Union CountyPower Outage History
What this grade means
Top 20% most reliable nationally — infrequent, short outages. This county ranks in the most reliable fifth of all US counties in our dataset, based on 12 years of real DOE outage records: outages happen less often here, and when they do occur they tend to be resolved quickly compared to the rest of the country. Baseline outage risk is low, though a severe local storm can still occasionally cause a longer-than-usual outage regardless of the long-term track record.
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 hr | 1,911 (24%) | Unnamed event |
| May 28, 2018 | 1 hrs | 1,897 (24%) | Unnamed event |
| Aug 23, 2018 | <1 hr | 1,895 (24%) | Heavy Rain |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Union County, Iowa that day.
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).
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 |
Most reliable counties nationally
The top 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | South Dakota | A | 100th |
| Clearwater County | Minnesota | A | 99th |
| Limestone County | Alabama | A | 99th |
Least reliable counties nationally
The bottom 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | West Virginia | F | 0th |
| Lincoln County | West Virginia | F | 0th |
| Cameron Parish | Louisiana | F | 0th |
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.