Calvert County Power Outage History
2014–2025 · Maryland
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 |
|---|---|---|---|
| Jan 3, 2022 | 76 hrs | 12,581 (18%) | Winter Storm |
| Aug 4, 2020 | 35 hrs | 11,675 (16%) | Tropical Storm Isaias |
| May 16, 2025 | 32 hrs | 8,498 (12%) | Thunderstorm Wind |
| Jul 7, 2020 | 7 hrs | 8,457 (12%) | Unnamed event |
| Sep 15, 2021 | 2 hrs | 8,069 (11%) | Unnamed event |
Over the 12 years from 2014 to 2025, Calvert County recorded 599 distinct power outage events, averaging 2.1 hours per event.
The single worst outage on record in Calvert County started January 3, 2022 (Winter Storm), lasting 76 hours and leaving up to 12,581 customers without power (18% of the county) at its peak.
July has historically been the worst month for outages in Calvert County, with 73 events recorded during that month across the dataset.
Based on this history, Calvert County earns a Reliability Grade of B, placing it in the 76th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Calvert County's outage profile
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Similar counties in Maryland
Counties with the closest reliability grade and national percentile to Calvert County.
| County | Grade | National percentile |
|---|---|---|
| Frederick County | B | 74th |
| Howard County | B | 78th |
| Somerset County | B | 74th |
| Caroline County | B | 79th |
| Queen Anne's County | B | 79th |
FAQ
How often does power go out in Calvert County?
Between 2014 and 2025, Calvert County recorded 599 outage events, averaging 2.1 hours each.
What is Calvert County's reliability grade?
Calvert County has a Reliability Grade of B, in the 76th national percentile.
What was the worst power outage in Calvert County?
The worst outage on record started January 3, 2022 (Winter Storm), lasting 76 hours and affecting up to 12,581 customers.