Waukesha County, Wisconsin Power Outages, 2015 to 2023

Waukesha County, Wisconsin had 33 major outages from 2015 to 2023

Below middle outage time among US counties

Residents here averaged 0.63 times the US outage time per person and 1.14 times the Wisconsin rate. It ranks 22 of 70 in the state, where 1 has the most. Data confidence: High, with 9 years of records.

3.7major outages per year

8 of 9years with a major outage

76 hrslongest major outage

Jul, Aughardest months

July and August made up 42% of this county's outage time. The largest outage on record began Aug 11, 2021, reached 29,256 customers, and left at least 200 customers out for 76.2 hours.

Outage time per resident, rated Wisconsin counties

MostLeast

Outage impact by year

Customer-hours without power. 1,000 customers out for 2 hours is 2,000 customer-hours.

0.5M

1.5M

2015'152016'162017'172018'182019'192020'202021'212022'222023'23

Show yearly numbers

Year	Customer-hours	Reported outages	Major outages
2015	263,966	91	4
2016	301,926	111	4
2017	242,751	82	2
2018	267,883	116	0
2019	813,694	117	4
2020	446,547	121	5
2021	1,565,368	123	4
2022	840,728	114	7
2023	1,022,380	115	3

When outages hit

Share of this county's customer-hours by month.

10%

20%

30%

40%

JanJFebFMarMAprAMayMJunJJulJAugASepSOctONovNDecD

Largest outages on record

Start date	Hours	Peak customers	Customer-hours
Aug 11, 2021	76.2	29,256	622,540
Jul 29, 2023	64.0	23,527	471,386
Jun 27, 2019	39.8	19,874	279,224
Nov 5, 2022	41.8	15,243	244,565
Jun 25, 2023	39.2	17,105	225,016

Hours measure how long at least 200 customers in the county were out. Most customers get power back sooner.

Size your backup battery

Start with what you would keep running. Wattages are typical averages, so check your own appliances.

Phones, Wi-Fi, lights, about 60 WRefrigerator, about 60 WChest freezer, about 40 WGas furnace fan, about 160 W

Hours to cover: 24

1,700 Whof battery capacity, allowing for about 15% conversion loss

If anyone relies on medical equipment, plan that with their provider. Run portable fuel generators outdoors only, at least 20 feet from doors, windows and vents. See the outage checklist.

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How to read this

A major outage lasted at least 8 hours and reached customers equal to at least 1% of county residents.
Records cover outages of at least 200 customers in a county. They do not show what happened on your street.
Utilities that do not report can make a county look better than it is. Data ends in 2023. Read the full method.