Johnson County Power Outage History
2014–2025 · Texas
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 |
|---|---|---|---|
| Feb 15, 2021 | 80 hrs | 23,816 (31%) | Winter Storm Uri |
| Sep 2, 2025 | 1 hrs | 19,725 (26%) | Unnamed event |
| Sep 9, 2023 | 31 hrs | 19,711 (26%) | Drought |
| May 7, 2023 | 25 hrs | 13,268 (17%) | Thunderstorm Wind |
| Mar 17, 2018 | 1 hrs | 10,369 (14%) | Unnamed event |
Over the 12 years from 2014 to 2025, Johnson County recorded 1,038 distinct power outage events, averaging 2.2 hours per event.
The single worst outage on record in Johnson County started February 15, 2021 (Winter Storm Uri), lasting 80 hours and leaving up to 23,816 customers without power (31% of the county) at its peak.
May has historically been the worst month for outages in Johnson County, with 125 events recorded during that month across the dataset.
Based on this history, Johnson County earns a Reliability Grade of C, placing it in the 53rd percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Johnson County's outage profile
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Similar counties in Texas
Counties with the closest reliability grade and national percentile to Johnson County.
| County | Grade | National percentile |
|---|---|---|
| Shackelford County | C | 53rd |
| Williamson County | C | 53rd |
| Terry County | C | 52nd |
| Ochiltree County | C | 52nd |
| Kent County | C | 53rd |
FAQ
How often does power go out in Johnson County?
Between 2014 and 2025, Johnson County recorded 1,038 outage events, averaging 2.2 hours each.
What is Johnson County's reliability grade?
Johnson County has a Reliability Grade of C, in the 53rd national percentile.
What was the worst power outage in Johnson County?
The worst outage on record started February 15, 2021 (Winter Storm Uri), lasting 80 hours and affecting up to 23,816 customers.