Anderson 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 |
|---|---|---|---|
| Dec 7, 2024 | <1 hr | 5,817 (13%) | Unnamed event |
| Apr 15, 2022 | 1 hrs | 5,584 (13%) | Unnamed event |
| Oct 14, 2015 | <1 hr | 5,576 (13%) | Unnamed event |
| Oct 6, 2015 | <1 hr | 5,571 (13%) | Unnamed event |
| Jul 7, 2016 | 3 hrs | 5,397 (12%) | Thunderstorm Wind |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Anderson County, Tennessee that day.
Over the 12 years from 2014 to 2025, Anderson County recorded 486 distinct power outage events, averaging 1.2 hours per event.
The single worst outage on record in Anderson County started December 7, 2024, lasting less than 1 hour and leaving up to 5,817 customers without power (13% of the county) at its peak.
July has historically been the worst month for outages in Anderson County, with 55 events recorded during that month across the dataset.
Based on this history, Anderson County earns a Reliability Grade of A, placing it in the 91st percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Tennessee
Counties with the closest reliability grade and national percentile to Anderson County.
| County | Grade | National percentile |
|---|---|---|
| Smith County | A | 92nd |
| Hardeman County | A | 92nd |
| Rutherford County | A | 92nd |
| Williamson County | A | 90th |
| Hamblen County | A | 90th |
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 Anderson County?
Between 2014 and 2025, Anderson County recorded 486 outage events, averaging 1.2 hours each.
What is Anderson County's reliability grade?
Anderson County has a Reliability Grade of A, in the 91st national percentile.
What was the worst power outage in Anderson County?
The worst outage on record started December 7, 2024, lasting less than 1 hour and affecting up to 5,817 customers.