Philadelphia County Power Outage History
2014–2025 · Pennsylvania
Top 20% most reliable nationally — infrequent, short outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jun 3, 2020 | 128 hrs | 43,823 (5%) | Thunderstorm Wind |
| Jun 23, 2015 | 19 hrs | 43,629 (5%) | Heat |
| Mar 7, 2017 | 12 hrs | 36,673 (5%) | Unnamed event |
| Aug 14, 2020 | 10 hrs | 32,597 (4%) | Unnamed event |
| Mar 2, 2018 | 81 hrs | 32,117 (4%) | Winter Weather |
Over the 12 years from 2014 to 2025, Philadelphia County recorded 7,787 distinct power outage events, averaging 2.0 hours per event.
The single worst outage on record in Philadelphia County started June 3, 2020 (Thunderstorm Wind), lasting 128 hours and leaving up to 43,823 customers without power (5% of the county) at its peak.
June has historically been the worst month for outages in Philadelphia County, with 826 events recorded during that month across the dataset.
Based on this history, Philadelphia County earns a Reliability Grade of A, placing it in the 83rd percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Philadelphia County's outage profile
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Similar counties in Pennsylvania
Counties with the closest reliability grade and national percentile to Philadelphia County.
| County | Grade | National percentile |
|---|---|---|
| Franklin County | A | 82nd |
| Dauphin County | A | 84th |
| Union County | A | 86th |
| Lancaster County | B | 80th |
| Luzerne County | B | 77th |
FAQ
How often does power go out in Philadelphia County?
Between 2014 and 2025, Philadelphia County recorded 7,787 outage events, averaging 2.0 hours each.
What is Philadelphia County's reliability grade?
Philadelphia County has a Reliability Grade of A, in the 83rd national percentile.
What was the worst power outage in Philadelphia County?
The worst outage on record started June 3, 2020 (Thunderstorm Wind), lasting 128 hours and affecting up to 43,823 customers.