County annual report · FIPS 48251
2018 Johnson County, TX Power Outage Report
In 2018, customers in Johnson County, TX went without power for an average of 2.2 hours, a total of 168K customer-hours (Texas average 2.4 hours). That ranks 179th worst of 253 Texas counties and 1786th 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 Johnson 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 | March 16, 2018 18:30 | March 17, 2018 05:15 | 10h 45m | 10,369 | 5,650 |
| 2 | April 20, 2018 12:15 | April 21, 2018 22:15 | 1d 10h | 3,102 | 3,817 |
| 3 | October 25, 2018 11:30 | October 27, 2018 08:00 | 1d 20h | 2,547 | 3,507 |
| 4 | February 23, 2018 15:30 | February 26, 2018 23:30 | 3d 8h | 2,085 | 2,429 |
| 5 | May 4, 2018 11:15 | May 5, 2018 00:15 | 13h | 1,883 | 3,754 |
| 6 | May 3, 2018 13:15 | May 4, 2018 04:45 | 15h 30m | 1,671 | 5,729 |
| 7 | June 24, 2018 07:45 | June 25, 2018 09:00 | 1d 1h | 1,665 | 7,004 |
| 8 | February 22, 2018 12:15 | February 23, 2018 13:00 | 1d | 1,520 | 2,250 |
| 9 | August 9, 2018 23:15 | August 10, 2018 12:30 | 13h 15m | 1,434 | 3,899 |
| 10 | December 26, 2018 17:45 | December 28, 2018 05:15 | 1d 11h | 1,394 | 6,259 |
Outage episodes by size in 2018: 134 reached 100+ customers, 19 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 Johnson 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 |
| United Electric Coop Service Inc - (TX) | 2018 | 7.6 hrs | 1.36 | 82 min | 0.99 |
| HILCO Electric Cooperative, Inc. | 2018 | 1.7 hrs | 0.92 | 1.6 hrs | 0.92 |
| Texas-New Mexico Power Co | - | - | - | - | - |
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 ÷ 76,674 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. Johnson County has data for 2015, 2017–2025.
Cite this report
MassOutage (massoutage.com), Johnson 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/johnson-county