Johnson County, Iowa Power Outages, 2015 to 2023

Johnson County, Iowa had 9 major outages from 2015 to 2023

Above middle outage time among US counties

Residents here averaged 0.89 times the US outage time per person and 1.05 times the Iowa rate. It ranks 17 of 97 in the state, where 1 has the most. Data confidence: High, with 9 years of records.

1.0major outages per year

7 of 9years with a major outage

175 hrslongest major outage

Aug, Marhardest months

August and March made up 79% of this county's outage time. The largest outage on record began Aug 10, 2020, reached 51,777 customers, and left at least 200 customers out for 175.0 hours.

Outage time per resident, rated Iowa counties

MostLeast

Outage impact by year

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

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

Show yearly numbers

Year	Customer-hours	Reported outages	Major outages
2015	37,984	18	1
2016	86,338	41	1
2017	120,941	66	1
2018	108,249	56	1
2019	88,454	62	1
2020	2,392,613	81	2
2021	81,657	64	0
2022	76,892	68	0
2023	150,336	74	2

When outages hit

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

20%

40%

60%

80%

JanJFebFMarMAprAMayMJunJJulJAugASepSOctONovNDecD

Largest outages on record

Start date	Hours	Peak customers	Customer-hours
Aug 10, 2020	175.0	51,777	2,267,906
Mar 10, 2017	2.2	42,670	44,042
Mar 31, 2023	21.5	12,293	38,274
May 7, 2023	7.2	6,587	26,782
Jun 4, 2015	15.0	4,054	23,334

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.