Day CountyPower Outage History
What this grade means
Better than average — fewer or shorter outages than most counties. This county's outage history is better than the national median: recorded outages are less frequent and/or shorter in duration than a typical US county experienced over the same 12-year period. It isn't in the top tier nationally, but its track record points to lower-than-average outage risk.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Apr 7, 2022 | 3 hrs | 2,407 (30%) | High Wind |
| Dec 14, 2022 | 17 hrs | 2,317 (29%) | Ice Storm |
| Feb 27, 2021 | 6 hrs | 2,014 (25%) | Unnamed event |
| Dec 13, 2022 | 9 hrs | 1,821 (23%) | Ice Storm |
| Nov 25, 2025 | 4 hrs | 1,447 (18%) | Blizzard |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Day County, South Dakota that day.
Over the 7 years from 2019 to 2025, Day County recorded 270 distinct power outage events, averaging 4.8 hours per event.
The single worst outage on record in Day County started April 7, 2022 (High Wind), lasting 3 hours and leaving up to 2,407 customers without power (30% of the county) at its peak.
October has historically been the worst month for outages in Day County, with 40 events recorded during that month across the dataset.
Based on this history, Day County earns a Reliability Grade of B, placing it in the 65th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in South Dakota
Counties with the closest reliability grade and national percentile to Day County.
| County | Grade | National percentile |
|---|---|---|
| Lake County | B | 65th |
| Hanson County | B | 65th |
| Fall River County | B | 65th |
| Yankton County | B | 65th |
| Turner County | B | 64th |
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 Day County?
Between 2019 and 2025, Day County recorded 270 outage events, averaging 4.8 hours each.
What is Day County's reliability grade?
Day County has a Reliability Grade of B, in the 65th national percentile.
What was the worst power outage in Day County?
The worst outage on record started April 7, 2022 (High Wind), lasting 3 hours and affecting up to 2,407 customers.