County annual report · FIPS 48491
2020 Williamson County, TX Power Outage Report
In 2020, customers in Williamson County, TX went without power for an average of 1.6 hours, a total of 474K customer-hours (Texas average 5.3 hours). That ranks 233rd worst of 254 Texas counties and 2430th of 3,019 nationally.
Compared with TX, the US and 2019
Coverage line is EAGLE-I's share of Texas customers tracked each year.
Biggest outages in Williamson County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | April 2, 2020 11:45 | April 3, 2020 04:45 | 17h | 9,786 | 9,369 |
| 2 | April 9, 2020 10:15 | April 11, 2020 07:15 | 1d 21h | 7,945 | 45K |
| 3 | August 22, 2020 10:15 | August 23, 2020 06:00 | 19h 45m | 7,338 | 21K |
| 4 | November 19, 2020 13:45 | December 8, 2020 02:15 | 18d 12h | 7,244 | 31K |
| 5 | December 11, 2020 14:45 | December 12, 2020 02:30 | 11h 45m | 7,152 | 7,123 |
| 6 | December 8, 2020 14:15 | December 9, 2020 22:00 | 1d 7h | 6,631 | 11K |
| 7 | March 4, 2020 10:45 | March 5, 2020 08:00 | 21h 15m | 6,216 | 17K |
| 8 | February 7, 2020 13:30 | February 8, 2020 00:15 | 10h 45m | 6,166 | 1,682 |
| 9 | May 27, 2020 21:15 | May 29, 2020 02:15 | 1d 5h | 5,480 | 11K |
| 10 | May 25, 2020 00:30 | May 26, 2020 05:45 | 1d 5h | 4,909 | 6,478 |
Outage episodes by size in 2020: 192 reached 100+ customers, 72 reached 1,000+ customers, 0 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 2020, 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 | 2020 | 58 min | 0.68 | 58 min | 0.68 |
| Bluebonnet Electric Coop, Inc | 2020 | 2.5 hrs | 1.13 | 79 min | 0.89 |
| Bartlett Electric Coop, Inc | 2020 | 2.1 hrs | 1.44 | 27 min | 0.27 |
| Austin Energy | 2020 | 54 min | 0.68 | 54 min | 0.68 |
| 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 63% of Texas's customers in 2020; 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, 2020, 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/2020/texas/williamson-county