Cook County, Illinois Power Outages, 2015 to 2023

Cook County, Illinois had 7 major outages from 2015 to 2023

Lower outage time among US counties

Residents here averaged 0.30 times the US outage time per person and 0.70 times the Illinois rate. It ranks 75 of 95 in the state, where 1 has the most. Data confidence: High, with 9 years of records.

0.8major outages per year

5 of 9years with a major outage

106 hrslongest major outage

Aug, Junhardest months

August and June made up 50% of this county's outage time. The largest outage on record began Aug 11, 2020, reached 163,464 customers, and left at least 200 customers out for 43.2 hours.

Outage time per resident, rated Illinois counties

MostLeast

Outage impact by year

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

10M

15M

20M

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

Show yearly numbers

Year	Customer-hours	Reported outages	Major outages
2015	3,070,199	1214	0
2016	1,950,762	544	1
2017	2,458,228	978	0
2018	4,431,695	1095	1
2019	2,198,194	1092	0
2020	11,785,839	1155	3
2021	3,205,409	1251	1
2022	2,800,758	1112	1
2023	1,921,288	1110	0

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, 2020	43.2	163,464	4,009,785
Aug 10, 2020	13.2	279,858	2,587,753
Nov 25, 2018	106.5	101,662	2,304,169
Aug 11, 2020	10.8	200,977	1,987,526
Aug 13, 2020	78.2	44,483	1,241,157

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.