County annual report · FIPS 51107
2021 Loudoun County, VA Power Outage Report
In 2021, customers in Loudoun County, VA went without power for an average of 2.2 hours, a total of 407K customer-hours (Virginia average 8.7 hours). That ranks 111th worst of 130 Virginia counties and 2160th of 2,974 nationally.
Compared with VA, the US and 2020
Coverage line is EAGLE-I's share of Virginia customers tracked each year.
Biggest outages in Loudoun 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 | December 12, 2021 01:15 | December 12, 2021 16:15 | 15h | 12,782 | 31K |
| 2 | April 25, 2021 07:30 | April 25, 2021 22:00 | 14h 30m | 10,134 | 6,347 |
| 3 | April 30, 2021 04:00 | May 2, 2021 04:30 | 2d | 9,688 | 80K |
| 4 | October 26, 2021 00:00 | October 27, 2021 20:45 | 1d 20h | 8,953 | 7,333 |
| 5 | June 30, 2021 13:15 | July 2, 2021 23:30 | 2d 10h | 8,174 | 13K |
| 6 | July 7, 2021 22:00 | July 10, 2021 21:30 | 2d 23h | 6,932 | 12K |
| 7 | October 5, 2021 21:45 | October 6, 2021 01:30 | 3h 45m | 6,394 | 13K |
| 8 | October 6, 2021 02:15 | October 6, 2021 07:30 | 5h 15m | 6,127 | 5,417 |
| 9 | September 7, 2021 12:30 | September 7, 2021 21:30 | 9h | 5,444 | 8,171 |
| 10 | November 16, 2021 06:30 | November 16, 2021 19:00 | 12h 30m | 5,186 | 8,023 |
Outage episodes by size in 2021: 120 reached 100+ customers, 34 reached 1,000+ customers, 2 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 Loudoun 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 |
|---|---|---|---|---|---|
| Northern Virginia Elec Coop | 2016 | 46 min | 0.64 | 46 min | 0.64 |
| Virginia Electric & Power 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 97% of Virginia's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 187,874 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. Loudoun County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Loudoun County, VA 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/virginia/loudoun-county