Power outage history
Chickasaw County Iowa
2.2hours
without power for the average customer in a typical year, 2018–2025
71st most of 98 in Iowa 66% 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 Chickasaw's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2021 was the worst well-recorded year, at 4.7 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Chickasaw, 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 |
|---|---|---|---|---|---|---|
| Oct 3, 2025 | No storm report | 309 | 4% | 2.8 d | – | 20k |
| Dec 15, 2021 | Tornadoes | 1,141 | 16% | 40 h | 39 h | 20k |
| May 21, 2024 | No storm report | 1,286 | 18% | 18 h | 17 h | 12k |
| Jul 19, 2017 | Thunderstorms | 1,401 | 20% | 21 h | 11 h | 6.3k |
| Jan 31, 2021 | No storm report | 385 | 6% | 11 h | 12 h | 4.0k |
| Jul 9, 2020 | Thunderstorms | 1,439 | 21% | 2.2 h | 1.5 h | 2.8k |
| Oct 23, 2019 | No storm report | 197 | 3% | 23 h | – | 2.7k |
| Jun 21, 2022 | No storm report | 1,735 | 25% | 2.2 h | 1.8 h | 2.3k |
| May 29, 2021 | No storm report | 132 | 2% | 26 h | – | 2.3k |
| Jul 28, 2025 | No storm report | 1,130 | 16% | 3.0 h | 1.5 h | 2.1k |
| Mar 3, 2024 | No storm report | 872 | 12% | 2.2 h | 7.2 h | 2.0k |
| Dec 11, 2021 | No storm report | 288 | 4% | 9.8 h | – | 1.9k |
| Sep 21, 2016 | Thunderstorms | 643 | 9% | 3.0 h | 1.2 h | 1.9k |
| Jul 20, 2019 | No storm report | 91 | 1% | 20 h | – | 1.8k |
| Jun 22, 2016 | No storm report | 580 | 8% | 3.5 h | 3.0 h | 1.5k |
| Jun 14, 2016 | Thunderstorms | 376 | 5% | 6.0 h | 4.8 h | 1.5k |
| Apr 13, 2018 | Thunderstorms | 642 | 9% | 2.0 h | 11 h | 1.2k |
| Jun 12, 2022 | No storm report | 622 | 9% | 2.2 h | 3.5 h | 1.2k |
| May 2, 2015 | No storm report | 399 | 6% | 2.8 h | 2.8 h | 1.1k |
| Jan 3, 2017 | No storm report | 292 | 4% | 3.5 h | – | 1.0k |
| May 25, 2019 | No storm report | 161 | 2% | 8.0 h | – | 944 |
| Nov 9, 2020 | No storm report | 113 | 2% | 7.8 h | – | 876 |
| Dec 16, 2018 | No storm report | 534 | 8% | 1.8 h | 1.5 h | 796 |
| Mar 11, 2019 | No storm report | 294 | 4% | 2.5 h | – | 687 |
| Jul 28, 2019 | No storm report | 858 | 12% | 1.0 h | 2.2 h | 677 |
| Aug 30, 2024 | No storm report | 616 | 9% | 1.2 h | 1.2 h | 650 |
| Jun 19, 2024 | No storm report | 1,228 | 18% | 1.0 h | 1.5 h | 638 |
| May 17, 2017 | Thunderstorms | 125 | 2% | 4.8 h | – | 538 |
| Mar 5, 2018 | No storm report | 571 | 8% | 1.0 h | 3.2 h | 531 |
| Jul 29, 2025 | No storm report | 249 | 4% | 2.2 h | – | 518 |
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 Chickasaw from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 72%
- Tornadoes 22%
- Thunderstorms 5.3%
- Winter storm 0.9%
Who keeps the lights on
Utilities serving Chickasaw
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 |
| Allamakee-Clayton El Coop, Inc | IA | 142 | 142 | 0.96 | 14.4 | 119k |
| City of New Hampton | IA | – | – | – | 9.4 | 14k |
| MiEnergy Cooperative | Cooperative | 102 | 86 | 0.86 | 17.2 | 6.0k |
| City of Fredericksburg | IA | – | – | – | – | 5.4k |
| Heartland Power Coop | Cooperative | 117 | 67 | 0.92 | 12.8 | 4.4k |
| Butler County Rural Elec Coop | Cooperative | 97 | 85 | 1.45 | 14.5 | 3.9k |
| City of Lawler | IA | – | – | – | – | 1.8k |
| City of Alta Vista | IA | – | – | – | – | 1.2k |
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 6,991 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 →