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

Power outage history

Hamlin County South Dakota

12hours

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

5th most of 32 in South Dakota 1.9× the national median

Worst outage on record May 12, 2022 96% of customers out · 90% back in 46 hours
Hours without power, average customer per year 12h / yr State average 4.8 h · national median 6.6 h
Major outages a year 6.4 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 3hours Median across major outages, from the peak
Longest single outage 2.1days May 12, 2022, over 1% of customers out
Outage hours on storm days 47% Share falling on days with a NOAA storm report here
Worst year 2022 25 hours without power, average customer
Electricity customers 2,187 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 Hamlin'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

2022 was the worst well-recorded year, at 25 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Hamlin, hours without power per customer

HamlinUS median countySouth Dakota average
0 10 20 30 ’18 1.2 ’19 23 ’20 24 ’21 25 ’22 7.8 ’23 3.6 ’24 2.7 ’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 2,092 96% 2.1 d 46 h 42k
Jul 17, 2021 No storm report 666 30% 45 h 41 h 25k
Jan 18, 2020 Winter storm 432 20% 48 h 48 h 20k
Aug 28, 2020 Thunderstorms 1,049 48% 7.8 h 7.0 h 4.9k
Aug 11, 2021 No storm report 336 15% 17 h 16 h 4.5k
Jul 28, 2021 No storm report 489 22% 8.8 h 8.8 h 3.7k
Jul 10, 2021 No storm report 105 5% 48 h – 3.7k
Jan 2, 2020 No storm report 556 25% 7.2 h 5.8 h 3.5k
Jun 22, 2023 No storm report 419 19% 15 h 7.2 h 3.3k
Dec 13, 2020 No storm report 127 6% 21 h 21 h 2.6k
Jan 25, 2023 No storm report 575 26% 6.2 h 4.5 h 2.6k
Jun 28, 2025 No storm report 930 43% 2.8 h 2.5 h 2.4k

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 +8h 90% by +10h

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

  • No storm on record 53%
  • Thunderstorms 29%
  • Winter storm 13%
  • Ice storm 2.5%
  • Flooding 2.3%

Who keeps the lights on

Utilities serving Hamlin

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
Codington-Clark Elec Coop, Inc SD – – – 9.4 87k
H-D Electric Coop Inc SD 60 60 1.02 11.1 67k
NorthWestern Energy Investor Owned 120 82 1.14 13.3 52k
Kingsbury Electric Coop, Inc SD – – – – 24k
Sioux Valley SW Elec Coop Cooperative 59 59 1.64 13.9 23k
Otter Tail Power Co Investor Owned 191 189 1.73 11.4 9.1k
City of Estelline SD – – – – 4.8k
City of Bryant SD – – – – 2.3k
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 2,187 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 →