Aurora CountyPower Outage History
2019–2025 · 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 30, 2025 | 3 hrs | 701 (38%) | High Wind |
| May 12, 2022 | 12 hrs | 524 (28%) | Drought |
| Jul 4, 2020 | 2 hrs | 520 (28%) | Thunderstorm Wind |
| Aug 31, 2020 | 2 hrs | 517 (28%) | Unnamed event |
| Sep 6, 2020 | 2 hrs | 517 (28%) | Unnamed event |
Over the 7 years from 2019 to 2025, Aurora County recorded 96 distinct power outage events, averaging 2.1 hours per event.
The single worst outage on record in Aurora County started November 30, 2025 (High Wind), lasting 3 hours and leaving up to 701 customers without power (38% of the county) at its peak.
June has historically been the worst month for outages in Aurora County, with 17 events recorded during that month across the dataset.
Based on this history, Aurora County earns a Reliability Grade of A, placing it in the 87th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Aurora 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 Aurora County.
| County | Grade | National percentile |
|---|---|---|
| Spink County | A | 89th |
| Meade County | A | 86th |
| Union County | A | 86th |
| Butte County | A | 85th |
| Brown County | A | 90th |
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 Aurora County?
Between 2019 and 2025, Aurora County recorded 96 outage events, averaging 2.1 hours each.
What is Aurora County's reliability grade?
Aurora County has a Reliability Grade of A, in the 87th national percentile.
What was the worst power outage in Aurora County?
The worst outage on record started November 30, 2025 (High Wind), lasting 3 hours and affecting up to 701 customers.