Power outage history
Johnson County Kansas
3.3hours
without power for the average customer in a typical year, 2018–2025
45th most of 81 in Kansas 49% 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 Johnson's customers who were without power at that day's worst moment.
Year by year
Hours in the dark, per customer
2023 was the worst well-recorded year, at 7.8 hours for the average customer. Hatched years have a thin record and are left out of the averages.
Johnson, 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 |
|---|---|---|---|---|---|---|
| Jul 14, 2023 | Thunderstorms | 64,696 | 22% | 3.2 d | 2.8 d | 1.8M |
| Jul 22, 2017 | Thunderstorms | 48,945 | 17% | 2.6 d | 2.1 d | 1.2M |
| Jan 12, 2019 | Winter storm | 26,850 | 9% | 3.2 d | 3.1 d | 1.1M |
| May 25, 2024 | Thunderstorms | 39,563 | 13% | 43 h | 42 h | 618k |
| Jun 17, 2017 | Thunderstorms | 17,011 | 6% | 40 h | 43 h | 279k |
| Jul 30, 2023 | Thunderstorms | 20,814 | 7% | 21 h | 22 h | 162k |
| Jun 2, 2018 | Thunderstorms | 23,749 | 8% | 14 h | 13 h | 152k |
| May 19, 2024 | Tornadoes | 24,659 | 8% | 14 h | 14 h | 142k |
| Jun 26, 2015 | Thunderstorms | 9,713 | 3% | 27 h | 36 h | 135k |
| Jun 17, 2017 | Thunderstorms | 12,366 | 4% | 14 h | 25 h | 89k |
| Jun 8, 2022 | Tornadoes | 8,186 | 3% | 14 h | 24 h | 77k |
| Jul 17, 2025 | Thunderstorms | 13,987 | 5% | 8.8 h | 13 h | 72k |
| Jul 7, 2016 | Thunderstorms | 13,325 | 4% | 10 h | 13 h | 69k |
| Dec 15, 2021 | Thunderstorms | 13,378 | 5% | 11 h | 21 h | 65k |
| Mar 5, 2025 | No storm report | 12,718 | 4% | 11 h | 12 h | 63k |
| Feb 16, 2021 | Winter storm | 24,734 | 8% | 6.8 h | 5.0 h | 61k |
| Jan 9, 2024 | No storm report | 8,915 | 3% | 12 h | 13 h | 60k |
| May 19, 2025 | Thunderstorms | 16,245 | 5% | 5.8 h | 17 h | 51k |
| Aug 12, 2021 | Thunderstorms | 8,269 | 3% | 8.0 h | 13 h | 45k |
| Jul 31, 2024 | Thunderstorms | 8,952 | 3% | 6.5 h | 15 h | 39k |
| Jun 21, 2019 | Thunderstorms | 7,037 | 2% | 7.5 h | 14 h | 36k |
| May 26, 2016 | Thunderstorms | 7,609 | 3% | 6.2 h | 16 h | 32k |
| Aug 20, 2021 | Thunderstorms | 5,588 | 2% | 5.5 h | 15 h | 27k |
| Jul 15, 2015 | Thunderstorms | 10,464 | 4% | 4.2 h | 4.5 h | 27k |
| Jun 21, 2022 | Thunderstorms | 10,210 | 3% | 4.5 h | 9.0 h | 27k |
| May 20, 2025 | Thunderstorms | 5,094 | 2% | 8.8 h | 14 h | 26k |
| Jun 10, 2021 | No storm report | 12,438 | 4% | 2.8 h | 3.0 h | 22k |
| May 18, 2017 | Thunderstorms | 6,735 | 2% | 3.8 h | 7.8 h | 21k |
| Mar 6, 2017 | Thunderstorms | 7,376 | 2% | 3.2 h | 8.0 h | 19k |
| Feb 9, 2023 | No storm report | 5,902 | 2% | 3.8 h | 5.0 h | 18k |
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 Johnson from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.
- Thunderstorms 65%
- Winter storm 23%
- No storm on record 8.4%
- Tornadoes 4.4%
Who keeps the lights on
Utilities serving Johnson
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 Central, Inc | Investor Owned | 126 | 80 | 1.17 | 14.6 | 344k |
| Evergy Metro | Investor Owned | 129 | 64 | 1.02 | 13.2 | 247k |
| City of Gardner | KS | – | – | – | 10.0 | 88k |
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
- Jackson, MO 8.0 h
- Cass, MO 6.0 h
- Wyandotte 4.8 h
- Miami 3.6 h
- Johnson (this county) 3.3 h
- Franklin 2.6 h
- Leavenworth 2.5 h
- Douglas 2.3 h
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 296,663 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 →