Frederick 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 |
|---|---|---|---|
| Dec 8, 2022 | <1 hr | 17,733 (13%) | Unnamed event |
| May 31, 2015 | 2 hrs | 9,606 (7%) | Thunderstorm Wind |
| Apr 9, 2016 | 2 hrs | 8,627 (7%) | Frost/Freeze |
| Dec 11, 2014 | 2 hrs | 8,526 (6%) | Winter Weather |
| Jun 18, 2015 | 1 hrs | 8,410 (6%) | Thunderstorm Wind |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Frederick County, Maryland that day.
Over the 12 years from 2014 to 2025, Frederick County recorded 1,256 distinct power outage events, averaging 2.5 hours per event.
The single worst outage on record in Frederick County started December 8, 2022, lasting less than 1 hour and leaving up to 17,733 customers without power (13% of the county) at its peak.
June has historically been the worst month for outages in Frederick County, with 146 events recorded during that month across the dataset.
Based on this history, Frederick County earns a Reliability Grade of B, placing it in the 74th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Maryland
Counties with the closest reliability grade and national percentile to Frederick County.
| County | Grade | National percentile |
|---|---|---|
| Somerset County | B | 74th |
| Calvert County | B | 76th |
| Washington County | B | 72nd |
| Montgomery County | B | 71st |
| Howard County | B | 78th |
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 Frederick County?
Between 2014 and 2025, Frederick County recorded 1,256 outage events, averaging 2.5 hours each.
What is Frederick County's reliability grade?
Frederick County has a Reliability Grade of B, in the 74th national percentile.
What was the worst power outage in Frederick County?
The worst outage on record started December 8, 2022, lasting less than 1 hour and affecting up to 17,733 customers.