Harford County Power Outage History
2014–2025 · Maryland
Average — typical outage frequency and duration nationally. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Mar 2, 2018 | 26 hrs | 45,995 (40%) | Dense Fog |
| Jul 12, 2022 | 116 hrs | 31,551 (27%) | Thunderstorm Wind |
| Jul 28, 2023 | 47 hrs | 30,600 (27%) | Excessive Heat |
| Aug 7, 2023 | 13 hrs | 17,771 (15%) | Thunderstorm Wind |
| Mar 4, 2018 | 2 hrs | 16,874 (15%) | Dense Fog |
Over the 12 years from 2014 to 2025, Harford County recorded 1,093 distinct power outage events, averaging 2.6 hours per event.
The single worst outage on record in Harford County started March 2, 2018 (Dense Fog), lasting 26 hours and leaving up to 45,995 customers without power (40% of the county) at its peak.
July has historically been the worst month for outages in Harford County, with 184 events recorded during that month across the dataset.
Based on this history, Harford County earns a Reliability Grade of C, placing it in the 56th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Harford County's outage profile
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Similar counties in Maryland
Counties with the closest reliability grade and national percentile to Harford County.
| County | Grade | National percentile |
|---|---|---|
| Baltimore County | C | 58th |
| Cecil County | C | 51st |
| Carroll County | C | 49th |
| Baltimore County | B | 65th |
| Prince George's County | B | 67th |
FAQ
How often does power go out in Harford County?
Between 2014 and 2025, Harford County recorded 1,093 outage events, averaging 2.6 hours each.
What is Harford County's reliability grade?
Harford County has a Reliability Grade of C, in the 56th national percentile.
What was the worst power outage in Harford County?
The worst outage on record started March 2, 2018 (Dense Fog), lasting 26 hours and affecting up to 45,995 customers.