Power Out Map
– 0% of Denali out 0 customers out in Alaska

Power outage history

Denali Borough Alaska

21hours

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

1st most of 6 in Alaska 3.2× the national median

Worst outage on record Dec 26, 2021 100% of customers out · 90% back in 14 hours
Hours without power, average customer per year 21h / yr State average 7.4 h · national median 6.6 h
Major outages a year 20.4 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 2.3days Jun 30, 2024, over 1% of customers out
Outage hours on storm days 4% Share falling on days with a NOAA storm report here
Worst year 2025 41 hours without power, average customer
Electricity customers 1,014 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 Denali'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 41 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Denali, hours without power per customer

DenaliUS median countyAlaska average
0 10 20 30 40 50 ’16 ’17 14 ’18 19 ’19 19 ’20 23 ’21 25 ’22 9.8 ’23 18 ’24 41 ’25 AK 7.4 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
Dec 26, 2021 No storm report 1,014 100% 26 h 14 h 14k
Jan 1, 2022 No storm report 252 25% 36 h 42 h 8.2k
Jun 30, 2024 No storm report 128 13% 2.3 d 2.8 d 7.2k
Aug 21, 2019 No storm report 801 79% 6.2 h 6.2 h 5.0k
Aug 6, 2018 No storm report 795 78% 5.0 h 5.0 h 4.0k
Jun 4, 2020 No storm report 1,014 100% 3.8 h 3.0 h 3.2k
Jan 27, 2025 No storm report 386 38% 9.2 h 8.0 h 3.0k
Jun 18, 2025 No storm report 859 85% 3.2 h 3.2 h 2.8k
Jul 25, 2022 No storm report 309 30% 8.2 h 8.2 h 2.5k
Oct 1, 2025 No storm report 441 43% 5.8 h 5.8 h 2.5k
Jan 25, 2025 No storm report 385 38% 6.5 h 6.5 h 2.5k
Jun 1, 2020 No storm report 756 75% 3.5 h 3.2 h 2.5k

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 +8h 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 Denali from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.

  • No storm on record 96%
  • Windstorm 2.7%
  • Winter storm 1.4%

Who keeps the lights on

Utilities serving Denali

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

Utility Type Outage min / yr Excl. major storms Outages / yr Residential ¢/kWh Customers
Golden Valley Elec Assn Inc Cooperative 212 212 1.96 31.5 41k

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 Alaska

Where it is darkest

Hours / yr64+

All Alaska 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 1,014 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 →