Power outage history
Cassia County Idaho
1.5hours
without power for the average customer in a typical year, 2018–2025
77% 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 Cassia's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2019 was the worst well-recorded year, at 1.6 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Cassia, 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 26, 2023 | No storm report | 3,306 | 22% | 4.5 h | 4.5 h | 12k |
| Feb 23, 2017 | Flooding | 1,728 | 12% | 7.2 h | 7.2 h | 12k |
| Jun 13, 2018 | No storm report | 1,671 | 11% | 6.2 h | 5.5 h | 10.0k |
| Mar 23, 2023 | No storm report | 1,898 | 13% | 6.0 h | 12 h | 8.8k |
| Jan 9, 2024 | Winter storm | 4,987 | 34% | 4.0 h | 4.0 h | 8.2k |
| Aug 18, 2024 | No storm report | 4,239 | 29% | 3.8 h | 2.2 h | 6.9k |
| Aug 25, 2020 | No storm report | 1,397 | 9% | 7.2 h | 7.2 h | 6.0k |
| Aug 20, 2019 | No storm report | 3,714 | 25% | 1.8 h | 1.5 h | 4.9k |
| Jul 17, 2021 | Wildfire | 4,268 | 29% | 1.0 h | 1.0 h | 4.3k |
| Dec 23, 2016 | No storm report | 1,735 | 12% | 2.0 h | 1.8 h | 3.4k |
| Dec 14, 2019 | Winter storm | 4,180 | 28% | 48 min | 48 min | 3.1k |
| Jul 10, 2024 | No storm report | 776 | 5% | 3.8 h | 3.8 h | 2.9k |
| May 1, 2020 | No storm report | 802 | 5% | 3.5 h | 3.5 h | 2.7k |
| Mar 14, 2019 | No storm report | 1,321 | 9% | 2.5 h | 2.2 h | 2.7k |
| Nov 2, 2016 | No storm report | 1,744 | 12% | 1.5 h | 1.5 h | 2.6k |
| Nov 18, 2020 | No storm report | 1,127 | 8% | 2.5 h | 1.8 h | 2.6k |
| Apr 15, 2019 | No storm report | 1,088 | 7% | 2.2 h | 2.2 h | 2.4k |
| Jan 3, 2020 | No storm report | 1,373 | 9% | 1.8 h | 1.8 h | 2.1k |
| Aug 22, 2018 | No storm report | 938 | 6% | 2.0 h | 2.0 h | 1.8k |
| Jan 6, 2017 | No storm report | 1,333 | 9% | 2.5 h | 6.2 h | 1.7k |
| Aug 13, 2018 | No storm report | 1,356 | 9% | 1.2 h | 1.2 h | 1.7k |
| Mar 23, 2025 | No storm report | 300 | 2% | 4.8 h | – | 1.4k |
| Jul 7, 2021 | No storm report | 1,773 | 12% | 48 min | 48 min | 1.3k |
| May 16, 2021 | Thunderstorms | 433 | 3% | 3.0 h | – | 1.3k |
| Nov 1, 2019 | No storm report | 223 | 2% | 5.5 h | – | 1.2k |
| Feb 18, 2018 | No storm report | 221 | 2% | 5.5 h | – | 1.1k |
| Mar 12, 2019 | No storm report | 390 | 3% | 3.2 h | – | 1.0k |
| Sep 11, 2025 | No storm report | 235 | 2% | 4.8 h | – | 1.0k |
| Sep 8, 2019 | No storm report | 327 | 2% | 2.8 h | – | 863 |
| Jun 6, 2023 | Thunderstorms | 228 | 2% | 3.8 h | – | 770 |
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 Cassia from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 79%
- Winter storm 13%
- Wildfire 4.1%
- Thunderstorms 3.1%
- Windstorm 0.8%
Who keeps the lights on
Utilities serving Cassia
As each utility reports to the Energy Information Administration for its whole Idaho territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Idaho Power Co | Investor Owned | 171 | 141 | 1.03 | 11.8 | 540k |
| City of Burley | ID | – | – | – | 7.2 | 42k |
| South Side Electric, Inc | ID | – | – | – | – | 29k |
| East End Mutual Elec Co Ltd | ID | – | – | – | – | 15k |
| United Electric Co-op, Inc | Cooperative | 226 | 118 | 1.52 | 8.5 | 5.2k |
| City of Albion | ID | – | – | – | – | 2.1k |
| City of Declo | ID | – | – | – | – | 1.6k |
| Raft Rural Elec Coop Inc | Cooperative | – | – | – | 10.2 | 1.4k |
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
- Power 18 h
- Blaine 6.2 h
- Oneida 4.9 h
- Box Elder, UT 4.3 h
- Jerome 3.2 h
- Elko, NV 2.8 h
- Twin Falls 2.0 h
- Cassia (this county) 1.5 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 14,726 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 →