Dearborn CountyPower Outage History
What this grade means
Better than average — fewer or shorter outages than most counties. This county's outage history is better than the national median: recorded outages are less frequent and/or shorter in duration than a typical US county experienced over the same 12-year period. It isn't in the top tier nationally, but its track record points to lower-than-average outage risk.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jul 5, 2020 | 13 hrs | 5,572 (26%) | Unnamed event |
| Jun 19, 2021 | 40 hrs | 5,347 (25%) | Thunderstorm Wind |
| May 5, 2021 | 4 hrs | 4,967 (23%) | Unnamed event |
| Jul 12, 2025 | 13 hrs | 4,641 (21%) | Thunderstorm Wind |
| Nov 15, 2018 | 43 hrs | 3,955 (18%) | Ice Storm |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Dearborn County, Indiana that day.
Over the 12 years from 2014 to 2025, Dearborn County recorded 426 distinct power outage events, averaging 2.6 hours per event.
The single worst outage on record in Dearborn County started July 5, 2020, lasting 13 hours and leaving up to 5,572 customers without power (26% of the county) at its peak.
July has historically been the worst month for outages in Dearborn County, with 65 events recorded during that month across the dataset.
Based on this history, Dearborn County earns a Reliability Grade of B, placing it in the 61st percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Indiana
Counties with the closest reliability grade and national percentile to Dearborn County.
| County | Grade | National percentile |
|---|---|---|
| Greene County | B | 61st |
| Allen County | B | 60th |
| Rush County | B | 60th |
| Union County | C | 60th |
| White County | B | 62nd |
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 Dearborn County?
Between 2014 and 2025, Dearborn County recorded 426 outage events, averaging 2.6 hours each.
What is Dearborn County's reliability grade?
Dearborn County has a Reliability Grade of B, in the 61st national percentile.
What was the worst power outage in Dearborn County?
The worst outage on record started July 5, 2020, lasting 13 hours and affecting up to 5,572 customers.