Montgomery County, Maryland Power Outages, 2015 to 2023

Montgomery County, Maryland had 11 major outages from 2015 to 2023

Lower outage time among US counties

Residents here averaged 0.34 times the US outage time per person and 0.86 times the Maryland rate. It ranks 17 of 24 in the state, where 1 has the most. Data confidence: High, with 9 years of records.

1.2major outages per year

6 of 9years with a major outage

91 hrslongest major outage

Mar, Julhardest months

March and July made up 48% of this county's outage time. The largest outage on record began Mar 2, 2018, reached 108,677 customers, and left at least 200 customers out for 91.0 hours.

Outage time per resident, rated Maryland 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	605,042	304	1
2016	708,718	340	0
2017	387,730	271	0
2018	2,299,956	362	1
2019	575,328	345	2
2020	379,849	292	0
2021	591,831	276	2
2022	1,489,969	301	4
2023	1,011,773	258	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
Mar 2, 2018	91.0	108,677	1,939,499
Jul 28, 2023	85.0	55,999	700,002
Nov 27, 2022	11.0	120,582	537,606
Dec 23, 2022	41.2	19,429	194,344
Jun 23, 2015	20.8	20,436	193,296

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.

Look up another county

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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.