County annual report · FIPS 48491
2023 Williamson County, TX Power Outage Report
In 2023, customers in Williamson County, TX went without power for an average of 14.0 hours, a total of 4.2M customer-hours (Texas average 8.1 hours). That ranks 94th worst of 252 Texas counties and 621st of 2,977 nationally.
Compared with TX, the US and 2022
Coverage line is EAGLE-I's share of Texas customers tracked each year.
Biggest outages in Williamson County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | January 31, 2023 10:30 | February 15, 2023 07:15 | 14d 20h | 70,703 | 3.4M |
| 2 | September 24, 2023 12:15 | September 28, 2023 22:00 | 4d 9h | 10,823 | 97K |
| 3 | May 5, 2023 07:45 | May 7, 2023 04:15 | 1d 20h | 10,243 | 30K |
| 4 | October 31, 2023 17:15 | November 2, 2023 06:45 | 1d 13h | 9,278 | 4,655 |
| 5 | April 19, 2023 22:15 | April 22, 2023 02:15 | 2d 4h | 9,103 | 33K |
| 6 | September 21, 2023 13:00 | September 22, 2023 02:45 | 13h 45m | 8,878 | 2,415 |
| 7 | July 8, 2023 04:15 | July 8, 2023 15:00 | 10h 45m | 7,949 | 8,237 |
| 8 | September 2, 2023 22:45 | September 3, 2023 06:00 | 7h 15m | 7,562 | 12K |
| 9 | June 21, 2023 20:45 | June 24, 2023 04:30 | 2d 7h | 7,080 | 22K |
| 10 | February 28, 2023 00:30 | March 2, 2023 08:45 | 2d 8h | 6,910 | 9,205 |
Outage episodes by size in 2023: 208 reached 100+ customers, 104 reached 1,000+ customers, 3 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving Williamson County reported on EIA Form 861 for 2023, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| Oncor Electric Delivery Company LLC | 2017 | 3.4 hrs | 1.69 | 2.4 hrs | 1.49 |
| Pedernales Electric Coop, Inc | 2023 | 4.6 hrs | 1.19 | 76 min | 0.85 |
| Bluebonnet Electric Coop, Inc | 2023 | 5.2 hrs | 1.66 | 1.7 hrs | 1.25 |
| Bartlett Electric Coop, Inc | 2023 | 35.3 hrs | 5.01 | 3.9 hrs | 3.99 |
| Austin Energy | 2023 | 54.4 hrs | 1.49 | 84 min | 0.82 |
| City of Bartlett - (TX) | - | - | - | - | - |
| City of Georgetown - (TX) | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about n/a of Texas's customers in 2023; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 299,583 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. Williamson County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Williamson County, TX annual power outage report, 2023, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2023/texas/williamson-county