Cobb CountyPower Outage History
What this grade means
Better than average — fewer or shorter outages than most counties. This county's outage history is better than the national median: recorded outages are less frequent and/or shorter in duration than a typical US county experienced over the same 12-year period. It isn't in the top tier nationally, but its track record points to lower-than-average outage risk.
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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Cobb County, Georgia that day.
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).
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 |
Most reliable counties nationally
The top 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | South Dakota | A | 100th |
| Clearwater County | Minnesota | A | 99th |
| Limestone County | Alabama | A | 99th |
Least reliable counties nationally
The bottom 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | West Virginia | F | 0th |
| Lincoln County | West Virginia | F | 0th |
| Cameron Parish | Louisiana | F | 0th |
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.