Power Out Map
– 0% of Ontonagon out 0 customers out in Michigan

Power outage history

Ontonagon County Michigan

6.4hours

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

70th most of 83 in Michigan close to the national median

Worst outage on record Nov 26, 2025 56% of customers out · 90% back in 42 hours
Hours without power, average customer per year 6.4h / yr State average 13 h · national median 6.6 h
Major outages a year 5.4 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 2.5days Nov 26, 2025, over 1% of customers out
Outage hours on storm days 51% Share falling on days with a NOAA storm report here
Worst year 2025 16 hours without power, average customer
Electricity customers 4,246 ORNL customer model · 8 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 Ontonagon'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 16 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Ontonagon, hours without power per customer

OntonagonUS median countyMichigan average
0 5 10 15 20 1.7 ’15 11 ’16 4.7 ’17 1.2 ’18 4.2 ’19 9.3 ’20 4.7 ’21 6.9 ’22 4.7 ’23 4.3 ’24 16 ’25 MI 13 US 6.6

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
Nov 26, 2025 Winter storm 2,384 56% 2.5 d 42 h 47k
Jul 21, 2016 Thunderstorms 1,818 43% 41 h 13 h 21k
Jul 19, 2020 Thunderstorms 4,246 100% 21 h 9.5 h 16k
Jul 26, 2021 No storm report 695 16% 19 h 10 h 12k
Feb 9, 2024 No storm report 1,294 30% 6.8 h 6.0 h 8.5k
Nov 19, 2016 Winter storm 2,150 51% 3.5 h 3.5 h 7.5k
Oct 17, 2022 Winter storm 1,074 25% 17 h 8.8 h 6.9k
Oct 28, 2017 Winter storm 637 15% 24 h 20 h 6.6k
Jul 14, 2020 No storm report 668 16% 8.8 h 13 h 5.8k
Dec 1, 2019 Winter storm 637 15% 8.8 h 30 min 5.5k
Oct 1, 2019 No storm report 1,015 24% 5.2 h 5.2 h 5.3k
Jul 27, 2023 Thunderstorms 1,885 44% 2.8 h 2.8 h 5.2k

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 +8h

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

  • No storm on record 49%
  • Winter storm 39%
  • Thunderstorms 12%

Who keeps the lights on

Utilities serving Ontonagon

As each utility reports to the Energy Information Administration for its whole Michigan territory, not this county alone. Outage minutes include major storm days.

Utility Type Outage min / yr Excl. major storms Outages / yr Residential ¢/kWh Customers
Upper Peninsula Power Company Investor Owned 446 190 2.20 28.0 48k
Upper Michigan Energy Resources Corp. Investor Owned 1,249 240 2.46 17.5 33k
Ontonagon County R E A MI 1,041 442 3.13 – 19k
Northern States Power Co Investor Owned 738 142 1.71 15.5 7.6k

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 Michigan

Where it is darkest

Hours / yr64+

All Michigan 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 4,246 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 →