Grainger CountyPower Outage History
What this grade means
Average — typical outage frequency and duration nationally. This county sits in the middle of the national distribution — its outage frequency and duration over the past 12 years are close to the nationwide median, neither notably better nor worse than most other US counties. A typical amount of backup-power preparedness is reasonable here.
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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Grainger County, Tennessee that day.
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).
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 |
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 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.