Lyon CountyPower Outage History
2015–2025 · Iowa
Better than average — fewer or shorter outages than most counties.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jul 29, 2025 | 47 hrs | 1,792 (31%) | Excessive Heat |
| Apr 11, 2019 | 39 hrs | 1,619 (28%) | Flood |
| May 11, 2022 | 3 hrs | 1,142 (20%) | Thunderstorm Wind |
| Jun 18, 2016 | 4 hrs | 1,132 (20%) | Excessive Heat |
| May 12, 2022 | 4 hrs | 839 (15%) | Thunderstorm Wind |
Over the 11 years from 2015 to 2025, Lyon County recorded 121 distinct power outage events, averaging 2.8 hours per event.
The single worst outage on record in Lyon County started July 29, 2025 (Excessive Heat), lasting 47 hours and leaving up to 1,792 customers without power (31% of the county) at its peak.
June has historically been the worst month for outages in Lyon County, with 20 events recorded during that month across the dataset.
Based on this history, Lyon County earns a Reliability Grade of B, placing it in the 78th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Lyon County's outage profile
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Outage-prep kit
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Similar counties in Iowa
Counties with the closest reliability grade and national percentile to Lyon County.
| County | Grade | National percentile |
|---|---|---|
| Audubon County | B | 78th |
| Crawford County | B | 79th |
| Shelby County | B | 77th |
| Warren County | B | 79th |
| O'Brien County | B | 79th |
Most reliable counties in Iowa
The top 3 counties in Iowa by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Clay County | A | 97th |
| Emmet County | A | 95th |
| Bremer County | A | 94th |
Least reliable counties in Iowa
The bottom 3 counties in Iowa by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Marshall County | F | 6th |
| Tama County | F | 12th |
| Jasper County | F | 14th |
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 Lyon County?
Between 2015 and 2025, Lyon County recorded 121 outage events, averaging 2.8 hours each.
What is Lyon County's reliability grade?
Lyon County has a Reliability Grade of B, in the 78th national percentile.
What was the worst power outage in Lyon County?
The worst outage on record started July 29, 2025 (Excessive Heat), lasting 47 hours and affecting up to 1,792 customers.