Dallas County Power Outage History
2014–2025 · 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 |
|---|---|---|---|
| Aug 10, 2020 | 213 hrs | 19,149 (33%) | Drought |
| Aug 17, 2015 | 3 hrs | 7,066 (12%) | Unnamed event |
| Jul 23, 2022 | 6 hrs | 6,523 (11%) | Unnamed event |
| Sep 23, 2025 | 1 hrs | 6,037 (10%) | Unnamed event |
| Mar 5, 2025 | 21 hrs | 5,911 (10%) | High Wind |
Over the 12 years from 2014 to 2025, Dallas County recorded 273 distinct power outage events, averaging 2.5 hours per event.
The single worst outage on record in Dallas County started August 10, 2020 (Drought), lasting 213 hours and leaving up to 19,149 customers without power (33% of the county) at its peak.
July has historically been the worst month for outages in Dallas County, with 44 events recorded during that month across the dataset.
Based on this history, Dallas County earns a Reliability Grade of B, placing it in the 76th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Dallas 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 Dallas County.
| County | Grade | National percentile |
|---|---|---|
| Page County | B | 77th |
| Shelby County | B | 77th |
| Floyd County | B | 75th |
| Humboldt County | B | 75th |
| Lyon County | B | 78th |
FAQ
How often does power go out in Dallas County?
Between 2014 and 2025, Dallas County recorded 273 outage events, averaging 2.5 hours each.
What is Dallas County's reliability grade?
Dallas County has a Reliability Grade of B, in the 76th national percentile.
What was the worst power outage in Dallas County?
The worst outage on record started August 10, 2020 (Drought), lasting 213 hours and affecting up to 19,149 customers.