McHenry County, Illinois Power Outages, 2015 to 2023

McHenry County, Illinois had 19 major outages from 2015 to 2023

Below middle outage time among US counties

Residents here averaged 0.49 times the US outage time per person and 1.15 times the Illinois rate. It ranks 51 of 95 in the state, where 1 has the most. Data confidence: High, with 9 years of records.

2.1major outages per year

7 of 9years with a major outage

72 hrslongest major outage

Aug, Febhardest months

August and February made up 61% of this county's outage time. The largest outage on record began Feb 22, 2023, reached 36,109 customers, and left at least 200 customers out for 71.8 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.

0.25M

0.5M

0.75M

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

Show yearly numbers

Year	Customer-hours	Reported outages	Major outages
2015	165,162	110	0
2016	29,480	29	0
2017	257,699	95	4
2018	372,510	105	3
2019	288,585	116	2
2020	351,644	64	4
2021	893,368	97	4
2022	141,586	85	1
2023	892,639	72	1

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
Feb 22, 2023	71.8	36,109	848,162
Aug 11, 2021	33.5	30,959	608,543
Sep 25, 2018	28.5	24,431	219,018
Aug 10, 2020	12.5	18,037	161,388
Aug 12, 2021	39.2	13,522	143,045

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.