St. Charles County Power Outage History
2014–2025 · 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 |
|---|---|---|---|
| Jun 19, 2021 | 48 hrs | 25,716 (10%) | Thunderstorm Wind |
| Jul 29, 2023 | 49 hrs | 24,562 (10%) | Excessive Heat |
| Apr 9, 2020 | 1 hrs | 22,911 (9%) | Thunderstorm Wind |
| Aug 10, 2020 | 30 hrs | 16,968 (7%) | Flash Flood |
| Apr 26, 2016 | 13 hrs | 12,665 (5%) | Thunderstorm Wind |
Over the 12 years from 2014 to 2025, St. Charles County recorded 1,055 distinct power outage events, averaging 2.2 hours per event.
The single worst outage on record in St. Charles County started June 19, 2021 (Thunderstorm Wind), lasting 48 hours and leaving up to 25,716 customers without power (10% of the county) at its peak.
July has historically been the worst month for outages in St. Charles County, with 127 events recorded during that month across the dataset.
Based on this history, St. Charles County earns a Reliability Grade of A, placing it in the 88th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for St. Charles County's outage profile
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Similar counties in Missouri
Counties with the closest reliability grade and national percentile to St. Charles County.
| County | Grade | National percentile |
|---|---|---|
| Pettis County | A | 89th |
| Polk County | A | 87th |
| Saline County | A | 89th |
| Butler County | A | 89th |
| Scott County | A | 87th |
FAQ
How often does power go out in St. Charles County?
Between 2014 and 2025, St. Charles County recorded 1,055 outage events, averaging 2.2 hours each.
What is St. Charles County's reliability grade?
St. Charles County has a Reliability Grade of A, in the 88th national percentile.
What was the worst power outage in St. Charles County?
The worst outage on record started June 19, 2021 (Thunderstorm Wind), lasting 48 hours and affecting up to 25,716 customers.