Loudoun CountyPower Outage History
What this grade means
Better than average — fewer or shorter outages than most counties. This county's outage history is better than the national median: recorded outages are less frequent and/or shorter in duration than a typical US county experienced over the same 12-year period. It isn't in the top tier nationally, but its track record points to lower-than-average outage risk.
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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Loudoun County, Virginia that day.
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).
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 |
Most reliable counties nationally
The top 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | South Dakota | A | 100th |
| Clearwater County | Minnesota | A | 99th |
| Limestone County | Alabama | A | 99th |
Least reliable counties nationally
The bottom 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | West Virginia | F | 0th |
| Lincoln County | West Virginia | F | 0th |
| Cameron Parish | Louisiana | F | 0th |
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.