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

Power outage history

Harding County South Dakota

60hours

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

9.1× the national median

Worst outage on record May 5, 2021 100% of customers out · 90% back in 2.2 days
Hours without power, average customer per year 60h / yr State average 4.8 h · national median 6.6 h
Major outages a year 23.3 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 8.3days Nov 13, 2020, over 1% of customers out
Outage hours on storm days 19% Share falling on days with a NOAA storm report here
Worst year 2021 4.3 days without power, average customer
Electricity customers 403 ORNL customer model · 7 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 Harding'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

2021 was the worst well-recorded year, at 4.3 days for the average customer. Hatched years have a thin record and are left out of the averages.

Harding, hours without power per customer

HardingUS median countySouth Dakota average
0 20 40 60 80 100 120 ’17 ’18 16 ’19 90 ’20 104 ’21 87 ’22 31 ’23 42 ’24 47 ’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 4, 2021 No storm report 403 100% 3.1 d 2.2 d 23k
Nov 13, 2020 No storm report 75 19% 8.3 d 3.3 d 15k
Sep 14, 2022 No storm report 236 59% 2.0 d 46 h 8.0k
Dec 15, 2022 Winter storm 290 72% 2.4 d 8.0 h 8.0k
Sep 8, 2020 No storm report 403 100% 19 h 25 h 7.3k
Sep 11, 2024 No storm report 403 100% 19 h 2.2 h 5.1k
May 7, 2023 No storm report 262 65% 17 h 17 h 4.1k
Nov 9, 2021 No storm report 113 28% 36 h 12 h 4.0k
Jun 16, 2020 No storm report 268 67% 12 h 12 h 3.1k
Apr 21, 2022 No storm report 403 100% 7.5 h 7.5 h 3.0k
Oct 3, 2022 No storm report 137 34% 22 h 22 h 2.9k
Jun 20, 2025 Thunderstorms 316 78% 2.6 d 13 h 2.7k

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 +12h 90% by +18h

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

  • No storm on record 81%
  • Thunderstorms 8.5%
  • Winter storm 7.3%
  • Windstorm 3.0%

Who keeps the lights on

Utilities serving Harding

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
Grand Electric Coop, Inc SD – – – 11.7 52k
Montana-Dakota Utilities Co Investor Owned 212 206 2.62 13.0 6.3k
Southeast Electric Coop, Inc MT – – – – 176

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 403 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 →