Loudoun County Power Outage History
2015–2025 · Virginia
Better than average — fewer or shorter outages than most counties. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Mar 2, 2018 | 91 hrs | 26,910 (14%) | Dense Fog |
| Mar 30, 2016 | 5 hrs | 23,066 (12%) | Unnamed event |
| Aug 7, 2023 | 13 hrs | 22,969 (12%) | Thunderstorm Wind |
| Jun 19, 2025 | 26 hrs | 17,820 (9%) | Flash Flood |
| May 27, 2024 | 4 hrs | 13,906 (7%) | Thunderstorm Wind |
Over the 11 years from 2015 to 2025, Loudoun County recorded 1,224 distinct power outage events, averaging 2.7 hours per event.
The single worst outage on record in Loudoun County started March 2, 2018 (Dense Fog), lasting 91 hours and leaving up to 26,910 customers without power (14% of the county) at its peak.
July has historically been the worst month for outages in Loudoun County, with 164 events recorded during that month across the dataset.
Based on this history, Loudoun County earns a Reliability Grade of B, placing it in the 75th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Loudoun County's outage profile
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Similar counties in Virginia
Counties with the closest reliability grade and national percentile to Loudoun County.
| County | Grade | National percentile |
|---|---|---|
| Covington County | B | 75th |
| Fairfax County | B | 74th |
| Buena Vista County | B | 77th |
| Accomack County | B | 78th |
| Northampton County | B | 71st |
FAQ
How often does power go out in Loudoun County?
Between 2015 and 2025, Loudoun County recorded 1,224 outage events, averaging 2.7 hours each.
What is Loudoun County's reliability grade?
Loudoun County has a Reliability Grade of B, in the 75th national percentile.
What was the worst power outage in Loudoun County?
The worst outage on record started March 2, 2018 (Dense Fog), lasting 91 hours and affecting up to 26,910 customers.