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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 (Base Gas)  (Million Cubic Feet)
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|Montana 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                                                                                                                              | 109,573 | 109,573 | 109,573 | 109,573 | 112,573 | 109,573 | 109,573 | 109,573 | 109,573 | 109,573 | 109,573 | 109,573
|1991                                                                                                                              | 109,573 | 109,573 | 109,573 | 109,573 | 109,573 | 109,573 | 109,573 | 109,573 | 109,573 | 109,573 | 109,573 | 109,573
|1992                                                                                                                              | 169,892 | 169,892 | 169,892 | 169,892 | 169,892 | 169,892 | 169,892 | 169,892 | 169,892 | 169,892 | 169,892 | 169,892
|1993                                                                                                                              | 169,892 | 169,892 | 169,892 | 169,892 | 169,892 | 169,892 | 169,892 | 169,892 | 169,892 | 169,892 | 168,573 | 168,573
|1994                                                                                                                              | 168,573 | 167,495 | 167,495 | 167,491 | 167,491 | 167,491 | 167,491 | 167,491 | 167,491 | 167,491 | 167,491 | 167,491
|                                                                                                                                 
|1995                                                                                                                              | 167,491 | 167,491 | 167,491 | 167,491 | 167,491 | 167,491 | 167,491 | 167,491 | 167,491 | 167,491 | 167,491 | 167,491
|1996                                                                                                                              | 167,491 | 167,491 | 167,491 | 167,491 | 167,491 | 167,408 | 167,406 | 167,403 | 167,401 | 167,399 | 167,396 | 167,394
|1997                                                                                                                              | 167,392 | 167,391 | 167,389 | 167,388 | 167,386 | 167,385 | 167,385 | 167,383 | 167,382 | 167,380 | 167,379 | 167,378
|1998                                                                                                                              | 167,377 | 167,376 | 167,374 | 167,373 | 167,372 | 167,371 | 167,369 | 167,368 | 167,367 | 167,366 | 167,366 | 167,364
|1999                                                                                                                              | 167,363 | 167,362 | 167,361 | 167,359 | 167,359 | 167,358 | 167,357 | 167,356 | 167,356 | 167,355 | 167,354 | 167,353
|                                                                                                                                 
|2000                                                                                                                              | 167,352 | 167,351 | 167,350 | 167,350 | 167,349 | 167,348 | 167,347 | 167,347 | 167,346 | 167,346 | 167,345 | 167,344
|2001                                                                                                                              | 167,344 | 167,343 | 167,343 | 167,342 | 167,342 | 167,341 | 167,341 | 167,340 | 167,339 | 167,339 | 167,338 | 167,338
|2002                                                                                                                              | 179,526 | 179,526 | 179,526 | 179,526 | 179,524 | 179,526 | 179,526 | 179,526 | 179,526 | 179,526 | 179,526 | 179,526
|2003                                                                                                                              | 179,526 | 179,526 | 179,487 | 179,451 | 179,343 | 179,315 | 179,287 | 179,203 | 179,123 | 179,072 | 178,996 | 178,890
|2004                                                                                                                              | 178,781 | 178,506 | 178,506 | 178,506 | 178,506 | 178,506 | 178,506 | 178,506 | 178,506 | 178,506 | 178,505 | 178,505
|                                                                                                                                 
|2005                                                                                                                              | 178,505 | 178,505 | 178,505 | 178,505 | 178,505 | 178,505 | 178,505 | 178,505 | 178,505 | 178,505 | 178,505 | 178,505
|2006                                                                                                                              | 178,505 | 178,505 | 178,505 | 178,505 | 178,505 | 178,505 | 178,505 | 178,505 | 178,505 | 178,505 | 178,505 | 178,502
|2007                                                                                                                              | 178,502 | 178,502 | 178,502 | 178,502 | 178,502 | 178,502 | 178,502 | 178,502 | 178,502 | 178,502 | 178,502 | 178,502
|2008                                                                                                                              | 178,501 | 178,501 | 178,500 | 178,502 | 178,502 | 178,502 | 178,502 | 178,502 | 178,502 | 178,502 | 178,502 | 178,502
|2009                                                                                                                              | 178,502 | 178,502 | 178,502 | 178,502 | 178,502 | 178,502 | 178,502 | 178,502 | 178,502 | 178,502 | 178,502 | 178,502
|                                                                                                                                 
|2010                                                                                                                              | 178,502 | 178,502 | 178,502 | 178,502 | 178,501 | 178,501 | 178,501 | 178,501 | 178,501 | 178,500 | 178,500 | 178,500
|2011                                                                                                                              | 178,500 | 178,500 | 178,268 | 178,428 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500
|2012                                                                                                                              | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500
|2013                                                                                                                              | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500
|2014                                                                                                                              | 178,500 | 178,500 | 177,651 | 178,138 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500
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|2015                                                                                                                              | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,500 | 178,501 | 178,501
|2016                                                                                                                              | 178,501 | 178,501 | 178,501 | 178,501 | 178,501 | 178,501 | 178,501 | 178,501 | 178,501 | 178,501 | 178,501 | 178,501
|2017                                                                                                                              | 178,501 | 178,501 | 178,494 | 178,501 | 178,501 | 178,501 | 178,501 | 178,501 | 178,501 | 178,501 | 178,501 | 178,501
|2018                                                                                                                              | 178,501 | 178,501 | 178,352 | 178,501 | 178,501 | 178,501 | 178,501 | 178,501 | 178,501 | 178,501 | 178,501 | 178,501
|2019                                                                                                                              | 179,613 | 179,613 | 179,613 | 179,613 | 179,613 | 179,613 | 179,613 | 179,613 | 179,613 | 179,613 | 180,611 | 180,611
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|2020                                                                                                                              | 180,611 | 180,611 | 180,611 | 180,611 | 180,610 | 181,051 | 181,354 | 181,354 | 181,354 | 181,209 | 181,209 | 181,209
|2021                                                                                                                              | 181,209 | 181,209 | 181,159 | 181,159 | 181,159 | 181,159 | 181,159 | 181,159 | 181,159 | 181,159 | 181,159 | 181,159
|2022                                                                                                                              | 181,159 | 181,159 | 180,625 | 180,997 | 181,143 | 181,143 | 181,143 | 181,143 | 181,143 | 181,143 | 181,143 | 181,143
|2023                                                                                                                              | 181,143 | 181,143 | 181,143 | 181,117 | 181,127 | 181,143 | 181,143 | 181,143 | 181,143 | 181,143 | 181,143 | 181,143
|2024                                                                                                                              | 181,143 | 181,143 | 181,143 | 181,832 | 182,438 |         |         |         |         |         |         |        
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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