Clark CountyPower Outage History
2020–2025 · South Dakota
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 |
|---|---|---|---|
| Jun 11, 2025 | 3 hrs | 1,953 (84%) | Unnamed event |
| Apr 14, 2025 | 2 hrs | 1,339 (57%) | Drought |
| Dec 10, 2025 | 3 hrs | 1,283 (55%) | High Wind |
| Dec 14, 2022 | 10 hrs | 831 (36%) | Ice Storm |
| May 13, 2022 | 7 hrs | 676 (29%) | Hail |
Over the 6 years from 2020 to 2025, Clark County recorded 109 distinct power outage events, averaging 5.0 hours per event.
The single worst outage on record in Clark County started June 11, 2025, lasting 3 hours and leaving up to 1,953 customers without power (84% of the county) at its peak.
December has historically been the worst month for outages in Clark County, with 21 events recorded during that month across the dataset.
Based on this history, Clark County earns a Reliability Grade of B, placing it in the 69th 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.
No ads. No data selling. This site runs entirely on Amazon affiliate commissions — buying through our links costs you nothing extra and keeps it free for everyone.
Read our mission →Similar counties in South Dakota
Counties with the closest reliability grade and national percentile to Clark County.
| County | Grade | National percentile |
|---|---|---|
| Jackson County | B | 69th |
| McPherson County | B | 69th |
| Kingsbury County | B | 69th |
| Yankton County | B | 65th |
| Fall River County | B | 65th |
Most reliable counties in South Dakota
The top 3 counties in South Dakota by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Clay County | A | 100th |
| Codington County | A | 98th |
| Tripp County | A | 98th |
Least reliable counties in South Dakota
The bottom 3 counties in South Dakota by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Harding County | D | 21st |
| Perkins County | D | 29th |
| Custer County | D | 30th |
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 2020 and 2025, Clark County recorded 109 outage events, averaging 5.0 hours each.
What is Clark County's reliability grade?
Clark County has a Reliability Grade of B, in the 69th national percentile.
What was the worst power outage in Clark County?
The worst outage on record started June 11, 2025, lasting 3 hours and affecting up to 1,953 customers.