St. Mary's County, Maryland Power Outages, 2015 to 2023

St. Mary's County, Maryland had 16 major outages from 2015 to 2023

Below middle outage time among US counties

Residents here averaged 0.61 times the US outage time per person and 1.55 times the Maryland rate. It ranks 6 of 24 in the state, where 1 has the most. Data confidence: High, with 9 years of records.

1.8major outages per year

9 of 9years with a major outage

62 hrslongest major outage

Jan, Marhardest months

January and March made up 33% of this county's outage time. The largest outage on record began Jan 3, 2022, reached 14,054 customers, and left at least 200 customers out for 62.5 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.

100K

200K

300K

400K

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

Show yearly numbers

Year	Customer-hours	Reported outages	Major outages
2015	105,195	59	2
2016	59,276	52	1
2017	84,647	66	1
2018	343,503	79	2
2019	91,988	74	1
2020	192,512	62	3
2021	146,146	75	2
2022	384,342	74	2
2023	149,993	73	2

When outages hit

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

10%

15%

20%

JanJFebFMarMAprAMayMJunJJulJAugASepSOctONovNDecD

Largest outages on record

Start date	Hours	Peak customers	Customer-hours
Jan 3, 2022	62.5	14,054	241,296
Mar 2, 2018	55.5	11,852	185,474
Aug 4, 2020	30.5	10,173	93,412
Oct 12, 2018	25.5	9,464	80,140
Jul 29, 2023	21.8	6,238	45,820

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

Counties ranked nearby

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.