Warren County Power Outage History
2015–2025 · Iowa
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 |
|---|---|---|---|
| Mar 5, 2022 | 33 hrs | 5,746 (22%) | Tornado |
| Sep 15, 2019 | 2 hrs | 4,911 (19%) | Thunderstorm Wind |
| Jul 30, 2022 | 2 hrs | 4,226 (16%) | Unnamed event |
| Jun 28, 2018 | 4 hrs | 3,950 (15%) | Heavy Rain |
| May 21, 2021 | 1 hrs | 3,515 (13%) | Unnamed event |
Over the 11 years from 2015 to 2025, Warren County recorded 269 distinct power outage events, averaging 2.6 hours per event.
The single worst outage on record in Warren County started March 5, 2022 (Tornado), lasting 33 hours and leaving up to 5,746 customers without power (22% of the county) at its peak.
June has historically been the worst month for outages in Warren County, with 44 events recorded during that month across the dataset.
Based on this history, Warren County earns a Reliability Grade of B, placing it in the 79th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Warren County's outage profile
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Similar counties in Iowa
Counties with the closest reliability grade and national percentile to Warren County.
| County | Grade | National percentile |
|---|---|---|
| O'Brien County | B | 79th |
| Decatur County | B | 79th |
| Crawford County | B | 79th |
| Audubon County | B | 78th |
| Hamilton County | B | 80th |
FAQ
How often does power go out in Warren County?
Between 2015 and 2025, Warren County recorded 269 outage events, averaging 2.6 hours each.
What is Warren County's reliability grade?
Warren County has a Reliability Grade of B, in the 79th national percentile.
What was the worst power outage in Warren County?
The worst outage on record started March 5, 2022 (Tornado), lasting 33 hours and affecting up to 5,746 customers.