Union County Power Outage History
2015–2025 · 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 |
|---|---|---|---|
| Sep 6, 2016 | 1 hrs | 3,566 (51%) | Unnamed event |
| Jul 23, 2022 | 2 hrs | 2,144 (30%) | Drought |
| Oct 3, 2021 | 1 hrs | 1,843 (26%) | Unnamed event |
| Jul 13, 2024 | 1 hrs | 1,806 (26%) | Flood |
| Jul 11, 2016 | 3 hrs | 1,781 (25%) | Unnamed event |
Over the 11 years from 2015 to 2025, Union County recorded 190 distinct power outage events, averaging 2.6 hours per event.
The single worst outage on record in Union County started September 6, 2016, lasting 1 hours and leaving up to 3,566 customers without power (51% of the county) at its peak.
July has historically been the worst month for outages in Union County, with 33 events recorded during that month across the dataset.
Based on this history, Union County earns a Reliability Grade of A, placing it in the 86th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Union County's outage profile
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Similar counties in South Dakota
Counties with the closest reliability grade and national percentile to Union County.
| County | Grade | National percentile |
|---|---|---|
| Meade County | A | 86th |
| Butte County | A | 85th |
| Bon Homme County | A | 85th |
| Aurora County | A | 87th |
| Roberts County | A | 83rd |
FAQ
How often does power go out in Union County?
Between 2015 and 2025, Union County recorded 190 outage events, averaging 2.6 hours each.
What is Union County's reliability grade?
Union County has a Reliability Grade of A, in the 86th national percentile.
What was the worst power outage in Union County?
The worst outage on record started September 6, 2016, lasting 1 hours and affecting up to 3,566 customers.