Power Out Map
– 0% of Sublette out 0 customers out in Wyoming

Power outage history

Sublette County Wyoming

4.3hours

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

5th most of 20 in Wyoming 34% below the national median

Worst outage on record Sep 11, 2018 100% of customers out · 90% back in 7.8 hours
Hours without power, average customer per year 4.3h / yr State average 2.4 h · national median 6.6 h
Major outages a year 3.4 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 2hours Median across major outages, from the peak
Longest single outage 6.9days Sep 23, 2018, over 1% of customers out
Outage hours on storm days 36% Share falling on days with a NOAA storm report here
Worst year 2018 9.6 hours without power, average customer
Electricity customers 5,123 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 Sublette'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

2018 was the worst well-recorded year, at 9.6 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Sublette, hours without power per customer

SubletteUS median countyWyoming average
0 2 4 6 8 10 12 2.2 ’17 9.6 ’18 3.0 ’19 2.0 ’20 3.0 ’21 1.3 ’22 2.5 ’23 7.8 ’24 5.3 ’25 US 6.6 WY 2.4

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 10, 2018 No storm report 5,123 100% 4.8 h 7.8 h 21k
Sep 23, 2018 Wildfire 106 2% 6.9 d – 11k
Jul 27, 2024 No storm report 1,878 37% 8.0 h 6.5 h 11k
Dec 27, 2025 Heat 572 11% 21 h 14 h 8.5k
Jun 11, 2024 No storm report 5,123 100% 1.5 h 2.5 h 7.7k
Dec 27, 2017 No storm report 856 17% 11 h 4.5 h 7.4k
May 15, 2021 No storm report 4,170 81% 1.2 h 2.0 h 5.2k
Mar 2, 2025 No storm report 561 11% 18 h 1.8 h 5.1k
Jun 11, 2024 No storm report 5,123 100% 1.0 h 11 h 5.1k
Jul 22, 2018 Flooding 858 17% 5.0 h 3.8 h 3.9k
Dec 17, 2025 Winter storm 142 3% 2.0 d – 3.6k
Dec 28, 2021 No storm report 991 19% 3.8 h 4.0 h 3.5k

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 +2h 90% by +4h

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

  • No storm on record 64%
  • Wildfire 11%
  • Winter storm 8.0%
  • Heat 5.6%
  • Thunderstorms 5.1%
  • Windstorm 3.2%
  • Flooding 2.5%
  • Tornadoes 0.5%

Who keeps the lights on

Utilities serving Sublette

As each utility reports to the Energy Information Administration for its whole Wyoming 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 195 91 1.37 15.1 119k
Lower Valley Energy Inc Cooperative – – – 7.0 23k

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 Wyoming

Where it is darkest

Hours / yr64+

All Wyoming 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 5,123 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 →