Cumberland 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 |
|---|---|---|---|
| Oct 26, 2019 | 5 hrs | 26,263 (45%) | Drought |
| May 23, 2024 | <1 hr | 19,122 (33%) | Thunderstorm Wind |
| May 27, 2024 | 4 hrs | 19,101 (33%) | Thunderstorm Wind |
| Mar 16, 2025 | 26 hrs | 14,944 (26%) | Drought |
| Oct 26, 2019 | <1 hr | 12,709 (22%) | Drought |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Cumberland County, Tennessee that day.
Over the 7 years from 2019 to 2025, Cumberland County recorded 757 distinct power outage events, averaging 1.9 hours per event.
The single worst outage on record in Cumberland County started October 26, 2019 (Drought), lasting 5 hours and leaving up to 26,263 customers without power (45% of the county) at its peak.
July has historically been the worst month for outages in Cumberland County, with 116 events recorded during that month across the dataset.
Based on this history, Cumberland County earns a Reliability Grade of C, placing it in the 52nd percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Tennessee
Counties with the closest reliability grade and national percentile to Cumberland County.
| County | Grade | National percentile |
|---|---|---|
| Knox County | C | 52nd |
| Blount County | C | 52nd |
| Trousdale County | C | 52nd |
| Robertson County | C | 53rd |
| Grainger County | C | 49th |
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 Cumberland County?
Between 2019 and 2025, Cumberland County recorded 757 outage events, averaging 1.9 hours each.
What is Cumberland County's reliability grade?
Cumberland County has a Reliability Grade of C, in the 52nd national percentile.
What was the worst power outage in Cumberland County?
The worst outage on record started October 26, 2019 (Drought), lasting 5 hours and affecting up to 26,263 customers.