Philadelphia CountyPower Outage History
What this grade means
Top 20% most reliable nationally — infrequent, short outages. This county ranks in the most reliable fifth of all US counties in our dataset, based on 12 years of real DOE outage records: outages happen less often here, and when they do occur they tend to be resolved quickly compared to the rest of the country. Baseline outage risk is low, though a severe local storm can still occasionally cause a longer-than-usual outage regardless of the long-term track record.
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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Philadelphia County, Pennsylvania that day.
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).
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 |
Most reliable counties nationally
The top 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | South Dakota | A | 100th |
| Clearwater County | Minnesota | A | 99th |
| Limestone County | Alabama | A | 99th |
Least reliable counties nationally
The bottom 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | West Virginia | F | 0th |
| Lincoln County | West Virginia | F | 0th |
| Cameron Parish | Louisiana | F | 0th |
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.