Grainger County Power Outage History
2015–2025 · Tennessee
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 | 86 hrs | 5,826 (42%) | Tropical Storm Helene |
| Dec 23, 2022 | 2 hrs | 4,225 (31%) | Winter Storm Elliott |
| May 2, 2024 | 2 hrs | 3,908 (28%) | Unnamed event |
| Dec 24, 2022 | 2 hrs | 2,781 (20%) | Winter Storm Elliott |
| May 8, 2024 | 5 hrs | 2,741 (20%) | Hail |
Over the 11 years from 2015 to 2025, Grainger County recorded 626 distinct power outage events, averaging 2.7 hours per event.
The single worst outage on record in Grainger County started September 27, 2024 (Tropical Storm Helene), lasting 86 hours and leaving up to 5,826 customers without power (42% of the county) at its peak.
June has historically been the worst month for outages in Grainger County, with 70 events recorded during that month across the dataset.
Based on this history, Grainger County earns a Reliability Grade of C, placing it in the 49th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Grainger County's outage profile
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Similar counties in Tennessee
Counties with the closest reliability grade and national percentile to Grainger County.
| County | Grade | National percentile |
|---|---|---|
| Bradley County | C | 47th |
| Cheatham County | C | 46th |
| Cumberland County | C | 52nd |
| Knox County | C | 52nd |
| Blount County | C | 52nd |
FAQ
How often does power go out in Grainger County?
Between 2015 and 2025, Grainger County recorded 626 outage events, averaging 2.7 hours each.
What is Grainger County's reliability grade?
Grainger County has a Reliability Grade of C, in the 49th national percentile.
What was the worst power outage in Grainger County?
The worst outage on record started September 27, 2024 (Tropical Storm Helene), lasting 86 hours and affecting up to 5,826 customers.