Contra Costa County, California Power Outages, 2017 to 2023

Contra Costa County, California had 15 major outages from 2017 to 2023

Below middle outage time among US counties

Residents here averaged 0.59 times the US outage time per person and 0.66 times the California rate. It ranks 36 of 55 in the state, where 1 has the most. Data confidence: High, with 7 years of records.

2.1major outages per year

6 of 7years with a major outage

66 hrslongest major outage

Oct, Marhardest months

October and March made up 45% of this county's outage time. The largest outage on record began Mar 15, 2023, reached 42,459 customers, and left at least 200 customers out for 40.5 hours.

Outage time per resident, rated California counties

MostLeast

Outage impact by year

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

2017'172018'182019'192020'202021'212022'222023'23

Show yearly numbers

Year	Customer-hours	Reported outages	Major outages
2017	59	1	0
2018	549,042	344	1
2019	3,126,071	506	2
2020	1,487,170	537	2
2021	1,833,537	557	3
2022	1,346,929	554	1
2023	3,567,939	524	6

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
Mar 15, 2023	40.5	42,459	596,589
Mar 21, 2023	21.5	48,236	407,379
Mar 14, 2023	7.8	80,988	391,682
Oct 28, 2019	6.8	48,920	324,077
Oct 27, 2020	23.8	17,532	269,387

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.