Power outage history
Allegan County Michigan
9.4hours
without power for the average customer in a typical year, 2018–2025
59th most of 83 in Michigan 1.4× 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 Allegan'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 15 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Allegan, 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 |
|---|---|---|---|---|---|---|
| May 15, 2025 | Thunderstorms | 14,042 | 16% | 3.7 d | 3.4 d | 650k |
| Aug 11, 2021 | Tornadoes | 14,053 | 16% | 3.9 d | 2.5 h | 485k |
| Jul 20, 2019 | Thunderstorms | 12,997 | 15% | 2.4 d | 2.3 d | 413k |
| Aug 29, 2022 | Thunderstorms | 15,922 | 18% | 2.3 d | 5.0 h | 358k |
| Feb 22, 2023 | Ice storm | 8,226 | 9% | 2.9 d | 2.1 d | 277k |
| Aug 10, 2021 | Thunderstorms | 15,331 | 18% | 20 h | 19 h | 253k |
| Mar 30, 2025 | Thunderstorms | 9,480 | 11% | 48 h | 45 h | 215k |
| Aug 3, 2022 | Thunderstorms | 8,979 | 10% | 36 h | 30 h | 191k |
| Feb 24, 2019 | Windstorm | 5,656 | 7% | 43 h | 37 h | 136k |
| Nov 27, 2019 | No storm report | 4,870 | 6% | 45 h | 34 h | 130k |
| Jun 9, 2020 | Thunderstorms | 3,686 | 4% | 2.9 d | – | 121k |
| Dec 11, 2021 | Windstorm | 7,495 | 9% | 36 h | 30 h | 120k |
| Jul 7, 2017 | No storm report | 11,957 | 14% | 37 h | 34 h | 114k |
| Jan 12, 2024 | Winter storm | 4,578 | 5% | 42 h | 42 h | 95k |
| Aug 28, 2018 | Thunderstorms | 4,632 | 5% | 32 h | 35 h | 94k |
| Dec 24, 2015 | No storm report | 3,005 | 3% | 38 h | – | 84k |
| Oct 11, 2021 | No storm report | 7,534 | 9% | 21 h | 17 h | 82k |
| Nov 15, 2020 | No storm report | 3,711 | 4% | 30 h | – | 71k |
| Nov 5, 2022 | No storm report | 2,797 | 3% | 36 h | – | 70k |
| Mar 9, 2017 | No storm report | 4,693 | 5% | 21 h | 33 h | 66k |
| Apr 14, 2018 | Winter storm | 3,705 | 4% | 31 h | – | 62k |
| Jun 25, 2024 | Thunderstorms | 3,976 | 5% | 30 h | – | 59k |
| Jun 1, 2019 | Thunderstorms | 4,025 | 5% | 17 h | – | 52k |
| Oct 20, 2018 | No storm report | 4,090 | 5% | 22 h | – | 52k |
| Nov 13, 2021 | No storm report | 4,639 | 5% | 17 h | 22 h | 47k |
| Feb 25, 2016 | Winter storm | 5,204 | 6% | 15 h | 7.0 h | 46k |
| Dec 28, 2015 | No storm report | 4,337 | 5% | 17 h | 18 h | 42k |
| Feb 7, 2019 | Ice storm | 2,895 | 3% | 22 h | – | 36k |
| Oct 25, 2023 | No storm report | 7,737 | 9% | 5.5 h | 3.5 h | 36k |
| Apr 12, 2024 | No storm report | 3,756 | 4% | 15 h | – | 35k |
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 Allegan from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Thunderstorms 49%
- No storm on record 26%
- Tornadoes 9.4%
- Ice storm 6.1%
- Windstorm 5.3%
- Winter storm 3.7%
Who keeps the lights on
Utilities serving Allegan
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 |
|---|---|---|---|---|---|---|
| Consumers Energy Co | Investor Owned | 820 | 164 | 1.40 | 20.7 | 1.7M |
| Great Lakes Energy Coop | Cooperative | 4,401 | 315 | 4.09 | 20.3 | 123k |
| Indiana Michigan Power Co | Investor Owned | 932 | 142 | 1.83 | 17.2 | 113k |
| City of South Haven | MI | – | – | – | 14.8 | 49k |
| City of Holland | Municipal | 71 | 33 | 0.40 | 11.4 | 27k |
| 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.
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 86,725 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 →