May   | Jun   | Jul   | Aug   | Sep   | Oct   | Nov   | Dec  
|--------------------------------------------------------------------------------------------------------------------------------- | ----- | ----- | ----- | ----- | ----- | ----- | ----- | ----- | ----- | ----- | ----- | -----
|1991                                                                                                                              | -2.5  | -1.5  | -1.5  | -1.0  | -1.7  | 0.1   | -0.2  | -0.5  | -1.8  | -3.2  | -3.9  | -3.3 
|1992                                                                                                                              | -38.1 | -38.6 | -38.4 | -38.3 | -38.2 | -38.2 | -38.2 | -38.3 | -38.6 | -38.8 | -39.8 | -41.8
|1993                                                                                                                              | -13.0 | -15.6 | -17.8 | -19.4 | -21.2 | -22.4 | -22.0 | -22.3 | -21.6 | -20.7 | -20.8 | -19.6
|1994                                                                                                                              | -19.3 | -21.6 | -20.5 | -19.8 | -17.7 | -14.9 | -14.5 | -13.6 | -12.0 | -10.7 | -9.8  | -9.5 
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|1995                                                                                                                              | -9.6  | -5.3  | -4.7  | -2.5  | -2.0  | -1.5  | 0.6   | 3.4   | 2.5   | 0.4   | -1.3  | -4.9 
|1996                                                                                                                              | -9.0  | -11.4 | -16.2 | -18.1 | -20.7 | -19.2 | -18.0 | -16.9 | -13.6 | -13.4 | -16.2 | -17.7
|1997                                                                                                                              | -18.5 | -20.5 | -19.6 | -21.9 | -19.3 | -20.3 | -20.1 | -20.8 | -22.7 | -23.8 | -22.5 | -20.6
|1998                                                                                                                              | -20.5 | -19.2 | -21.2 | -18.5 | -14.3 | -12.9 | -13.1 | -8.2  | -2.8  | 2.0   | 2.5   | 1.0  
|1999                                                                                                                              | -0.1  | -2.2  | -0.7  | -3.7  | -8.7  | -8.9  | -9.6  | -12.8 | -17.2 | -20.5 | -18.8 | -17.7
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|2000                                                                                                                              | -17.8 | -18.9 | -19.5 | -18.1 | -21.0 | -23.6 | -21.9 | -21.2 | -21.7 | -20.8 | -27.6 | -36.0
|2001                                                                                                                              | -40.7 | -49.1 | -51.0 | -49.9 | -38.5 | -25.2 | -11.9 | -2.7  | 9.1   | 13.9  | 26.5  | 37.3 
|2002                                                                                                                              | -9.7  | -1.5  | -15.6 | -20.6 | -23.1 | -19.3 | -11.3 | -8.8  | -9.2  | -13.1 | -17.1 | -17.8
|2003                                                                                                                              | 27.2  | 19.4  | 25.0  | 34.8  | 24.2  | 5.9   | -13.7 | -22.1 | -27.2 | -22.1 | -25.8 | -28.7
|2004                                                                                                                              | -38.1 | -47.2 | -52.2 | -53.3 | -46.6 | -38.4 | -26.3 | -13.0 | 5.7   | 11.4  | 21.7  | 16.6 
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|2005                                                                                                                              | 18.7  | 37.2  | 47.2  | 61.2  | 62.6  | 60.7  | 46.6  | 29.8  | 8.7   | 0.4   | -0.5  | 0.5  
|2006                                                                                                                              | 17.0  | 18.4  | 28.3  | 46.9  | 64.8  | 66.8  | 63.4  | 63.7  | 70.8  | 73.1  | 64.8  | 77.5 
|2007                                                                                                                              | 74.0  | 83.9  | 92.6  | 55.2  | 27.5  | 12.5  | 6.1   | 1.7   | -5.8  | -7.0  | -1.2  | -3.1 
|2008                                                                                                                              | -7.0  | -9.8  | -17.0 | -27.2 | -33.8 | -36.7 | -37.3 | -35.5 | -31.6 | -33.7 | -36.0 | -43.3
|2009                                                                                                                              | -50.2 | -53.2 | -58.2 | -36.1 | 8.2   | 39.3  | 58.5  | 72.9  | 80.9  | 92.7  | 115.8 | 145.0
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|2010                                                                                                                              | 196.3 | 235.9 | 352.0 | 289.5 | 158.3 | 102.8 | 71.7  | 48.3  | 31.8  | 20.7  | 5.6   | 6.7  
|2011                                                                                                                              | 6.5   | 5.2   | -6.2  | -22.8 | -33.8 | -36.1 | -36.4 | -35.9 | -34.9 | -31.6 | -30.3 | -29.8
|2012                                                                                                                              | -30.4 | -29.6 | -21.1 | -8.1  | 0.3   | 6.8   | 9.2   | 10.8  | 12.8  | 10.7  | 12.2  | 10.5 
|2013                                                                                                                              | 8.0   | 7.8   | -3.1  | -19.0 | -20.3 | -22.0 | -20.6 | -17.4 | -12.8 | -15.3 | -22.4 | -28.3
|2014                                                                                                                              | -33.0 | -44.7 | -53.7 | -58.7 | -55.5 | -52.6 | -50.0 | -51.1 | -52.7 | -48.2 | -50.3 | -49.0
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|2015                                                                                                                              | -52.9 | -52.1 | -33.6 | -7.9  | -0.8  | 5.8   | 7.8   | 13.9  | 13.3  | 9.4   | 17.3  | 19.2 
|2016                                                                                                                              | 28.0  | 52.9  | 58.5  | 76.0  | 81.6  | 76.8  | 62.7  | 53.4  | 49.2  | 46.2  | 51.2  | 37.0 
|2017                                                                                                                              | 30.2  | 20.1  | 5.2   | -6.6  | -10.0 | -10.8 | -8.8  | -11.0 | -5.2  | -5.0  | -9.7  | -9.4 
|2018                                                                                                                              | -12.4 | -30.5 | -53.1 | -56.0 | -45.1 | -38.2 | -31.4 | -22.3 | -24.4 | -32.9 | -36.0 | -29.3
|2019                                                                                                                              | -34.1 | -51.6 | -43.9 | -22.9 | -26.6 | -18.5 | -16.5 | -16.9 | -9.7  | -4.1  | -4.6  | -15.8
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|2020                                                                                                                              | -26.1 | -39.5 | -44.7 | -21.3 | 19.9  | 25.3  | 25.8  | 23.6  | 23.4  | 36.9  | 44.4  | 44.8 
|2021                                                                                                                              | 63.2  | 124.5 | 92.6  | 15.9  | -20.0 | -25.8 | -24.4 | -15.9 | -11.0 | -10.2 | -8.2  | -10.1
|2022                                                                                                                              | -16.1 | -22.6 | -28.7 | -17.3 | 15.7  | 29.2  | 31.2  | 24.6  | 17.3  | 16.1  | 7.7   | 9.6  
|2023                                                                                                                              | 36.0  | 83.0  | 110.9 | 105.4 | 52.9  | 33.1  | 27.7  | 14.9  | 5.1   | 1.1   | 10.7  | 23.9 
|2024                                                                                                                              | 16.8  | 28.8  | 49.2  | 46.7  | 32.4  |       |       |       |       |       |       |      
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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