Edmunds County South Dakota

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

Worst outage on record Feb 3, 2021 54% of customers out · 90% back in 1.5 hours

Hours without power, average customer per year –h / yr State average 4.8 h · national median 6.6 h

Major outages a year – 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 43hours Jun 29, 2021, over 1% of customers out

Outage hours on storm days 37% Share falling on days with a NOAA storm report here

Worst year –

Electricity customers 2,191 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 Edmunds'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

Edmunds, hours without power per customer

EdmundsUS median countySouth Dakota average

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
Feb 3, 2021	Ice storm	1,177	54%	4.5 h	1.5 h	5.2k
Jun 29, 2021	No storm report	171	8%	43 h	26 h	4.0k
Aug 26, 2025	No storm report	306	14%	5.0 h	4.2 h	1.1k
Apr 17, 2025	No storm report	504	23%	2.2 h	2.0 h	1.0k
Jan 8, 2022	No storm report	499	23%	2.0 h	1.5 h	929
Sep 17, 2018	No storm report	171	8%	4.8 h	4.8 h	808
Jun 14, 2022	Thunderstorms	345	16%	8.5 h	2.5 h	784
Jun 4, 2017	No storm report	549	25%	4.0 h	1.2 h	668
Jun 15, 2023	No storm report	223	10%	3.0 h	3.0 h	664
Aug 26, 2021	No storm report	165	8%	4.0 h	4.0 h	650
Sep 5, 2023	No storm report	503	23%	1.2 h	1.2 h	622
May 15, 2019	Flooding	306	14%	2.0 h	2.0 h	602
May 13, 2017	No storm report	522	24%	1.2 h	48 min	543
Oct 14, 2021	No storm report	687	31%	48 min	48 min	515
May 30, 2022	No storm report	164	7%	3.2 h	3.2 h	483
Aug 28, 2024	No storm report	534	24%	48 min	48 min	398
Apr 25, 2018	No storm report	521	24%	48 min	48 min	388
Nov 30, 2019	Winter storm	173	8%	3.2 h	1.5 h	365
Jul 27, 2025	Thunderstorms	255	12%	1.2 h	48 min	315
Mar 15, 2025	Windstorm	272	12%	1.2 h	48 min	313
Jul 28, 2021	No storm report	160	7%	2.2 h	8.2 h	306
Feb 8, 2018	No storm report	305	14%	1.0 h	1.0 h	304
Oct 30, 2023	No storm report	220	10%	4.2 h	30 min	286
Apr 10, 2025	No storm report	221	10%	1.2 h	1.2 h	276
Apr 23, 2018	No storm report	517	24%	30 min	30 min	258
Nov 13, 2022	No storm report	315	14%	48 min	48 min	236
Jul 23, 2023	No storm report	78	4%	3.0 h	–	234
Dec 22, 2022	Winter storm	306	14%	48 min	48 min	230
Dec 16, 2022	Winter storm	306	14%	48 min	48 min	230
May 16, 2019	Flooding	217	10%	1.0 h	1.0 h	215

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.

When it happens

The outage clock

Customer-hours out by month (rings, January innermost) and local hour, 2018–2025.

What was happening

Weather behind the outages

Each outage is matched to NOAA storm reports for Edmunds from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.

No storm on record 63%
Ice storm 21%
Thunderstorms 5.9%
Winter storm 4.2%
Flooding 3.8%
Windstorm 1.7%

Who keeps the lights on

Utilities serving Edmunds

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
NorthWestern Energy	Investor Owned	120	82	1.14	13.3	52k
FEM Electric Assn, Inc	SD	87	87	1.20	12.1	39k
Montana-Dakota Utilities Co	Investor Owned	212	206	2.62	13.0	6.3k
Northern Electric Coop, Inc	Cooperative	73	65	0.74	11.4	5.8k
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

Brown 2.3 h
Edmunds (this county) – h

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 2,191 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 →