Power outage history
Charles Mix County South Dakota
3.1hours
without power for the average customer in a typical year, 2018–2025
25th most of 32 in South Dakota 52% 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 Charles Mix's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2020 was the worst well-recorded year, at 6.4 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Charles Mix, 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 |
|---|---|---|---|---|---|---|
| Jun 9, 2020 | Thunderstorms | 1,364 | 28% | 6.0 h | 5.5 h | 6.0k |
| Jun 10, 2024 | No storm report | 1,190 | 24% | 4.8 h | 4.8 h | 5.6k |
| Jul 29, 2024 | No storm report | 1,204 | 25% | 7.0 h | 10 h | 4.8k |
| Jul 3, 2020 | Thunderstorms | 1,209 | 25% | 4.2 h | 4.2 h | 4.7k |
| Apr 1, 2023 | No storm report | 1,004 | 20% | 5.0 h | 12 min | 4.1k |
| Feb 16, 2021 | Winter storm | 1,464 | 30% | 2.8 h | 2.8 h | 4.0k |
| Oct 5, 2020 | No storm report | 1,464 | 30% | 2.8 h | 1.8 h | 4.0k |
| Feb 20, 2020 | No storm report | 1,177 | 24% | 3.2 h | 48 min | 3.5k |
| Jun 30, 2020 | No storm report | 934 | 19% | 3.8 h | 2.8 h | 2.4k |
| Nov 8, 2020 | No storm report | 947 | 19% | 3.2 h | 1.5 h | 1.9k |
| Jun 26, 2020 | No storm report | 930 | 19% | 2.2 h | 2.2 h | 1.9k |
| Jul 28, 2025 | Thunderstorms | 631 | 13% | 4.0 h | 4.0 h | 1.9k |
| Feb 15, 2023 | Windstorm | 777 | 16% | 3.0 h | 3.0 h | 1.8k |
| Jul 12, 2023 | Thunderstorms | 474 | 10% | 4.0 h | 1.0 h | 1.8k |
| Feb 23, 2021 | No storm report | 1,162 | 24% | 1.5 h | 7.2 h | 1.7k |
| Mar 25, 2024 | Winter storm | 1,201 | 24% | 3.2 h | 5.8 h | 1.7k |
| Jul 21, 2024 | No storm report | 518 | 11% | 3.8 h | 16 h | 1.6k |
| Aug 25, 2024 | Thunderstorms | 276 | 6% | 5.5 h | 8.0 h | 1.5k |
| Dec 23, 2020 | Winter storm | 299 | 6% | 5.2 h | 5.2 h | 1.4k |
| Oct 14, 2021 | No storm report | 205 | 4% | 6.2 h | – | 1.3k |
| Mar 29, 2020 | No storm report | 210 | 4% | 5.5 h | – | 1.2k |
| Dec 15, 2021 | Windstorm | 386 | 8% | 3.2 h | 4.0 h | 1.1k |
| Jun 16, 2023 | No storm report | 743 | 15% | 1.8 h | 1.5 h | 1.1k |
| Sep 23, 2021 | No storm report | 234 | 5% | 4.0 h | – | 936 |
| Aug 4, 2022 | No storm report | 298 | 6% | 3.0 h | 3.0 h | 894 |
| Jun 24, 2023 | Thunderstorms | 344 | 7% | 2.5 h | 2.5 h | 860 |
| Jul 30, 2024 | No storm report | 276 | 6% | 2.5 h | 2.5 h | 690 |
| May 12, 2022 | Thunderstorms | 796 | 16% | 1.2 h | 1.2 h | 605 |
| May 11, 2021 | No storm report | 260 | 5% | 2.2 h | 2.2 h | 585 |
| Sep 10, 2025 | No storm report | 462 | 9% | 1.2 h | 1.0 h | 577 |
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 Charles Mix from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 60%
- Thunderstorms 24%
- Winter storm 11%
- Windstorm 4.7%
Who keeps the lights on
Utilities serving Charles Mix
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 |
|---|---|---|---|---|---|---|
| NorthWestern Energy | Investor Owned | 120 | 82 | 1.14 | 13.3 | 52k |
| Charles Mix Electric Assn, Inc | SD | – | – | – | 13.4 | 35k |
| Douglas Electric Coop, Inc | SD | – | – | – | 12.4 | 19k |
| Town of Pickstown | SD | – | – | – | 10.1 | 2.0k |
| 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
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 4,915 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 →