County annual report · FIPS 24009
2021 Calvert County, MD Power Outage Report
In 2021, customers in Calvert County, MD went without power for an average of 3.2 hours, a total of 127K customer-hours (Maryland average 2.5 hours). That ranks 5th worst of 24 Maryland counties and 1770th 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 Calvert 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 | September 15, 2021 00:45 | September 15, 2021 19:15 | 18h 30m | 8,069 | 12K |
| 2 | April 21, 2021 17:45 | April 22, 2021 00:30 | 6h 45m | 4,525 | 13K |
| 3 | July 9, 2021 21:15 | July 10, 2021 15:45 | 18h 30m | 3,978 | 14K |
| 4 | February 19, 2021 10:00 | February 20, 2021 03:45 | 17h 45m | 3,589 | 15K |
| 5 | August 13, 2021 22:45 | August 15, 2021 12:30 | 1d 13h | 3,089 | 7,034 |
| 6 | July 14, 2021 22:15 | July 17, 2021 06:30 | 2d 8h | 2,369 | 1,788 |
| 7 | June 8, 2021 21:15 | June 9, 2021 09:45 | 12h 30m | 1,605 | 2,646 |
| 8 | October 29, 2021 09:30 | October 31, 2021 03:45 | 1d 18h | 1,334 | 3,587 |
| 9 | January 11, 2021 00:00 | January 11, 2021 09:15 | 9h 15m | 1,239 | 985 |
| 10 | September 3, 2021 23:15 | September 4, 2021 03:15 | 4h | 1,121 | 1,124 |
Outage episodes by size in 2021: 59 reached 100+ customers, 11 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 Calvert 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 |
|---|---|---|---|---|---|
| Baltimore Gas & Electric Co | 2021 | 2.4 hrs | 1.02 | 77 min | 0.77 |
| 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 ÷ 39,458 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. Calvert County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Calvert 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/calvert-county