Roberts County Power Outage History
2019–2025 · 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 |
|---|---|---|---|
| Apr 1, 2023 | 2 hrs | 1,175 (17%) | Blizzard |
| Jun 21, 2020 | 1 hrs | 1,155 (16%) | High Wind |
| Apr 28, 2021 | 2 hrs | 1,096 (16%) | Unnamed event |
| Dec 28, 2022 | 4 hrs | 1,086 (15%) | Extreme Cold/Wind Chill |
| Dec 23, 2020 | 2 hrs | 1,003 (14%) | Blizzard |
Over the 7 years from 2019 to 2025, Roberts County recorded 186 distinct power outage events, averaging 3.5 hours per event.
The single worst outage on record in Roberts County started April 1, 2023 (Blizzard), lasting 2 hours and leaving up to 1,175 customers without power (17% of the county) at its peak.
July has historically been the worst month for outages in Roberts County, with 36 events recorded during that month across the dataset.
Based on this history, Roberts County earns a Reliability Grade of A, placing it in the 83rd percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Roberts County's outage profile
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Similar counties in South Dakota
Counties with the closest reliability grade and national percentile to Roberts County.
| County | Grade | National percentile |
|---|---|---|
| Jones County | A | 82nd |
| Bon Homme County | A | 85th |
| Ziebach County | A | 81st |
| Pennington County | A | 81st |
| Butte County | A | 85th |
FAQ
How often does power go out in Roberts County?
Between 2019 and 2025, Roberts County recorded 186 outage events, averaging 3.5 hours each.
What is Roberts County's reliability grade?
Roberts County has a Reliability Grade of A, in the 83rd national percentile.
What was the worst power outage in Roberts County?
The worst outage on record started April 1, 2023 (Blizzard), lasting 2 hours and affecting up to 1,175 customers.