Allegheny County Power Outage History
2014–2025 · Pennsylvania
Average — typical outage frequency and duration nationally. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Apr 29, 2025 | 218 hrs | 270,977 (41%) | Thunderstorm Wind |
| Jun 17, 2024 | 70 hrs | 84,962 (13%) | Thunderstorm Wind |
| Feb 24, 2019 | 105 hrs | 58,700 (9%) | Winter Weather |
| Dec 30, 2024 | 48 hrs | 55,570 (8%) | Unnamed event |
| Mar 25, 2023 | 54 hrs | 46,195 (7%) | Strong Wind |
Over the 12 years from 2014 to 2025, Allegheny County recorded 4,323 distinct power outage events, averaging 2.9 hours per event.
The single worst outage on record in Allegheny County started April 29, 2025 (Thunderstorm Wind), lasting 218 hours and leaving up to 270,977 customers without power (41% of the county) at its peak.
June has historically been the worst month for outages in Allegheny County, with 546 events recorded during that month across the dataset.
Based on this history, Allegheny County earns a Reliability Grade of C, placing it in the 42nd 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 Allegheny County.
| County | Grade | National percentile |
|---|---|---|
| Westmoreland County | C | 41st |
| Tioga County | C | 41st |
| Juniata County | C | 43rd |
| Beaver County | C | 41st |
| Fayette County | C | 41st |
FAQ
How often does power go out in Allegheny County?
Between 2014 and 2025, Allegheny County recorded 4,323 outage events, averaging 2.9 hours each.
What is Allegheny County's reliability grade?
Allegheny County has a Reliability Grade of C, in the 42nd national percentile.
What was the worst power outage in Allegheny County?
The worst outage on record started April 29, 2025 (Thunderstorm Wind), lasting 218 hours and affecting up to 270,977 customers.