Power Out Map
– 0% of Bon Homme out 0 customers out in South Dakota

Power outage history

Bon Homme County South Dakota

5.6hours

without power for the average customer in a typical year, 2018–2025

15% below the national median

Worst outage on record May 12, 2022 63% of customers out · 90% back in 5.2 hours
Hours without power, average customer per year 5.6h / yr State average 4.8 h · national median 6.6 h
Major outages a year 6.7 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 2hours Median across major outages, from the peak
Longest single outage 32hours May 30, 2020, over 1% of customers out
Outage hours on storm days 49% Share falling on days with a NOAA storm report here
Worst year 2025 7.4 hours without power, average customer
Electricity customers 2,917 ORNL customer model · 3 well-covered years

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 Bon Homme's customers who were without power at that day's worst moment.

20152016201720182019202020212022202320242025
0%100% of customers out

Year by year

Hours in the dark, per customer

2025 was the worst well-recorded year, at 7.4 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Bon Homme, hours without power per customer

Bon HommeUS median countySouth Dakota average
0 2 4 6 8 10 5.4 ’20 ’21 ’22 ’23 3.9 ’24 7.4 ’25 US 6.6 SD 4.8

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 1,845 63% 31 h 5.2 h 20k
Mar 15, 2025 No storm report 2,917 100% 5.0 h 3.8 h 10k
Nov 30, 2025 No storm report 2,155 74% 4.0 h 12 h 6.6k
Jul 29, 2024 Thunderstorms 985 34% 6.8 h 2.5 h 3.9k
Jun 23, 2024 Flooding 716 25% 5.0 h 5.0 h 3.6k
Nov 8, 2020 No storm report 1,101 38% 3.2 h 1.5 h 3.2k
May 30, 2020 Flooding 85 3% 32 h – 2.7k
Aug 20, 2020 No storm report 537 18% 4.2 h 4.0 h 2.3k
Dec 22, 2020 No storm report 576 20% 4.0 h 3.8 h 2.2k
Nov 14, 2024 No storm report 532 18% 3.8 h 3.8 h 2.0k
Mar 6, 2020 Flooding 705 24% 4.5 h 30 min 1.3k
Dec 17, 2022 No storm report 514 18% 3.0 h 3.0 h 1.2k

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.

0% 25% 50% 75% 100% peak+24h+48h+72h+96h half back by +4h 90% by +4h

When it happens

The outage clock

Customer-hours out by month (rings, January innermost) and local hour, 2018–2025.

00061218 Jan inside

What was happening

Weather behind the outages

Each outage is matched to NOAA storm reports for Bon Homme from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.

  • No storm on record 51%
  • Thunderstorms 38%
  • Flooding 11%
  • Windstorm 0.7%

Who keeps the lights on

Utilities serving Bon Homme

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
Bon Homme Yankton El Assn, Inc SD 34 34 0.32 11.3 62k
NorthWestern Energy Investor Owned 120 82 1.14 13.3 52k
Charles Mix Electric Assn, Inc SD – – – 13.4 35k
Southeastern Electric Coop Inc Cooperative 24 24 – 13.0 21k
City of Tyndall SD – – – – 8.3k
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

Across South Dakota

Where it is darkest

Hours / yr64+

All South Dakota 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 2,917 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 →