Mercer 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 |
|---|---|---|---|
| Feb 24, 2019 | 20 hrs | 8,809 (41%) | Winter Weather |
| Apr 3, 2025 | 20 hrs | 6,108 (29%) | Hail |
| Jan 18, 2020 | 3 hrs | 6,047 (28%) | Unnamed event |
| Mar 20, 2025 | 2 hrs | 4,658 (22%) | Unnamed event |
| Jun 18, 2021 | 18 hrs | 4,516 (21%) | Tornado |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Mercer County, Ohio that day.
Over the 12 years from 2014 to 2025, Mercer County recorded 319 distinct power outage events, averaging 2.0 hours per event.
The single worst outage on record in Mercer County started February 24, 2019 (Winter Weather), lasting 20 hours and leaving up to 8,809 customers without power (41% of the county) at its peak.
March has historically been the worst month for outages in Mercer County, with 46 events recorded during that month across the dataset.
Based on this history, Mercer County earns a Reliability Grade of B, placing it in the 76th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Ohio
Counties with the closest reliability grade and national percentile to Mercer County.
| County | Grade | National percentile |
|---|---|---|
| Wyandot County | B | 76th |
| Crawford County | B | 77th |
| Lucas County | B | 74th |
| Miami County | B | 74th |
| Putnam County | B | 79th |
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 Mercer County?
Between 2014 and 2025, Mercer County recorded 319 outage events, averaging 2.0 hours each.
What is Mercer County's reliability grade?
Mercer County has a Reliability Grade of B, in the 76th national percentile.
What was the worst power outage in Mercer County?
The worst outage on record started February 24, 2019 (Winter Weather), lasting 20 hours and affecting up to 8,809 customers.