Lake County Power Outage History
2014–2025 · South Dakota
Better than average — fewer or shorter outages than most counties. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Oct 2, 2017 | 9 hrs | 4,106 (46%) | Unnamed event |
| May 12, 2022 | 99 hrs | 3,402 (38%) | High Wind |
| Nov 8, 2017 | 6 hrs | 2,421 (27%) | Unnamed event |
| Oct 2, 2017 | 1 hrs | 2,409 (27%) | Unnamed event |
| Nov 10, 2022 | 0 hrs | 1,337 (15%) | Unnamed event |
Over the 12 years from 2014 to 2025, Lake County recorded 208 distinct power outage events, averaging 3.0 hours per event.
The single worst outage on record in Lake County started October 2, 2017, lasting 9 hours and leaving up to 4,106 customers without power (46% of the county) at its peak.
June has historically been the worst month for outages in Lake County, with 44 events recorded during that month across the dataset.
Based on this history, Lake County earns a Reliability Grade of B, placing it in the 65th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Lake County's outage profile
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Outage-prep kit
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Similar counties in South Dakota
Counties with the closest reliability grade and national percentile to Lake County.
| County | Grade | National percentile |
|---|---|---|
| Hanson County | B | 65th |
| Day County | B | 65th |
| Fall River County | B | 65th |
| Yankton County | B | 65th |
| Turner County | B | 64th |
FAQ
How often does power go out in Lake County?
Between 2014 and 2025, Lake County recorded 208 outage events, averaging 3.0 hours each.
What is Lake County's reliability grade?
Lake County has a Reliability Grade of B, in the 65th national percentile.
What was the worst power outage in Lake County?
The worst outage on record started October 2, 2017, lasting 9 hours and affecting up to 4,106 customers.