Hamilton 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 27, 2024 | 14 hrs | 70,272 (16%) | Hurricane Helene |
| Nov 15, 2018 | 82 hrs | 66,555 (15%) | Ice Storm |
| Jun 13, 2022 | 55 hrs | 57,698 (13%) | Thunderstorm Wind |
| Jul 6, 2022 | 44 hrs | 57,136 (13%) | Thunderstorm Wind |
| Aug 11, 2017 | 1 hrs | 47,938 (11%) | Unnamed event |
Over the 12 years from 2014 to 2025, Hamilton County recorded 4,113 distinct power outage events, averaging 2.3 hours per event.
The single worst outage on record in Hamilton County started September 27, 2024 (Hurricane Helene), lasting 14 hours and leaving up to 70,272 customers without power (16% of the county) at its peak.
June has historically been the worst month for outages in Hamilton County, with 454 events recorded during that month across the dataset.
Based on this history, Hamilton County earns a Reliability Grade of C, placing it in the 55th 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 Hamilton County.
| County | Grade | National percentile |
|---|---|---|
| Muskingum County | C | 54th |
| Summit County | C | 55th |
| Van Wert County | C | 56th |
| Delaware County | C | 56th |
| Franklin County | C | 53rd |
FAQ
How often does power go out in Hamilton County?
Between 2014 and 2025, Hamilton County recorded 4,113 outage events, averaging 2.3 hours each.
What is Hamilton County's reliability grade?
Hamilton County has a Reliability Grade of C, in the 55th national percentile.
What was the worst power outage in Hamilton County?
The worst outage on record started September 27, 2024 (Hurricane Helene), lasting 14 hours and affecting up to 70,272 customers.