County annual report · FIPS 24037
2018 St. Mary's County, MD Power Outage Report
In 2018, customers in St. Mary's County, MD went without power for an average of 7.1 hours, a total of 397K customer-hours (Maryland average 5.5 hours). That ranks 3rd worst of 23 Maryland counties and 763rd of 2,798 nationally.
Compared with MD, the US and 2017
Coverage line is EAGLE-I's share of Maryland customers tracked each year.
Biggest outages in St. Mary's County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | March 2, 2018 06:45 | March 5, 2018 22:45 | 3d 16h | 11,852 | 188K |
| 2 | October 11, 2018 22:30 | October 13, 2018 22:45 | 2d | 9,464 | 81K |
| 3 | August 11, 2018 10:00 | August 11, 2018 17:00 | 7h | 2,780 | 4,725 |
| 4 | April 3, 2018 13:00 | April 4, 2018 00:15 | 11h 15m | 2,635 | 3,489 |
| 5 | July 22, 2018 12:00 | July 22, 2018 23:15 | 11h 15m | 2,630 | 2,522 |
| 6 | April 13, 2018 12:00 | April 13, 2018 19:15 | 7h 15m | 2,552 | 1,753 |
| 7 | May 18, 2018 15:45 | May 19, 2018 09:15 | 17h 30m | 2,529 | 2,714 |
| 8 | August 21, 2018 20:30 | August 22, 2018 09:45 | 13h 15m | 2,143 | 7,432 |
| 9 | July 30, 2018 23:45 | July 31, 2018 04:00 | 4h 15m | 1,390 | 1,742 |
| 10 | June 2, 2018 05:45 | June 2, 2018 17:45 | 12h | 1,278 | 4,261 |
Outage episodes by size in 2018: 96 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 2018, 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 2018; 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, 2018, 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/2018/maryland/st-marys-county