Power outage history
Cass County Michigan
13hours
without power for the average customer in a typical year, 2018–2025
43rd most of 83 in Michigan 2.0× 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 Cass'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 28 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Cass, 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 30, 2025 | Tornadoes | 11,912 | 45% | 4.2 d | 2.0 d | 427k |
| May 15, 2025 | Thunderstorms | 5,082 | 19% | 2.1 d | 48 h | 144k |
| Jun 13, 2022 | Thunderstorms | 8,698 | 33% | 3.0 d | 33 h | 140k |
| Aug 11, 2021 | Thunderstorms | 4,566 | 17% | 2.4 d | 27 h | 78k |
| Jul 21, 2022 | Thunderstorms | 3,928 | 15% | 48 h | 23 h | 77k |
| Aug 10, 2020 | No storm report | 3,568 | 14% | 23 h | 20 h | 59k |
| Jun 20, 2021 | Thunderstorms | 4,687 | 18% | 26 h | 14 h | 51k |
| Jan 1, 2021 | Winter storm | 5,837 | 22% | 22 h | 17 h | 50k |
| May 7, 2024 | Tornadoes | 2,147 | 8% | 44 h | 43 h | 39k |
| Aug 29, 2022 | Thunderstorms | 5,825 | 22% | 20 h | 3.0 h | 35k |
| Jul 16, 2024 | No storm report | 4,081 | 16% | 21 h | 15 h | 34k |
| Nov 5, 2022 | No storm report | 2,959 | 11% | 23 h | 18 h | 31k |
| Jun 26, 2021 | Thunderstorms | 2,537 | 10% | 19 h | 18 h | 31k |
| Oct 11, 2021 | No storm report | 2,106 | 8% | 23 h | 18 h | 30k |
| Jul 26, 2023 | Thunderstorms | 4,119 | 16% | 11 h | 8.2 h | 29k |
| Dec 11, 2021 | Windstorm | 3,195 | 12% | 28 h | 13 h | 26k |
| Jun 16, 2024 | Thunderstorms | 2,090 | 8% | 21 h | 20 h | 25k |
| Jun 5, 2021 | No storm report | 1,714 | 7% | 14 h | 14 h | 23k |
| Sep 26, 2021 | No storm report | 4,959 | 19% | 5.2 h | 5.8 h | 21k |
| Mar 3, 2023 | Winter storm | 2,056 | 8% | 19 h | 14 h | 21k |
| Jul 26, 2025 | No storm report | 1,512 | 6% | 15 h | 16 h | 20k |
| Jul 25, 2022 | No storm report | 1,751 | 7% | 13 h | 7.2 h | 19k |
| Jul 10, 2019 | No storm report | 2,873 | 11% | 18 h | 15 h | 19k |
| Apr 27, 2022 | No storm report | 6,562 | 25% | 3.2 h | 2.8 h | 18k |
| Feb 28, 2017 | Tornadoes | 2,245 | 9% | 8.0 h | 5.2 h | 17k |
| Aug 2, 2018 | Thunderstorms | 1,134 | 4% | 17 h | – | 17k |
| Jul 18, 2016 | No storm report | 1,364 | 5% | 13 h | 12 h | 17k |
| Mar 8, 2017 | Windstorm | 1,449 | 6% | 25 h | 18 h | 17k |
| Dec 29, 2025 | Winter storm | 1,441 | 5% | 13 h | 2.5 h | 16k |
| Feb 24, 2019 | No storm report | 1,194 | 5% | 27 h | – | 16k |
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 Cass from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 40%
- Thunderstorms 31%
- Tornadoes 21%
- Winter storm 5.6%
- Windstorm 1.4%
Who keeps the lights on
Utilities serving Cass
As each utility reports to the Energy Information Administration for its whole Michigan territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Indiana Michigan Power Co | Investor Owned | 932 | 142 | 1.83 | 17.2 | 113k |
| Midwest Energy Cooperative | Cooperative | 1,012 | 268 | 2.10 | 19.5 | 29k |
| City of Dowagiac | MI | – | – | – | – | 17k |
| Wolverine Power Supply Coop | Cooperative | – | – | – | – | – |
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
- Van Buren 25 h
- St. Joseph 22 h
- Kalamazoo 16 h
- Cass (this county) 13 h
- Berrien 11 h
- Elkhart, IN 9.0 h
- St. Joseph, IN 8.5 h
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 26,320 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 →