Power outage history
Winona County Minnesota
1.5hours
without power for the average customer in a typical year, 2018–2025
45th most of 54 in Minnesota 77% 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 Winona'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 2.6 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Winona, 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 | Thunderstorms | 2,817 | 13% | 39 h | 35 h | 30k |
| Sep 24, 2019 | Thunderstorms | 1,969 | 9% | 18 h | 16 h | 16k |
| May 21, 2024 | Thunderstorms | 2,167 | 10% | 18 h | 17 h | 11k |
| Jul 15, 2022 | No storm report | 2,271 | 10% | 14 h | 13 h | 8.6k |
| Jun 1, 2023 | No storm report | 4,068 | 19% | 1.5 h | 1.5 h | 6.1k |
| Oct 7, 2015 | No storm report | 933 | 4% | 10 h | – | 5.7k |
| Sep 20, 2025 | No storm report | 1,337 | 6% | 4.0 h | 4.0 h | 5.3k |
| Jun 6, 2024 | No storm report | 1,349 | 6% | 9.5 h | 9.5 h | 5.0k |
| Jan 31, 2019 | Winter storm | 1,636 | 8% | 9.2 h | 14 h | 4.8k |
| Nov 30, 2019 | No storm report | 945 | 4% | 5.0 h | – | 4.2k |
| Nov 5, 2020 | No storm report | 3,314 | 15% | 1.2 h | 30 min | 4.1k |
| Aug 5, 2018 | No storm report | 695 | 3% | 7.0 h | – | 4.0k |
| Oct 11, 2020 | No storm report | 3,162 | 15% | 1.2 h | 30 min | 4.0k |
| Jun 25, 2025 | Tornadoes | 3,382 | 16% | 1.5 h | 48 min | 3.8k |
| Jul 6, 2021 | Thunderstorms | 2,793 | 13% | 1.2 h | 12 min | 3.5k |
| Jul 29, 2021 | No storm report | 576 | 3% | 6.5 h | – | 3.4k |
| Jul 20, 2017 | Flooding | 348 | 2% | 11 h | – | 3.3k |
| Jul 18, 2015 | No storm report | 588 | 3% | 8.8 h | – | 3.0k |
| Oct 18, 2024 | No storm report | 3,387 | 16% | 1.0 h | 48 min | 2.9k |
| Jun 5, 2016 | No storm report | 368 | 2% | 7.8 h | – | 2.9k |
| Dec 18, 2023 | No storm report | 957 | 4% | 2.5 h | – | 2.4k |
| Aug 11, 2018 | No storm report | 1,542 | 7% | 1.5 h | 1.8 h | 2.3k |
| Jan 22, 2021 | No storm report | 931 | 4% | 2.5 h | – | 2.3k |
| Jun 16, 2017 | Thunderstorms | 416 | 2% | 5.2 h | – | 2.2k |
| May 26, 2015 | No storm report | 272 | 1% | 7.5 h | – | 2.0k |
| Mar 31, 2018 | No storm report | 688 | 3% | 2.8 h | – | 1.9k |
| Jul 9, 2022 | No storm report | 221 | 1% | 8.5 h | – | 1.9k |
| Aug 15, 2020 | No storm report | 373 | 2% | 4.8 h | – | 1.8k |
| Nov 24, 2019 | No storm report | 510 | 2% | 3.8 h | – | 1.7k |
| Jun 2, 2020 | Thunderstorms | 319 | 1% | 5.0 h | – | 1.6k |
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 Winona from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 52%
- Thunderstorms 40%
- Winter storm 4.1%
- Tornadoes 2.3%
- Flooding 1.9%
- Tropical storm 0.5%
Who keeps the lights on
Utilities serving Winona
As each utility reports to the Energy Information Administration for its whole Minnesota 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 - Minnesota | Investor Owned | 226 | 115 | 1.38 | 17.1 | 1.2M |
| People's Cooperative Services | Cooperative | 99 | 45 | 1.23 | 17.2 | 22k |
| MiEnergy Cooperative | Cooperative | 213 | 79 | 1.08 | 16.9 | 15k |
| City of St Charles | MN | – | – | – | – | 12k |
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
- Wabasha 3.8 h
- La Crosse, WI 3.2 h
- Buffalo, WI 3.1 h
- Trempealeau, WI 1.7 h
- Houston 1.6 h
- Winona (this county) 1.5 h
- Olmsted 1.2 h
- Fillmore 0.4 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 21,651 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 →