Power outage history
Hancock County Iowa
5.5hours
without power for the average customer in a typical year, 2018–2025
27th most of 98 in Iowa 17% 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 Hancock'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 17 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Hancock, 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 4, 2025 | Winter storm | 4,226 | 77% | 40 h | 25 h | 43k |
| Jul 29, 2025 | Thunderstorms | 5,271 | 96% | 30 h | 17 h | 31k |
| Apr 11, 2019 | Windstorm | 3,720 | 68% | 3.5 d | 11 h | 28k |
| Mar 24, 2018 | Winter storm | 1,826 | 33% | 11 h | 8.0 h | 13k |
| Dec 15, 2021 | Tornadoes | 923 | 17% | 19 h | 7.0 h | 7.1k |
| Apr 13, 2018 | No storm report | 1,402 | 26% | 9.2 h | 8.0 h | 6.2k |
| Aug 16, 2023 | No storm report | 3,351 | 61% | 1.8 h | 1.5 h | 5.4k |
| Apr 18, 2023 | No storm report | 3,371 | 61% | 1.8 h | 1.2 h | 5.1k |
| Nov 27, 2019 | Winter storm | 3,706 | 68% | 5.8 h | 1.0 h | 4.8k |
| Mar 15, 2025 | No storm report | 1,795 | 33% | 1.8 h | 1.5 h | 3.1k |
| Oct 28, 2024 | No storm report | 1,783 | 32% | 1.8 h | 13 h | 3.1k |
| Dec 23, 2020 | Winter storm | 257 | 5% | 16 h | – | 2.9k |
| Apr 23, 2016 | No storm report | 983 | 18% | 3.8 h | 2.8 h | 2.8k |
| Jul 5, 2025 | No storm report | 207 | 4% | 14 h | – | 2.7k |
| Jun 20, 2018 | No storm report | 1,002 | 18% | 2.8 h | 2.8 h | 2.6k |
| Apr 12, 2022 | Thunderstorms | 858 | 16% | 4.2 h | 3.0 h | 2.5k |
| Nov 8, 2024 | No storm report | 1,827 | 33% | 1.2 h | 48 min | 2.3k |
| Aug 1, 2019 | No storm report | 383 | 7% | 5.2 h | 5.2 h | 2.0k |
| May 19, 2025 | No storm report | 1,817 | 33% | 5.5 h | 30 min | 1.7k |
| May 25, 2015 | No storm report | 1,116 | 20% | 1.5 h | 7.0 h | 1.7k |
| Nov 10, 2020 | No storm report | 727 | 13% | 9.2 h | 1.0 h | 1.7k |
| Nov 24, 2020 | No storm report | 403 | 7% | 4.0 h | 4.0 h | 1.6k |
| Jul 22, 2024 | No storm report | 267 | 5% | 5.8 h | – | 1.5k |
| May 8, 2021 | No storm report | 994 | 18% | 1.5 h | 3.2 h | 1.4k |
| Feb 23, 2017 | Winter storm | 995 | 18% | 2.2 h | 1.0 h | 1.4k |
| Jul 8, 2024 | No storm report | 266 | 5% | 4.8 h | – | 1.3k |
| Oct 18, 2018 | No storm report | 264 | 5% | 4.8 h | – | 1.3k |
| Jul 28, 2024 | No storm report | 434 | 8% | 2.8 h | 13 h | 1.2k |
| Dec 27, 2025 | No storm report | 678 | 12% | 1.8 h | 48 min | 1.2k |
| Sep 23, 2023 | No storm report | 517 | 9% | 2.5 h | 1.8 h | 1.2k |
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 Hancock from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 33%
- Winter storm 31%
- Thunderstorms 18%
- Windstorm 14%
- Tornadoes 3.4%
Who keeps the lights on
Utilities serving Hancock
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 |
|---|---|---|---|---|---|---|
| Interstate Power and Light Co | Investor Owned | 89 | 74 | 0.82 | 17.8 | 419k |
| City of Forest City | IA | – | – | – | 10.3 | 13k |
| Boone Valley Electric Coop | IA | – | – | – | – | 5.6k |
| Heartland Power Coop | Cooperative | 117 | 67 | 0.92 | 12.8 | 4.4k |
| Prairie Energy Coop | Cooperative | 428 | 121 | 3.11 | 14.1 | 3.4k |
| City of Corwith | IA | – | – | – | – | 1.1k |
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
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 5,489 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 →