Power outage history
Roberts County South Dakota
5.1hours
without power for the average customer in a typical year, 2018–2025
17th most of 32 in South Dakota 22% below the national median
Every day since 2015
Eleven years, one night at a time
Each cell is a day. The brighter it is, the larger the share of Roberts's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2022 was the worst well-recorded year, at 9.9 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Roberts, hours without power per customer
The record
The biggest outages since 2015
Ranked by customer-hours lost: customers out multiplied by how long they stayed out. Times are local.
| Began | Storm | Peak out | Share | Lasted | 90% restored | Customer-hours |
|---|---|---|---|---|---|---|
| Feb 18, 2022 | Windstorm | 583 | 14% | 44 h | 44 h | 26k |
| Feb 3, 2024 | No storm report | 392 | 10% | 40 h | 44 h | 5.0k |
| Jun 4, 2025 | No storm report | 200 | 5% | 25 h | – | 4.9k |
| Jul 4, 2022 | No storm report | 832 | 20% | 11 h | 11 h | 4.8k |
| Nov 25, 2025 | Winter storm | 956 | 23% | 6.5 h | 5.0 h | 3.1k |
| May 12, 2022 | Thunderstorms | 793 | 19% | 15 h | 2.5 h | 3.1k |
| May 6, 2024 | No storm report | 888 | 22% | 3.2 h | 1.5 h | 2.8k |
| Apr 28, 2021 | No storm report | 1,096 | 27% | 2.2 h | 2.0 h | 2.4k |
| Mar 31, 2023 | Winter storm | 1,175 | 29% | 15 h | 30 min | 2.4k |
| Dec 25, 2025 | No storm report | 538 | 13% | 6.5 h | 6.5 h | 2.2k |
| Dec 29, 2019 | Winter storm | 150 | 4% | 14 h | – | 2.1k |
| Sep 1, 2025 | No storm report | 199 | 5% | 9.0 h | – | 1.8k |
| Dec 23, 2020 | No storm report | 1,003 | 24% | 1.8 h | 1.8 h | 1.8k |
| Jul 17, 2020 | Thunderstorms | 591 | 14% | 4.2 h | 48 min | 1.7k |
| Aug 7, 2023 | No storm report | 198 | 5% | 8.0 h | – | 1.5k |
| Aug 17, 2023 | No storm report | 193 | 5% | 8.0 h | – | 1.5k |
| Dec 28, 2022 | No storm report | 1,086 | 27% | 3.5 h | 11 h | 1.4k |
| Dec 28, 2023 | No storm report | 601 | 15% | 2.2 h | 2.2 h | 1.4k |
| May 15, 2025 | Thunderstorms | 452 | 11% | 2.8 h | 2.8 h | 1.2k |
| Jun 20, 2020 | No storm report | 1,155 | 28% | 1.2 h | 1.2 h | 1.1k |
| Oct 30, 2020 | No storm report | 228 | 6% | 4.5 h | 4.5 h | 1.0k |
| Apr 1, 2023 | No storm report | 204 | 5% | 4.8 h | – | 961 |
| Jun 20, 2025 | No storm report | 208 | 5% | 4.5 h | 13 h | 936 |
| Mar 22, 2025 | No storm report | 537 | 13% | 2.0 h | 1.8 h | 866 |
| Jan 15, 2024 | Winter storm | 494 | 12% | 1.8 h | 1.8 h | 864 |
| Jul 28, 2025 | Thunderstorms | 561 | 14% | 3.0 h | 2.0 h | 814 |
| Dec 7, 2021 | No storm report | 146 | 4% | 5.5 h | – | 803 |
| Jun 20, 2022 | Thunderstorms | 75 | 2% | 11 h | – | 800 |
| Jul 4, 2023 | No storm report | 378 | 9% | 2.5 h | 1.5 h | 694 |
| Jul 12, 2022 | No storm report | 452 | 11% | 1.5 h | 1.5 h | 678 |
After the peak
How fast the lights come back
Each line is one major outage, from its peak. The amber line is the typical path.
When it happens
The outage clock
Customer-hours out by month (rings, January innermost) and local hour, 2018–2025.
What was happening
Weather behind the outages
Each outage is matched to NOAA storm reports for Roberts from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 55%
- Windstorm 27%
- Winter storm 9.8%
- Thunderstorms 8.3%
Who keeps the lights on
Utilities serving Roberts
As each utility reports to the Energy Information Administration for its whole South Dakota territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Codington-Clark Elec Coop, Inc | SD | – | – | – | 9.4 | 87k |
| Lake Region Electric Assn, Inc | SD | – | – | – | 12.0 | 62k |
| Whetstone Valley Elec Coop Inc | SD | 56 | 56 | 1.62 | 12.1 | 60k |
| Traverse Electric Coop, Inc | MN | – | – | – | 11.2 | 22k |
| Otter Tail Power Co | Investor Owned | 191 | 189 | 1.73 | 11.4 | 9.1k |
| Montana-Dakota Utilities Co | Investor Owned | 212 | 206 | 2.62 | 13.0 | 6.3k |
| WAPA-- Western Area Power Administration | Federal | – | – | – | – | – |
EIA Form 861, latest year each utility reported. Outage minutes are SAIDI, the yearly minutes the average customer goes without power; outages a year are SAIFI.
Next door
Neighbouring counties
- Grant 26 h
- Marshall 16 h
- Sargent, ND 12 h
- Day 8.5 h
- Roberts (this county) 5.1 h
- Richland, ND 4.2 h
About these numbers
Notes
Outages come from the EAGLE-I record of utility outage maps collected every 15 minutes by Oak Ridge National Laboratory. Hours without power are customer-hours divided by the county's 4,096 electricity customers. Averages use well-covered years from 2018. Outages shorter than 15 minutes, and utilities that publish no outage map, are not in the record, so these figures understate the total. How every number is made →