Power outage history
Rosebud County Montana
3.1hours
without power for the average customer in a typical year, 2018–2025
53% 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 Rosebud's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2021 was the worst well-recorded year, at 5.8 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Rosebud, 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 |
|---|---|---|---|---|---|---|
| Sep 19, 2019 | No storm report | 1,072 | 23% | 8.2 h | 8.2 h | 8.8k |
| Aug 30, 2018 | No storm report | 1,143 | 25% | 6.2 h | 1.0 h | 7.1k |
| Jan 30, 2023 | No storm report | 1,162 | 25% | 9.2 h | 6.0 h | 6.9k |
| Dec 19, 2025 | No storm report | 1,172 | 25% | 5.8 h | 3.8 h | 4.8k |
| Sep 24, 2021 | No storm report | 1,152 | 25% | 4.2 h | 4.2 h | 4.3k |
| Jul 12, 2020 | No storm report | 1,232 | 27% | 11 h | 1.5 h | 4.1k |
| Jul 13, 2019 | No storm report | 1,071 | 23% | 3.8 h | 3.5 h | 4.0k |
| Jun 22, 2024 | No storm report | 145 | 3% | 41 h | – | 3.1k |
| Aug 1, 2019 | No storm report | 781 | 17% | 4.0 h | 4.0 h | 3.1k |
| Aug 18, 2017 | No storm report | 1,170 | 25% | 4.0 h | 4.0 h | 3.0k |
| Jun 5, 2019 | No storm report | 1,130 | 24% | 2.8 h | 2.8 h | 3.0k |
| Sep 8, 2021 | No storm report | 329 | 7% | 8.5 h | 7.2 h | 2.7k |
| May 7, 2024 | Windstorm | 171 | 4% | 27 h | – | 2.4k |
| Jul 13, 2020 | No storm report | 325 | 7% | 21 h | 2.2 h | 2.1k |
| Sep 2, 2025 | No storm report | 1,141 | 25% | 2.0 h | 2.0 h | 1.9k |
| May 6, 2021 | No storm report | 1,085 | 23% | 1.8 h | 11 h | 1.9k |
| Sep 13, 2021 | No storm report | 328 | 7% | 8.5 h | 3.0 h | 1.9k |
| Jan 13, 2021 | Windstorm | 1,172 | 25% | 1.5 h | 1.5 h | 1.8k |
| Apr 23, 2022 | Winter storm | 1,163 | 25% | 1.5 h | 12 min | 1.7k |
| Sep 17, 2021 | No storm report | 316 | 7% | 5.0 h | 5.0 h | 1.5k |
| Mar 29, 2021 | Windstorm | 481 | 10% | 3.2 h | 12 min | 1.5k |
| Feb 22, 2021 | Windstorm | 1,168 | 25% | 2.0 h | 1.2 h | 1.5k |
| Oct 26, 2017 | No storm report | 1,185 | 26% | 1.2 h | 1.0 h | 1.5k |
| May 5, 2018 | No storm report | 1,138 | 24% | 1.2 h | 1.2 h | 1.4k |
| May 26, 2021 | No storm report | 1,075 | 23% | 1.5 h | 1.2 h | 1.4k |
| Mar 5, 2020 | No storm report | 142 | 3% | 18 h | – | 1.3k |
| Nov 2, 2021 | No storm report | 1,182 | 25% | 1.0 h | 8.8 h | 1.2k |
| Mar 26, 2022 | No storm report | 242 | 5% | 5.8 h | 3.8 h | 1.2k |
| May 23, 2022 | No storm report | 1,162 | 25% | 1.0 h | 48 min | 1.2k |
| Oct 12, 2021 | No storm report | 1,157 | 25% | 1.0 h | 1.8 h | 1.1k |
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 Rosebud from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 87%
- Windstorm 8.9%
- Thunderstorms 2.4%
- Winter storm 1.7%
Who keeps the lights on
Utilities serving Rosebud
As each utility reports to the Energy Information Administration for its whole Montana territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| NorthWestern Energy LLC | Investor Owned | 125 | 117 | 1.10 | 14.4 | 334k |
| Tongue River Electric Coop Inc | MT | – | – | – | 14.1 | 56k |
| McCone Electric Coop Inc | MT | – | – | – | 13.5 | 49k |
| Montana-Dakota Utilities Co | Investor Owned | 146 | 146 | 1.23 | 12.3 | 20k |
| Mid-Yellowstone Elec Coop, Inc | MT | 207 | 207 | 2.22 | 12.5 | 15k |
| WAPA-- Western Area Power Administration | Federal | – | – | – | – | – |
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
- Musselshell 5.6 h
- Rosebud (this county) 3.1 h
- Yellowstone 2.4 h
- Big Horn 0.9 h
- Custer 0.6 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 4,647 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 →