Washington CountyPower Outage History
What this grade means
Better than average — fewer or shorter outages than most counties. This county's outage history is better than the national median: recorded outages are less frequent and/or shorter in duration than a typical US county experienced over the same 12-year period. It isn't in the top tier nationally, but its track record points to lower-than-average outage risk.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Sep 27, 2024 | 116 hrs | 28,622 (33%) | Tropical Storm Helene |
| Apr 1, 2023 | 17 hrs | 15,898 (18%) | Unnamed event |
| Jan 12, 2023 | 16 hrs | 15,626 (18%) | Unnamed event |
| Aug 15, 2023 | 6 hrs | 15,616 (18%) | Thunderstorm Wind |
| Mar 25, 2023 | 12 hrs | 13,074 (15%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Washington County, Tennessee that day.
Over the 11 years from 2015 to 2025, Washington County recorded 583 distinct power outage events, averaging 2.0 hours per event.
The single worst outage on record in Washington County started September 27, 2024 (Tropical Storm Helene), lasting 116 hours and leaving up to 28,622 customers without power (33% of the county) at its peak.
May has historically been the worst month for outages in Washington County, with 70 events recorded during that month across the dataset.
Based on this history, Washington County earns a Reliability Grade of B, placing it in the 79th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Tennessee
Counties with the closest reliability grade and national percentile to Washington County.
| County | Grade | National percentile |
|---|---|---|
| Wilson County | B | 79th |
| Roane County | A | 81st |
| McMinn County | B | 78th |
| Cannon County | B | 78th |
| Van Buren County | A | 81st |
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 Washington County?
Between 2015 and 2025, Washington County recorded 583 outage events, averaging 2.0 hours each.
What is Washington County's reliability grade?
Washington County has a Reliability Grade of B, in the 79th national percentile.
What was the worst power outage in Washington County?
The worst outage on record started September 27, 2024 (Tropical Storm Helene), lasting 116 hours and affecting up to 28,622 customers.