Power outage history
Clark County Wisconsin
2.5hours
without power for the average customer in a typical year, 2018–2025
42nd most of 72 in Wisconsin 63% 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 Clark'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 5.3 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Clark, 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 | 4,358 | 27% | 46 h | 35 h | 72k |
| Jul 19, 2019 | Thunderstorms | 2,458 | 15% | 37 h | 5.8 h | 34k |
| May 21, 2024 | Tornadoes | 2,939 | 18% | 23 h | 19 h | 30k |
| May 15, 2025 | Tornadoes | 2,505 | 16% | 2.0 d | 2.0 d | 27k |
| Dec 15, 2022 | Winter storm | 2,448 | 15% | 18 h | 10 h | 24k |
| Nov 6, 2015 | No storm report | 1,731 | 11% | 8.8 h | 8.2 h | 12k |
| Aug 29, 2016 | No storm report | 1,263 | 8% | 7.0 h | 8.8 h | 8.5k |
| Jul 13, 2015 | No storm report | 1,077 | 7% | 13 h | 8.5 h | 8.4k |
| Aug 24, 2021 | Thunderstorms | 1,115 | 7% | 8.2 h | 8.5 h | 5.2k |
| Jul 13, 2018 | Thunderstorms | 1,757 | 11% | 3.2 h | 1.8 h | 5.2k |
| May 26, 2020 | Thunderstorms | 1,153 | 7% | 7.8 h | 7.8 h | 5.1k |
| Aug 17, 2023 | No storm report | 2,450 | 15% | 5.0 h | 2.0 h | 4.6k |
| Jun 17, 2024 | Tornadoes | 961 | 6% | 6.8 h | 11 h | 4.1k |
| Jun 17, 2018 | Thunderstorms | 622 | 4% | 13 h | – | 4.0k |
| Aug 3, 2022 | Thunderstorms | 791 | 5% | 6.2 h | – | 4.0k |
| Aug 16, 2022 | No storm report | 482 | 3% | 6.8 h | – | 2.7k |
| Jun 18, 2024 | No storm report | 2,450 | 15% | 1.8 h | 1.8 h | 2.6k |
| May 29, 2025 | No storm report | 408 | 3% | 6.2 h | – | 2.5k |
| Mar 2, 2019 | No storm report | 1,136 | 7% | 2.0 h | 2.0 h | 2.3k |
| Jul 5, 2017 | No storm report | 1,683 | 11% | 1.2 h | 1.2 h | 2.1k |
| May 24, 2017 | No storm report | 333 | 2% | 5.8 h | – | 1.9k |
| Feb 24, 2019 | Winter storm | 329 | 2% | 5.5 h | – | 1.8k |
| Jul 1, 2018 | No storm report | 1,694 | 11% | 1.2 h | 1.2 h | 1.7k |
| Jul 13, 2024 | No storm report | 509 | 3% | 3.2 h | – | 1.7k |
| May 11, 2022 | No storm report | 3,536 | 22% | 30 min | 4.0 h | 1.6k |
| Jul 29, 2025 | No storm report | 652 | 4% | 2.5 h | – | 1.6k |
| May 28, 2018 | No storm report | 1,153 | 7% | 1.5 h | 1.2 h | 1.5k |
| Jul 3, 2023 | No storm report | 790 | 5% | 2.5 h | – | 1.4k |
| Jan 13, 2016 | No storm report | 1,405 | 9% | 1.0 h | 1.8 h | 1.4k |
| Jul 5, 2023 | No storm report | 1,299 | 8% | 1.0 h | 1.0 h | 1.3k |
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 Clark from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Tornadoes 49%
- Thunderstorms 23%
- No storm on record 17%
- Winter storm 10%
Who keeps the lights on
Utilities serving Clark
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 |
| Taylor Electric Coop | WI | 38 | 30 | – | 14.3 | 56k |
| City of Marshfield | Municipal | 13 | 10 | 0.14 | 10.3 | 12k |
| Clark Electric Coop | Cooperative | – | – | – | 14.4 | 9.6k |
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
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 15,996 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 →