St. Clair County Power Outage History
2015–2025 · 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 |
|---|---|---|---|
| May 19, 2025 | 57 hrs | 2,667 (39%) | Thunderstorm Wind |
| Jul 31, 2023 | 27 hrs | 2,102 (31%) | Drought |
| Jun 26, 2024 | 7 hrs | 1,285 (19%) | Unnamed event |
| Jul 25, 2022 | 4 hrs | 1,070 (16%) | Drought |
| May 7, 2024 | 15 hrs | 1,034 (15%) | Thunderstorm Wind |
Over the 11 years from 2015 to 2025, St. Clair County recorded 610 distinct power outage events, averaging 2.4 hours per event.
The single worst outage on record in St. Clair County started May 19, 2025 (Thunderstorm Wind), lasting 57 hours and leaving up to 2,667 customers without power (39% of the county) at its peak.
June has historically been the worst month for outages in St. Clair County, with 71 events recorded during that month across the dataset.
Based on this history, St. Clair County earns a Reliability Grade of C, placing it in the 49th 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 St. Clair County.
| County | Grade | National percentile |
|---|---|---|
| Chariton County | C | 48th |
| Dent County | C | 50th |
| Webster County | C | 50th |
| Buchanan County | C | 51st |
| Oregon County | C | 47th |
Most reliable counties in Missouri
The top 3 counties in Missouri by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Mercer County | A | 98th |
| McDonald County | A | 97th |
| Boone County | A | 97th |
Least reliable counties in Missouri
The bottom 3 counties in Missouri by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| St. Louis County | F | 10th |
| Reynolds County | F | 20th |
| Iron County | D | 22nd |
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 St. Clair County?
Between 2015 and 2025, St. Clair County recorded 610 outage events, averaging 2.4 hours each.
What is St. Clair County's reliability grade?
St. Clair County has a Reliability Grade of C, in the 49th national percentile.
What was the worst power outage in St. Clair County?
The worst outage on record started May 19, 2025 (Thunderstorm Wind), lasting 57 hours and affecting up to 2,667 customers.