Power outage history
Loudoun County Virginia
2.6hours
without power for the average customer in a typical year, 2018–2025
118th most of 123 in Virginia 61% below the national median
Every day since 2015
Eleven years, one night at a time
Each cell is a day. The brighter it is, the larger the share of Loudoun's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2018 was the worst well-recorded year, at 5.6 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Loudoun, hours without power per customer
The record
The biggest outages since 2015
Ranked by customer-hours lost: customers out multiplied by how long they stayed out. Times are local.
| Began | Storm | Peak out | Share | Lasted | 90% restored | Customer-hours |
|---|---|---|---|---|---|---|
| Mar 2, 2018 | Windstorm | 26,910 | 14% | 3.7 d | 2.6 d | 727k |
| Aug 7, 2023 | Thunderstorms | 22,509 | 12% | 23 h | 6.0 h | 83k |
| Apr 30, 2021 | No storm report | 9,688 | 5% | 19 h | 22 h | 69k |
| Dec 23, 2022 | Flooding | 8,686 | 5% | 9.5 h | 18 h | 43k |
| Jun 19, 2025 | Thunderstorms | 17,820 | 9% | 3.2 h | 1.0 h | 42k |
| Jun 22, 2022 | Thunderstorms | 5,748 | 3% | 15 h | 26 h | 40k |
| Jul 21, 2019 | Thunderstorms | 13,393 | 7% | 5.5 h | 30 min | 37k |
| Nov 16, 2018 | Winter storm | 4,127 | 2% | 14 h | – | 36k |
| Aug 3, 2024 | Thunderstorms | 7,636 | 4% | 8.0 h | 14 h | 34k |
| Aug 17, 2019 | No storm report | 6,349 | 3% | 11 h | 12 h | 34k |
| Feb 16, 2025 | Windstorm | 5,025 | 3% | 11 h | 23 h | 33k |
| Dec 11, 2021 | No storm report | 12,782 | 7% | 4.8 h | 4.8 h | 28k |
| May 27, 2024 | No storm report | 13,906 | 7% | 2.2 h | 1.5 h | 27k |
| Mar 29, 2016 | No storm report | 15,775 | 8% | 4.0 h | 4.2 h | 27k |
| Apr 1, 2023 | Windstorm | 5,448 | 3% | 5.2 h | 15 h | 21k |
| Feb 7, 2020 | Tornadoes | 6,864 | 4% | 8.5 h | 8.0 h | 20k |
| May 23, 2019 | Thunderstorms | 5,127 | 3% | 5.0 h | 6.5 h | 19k |
| Jul 12, 2022 | Thunderstorms | 6,041 | 3% | 3.8 h | 5.5 h | 19k |
| Jul 22, 2019 | Thunderstorms | 4,260 | 2% | 5.2 h | – | 19k |
| Mar 16, 2025 | No storm report | 6,326 | 3% | 5.5 h | 8.5 h | 18k |
| Apr 3, 2016 | Windstorm | 5,132 | 3% | 7.8 h | 48 min | 18k |
| Jul 15, 2024 | Thunderstorms | 7,940 | 4% | 4.5 h | 13 h | 17k |
| Oct 5, 2021 | No storm report | 6,394 | 3% | 4.8 h | 1.8 h | 17k |
| Jun 21, 2021 | Thunderstorms | 4,459 | 2% | 5.5 h | – | 17k |
| May 14, 2018 | Thunderstorms | 6,753 | 4% | 4.0 h | 14 h | 16k |
| Feb 28, 2024 | No storm report | 4,269 | 2% | 4.5 h | – | 16k |
| Feb 13, 2025 | No storm report | 11,068 | 6% | 5.0 h | 4.0 h | 16k |
| Oct 30, 2017 | No storm report | 4,585 | 2% | 4.2 h | – | 14k |
| Jun 4, 2020 | Thunderstorms | 5,316 | 3% | 3.2 h | 2.0 h | 14k |
| Jun 21, 2016 | Thunderstorms | 4,590 | 2% | 6.2 h | – | 14k |
After the peak
How fast the lights come back
Each line is one major outage, from its peak. The amber line is the typical path.
When it happens
The outage clock
Customer-hours out by month (rings, January innermost) and local hour, 2018–2025.
What was happening
Weather behind the outages
Each outage is matched to NOAA storm reports for Loudoun from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Windstorm 40%
- No storm on record 28%
- Thunderstorms 24%
- Winter storm 2.5%
- Flooding 2.3%
- Heat 1.0%
- Tornadoes 1.0%
- Tropical storm 0.9%
Who keeps the lights on
Utilities serving Loudoun
As each utility reports to the Energy Information Administration for its whole Virginia territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Virginia Electric & Power Co | Investor Owned | 307 | 144 | 1.78 | 15.2 | 2.4M |
| Northern Virginia Elec Coop | Cooperative | 94 | 43 | 0.98 | 12.6 | 169k |
EIA Form 861, latest year each utility reported. Outage minutes are SAIDI, the yearly minutes the average customer goes without power; outages a year are SAIFI.
Next door
Neighbouring counties
- Fauquier 14 h
- Clarke 6.3 h
- Jefferson, WV 4.5 h
- Fairfax 3.5 h
- Washington, MD 3.5 h
- Montgomery, MD 2.8 h
- Frederick, MD 2.6 h
- Loudoun (this county) 2.6 h
- Prince William 1.8 h
About these numbers
Notes
Outages come from the EAGLE-I record of utility outage maps collected every 15 minutes by Oak Ridge National Laboratory. Hours without power are customer-hours divided by the county's 187,874 electricity customers. Averages use well-covered years from 2018. Outages shorter than 15 minutes, and utilities that publish no outage map, are not in the record, so these figures understate the total. How every number is made →