County annual report · FIPS 48491
2015 Williamson County, TX Power Outage Report
In 2015, customers in Williamson County, TX went without power for an average of 1.1 hours, a total of 320K customer-hours (Texas average 1.9 hours). That ranks 192nd worst of 238 Texas counties and 1726th of 2,484 nationally.
Compared with TX, the US
Coverage line is EAGLE-I's share of Texas customers tracked each year.
Biggest outages in Williamson County, 2015
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | May 28, 2015 19:15 | May 31, 2015 02:45 | 2d 7h | 14,477 | 104K |
| 2 | May 25, 2015 14:00 | May 28, 2015 16:45 | 3d 2h | 6,591 | 85K |
| 3 | May 17, 2015 10:45 | May 18, 2015 07:00 | 20h 15m | 4,726 | 5,427 |
| 4 | February 9, 2015 16:30 | February 9, 2015 23:15 | 6h 45m | 4,678 | 5,080 |
| 5 | July 2, 2015 14:15 | July 3, 2015 01:30 | 11h 15m | 4,428 | 8,940 |
| 6 | March 18, 2015 16:30 | March 18, 2015 18:00 | 1h 30m | 4,120 | 2,060 |
| 7 | April 10, 2015 18:45 | April 11, 2015 05:30 | 10h 45m | 4,105 | 3,239 |
| 8 | July 18, 2015 05:00 | July 18, 2015 05:30 | 30m | 3,872 | 968 |
| 9 | May 23, 2015 12:30 | May 25, 2015 12:00 | 1d 23h | 3,157 | 16K |
| 10 | December 26, 2015 10:30 | December 26, 2015 12:30 | 2h | 2,462 | 4,307 |
Outage episodes by size in 2015: 77 reached 100+ customers, 20 reached 1,000+ customers, 1 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 2015, 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 | 2015 | 4.5 hrs | 1.88 | 2.4 hrs | 1.36 |
| Bartlett Electric Coop, Inc | 2015 | 3.3 hrs | 1.22 | 2.8 hrs | 0.82 |
| Austin Energy | 2015 | 5.7 hrs | 0.92 | 55 min | 0.72 |
| Pedernales Electric Coop, Inc | - | - | - | - | - |
| Bluebonnet Electric Coop, Inc | - | - | - | - | - |
| 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 2015; 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, 2015, 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/2015/texas/williamson-county