County annual report · FIPS 24037
2021 St. Mary's County, MD Power Outage Report
In 2021, customers in St. Mary's County, MD went without power for an average of 3.4 hours, a total of 193K customer-hours (Maryland average 2.5 hours). That ranks 4th worst of 24 Maryland counties and 1693rd of 2,974 nationally.
Compared with MD, the US and 2020
Coverage line is EAGLE-I's share of Maryland customers tracked each year.
Biggest outages in St. Mary's County, 2021
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 10, 2021 08:00 | August 10, 2021 09:00 | 1h | 9,252 | 7,818 |
| 2 | February 18, 2021 16:00 | February 20, 2021 03:45 | 1d 11h | 7,105 | 42K |
| 3 | August 13, 2021 23:15 | August 14, 2021 21:15 | 22h | 6,484 | 7,469 |
| 4 | December 12, 2021 11:00 | December 12, 2021 21:00 | 10h | 3,846 | 6,820 |
| 5 | April 11, 2021 03:15 | April 12, 2021 03:00 | 23h 45m | 3,209 | 5,220 |
| 6 | July 14, 2021 18:00 | July 15, 2021 20:45 | 1d 2h | 2,292 | 9,285 |
| 7 | August 27, 2021 23:15 | August 28, 2021 18:30 | 19h 15m | 2,211 | 3,768 |
| 8 | November 25, 2021 02:45 | November 25, 2021 05:45 | 3h | 1,786 | 3,309 |
| 9 | May 8, 2021 05:00 | May 8, 2021 20:15 | 15h 15m | 1,607 | 12K |
| 10 | August 7, 2021 23:45 | August 8, 2021 05:45 | 6h | 1,606 | 6,700 |
Outage episodes by size in 2021: 92 reached 100+ customers, 24 reached 1,000+ customers, 0 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 2021, 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 | 2021 | 2.7 hrs | 1.56 | 2.0 hrs | 1.30 |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 99% of Maryland's customers in 2021; 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, 2021, 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/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2021/maryland/st-marys-county