Clark County Power Outage History
2014–2025 · Ohio
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 |
|---|---|---|---|
| Jun 18, 2025 | 68 hrs | 17,465 (21%) | Thunderstorm Wind |
| May 20, 2022 | 2 hrs | 16,019 (19%) | Unnamed event |
| Apr 2, 2016 | 5 hrs | 12,614 (15%) | High Wind |
| Oct 11, 2021 | 4 hrs | 9,468 (11%) | Unnamed event |
| Aug 17, 2018 | 5 hrs | 9,047 (11%) | Unnamed event |
Over the 12 years from 2014 to 2025, Clark County recorded 609 distinct power outage events, averaging 2.3 hours per event.
The single worst outage on record in Clark County started June 18, 2025 (Thunderstorm Wind), lasting 68 hours and leaving up to 17,465 customers without power (21% of the county) at its peak.
July has historically been the worst month for outages in Clark County, with 76 events recorded during that month across the dataset.
Based on this history, Clark County earns a Reliability Grade of B, placing it in the 80th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Clark County's outage profile
See more picks in our Best Small Power Stations (Under 1,000Wh) roundup.
Outage-prep kit
See our outage-prep guides.
Similar counties in Ohio
Counties with the closest reliability grade and national percentile to Clark County.
| County | Grade | National percentile |
|---|---|---|
| Sandusky County | A | 81st |
| Putnam County | B | 79th |
| Crawford County | B | 77th |
| Mercer County | B | 76th |
| Marion County | A | 84th |
FAQ
How often does power go out in Clark County?
Between 2014 and 2025, Clark County recorded 609 outage events, averaging 2.3 hours each.
What is Clark County's reliability grade?
Clark County has a Reliability Grade of B, in the 80th national percentile.
What was the worst power outage in Clark County?
The worst outage on record started June 18, 2025 (Thunderstorm Wind), lasting 68 hours and affecting up to 17,465 customers.