Carroll County Power Outage History
2014–2025 · Iowa
Top 20% most reliable nationally — infrequent, short outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jul 11, 2022 | 6 hrs | 3,405 (26%) | Tornado |
| Jul 6, 2016 | 15 hrs | 3,253 (25%) | Heavy Rain |
| Apr 15, 2018 | 1 hrs | 3,098 (24%) | Unnamed event |
| Mar 19, 2025 | 28 hrs | 3,079 (24%) | Thunderstorm Wind |
| Jan 8, 2022 | 2 hrs | 2,084 (16%) | Unnamed event |
Over the 12 years from 2014 to 2025, Carroll County recorded 206 distinct power outage events, averaging 2.4 hours per event.
The single worst outage on record in Carroll County started July 11, 2022 (Tornado), lasting 6 hours and leaving up to 3,405 customers without power (26% of the county) at its peak.
August has historically been the worst month for outages in Carroll County, with 25 events recorded during that month across the dataset.
Based on this history, Carroll County earns a Reliability Grade of A, placing it in the 88th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Carroll County's outage profile
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Similar counties in Iowa
Counties with the closest reliability grade and national percentile to Carroll County.
| County | Grade | National percentile |
|---|---|---|
| Black Hawk County | A | 88th |
| Osceola County | A | 88th |
| Plymouth County | A | 88th |
| Marion County | A | 89th |
| Cass County | A | 89th |
FAQ
How often does power go out in Carroll County?
Between 2014 and 2025, Carroll County recorded 206 outage events, averaging 2.4 hours each.
What is Carroll County's reliability grade?
Carroll County has a Reliability Grade of A, in the 88th national percentile.
What was the worst power outage in Carroll County?
The worst outage on record started July 11, 2022 (Tornado), lasting 6 hours and affecting up to 3,405 customers.