Ziebach CountyPower Outage History
2018–2025 · 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 |
|---|---|---|---|
| Nov 14, 2025 | 2 hrs | 1,571 (56%) | Unnamed event |
| Sep 3, 2025 | 3 hrs | 1,569 (56%) | Unnamed event |
| Nov 25, 2025 | 2 hrs | 1,566 (56%) | Unnamed event |
| Aug 13, 2025 | 5 hrs | 1,106 (40%) | Unnamed event |
| Jun 28, 2024 | 4 hrs | 1,103 (40%) | Thunderstorm Wind |
Over the 8 years from 2018 to 2025, Ziebach County recorded 71 distinct power outage events, averaging 3.7 hours per event.
The single worst outage on record in Ziebach County started November 14, 2025, lasting 2 hours and leaving up to 1,571 customers without power (56% of the county) at its peak.
August has historically been the worst month for outages in Ziebach County, with 11 events recorded during that month across the dataset.
Based on this history, Ziebach County earns a Reliability Grade of A, placing it in the 81st percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Ziebach 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 Ziebach County.
| County | Grade | National percentile |
|---|---|---|
| Pennington County | A | 81st |
| Jones County | A | 82nd |
| Lyman County | A | 81st |
| Roberts County | A | 83rd |
| Brule County | B | 80th |
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 Ziebach County?
Between 2018 and 2025, Ziebach County recorded 71 outage events, averaging 3.7 hours each.
What is Ziebach County's reliability grade?
Ziebach County has a Reliability Grade of A, in the 81st national percentile.
What was the worst power outage in Ziebach County?
The worst outage on record started November 14, 2025, lasting 2 hours and affecting up to 1,571 customers.