Power Out Map
– 0% of Iowa out 0 customers out in Wisconsin

Power outage history

Iowa County Wisconsin

3.3hours

without power for the average customer in a typical year, 2018–2025

29th most of 72 in Wisconsin 50% below the national median

Worst outage on record Jul 20, 2017 30% of customers out · 90% back in 17 hours
Hours without power, average customer per year 3.3h / yr State average 3.5 h · national median 6.6 h
Major outages a year 4.5 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 2hours Median across major outages, from the peak
Longest single outage 2.7days Jul 19, 2017, over 1% of customers out
Outage hours on storm days 50% Share falling on days with a NOAA storm report here
Worst year 2024 4.4 hours without power, average customer
Electricity customers 9,067 ORNL customer model · 6 well-covered years

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 Iowa's customers who were without power at that day's worst moment.

20152016201720182019202020212022202320242025
0%100% of customers out

Year by year

Hours in the dark, per customer

2024 was the worst well-recorded year, at 4.4 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Iowa, hours without power per customer

IowaUS median countyWisconsin average
0 2 4 6 8 3.5 ’15 ’16 5.6 ’17 3.5 ’20 3.8 ’21 3.5 ’22 2.7 ’23 4.4 ’24 2.0 ’25 US 6.6 WI 3.5

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 19, 2017 Thunderstorms 2,737 30% 2.7 d 17 h 35k
Dec 15, 2021 Windstorm 3,809 42% 28 h 6.8 h 21k
Jun 26, 2020 No storm report 5,293 58% 2.5 h 1.2 h 12k
May 21, 2024 Thunderstorms 995 11% 35 h 34 h 12k
Jun 22, 2015 Thunderstorms 1,113 12% 30 h 26 h 11k
Mar 31, 2023 Tornadoes 2,304 25% 5.5 h 3.2 h 6.4k
Dec 15, 2022 Winter storm 1,509 17% 11 h 8.8 h 6.1k
Jul 24, 2022 Thunderstorms 2,401 26% 6.2 h 4.0 h 5.8k
May 16, 2024 No storm report 3,018 33% 2.0 h 1.8 h 5.1k
Jul 18, 2025 No storm report 2,981 33% 1.0 h 1.2 h 3.0k
Jul 17, 2020 No storm report 1,212 13% 2.0 h 1.2 h 2.4k
Jun 28, 2017 Thunderstorms 3,211 35% 2.8 h 1.8 h 2.3k

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.

0% 25% 50% 75% 100% peak+24h+48h+72h+96h half back by +2h 90% by +4h

When it happens

The outage clock

Customer-hours out by month (rings, January innermost) and local hour, 2018–2025.

00061218 Jan inside

What was happening

Weather behind the outages

Each outage is matched to NOAA storm reports for Iowa from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.

  • No storm on record 50%
  • Thunderstorms 18%
  • Windstorm 15%
  • Winter storm 9.1%
  • Tornadoes 4.9%
  • Tropical storm 1.2%
  • Flooding 0.9%

Who keeps the lights on

Utilities serving Iowa

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 Power & Light Co Investor Owned 96 75 0.79 18.5 441k
Scenic Rivers Energy Coop Cooperative 105 105 1.17 15.5 14k
Village of Black Earth WI – – – – 9.5k
Village of Muscoda Municipal 11 11 0.04 11.4 934

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

Across Wisconsin

Where it is darkest

Hours / yr64+

All Wisconsin 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 9,067 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 →