McCook CountyPower Outage History
2015–2025 · South Dakota
Average — typical outage frequency and duration nationally.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| May 12, 2022 | 72 hrs | 1,889 (49%) | Hail |
| Jun 12, 2025 | 3 hrs | 1,715 (44%) | Unnamed event |
| May 30, 2022 | 30 hrs | 1,281 (33%) | Thunderstorm Wind |
| May 21, 2024 | 7 hrs | 1,234 (32%) | High Wind |
| Dec 26, 2024 | <1 hr | 1,183 (30%) | Strong Wind |
Over the 11 years from 2015 to 2025, McCook County recorded 242 distinct power outage events, averaging 5.9 hours per event.
The single worst outage on record in McCook County started May 12, 2022 (Hail), lasting 72 hours and leaving up to 1,889 customers without power (49% of the county) at its peak.
September has historically been the worst month for outages in McCook County, with 34 events recorded during that month across the dataset.
Based on this history, McCook County earns a Reliability Grade of C, placing it in the 43rd percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in South Dakota
Counties with the closest reliability grade and national percentile to McCook County.
| County | Grade | National percentile |
|---|---|---|
| Hamlin County | C | 47th |
| Marshall County | D | 37th |
| Sanborn County | C | 49th |
| Miner County | C | 53rd |
| Moody County | C | 54th |
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 McCook County?
Between 2015 and 2025, McCook County recorded 242 outage events, averaging 5.9 hours each.
What is McCook County's reliability grade?
McCook County has a Reliability Grade of C, in the 43rd national percentile.
What was the worst power outage in McCook County?
The worst outage on record started May 12, 2022 (Hail), lasting 72 hours and affecting up to 1,889 customers.