Jefferson County Power Outage History
2014–2025 · Missouri
Average — typical outage frequency and duration nationally. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Mar 14, 2025 | 10 hrs | 29,155 (27%) | Tornado |
| Mar 15, 2025 | 47 hrs | 27,368 (25%) | Tornado |
| Jul 13, 2016 | 55 hrs | 19,529 (18%) | Thunderstorm Wind |
| Aug 10, 2020 | 49 hrs | 18,913 (17%) | Thunderstorm Wind |
| May 16, 2025 | 68 hrs | 12,931 (12%) | Thunderstorm Wind |
Over the 12 years from 2014 to 2025, Jefferson County recorded 792 distinct power outage events, averaging 3.1 hours per event.
The single worst outage on record in Jefferson County started March 14, 2025 (Tornado), lasting 10 hours and leaving up to 29,155 customers without power (27% of the county) at its peak.
July has historically been the worst month for outages in Jefferson County, with 99 events recorded during that month across the dataset.
Based on this history, Jefferson County earns a Reliability Grade of C, placing it in the 54th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Missouri
Counties with the closest reliability grade and national percentile to Jefferson County.
| County | Grade | National percentile |
|---|---|---|
| Stoddard County | C | 55th |
| Pemiscot County | C | 55th |
| Gentry County | C | 55th |
| Vernon County | C | 54th |
| Christian County | C | 53rd |
FAQ
How often does power go out in Jefferson County?
Between 2014 and 2025, Jefferson County recorded 792 outage events, averaging 3.1 hours each.
What is Jefferson County's reliability grade?
Jefferson County has a Reliability Grade of C, in the 54th national percentile.
What was the worst power outage in Jefferson County?
The worst outage on record started March 14, 2025 (Tornado), lasting 10 hours and affecting up to 29,155 customers.