Power outage history
Walworth County Wisconsin
5.2hours
without power for the average customer in a typical year, 2018–2025
20th most of 72 in Wisconsin 20% 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 Walworth's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2023 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.
Walworth, 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 |
|---|---|---|---|---|---|---|
| Feb 22, 2023 | Ice storm | 15,076 | 33% | 2.1 d | 31 h | 274k |
| Jun 22, 2024 | Tornadoes | 13,468 | 30% | 2.1 d | 41 h | 230k |
| Jul 28, 2023 | Thunderstorms | 7,129 | 16% | 42 h | 36 h | 131k |
| Nov 10, 2020 | Thunderstorms | 7,292 | 16% | 23 h | 17 h | 80k |
| Aug 10, 2021 | Thunderstorms | 7,818 | 17% | 24 h | 12 h | 69k |
| Jun 25, 2023 | No storm report | 8,551 | 19% | 12 h | 7.0 h | 65k |
| Jan 17, 2017 | Winter storm | 700 | 2% | 3.7 d | – | 47k |
| May 17, 2017 | Thunderstorms | 3,289 | 7% | 21 h | 9.5 h | 39k |
| Aug 8, 2019 | Thunderstorms | 5,363 | 12% | 18 h | 17 h | 36k |
| Aug 2, 2015 | Thunderstorms | 4,277 | 9% | 15 h | 6.5 h | 35k |
| Jul 12, 2017 | Flooding | 7,329 | 16% | 12 h | 5.2 h | 32k |
| Mar 31, 2023 | Tornadoes | 7,945 | 17% | 9.0 h | 6.0 h | 32k |
| Dec 15, 2021 | Windstorm | 2,260 | 5% | 31 h | – | 31k |
| Aug 10, 2020 | Tornadoes | 7,530 | 17% | 14 h | 5.8 h | 23k |
| Jan 12, 2024 | Winter storm | 2,008 | 4% | 25 h | – | 23k |
| May 15, 2025 | Thunderstorms | 3,390 | 7% | 7.5 h | 6.5 h | 21k |
| Aug 6, 2024 | Thunderstorms | 7,212 | 16% | 7.8 h | 5.0 h | 21k |
| Jul 9, 2020 | Thunderstorms | 3,244 | 7% | 16 h | 14 h | 20k |
| Feb 7, 2019 | Winter storm | 4,006 | 9% | 8.5 h | 4.5 h | 18k |
| Jul 14, 2024 | Thunderstorms | 4,350 | 10% | 8.5 h | 7.0 h | 18k |
| May 7, 2024 | Thunderstorms | 1,938 | 4% | 15 h | – | 15k |
| Jun 30, 2019 | Thunderstorms | 3,164 | 7% | 8.8 h | 6.8 h | 14k |
| Jul 13, 2015 | Thunderstorms | 3,330 | 7% | 6.0 h | 4.2 h | 11k |
| Aug 23, 2025 | No storm report | 2,238 | 5% | 5.8 h | – | 11k |
| Dec 23, 2015 | Windstorm | 3,481 | 8% | 8.0 h | 7.0 h | 10k |
| Jun 12, 2017 | No storm report | 4,112 | 9% | 4.5 h | 3.0 h | 10k |
| Jul 12, 2023 | No storm report | 2,437 | 5% | 3.8 h | 1.0 h | 9.1k |
| Jul 11, 2025 | Thunderstorms | 1,286 | 3% | 8.2 h | – | 8.8k |
| Aug 26, 2018 | No storm report | 2,466 | 5% | 6.2 h | 3.5 h | 8.7k |
| Jul 19, 2019 | No storm report | 3,072 | 7% | 2.8 h | 30 min | 8.4k |
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 Walworth from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Thunderstorms 31%
- No storm on record 24%
- Tornadoes 19%
- Ice storm 18%
- Winter storm 4.0%
- Windstorm 3.0%
Who keeps the lights on
Utilities serving Walworth
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 |
| Wisconsin Power & Light Co | Investor Owned | 96 | 75 | 0.79 | 18.5 | 441k |
| City of Elkhorn | WI | – | – | – | 10.9 | 31k |
| Rock Energy Cooperative | Cooperative | 56 | 37 | 0.53 | 14.3 | 7.4k |
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 45,649 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 →