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

Power outage history

Yankton County South Dakota

6.4hours

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

11th most of 32 in South Dakota close to the national median

Worst outage on record Oct 11, 2020 6% of customers out · 90% back in 26.7 days
Hours without power, average customer per year 6.4h / yr State average 4.8 h · national median 6.6 h
Major outages a year 1.7 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 26.7days Oct 11, 2020, over 1% of customers out
Outage hours on storm days 10% Share falling on days with a NOAA storm report here
Worst year 2020 30 hours without power, average customer
Electricity customers 11,940 ORNL customer model · 6 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 Yankton'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

2020 was the worst well-recorded year, at 30 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Yankton, hours without power per customer

YanktonUS median countySouth Dakota average
0 5 10 15 20 ’19 30 ’20 1.4 ’21 1.6 ’22 3.1 ’23 0.8 ’24 2.3 ’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
Oct 11, 2020 No storm report 758 6% 26.7 d 26.7 d 283k
Dec 15, 2020 No storm report 1,071 9% 43 h 43 h 42k
Jul 18, 2023 No storm report 5,835 49% 3.5 h 1.2 h 11k
Feb 18, 2025 Winter storm 1,953 16% 4.0 h 3.2 h 7.4k
May 7, 2023 Flooding 3,237 27% 2.5 h 2.0 h 6.8k
Mar 5, 2022 Winter storm 3,235 27% 2.0 h 30 min 6.1k
May 8, 2021 No storm report 1,756 15% 2.2 h 2.2 h 4.0k
Jul 29, 2025 Thunderstorms 1,081 9% 3.5 h 1.2 h 3.8k
Jul 6, 2020 Thunderstorms 1,406 12% 3.8 h 3.0 h 3.6k
Aug 16, 2023 No storm report 2,187 18% 1.8 h 1.0 h 3.5k
Mar 15, 2025 Thunderstorms 1,433 12% 2.8 h 1.2 h 3.0k
Jun 27, 2025 Thunderstorms 864 7% 3.5 h 7.2 h 3.0k

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 +2h 90% by +2h

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 Yankton from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.

  • No storm on record 90%
  • Thunderstorms 4.2%
  • Winter storm 3.3%
  • Flooding 2.1%

Who keeps the lights on

Utilities serving Yankton

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
Clay-Union Electric Corp SD – – – 11.6 53k
NorthWestern Energy Investor Owned 120 82 1.14 13.3 52k
Southeastern Electric Coop Inc Cooperative 24 24 – 13.0 21k
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 11,940 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 →