Power outage history
Cass County Nebraska
8.5hours
without power for the average customer in a typical year, 2018–2025
6th most of 28 in Nebraska 1.3× 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 Cass's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2021 was the worst well-recorded year, at 22 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Cass, 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 16, 2017 | Thunderstorms | 9,415 | 76% | 4.9 d | 2.8 d | 267k |
| Dec 15, 2021 | Tornadoes | 6,971 | 56% | 2.3 d | 47 h | 119k |
| Jul 31, 2024 | Thunderstorms | 4,978 | 40% | 4.0 d | 12 min | 111k |
| Jul 10, 2021 | Thunderstorms | 4,184 | 34% | 2.7 d | 36 h | 95k |
| Jun 14, 2022 | Thunderstorms | 5,686 | 46% | 26 h | 13 h | 38k |
| Mar 19, 2025 | Winter storm | 1,982 | 16% | 31 h | 36 h | 29k |
| Jun 24, 2021 | Thunderstorms | 4,878 | 39% | 11 h | 10 h | 23k |
| Oct 11, 2020 | No storm report | 2,938 | 24% | 14 h | 7.5 h | 16k |
| Mar 20, 2025 | No storm report | 634 | 5% | 2.0 d | 34 h | 14k |
| Mar 4, 2025 | Winter storm | 1,112 | 9% | 20 h | 9.8 h | 14k |
| Aug 24, 2020 | No storm report | 879 | 7% | 30 h | 48 min | 12k |
| Jun 11, 2018 | Thunderstorms | 1,939 | 16% | 15 h | 1.8 h | 11k |
| Feb 2, 2016 | Winter storm | 3,718 | 30% | 7.2 h | 2.8 h | 11k |
| Jul 26, 2017 | No storm report | 1,986 | 16% | 5.0 h | 5.0 h | 9.2k |
| Jul 4, 2023 | Thunderstorms | 2,053 | 17% | 19 h | 30 min | 8.8k |
| Nov 29, 2022 | No storm report | 2,147 | 17% | 6.2 h | 5.2 h | 7.7k |
| Jun 29, 2023 | Thunderstorms | 2,077 | 17% | 4.5 h | 3.5 h | 7.6k |
| Jul 9, 2019 | No storm report | 2,588 | 21% | 3.5 h | 5.0 h | 6.4k |
| Oct 2, 2023 | No storm report | 1,435 | 12% | 4.2 h | 1.8 h | 5.9k |
| Mar 10, 2021 | No storm report | 1,223 | 10% | 8.5 h | 3.8 h | 5.5k |
| Sep 10, 2020 | No storm report | 2,185 | 18% | 2.8 h | 1.2 h | 5.5k |
| Sep 6, 2015 | Thunderstorms | 1,013 | 8% | 13 h | 9.8 h | 5.1k |
| Jun 26, 2024 | Flooding | 1,275 | 10% | 3.8 h | 2.8 h | 4.8k |
| May 30, 2022 | No storm report | 982 | 8% | 4.5 h | 48 min | 4.4k |
| Jun 29, 2024 | Flooding | 1,444 | 12% | 2.8 h | 6.5 h | 4.0k |
| Jul 12, 2023 | Thunderstorms | 1,377 | 11% | 3.5 h | 1.0 h | 3.8k |
| Mar 31, 2018 | No storm report | 1,087 | 9% | 4.5 h | 3.5 h | 3.7k |
| Mar 5, 2020 | No storm report | 941 | 8% | 4.0 h | 30 min | 3.5k |
| Nov 20, 2018 | No storm report | 1,194 | 10% | 3.8 h | 3.8 h | 3.3k |
| Dec 13, 2022 | No storm report | 784 | 6% | 5.5 h | 8.0 h | 3.2k |
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 Cass from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Thunderstorms 45%
- No storm on record 28%
- Tornadoes 17%
- Winter storm 6.9%
- Flooding 1.7%
- Windstorm 0.7%
Who keeps the lights on
Utilities serving Cass
As each utility reports to the Energy Information Administration for its whole Nebraska territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Omaha Public Power District | Political Subdivision | 558 | 98 | 1.57 | 13.3 | 369k |
| Nebraska Public Power District | Political Subdivision | 195 | 77 | 0.90 | 10.9 | 74k |
| Village of Greenwood | NE | – | – | – | – | 3.0k |
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
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 12,382 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 →