Cobb County Power Outage History
2014–2025 · Georgia
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 |
|---|---|---|---|
| Dec 8, 2017 | 100 hrs | 67,177 (20%) | Winter Storm |
| Oct 29, 2020 | 86 hrs | 65,007 (19%) | Tropical Storm Zeta |
| Jun 7, 2025 | 27 hrs | 38,496 (11%) | Thunderstorm Wind |
| Jun 25, 2023 | 24 hrs | 22,843 (7%) | Thunderstorm Wind |
| Feb 16, 2025 | 19 hrs | 22,023 (6%) | Unnamed event |
Over the 12 years from 2014 to 2025, Cobb County recorded 2,307 distinct power outage events, averaging 2.0 hours per event.
The single worst outage on record in Cobb County started December 8, 2017 (Winter Storm), lasting 100 hours and leaving up to 67,177 customers without power (20% of the county) at its peak.
July has historically been the worst month for outages in Cobb County, with 268 events recorded during that month across the dataset.
Based on this history, Cobb County earns a Reliability Grade of B, placing it in the 72nd percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Cobb County's outage profile
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Outage-prep kit
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Similar counties in Georgia
Counties with the closest reliability grade and national percentile to Cobb County.
| County | Grade | National percentile |
|---|---|---|
| Douglas County | B | 71st |
| Paulding County | B | 73rd |
| Walker County | B | 73rd |
| Spalding County | B | 73rd |
| Upson County | B | 71st |
FAQ
How often does power go out in Cobb County?
Between 2014 and 2025, Cobb County recorded 2,307 outage events, averaging 2.0 hours each.
What is Cobb County's reliability grade?
Cobb County has a Reliability Grade of B, in the 72nd national percentile.
What was the worst power outage in Cobb County?
The worst outage on record started December 8, 2017 (Winter Storm), lasting 100 hours and affecting up to 67,177 customers.