Power Out Map
– 0% of Cheyenne out 0 customers out in Colorado

Power outage history

Cheyenne County Colorado

14hours

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

4th most of 39 in Colorado 2.1× the national median

Worst outage on record Mar 14, 2019 20% of customers out · 90% back in 5.9 days
Hours without power, average customer per year 14h / yr State average 3.0 h · national median 6.6 h
Major outages a year 8.3 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 5.9days Mar 14, 2019, over 1% of customers out
Outage hours on storm days 60% Share falling on days with a NOAA storm report here
Worst year 2019 47 hours without power, average customer
Electricity customers 1,412 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 Cheyenne'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

2019 was the worst well-recorded year, at 47 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Cheyenne, hours without power per customer

CheyenneUS median countyColorado average
0 20 40 60 7.8 ’17 5.7 ’18 47 ’19 9.3 ’20 6.4 ’21 8.7 ’22 5.6 ’23 11 ’24 17 ’25 US 6.6 CO 3.0

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 14, 2019 Windstorm 289 20% 5.9 d 5.9 d 41k
Dec 28, 2019 No storm report 1,370 97% 12 h 11 h 5.5k
Mar 18, 2025 Winter storm 427 30% 14 h 7.0 h 4.4k
Dec 29, 2019 Windstorm 1,387 98% 9.2 h 8.5 h 4.3k
Jul 29, 2019 Thunderstorms 981 69% 6.5 h 2.0 h 3.7k
Jul 9, 2017 No storm report 86 6% 33 h 33 h 2.8k
Aug 22, 2024 Thunderstorms 1,376 97% 2.0 h 1.8 h 2.8k
Sep 29, 2020 No storm report 1,391 99% 2.0 h 2.0 h 2.4k
Jun 27, 2025 No storm report 1,375 97% 2.0 h 1.8 h 2.0k
Jun 29, 2025 Thunderstorms 851 60% 2.2 h 1.5 h 1.9k
Jul 26, 2023 No storm report 430 30% 4.0 h 8.2 h 1.7k
Sep 15, 2024 No storm report 831 59% 2.2 h 2.0 h 1.7k

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 +6h

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

  • Windstorm 40%
  • No storm on record 40%
  • Thunderstorms 11%
  • Winter storm 7.1%
  • Tornadoes 1.1%
  • Ice storm 0.5%

Who keeps the lights on

Utilities serving Cheyenne

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

Utility Type Outage min / yr Excl. major storms Outages / yr Residential ¢/kWh Customers
Southeast Colorado Power Assn Cooperative 1,290 1,280 – 17.9 8.2k
K C Electric Association Cooperative – – – 13.0 3.4k
Wheatland Electric Coop, Inc Cooperative – – – 20.3 29

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 Colorado

Where it is darkest

Hours / yr64+

All Colorado 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 1,412 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 →