Interstate Power and Light Co: power outages per year
In 2025 the average Interstate Power and Light Co customer was without power for 1.5 hours, less than the Iowa average of 2.5 h; down from 1.9 h in 2024. The utility served 500,416 customers in Iowa and ranks #2 of 2 large Iowa utilities by outage hours.
By year
| Year | Hours (with major events) | Hours (without) | Interruptions | Customers |
|---|---|---|---|---|
| 2025 | 1.5 | 1.2 | 0.8 | 500,416 |
| 2024 | 1.9 | 1.7 | 1.1 | 499,530 |
| 2023 | 2.5 | 1.5 | 1.0 | 493,095 |
| 2022 | 1.2 | 1.1 | 0.7 | 485,646 |
| 2021 | 1.8 | 1.2 | 0.8 | 482,928 |
| 2020 | 53.0 | 1.5 | 1.5 | 483,526 |
"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 Interstate Power and Light Co outages
An average outage here lasted about 1.8 hours in 2025. Size backup for the longest outage you want to ride through, not the average.
Other large utilities in Iowa
FAQ
How many hours a year are Interstate Power and Light Co customers without power?
1.5 hours per customer in 2025 including major event days (1.2 h without them), as Interstate Power and Light Co reported to the U.S. EIA.
How long does a typical Interstate Power and Light Co outage last?
About 1.8 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 →