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|View History: Monthly Download Data (XLS File)                               
|View History: Monthly                                                         
|View History: Monthly                                                         
|View History:                                                                 
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|Washington Natural Gas in Underground Storage (Base Gas)  (Million Cubic Feet)
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|Washington 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                                                                                                                              | 21,300 | 21,300 | 21,300 | 21,300 | 0      | 21,300 | 21,300 | 21,300 | 21,300 | 21,300 | 21,300 |       
|1991                                                                                                                              | 21,300 | 21,300 | 21,300 | 21,300 | 21,300 | 21,300 | 21,300 | 21,300 | 21,300 | 18,800 | 18,800 | 18,800
|1992                                                                                                                              | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800
|1993                                                                                                                              | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800
|1994                                                                                                                              | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800
|                                                                                                                                 
|1995                                                                                                                              | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 18,800 | 21,123
|1996                                                                                                                              | 21,413 | 21,683 | 21,963 | 22,200 | 22,200 | 22,200 | 21,852 | 20,062 | 21,518 | 21,728 | 22,029 | 22,200
|1997                                                                                                                              | 22,096 | 22,096 | 22,096 | 22,096 | 22,096 | 22,096 | 22,096 | 22,096 | 22,096 | 22,096 | 22,096 | 22,096
|1998                                                                                                                              | 22,096 | 22,096 | 22,096 | 22,096 | 22,096 | 22,096 | 22,096 | 22,096 | 22,096 | 22,096 | 22,096 | 22,096
|1999                                                                                                                              | 22,096 | 21,200 | 21,496 | 21,596 | 21,825 | 22,133 | 22,201 | 19,000 | 19,000 | 19,000 | 19,000 | 19,000
|                                                                                                                                 
|2000                                                                                                                              | 19,000 | 19,000 | 19,000 | 19,000 | 19,000 | 19,000 | 19,000 | 19,000 | 19,000 | 19,000 | 19,000 | 19,000
|2001                                                                                                                              | 19,000 | 19,000 | 19,000 | 19,000 | 19,000 | 19,000 | 19,000 | 19,000 | 19,000 | 19,000 | 19,000 | 19,000
|2002                                                                                                                              | 19,000 | 19,000 | 19,000 | 19,000 | 19,000 | 19,000 | 19,000 | 19,000 | 19,168 | 19,244 | 19,328 | 19,425
|2003                                                                                                                              | 19,490 | 19,547 | 19,597 | 19,626 | 19,668 | 19,745 | 19,821 | 19,886 | 19,931 | 19,981 | 20,037 | 20,097
|2004                                                                                                                              | 20,142 | 20,179 | 20,220 | 20,262 | 20,298 | 20,333 | 20,364 | 20,395 | 20,433 | 20,461 | 20,494 | 20,530
|                                                                                                                                 
|2005                                                                                                                              | 20,556 | 20,585 | 20,613 | 20,640 | 20,672 | 20,704 | 20,751 | 20,797 | 20,843 | 20,876 | 20,918 | 20,955
|2006                                                                                                                              | 20,992 | 21,020 | 21,057 | 21,099 | 21,147 | 21,190 | 21,232 | 21,278 | 21,320 | 21,344 | 21,373 | 21,407
|2007                                                                                                                              | 21,433 | 21,462 | 21,494 | 21,528 | 21,562 | 21,599 | 21,644 | 21,682 | 21,714 | 21,752 | 21,785 | 21,816
|2008                                                                                                                              | 21,838 | 21,870 | 21,902 | 21,936 | 21,967 | 21,095 | 21,120 | 21,154 | 21,169 | 21,204 | 21,233 | 21,255
|2009                                                                                                                              | 21,273 | 21,291 | 21,308 | 21,328 | 21,362 | 21,392 | 21,422 | 21,455 | 21,481 | 21,511 | 21,548 | 21,576
|                                                                                                                                 
|2010                                                                                                                              | 21,600 | 21,624 | 21,653 | 21,683 | 21,709 | 21,738 | 21,768 | 21,797 | 21,821 | 21,842 | 21,867 | 21,894
|2011                                                                                                                              | 21,920 | 21,942 | 21,967 | 21,991 | 22,016 | 22,038 | 22,060 | 22,083 | 22,104 | 22,120 | 22,140 | 22,160
|2012                                                                                                                              | 22,178 | 22,195 | 22,213 | 22,233 | 22,252 | 22,271 | 22,289 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300
|2013                                                                                                                              | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300
|2014                                                                                                                              | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300
|                                                                                                                                 
|2015                                                                                                                              | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300
|2016                                                                                                                              | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300
|2017                                                                                                                              | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300
|2018                                                                                                                              | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300
|2019                                                                                                                              | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300
|                                                                                                                                 
|2020                                                                                                                              | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300
|2021                                                                                                                              | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300
|2022                                                                                                                              | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300
|2023                                                                                                                              | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 | 22,300
|2024                                                                                                                              | 22,300 | 22,300 | 22,300 | 22,300 | 22,300 |        |        |        |        |        |        |       
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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