Hanson CountyPower Outage History
2015–2025 · 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 |
|---|---|---|---|
| Dec 24, 2022 | 4 hrs | 1,477 (50%) | Drought |
| Jul 29, 2025 | 2 hrs | 848 (29%) | Heat |
| Jul 20, 2019 | 9 hrs | 824 (28%) | Flood |
| Jul 29, 2025 | 1 hrs | 798 (27%) | Heat |
| May 12, 2022 | 28 hrs | 786 (26%) | Drought |
Over the 11 years from 2015 to 2025, Hanson County recorded 153 distinct power outage events, averaging 3.7 hours per event.
The single worst outage on record in Hanson County started December 24, 2022 (Drought), lasting 4 hours and leaving up to 1,477 customers without power (50% of the county) at its peak.
June has historically been the worst month for outages in Hanson County, with 27 events recorded during that month across the dataset.
Based on this history, Hanson County earns a Reliability Grade of B, placing it in the 65th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Hanson County's outage profile
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Read our mission →Similar counties in South Dakota
Counties with the closest reliability grade and national percentile to Hanson County.
| County | Grade | National percentile |
|---|---|---|
| Lake County | B | 65th |
| Day County | B | 65th |
| Fall River County | B | 65th |
| Yankton County | B | 65th |
| Turner County | B | 64th |
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 Hanson County?
Between 2015 and 2025, Hanson County recorded 153 outage events, averaging 3.7 hours each.
What is Hanson County's reliability grade?
Hanson County has a Reliability Grade of B, in the 65th national percentile.
What was the worst power outage in Hanson County?
The worst outage on record started December 24, 2022 (Drought), lasting 4 hours and affecting up to 1,477 customers.