Monona 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 19, 2025 | 33 hrs | 2,429 (33%) | Thunderstorm Wind |
| May 13, 2022 | 12 hrs | 1,422 (19%) | Thunderstorm Wind |
| Apr 6, 2025 | 1 hrs | 1,215 (16%) | Unnamed event |
| Mar 20, 2025 | 70 hrs | 1,031 (14%) | Thunderstorm Wind |
| Sep 23, 2025 | 3 hrs | 992 (13%) | Unnamed event |
Over the 11 years from 2015 to 2025, Monona County recorded 163 distinct power outage events, averaging 3.4 hours per event.
The single worst outage on record in Monona County started March 19, 2025 (Thunderstorm Wind), lasting 33 hours and leaving up to 2,429 customers without power (33% of the county) at its peak.
July has historically been the worst month for outages in Monona County, with 28 events recorded during that month across the dataset.
Based on this history, Monona County earns a Reliability Grade of B, placing it in the 74th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Monona County's outage profile
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Similar counties in Iowa
Counties with the closest reliability grade and national percentile to Monona County.
| County | Grade | National percentile |
|---|---|---|
| Taylor County | B | 74th |
| Montgomery County | B | 74th |
| Humboldt County | B | 75th |
| Floyd County | B | 75th |
| Delaware County | B | 72nd |
FAQ
How often does power go out in Monona County?
Between 2015 and 2025, Monona County recorded 163 outage events, averaging 3.4 hours each.
What is Monona County's reliability grade?
Monona County has a Reliability Grade of B, in the 74th national percentile.
What was the worst power outage in Monona County?
The worst outage on record started March 19, 2025 (Thunderstorm Wind), lasting 33 hours and affecting up to 2,429 customers.