Power outage history
Carroll County Iowa
1.6hours
without power for the average customer in a typical year, 2018–2025
87th most of 98 in Iowa 75% 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 Carroll's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2025 was the worst well-recorded year, at 3.8 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Carroll, 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 |
|---|---|---|---|---|---|---|
| Mar 19, 2025 | Winter storm | 3,079 | 36% | 28 h | 11 h | 20k |
| Jul 5, 2016 | Thunderstorms | 3,253 | 38% | 18 h | 14 h | 15k |
| Nov 26, 2015 | No storm report | 1,401 | 16% | 17 h | 12 h | 12k |
| Jul 11, 2022 | Thunderstorms | 3,405 | 39% | 5.5 h | 2.2 h | 8.4k |
| Apr 14, 2018 | No storm report | 3,098 | 36% | 15 h | 30 min | 8.2k |
| Jul 30, 2024 | Thunderstorms | 518 | 6% | 18 h | 18 h | 6.5k |
| Dec 15, 2021 | Thunderstorms | 781 | 9% | 15 h | 10 h | 4.6k |
| Mar 4, 2025 | Winter storm | 547 | 6% | 16 h | 14 h | 3.9k |
| Aug 10, 2020 | Thunderstorms | 287 | 3% | 16 h | – | 3.9k |
| Jan 8, 2022 | No storm report | 2,084 | 24% | 2.0 h | 2.0 h | 3.4k |
| Aug 7, 2018 | No storm report | 265 | 3% | 14 h | – | 3.0k |
| Mar 14, 2025 | Thunderstorms | 617 | 7% | 5.5 h | 3.5 h | 2.5k |
| Aug 14, 2021 | No storm report | 1,495 | 17% | 2.2 h | 1.0 h | 2.4k |
| Jun 16, 2021 | Thunderstorms | 707 | 8% | 6.0 h | 4.5 h | 2.3k |
| Jul 14, 2021 | No storm report | 139 | 2% | 15 h | – | 1.8k |
| Dec 14, 2018 | No storm report | 492 | 6% | 4.0 h | 4.5 h | 1.7k |
| May 26, 2016 | Thunderstorms | 333 | 4% | 7.0 h | – | 1.6k |
| May 21, 2024 | Thunderstorms | 1,488 | 17% | 2.0 h | 2.2 h | 1.6k |
| Dec 10, 2025 | No storm report | 1,466 | 17% | 1.0 h | 2.0 h | 1.5k |
| Jan 16, 2019 | No storm report | 437 | 5% | 3.5 h | 3.5 h | 1.4k |
| Jul 22, 2018 | No storm report | 280 | 3% | 7.0 h | – | 1.3k |
| Dec 10, 2021 | No storm report | 540 | 6% | 5.5 h | 2.2 h | 1.2k |
| Dec 26, 2015 | No storm report | 460 | 5% | 3.0 h | 3.0 h | 1.2k |
| Apr 19, 2022 | No storm report | 102 | 1% | 10 h | – | 1.0k |
| Apr 8, 2022 | No storm report | 782 | 9% | 1.5 h | 1.5 h | 978 |
| May 27, 2018 | No storm report | 484 | 6% | 1.5 h | 1.5 h | 726 |
| Apr 27, 2016 | No storm report | 465 | 5% | 1.5 h | 2.8 h | 697 |
| Aug 18, 2025 | No storm report | 518 | 6% | 1.2 h | 12 min | 645 |
| Feb 7, 2016 | Winter storm | 223 | 3% | 3.2 h | – | 637 |
| Sep 16, 2017 | No storm report | 316 | 4% | 2.0 h | – | 631 |
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 Carroll from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 41%
- Thunderstorms 33%
- Winter storm 26%
- Flooding 0.5%
Who keeps the lights on
Utilities serving Carroll
As each utility reports to the Energy Information Administration for its whole Iowa territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| MidAmerican Energy Co | Investor Owned | 205 | 82 | 1.19 | 11.2 | 640k |
| Interstate Power and Light Co | Investor Owned | 89 | 74 | 0.82 | 17.8 | 419k |
| Western Iowa Power Coop | IA | 27 | 27 | 0.27 | 13.5 | 69k |
| Raccoon Valley Electric Cooperative | IA | 39 | 39 | 0.56 | 14.0 | 49k |
| City of Manning | IA | – | – | – | 10.9 | 7.2k |
| City of Glidden | IA | – | – | – | – | 5.6k |
| City of Breda | IA | – | – | – | – | 2.4k |
| City of Coon Rapids | Municipal | – | – | – | 9.8 | 630 |
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.
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 8,666 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 →