Power outage history
Marshall County Iowa
24hours
without power for the average customer in a typical year, 2018–2025
1st most of 98 in Iowa 3.7× 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 Marshall's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2020 was the worst well-recorded year, at 6.0 days for the average customer. Hatched years have a thin record and are left out of the averages.
Marshall, 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 |
|---|---|---|---|---|---|---|
| Aug 10, 2020 | Thunderstorms | 15,945 | 100% | 13.1 d | 3.2 h | 2.2M |
| Jul 19, 2018 | Tornadoes | 8,657 | 54% | 7.6 d | 5.5 d | 464k |
| Jun 15, 2019 | Thunderstorms | 7,166 | 45% | 8.5 h | 3.0 h | 29k |
| Apr 11, 2025 | No storm report | 1,186 | 7% | 2.7 d | 2.5 d | 21k |
| Mar 24, 2018 | Winter storm | 1,731 | 11% | 36 h | 25 h | 16k |
| May 18, 2017 | No storm report | 1,379 | 9% | 15 h | 10 h | 14k |
| Jun 11, 2016 | Thunderstorms | 1,802 | 11% | 13 h | 6.8 h | 12k |
| Oct 31, 2017 | No storm report | 7,750 | 49% | 1.8 h | 1.2 h | 12k |
| Sep 6, 2020 | No storm report | 4,337 | 27% | 12 h | 2.2 h | 11k |
| Jul 8, 2020 | No storm report | 275 | 2% | 30 h | – | 8.0k |
| Jul 17, 2016 | No storm report | 3,778 | 24% | 7.5 h | 2.0 h | 7.0k |
| May 26, 2016 | Thunderstorms | 1,198 | 8% | 9.5 h | 8.5 h | 6.8k |
| Jun 6, 2018 | Thunderstorms | 1,854 | 12% | 7.5 h | 6.5 h | 6.7k |
| Jun 20, 2025 | Thunderstorms | 1,832 | 11% | 5.5 h | 4.5 h | 6.4k |
| Feb 1, 2015 | Winter storm | 1,766 | 11% | 7.0 h | 5.8 h | 5.6k |
| Aug 29, 2024 | No storm report | 1,597 | 10% | 4.2 h | 4.2 h | 5.5k |
| Jun 16, 2017 | Thunderstorms | 4,311 | 27% | 3.2 h | 48 min | 5.1k |
| Mar 4, 2025 | No storm report | 2,107 | 13% | 2.2 h | 1.5 h | 4.7k |
| Dec 28, 2025 | No storm report | 1,462 | 9% | 3.0 h | 1.0 h | 4.4k |
| Oct 28, 2015 | No storm report | 4,058 | 25% | 2.2 h | 1.2 h | 4.1k |
| Jul 11, 2022 | No storm report | 3,089 | 19% | 1.2 h | 30 min | 3.8k |
| Aug 29, 2018 | No storm report | 3,500 | 22% | 1.5 h | 1.0 h | 3.7k |
| May 21, 2024 | Flooding | 1,038 | 7% | 5.5 h | 3.0 h | 3.5k |
| Aug 20, 2019 | No storm report | 2,608 | 16% | 3.0 h | 2.2 h | 3.5k |
| Oct 24, 2024 | No storm report | 830 | 5% | 4.0 h | 13 h | 3.3k |
| Jul 22, 2025 | No storm report | 1,654 | 10% | 2.8 h | 2.2 h | 3.3k |
| Dec 19, 2024 | No storm report | 1,634 | 10% | 2.0 h | 6.0 h | 3.2k |
| Sep 22, 2025 | No storm report | 370 | 2% | 8.5 h | – | 3.1k |
| Sep 30, 2021 | No storm report | 822 | 5% | 11 h | 10 h | 3.1k |
| Jul 30, 2025 | Thunderstorms | 1,035 | 6% | 5.8 h | 10 h | 3.1k |
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 Marshall from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Thunderstorms 78%
- Tornadoes 16%
- No storm on record 5.7%
- Winter storm 0.6%
Who keeps the lights on
Utilities serving Marshall
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 |
| Grundy County Rural Elec Coop | IA | 62 | 62 | 0.86 | 14.1 | 28k |
| Midland Power Coop | Cooperative | 488 | 91 | 1.79 | 13.7 | 12k |
| City of State Center | IA | – | – | – | – | 9.1k |
| Consumers Energy Coop | Cooperative | 94 | 94 | 0.74 | 14.8 | 7.1k |
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.
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 15,945 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 →