Power outage history
Isabella County Michigan
5.8hours
without power for the average customer in a typical year, 2018–2025
73rd most of 83 in Michigan close to 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 Isabella'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 13 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Isabella, 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 |
|---|---|---|---|---|---|---|
| Dec 28, 2025 | No storm report | 7,174 | 20% | 3.5 d | 2.1 d | 253k |
| Dec 26, 2025 | No storm report | 6,357 | 17% | 37 h | 25 h | 105k |
| Aug 27, 2024 | Thunderstorms | 3,989 | 11% | 41 h | 40 h | 86k |
| Aug 10, 2021 | Thunderstorms | 6,851 | 19% | 19 h | 13 h | 78k |
| Jul 20, 2019 | No storm report | 7,611 | 21% | 21 h | 17 h | 72k |
| Aug 24, 2021 | Thunderstorms | 4,603 | 13% | 25 h | 21 h | 69k |
| Dec 1, 2019 | No storm report | 2,613 | 7% | 37 h | 18 h | 50k |
| Dec 11, 2021 | Windstorm | 3,256 | 9% | 32 h | 28 h | 48k |
| Dec 24, 2015 | No storm report | 1,195 | 3% | 42 h | – | 45k |
| Apr 15, 2018 | Winter storm | 9,427 | 26% | 7.2 h | 7.2 h | 33k |
| May 31, 2019 | No storm report | 5,073 | 14% | 11 h | 10 h | 30k |
| Aug 6, 2019 | No storm report | 5,933 | 16% | 8.8 h | 8.0 h | 30k |
| Jul 15, 2025 | No storm report | 4,178 | 11% | 28 h | 25 h | 25k |
| May 15, 2025 | No storm report | 1,558 | 4% | 28 h | – | 23k |
| Feb 7, 2019 | Ice storm | 1,311 | 4% | 24 h | – | 23k |
| Nov 5, 2022 | No storm report | 1,561 | 4% | 18 h | – | 22k |
| Dec 16, 2021 | No storm report | 3,061 | 8% | 33 h | 34 h | 22k |
| Mar 9, 2017 | No storm report | 978 | 3% | 21 h | – | 17k |
| Apr 9, 2015 | No storm report | 3,639 | 10% | 9.0 h | 8.8 h | 17k |
| Dec 5, 2017 | No storm report | 1,411 | 4% | 18 h | – | 15k |
| Jun 11, 2023 | No storm report | 3,695 | 10% | 8.2 h | 2.5 h | 15k |
| Aug 26, 2018 | No storm report | 1,259 | 3% | 19 h | – | 15k |
| Aug 12, 2021 | No storm report | 640 | 2% | 28 h | – | 13k |
| Mar 10, 2017 | No storm report | 755 | 2% | 21 h | – | 13k |
| Mar 25, 2023 | No storm report | 1,515 | 4% | 11 h | – | 12k |
| Oct 20, 2025 | No storm report | 2,310 | 6% | 5.0 h | 5.0 h | 12k |
| Jun 10, 2020 | Thunderstorms | 832 | 2% | 21 h | – | 11k |
| Aug 21, 2021 | No storm report | 1,068 | 3% | 12 h | – | 11k |
| Mar 21, 2015 | No storm report | 712 | 2% | 20 h | – | 10k |
| Sep 14, 2019 | No storm report | 1,525 | 4% | 7.0 h | – | 10k |
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 Isabella from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 70%
- Thunderstorms 21%
- Windstorm 3.6%
- Winter storm 3.3%
- Ice storm 1.9%
Who keeps the lights on
Utilities serving Isabella
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 |
|---|---|---|---|---|---|---|
| DTE Electric Company | Investor Owned | 192 | 151 | 1.16 | 20.3 | 2.1M |
| Consumers Energy Co | Investor Owned | 820 | 164 | 1.40 | 20.7 | 1.7M |
| Tri-County Electric Coop (MI) | Cooperative | 1,153 | 119 | 1.82 | 18.3 | 23k |
| 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 36,507 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 →