Johnson County Power Outage History
2014–2025 · Indiana
Top 20% most reliable nationally — infrequent, short outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| May 27, 2024 | 2 hrs | 12,646 (20%) | Unnamed event |
| Apr 1, 2023 | 64 hrs | 7,559 (12%) | Tornado |
| Jun 28, 2022 | 6 hrs | 7,523 (12%) | Unnamed event |
| Jun 27, 2019 | 1 hrs | 7,089 (11%) | Thunderstorm Wind |
| Jun 29, 2023 | 48 hrs | 5,949 (9%) | Tornado |
Over the 12 years from 2014 to 2025, Johnson County recorded 342 distinct power outage events, averaging 2.6 hours per event.
The single worst outage on record in Johnson County started May 27, 2024, lasting 2 hours and leaving up to 12,646 customers without power (20% of the county) at its peak.
June has historically been the worst month for outages in Johnson County, with 52 events recorded during that month across the dataset.
Based on this history, Johnson County earns a Reliability Grade of A, placing it in the 81st percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Johnson County's outage profile
See more picks in our Best Small Power Stations (Under 1,000Wh) roundup.
Outage-prep kit
See our outage-prep guides.
Similar counties in Indiana
Counties with the closest reliability grade and national percentile to Johnson County.
| County | Grade | National percentile |
|---|---|---|
| Henry County | A | 81st |
| Noble County | A | 82nd |
| Ohio County | A | 80th |
| Clinton County | A | 80th |
| Shelby County | A | 82nd |
FAQ
How often does power go out in Johnson County?
Between 2014 and 2025, Johnson County recorded 342 outage events, averaging 2.6 hours each.
What is Johnson County's reliability grade?
Johnson County has a Reliability Grade of A, in the 81st national percentile.
What was the worst power outage in Johnson County?
The worst outage on record started May 27, 2024, lasting 2 hours and affecting up to 12,646 customers.