Hancock CountyPower Outage History
2014–2025 · 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 |
|---|---|---|---|
| Jul 29, 2025 | 35 hrs | 5,271 (93%) | Thunderstorm Wind |
| Mar 5, 2025 | 30 hrs | 4,226 (75%) | High Wind |
| Apr 11, 2019 | 85 hrs | 3,720 (66%) | Hail |
| Nov 27, 2019 | 8 hrs | 3,706 (65%) | Winter Storm |
| Apr 18, 2023 | 2 hrs | 3,371 (60%) | Unnamed event |
Over the 12 years from 2014 to 2025, Hancock County recorded 279 distinct power outage events, averaging 2.7 hours per event.
The single worst outage on record in Hancock County started July 29, 2025 (Thunderstorm Wind), lasting 35 hours and leaving up to 5,271 customers without power (93% of the county) at its peak.
July has historically been the worst month for outages in Hancock County, with 35 events recorded during that month across the dataset.
Based on this history, Hancock County earns a Reliability Grade of C, placing it in the 48th 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 Hancock County.
| County | Grade | National percentile |
|---|---|---|
| Appanoose County | C | 48th |
| Washington County | C | 47th |
| Mills County | C | 49th |
| Calhoun County | C | 47th |
| Scott County | C | 50th |
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 Hancock County?
Between 2014 and 2025, Hancock County recorded 279 outage events, averaging 2.7 hours each.
What is Hancock County's reliability grade?
Hancock County has a Reliability Grade of C, in the 48th national percentile.
What was the worst power outage in Hancock County?
The worst outage on record started July 29, 2025 (Thunderstorm Wind), lasting 35 hours and affecting up to 5,271 customers.