Oglala Lakota County Power Outage History
2018–2025 · South Dakota
Top 20% most reliable nationally — infrequent, short outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Dec 16, 2022 | 1 hrs | 1,500 (21%) | Blizzard |
| Jul 30, 2020 | 2 hrs | 907 (13%) | Flash Flood |
| Jan 7, 2022 | 3 hrs | 901 (13%) | Unnamed event |
| May 28, 2022 | 0 hrs | 880 (12%) | Unnamed event |
| Jun 1, 2025 | 4 hrs | 816 (11%) | Unnamed event |
Over the 8 years from 2018 to 2025, Oglala Lakota County recorded 66 distinct power outage events, averaging 2.7 hours per event.
The single worst outage on record in Oglala Lakota County started December 16, 2022 (Blizzard), lasting 1 hours and leaving up to 1,500 customers without power (21% of the county) at its peak.
June has historically been the worst month for outages in Oglala Lakota County, with 10 events recorded during that month across the dataset.
Based on this history, Oglala Lakota County earns a Reliability Grade of A, placing it in the 96th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Oglala Lakota County's outage profile
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Similar counties in South Dakota
Counties with the closest reliability grade and national percentile to Oglala Lakota County.
| County | Grade | National percentile |
|---|---|---|
| Hand County | A | 96th |
| Dewey County | A | 96th |
| Corson County | A | 96th |
| Jerauld County | A | 96th |
| Potter County | A | 94th |
FAQ
How often does power go out in Oglala Lakota County?
Between 2018 and 2025, Oglala Lakota County recorded 66 outage events, averaging 2.7 hours each.
What is Oglala Lakota County's reliability grade?
Oglala Lakota County has a Reliability Grade of A, in the 96th national percentile.
What was the worst power outage in Oglala Lakota County?
The worst outage on record started December 16, 2022 (Blizzard), lasting 1 hours and affecting up to 1,500 customers.