County annual report · FIPS 24037
2020 St. Mary's County, MD Power Outage Report
In 2020, customers in St. Mary's County, MD went without power for an average of 4.3 hours, a total of 239K customer-hours (Maryland average 2.2 hours). That ranks 4th worst of 24 Maryland counties and 1548th of 3,019 nationally.
Compared with MD, the US and 2019
Coverage line is EAGLE-I's share of Maryland customers tracked each year.
Biggest outages in St. Mary's County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 4, 2020 04:00 | August 6, 2020 04:45 | 2d | 10,173 | 95K |
| 2 | February 7, 2020 13:15 | February 8, 2020 02:45 | 13h 30m | 3,509 | 12K |
| 3 | September 10, 2020 11:45 | September 11, 2020 09:45 | 22h | 2,650 | 2,043 |
| 4 | December 12, 2020 06:45 | December 12, 2020 15:00 | 8h 15m | 2,432 | 3,177 |
| 5 | April 13, 2020 08:30 | April 14, 2020 00:45 | 16h 15m | 2,373 | 7,046 |
| 6 | August 3, 2020 19:30 | August 4, 2020 03:00 | 7h 30m | 2,193 | 2,684 |
| 7 | November 2, 2020 01:30 | November 2, 2020 20:45 | 19h 15m | 2,185 | 4,138 |
| 8 | April 29, 2020 22:15 | April 30, 2020 07:30 | 9h 15m | 1,684 | 2,506 |
| 9 | August 20, 2020 12:15 | August 21, 2020 00:15 | 12h | 1,655 | 5,944 |
| 10 | July 7, 2020 02:30 | July 7, 2020 23:45 | 21h 15m | 1,502 | 5,518 |
Outage episodes by size in 2020: 79 reached 100+ customers, 17 reached 1,000+ customers, 1 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving St. Mary's County reported on EIA Form 861 for 2020, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| Southern Maryland Elec Coop Inc | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 98% of Maryland's customers in 2020; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 55,898 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. St. Mary's County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), St. Mary's County, MD annual power outage report, 2020, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/). https://massoutage.com/reports/2020/maryland/st-marys-county