Hamblen CountyPower Outage History
What this grade means
Top 20% most reliable nationally — infrequent, short outages. This county ranks in the most reliable fifth of all US counties in our dataset, based on 12 years of real DOE outage records: outages happen less often here, and when they do occur they tend to be resolved quickly compared to the rest of the country. Baseline outage risk is low, though a severe local storm can still occasionally cause a longer-than-usual outage regardless of the long-term track record.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Sep 27, 2024 | 58 hrs | 8,088 (21%) | Tropical Storm Helene |
| Dec 23, 2022 | 2 hrs | 6,996 (18%) | Winter Storm Elliott |
| Dec 24, 2022 | 2 hrs | 6,416 (17%) | Winter Storm Elliott |
| Dec 24, 2022 | 3 hrs | 3,433 (9%) | Winter Storm Elliott |
| May 2, 2024 | <1 hr | 3,006 (8%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Hamblen County, Tennessee that day.
Over the 9 years from 2017 to 2025, Hamblen County recorded 277 distinct power outage events, averaging 1.8 hours per event.
The single worst outage on record in Hamblen County started September 27, 2024 (Tropical Storm Helene), lasting 58 hours and leaving up to 8,088 customers without power (21% of the county) at its peak.
May has historically been the worst month for outages in Hamblen County, with 56 events recorded during that month across the dataset.
Based on this history, Hamblen County earns a Reliability Grade of A, placing it in the 90th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Tennessee
Counties with the closest reliability grade and national percentile to Hamblen County.
| County | Grade | National percentile |
|---|---|---|
| Williamson County | A | 90th |
| Gibson County | A | 88th |
| Overton County | A | 88th |
| Hamilton County | A | 88th |
| Anderson County | A | 91st |
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 Hamblen County?
Between 2017 and 2025, Hamblen County recorded 277 outage events, averaging 1.8 hours each.
What is Hamblen County's reliability grade?
Hamblen County has a Reliability Grade of A, in the 90th national percentile.
What was the worst power outage in Hamblen County?
The worst outage on record started September 27, 2024 (Tropical Storm Helene), lasting 58 hours and affecting up to 8,088 customers.