Power outage history
Sumner County Kansas
1.9hours
without power for the average customer in a typical year, 2018–2025
65th most of 81 in Kansas 71% 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 Sumner'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 3.6 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Sumner, 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 12, 2021 | No storm report | 347 | 4% | 42 h | – | 14k |
| Jun 9, 2024 | Thunderstorms | 1,200 | 14% | 18 h | 17 h | 9.5k |
| Jun 17, 2025 | Thunderstorms | 470 | 5% | 32 h | 34 h | 6.5k |
| Jun 7, 2025 | Thunderstorms | 415 | 5% | 13 h | – | 4.2k |
| Jul 11, 2016 | No storm report | 1,116 | 13% | 3.0 h | 3.0 h | 3.3k |
| Jul 19, 2024 | No storm report | 317 | 4% | 8.2 h | – | 2.6k |
| Dec 23, 2016 | No storm report | 1,097 | 13% | 2.2 h | 2.2 h | 2.5k |
| Mar 13, 2024 | No storm report | 1,145 | 13% | 3.2 h | 3.2 h | 2.3k |
| Jun 21, 2025 | No storm report | 838 | 10% | 3.0 h | 3.0 h | 2.3k |
| Aug 5, 2017 | No storm report | 129 | 1% | 20 h | – | 2.3k |
| Aug 5, 2023 | Thunderstorms | 413 | 5% | 7.2 h | – | 2.1k |
| Jun 28, 2023 | No storm report | 1,041 | 12% | 2.0 h | 2.0 h | 2.1k |
| Nov 24, 2020 | Thunderstorms | 467 | 5% | 15 h | 15 h | 2.0k |
| May 2, 2025 | No storm report | 806 | 9% | 2.5 h | 5.2 h | 2.0k |
| Jun 15, 2019 | Thunderstorms | 298 | 3% | 8.8 h | – | 1.9k |
| Sep 16, 2021 | No storm report | 962 | 11% | 2.0 h | 1.5 h | 1.9k |
| May 7, 2019 | Thunderstorms | 1,097 | 13% | 3.5 h | 3.0 h | 1.9k |
| Oct 30, 2021 | No storm report | 700 | 8% | 3.0 h | 2.8 h | 1.8k |
| Aug 19, 2016 | Thunderstorms | 128 | 1% | 16 h | – | 1.8k |
| Jun 10, 2022 | Thunderstorms | 1,036 | 12% | 1.8 h | 1.8 h | 1.8k |
| May 18, 2022 | No storm report | 262 | 3% | 7.0 h | – | 1.8k |
| May 31, 2022 | Thunderstorms | 181 | 2% | 13 h | – | 1.5k |
| Jul 2, 2024 | No storm report | 345 | 4% | 5.0 h | – | 1.4k |
| Jul 21, 2021 | No storm report | 796 | 9% | 1.8 h | 1.8 h | 1.4k |
| Jun 22, 2021 | No storm report | 792 | 9% | 2.2 h | 1.8 h | 1.2k |
| Dec 15, 2022 | No storm report | 1,127 | 13% | 1.0 h | 1.0 h | 1.1k |
| May 9, 2016 | Thunderstorms | 1,109 | 13% | 1.5 h | 1.5 h | 1.1k |
| May 24, 2019 | No storm report | 370 | 4% | 6.2 h | – | 1.1k |
| Jun 11, 2015 | No storm report | 1,109 | 13% | 1.5 h | 6.5 h | 932 |
| Apr 22, 2021 | No storm report | 1,713 | 20% | 30 min | 30 min | 856 |
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 Sumner from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- No storm on record 63%
- Thunderstorms 36%
- Winter storm 0.8%
Who keeps the lights on
Utilities serving Sumner
As each utility reports to the Energy Information Administration for its whole Kansas territory, not this county alone. Outage minutes include major storm days.
| Utility | Type | Outage min / yr | Excl. major storms | Outages / yr | Residential ¢/kWh | Customers |
|---|---|---|---|---|---|---|
| Evergy Kansas South, Inc | Investor Owned | 244 | 84 | 1.39 | 14.5 | 306k |
| Sedgwick County El Coop Assn Inc | KS | 207 | 207 | 1.69 | 13.5 | 91k |
| Sumner-Cowley Elec Coop, Inc | KS | – | – | – | 15.7 | 49k |
| City of Wellington | KS | – | – | – | 16.6 | 35k |
| City of Mulvane | KS | – | – | – | 13.2 | 24k |
| City of Oxford | KS | – | – | – | – | 4.8k |
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 8,773 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 →