Sullivan CountyPower Outage History
What this grade means
(How grades are calculated)Top 20% most reliable nationally — infrequent, short outages. This county ranks in the most reliable fifth of all US counties in our dataset, based on 12 years of real DOE outage records: outages happen less often here, and when they do occur they tend to be resolved quickly compared to the rest of the country. Baseline outage risk is low, though a severe local storm can still occasionally cause a longer-than-usual outage regardless of the long-term track record.
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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Sullivan County, Missouri that day.
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).
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 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.