County annual report · FIPS 48421
2021 Sherman County, TX Power Outage Report
In 2021, customers in Sherman County, TX went without power for an average of 3.7 hours, a total of 2,368 customer-hours (Texas average 21.0 hours). That ranks 231st worst of 252 Texas counties and 1624th 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 Sherman 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 | March 19, 2021 13:45 | March 19, 2021 14:45 | 1h | 1,162 | 880 |
| 2 | February 16, 2021 14:15 | February 16, 2021 16:30 | 2h 15m | 178 | 57 |
| 3 | June 13, 2021 04:45 | June 14, 2021 01:00 | 20h 15m | 53 | 459 |
| 4 | December 17, 2021 17:15 | December 17, 2021 19:15 | 2h | 53 | 93 |
| 5 | September 2, 2021 22:15 | September 3, 2021 04:30 | 6h 15m | 43 | 150 |
| 6 | July 25, 2021 15:45 | July 25, 2021 19:30 | 3h 45m | 39 | 61 |
| 7 | December 15, 2021 17:30 | December 15, 2021 22:30 | 5h | 29 | 72 |
| 8 | December 16, 2021 01:15 | December 16, 2021 23:15 | 22h | 24 | 96 |
| 9 | August 22, 2021 10:45 | August 22, 2021 14:45 | 4h | 22 | 41 |
| 10 | May 3, 2021 19:30 | May 3, 2021 21:45 | 2h 15m | 20 | 45 |
Outage episodes by size in 2021: 2 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 Sherman 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 |
| Tri-County Electric Coop, Inc (OK) | - | - | - | - | - |
| Rita Blanca 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 ÷ 643 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. Sherman County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Sherman 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/sherman-county