Shelby County Power Outage History
2017–2025 · Alabama
Average — typical outage frequency and duration nationally. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Oct 29, 2020 | 111 hrs | 59,216 (53%) | Tropical Storm |
| May 27, 2024 | 39 hrs | 39,965 (36%) | Unnamed event |
| Dec 8, 2017 | 38 hrs | 21,210 (19%) | Winter Storm |
| Jun 28, 2018 | 27 hrs | 17,930 (16%) | Unnamed event |
| Mar 25, 2021 | 57 hrs | 16,621 (15%) | Unnamed event |
Over the 9 years from 2017 to 2025, Shelby County recorded 1,351 distinct power outage events, averaging 2.5 hours per event.
The single worst outage on record in Shelby County started October 29, 2020 (Tropical Storm), lasting 111 hours and leaving up to 59,216 customers without power (53% of the county) at its peak.
July has historically been the worst month for outages in Shelby County, with 153 events recorded during that month across the dataset.
Based on this history, Shelby County earns a Reliability Grade of C, placing it in the 44th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Alabama
Counties with the closest reliability grade and national percentile to Shelby County.
| County | Grade | National percentile |
|---|---|---|
| Henry County | C | 44th |
| St. Clair County | C | 44th |
| Hale County | C | 46th |
| Blount County | C | 41st |
| Cullman County | C | 49th |
FAQ
How often does power go out in Shelby County?
Between 2017 and 2025, Shelby County recorded 1,351 outage events, averaging 2.5 hours each.
What is Shelby County's reliability grade?
Shelby County has a Reliability Grade of C, in the 44th national percentile.
What was the worst power outage in Shelby County?
The worst outage on record started October 29, 2020 (Tropical Storm), lasting 111 hours and affecting up to 59,216 customers.