Hamilton County Power Outage History
2019–2025 · Tennessee
Top 20% most reliable nationally — infrequent, short outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jun 13, 2025 | 1 hrs | 114,753 (60%) | Thunderstorm Wind |
| May 21, 2024 | 1 hrs | 62,351 (32%) | Unnamed event |
| Jul 8, 2024 | 1 hrs | 37,858 (20%) | Unnamed event |
| Nov 13, 2023 | 1 hrs | 35,366 (18%) | Unnamed event |
| Jun 13, 2025 | 1 hrs | 26,004 (13%) | Thunderstorm Wind |
Over the 7 years from 2019 to 2025, Hamilton County recorded 981 distinct power outage events, averaging 1.9 hours per event.
The single worst outage on record in Hamilton County started June 13, 2025 (Thunderstorm Wind), lasting 1 hours and leaving up to 114,753 customers without power (60% of the county) at its peak.
July has historically been the worst month for outages in Hamilton County, with 136 events recorded during that month across the dataset.
Based on this history, Hamilton County earns a Reliability Grade of A, placing it in the 88th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Hamilton County's outage profile
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Outage-prep kit
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Similar counties in Tennessee
Counties with the closest reliability grade and national percentile to Hamilton County.
| County | Grade | National percentile |
|---|---|---|
| Overton County | A | 88th |
| Gibson County | A | 88th |
| Hamblen County | A | 90th |
| Williamson County | A | 90th |
| Anderson County | A | 91st |
FAQ
How often does power go out in Hamilton County?
Between 2019 and 2025, Hamilton County recorded 981 outage events, averaging 1.9 hours each.
What is Hamilton County's reliability grade?
Hamilton County has a Reliability Grade of A, in the 88th national percentile.
What was the worst power outage in Hamilton County?
The worst outage on record started June 13, 2025 (Thunderstorm Wind), lasting 1 hours and affecting up to 114,753 customers.