Power outages in Idaho
In 2025, the average Idaho customer had 5.4 hours (322.4 minutes) without power over the year. That is above the US median of 4.3 hours (258.7 minutes) across 50 states compared.
Trend
Outage time fell from 5.4 hours in 2020 to a low of 2.3 hours in 2023, then rose to 3.9 hours in 2024 and 5.4 hours in 2025. The worst year was 2021, at 7.9 hours.
Utilities in 2025
The best utility by SAIDI in 2025 was Fall River Rural Elec Coop Inc at 0.1 hours (7.3 minutes). The worst was Northern Lights, Inc at 17.6 hours (1,053.9 minutes).
| Utility | Customers | Hours / yr | Interruptions |
|---|---|---|---|
| Northern Lights, Inc | 19,250 | 17.6 | — |
| Avista Corp | 148,201 | 16.2 | 1.9 |
| Kootenai Electric Cooperative | 35,029 | 6.1 | 1.4 |
| Idaho Power Co | 636,130 | 2.8 | 1.0 |
| PacifiCorp | 91,462 | 2.4 | 1.2 |
| City of Idaho Falls - (ID) | 33,875 | 0.8 | 0.5 |
| Fall River Rural Elec Coop Inc | 18,819 | 0.1 | 0.1 |
What this means for backup power
For everyday outages, enter 4.6 hours in the calculator, which is the average length of one interruption. To plan for a year like 2021, size for 7.9 hours, which is all of that year's outage hours.
FAQ
How many hours a year is the power out in Idaho?
In 2025, the average customer had 5.4 hours (322.4 minutes) of outages. The worst year in the data was 2021, at 7.9 hours.
How long does one outage last in Idaho?
One interruption lasts 4.6 hours on average. This is different from the yearly total, which adds up all outages in a year.
How many outages does a customer have per year?
In 2025, the average Idaho customer had 1.158 interruptions. At 4.6 hours each on average, that is a useful starting point for sizing backup power.
Utility pages
Source: U.S. EIA Form 861 Reliability file. Data snapshot 2026-11-05.