Power outage history
Bayfield County Wisconsin
3.5hours
without power for the average customer in a typical year, 2018–2025
27th most of 72 in Wisconsin 47% 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 Bayfield's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2022 was the worst well-recorded year, at 8.2 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Bayfield, 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 21, 2016 | Thunderstorms | 5,170 | 80% | 42 h | 25 h | 74k |
| Dec 15, 2022 | No storm report | 2,669 | 41% | 2.4 d | 34 h | 39k |
| Nov 1, 2020 | No storm report | 3,398 | 52% | 5.5 h | 5.2 h | 12k |
| Sep 2, 2025 | No storm report | 1,597 | 25% | 6.5 h | 6.5 h | 8.7k |
| Aug 8, 2017 | No storm report | 3,351 | 52% | 3.2 h | 2.8 h | 8.0k |
| Oct 14, 2017 | No storm report | 734 | 11% | 10 h | 9.8 h | 6.0k |
| Jul 18, 2020 | Thunderstorms | 952 | 15% | 21 h | 15 h | 5.8k |
| Jul 3, 2023 | Thunderstorms | 1,992 | 31% | 7.0 h | 3.5 h | 5.6k |
| Nov 26, 2025 | Winter storm | 566 | 9% | 16 h | 4.8 h | 4.8k |
| Dec 1, 2019 | Winter storm | 489 | 8% | 33 h | 30 h | 4.7k |
| Sep 2, 2017 | No storm report | 691 | 11% | 7.5 h | 7.2 h | 3.4k |
| Jul 26, 2021 | Thunderstorms | 522 | 8% | 12 h | 10 h | 2.9k |
| Aug 9, 2018 | Thunderstorms | 1,456 | 22% | 2.2 h | 4.2 h | 2.7k |
| Jun 2, 2023 | No storm report | 1,230 | 19% | 2.8 h | 2.0 h | 2.6k |
| Nov 27, 2019 | Winter storm | 450 | 7% | 9.5 h | 3.5 h | 2.6k |
| Jun 21, 2025 | Thunderstorms | 310 | 5% | 15 h | – | 2.5k |
| Nov 15, 2020 | Winter storm | 646 | 10% | 3.8 h | 3.2 h | 2.3k |
| Jul 6, 2017 | No storm report | 641 | 10% | 3.5 h | 4.0 h | 2.2k |
| Jul 15, 2019 | Thunderstorms | 601 | 9% | 6.0 h | 4.5 h | 2.2k |
| May 31, 2022 | No storm report | 573 | 9% | 9.0 h | 4.5 h | 2.1k |
| Jun 17, 2018 | Flooding | 430 | 7% | 19 h | 18 h | 2.1k |
| Dec 28, 2025 | Winter storm | 868 | 13% | 3.0 h | 3.0 h | 2.1k |
| Jul 7, 2021 | No storm report | 156 | 2% | 19 h | – | 2.0k |
| Jul 10, 2015 | No storm report | 872 | 13% | 3.2 h | 5.2 h | 2.0k |
| Jul 18, 2020 | Thunderstorms | 159 | 2% | 14 h | – | 1.9k |
| Mar 5, 2022 | Winter storm | 117 | 2% | 21 h | – | 1.9k |
| Apr 26, 2017 | No storm report | 342 | 5% | 6.8 h | 6.2 h | 1.9k |
| Aug 24, 2015 | No storm report | 692 | 11% | 2.8 h | 2.5 h | 1.9k |
| Nov 2, 2025 | No storm report | 618 | 10% | 4.2 h | 9.8 h | 1.8k |
| Sep 3, 2017 | No storm report | 691 | 11% | 5.8 h | 5.0 h | 1.8k |
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 Bayfield from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 65%
- Thunderstorms 19%
- Winter storm 14%
- Flooding 1.9%
Who keeps the lights on
Utilities serving Bayfield
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 |
| Bayfield Electric Coop, Inc | WI | – | – | – | 18.6 | 70k |
| Dahlberg Light & Power Co | Investor Owned | – | – | – | 13.2 | 11k |
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 6,473 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 →