Sullivan County Power Outage History
2014–2025 · Indiana
Average — typical outage frequency and duration nationally. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Apr 1, 2023 | 67 hrs | 5,013 (48%) | Tornado |
| Dec 23, 2015 | 4 hrs | 2,777 (26%) | Unnamed event |
| Jun 29, 2023 | 2 hrs | 2,763 (26%) | Hail |
| Jun 30, 2023 | 55 hrs | 2,447 (23%) | Hail |
| Apr 9, 2020 | 41 hrs | 2,096 (20%) | Thunderstorm Wind |
Over the 12 years from 2014 to 2025, Sullivan County recorded 366 distinct power outage events, averaging 3.5 hours per event.
The single worst outage on record in Sullivan County started April 1, 2023 (Tornado), lasting 67 hours and leaving up to 5,013 customers without power (48% of the county) at its peak.
June has historically been the worst month for outages in Sullivan County, with 53 events recorded during that month across the dataset.
Based on this history, Sullivan County earns a Reliability Grade of C, placing it in the 53rd percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Indiana
Counties with the closest reliability grade and national percentile to Sullivan County.
| County | Grade | National percentile |
|---|---|---|
| Franklin County | C | 53rd |
| Vanderburgh County | C | 53rd |
| Marion County | C | 53rd |
| Lake County | C | 52nd |
| Blackford County | C | 52nd |
FAQ
How often does power go out in Sullivan County?
Between 2014 and 2025, Sullivan County recorded 366 outage events, averaging 3.5 hours each.
What is Sullivan County's reliability grade?
Sullivan County has a Reliability Grade of C, in the 53rd national percentile.
What was the worst power outage in Sullivan County?
The worst outage on record started April 1, 2023 (Tornado), lasting 67 hours and affecting up to 5,013 customers.