Corson CountyPower Outage History
What this grade means
(How grades are calculated)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 27, 2024 | 3 hrs | 281 (8%) | Drought |
| Jul 14, 2024 | 4 hrs | 224 (6%) | Unnamed event |
| Nov 13, 2024 | 2 hrs | 209 (6%) | Drought |
| Sep 22, 2024 | 1 hrs | 207 (6%) | Unnamed event |
| Aug 21, 2025 | 2 hrs | 201 (6%) | Thunderstorm Wind |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Corson County, South Dakota that day.
Over the 9 years from 2017 to 2025, Corson County recorded 73 distinct power outage events, averaging 2.1 hours per event.
The single worst outage on record in Corson County started November 27, 2024 (Drought), lasting 3 hours and leaving up to 281 customers without power (8% of the county) at its peak.
June has historically been the worst month for outages in Corson County, with 15 events recorded during that month across the dataset.
Based on this history, Corson County earns a Reliability Grade of A, placing it in the 96th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in South Dakota
Counties with the closest reliability grade and national percentile to Corson County.
| County | Grade | National percentile |
|---|---|---|
| Jerauld County | A | 96th |
| Oglala Lakota County | A | 96th |
| Hand County | A | 96th |
| Dewey County | A | 96th |
| Gregory County | A | 98th |
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 Corson County?
Between 2017 and 2025, Corson County recorded 73 outage events, averaging 2.1 hours each.
What is Corson County's reliability grade?
Corson County has a Reliability Grade of A, in the 96th national percentile.
What was the worst power outage in Corson County?
The worst outage on record started November 27, 2024 (Drought), lasting 3 hours and affecting up to 281 customers.