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|View History: Monthly Download Data (XLS File)                                     
|View History: Monthly                                                               
|View History: Monthly                                                               
|View History:                                                                       
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|Mountain Region Natural Gas Total Underground Storage Capacity  (Million Cubic Feet)
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|Mountain Region Natural Gas Total Underground Storage Capacity  (Million Cubic Feet)
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|Year                                                                                                                              | Jan     | Feb     | Mar     | Apr     | May     | Jun     | Jul     | Aug     | Sep     | Oct     | Nov     | Dec    
|--------------------------------------------------------------------------------------------------------------------------------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | ------- | -------
|2013                                                                                                                              | 872,635 | 871,739 | 871,739 | 871,739 | 904,787 | 904,787 | 904,787 | 904,787 | 904,787 | 904,787 | 904,787 | 904,787
|2014                                                                                                                              | 904,787 | 904,787 | 904,787 | 904,787 | 904,787 | 904,787 | 909,887 | 912,887 | 912,887 | 912,887 | 912,887 | 912,887
|                                                                                                                                 
|2015                                                                                                                              | 912,887 | 912,887 | 912,887 | 912,887 | 912,941 | 912,941 | 912,941 | 912,941 | 912,931 | 912,931 | 912,931 | 912,931
|2016                                                                                                                              | 912,931 | 912,931 | 912,931 | 912,931 | 912,931 | 912,931 | 912,931 | 912,931 | 912,931 | 912,931 | 912,931 | 912,690
|2017                                                                                                                              | 912,614 | 912,614 | 912,614 | 921,914 | 921,914 | 921,914 | 921,914 | 921,914 | 921,914 | 921,914 | 921,914 | 920,306
|2018                                                                                                                              | 920,306 | 920,306 | 920,306 | 920,306 | 920,306 | 920,306 | 920,306 | 920,306 | 920,306 | 920,306 | 920,306 | 921,086
|2019                                                                                                                              | 921,086 | 929,086 | 905,038 | 905,038 | 905,038 | 906,038 | 906,038 | 906,038 | 906,038 | 906,038 | 906,038 | 906,038
|                                                                                                                                 
|2020                                                                                                                              | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086
|2021                                                                                                                              | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086
|2022                                                                                                                              | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086
|2023                                                                                                                              | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086 | 922,086
|2024                                                                                                                              | 922,086 | 922,086 | 922,086 | 934,086 | 934,086 |         |         |         |         |         |         |        
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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