Washington County Power Outage History
2015–2025 · Tennessee
Better than average — fewer or shorter outages than most counties. How grades are calculated
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 |
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).
Sized for Washington County's outage profile
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Outage-prep kit
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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 |
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.