Power outage history
Teton County Wyoming
0.9hours
without power for the average customer in a typical year, 2018–2025
20th most of 20 in Wyoming 87% 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 Teton's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2025 was the worst well-recorded year, at 1.8 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Teton, 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 |
|---|---|---|---|---|---|---|
| Oct 27, 2025 | Winter storm | 1,534 | 8% | 5.0 h | 4.8 h | 5.0k |
| Nov 16, 2024 | No storm report | 392 | 2% | 9.5 h | – | 2.9k |
| May 21, 2024 | No storm report | 863 | 5% | 5.5 h | – | 2.5k |
| Jun 19, 2025 | No storm report | 270 | 1% | 6.5 h | – | 1.7k |
| Nov 1, 2019 | No storm report | 327 | 2% | 5.2 h | – | 1.7k |
| Sep 16, 2024 | Wildfire | 494 | 3% | 3.0 h | – | 1.4k |
| May 21, 2025 | No storm report | 195 | 1% | 7.2 h | – | 1.4k |
| Jan 26, 2025 | No storm report | 551 | 3% | 3.0 h | – | 1.4k |
| Jun 22, 2024 | No storm report | 381 | 2% | 3.0 h | – | 1.1k |
| Feb 9, 2019 | No storm report | 519 | 3% | 4.8 h | – | 1.1k |
| Jul 2, 2025 | No storm report | 476 | 3% | 2.2 h | – | 1.0k |
| Sep 9, 2025 | No storm report | 220 | 1% | 4.5 h | – | 970 |
| Jun 9, 2024 | Thunderstorms | 378 | 2% | 2.5 h | – | 825 |
| Sep 10, 2025 | No storm report | 426 | 2% | 1.8 h | – | 746 |
| Mar 22, 2025 | No storm report | 464 | 3% | 1.8 h | – | 670 |
| Jun 20, 2025 | No storm report | 319 | 2% | 2.2 h | – | 660 |
| Jul 9, 2019 | No storm report | 231 | 1% | 2.8 h | – | 635 |
| Mar 23, 2018 | Flooding | 293 | 2% | 2.2 h | – | 621 |
| Nov 6, 2025 | No storm report | 270 | 1% | 2.2 h | – | 608 |
| Oct 24, 2024 | Wildfire | 542 | 3% | 1.2 h | – | 583 |
| Dec 8, 2023 | Winter storm | 204 | 1% | 2.8 h | – | 561 |
| Jun 23, 2024 | No storm report | 275 | 1% | 3.0 h | – | 520 |
| Jun 2, 2024 | No storm report | 287 | 2% | 2.0 h | – | 502 |
| Jan 23, 2020 | No storm report | 295 | 2% | 1.5 h | – | 442 |
| Mar 22, 2025 | No storm report | 196 | 1% | 2.0 h | – | 390 |
| Sep 30, 2025 | No storm report | 205 | 1% | 1.5 h | – | 308 |
| May 12, 2019 | No storm report | 189 | 1% | 1.5 h | – | 284 |
| Mar 2, 2024 | Winter storm | 206 | 1% | 1.2 h | – | 243 |
| Apr 20, 2024 | No storm report | 192 | 1% | 48 min | – | 142 |
| May 28, 2020 | No storm report | 297 | 2% | 30 min | – | 140 |
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 Teton from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 70%
- Winter storm 19%
- Wildfire 6.5%
- Thunderstorms 2.6%
- Flooding 2.0%
Who keeps the lights on
Utilities serving Teton
As each utility reports to the Energy Information Administration for its whole Wyoming territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Lower Valley Energy Inc | Cooperative | – | – | – | 7.0 | 23k |
| High Plains Power Inc | Cooperative | 320 | 263 | – | 14.2 | 13k |
| Fall River Rural Elec Coop Inc | Cooperative | 18 | 18 | 0.15 | 11.0 | 347 |
| NorthWestern Energy LLC | Investor Owned | – | – | – | 12.4 | 299 |
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
- Fremont, ID 4.4 h
- Sublette 4.3 h
- Teton, ID 2.4 h
- Gallatin, MT 1.9 h
- Bonneville, ID 1.8 h
- Park 1.5 h
- Lincoln 1.4 h
- Fremont 1.0 h
- Teton (this county) 0.9 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 18,592 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 →