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|View History: Monthly Download Data (XLS File)                                    
|View History: Monthly                                                              
|View History: Monthly                                                              
|View History:                                                                      
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|Midwest Region Natural Gas Total Underground Storage Capacity  (Million Cubic Feet)
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|Midwest 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                                                                                                                              | 2,720,465 | 2,720,436 | 2,720,436 | 2,720,436 | 2,720,881 | 2,720,881 | 2,721,231 | 2,721,231 | 2,721,231 | 2,721,231 | 2,721,231 | 2,721,231
|2014                                                                                                                              | 2,721,231 | 2,721,231 | 2,721,231 | 2,721,231 | 2,721,231 | 2,721,231 | 2,721,231 | 2,721,231 | 2,721,231 | 2,723,336 | 2,725,497 | 2,725,535
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|2015                                                                                                                              | 2,727,987 | 2,727,987 | 2,727,987 | 2,727,987 | 2,727,987 | 2,727,987 | 2,727,987 | 2,718,987 | 2,718,288 | 2,719,655 | 2,720,487 | 2,720,487
|2016                                                                                                                              | 2,720,487 | 2,720,487 | 2,720,487 | 2,720,487 | 2,720,487 | 2,720,517 | 2,720,517 | 2,720,517 | 2,720,517 | 2,720,718 | 2,720,598 | 2,720,798
|2017                                                                                                                              | 2,720,938 | 2,720,938 | 2,721,215 | 2,721,215 | 2,721,215 | 2,721,215 | 2,721,215 | 2,721,215 | 2,721,215 | 2,721,543 | 2,725,119 | 2,730,105
|2018                                                                                                                              | 2,727,074 | 2,727,068 | 2,727,368 | 2,727,368 | 2,727,265 | 2,727,265 | 2,727,265 | 2,727,265 | 2,727,265 | 2,727,395 | 2,727,496 | 2,727,598
|2019                                                                                                                              | 2,727,748 | 2,726,993 | 2,726,993 | 2,726,993 | 2,726,843 | 2,726,843 | 2,726,843 | 2,727,943 | 2,729,143 | 2,729,923 | 2,729,973 | 2,729,939
|                                                                                                                                 
|2020                                                                                                                              | 2,729,876 | 2,729,876 | 2,729,876 | 2,729,876 | 2,729,876 | 2,729,876 | 2,729,876 | 2,729,876 | 2,729,876 | 2,731,798 | 2,732,068 | 2,732,146
|2021                                                                                                                              | 2,732,146 | 2,732,146 | 2,732,146 | 2,732,146 | 2,732,146 | 2,732,146 | 2,732,146 | 2,732,146 | 2,732,146 | 2,732,647 | 2,736,037 | 2,736,515
|2022                                                                                                                              | 2,736,515 | 2,736,515 | 2,736,515 | 2,736,515 | 2,736,515 | 2,736,515 | 2,736,515 | 2,736,515 | 2,736,515 | 2,736,745 | 2,738,266 | 2,737,037
|2023                                                                                                                              | 2,737,037 | 2,737,037 | 2,737,037 | 2,740,513 | 2,741,523 | 2,741,523 | 2,741,523 | 2,741,523 | 2,741,523 | 2,741,726 | 2,741,926 | 2,741,938
|2024                                                                                                                              | 2,741,938 | 2,741,938 | 2,741,938 | 2,741,938 | 2,741,938 |           |           |           |           |           |           |          
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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