Montgomery County Power Outage History
2014–2025 · Pennsylvania
Worse than average — more frequent or longer outages than most counties. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jun 3, 2020 | 129 hrs | 141,915 (42%) | Thunderstorm Wind |
| Mar 2, 2018 | 80 hrs | 123,280 (37%) | Winter Weather |
| Jun 19, 2025 | 129 hrs | 70,526 (21%) | Thunderstorm Wind |
| Aug 4, 2020 | 89 hrs | 65,880 (20%) | Tropical Storm Isaias |
| Jul 21, 2021 | 60 hrs | 49,121 (15%) | Thunderstorm Wind |
Over the 12 years from 2014 to 2025, Montgomery County recorded 5,040 distinct power outage events, averaging 2.1 hours per event.
The single worst outage on record in Montgomery County started June 3, 2020 (Thunderstorm Wind), lasting 129 hours and leaving up to 141,915 customers without power (42% of the county) at its peak.
July has historically been the worst month for outages in Montgomery County, with 556 events recorded during that month across the dataset.
Based on this history, Montgomery County earns a Reliability Grade of D, placing it in the 28th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Pennsylvania
Counties with the closest reliability grade and national percentile to Montgomery County.
| County | Grade | National percentile |
|---|---|---|
| McKean County | D | 27th |
| Jefferson County | D | 28th |
| Columbia County | D | 27th |
| Warren County | D | 28th |
| Clarion County | D | 29th |
FAQ
How often does power go out in Montgomery County?
Between 2014 and 2025, Montgomery County recorded 5,040 outage events, averaging 2.1 hours each.
What is Montgomery County's reliability grade?
Montgomery County has a Reliability Grade of D, in the 28th national percentile.
What was the worst power outage in Montgomery County?
The worst outage on record started June 3, 2020 (Thunderstorm Wind), lasting 129 hours and affecting up to 141,915 customers.