Avista Corp: power outages per year
In 2025 the average Avista Corp customer was without power for 16.2 hours, more than the Idaho average of 5.4 h; up from 3.8 h in 2024. The utility served 148,201 customers in Idaho and ranks #1 of 2 large Idaho utilities by outage hours.
By year
| Year | Hours (with major events) | Hours (without) | Interruptions | Customers |
|---|---|---|---|---|
| 2025 | 16.2 | 3.5 | 1.9 | 148,201 |
| 2024 | 3.8 | 2.8 | 1.3 | 145,203 |
| 2023 | 2.9 | 2.7 | 1.0 | 142,909 |
| 2022 | 4.3 | 2.8 | 1.3 | 141,190 |
| 2021 | 23.0 | 3.3 | 3.0 | 135,616 |
| 2020 | 6.5 | 2.4 | 1.6 | 156,205 |
"With major events" includes storm days that utilities may exclude from their own reliability targets; it is what customers actually live through. The gap between the two columns shows how much of the year's outage time came from big storms.
Backup power for Avista Corp outages
An average outage here lasted about 8.6 hours in 2025. Size backup for the longest outage you want to ride through, not the average.
Other large utilities in Idaho
FAQ
How many hours a year are Avista Corp customers without power?
16.2 hours per customer in 2025 including major event days (3.5 h without them), as Avista Corp reported to the U.S. EIA.
How long does a typical Avista Corp outage last?
About 8.6 hours on average in 2025 (total outage minutes divided by the number of interruptions). Storms make single events much longer.
Source: U.S. EIA Form 861, Reliability file, 2020–2025. Data snapshot . Utilities ranked nationwide →