Hamlin CountyPower Outage History
2019–2025 · 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 | 50 hrs | 2,092 (51%) | Hail |
| Aug 28, 2020 | 8 hrs | 1,049 (25%) | Thunderstorm Wind |
| Jun 28, 2025 | 3 hrs | 930 (23%) | Excessive Heat |
| Oct 29, 2024 | <1 hr | 913 (22%) | Drought |
| Aug 26, 2021 | 3 hrs | 741 (18%) | Drought |
Over the 7 years from 2019 to 2025, Hamlin County recorded 352 distinct power outage events, averaging 3.2 hours per event.
The single worst outage on record in Hamlin County started May 12, 2022 (Hail), lasting 50 hours and leaving up to 2,092 customers without power (51% of the county) at its peak.
August has historically been the worst month for outages in Hamlin County, with 53 events recorded during that month across the dataset.
Based on this history, Hamlin County earns a Reliability Grade of C, placing it in the 47th 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 Hamlin County.
| County | Grade | National percentile |
|---|---|---|
| Sanborn County | C | 49th |
| McCook County | C | 43rd |
| Miner County | C | 53rd |
| Moody County | C | 54th |
| Marshall County | D | 37th |
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 Hamlin County?
Between 2019 and 2025, Hamlin County recorded 352 outage events, averaging 3.2 hours each.
What is Hamlin County's reliability grade?
Hamlin County has a Reliability Grade of C, in the 47th national percentile.
What was the worst power outage in Hamlin County?
The worst outage on record started May 12, 2022 (Hail), lasting 50 hours and affecting up to 2,092 customers.