County annual report · FIPS 48491
2025 Williamson County, TX Power Outage Report
In 2025, customers in Williamson County, TX went without power for an average of 2.4 hours, a total of 723K customer-hours (Texas average 4.6 hours). That ranks 228th worst of 254 Texas counties and 2262nd of 3,000 nationally.
Compared with TX, the US and 2024
Coverage line is EAGLE-I's share of Texas customers tracked each year.
Biggest outages in Williamson County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | October 9, 2025 23:15 | October 10, 2025 08:45 | 9h 30m | 13,389 | 27K |
| 2 | March 4, 2025 08:45 | March 6, 2025 04:15 | 1d 19h | 11,215 | 57K |
| 3 | May 5, 2025 11:45 | May 8, 2025 08:15 | 2d 20h | 7,217 | 19K |
| 4 | May 23, 2025 12:00 | May 25, 2025 04:00 | 1d 16h | 6,369 | 18K |
| 5 | June 17, 2025 12:45 | June 18, 2025 02:45 | 14h | 5,690 | 1,554 |
| 6 | August 21, 2025 08:30 | August 23, 2025 04:00 | 1d 19h | 5,407 | 15K |
| 7 | December 4, 2025 00:45 | December 5, 2025 20:15 | 1d 19h | 5,315 | 6,976 |
| 8 | October 14, 2025 14:00 | October 15, 2025 07:15 | 17h 15m | 5,301 | 9,769 |
| 9 | February 3, 2025 14:30 | February 4, 2025 05:30 | 15h | 5,149 | 5,318 |
| 10 | May 27, 2025 01:15 | May 28, 2025 10:15 | 1d 9h | 5,141 | 11K |
Outage episodes by size in 2025: 223 reached 100+ customers, 93 reached 1,000+ customers, 2 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 2025, 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 | 2024 | 57 min | 0.79 | 57 min | 0.79 |
| Bluebonnet Electric Coop, Inc | 2024 | 3.8 hrs | 1.75 | 2.0 hrs | 1.28 |
| Bartlett Electric Coop, Inc | 2024 | 3.2 hrs | 1.50 | 2.3 hrs | 1.15 |
| Austin Energy | 2024 | 1.5 hrs | 0.96 | 76 min | 0.87 |
| 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 2025; 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, 2025, 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/2025/texas/williamson-county