County annual report · FIPS 24021
2021 Frederick County, MD Power Outage Report
In 2021, customers in Frederick County, MD went without power for an average of 2.5 hours, a total of 335K customer-hours (Maryland average 2.5 hours). That ranks 12th worst of 24 Maryland counties and 2022nd 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 Frederick 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 | May 26, 2021 23:30 | May 28, 2021 04:45 | 1d 5h | 7,247 | 33K |
| 2 | May 2, 2021 23:30 | May 3, 2021 02:30 | 3h | 5,492 | 9,928 |
| 3 | May 3, 2021 08:15 | May 3, 2021 08:45 | 30m | 5,488 | 2,744 |
| 4 | April 30, 2021 11:30 | May 2, 2021 00:30 | 1d 13h | 5,128 | 28K |
| 5 | August 10, 2021 18:00 | August 13, 2021 17:00 | 2d 23h | 5,011 | 20K |
| 6 | April 18, 2021 14:45 | April 19, 2021 01:30 | 10h 45m | 4,493 | 16K |
| 7 | November 2, 2021 12:30 | November 2, 2021 21:30 | 9h | 3,726 | 2,155 |
| 8 | September 1, 2021 10:00 | September 3, 2021 23:00 | 2d 13h | 3,368 | 24K |
| 9 | May 3, 2021 22:00 | May 4, 2021 16:15 | 18h 15m | 2,794 | 4,624 |
| 10 | March 26, 2021 10:00 | March 27, 2021 03:00 | 17h | 2,464 | 2,435 |
Outage episodes by size in 2021: 128 reached 100+ customers, 27 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 Frederick 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 |
|---|---|---|---|---|---|
| The Potomac Edison Company | 2021 | 3.3 hrs | 1.26 | 2.9 hrs | 1.20 |
| Thurmont Municipal Light Co | - | - | - | - | - |
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 ÷ 132,173 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. Frederick County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Frederick 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/frederick-county