Nassau County, New York Power Outages, 2015 to 2023

Nassau County, New York had 4 major outages from 2015 to 2023

Below middle outage time among US counties

Residents here averaged 0.64 times the US outage time per person and 1.04 times the New York rate. It ranks 46 of 61 in the state, where 1 has the most. Data confidence: High, with 9 years of records.

0.4major outages per year

3 of 9years with a major outage

240 hrslongest major outage

Aug, Marhardest months

August and March made up 77% of this county's outage time. The largest outage on record began Aug 4, 2020, reached 141,608 customers, and left at least 200 customers out for 240.5 hours.

Outage time per resident, rated New York 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	245,324	421	0
2016	1,205,886	639	1
2017	990,255	548	0
2018	1,586,729	468	2
2019	638,473	356	0
2020	13,852,735	366	1
2021	353,112	386	0
2022	358,021	350	0
2023	367,029	435	0

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 4, 2020	240.5	141,608	13,260,110
Mar 2, 2018	79.0	45,945	731,342
Mar 7, 2018	53.0	18,528	313,727
Feb 25, 2016	49.8	32,589	309,224
Jul 12, 2017	59.8	7,057	230,949

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.