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|View History:  Monthly  Annual Download Data (XLS File)                 
|View History:  Monthly  Annual                                           
|View History:  Monthly  Annual                                           
|View History:                                                            
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|Washington Natural Gas Underground Storage Capacity  (Million Cubic Feet)
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|Washington Natural Gas Underground Storage Capacity  (Million Cubic Feet)
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|Year                                                                                                                              | Jan    | Feb    | Mar    | Apr    | May    | Jun    | Jul    | Aug    | Sep    | Oct    | Nov    | Dec   
|--------------------------------------------------------------------------------------------------------------------------------- | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------ | ------
|2002                                                                                                                              | 37,300 | 37,300 | 37,300 | 37,300 | 37,300 | 37,300 | 37,300 | 37,300 | 37,300 | 37,300 | 37,720 | 37,720
|2003                                                                                                                              | 37,720 | 37,720 | 37,720 | 37,720 | 37,720 | 38,969 | 38,969 | 38,969 | 39,628 | 39,628 | 39,628 | 39,628
|2004                                                                                                                              | 39,628 | 39,628 | 39,628 | 39,628 | 39,628 | 39,628 | 39,628 | 39,628 | 39,628 | 40,247 | 40,247 | 40,247
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|2005                                                                                                                              | 40,247 | 40,247 | 40,247 | 40,247 | 40,247 | 40,247 | 40,247 | 40,247 | 40,247 | 40,247 | 40,247 | 40,247
|2006                                                                                                                              | 40,247 | 40,247 | 40,247 | 40,247 | 40,247 | 40,247 | 40,247 | 40,247 | 40,247 | 42,191 | 42,191 | 42,191
|2007                                                                                                                              | 42,191 | 42,191 | 42,191 | 42,191 | 42,191 | 42,191 | 42,191 | 42,191 | 43,316 | 43,316 | 43,316 | 43,316
|2008                                                                                                                              | 43,316 | 43,316 | 43,316 | 43,316 | 43,316 | 43,316 | 43,316 | 43,316 | 43,316 | 43,316 | 39,341 | 39,341
|2009                                                                                                                              | 39,341 | 39,341 | 39,341 | 39,341 | 39,341 | 39,341 | 39,341 | 39,341 | 39,341 | 39,341 | 39,341 | 39,210
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|2010                                                                                                                              | 39,210 | 39,210 | 39,210 | 39,210 | 39,210 | 39,210 | 39,210 | 39,210 | 39,210 | 39,210 | 39,210 | 39,210
|2011                                                                                                                              | 39,210 | 39,210 | 39,210 | 39,210 | 39,210 | 39,210 | 39,210 | 39,210 | 39,210 | 41,309 | 41,309 | 41,309
|2012                                                                                                                              | 46,595 | 46,637 | 46,637 | 46,637 | 46,781 | 44,829 | 44,829 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900
|2013                                                                                                                              | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900
|2014                                                                                                                              | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900
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|2015                                                                                                                              | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900
|2016                                                                                                                              | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900
|2017                                                                                                                              | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900
|2018                                                                                                                              | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900
|2019                                                                                                                              | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900
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|2020                                                                                                                              | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900
|2021                                                                                                                              | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900
|2022                                                                                                                              | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900
|2023                                                                                                                              | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 | 46,900
|2024                                                                                                                              | 46,900 | 46,900 | 46,900 | 46,900 | 46,900 |        |        |        |        |        |        |       
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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