County annual report · FIPS 48491
2019 Williamson County, TX Power Outage Report
In 2019, customers in Williamson County, TX went without power for an average of 1.8 hours, a total of 525K customer-hours (Texas average 4.9 hours). That ranks 226th worst of 254 Texas counties and 2158th of 2,945 nationally.
Compared with TX, the US and 2018
Coverage line is EAGLE-I's share of Texas customers tracked each year.
Biggest outages in Williamson County, 2019
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | November 11, 2019 17:45 | November 13, 2019 02:30 | 1d 8h | 15,966 | 13K |
| 2 | December 19, 2019 13:30 | December 19, 2019 21:45 | 8h 15m | 12,420 | 3,793 |
| 3 | June 16, 2019 20:45 | June 18, 2019 10:45 | 1d 14h | 9,429 | 55K |
| 4 | December 20, 2019 18:45 | December 21, 2019 04:15 | 9h 30m | 7,831 | 7,981 |
| 5 | November 11, 2019 09:45 | November 11, 2019 16:45 | 7h | 7,239 | 3,534 |
| 6 | May 7, 2019 13:30 | May 9, 2019 22:45 | 2d 9h | 6,894 | 14K |
| 7 | July 8, 2019 13:15 | July 12, 2019 09:15 | 3d 20h | 5,310 | 21K |
| 8 | April 17, 2019 13:15 | April 18, 2019 01:15 | 12h | 4,779 | 3,503 |
| 9 | April 13, 2019 13:15 | April 15, 2019 04:45 | 1d 15h | 4,536 | 36K |
| 10 | October 11, 2019 08:00 | October 12, 2019 06:00 | 22h | 4,503 | 9,001 |
Outage episodes by size in 2019: 199 reached 100+ customers, 61 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 2019, 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 | 2018 | 61 min | 0.77 | 55 min | 0.77 |
| Bluebonnet Electric Coop, Inc | 2018 | 1.5 hrs | 1.17 | 1.5 hrs | 1.17 |
| Bartlett Electric Coop, Inc | 2018 | 1.9 hrs | 1.01 | 50 min | 0.62 |
| Austin Energy | 2018 | 69 min | 0.76 | 48 min | 0.70 |
| 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 93% of Texas's customers in 2019; 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, 2019, 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/2019/texas/williamson-county