Harrison CountyPower Outage History
2015–2025 · 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 | 13 hrs | 967 (24%) | Drought |
| Aug 3, 2015 | 4 hrs | 928 (23%) | Thunderstorm Wind |
| May 17, 2017 | 5 hrs | 911 (23%) | Unnamed event |
| Feb 8, 2017 | <1 hr | 911 (23%) | Unnamed event |
| Jun 16, 2017 | 11 hrs | 909 (23%) | Thunderstorm Wind |
Over the 11 years from 2015 to 2025, Harrison County recorded 126 distinct power outage events, averaging 2.5 hours per event.
The single worst outage on record in Harrison County started June 29, 2023 (Drought), lasting 13 hours and leaving up to 967 customers without power (24% of the county) at its peak.
August has historically been the worst month for outages in Harrison County, with 22 events recorded during that month across the dataset.
Based on this history, Harrison County earns a Reliability Grade of B, placing it in the 78th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Harrison 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 Harrison County.
| County | Grade | National percentile |
|---|---|---|
| Jasper County | B | 78th |
| Franklin County | B | 78th |
| Ralls County | B | 78th |
| Greene County | B | 77th |
| Clark County | B | 76th |
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 Harrison County?
Between 2015 and 2025, Harrison County recorded 126 outage events, averaging 2.5 hours each.
What is Harrison County's reliability grade?
Harrison County has a Reliability Grade of B, in the 78th national percentile.
What was the worst power outage in Harrison County?
The worst outage on record started June 29, 2023 (Drought), lasting 13 hours and affecting up to 967 customers.