Mercer 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 |
|---|---|---|---|
| Mar 25, 2023 | 108 hrs | 26,180 (50%) | Thunderstorm Wind |
| Jun 23, 2018 | 2 hrs | 24,869 (48%) | Unnamed event |
| Oct 2, 2016 | 1 hrs | 19,420 (37%) | Unnamed event |
| Apr 1, 2023 | 101 hrs | 18,186 (35%) | Strong Wind |
| May 22, 2022 | 56 hrs | 15,053 (29%) | Thunderstorm Wind |
Over the 12 years from 2014 to 2025, Mercer County recorded 706 distinct power outage events, averaging 3.2 hours per event.
The single worst outage on record in Mercer County started March 25, 2023 (Thunderstorm Wind), lasting 108 hours and leaving up to 26,180 customers without power (50% of the county) at its peak.
June has historically been the worst month for outages in Mercer County, with 101 events recorded during that month across the dataset.
Based on this history, Mercer County earns a Reliability Grade of D, placing it in the 38th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Mercer County's outage profile
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Similar counties in Pennsylvania
Counties with the closest reliability grade and national percentile to Mercer County.
| County | Grade | National percentile |
|---|---|---|
| Clearfield County | D | 37th |
| Elk County | D | 36th |
| Fayette County | C | 41st |
| Beaver County | C | 41st |
| Cambria County | D | 35th |
FAQ
How often does power go out in Mercer County?
Between 2014 and 2025, Mercer County recorded 706 outage events, averaging 3.2 hours each.
What is Mercer County's reliability grade?
Mercer County has a Reliability Grade of D, in the 38th national percentile.
What was the worst power outage in Mercer County?
The worst outage on record started March 25, 2023 (Thunderstorm Wind), lasting 108 hours and affecting up to 26,180 customers.