County annual report · FIPS 48011
2021 Armstrong County, TX Power Outage Report
In 2021, customers in Armstrong County, TX went without power for an average of 10.4 hours, a total of 4,706 customer-hours (Texas average 21.0 hours). That ranks 188th worst of 252 Texas counties and 757th 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 Armstrong 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 16, 2021 13:00 | February 16, 2021 21:00 | 8h | 1,054 | 1,069 |
| 2 | October 27, 2021 16:30 | October 27, 2021 18:00 | 1h 30m | 377 | 566 |
| 3 | March 17, 2021 11:15 | March 18, 2021 18:15 | 1d 7h | 177 | 1,503 |
| 4 | June 26, 2021 04:15 | June 26, 2021 08:15 | 4h | 174 | 475 |
| 5 | October 4, 2021 19:00 | October 4, 2021 20:30 | 1h 30m | 157 | 236 |
| 6 | September 15, 2021 17:00 | September 15, 2021 18:45 | 1h 45m | 55 | 76 |
| 7 | December 2, 2021 00:15 | December 2, 2021 03:00 | 2h 45m | 52 | 131 |
| 8 | December 3, 2021 19:30 | December 3, 2021 21:45 | 2h 15m | 52 | 92 |
| 9 | January 27, 2021 20:30 | January 27, 2021 22:15 | 1h 45m | 51 | 70 |
| 10 | February 23, 2021 19:00 | February 23, 2021 19:30 | 30m | 42 | 21 |
Outage episodes by size in 2021: 5 reached 100+ customers, 1 reached 1,000+ customers, 0 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 Armstrong 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 |
|---|---|---|---|---|---|
| Southwestern Public Service Co | 2021 | 3.2 hrs | 1.75 | 2.0 hrs | 1.07 |
| Greenbelt Electric Coop, Inc | - | - | - | - | - |
| Swisher Electric Coop, Inc | - | - | - | - | - |
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 ÷ 452 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. Armstrong County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Armstrong 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/armstrong-county