Power outage history
Sherman County Texas
5.6hours
without power for the average customer in a typical year, 2018–2025
189th most of 240 in Texas 15% below the national median
Every day since 2015
Eleven years, one night at a time
Each cell is a day. The brighter it is, the larger the share of Sherman's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2023 was the worst well-recorded year, at 9.4 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Sherman, hours without power per customer
The record
The biggest outages since 2015
Ranked by customer-hours lost: customers out multiplied by how long they stayed out. Times are local.
| Began | Storm | Peak out | Share | Lasted | 90% restored | Customer-hours |
|---|---|---|---|---|---|---|
| Apr 30, 2017 | Winter storm | 1,215 | 86% | 42 h | 3.0 h | 33k |
| Aug 5, 2023 | Thunderstorms | 1,419 | 100% | 16 h | 8.5 h | 6.6k |
| Aug 8, 2025 | No storm report | 1,251 | 88% | 5.0 h | 4.0 h | 5.9k |
| Dec 27, 2018 | Winter storm | 1,419 | 100% | 9.5 h | 9.5 h | 4.6k |
| Jun 19, 2020 | No storm report | 1,310 | 92% | 5.8 h | 2.0 h | 3.4k |
| Jun 20, 2020 | No storm report | 1,165 | 82% | 2.5 h | 2.5 h | 2.9k |
| Jun 28, 2024 | No storm report | 1,153 | 81% | 3.5 h | 2.2 h | 2.7k |
| Jul 2, 2022 | No storm report | 1,146 | 81% | 3.5 h | 2.2 h | 2.7k |
| Jun 13, 2023 | Thunderstorms | 1,278 | 90% | 5.8 h | 3.0 h | 2.3k |
| Jul 31, 2015 | No storm report | 1,112 | 78% | 2.0 h | 2.0 h | 2.2k |
| Jul 18, 2024 | No storm report | 1,196 | 84% | 1.8 h | 8.5 h | 2.1k |
| May 27, 2024 | No storm report | 1,154 | 81% | 1.8 h | 1.8 h | 2.0k |
| Jul 29, 2016 | No storm report | 1,139 | 80% | 1.8 h | 1.0 h | 2.0k |
| Apr 29, 2016 | Thunderstorms | 1,114 | 79% | 4.5 h | 1.5 h | 1.8k |
| Jan 17, 2020 | No storm report | 1,115 | 79% | 1.5 h | 3.8 h | 1.7k |
| Jul 18, 2016 | No storm report | 652 | 46% | 3.0 h | 2.8 h | 1.6k |
| Jun 7, 2015 | No storm report | 1,110 | 78% | 1.2 h | 1.2 h | 1.4k |
| Jun 12, 2023 | Thunderstorms | 854 | 60% | 1.8 h | 1.8 h | 1.2k |
| Apr 11, 2017 | No storm report | 1,149 | 81% | 1.0 h | 1.0 h | 1.1k |
| Jul 16, 2020 | No storm report | 1,127 | 79% | 1.0 h | 1.0 h | 1.1k |
| Dec 27, 2018 | Winter storm | 1,119 | 79% | 1.0 h | 1.0 h | 1.1k |
| Mar 13, 2019 | Windstorm | 49 | 3% | 23 h | – | 1.1k |
| May 31, 2015 | No storm report | 1,136 | 80% | 1.0 h | 48 min | 1.0k |
| Mar 19, 2021 | No storm report | 1,162 | 82% | 1.0 h | 48 min | 880 |
| May 16, 2016 | Thunderstorms | 659 | 46% | 1.5 h | 30 min | 852 |
| Mar 30, 2023 | No storm report | 423 | 30% | 2.0 h | 2.0 h | 846 |
| Aug 15, 2023 | No storm report | 213 | 15% | 4.0 h | 3.0 h | 777 |
| Aug 27, 2017 | No storm report | 325 | 23% | 5.2 h | 1.8 h | 765 |
| Oct 7, 2018 | No storm report | 199 | 14% | 3.8 h | 2.8 h | 736 |
| Jun 21, 2017 | Thunderstorms | 42 | 3% | 21 h | – | 688 |
After the peak
How fast the lights come back
Each line is one major outage, from its peak. The amber line is the typical path.
When it happens
The outage clock
Customer-hours out by month (rings, January innermost) and local hour, 2018–2025.
What was happening
Weather behind the outages
Each outage is matched to NOAA storm reports for Sherman from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 65%
- Thunderstorms 20%
- Winter storm 11%
- Windstorm 4.2%
Who keeps the lights on
Utilities serving Sherman
As each utility reports to the Energy Information Administration for its whole Texas territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Southwestern Public Service Co | Investor Owned | 441 | 151 | 1.71 | 13.9 | 224k |
| Rita Blanca Electric Coop, Inc | Cooperative | 885 | 159 | 4.12 | 8.4 | 1.2k |
| Tri-County Electric Coop, Inc (OK) | Cooperative | – | – | – | 15.6 | 220 |
EIA Form 861, latest year each utility reported. Outage minutes are SAIDI, the yearly minutes the average customer goes without power; outages a year are SAIFI.
Next door
Neighbouring counties
- Hutchinson 15 h
- Hansford 13 h
- Cimarron, OK 12 h
- Moore 11 h
- Sherman (this county) 5.6 h
- Hartley 3.0 h
- Dallam 2.5 h
- Texas, OK 1.2 h
About these numbers
Notes
Outages come from the EAGLE-I record of utility outage maps collected every 15 minutes by Oak Ridge National Laboratory. Hours without power are customer-hours divided by the county's 1,419 electricity customers. Averages use well-covered years from 2018. Outages shorter than 15 minutes, and utilities that publish no outage map, are not in the record, so these figures understate the total. How every number is made →