Power Out Map
– 0% of Summit out 0 customers out in Utah

Power outage history

Summit County Utah

8.4hours

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

4th most of 23 in Utah 1.3× the national median

Worst outage on record Mar 29, 2019 15% of customers out · 90% back in 28 hours
Hours without power, average customer per year 8.4h / yr State average 3.2 h · national median 6.6 h
Major outages a year 7.8 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 40hours Mar 29, 2019, over 1% of customers out
Outage hours on storm days 10% Share falling on days with a NOAA storm report here
Worst year 2025 15 hours without power, average customer
Electricity customers 18,106 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 Summit'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 15 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Summit, hours without power per customer

SummitUS median countyUtah average
0 5 10 15 20 3.8 ’17 5.0 ’18 8.0 ’19 9.4 ’20 6.1 ’21 6.7 ’22 9.1 ’23 8.0 ’24 15 ’25 US 6.6 UT 3.2

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
Mar 29, 2019 No storm report 2,646 15% 40 h 28 h 37k
Sep 24, 2017 No storm report 1,721 10% 26 h 25 h 18k
Sep 9, 2023 No storm report 2,497 14% 9.2 h 8.0 h 16k
Nov 6, 2020 No storm report 2,661 15% 11 h 12 h 16k
Jan 18, 2025 No storm report 2,801 15% 17 h 17 h 15k
Oct 11, 2020 No storm report 1,791 10% 11 h 3.8 h 15k
Sep 15, 2024 No storm report 3,145 17% 6.5 h 17 h 14k
Nov 14, 2020 No storm report 3,108 17% 9.2 h 30 min 13k
Dec 31, 2024 No storm report 2,731 15% 4.2 h 4.2 h 12k
Jul 10, 2025 No storm report 2,821 16% 4.2 h 2.0 h 11k
Oct 12, 2017 No storm report 1,749 10% 6.0 h 6.0 h 10k
Nov 15, 2023 No storm report 2,711 15% 9.5 h 6.2 h 10k

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

  • No storm on record 90%
  • Winter storm 7.9%
  • Thunderstorms 2.1%

Who keeps the lights on

Utilities serving Summit

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

Utility Type Outage min / yr Excl. major storms Outages / yr Residential ¢/kWh Customers
PacifiCorp Investor Owned 118 102 0.90 13.5 969k
Bridger Valley Elec Assn, Inc WY – – – 16.9 8.3k

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 Utah

Where it is darkest

Hours / yr64+

All Utah 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 18,106 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 →