Harford CountyPower Outage History
What this grade means
Average — typical outage frequency and duration nationally. This county sits in the middle of the national distribution — its outage frequency and duration over the past 12 years are close to the nationwide median, neither notably better nor worse than most other US counties. A typical amount of backup-power preparedness is reasonable here.
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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Harford County, Maryland that day.
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).
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 |
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 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.