Marshall CountyPower Outage History
2019–2025 · South Dakota
Worse than average — more frequent or longer outages than most counties.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jul 27, 2023 | 7 hrs | 872 (20%) | Unnamed event |
| Apr 19, 2023 | 3 hrs | 839 (19%) | Flood |
| Aug 21, 2020 | 3 hrs | 834 (19%) | Tornado |
| Aug 25, 2020 | 5 hrs | 833 (19%) | Tornado |
| Apr 8, 2024 | 9 hrs | 827 (19%) | High Wind |
Over the 7 years from 2019 to 2025, Marshall County recorded 299 distinct power outage events, averaging 5.4 hours per event.
The single worst outage on record in Marshall County started July 27, 2023, lasting 7 hours and leaving up to 872 customers without power (20% of the county) at its peak.
August has historically been the worst month for outages in Marshall County, with 47 events recorded during that month across the dataset.
Based on this history, Marshall County earns a Reliability Grade of D, placing it in the 37th 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 Marshall County.
| County | Grade | National percentile |
|---|---|---|
| McCook County | C | 43rd |
| Grant County | D | 31st |
| Custer County | D | 30th |
| Perkins County | D | 29th |
| Hamlin County | C | 47th |
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 Marshall County?
Between 2019 and 2025, Marshall County recorded 299 outage events, averaging 5.4 hours each.
What is Marshall County's reliability grade?
Marshall County has a Reliability Grade of D, in the 37th national percentile.
What was the worst power outage in Marshall County?
The worst outage on record started July 27, 2023, lasting 7 hours and affecting up to 872 customers.