Johnson CountyPower Outage History
What this grade means
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 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 hr | 7,089 (11%) | Thunderstorm Wind |
| Jun 29, 2023 | 48 hrs | 5,949 (9%) | Tornado |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Johnson County, Indiana that day.
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).
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 |
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 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.