Grundy CountyPower Outage History
What this grade means
Worse than average — more frequent or longer outages than most counties. This county's recorded history shows more frequent outages and/or longer restoration times than most US counties over the same 12-year period. If you live here, it's worth taking backup power more seriously than an average household would.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Nov 5, 2025 | 111 hrs | 3,989 (45%) | Unnamed event |
| Apr 28, 2025 | 6 hrs | 3,703 (42%) | Unnamed event |
| May 9, 2024 | 21 hrs | 3,651 (41%) | Thunderstorm Wind |
| Apr 6, 2025 | 33 hrs | 3,641 (41%) | Thunderstorm Wind |
| Mar 8, 2024 | 6 hrs | 3,638 (41%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Grundy County, Tennessee that day.
Over the 6 years from 2020 to 2025, Grundy County recorded 287 distinct power outage events, averaging 4.2 hours per event.
The single worst outage on record in Grundy County started November 5, 2025, lasting 111 hours and leaving up to 3,989 customers without power (45% of the county) at its peak.
June has historically been the worst month for outages in Grundy County, with 37 events recorded during that month across the dataset.
Based on this history, Grundy County earns a Reliability Grade of D, placing it in the 37th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Tennessee
Counties with the closest reliability grade and national percentile to Grundy County.
| County | Grade | National percentile |
|---|---|---|
| Hancock County | D | 36th |
| Fayette County | D | 36th |
| Davidson County | D | 35th |
| Moore County | D | 39th |
| Fentress County | D | 33rd |
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 Grundy County?
Between 2020 and 2025, Grundy County recorded 287 outage events, averaging 4.2 hours each.
What is Grundy County's reliability grade?
Grundy County has a Reliability Grade of D, in the 37th national percentile.
What was the worst power outage in Grundy County?
The worst outage on record started November 5, 2025, lasting 111 hours and affecting up to 3,989 customers.