Sullivan CountyPower Outage History
2015–2025 · Missouri
Top 20% most reliable nationally — infrequent, short outages.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| May 19, 2025 | 8 hrs | 641 (15%) | Unnamed event |
| Aug 8, 2015 | 1 hrs | 641 (15%) | Thunderstorm Wind |
| Jul 13, 2015 | 5 hrs | 641 (15%) | Hail |
| May 10, 2016 | 3 hrs | 628 (15%) | Unnamed event |
| Jul 13, 2016 | <1 hr | 628 (15%) | Unnamed event |
Over the 11 years from 2015 to 2025, Sullivan County recorded 100 distinct power outage events, averaging 2.5 hours per event.
The single worst outage on record in Sullivan County started May 19, 2025, lasting 8 hours and leaving up to 641 customers without power (15% of the county) at its peak.
June has historically been the worst month for outages in Sullivan County, with 21 events recorded during that month across the dataset.
Based on this history, Sullivan County earns a Reliability Grade of A, placing it in the 93rd percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Sullivan 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 Sullivan County.
| County | Grade | National percentile |
|---|---|---|
| Linn County | A | 93rd |
| Cole County | A | 93rd |
| Cedar County | A | 93rd |
| Moniteau County | A | 92nd |
| Dunklin County | A | 94th |
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 Sullivan County?
Between 2015 and 2025, Sullivan County recorded 100 outage events, averaging 2.5 hours each.
What is Sullivan County's reliability grade?
Sullivan County has a Reliability Grade of A, in the 93rd national percentile.
What was the worst power outage in Sullivan County?
The worst outage on record started May 19, 2025, lasting 8 hours and affecting up to 641 customers.