Sac CountyPower Outage History
2015–2025 · Iowa
Average — typical outage frequency and duration nationally.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Mar 19, 2025 | 27 hrs | 3,463 (68%) | Thunderstorm Wind |
| Dec 10, 2021 | 12 hrs | 2,274 (45%) | Unnamed event |
| Dec 15, 2021 | 8 hrs | 1,818 (36%) | Tornado |
| Jun 1, 2021 | 4 hrs | 1,573 (31%) | Unnamed event |
| Mar 16, 2018 | 2 hrs | 1,360 (27%) | Unnamed event |
Over the 11 years from 2015 to 2025, Sac County recorded 216 distinct power outage events, averaging 2.5 hours per event.
The single worst outage on record in Sac County started March 19, 2025 (Thunderstorm Wind), lasting 27 hours and leaving up to 3,463 customers without power (68% of the county) at its peak.
July has historically been the worst month for outages in Sac County, with 26 events recorded during that month across the dataset.
Based on this history, Sac County earns a Reliability Grade of C, placing it in the 58th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Iowa
Counties with the closest reliability grade and national percentile to Sac County.
| County | Grade | National percentile |
|---|---|---|
| Johnson County | C | 58th |
| Allamakee County | C | 58th |
| Webster County | C | 59th |
| Butler County | C | 59th |
| Guthrie County | C | 59th |
Most reliable counties in Iowa
The top 3 counties in Iowa by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Clay County | A | 97th |
| Emmet County | A | 95th |
| Bremer County | A | 94th |
Least reliable counties in Iowa
The bottom 3 counties in Iowa by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Marshall County | F | 6th |
| Tama County | F | 12th |
| Jasper County | F | 14th |
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 Sac County?
Between 2015 and 2025, Sac County recorded 216 outage events, averaging 2.5 hours each.
What is Sac County's reliability grade?
Sac County has a Reliability Grade of C, in the 58th national percentile.
What was the worst power outage in Sac County?
The worst outage on record started March 19, 2025 (Thunderstorm Wind), lasting 27 hours and affecting up to 3,463 customers.