Power outage history
Hanson County South Dakota
6.2hours
without power for the average customer in a typical year, 2018–2025
13th most of 32 in South Dakota close to 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 Hanson's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2019 was the worst well-recorded year, at 14 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Hanson, 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 |
|---|---|---|---|---|---|---|
| May 12, 2022 | Thunderstorms | 786 | 40% | 27 h | 25 h | 20k |
| Apr 11, 2019 | Flooding | 722 | 37% | 19 h | 21 h | 12k |
| Jul 20, 2019 | Thunderstorms | 824 | 42% | 36 h | 10 h | 9.5k |
| Dec 25, 2023 | Winter storm | 747 | 38% | 7.2 h | 3.2 h | 4.0k |
| Dec 24, 2022 | No storm report | 1,477 | 75% | 4.0 h | 9.8 h | 2.9k |
| Jul 18, 2017 | No storm report | 716 | 37% | 3.5 h | 3.5 h | 2.5k |
| Sep 21, 2024 | No storm report | 749 | 38% | 6.0 h | 3.8 h | 2.5k |
| Jul 28, 2025 | Heat | 848 | 43% | 4.0 h | 1.0 h | 2.3k |
| Aug 18, 2015 | No storm report | 714 | 36% | 3.2 h | 4.5 h | 2.1k |
| Jan 12, 2016 | No storm report | 717 | 37% | 3.0 h | 2.2 h | 2.0k |
| Jun 17, 2024 | No storm report | 746 | 38% | 2.5 h | 2.8 h | 1.9k |
| Jun 11, 2025 | No storm report | 756 | 39% | 2.5 h | 11 h | 1.7k |
| Apr 19, 2024 | No storm report | 25 | 1% | 2.8 d | – | 1.6k |
| Jun 24, 2018 | No storm report | 722 | 37% | 1.8 h | 1.8 h | 1.3k |
| Jan 6, 2023 | No storm report | 739 | 38% | 1.8 h | 2.0 h | 1.2k |
| Jul 23, 2019 | Flooding | 722 | 37% | 2.2 h | 1.5 h | 1.2k |
| Dec 16, 2015 | No storm report | 715 | 36% | 1.8 h | 1.8 h | 1.1k |
| Mar 15, 2021 | Winter storm | 202 | 10% | 12 h | 6.0 h | 1.0k |
| Aug 23, 2021 | No storm report | 250 | 13% | 3.0 h | 3.0 h | 745 |
| Jul 5, 2022 | Flooding | 118 | 6% | 7.8 h | 18 h | 651 |
| Oct 22, 2020 | Winter storm | 418 | 21% | 2.2 h | 2.0 h | 590 |
| Jul 22, 2019 | Flooding | 722 | 37% | 1.5 h | 48 min | 566 |
| May 22, 2018 | No storm report | 264 | 13% | 1.5 h | 1.5 h | 396 |
| Jul 29, 2025 | Thunderstorms | 86 | 4% | 6.8 h | – | 391 |
| Mar 1, 2023 | No storm report | 82 | 4% | 4.5 h | – | 369 |
| Jun 22, 2015 | No storm report | 39 | 2% | 7.8 h | – | 248 |
| May 28, 2018 | No storm report | 129 | 7% | 3.0 h | 13 h | 233 |
| Dec 15, 2021 | Windstorm | 83 | 4% | 3.2 h | – | 230 |
| Jun 5, 2023 | Flooding | 82 | 4% | 2.8 h | – | 226 |
| Nov 30, 2019 | Winter storm | 74 | 4% | 3.0 h | – | 222 |
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 Hanson from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Thunderstorms 42%
- No storm on record 23%
- Flooding 23%
- Winter storm 8.2%
- Heat 3.3%
Who keeps the lights on
Utilities serving Hanson
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 |
|---|---|---|---|---|---|---|
| Northern States Power Co - Minnesota | Investor Owned | 160 | 58 | 0.88 | 13.1 | 94k |
| NorthWestern Energy | Investor Owned | 120 | 82 | 1.14 | 13.3 | 52k |
| Southeastern Electric Coop Inc | Cooperative | 24 | 24 | – | 13.0 | 21k |
| Central Electric Coop, Inc | Cooperative | – | – | – | 14.7 | 6.5k |
| 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
- Sanborn 12 h
- McCook 11 h
- Hanson (this county) 6.2 h
- Hutchinson 2.5 h
- Davison 2.5 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 1,960 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 →