Delaware CountyPower Outage History
What this grade means
Worse than average — more frequent or longer outages than most counties. This county's recorded history shows more frequent outages and/or longer restoration times than most US counties over the same 12-year period. If you live here, it's worth taking backup power more seriously than an average household would.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Mar 2, 2018 | 81 hrs | 109,686 (40%) | Winter Storm |
| Jun 23, 2015 | 20 hrs | 107,229 (39%) | Heat |
| Jun 19, 2025 | 127 hrs | 74,815 (27%) | Thunderstorm Wind |
| Jun 24, 2015 | 23 hrs | 69,321 (25%) | Heat |
| Feb 16, 2025 | 73 hrs | 49,986 (18%) | Winter Weather |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Delaware County, Pennsylvania that day.
Over the 12 years from 2014 to 2025, Delaware County recorded 3,696 distinct power outage events, averaging 2.0 hours per event.
The single worst outage on record in Delaware County started March 2, 2018 (Winter Storm), lasting 81 hours and leaving up to 109,686 customers without power (40% of the county) at its peak.
July has historically been the worst month for outages in Delaware County, with 428 events recorded during that month across the dataset.
Based on this history, Delaware County earns a Reliability Grade of D, placing it in the 32nd percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Pennsylvania
Counties with the closest reliability grade and national percentile to Delaware County.
| County | Grade | National percentile |
|---|---|---|
| Washington County | D | 31st |
| Crawford County | D | 31st |
| Bradford County | D | 33rd |
| Butler County | D | 34th |
| Potter County | D | 30th |
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 Delaware County?
Between 2014 and 2025, Delaware County recorded 3,696 outage events, averaging 2.0 hours each.
What is Delaware County's reliability grade?
Delaware County has a Reliability Grade of D, in the 32nd national percentile.
What was the worst power outage in Delaware County?
The worst outage on record started March 2, 2018 (Winter Storm), lasting 81 hours and affecting up to 109,686 customers.