Clark CountyPower Outage History
2014–2025 · Missouri
Better than average — fewer or shorter outages than most counties.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jun 29, 2023 | 40 hrs | 2,619 (46%) | Thunderstorm Wind |
| Nov 15, 2021 | 2 hrs | 2,319 (41%) | Unnamed event |
| Mar 22, 2025 | 2 hrs | 1,330 (23%) | Unnamed event |
| May 27, 2024 | 7 hrs | 1,159 (20%) | Hail |
| Jan 9, 2024 | 17 hrs | 1,024 (18%) | Blizzard |
Over the 12 years from 2014 to 2025, Clark County recorded 219 distinct power outage events, averaging 2.1 hours per event.
The single worst outage on record in Clark County started June 29, 2023 (Thunderstorm Wind), lasting 40 hours and leaving up to 2,619 customers without power (46% of the county) at its peak.
July has historically been the worst month for outages in Clark County, with 34 events recorded during that month across the dataset.
Based on this history, Clark County earns a Reliability Grade of B, placing it in the 76th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Clark County's outage profile
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Outage-prep kit
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Similar counties in Missouri
Counties with the closest reliability grade and national percentile to Clark County.
| County | Grade | National percentile |
|---|---|---|
| Daviess County | B | 76th |
| Greene County | B | 77th |
| Dade County | B | 74th |
| Cape Girardeau County | B | 74th |
| Scotland County | B | 74th |
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 Clark County?
Between 2014 and 2025, Clark County recorded 219 outage events, averaging 2.1 hours each.
What is Clark County's reliability grade?
Clark County has a Reliability Grade of B, in the 76th national percentile.
What was the worst power outage in Clark County?
The worst outage on record started June 29, 2023 (Thunderstorm Wind), lasting 40 hours and affecting up to 2,619 customers.