Edmunds CountyPower Outage History
2017–2025 · South Dakota
Top 20% most reliable nationally — infrequent, short outages. This county ranks in the most reliable fifth of all US counties in our dataset, based on 12 years of real DOE outage records: outages happen less often here, and when they do occur they tend to be resolved quickly compared to the rest of the country. Baseline outage risk is low, though a severe local storm can still occasionally cause a longer-than-usual outage regardless of the long-term track record.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Feb 3, 2021 | <1 hr | 1,188 (31%) | Freezing Fog |
| Feb 4, 2021 | 5 hrs | 1,177 (31%) | Freezing Fog |
| Feb 3, 2021 | <1 hr | 1,167 (31%) | Freezing Fog |
| Oct 14, 2021 | <1 hr | 687 (18%) | Drought |
| Jun 4, 2017 | 4 hrs | 549 (14%) | Thunderstorm Wind |
Over the 9 years from 2017 to 2025, Edmunds County recorded 98 distinct power outage events, averaging 2.1 hours per event.
The single worst outage on record in Edmunds County started February 3, 2021 (Freezing Fog), lasting less than 1 hour and leaving up to 1,188 customers without power (31% of the county) at its peak.
July has historically been the worst month for outages in Edmunds County, with 14 events recorded during that month across the dataset.
Based on this history, Edmunds County earns a Reliability Grade of A, placing it in the 93rd percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Edmunds 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 Edmunds County.
| County | Grade | National percentile |
|---|---|---|
| Stanley County | A | 93rd |
| Lincoln County | A | 92nd |
| Campbell County | A | 93rd |
| Mellette County | A | 92nd |
| Walworth County | A | 94th |
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 Edmunds County?
Between 2017 and 2025, Edmunds County recorded 98 outage events, averaging 2.1 hours each.
What is Edmunds County's reliability grade?
Edmunds County has a Reliability Grade of A, in the 93rd national percentile.
What was the worst power outage in Edmunds County?
The worst outage on record started February 3, 2021 (Freezing Fog), lasting less than 1 hour and affecting up to 1,188 customers.