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

Power outage history

Winneshiek County Iowa

3.5hours

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

52nd most of 98 in Iowa 46% below the national median

Worst outage on record Dec 15, 2021 54% of customers out · 90% back in 16 hours
Hours without power, average customer per year 3.5h / yr State average 5.4 h · national median 6.6 h
Major outages a year 1.5 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 4hours Median across major outages, from the peak
Longest single outage 44hours Jul 19, 2017, over 1% of customers out
Outage hours on storm days 69% Share falling on days with a NOAA storm report here
Worst year 2021 11 hours without power, average customer
Electricity customers 9,369 ORNL customer model · 8 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 Winneshiek'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

2021 was the worst well-recorded year, at 11 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Winneshiek, hours without power per customer

WinneshiekUS median countyIowa average
0 5 10 15 0.9 ’15 2.1 ’16 8.4 ’17 2.4 ’18 2.1 ’19 1.7 ’20 11 ’21 5.7 ’22 0.8 ’23 2.2 ’24 1.9 ’25 US 6.6 IA 5.4

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 Windstorm 5,083 54% 19 h 16 h 84k
Jul 19, 2017 Thunderstorms 3,245 35% 44 h 35 h 45k
Jul 23, 2022 Thunderstorms 5,712 61% 16 h 8.0 h 29k
Jun 30, 2018 Thunderstorms 2,089 22% 19 h 15 h 13k
May 19, 2017 No storm report 1,476 16% 10 h 10 h 12k
Aug 27, 2021 Thunderstorms 2,857 30% 4.0 h 2.2 h 6.9k
Aug 4, 2016 Thunderstorms 1,805 19% 5.2 h 3.8 h 5.7k
May 15, 2017 Thunderstorms 606 6% 18 h 15 h 5.4k
May 3, 2016 No storm report 885 9% 5.5 h 5.2 h 4.3k
Sep 19, 2020 No storm report 4,246 45% 1.0 h 1.0 h 4.2k
Apr 13, 2022 Thunderstorms 1,955 21% 5.8 h 4.8 h 4.1k
Apr 12, 2025 No storm report 1,064 11% 4.0 h 13 h 4.1k

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 +8h

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 Winneshiek from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.

  • Windstorm 38%
  • No storm on record 31%
  • Thunderstorms 29%
  • Winter storm 0.5%

Who keeps the lights on

Utilities serving Winneshiek

As each utility reports to the Energy Information Administration for its whole Iowa territory, not this county alone. Outage minutes include major storm days.

Utility Type Outage min / yr Excl. major storms Outages / yr Residential ¢/kWh Customers
Interstate Power and Light Co Investor Owned 89 74 0.82 17.8 419k
Allamakee-Clayton El Coop, Inc IA 142 142 0.96 14.4 119k
MiEnergy Cooperative Cooperative 102 86 0.86 17.2 6.0k

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 Iowa

Where it is darkest

Hours / yr64+

All Iowa 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 9,369 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 →