Power outage history
Rock County Wisconsin
1.8hours
without power for the average customer in a typical year, 2018–2025
50th most of 72 in Wisconsin 72% 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 Rock's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2024 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.
Rock, 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 |
|---|---|---|---|---|---|---|
| Jul 14, 2024 | Thunderstorms | 12,673 | 22% | 21 h | 4.5 h | 51k |
| Jun 22, 2024 | Thunderstorms | 6,407 | 11% | 24 h | 22 h | 39k |
| Apr 11, 2019 | Flooding | 9,625 | 17% | 2.0 h | 2.5 h | 17k |
| Apr 15, 2015 | No storm report | 9,902 | 18% | 1.5 h | 1.0 h | 15k |
| Sep 18, 2015 | Thunderstorms | 4,802 | 9% | 4.2 h | 3.5 h | 15k |
| Jul 28, 2023 | No storm report | 2,991 | 5% | 8.5 h | 7.8 h | 12k |
| Mar 15, 2025 | Thunderstorms | 1,634 | 3% | 18 h | – | 12k |
| Oct 20, 2018 | Flooding | 2,656 | 5% | 4.5 h | – | 11k |
| Jan 10, 2020 | Winter storm | 1,696 | 3% | 13 h | – | 11k |
| Aug 5, 2023 | No storm report | 4,700 | 8% | 2.5 h | 5.5 h | 11k |
| Aug 16, 2025 | Thunderstorms | 2,553 | 5% | 8.0 h | – | 10k |
| Jun 29, 2020 | Flooding | 3,542 | 6% | 3.8 h | 3.2 h | 9.9k |
| Aug 24, 2018 | Flooding | 3,389 | 6% | 2.8 h | 1.8 h | 9.3k |
| Sep 17, 2015 | Thunderstorms | 2,762 | 5% | 4.0 h | – | 7.9k |
| Jun 28, 2017 | Tornadoes | 1,438 | 3% | 8.8 h | – | 7.9k |
| Sep 11, 2018 | Flooding | 2,654 | 5% | 3.0 h | – | 7.8k |
| Jun 27, 2019 | Thunderstorms | 2,023 | 4% | 4.0 h | – | 6.9k |
| Jul 17, 2021 | No storm report | 2,144 | 4% | 3.8 h | – | 6.7k |
| Aug 10, 2021 | No storm report | 1,637 | 3% | 5.5 h | – | 5.8k |
| Jul 14, 2017 | No storm report | 4,085 | 7% | 1.2 h | 1.0 h | 5.1k |
| Feb 7, 2019 | Winter storm | 2,790 | 5% | 2.0 h | – | 5.0k |
| Apr 30, 2023 | No storm report | 1,493 | 3% | 3.2 h | – | 4.8k |
| Jul 15, 2024 | Flooding | 2,217 | 4% | 4.2 h | – | 4.7k |
| Aug 7, 2022 | Heat | 3,078 | 5% | 1.5 h | 30 min | 4.6k |
| Jul 15, 2021 | Thunderstorms | 1,682 | 3% | 3.2 h | – | 4.5k |
| Apr 4, 2021 | No storm report | 1,214 | 2% | 3.8 h | – | 4.4k |
| Mar 31, 2023 | Tornadoes | 1,687 | 3% | 5.0 h | – | 4.1k |
| May 21, 2024 | Thunderstorms | 2,342 | 4% | 3.5 h | – | 4.1k |
| Jul 2, 2019 | No storm report | 2,860 | 5% | 1.5 h | 1.5 h | 4.0k |
| Jan 30, 2019 | Winter storm | 1,674 | 3% | 3.2 h | – | 3.9k |
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 Rock from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 41%
- Thunderstorms 33%
- Flooding 15%
- Winter storm 6.3%
- Heat 1.8%
- Tornadoes 1.6%
- Ice storm 0.8%
- Windstorm 0.6%
Who keeps the lights on
Utilities serving Rock
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 Stoughton | Municipal | 34 | 34 | 0.33 | 12.8 | 8.3k |
| Rock Energy Cooperative | Cooperative | 56 | 37 | 0.53 | 14.3 | 7.4k |
| City of Evansville | Municipal | – | – | – | 13.2 | 3.5k |
| Brodhead Water & Lighting Comm | Municipal | – | – | – | 13.5 | 1.5k |
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 56,401 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 →