Williamson 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 14, 2021 | 93 hrs | 134,418 (34%) | Winter Storm Uri |
| Feb 1, 2023 | 175 hrs | 70,703 (18%) | Winter Storm |
| Feb 11, 2021 | 61 hrs | 28,027 (7%) | Winter Storm Uri |
| Jun 4, 2018 | 22 hrs | 22,402 (6%) | Thunderstorm Wind |
| Mar 21, 2022 | 52 hrs | 22,258 (6%) | Thunderstorm Wind |
Over the 12 years from 2014 to 2025, Williamson County recorded 2,241 distinct power outage events, averaging 2.0 hours per event.
The single worst outage on record in Williamson County started February 14, 2021 (Winter Storm Uri), lasting 93 hours and leaving up to 134,418 customers without power (34% of the county) at its peak.
May has historically been the worst month for outages in Williamson County, with 249 events recorded during that month across the dataset.
Based on this history, Williamson County earns a Reliability Grade of C, placing it in the 53rd percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Williamson County's outage profile
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Similar counties in Texas
Counties with the closest reliability grade and national percentile to Williamson County.
| County | Grade | National percentile |
|---|---|---|
| Kent County | C | 53rd |
| Shackelford County | C | 53rd |
| Johnson County | C | 53rd |
| Terry County | C | 52nd |
| Ochiltree County | C | 52nd |
FAQ
How often does power go out in Williamson County?
Between 2014 and 2025, Williamson County recorded 2,241 outage events, averaging 2.0 hours each.
What is Williamson County's reliability grade?
Williamson County has a Reliability Grade of C, in the 53rd national percentile.
What was the worst power outage in Williamson County?
The worst outage on record started February 14, 2021 (Winter Storm Uri), lasting 93 hours and affecting up to 134,418 customers.