Union 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 |
|---|---|---|---|
| May 24, 2019 | 2 hrs | 5,453 (68%) | Unnamed event |
| Jun 8, 2022 | 11 hrs | 3,046 (38%) | Thunderstorm Wind |
| Oct 22, 2024 | 1 hrs | 1,911 (24%) | Unnamed event |
| May 28, 2018 | 1 hrs | 1,897 (24%) | Unnamed event |
| Aug 23, 2018 | 0 hrs | 1,895 (24%) | Heavy Rain |
Over the 12 years from 2014 to 2025, Union County recorded 467 distinct power outage events, averaging 1.4 hours per event.
The single worst outage on record in Union County started May 24, 2019, lasting 2 hours and leaving up to 5,453 customers without power (68% of the county) at its peak.
June has historically been the worst month for outages in Union County, with 67 events recorded during that month across the dataset.
Based on this history, Union County earns a Reliability Grade of A, placing it in the 87th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Union County's outage profile
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Similar counties in Iowa
Counties with the closest reliability grade and national percentile to Union County.
| County | Grade | National percentile |
|---|---|---|
| Cherokee County | A | 87th |
| Jackson County | A | 87th |
| Buena Vista County | A | 87th |
| Plymouth County | A | 88th |
| Osceola County | A | 88th |
FAQ
How often does power go out in Union County?
Between 2014 and 2025, Union County recorded 467 outage events, averaging 1.4 hours each.
What is Union County's reliability grade?
Union County has a Reliability Grade of A, in the 87th national percentile.
What was the worst power outage in Union County?
The worst outage on record started May 24, 2019, lasting 2 hours and affecting up to 5,453 customers.