Grant CountyPower Outage History
2019–2025 · South Dakota
Worse than average — more frequent or longer outages than most counties.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Apr 7, 2025 | 1 hrs | 1,916 (32%) | Winter Storm |
| Aug 12, 2025 | 3 hrs | 1,910 (32%) | Flood |
| Jan 17, 2025 | <1 hr | 1,821 (30%) | Unnamed event |
| Aug 21, 2024 | <1 hr | 1,674 (28%) | Unnamed event |
| Jul 19, 2022 | 57 hrs | 1,495 (25%) | Unnamed event |
Over the 7 years from 2019 to 2025, Grant County recorded 139 distinct power outage events, averaging 4.2 hours per event.
The single worst outage on record in Grant County started April 7, 2025 (Winter Storm), lasting 1 hours and leaving up to 1,916 customers without power (32% of the county) at its peak.
May has historically been the worst month for outages in Grant County, with 21 events recorded during that month across the dataset.
Based on this history, Grant County earns a Reliability Grade of D, placing it in the 31st percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Grant County's outage profile
See more picks in our Best Dual-Fuel Portable Generators for Power Outages roundup.
Champion Power Equipment 4375-Watt Dual Fuel RV Ready Portable Generator with Free 3-Year Warranty
Outage-prep kit
See our outage-prep guides.
Similar counties in South Dakota
Counties with the closest reliability grade and national percentile to Grant County.
| County | Grade | National percentile |
|---|---|---|
| Custer County | D | 30th |
| Perkins County | D | 29th |
| Marshall County | D | 37th |
| Harding County | D | 21st |
| McCook County | C | 43rd |
Most reliable counties in South Dakota
The top 3 counties in South Dakota by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Clay County | A | 100th |
| Codington County | A | 98th |
| Tripp County | A | 98th |
Least reliable counties in South Dakota
The bottom 3 counties in South Dakota by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Harding County | D | 21st |
| Perkins County | D | 29th |
| Custer County | D | 30th |
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 Grant County?
Between 2019 and 2025, Grant County recorded 139 outage events, averaging 4.2 hours each.
What is Grant County's reliability grade?
Grant County has a Reliability Grade of D, in the 31st national percentile.
What was the worst power outage in Grant County?
The worst outage on record started April 7, 2025 (Winter Storm), lasting 1 hours and affecting up to 1,916 customers.