Clark 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 |
|---|---|---|---|
| Dec 16, 2021 | 45 hrs | 4,358 (24%) | Winter Storm |
| May 11, 2022 | <1 hr | 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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Clark County, Wisconsin that day.
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).
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 |
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 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.