Clark County Power Outage History
2015–2025 · Wisconsin
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 |
|---|---|---|---|
| Dec 16, 2021 | 45 hrs | 4,358 (24%) | Winter Storm |
| May 11, 2022 | 1 hrs | 3,536 (20%) | Unnamed event |
| May 22, 2024 | 25 hrs | 2,939 (16%) | Hail |
| May 15, 2025 | 13 hrs | 2,505 (14%) | Hail |
| Jul 20, 2019 | 21 hrs | 2,458 (14%) | Thunderstorm Wind |
Over the 11 years from 2015 to 2025, Clark County recorded 177 distinct power outage events, averaging 3.0 hours per event.
The single worst outage on record in Clark County started December 16, 2021 (Winter Storm), lasting 45 hours and leaving up to 4,358 customers without power (24% of the county) at its peak.
August has historically been the worst month for outages in Clark County, with 35 events recorded during that month across the dataset.
Based on this history, Clark County earns a Reliability Grade of B, placing it in the 78th 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 Wisconsin
Counties with the closest reliability grade and national percentile to Clark County.
| County | Grade | National percentile |
|---|---|---|
| Winnebago County | B | 77th |
| Grant County | B | 79th |
| Brown County | B | 79th |
| Lafayette County | B | 79th |
| Adams County | B | 76th |
FAQ
How often does power go out in Clark County?
Between 2015 and 2025, Clark County recorded 177 outage events, averaging 3.0 hours each.
What is Clark County's reliability grade?
Clark County has a Reliability Grade of B, in the 78th national percentile.
What was the worst power outage in Clark County?
The worst outage on record started December 16, 2021 (Winter Storm), lasting 45 hours and affecting up to 4,358 customers.