Power Out Map
– 0% of Salt Lake out 0 customers out in Utah

Power outage history

Salt Lake County Utah

3.6hours

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

11th most of 23 in Utah 46% below the national median

Worst outage on record Sep 8, 2020 19% of customers out · 90% back in 4.2 days
Hours without power, average customer per year 3.6h / yr State average 3.2 h · national median 6.6 h
Major outages a year 0.1 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 4.2days Median across major outages, from the peak
Longest single outage 5.5days Sep 8, 2020, over 1% of customers out
Outage hours on storm days 5% Share falling on days with a NOAA storm report here
Worst year 2020 12 hours without power, average customer
Electricity customers 494,047 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 Salt Lake'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

2020 was the worst well-recorded year, at 12 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Salt Lake, hours without power per customer

Salt LakeUS median countyUtah average
0 5 10 15 0.7 ’17 2.2 ’18 2.5 ’19 12 ’20 2.4 ’21 2.3 ’22 2.3 ’23 2.3 ’24 2.6 ’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
Sep 8, 2020 No storm report 91,704 19% 5.5 d 4.2 d 4.6M
Mar 29, 2019 No storm report 15,482 3% 25 h 31 h 243k
Mar 18, 2020 No storm report 26,945 5% 7.8 h 6.2 h 99k
Mar 6, 2022 Winter storm 13,708 3% 15 h 14 h 92k
Aug 19, 2018 No storm report 15,246 3% 5.8 h 4.2 h 83k
Jan 1, 2023 Winter storm 11,396 2% 10 h 21 h 66k
Jun 28, 2020 No storm report 13,565 3% 4.0 h 2.8 h 47k
Mar 10, 2023 Winter storm 15,397 3% 2.5 h 3.5 h 36k
Nov 7, 2022 No storm report 15,681 3% 3.8 h 1.8 h 33k
May 12, 2025 No storm report 13,259 3% 4.8 h 6.2 h 30k
Jul 22, 2021 Thunderstorms 8,366 2% 3.8 h 14 h 27k
Nov 21, 2017 No storm report 10,321 2% 3.2 h 3.2 h 23k

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 +32h

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

  • No storm on record 95%
  • Winter storm 4.4%
  • Thunderstorms 0.6%

Who keeps the lights on

Utilities serving Salt Lake

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
City of Murray Municipal 54 – 0.90 12.4 18k
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

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 494,047 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 →