County annual report · FIPS 24037
2023 St. Mary's County, MD Power Outage Report
In 2023, customers in St. Mary's County, MD went without power for an average of 3.4 hours, a total of 192K customer-hours (Maryland average 3.6 hours). That ranks 8th worst of 24 Maryland counties and 1823rd of 2,977 nationally.
Compared with MD, the US and 2022
Coverage line is EAGLE-I's share of Maryland customers tracked each year.
Biggest outages in St. Mary's County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | July 29, 2023 22:15 | July 31, 2023 07:00 | 1d 8h | 6,238 | 46K |
| 2 | September 23, 2023 01:15 | September 24, 2023 02:45 | 1d 1h | 4,956 | 18K |
| 3 | September 12, 2023 09:30 | September 12, 2023 18:15 | 8h 45m | 4,398 | 2,296 |
| 4 | September 16, 2023 08:15 | September 16, 2023 09:15 | 1h | 4,269 | 3,297 |
| 5 | March 11, 2023 06:45 | March 11, 2023 14:45 | 8h | 3,034 | 6,487 |
| 6 | May 4, 2023 12:00 | May 4, 2023 14:30 | 2h 30m | 2,596 | 677 |
| 7 | April 1, 2023 14:00 | April 1, 2023 20:00 | 6h | 2,593 | 13K |
| 8 | September 20, 2023 12:15 | September 21, 2023 00:45 | 12h 30m | 2,057 | 1,127 |
| 9 | April 29, 2023 11:00 | April 29, 2023 16:45 | 5h 45m | 1,816 | 3,277 |
| 10 | May 15, 2023 07:15 | May 15, 2023 11:30 | 4h 15m | 1,793 | 2,120 |
Outage episodes by size in 2023: 77 reached 100+ customers, 21 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 2023, 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 | 2023 | 3.4 hrs | 1.33 | 1.7 hrs | 1.09 |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about n/a of Maryland's customers in 2023; 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, 2023, 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/2023/maryland/st-marys-county