Power outage history
Trempealeau County Wisconsin
1.7hours
without power for the average customer in a typical year, 2018–2025
54th most of 72 in Wisconsin 74% 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 Trempealeau'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 3.4 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Trempealeau, 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 15, 2021 | Tornadoes | 2,900 | 20% | 18 h | 13 h | 30k |
| Jul 13, 2024 | Thunderstorms | 1,725 | 12% | 25 h | 22 h | 16k |
| Apr 16, 2023 | Winter storm | 836 | 6% | 25 h | 25 h | 11k |
| May 21, 2024 | Tornadoes | 631 | 4% | 18 h | – | 8.3k |
| Jul 28, 2023 | Thunderstorms | 1,460 | 10% | 14 h | 11 h | 6.3k |
| Jul 28, 2017 | No storm report | 1,397 | 9% | 4.5 h | 6.2 h | 6.2k |
| Dec 15, 2022 | Winter storm | 630 | 4% | 16 h | – | 6.1k |
| Jul 18, 2015 | Thunderstorms | 796 | 5% | 10 h | 3.8 h | 4.4k |
| Aug 29, 2021 | No storm report | 1,450 | 10% | 3.0 h | 5.8 h | 4.3k |
| Jul 29, 2025 | Thunderstorms | 1,071 | 7% | 5.0 h | 4.0 h | 4.0k |
| Jul 20, 2019 | Thunderstorms | 984 | 7% | 7.2 h | 5.2 h | 3.9k |
| Sep 20, 2025 | No storm report | 406 | 3% | 9.5 h | – | 3.9k |
| Jun 10, 2016 | Thunderstorms | 880 | 6% | 5.5 h | 2.2 h | 3.8k |
| Dec 21, 2022 | Winter storm | 771 | 5% | 6.8 h | 7.0 h | 3.5k |
| Jul 28, 2021 | Thunderstorms | 527 | 4% | 8.2 h | – | 3.1k |
| Jun 17, 2021 | Thunderstorms | 383 | 3% | 7.2 h | – | 2.4k |
| Jul 19, 2020 | Tornadoes | 1,448 | 10% | 1.5 h | 9.2 h | 2.2k |
| Jul 18, 2015 | No storm report | 639 | 4% | 3.5 h | – | 2.1k |
| Jun 14, 2016 | No storm report | 762 | 5% | 4.5 h | 10 h | 1.9k |
| Sep 24, 2019 | Thunderstorms | 219 | 1% | 9.0 h | – | 1.7k |
| Jan 25, 2024 | No storm report | 1,350 | 9% | 1.2 h | 1.2 h | 1.7k |
| May 2, 2023 | Flooding | 330 | 2% | 8.0 h | – | 1.7k |
| Jan 7, 2022 | No storm report | 316 | 2% | 6.2 h | – | 1.7k |
| Dec 2, 2022 | No storm report | 713 | 5% | 3.0 h | – | 1.7k |
| Apr 8, 2019 | No storm report | 507 | 3% | 3.2 h | – | 1.6k |
| Jun 27, 2019 | No storm report | 565 | 4% | 2.8 h | – | 1.5k |
| Jun 16, 2018 | Thunderstorms | 309 | 2% | 5.2 h | – | 1.5k |
| Jul 6, 2025 | No storm report | 524 | 4% | 3.0 h | – | 1.4k |
| Sep 6, 2015 | Thunderstorms | 529 | 4% | 2.8 h | – | 1.4k |
| Feb 17, 2018 | No storm report | 363 | 2% | 3.8 h | – | 1.4k |
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 Trempealeau from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 28%
- Tornadoes 27%
- Thunderstorms 27%
- Winter storm 15%
- Flooding 1.1%
- Wildfire 0.6%
Who keeps the lights on
Utilities serving Trempealeau
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 |
|---|---|---|---|---|---|---|
| Northern States Power Co | Investor Owned | 309 | 110 | 1.15 | 15.6 | 223k |
| Eau Claire Electric Coop | WI | 203 | 94 | 1.30 | 13.7 | 136k |
| Jackson Electric Coop, Inc | WI | – | – | – | 14.1 | 89k |
| Riverland Energy Cooperative | Cooperative | 170 | 134 | 1.53 | 16.2 | 19k |
| City of Arcadia | WI | – | – | – | – | 12k |
| Village of Trempealeau | WI | – | – | – | – | 8.9k |
| Whitehall Electric Utility | Municipal | – | – | – | 12.5 | 782 |
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
- La Crosse 3.2 h
- Buffalo 3.1 h
- Trempealeau (this county) 1.7 h
- Winona, MN 1.5 h
- Eau Claire 1.4 h
- Jackson 0.6 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 14,810 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 →