County annual report · FIPS 48491
2018 Williamson County, TX Power Outage Report
In 2018, customers in Williamson County, TX went without power for an average of 2.0 hours, a total of 600K customer-hours (Texas average 2.4 hours). That ranks 190th worst of 253 Texas counties and 1872nd of 2,798 nationally.
Compared with TX, the US and 2017
Coverage line is EAGLE-I's share of Texas customers tracked each year.
Biggest outages in Williamson County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 4, 2018 04:45 | June 6, 2018 08:00 | 2d 3h | 22,402 | 173K |
| 2 | November 7, 2018 02:15 | November 8, 2018 07:30 | 1d 5h | 17,196 | 4,459 |
| 3 | April 13, 2018 21:00 | April 16, 2018 06:00 | 2d 9h | 14,110 | 79K |
| 4 | September 22, 2018 01:15 | September 23, 2018 10:30 | 1d 9h | 7,514 | 31K |
| 5 | June 18, 2018 07:15 | June 18, 2018 08:15 | 1h | 6,348 | 5,375 |
| 6 | July 4, 2018 05:00 | July 5, 2018 06:30 | 1d 1h | 5,647 | 11K |
| 7 | March 28, 2018 05:30 | March 29, 2018 05:15 | 23h 45m | 5,131 | 13K |
| 8 | January 3, 2018 12:00 | January 4, 2018 05:00 | 17h | 5,070 | 9,907 |
| 9 | October 24, 2018 12:30 | October 25, 2018 02:30 | 14h | 3,977 | 4,007 |
| 10 | January 16, 2018 02:15 | January 18, 2018 00:00 | 1d 21h | 3,969 | 5,511 |
Outage episodes by size in 2018: 196 reached 100+ customers, 54 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 2018, 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 90% of Texas's customers in 2018; 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, 2018, 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/2018/texas/williamson-county