McCook CountyPower Outage History
What this grade means
(How grades are calculated)Average — typical outage frequency and duration nationally. This county sits in the middle of the national distribution — its outage frequency and duration over the past 12 years are close to the nationwide median, neither notably better nor worse than most other US counties. A typical amount of backup-power preparedness is reasonable here.
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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for McCook County, South Dakota that day.
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).
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 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.