County annual report · FIPS 48251
2021 Johnson County, TX Power Outage Report
In 2021, customers in Johnson County, TX went without power for an average of 17.1 hours, a total of 1.3M customer-hours (Texas average 21.0 hours). That ranks 156th worst of 252 Texas counties and 497th of 2,974 nationally.
Compared with TX, the US and 2020
Coverage line is EAGLE-I's share of Texas customers tracked each year.
Biggest outages in Johnson County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | February 14, 2021 11:30 | February 22, 2021 08:45 | 7d 21h | 23,816 | 1.1M |
| 2 | March 17, 2021 08:45 | March 18, 2021 10:00 | 1d 1h | 4,026 | 12K |
| 3 | October 10, 2021 18:15 | October 12, 2021 09:00 | 1d 14h | 3,896 | 12K |
| 4 | January 14, 2021 14:15 | January 15, 2021 06:15 | 16h | 3,316 | 6,670 |
| 5 | January 6, 2021 19:45 | January 7, 2021 04:15 | 8h 30m | 2,981 | 3,606 |
| 6 | October 28, 2021 13:45 | October 30, 2021 03:00 | 1d 13h | 2,647 | 19K |
| 7 | August 30, 2021 22:45 | August 31, 2021 05:00 | 6h 15m | 2,569 | 2,589 |
| 8 | April 12, 2021 16:15 | April 13, 2021 16:00 | 23h 45m | 2,307 | 2,139 |
| 9 | July 16, 2021 13:15 | July 17, 2021 05:45 | 16h 30m | 2,212 | 2,210 |
| 10 | July 25, 2021 03:15 | July 25, 2021 06:00 | 2h 45m | 2,205 | 1,142 |
Outage episodes by size in 2021: 126 reached 100+ customers, 37 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 2021, 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) | 2021 | 13.5 hrs | - | 3.1 hrs | 2.07 |
| HILCO Electric Cooperative, Inc. | 2021 | 13.4 hrs | 3.49 | 1.6 hrs | 0.85 |
| 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 94% of Texas's customers in 2021; 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, 2021, 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/2021/texas/johnson-county