County annual report · FIPS 24037
2025 St. Mary's County, MD Power Outage Report
In 2025, customers in St. Mary's County, MD went without power for an average of 3.9 hours, a total of 220K customer-hours (Maryland average 4.2 hours). That ranks 11th worst of 24 Maryland counties and 1792nd of 3,000 nationally.
Compared with MD, the US and 2024
Coverage line is EAGLE-I's share of Maryland customers tracked each year.
Biggest outages in St. Mary's County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | May 16, 2025 22:00 | May 18, 2025 07:15 | 1d 9h | 11,745 | 55K |
| 2 | December 19, 2025 17:15 | December 20, 2025 04:30 | 11h 15m | 7,689 | 4,591 |
| 3 | July 1, 2025 13:30 | July 3, 2025 03:30 | 1d 14h | 5,623 | 26K |
| 4 | November 29, 2025 05:15 | November 29, 2025 06:30 | 1h 15m | 5,033 | 4,967 |
| 5 | May 20, 2025 01:30 | May 20, 2025 09:45 | 8h 15m | 2,932 | 2,949 |
| 6 | March 16, 2025 23:00 | March 17, 2025 00:30 | 1h 30m | 2,704 | 3,307 |
| 7 | June 13, 2025 11:30 | June 14, 2025 14:45 | 1d 3h | 2,611 | 13K |
| 8 | September 16, 2025 16:15 | September 17, 2025 15:00 | 22h 45m | 1,810 | 7,495 |
| 9 | May 13, 2025 17:45 | May 14, 2025 11:30 | 17h 45m | 1,359 | 10K |
| 10 | June 22, 2025 15:15 | June 23, 2025 03:15 | 12h | 1,312 | 2,068 |
Outage episodes by size in 2025: 90 reached 100+ customers, 18 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 2025, 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 | 2024 | 2.4 hrs | 1.31 | 1.9 hrs | 1.13 |
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 2025; 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, 2025, 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/2025/maryland/st-marys-county