Power outage history
Williamson County Texas
6.3hours
without power for the average customer in a typical year, 2018–2025
179th most of 240 in Texas close to the national median
Every day since 2015
Eleven years, one night at a time
Each cell is a day. The brighter it is, the larger the share of Williamson's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2021 was the worst well-recorded year, at 23 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Williamson, hours without power per customer
The record
The biggest outages since 2015
Ranked by customer-hours lost: customers out multiplied by how long they stayed out. Times are local.
| Began | Storm | Peak out | Share | Lasted | 90% restored | Customer-hours |
|---|---|---|---|---|---|---|
| Feb 14, 2021 | Winter storm | 134,418 | 45% | 5.5 d | 2.6 d | 5.8M |
| Feb 1, 2023 | Winter storm | 70,703 | 24% | 4.8 d | 2.6 d | 3.2M |
| Feb 11, 2021 | Winter storm | 28,027 | 9% | 36 h | 30 h | 379k |
| Mar 21, 2022 | Thunderstorms | 22,258 | 7% | 27 h | 27 h | 193k |
| Jun 4, 2018 | Thunderstorms | 22,402 | 7% | 20 h | 19 h | 170k |
| May 29, 2015 | Thunderstorms | 14,477 | 5% | 9.5 h | 11 h | 90k |
| Sep 24, 2023 | Thunderstorms | 10,823 | 4% | 13 h | 13 h | 85k |
| Apr 13, 2018 | Thunderstorms | 14,110 | 5% | 11 h | 15 h | 62k |
| Oct 24, 2022 | Thunderstorms | 9,294 | 3% | 11 h | 17 h | 56k |
| Jan 10, 2021 | Winter storm | 12,139 | 4% | 7.8 h | 6.5 h | 56k |
| Feb 20, 2021 | No storm report | 13,641 | 5% | 4.0 h | 4.0 h | 51k |
| May 24, 2022 | Thunderstorms | 13,479 | 5% | 7.8 h | 5.0 h | 49k |
| May 28, 2021 | No storm report | 13,753 | 5% | 7.0 h | 14 h | 45k |
| May 29, 2024 | No storm report | 11,078 | 4% | 6.2 h | 13 h | 36k |
| Oct 28, 2021 | No storm report | 10,927 | 4% | 7.5 h | 11 h | 36k |
| May 16, 2024 | No storm report | 10,717 | 4% | 6.8 h | 11 h | 34k |
| May 25, 2015 | Flooding | 6,591 | 2% | 8.5 h | 18 h | 34k |
| Jun 17, 2019 | Thunderstorms | 9,429 | 3% | 6.0 h | 9.8 h | 33k |
| Mar 4, 2025 | No storm report | 11,215 | 4% | 5.2 h | 7.8 h | 31k |
| Feb 19, 2025 | No storm report | 5,045 | 2% | 7.0 h | 9.5 h | 28k |
| Apr 9, 2020 | Thunderstorms | 7,945 | 3% | 4.8 h | 8.8 h | 27k |
| Feb 6, 2023 | No storm report | 5,056 | 2% | 7.0 h | 19 h | 26k |
| Sep 28, 2021 | No storm report | 8,198 | 3% | 4.5 h | 4.5 h | 26k |
| Oct 9, 2025 | No storm report | 13,389 | 4% | 2.5 h | 2.2 h | 23k |
| Sep 22, 2018 | Flooding | 7,514 | 3% | 3.5 h | 2.8 h | 20k |
| Nov 4, 2021 | No storm report | 9,130 | 3% | 3.5 h | 1.0 h | 20k |
| Apr 20, 2023 | Flooding | 9,103 | 3% | 3.0 h | 4.5 h | 19k |
| Jun 21, 2020 | No storm report | 4,665 | 2% | 3.8 h | – | 17k |
| Aug 22, 2020 | No storm report | 7,338 | 2% | 3.2 h | 3.8 h | 15k |
| Sep 9, 2022 | No storm report | 4,217 | 1% | 3.2 h | – | 14k |
After the peak
How fast the lights come back
Each line is one major outage, from its peak. The amber line is the typical path.
When it happens
The outage clock
Customer-hours out by month (rings, January innermost) and local hour, 2018–2025.
What was happening
Weather behind the outages
Each outage is matched to NOAA storm reports for Williamson from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Winter storm 83%
- No storm on record 10%
- Thunderstorms 6.3%
Who keeps the lights on
Utilities serving Williamson
As each utility reports to the Energy Information Administration for its whole Texas territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Austin Energy | Municipal | 182 | 77 | 1.29 | 13.1 | 522k |
| Pedernales Electric Coop, Inc | Cooperative | 90 | 78 | 1.16 | 12.8 | 421k |
| Bluebonnet Electric Coop, Inc | Cooperative | 114 | 88 | 1.30 | 11.6 | 119k |
| City of Georgetown | Municipal | 36 | 36 | 0.67 | 13.8 | 32k |
| Bartlett Electric Coop, Inc | Cooperative | 213 | 165 | 1.46 | 15.2 | 12k |
| Oncor Electric Delivery Company LLC | Investor Owned | 232 | 67 | 1.55 | – | – |
EIA Form 861, latest year each utility reported. Outage minutes are SAIDI, the yearly minutes the average customer goes without power; outages a year are SAIFI.
About these numbers
Notes
Outages come from the EAGLE-I record of utility outage maps collected every 15 minutes by Oak Ridge National Laboratory. Hours without power are customer-hours divided by the county's 299,583 electricity customers. Averages use well-covered years from 2018. Outages shorter than 15 minutes, and utilities that publish no outage map, are not in the record, so these figures understate the total. How every number is made →