Union County Power Outage History
2015–2025 · Tennessee
Worse than average — more frequent or longer 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 |
|---|---|---|---|
| Mar 13, 2020 | 0 hrs | 8,591 (72%) | Unnamed event |
| May 14, 2019 | 1 hrs | 8,582 (72%) | Unnamed event |
| May 14, 2019 | 0 hrs | 8,582 (72%) | Unnamed event |
| Jul 21, 2018 | 4 hrs | 8,546 (72%) | Thunderstorm Wind |
| Jul 31, 2016 | 7 hrs | 7,509 (63%) | Unnamed event |
Over the 11 years from 2015 to 2025, Union County recorded 1,158 distinct power outage events, averaging 2.5 hours per event.
The single worst outage on record in Union County started March 13, 2020, lasting 0 hours and leaving up to 8,591 customers without power (72% of the county) at its peak.
July has historically been the worst month for outages in Union County, with 145 events recorded during that month across the dataset.
Based on this history, Union County earns a Reliability Grade of D, placing it in the 32nd percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Tennessee
Counties with the closest reliability grade and national percentile to Union County.
| County | Grade | National percentile |
|---|---|---|
| Giles County | D | 33rd |
| Polk County | D | 33rd |
| Fentress County | D | 33rd |
| Macon County | D | 31st |
| Tipton County | D | 30th |
FAQ
How often does power go out in Union County?
Between 2015 and 2025, Union County recorded 1,158 outage events, averaging 2.5 hours each.
What is Union County's reliability grade?
Union County has a Reliability Grade of D, in the 32nd national percentile.
What was the worst power outage in Union County?
The worst outage on record started March 13, 2020, lasting 0 hours and affecting up to 8,591 customers.