massoutage

2021 Wisconsin Power Outage Report

In 2021, the average Wisconsin customer went without power for about 4.7 hours — the 21st worst of any US state that year, 1.5× the state's decade average. Figures from DOE/ORNL EAGLE-I.

Avg hrs / customer
4.7
Peak customers out
64,397
Rank (worst state)
21st
Counties affected
20

Wisconsin outages over the decade

Average hours without power per customer, 2021 highlighted.

1.5h20151.9h20162.9h20171.7h20184.4h20191.8h20204.7h20214.6h20223.4h20234.6h20243.9h2025

Hardest-hit Wisconsin counties in 2021

By peak customers out during the year's worst event.

1Milwaukee County64,3972Waukesha County45,4253Vilas County19,1234Oneida County16,9095St. Croix County13,3806Marathon County11,5777Dane County11,4308Kenosha County10,8239Washington County10,32610Outagamie County9,99511Lincoln County9,75212Brown County8,79613Eau Claire County8,65414Door County8,57315Walworth County7,81816Fond du Lac County7,23817Racine County6,94518Jefferson County6,94119Marinette County6,37620Green Lake County6,350

Biggest Wisconsin outages of 2021

CountyBeganPeak customers out
Milwaukee CountyAugust 10, 202164,397
Milwaukee CountyAugust 11, 202163,517
Milwaukee CountyAugust 11, 202162,447
Milwaukee CountyAugust 11, 202161,356
Waukesha CountyAugust 11, 202145,425
Milwaukee CountyDecember 15, 202131,980
Waukesha CountyAugust 11, 202129,851
Waukesha CountyAugust 11, 202129,256
Waukesha CountyAugust 11, 202125,987
Vilas CountyJuly 27, 202119,123
Wisconsin by year:20252024202320222020201920182017
Other states in 2021:LAMIWVTXORMS

Part of the 2021 US Power Outage Report. Source: DOE/ORNL EAGLE-I. “Avg hours per customer” is a SAIDI-like measure (outage customer-minutes ÷ tracked customers); coverage varies by year.