Shelby County Power Outage History
2014–2025 · Tennessee
Bottom 20% least reliable nationally — frequent and/or long outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| May 28, 2017 | 114 hrs | 155,108 (37%) | Thunderstorm Wind |
| Jul 18, 2023 | 162 hrs | 138,851 (33%) | Heat |
| Feb 3, 2022 | 305 hrs | 137,794 (33%) | Ice Storm |
| Jun 25, 2023 | 305 hrs | 120,822 (29%) | Excessive Heat |
| Dec 22, 2022 | 54 hrs | 84,234 (20%) | Winter Storm Elliott |
Over the 12 years from 2014 to 2025, Shelby County recorded 6,612 distinct power outage events, averaging 3.2 hours per event.
The single worst outage on record in Shelby County started May 28, 2017 (Thunderstorm Wind), lasting 114 hours and leaving up to 155,108 customers without power (37% of the county) at its peak.
July has historically been the worst month for outages in Shelby County, with 699 events recorded during that month across the dataset.
Based on this history, Shelby County earns a Reliability Grade of F, placing it in the 8th 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 Shelby County.
| County | Grade | National percentile |
|---|---|---|
| Sevier County | D | 20th |
| Stewart County | D | 21st |
| Clay County | D | 24th |
| Pickett County | D | 26th |
| Meigs County | D | 29th |
FAQ
How often does power go out in Shelby County?
Between 2014 and 2025, Shelby County recorded 6,612 outage events, averaging 3.2 hours each.
What is Shelby County's reliability grade?
Shelby County has a Reliability Grade of F, in the 8th national percentile.
What was the worst power outage in Shelby County?
The worst outage on record started May 28, 2017 (Thunderstorm Wind), lasting 114 hours and affecting up to 155,108 customers.