Marshall County Power Outage History
2014–2025 · Iowa
Bottom 20% least reliable nationally — frequent and/or long outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Aug 10, 2020 | 213 hrs | 16,662 (95%) | Thunderstorm Wind |
| Feb 19, 2016 | 1 hrs | 11,052 (63%) | High Wind |
| Jul 19, 2018 | 78 hrs | 8,657 (50%) | Tornado |
| Nov 1, 2017 | 7 hrs | 7,750 (44%) | Frost/Freeze |
| Nov 6, 2017 | 1 hrs | 7,442 (43%) | Unnamed event |
Over the 12 years from 2014 to 2025, Marshall County recorded 450 distinct power outage events, averaging 3.7 hours per event.
The single worst outage on record in Marshall County started August 10, 2020 (Thunderstorm Wind), lasting 213 hours and leaving up to 16,662 customers without power (95% of the county) at its peak.
June has historically been the worst month for outages in Marshall County, with 52 events recorded during that month across the dataset.
Based on this history, Marshall County earns a Reliability Grade of F, placing it in the 6th 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 Marshall County.
| County | Grade | National percentile |
|---|---|---|
| Tama County | F | 12th |
| Jasper County | F | 14th |
| Poweshiek County | F | 15th |
| Linn County | F | 16th |
| Benton County | F | 18th |
FAQ
How often does power go out in Marshall County?
Between 2014 and 2025, Marshall County recorded 450 outage events, averaging 3.7 hours each.
What is Marshall County's reliability grade?
Marshall County has a Reliability Grade of F, in the 6th national percentile.
What was the worst power outage in Marshall County?
The worst outage on record started August 10, 2020 (Thunderstorm Wind), lasting 213 hours and affecting up to 16,662 customers.