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

Power outage history

Mason County Michigan

11hours

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

55th most of 83 in Michigan 1.6× the national median

Worst outage on record Aug 11, 2021 59% of customers out · 90% back in 38 hours
Hours without power, average customer per year 11h / yr State average 13 h · national median 6.6 h
Major outages a year 3.0 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 9hours Median across major outages, from the peak
Longest single outage 4.1days Aug 10, 2021, over 1% of customers out
Outage hours on storm days 64% Share falling on days with a NOAA storm report here
Worst year 2021 23 hours without power, average customer
Electricity customers 18,909 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 Mason'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

2021 was the worst well-recorded year, at 23 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Mason, hours without power per customer

MasonUS median countyMichigan average
0 10 20 30 2.7 ’15 2.2 ’16 3.8 ’17 16 ’18 16 ’19 6.1 ’20 23 ’21 5.7 ’22 4.8 ’23 5.2 ’24 8.8 ’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
Aug 10, 2021 Thunderstorms 11,073 59% 4.1 d 38 h 270k
Aug 28, 2018 Thunderstorms 7,525 40% 2.9 d 36 h 258k
Dec 1, 2019 Winter storm 4,249 22% 2.4 d 43 h 117k
Dec 15, 2021 Windstorm 4,118 22% 45 h 31 h 59k
Dec 29, 2025 Winter storm 3,857 20% 39 h 24 h 48k
Jun 1, 2019 No storm report 5,195 27% 26 h 17 h 45k
Jul 20, 2019 Thunderstorms 2,457 13% 37 h 35 h 44k
Nov 5, 2022 No storm report 1,775 9% 36 h 32 h 44k
Jul 27, 2023 No storm report 6,240 33% 8.8 h 7.5 h 35k
Jun 3, 2020 Thunderstorms 2,797 15% 20 h 17 h 33k
Nov 26, 2025 Winter storm 2,398 13% 28 h 21 h 31k
Apr 20, 2017 Thunderstorms 9,079 48% 6.8 h 1.8 h 26k

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 +10h 90% by +26h

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

  • Thunderstorms 44%
  • No storm on record 36%
  • Winter storm 14%
  • Windstorm 4.2%
  • Tropical storm 0.9%

Who keeps the lights on

Utilities serving Mason

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
Consumers Energy Co Investor Owned 820 164 1.40 20.7 1.7M
Great Lakes Energy Coop Cooperative 4,401 315 4.09 20.3 123k
Wolverine Power Supply Coop Cooperative – – – – –

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 18,909 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 →