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| Pennsylvania Natural Gas Count of Underground Storage Capacity (Number of Elements) | ||||||||
| Decade | Year-0 | Year-1 | Year-2 | Year-3 | Year-4 | Year-5 | Year-6 | Year-7 | Year-8 | Year-9 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1980's | 51 | |||||||||
| 1990's | 49 | 49 | 50 | 48 | 59 | 59 | 59 | 59 | 59 | 59 |
| 2000's | 58 | 59 | 57 | 50 | 49 | 49 | 49 | 50 | 50 | 51 |
| 2010's | 51 | 51 | 51 | 51 | 51 | 49 | 49 | 49 | 49 | 49 |
| 2020's | 49 | 49 | 49 | 49 |
| - = No Data Reported; -- = Not Applicable; NA = Not Available; W = Withheld to avoid disclosure of individual company data. |
| Release Date: 9/30/2025 |
| Next Release Date: 10/31/2025 |