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

Power outage history

Oglala Lakota County South Dakota

1.0hours

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

85% below the national median

Worst outage on record May 31, 2025 20% of customers out · 90% back in 4.0 hours
Hours without power, average customer per year 1.0h / yr State average 4.8 h · national median 6.6 h
Major outages a year 2.8 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 1hours Median across major outages, from the peak
Longest single outage 16hours Apr 11, 2022, over 1% of customers out
Outage hours on storm days 32% Share falling on days with a NOAA storm report here
Worst year 2025 2.1 hours without power, average customer
Electricity customers 4,164 ORNL customer model · 4 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 Oglala Lakota'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 2.1 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Oglala Lakota, hours without power per customer

Oglala LakotaUS median countySouth Dakota average
0 2 4 6 8 ’18 ’19 0.9 ’20 ’21 ’22 0.4 ’23 0.5 ’24 2.1 ’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 31, 2025 No storm report 816 20% 4.0 h 4.0 h 3.2k
Jan 7, 2022 No storm report 901 22% 5.8 h 1.2 h 3.1k
Dec 16, 2022 Winter storm 1,500 36% 1.2 h 1.2 h 1.9k
Jul 30, 2020 Flooding 907 22% 1.8 h 6.5 h 1.6k
Jun 13, 2025 No storm report 549 13% 2.8 h 1.2 h 1.5k
Apr 26, 2025 No storm report 806 19% 1.2 h 8.2 h 1.0k
May 21, 2025 No storm report 336 8% 2.8 h 2.8 h 924
Apr 11, 2022 No storm report 57 1% 16 h – 898
Jun 20, 2021 No storm report 265 6% 3.2 h 3.2 h 861
Aug 6, 2024 No storm report 563 14% 1.2 h 12 min 689
Nov 22, 2023 No storm report 547 13% 1.8 h 48 min 682
Feb 13, 2024 No storm report 261 6% 2.5 h 2.5 h 652

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

  • No storm on record 68%
  • Winter storm 16%
  • Flooding 7.0%
  • Thunderstorms 5.2%
  • Windstorm 2.9%

Who keeps the lights on

Utilities serving Oglala Lakota

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
LaCreek Electric Assn, Inc SD 130 130 1.16 11.1 76k
West River Electric Assn Inc Cooperative 24 24 0.30 15.2 19k
Black Hills Electric Coop, Inc Cooperative 2,487 120 3.41 14.8 9.4k
Nebraska Public Power District Political Subdivision – – – 10.1 1.0k

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 4,164 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 →