Harrison 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 | 31 hrs | 4,801 (53%) | Thunderstorm Wind |
| Feb 7, 2024 | 0 hrs | 2,454 (27%) | Unnamed event |
| Mar 17, 2024 | 3 hrs | 2,453 (27%) | Unnamed event |
| Jul 21, 2016 | 2 hrs | 2,426 (27%) | Unnamed event |
| Jul 21, 2016 | 1 hrs | 2,426 (27%) | Unnamed event |
Over the 11 years from 2015 to 2025, Harrison County recorded 222 distinct power outage events, averaging 3.2 hours per event.
The single worst outage on record in Harrison County started March 19, 2025 (Thunderstorm Wind), lasting 31 hours and leaving up to 4,801 customers without power (53% of the county) at its peak.
July has historically been the worst month for outages in Harrison County, with 37 events recorded during that month across the dataset.
Based on this history, Harrison County earns a Reliability Grade of B, placing it in the 61st percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Harrison County's outage profile
See more picks in our Best Small Power Stations (Under 1,000Wh) roundup.
Outage-prep kit
See our outage-prep guides.
Similar counties in Iowa
Counties with the closest reliability grade and national percentile to Harrison County.
| County | Grade | National percentile |
|---|---|---|
| Lee County | B | 61st |
| Franklin County | B | 61st |
| Fayette County | B | 61st |
| Polk County | B | 60th |
| Ida County | B | 62nd |
FAQ
How often does power go out in Harrison County?
Between 2015 and 2025, Harrison County recorded 222 outage events, averaging 3.2 hours each.
What is Harrison County's reliability grade?
Harrison County has a Reliability Grade of B, in the 61st national percentile.
What was the worst power outage in Harrison County?
The worst outage on record started March 19, 2025 (Thunderstorm Wind), lasting 31 hours and affecting up to 4,801 customers.