Power outage history
Ozaukee County Wisconsin
5.5hours
without power for the average customer in a typical year, 2018–2025
19th most of 72 in Wisconsin 17% 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 Ozaukee's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2022 was the worst well-recorded year, at 10.0 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Ozaukee, 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 |
|---|---|---|---|---|---|---|
| Jan 12, 2024 | Winter storm | 10,592 | 31% | 45 h | 19 h | 171k |
| Nov 5, 2022 | Thunderstorms | 8,398 | 24% | 41 h | 25 h | 132k |
| Dec 16, 2021 | Windstorm | 5,880 | 17% | 44 h | 34 h | 107k |
| Jul 23, 2022 | Thunderstorms | 4,596 | 13% | 27 h | 20 h | 96k |
| Mar 9, 2023 | Winter storm | 9,699 | 28% | 23 h | 11 h | 70k |
| Aug 28, 2018 | Flooding | 3,472 | 10% | 32 h | 28 h | 60k |
| Jun 15, 2022 | Heat | 7,224 | 21% | 31 h | 16 h | 48k |
| Aug 10, 2021 | Thunderstorms | 4,056 | 12% | 37 h | 4.8 h | 36k |
| Nov 30, 2025 | Winter storm | 6,942 | 20% | 11 h | 8.0 h | 29k |
| Jul 18, 2019 | No storm report | 6,801 | 20% | 7.5 h | 5.0 h | 29k |
| Jun 27, 2019 | Thunderstorms | 2,289 | 7% | 19 h | 23 h | 24k |
| Aug 27, 2024 | Thunderstorms | 4,801 | 14% | 8.0 h | 7.8 h | 19k |
| Aug 6, 2021 | No storm report | 4,824 | 14% | 6.8 h | 4.0 h | 18k |
| Jun 12, 2017 | No storm report | 2,680 | 8% | 11 h | 8.5 h | 16k |
| Jun 4, 2025 | No storm report | 3,296 | 10% | 5.5 h | 4.5 h | 16k |
| Jun 25, 2023 | No storm report | 3,617 | 11% | 4.2 h | 4.2 h | 15k |
| Mar 24, 2016 | Winter storm | 1,745 | 5% | 17 h | 8.2 h | 15k |
| Sep 25, 2022 | No storm report | 3,913 | 11% | 5.8 h | 2.8 h | 13k |
| Aug 10, 2025 | Flooding | 1,607 | 5% | 14 h | – | 13k |
| Aug 8, 2021 | Flooding | 1,189 | 3% | 9.8 h | – | 11k |
| Jul 1, 2018 | Thunderstorms | 2,944 | 9% | 8.2 h | 5.5 h | 11k |
| May 1, 2024 | No storm report | 4,476 | 13% | 4.5 h | 4.8 h | 11k |
| May 8, 2019 | No storm report | 2,619 | 8% | 3.8 h | 3.5 h | 9.8k |
| Jun 30, 2019 | No storm report | 2,304 | 7% | 6.2 h | 3.8 h | 9.0k |
| Apr 1, 2020 | No storm report | 2,745 | 8% | 3.2 h | 48 min | 8.9k |
| Jul 29, 2023 | No storm report | 913 | 3% | 13 h | – | 8.8k |
| Jun 2, 2020 | Thunderstorms | 1,624 | 5% | 7.8 h | – | 8.6k |
| Jul 13, 2024 | No storm report | 3,305 | 10% | 3.0 h | 1.0 h | 8.5k |
| Mar 16, 2016 | Windstorm | 2,961 | 9% | 6.5 h | 6.8 h | 8.3k |
| Jun 24, 2024 | No storm report | 3,497 | 10% | 2.5 h | 1.5 h | 8.2k |
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 Ozaukee from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 31%
- Thunderstorms 26%
- Winter storm 23%
- Windstorm 8.9%
- Flooding 7.4%
- Heat 4.3%
Who keeps the lights on
Utilities serving Ozaukee
As each utility reports to the Energy Information Administration for its whole Wisconsin territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Wisconsin Electric Power Co | Investor Owned | 185 | 93 | 0.90 | 20.5 | 1.1M |
| Cedarburg Light & Water Comm | Municipal | 67 | 0 | 0.43 | 13.4 | 6.2k |
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
- Waukesha 6.9 h
- Ozaukee (this county) 5.5 h
- Sheboygan 4.5 h
- Washington 3.4 h
- Milwaukee 3.1 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 34,422 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 →