Dallas County Power Outage History
2017–2025 · Missouri
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 |
|---|---|---|---|
| Apr 2, 2024 | 20 hrs | 4,000 (32%) | Thunderstorm Wind |
| Apr 5, 2025 | 3 hrs | 2,890 (23%) | Flash Flood |
| May 4, 2020 | 4 hrs | 2,466 (20%) | Thunderstorm Wind |
| Aug 29, 2023 | 2 hrs | 2,153 (17%) | Drought |
| Jan 1, 2021 | 8 hrs | 1,882 (15%) | Winter Storm |
Over the 9 years from 2017 to 2025, Dallas County recorded 558 distinct power outage events, averaging 2.2 hours per event.
The single worst outage on record in Dallas County started April 2, 2024 (Thunderstorm Wind), lasting 20 hours and leaving up to 4,000 customers without power (32% of the county) at its peak.
May has historically been the worst month for outages in Dallas County, with 74 events recorded during that month across the dataset.
Based on this history, Dallas County earns a Reliability Grade of A, placing it in the 84th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Dallas County's outage profile
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Similar counties in Missouri
Counties with the closest reliability grade and national percentile to Dallas County.
| County | Grade | National percentile |
|---|---|---|
| Morgan County | A | 84th |
| Knox County | A | 84th |
| Johnson County | A | 84th |
| Monroe County | A | 85th |
| Phelps County | A | 85th |
FAQ
How often does power go out in Dallas County?
Between 2017 and 2025, Dallas County recorded 558 outage events, averaging 2.2 hours each.
What is Dallas County's reliability grade?
Dallas County has a Reliability Grade of A, in the 84th national percentile.
What was the worst power outage in Dallas County?
The worst outage on record started April 2, 2024 (Thunderstorm Wind), lasting 20 hours and affecting up to 4,000 customers.