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

Power outage history

Slope County North Dakota

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

Worst outage on record Aug 18, 2025 25% of customers out · lasted 2.8 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% 2hours Median across major outages, from the peak
Longest single outage 3hours Aug 18, 2025, over 1% of customers out
Outage hours on storm days 27% Share falling on days with a NOAA storm report here
Worst year –
Electricity customers 467 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 Slope'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

Slope, hours without power per customer

SlopeUS median countyNorth Dakota average
0 2 4 6 8 ’19 ’21 ’23 ’24 ’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
Aug 18, 2025 No storm report 115 25% 2.8 h – 312
Jul 13, 2024 Thunderstorms 117 25% 2.5 h 1.8 h 292
Jul 8, 2019 No storm report 115 25% 2.2 h 1.8 h 256
Sep 28, 2021 No storm report 109 23% 48 min – 80
Feb 15, 2024 No storm report 27 6% 2.5 h 2.5 h 68
Feb 20, 2024 No storm report 25 5% 1.2 h 1.2 h 31
Sep 11, 2019 No storm report 114 24% 12 min – 28

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

  • No storm on record 73%
  • Thunderstorms 27%

Who keeps the lights on

Utilities serving Slope

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
Montana-Dakota Utilities Co Investor Owned 95 65 0.81 11.1 80k
Roughrider Electric Cooperativ Cooperative – – – 10.8 11k
Goldenwest Electric Coop, Inc MT – – – – 7.2k
Slope Electric Coop Inc Cooperative – – – 14.3 3.2k
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

  • Stark 0.5 h
  • Slope (this county) – h

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 467 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 →