Power Out Map
– 0% of Sioux out 0 customers out in North Dakota

Power outage history

Sioux County North Dakota

The outage record here is too thin for a reliable yearly average. Raw events are listed below.

Worst outage on record Oct 14, 2021 4% of customers out · lasted 3.0 hours
Hours without power, average customer per year –h / yr State average 2.1 h · national median 6.6 h
Major outages a year – Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% – Median across major outages, from the peak
Longest single outage 4hours Dec 20, 2025, over 1% of customers out
Outage hours on storm days 32% Share falling on days with a NOAA storm report here
Worst year –
Electricity customers 2,559 ORNL customer model · 0 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 Sioux'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

Sioux, hours without power per customer

SiouxUS median countyNorth Dakota average
0 2 4 6 8 ’19 ’20 ’21 ’22 ’23 ’25 US 6.6 ND 2.1

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 14, 2021 No storm report 92 4% 3.0 h – 272
Apr 6, 2020 No storm report 88 3% 2.5 h – 220
Jun 21, 2023 Thunderstorms 79 3% 2.8 h – 212
Jan 17, 2020 No storm report 88 3% 2.2 h – 198
Aug 14, 2021 No storm report 89 3% 2.2 h – 197
Aug 12, 2020 No storm report 88 3% 2.0 h – 171
Aug 5, 2021 No storm report 83 3% 2.0 h – 166
Nov 7, 2022 Windstorm 80 3% 2.0 h – 160
Sep 4, 2023 Thunderstorms 80 3% 2.0 h – 156
Jun 19, 2020 No storm report 90 4% 1.5 h – 121
Apr 12, 2022 Winter storm 79 3% 1.5 h – 115
Aug 14, 2020 Thunderstorms 89 3% 1.2 h – 110

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

  • No storm on record 68%
  • Thunderstorms 20%
  • Windstorm 6.8%
  • Winter storm 4.9%

Who keeps the lights on

Utilities serving Sioux

As each utility reports to the Energy Information Administration for its whole North 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
Mor-Gran-Sou Electric Coop Inc ND – – – 13.4 92k
Montana-Dakota Utilities Co Investor Owned 95 65 0.81 11.1 80k

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 North Dakota

Where it is darkest

Hours / yr64+

All North 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 2,559 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 →