Delaware County Power Outage History
2014–2025 · Ohio
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 |
|---|---|---|---|
| Sep 11, 2020 | 0 hrs | 34,166 (36%) | Thunderstorm Wind |
| Sep 11, 2020 | 0 hrs | 34,166 (36%) | Thunderstorm Wind |
| Sep 11, 2020 | 0 hrs | 34,166 (36%) | Thunderstorm Wind |
| Sep 15, 2020 | 1 hrs | 34,126 (36%) | Unnamed event |
| Sep 15, 2020 | 0 hrs | 34,125 (36%) | Unnamed event |
Over the 12 years from 2014 to 2025, Delaware County recorded 1,124 distinct power outage events, averaging 2.6 hours per event.
The single worst outage on record in Delaware County started September 11, 2020 (Thunderstorm Wind), lasting 0 hours and leaving up to 34,166 customers without power (36% of the county) at its peak.
July has historically been the worst month for outages in Delaware County, with 138 events recorded during that month across the dataset.
Based on this history, Delaware County earns a Reliability Grade of C, placing it in the 56th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Ohio
Counties with the closest reliability grade and national percentile to Delaware County.
| County | Grade | National percentile |
|---|---|---|
| Van Wert County | C | 56th |
| Summit County | C | 55th |
| Pickaway County | C | 57th |
| Hamilton County | C | 55th |
| Logan County | C | 57th |
FAQ
How often does power go out in Delaware County?
Between 2014 and 2025, Delaware County recorded 1,124 outage events, averaging 2.6 hours each.
What is Delaware County's reliability grade?
Delaware County has a Reliability Grade of C, in the 56th national percentile.
What was the worst power outage in Delaware County?
The worst outage on record started September 11, 2020 (Thunderstorm Wind), lasting 0 hours and affecting up to 34,166 customers.