Power outage history
Natrona County Wyoming
1.6hours
without power for the average customer in a typical year, 2018–2025
13th most of 20 in Wyoming 75% below the national median
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 Natrona's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2025 was the worst well-recorded year, at 2.2 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Natrona, hours without power per customer
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 |
|---|---|---|---|---|---|---|
| Jun 27, 2020 | No storm report | 12,288 | 26% | 4.0 h | 4.0 h | 41k |
| Mar 20, 2023 | No storm report | 11,854 | 25% | 4.0 h | 1.2 h | 40k |
| Jul 28, 2025 | Wildfire | 7,603 | 16% | 3.8 h | 1.8 h | 22k |
| Dec 21, 2022 | Winter storm | 4,501 | 9% | 7.5 h | 48 min | 21k |
| Jun 16, 2023 | Flooding | 7,538 | 16% | 2.0 h | 2.8 h | 15k |
| Apr 2, 2021 | No storm report | 7,526 | 16% | 2.0 h | 30 min | 14k |
| Nov 13, 2025 | No storm report | 19,727 | 41% | 9.2 h | 12 min | 13k |
| Dec 27, 2022 | Windstorm | 3,787 | 8% | 3.2 h | 1.5 h | 12k |
| Sep 7, 2020 | Winter storm | 2,728 | 6% | 4.2 h | 4.0 h | 8.5k |
| Aug 20, 2025 | Wildfire | 2,691 | 6% | 3.8 h | 1.5 h | 8.4k |
| Mar 14, 2021 | Winter storm | 994 | 2% | 12 h | – | 8.0k |
| Nov 27, 2022 | Windstorm | 2,101 | 4% | 3.8 h | – | 7.3k |
| May 29, 2025 | No storm report | 4,636 | 10% | 1.5 h | 1.5 h | 7.0k |
| Sep 8, 2020 | Winter storm | 1,693 | 4% | 5.5 h | – | 5.6k |
| Jul 12, 2023 | No storm report | 2,201 | 5% | 3.5 h | – | 5.3k |
| Jul 30, 2019 | No storm report | 2,260 | 5% | 4.5 h | – | 5.2k |
| Oct 17, 2018 | No storm report | 2,694 | 6% | 2.0 h | 1.5 h | 4.8k |
| Nov 21, 2023 | No storm report | 4,308 | 9% | 2.2 h | 30 min | 4.3k |
| Jul 23, 2024 | No storm report | 2,714 | 6% | 1.5 h | 48 min | 4.0k |
| Jun 30, 2024 | Thunderstorms | 523 | 1% | 7.8 h | – | 3.9k |
| Mar 9, 2021 | Winter storm | 2,494 | 5% | 1.5 h | 48 min | 3.7k |
| Oct 27, 2020 | No storm report | 553 | 1% | 6.5 h | – | 3.6k |
| Dec 16, 2025 | Heat | 4,112 | 9% | 2.2 h | 1.8 h | 3.6k |
| Aug 7, 2021 | No storm report | 722 | 2% | 4.5 h | – | 3.2k |
| Jul 15, 2025 | No storm report | 1,509 | 3% | 3.0 h | – | 3.2k |
| Dec 19, 2025 | Windstorm | 1,713 | 4% | 2.0 h | – | 3.2k |
| Jun 27, 2024 | No storm report | 1,276 | 3% | 2.5 h | – | 3.2k |
| Aug 24, 2025 | Wildfire | 2,535 | 5% | 1.2 h | 1.0 h | 3.2k |
| Sep 8, 2019 | No storm report | 925 | 2% | 4.2 h | – | 3.1k |
| Jul 23, 2024 | No storm report | 3,041 | 6% | 1.0 h | 30 min | 3.0k |
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.
When it happens
The outage clock
Customer-hours out by month (rings, January innermost) and local hour, 2018–2025.
What was happening
Weather behind the outages
Each outage is matched to NOAA storm reports for Natrona from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 61%
- Winter storm 14%
- Wildfire 10%
- Windstorm 6.5%
- Flooding 4.3%
- Heat 2.4%
- Thunderstorms 1.4%
Who keeps the lights on
Utilities serving Natrona
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 |
| High Plains Power Inc | Cooperative | 320 | 263 | – | 14.2 | 13k |
| 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.
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 47,992 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 →